zoneminder/src/zm_monitor.cpp

//
// ZoneMinder Monitor Class Implementation, $Date$, $Revision$
// Copyright (C) 2001-2008 Philip Coombes
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//

#include "zm_monitor.h"

#include "zm_group.h"
#include "zm_eventstream.h"
#include "zm_fifo.h"
#include "zm_file_camera.h"
#include "zm_remote_camera.h"
#include "zm_remote_camera_http.h"
#include "zm_remote_camera_nvsocket.h"
#include "zm_signal.h"
#include "zm_time.h"
#include "zm_utils.h"
#include "zm_zone.h"

#if ZM_HAS_V4L
#include "zm_local_camera.h"
#endif // ZM_HAS_V4L

#if HAVE_LIBAVFORMAT
#include "zm_remote_camera_rtsp.h"
#endif // HAVE_LIBAVFORMAT

#if HAVE_LIBAVFORMAT
#include "zm_ffmpeg_camera.h"
#endif // HAVE_LIBAVFORMAT

#if HAVE_LIBVLC
#include "zm_libvlc_camera.h"
#endif // HAVE_LIBVLC

#if HAVE_LIBCURL
#include "zm_curl_camera.h"
#endif // HAVE_LIBCURL

#if HAVE_LIBVNC
#include "zm_libvnc_camera.h"
#endif // HAVE_LIBVNC

#include <algorithm>
#include <sys/types.h>
#include <sys/stat.h>

#if ZM_MEM_MAPPED
#include <sys/mman.h>
#include <fcntl.h>
#else // ZM_MEM_MAPPED
#include <sys/ipc.h>
#include <sys/shm.h>
#endif // ZM_MEM_MAPPED

// SOLARIS - we don't have MAP_LOCKED on openSolaris/illumos
#ifndef MAP_LOCKED
#define MAP_LOCKED 0
#endif

// This is the official SQL (and ordering of the fields) to load a Monitor.
// It will be used whereever a Monitor dbrow is needed. WHERE conditions can be appended
std::string load_monitor_sql =
"SELECT `Id`, `Name`, `ServerId`, `StorageId`, `Type`, `Function`+0, `Enabled`, `DecodingEnabled`, "
"`LinkedMonitors`, `AnalysisFPSLimit`, `AnalysisUpdateDelay`, `MaxFPS`, `AlarmMaxFPS`,"
"`Device`, `Channel`, `Format`, `V4LMultiBuffer`, `V4LCapturesPerFrame`, " // V4L Settings
"`Protocol`, `Method`, `Options`, `User`, `Pass`, `Host`, `Port`, `Path`, `Width`, `Height`, `Colours`, `Palette`, `Orientation`+0, `Deinterlacing`, "
"`DecoderHWAccelName`, `DecoderHWAccelDevice`, `RTSPDescribe`, "
"`SaveJPEGs`, `VideoWriter`, `EncoderParameters`, "
"`OutputCodec`, `Encoder`, `OutputContainer`, "
"`RecordAudio`, "
"`Brightness`, `Contrast`, `Hue`, `Colour`, "
"`EventPrefix`, `LabelFormat`, `LabelX`, `LabelY`, `LabelSize`,"
"`ImageBufferCount`, `WarmupCount`, `PreEventCount`, `PostEventCount`, `StreamReplayBuffer`, `AlarmFrameCount`, "
"`SectionLength`, `MinSectionLength`, `FrameSkip`, `MotionFrameSkip`, "
"`FPSReportInterval`, `RefBlendPerc`, `AlarmRefBlendPerc`, `TrackMotion`, `Exif`,"
"`RTSPServer`, `RTSPStreamName`,"
"`SignalCheckPoints`, `SignalCheckColour` FROM `Monitors`";

std::string CameraType_Strings[] = {
  "Local",
  "Remote",
  "File",
  "Ffmpeg",
  "LibVLC",
  "NVSOCKET",
  "CURL",
  "VNC",
};

Monitor::MonitorLink::MonitorLink(unsigned int p_id, const char *p_name) :
  id(p_id),
  shared_data(nullptr),
  trigger_data(nullptr),
  video_store_data(nullptr)
{
  strncpy(name, p_name, sizeof(name)-1);

#if ZM_MEM_MAPPED
  map_fd = -1;
  snprintf(mem_file, sizeof(mem_file), "%s/zm.mmap.%d", staticConfig.PATH_MAP.c_str(), id);
#else // ZM_MEM_MAPPED
  shm_id = 0;
#endif // ZM_MEM_MAPPED
  mem_size = 0;
  mem_ptr = nullptr;

  last_event_id = 0;
  last_state = IDLE;

  last_connect_time = 0;
  connected = false;
}

Monitor::MonitorLink::~MonitorLink() {
  disconnect();
}

bool Monitor::MonitorLink::connect() {
  if ( !last_connect_time || (time(nullptr) - last_connect_time) > 60 ) {
    last_connect_time = time(nullptr);

    mem_size = sizeof(SharedData) + sizeof(TriggerData);

    Debug(1, "link.mem.size=%d", mem_size);
#if ZM_MEM_MAPPED
    map_fd = open(mem_file, O_RDWR, (mode_t)0600);
    if ( map_fd < 0 ) {
      Debug(3, "Can't open linked memory map file %s: %s", mem_file, strerror(errno));
      disconnect();
      return false;
    }
    while ( map_fd <= 2 ) {
      int new_map_fd = dup(map_fd);
      Warning("Got one of the stdio fds for our mmap handle. map_fd was %d, new one is %d", map_fd, new_map_fd);
      close(map_fd);
      map_fd = new_map_fd;
    }

    struct stat map_stat;
    if ( fstat(map_fd, &map_stat) < 0 ) {
      Error("Can't stat linked memory map file %s: %s", mem_file, strerror(errno));
      disconnect();
      return false;
    }

    if ( map_stat.st_size == 0 ) {
      Error("Linked memory map file %s is empty: %s", mem_file, strerror(errno));
      disconnect();
      return false;
    } else if ( map_stat.st_size < mem_size ) {
      Error("Got unexpected memory map file size %ld, expected %d", map_stat.st_size, mem_size);
      disconnect();
      return false;
    }

    mem_ptr = (unsigned char *)mmap(nullptr, mem_size, PROT_READ|PROT_WRITE, MAP_SHARED, map_fd, 0);
    if ( mem_ptr == MAP_FAILED ) {
      Error("Can't map file %s (%d bytes) to memory: %s", mem_file, mem_size, strerror(errno));
      disconnect();
      return false;
    }
#else // ZM_MEM_MAPPED
    shm_id = shmget((config.shm_key&0xffff0000)|id, mem_size, 0700);
    if ( shm_id < 0 ) {
      Debug(3, "Can't shmget link memory: %s", strerror(errno));
      connected = false;
      return false;
    }
    mem_ptr = (unsigned char *)shmat(shm_id, 0, 0);
    if ( mem_ptr < (void *)0 ) {
      Debug(3, "Can't shmat link memory: %s", strerror(errno));
      connected = false;
      return false;
    }
#endif // ZM_MEM_MAPPED

    shared_data = (SharedData *)mem_ptr;
    trigger_data = (TriggerData *)((char *)shared_data + sizeof(SharedData));

    if ( !shared_data->valid ) {
      Debug(3, "Linked memory not initialised by capture daemon");
      disconnect();
      return false;
    }

    last_state = shared_data->state;
    last_event_id = shared_data->last_event_id;
    connected = true;

    return true;
  }
  return false;
} // end bool Monitor::MonitorLink::connect()

bool Monitor::MonitorLink::disconnect() {
  if ( connected ) {
    connected = false;

#if ZM_MEM_MAPPED
    if ( mem_ptr > (void *)0 ) {
      msync( mem_ptr, mem_size, MS_ASYNC );
      munmap( mem_ptr, mem_size );
    }
    if ( map_fd >= 0 )
      close( map_fd );

    map_fd = -1;
#else // ZM_MEM_MAPPED
    struct shmid_ds shm_data;
    if ( shmctl( shm_id, IPC_STAT, &shm_data ) < 0 ) {
      Debug( 3, "Can't shmctl: %s", strerror(errno) );
      return( false );
    }

    shm_id = 0;

    if (shm_data.shm_nattch <= 1) {
      if (shmctl(shm_id, IPC_RMID, 0) < 0) {
        Debug(3, "Can't shmctl: %s", strerror(errno));
        return false;
      }
    }

    if (shmdt(mem_ptr) < 0) {
      Debug(3, "Can't shmdt: %s", strerror(errno));
      return false;
    }

#endif // ZM_MEM_MAPPED
    mem_size = 0;
    mem_ptr = nullptr;
  }
  return true;
}

bool Monitor::MonitorLink::isAlarmed() {
  if (!connected) {
    return false;
  }
  return( shared_data->state == ALARM );
}

bool Monitor::MonitorLink::inAlarm() {
  if (!connected) {
    return false;
  }
  return( shared_data->state == ALARM || shared_data->state == ALERT );
}

bool Monitor::MonitorLink::hasAlarmed() {
  if (shared_data->state == ALARM) {
    return true;
  }
  last_event_id = shared_data->last_event_id;
  return false;
}

Monitor::Monitor() 
 : id(0),
  name(""),
  server_id(0),
  storage_id(0),
  type(LOCAL),
  function(NONE),
  enabled(0),
  decoding_enabled(0),
  //protocol
  //method
  //options
  //host
  //port
  //user
  //pass
  //path
  //device 
  palette(0),
  channel(0),
  format(0),

  width(0),
  height(0),
  //v4l_multi_buffer
  //v4l_captures_per_frame
  orientation(ROTATE_0),
  deinterlacing(0),
  deinterlacing_value(0),
  decoder_hwaccel_name(""),
  decoder_hwaccel_device(""),
  videoRecording(0),
  rtsp_describe(0),

  savejpegs(0),
  colours(0),
  videowriter(DISABLED),
  encoderparams(""),
  output_codec(0),
  encoder(""),
  output_container(""),
  imagePixFormat(AV_PIX_FMT_NONE),
  subpixelorder(0),
  record_audio(0),
//event_prefix
//label_format
  label_coord(Coord(0,0)),
  label_size(0),
  image_buffer_count(0),
  warmup_count(0),
  pre_event_count(0),
  post_event_count(0),
  stream_replay_buffer(0),
  section_length(0),
  min_section_length(0),
  adaptive_skip(false),
  frame_skip(0),
  motion_frame_skip(0),
  analysis_fps_limit(0),
  analysis_update_delay(0),
  capture_delay(0),
  alarm_capture_delay(0),
  alarm_frame_count(0),
  alert_to_alarm_frame_count(0),
  fps_report_interval(0),
  ref_blend_perc(0),
  alarm_ref_blend_perc(0),
  track_motion(0),
  signal_check_points(0),
  signal_check_colour(0),
  embed_exif(0),
  rtsp_server(0),
  rtsp_streamname(""),
  capture_max_fps(0),
  purpose(QUERY),
  last_camera_bytes(0),
  event_count(0),
  image_count(0),
  last_capture_image_count(0),
  analysis_image_count(0),
  motion_frame_count(0),
  last_motion_frame_count(0),
  ready_count(0),
  first_alarm_count(0),
  last_alarm_count(0),
  last_signal(false),
  last_section_mod(0),
  buffer_count(0),
  state(IDLE),
  start_time(0),
  last_fps_time(0),
  last_analysis_fps_time(0),
  auto_resume_time(0),
  last_motion_score(0),
  event_close_mode(CLOSE_IDLE),
#if ZM_MEM_MAPPED
  map_fd(-1),
  mem_file(""),
#else // ZM_MEM_MAPPED
  shm_id(-1),
#endif // ZM_MEM_MAPPED
  mem_size(0),
  mem_ptr(nullptr),
  shared_data(nullptr),
  trigger_data(nullptr),
  video_store_data(nullptr),
  shared_timestamps(nullptr),
  shared_images(nullptr),
  video_fifo(nullptr),
  audio_fifo(nullptr),
  camera(nullptr),
  event(nullptr),
  storage(nullptr),
  videoStore(nullptr),
  analysis_it(nullptr),
  n_zones(0),
  zones(nullptr),
  privacy_bitmask(nullptr),
  n_linked_monitors(0),
  linked_monitors(nullptr)
{

  if ( strcmp(config.event_close_mode, "time") == 0 )
    event_close_mode = CLOSE_TIME;
  else if ( strcmp(config.event_close_mode, "alarm") == 0 )
    event_close_mode = CLOSE_ALARM;
  else
    event_close_mode = CLOSE_IDLE;

  event = 0;
  last_section_mod = 0;

  adaptive_skip = true;

  videoStore = nullptr;
}  // Monitor::Monitor

/*
  std::string load_monitor_sql =
 "SELECT Id, Name, ServerId, StorageId, Type, Function+0, Enabled, DecodingEnabled, LinkedMonitors, "
 "AnalysisFPSLimit, AnalysisUpdateDelay, MaxFPS, AlarmMaxFPS,"
 "Device, Channel, Format, V4LMultiBuffer, V4LCapturesPerFrame, " // V4L Settings
 "Protocol, Method, Options, User, Pass, Host, Port, Path, Width, Height, Colours, Palette, Orientation+0, Deinterlacing, RTSPDescribe, "
 "SaveJPEGs, VideoWriter, EncoderParameters,
 "OutputCodec, Encoder, OutputContainer,"
 "RecordAudio, "
 "Brightness, Contrast, Hue, Colour, "
 "EventPrefix, LabelFormat, LabelX, LabelY, LabelSize,"
 "ImageBufferCount, WarmupCount, PreEventCount, PostEventCount, StreamReplayBuffer, AlarmFrameCount, "
 "SectionLength, MinSectionLength, FrameSkip, MotionFrameSkip, "
 "FPSReportInterval, RefBlendPerc, AlarmRefBlendPerc, TrackMotion, Exif,"
 "`RTSPServer`,`RTSPStreamName`,
 "SignalCheckPoints, SignalCheckColour FROM Monitors";
*/

void Monitor::Load(MYSQL_ROW dbrow, bool load_zones=true, Purpose p = QUERY) {
  purpose = p;
  int col = 0;

  id = atoi(dbrow[col]); col++;
  strncpy(name, dbrow[col], sizeof(name)-1); col++;
  server_id = dbrow[col] ? atoi(dbrow[col]) : 0; col++;

  storage_id = atoi(dbrow[col]); col++;
  if ( storage )
    delete storage;
  storage = new Storage(storage_id);

  if ( ! strcmp(dbrow[col], "Local") ) {
    type = LOCAL;
  } else if ( ! strcmp(dbrow[col], "Ffmpeg") ) {
    type = FFMPEG;
  } else if ( ! strcmp(dbrow[col], "Remote") ) {
    type = REMOTE;
  } else if ( ! strcmp(dbrow[col], "File") ) {
    type = FILE;
  } else if ( ! strcmp(dbrow[col], "NVSocket") ) {
    type = NVSOCKET;
  } else if ( ! strcmp(dbrow[col], "Libvlc") ) {
    type = LIBVLC;
  } else if ( ! strcmp(dbrow[col], "cURL") ) {
    type = CURL;
  } else if ( ! strcmp(dbrow[col], "VNC") ) {
    type = VNC;
  } else {
    Fatal("Bogus monitor type '%s' for monitor %d", dbrow[col], id);
  }
  Debug(1, "Have camera type %s", CameraType_Strings[type].c_str());
  col++;
  function = (Function)atoi(dbrow[col]); col++;
  enabled = dbrow[col] ? atoi(dbrow[col]) : 0; col++;
  decoding_enabled = dbrow[col] ? atoi(dbrow[col]) : 0; col++;

  ReloadLinkedMonitors(dbrow[col]); col++;

  analysis_fps_limit = dbrow[col] ? strtod(dbrow[col], nullptr) : 0.0; col++;
  analysis_update_delay = strtoul(dbrow[col++], nullptr, 0);
  capture_delay = (dbrow[col] && atof(dbrow[col])>0.0)?int(DT_PREC_6/atof(dbrow[col])):0; col++;
  alarm_capture_delay = (dbrow[col] && atof(dbrow[col])>0.0)?int(DT_PREC_6/atof(dbrow[col])):0; col++;

  if ( dbrow[col] )
    strncpy(device, dbrow[col], sizeof(device)-1);
  else
    device[0] = 0;
  col++;

  channel = atoi(dbrow[col]); col++;
  format = atoi(dbrow[col]); col++;
  v4l_multi_buffer = config.v4l_multi_buffer;
  if ( dbrow[col] ) {
    if (*dbrow[col] == '0' ) {
      v4l_multi_buffer = false;
    } else if ( *dbrow[col] == '1' ) {
      v4l_multi_buffer = true;
    }
  }
  col++;

  v4l_captures_per_frame = 0;
  if ( dbrow[col] ) {
    v4l_captures_per_frame = atoi(dbrow[col]);
  } else {
    v4l_captures_per_frame = config.captures_per_frame;
  }
  col++;

  protocol = dbrow[col] ? dbrow[col] : ""; col++;
  method = dbrow[col] ? dbrow[col] : ""; col++;
  options = dbrow[col] ? dbrow[col] : ""; col++;
  user = dbrow[col] ? dbrow[col] : ""; col++;
  pass = dbrow[col] ? dbrow[col] : ""; col++;
  host = dbrow[col] ? dbrow[col] : ""; col++;
  port = dbrow[col] ? dbrow[col] : ""; col++;
  path = dbrow[col] ? dbrow[col] : ""; col++;

  camera_width = atoi(dbrow[col]); col++;
  camera_height = atoi(dbrow[col]); col++;

  colours = atoi(dbrow[col]); col++;
  palette = atoi(dbrow[col]); col++;
  orientation = (Orientation)atoi(dbrow[col]); col++;
  width = (orientation==ROTATE_90||orientation==ROTATE_270) ? camera_height : camera_width;
  height = (orientation==ROTATE_90||orientation==ROTATE_270) ? camera_width : camera_height;

  deinterlacing = atoi(dbrow[col]); col++;
  deinterlacing_value = deinterlacing & 0xff;

  decoder_hwaccel_name = dbrow[col] ? dbrow[col] : ""; col++;
  decoder_hwaccel_device = dbrow[col] ? dbrow[col] : ""; col++;

  rtsp_describe = (dbrow[col] && *dbrow[col] != '0'); col++;

  savejpegs = atoi(dbrow[col]); col++;
  videowriter = (VideoWriter)atoi(dbrow[col]); col++;
  encoderparams = dbrow[col] ? dbrow[col] : ""; col++;
  /* Parse encoder parameters */
  ParseEncoderParameters(encoderparams.c_str(), &encoderparamsvec);

  output_codec = dbrow[col] ? atoi(dbrow[col]) : 0; col++;
  encoder = dbrow[col] ? dbrow[col] : ""; col++;
  output_container = dbrow[col] ? dbrow[col] : ""; col++;
  record_audio = (*dbrow[col] != '0'); col++;

  brightness = atoi(dbrow[col]); col++;
  contrast = atoi(dbrow[col]); col++;
  hue = atoi(dbrow[col]); col++;
  colour = atoi(dbrow[col]); col++;

  if ( dbrow[col] )
    strncpy(event_prefix, dbrow[col], sizeof(event_prefix)-1);
  else
    event_prefix[0] = 0;
  col++;

  if ( dbrow[col] )
    strncpy(label_format, dbrow[col], sizeof(label_format)-1);
  else
    label_format[0] = 0;
  col++;

  // Change \n to actual line feeds
  char *token_ptr = label_format;
  const char *token_string = "\n";
  while ( ( token_ptr = strstr(token_ptr, token_string) ) ) {
    if ( *(token_ptr+1) ) {
      *token_ptr = '\n';
      token_ptr++;
      strcpy(token_ptr, token_ptr+1);
    } else {
      *token_ptr = '\0';
      break;
    }
  }

  label_coord = Coord(atoi(dbrow[col]), atoi(dbrow[col+1])); col += 2;
  label_size = atoi(dbrow[col]); col++;

  image_buffer_count = atoi(dbrow[col]); col++;
  warmup_count = atoi(dbrow[col]); col++;
  pre_event_count = atoi(dbrow[col]); col++;
  packetqueue.setMaxVideoPackets(pre_event_count);
  post_event_count = atoi(dbrow[col]); col++;
  stream_replay_buffer = atoi(dbrow[col]); col++;
  alarm_frame_count = atoi(dbrow[col]); col++;
  if ( alarm_frame_count < 1 )
    alarm_frame_count = 1;
  else if ( alarm_frame_count > MAX_PRE_ALARM_FRAMES )
    alarm_frame_count = MAX_PRE_ALARM_FRAMES;
  pre_event_buffer_count = pre_event_count + alarm_frame_count + warmup_count - 1;

  section_length = atoi(dbrow[col]); col++;
  min_section_length = atoi(dbrow[col]); col++;
  frame_skip = atoi(dbrow[col]); col++;
  motion_frame_skip = atoi(dbrow[col]); col++;
  fps_report_interval = atoi(dbrow[col]); col++;
  ref_blend_perc = atoi(dbrow[col]); col++;
  alarm_ref_blend_perc = atoi(dbrow[col]); col++;
  track_motion = atoi(dbrow[col]); col++;

  embed_exif = (*dbrow[col] != '0'); col++;
  rtsp_server = (*dbrow[col] != '0'); col++;
  rtsp_streamname = dbrow[col]; col++;
  signal_check_points = atoi(dbrow[col]); col++;
  signal_check_colour = strtol(dbrow[col][0] == '#' ? dbrow[col]+1 : dbrow[col], 0, 16); col++;

  // How many frames we need to have before we start analysing
  ready_count = std::max(warmup_count, pre_event_count);

  last_alarm_count = 0;
  state = IDLE;
  last_signal = true;   // Defaulting to having signal so that we don't get a signal change on the first frame.
                        // Instead initial failure to capture will cause a loss of signal change which I think makes more sense.
  uint64_t image_size = width * height * colours;

  if ( strcmp(config.event_close_mode, "time") == 0 )
    event_close_mode = CLOSE_TIME;
  else if ( strcmp(config.event_close_mode, "alarm") == 0 )
    event_close_mode = CLOSE_ALARM;
  else
    event_close_mode = CLOSE_IDLE;

  mem_size = sizeof(SharedData)
       + sizeof(TriggerData)
       + sizeof(VideoStoreData) //Information to pass back to the capture process
       + (image_buffer_count * sizeof(struct timeval))
       + (image_buffer_count * width * height * colours)
       + 64; /* Padding used to permit aligning the images buffer to 64 byte boundary */

  Debug(1, "mem.size(%d) SharedData=%d TriggerData=%d VideoStoreData=%d timestamps=%d images=%dx%d = %" PRId64 " total=%" PRId64,
      sizeof(mem_size),
      sizeof(SharedData), sizeof(TriggerData), sizeof(VideoStoreData),
      (image_buffer_count*sizeof(struct timeval)),
      image_buffer_count, image_size, (image_buffer_count*image_size),
     mem_size);

  Zone **zones = 0;
  int n_zones = Zone::Load(this, zones);
  this->AddZones(n_zones, zones);
  this->AddPrivacyBitmask(zones);

  // Should maybe store this for later use
  std::string monitor_dir = stringtf("%s/%d", storage->Path(), id);
  LoadCamera();

  if ( purpose != QUERY ) {
    if ( mkdir(monitor_dir.c_str(), 0755) && ( errno != EEXIST ) ) {
      Error("Can't mkdir %s: %s", monitor_dir.c_str(), strerror(errno));
    }

    // Do this here to save a few cycles with all the comparisons
    decoding_enabled = !(
        ( function == RECORD or function == NODECT )
        and
        ( savejpegs == 0 )
        and
        ( videowriter == PASSTHROUGH )
        and
        !decoding_enabled
        );
    Debug(1, "Decoding enabled: %d", decoding_enabled);

    if ( config.record_diag_images ) {
      if ( config.record_diag_images_fifo ) {
        diag_path_ref = stringtf("%s/diagpipe-r-%d.jpg", staticConfig.PATH_SOCKS.c_str(), id);
        diag_path_delta = stringtf("%s/diagpipe-d-%d.jpg", staticConfig.PATH_SOCKS.c_str(), id);
        Fifo::fifo_create_if_missing(diag_path_ref.c_str());
        Fifo::fifo_create_if_missing(diag_path_delta.c_str());
      } else {
        diag_path_ref = stringtf("%s/%d/diag-r.jpg", storage->Path(), id);
        diag_path_delta = stringtf("%s/%d/diag-d.jpg", storage->Path(), id);
      }
    }
  }  // end if purpose


  Debug(1, "Loaded monitor %d(%s), %d zones", id, name, n_zones);
} // Monitor::Load

void Monitor::LoadCamera() {
  if (camera)
    return;

  switch (type) {
    case LOCAL: {
#if ZM_HAS_V4L
      int extras = (deinterlacing >> 24) & 0xff;

      camera = ZM::make_unique<LocalCamera>(this,
                                            device,
                                            channel,
                                            format,
                                            v4l_multi_buffer,
                                            v4l_captures_per_frame,
                                            method,
                                            camera_width,
                                            camera_height,
                                            colours,
                                            palette,
                                            brightness,
                                            contrast,
                                            hue,
                                            colour,
                                            purpose == CAPTURE,
                                            record_audio,
                                            extras
      );
#else
      Fatal("Not compiled with local v4l camera support");
#endif
      break;
    }
    case REMOTE: {
      if (protocol == "http") {
        camera = ZM::make_unique<RemoteCameraHttp>(this,
                                                   method,
                                                   host,
                                                   port,
                                                   path,
                                                   camera_width,
                                                   camera_height,
                                                   colours,
                                                   brightness,
                                                   contrast,
                                                   hue,
                                                   colour,
                                                   purpose == CAPTURE,
                                                   record_audio
        );
      }
#if HAVE_LIBAVFORMAT
      else if (protocol == "rtsp") {
        camera = ZM::make_unique<RemoteCameraRtsp>(this,
                                                   method,
                                                   host, // Host
                                                   port, // Port
                                                   path, // Path
                                                   camera_width,
                                                   camera_height,
                                                   rtsp_describe,
                                                   colours,
                                                   brightness,
                                                   contrast,
                                                   hue,
                                                   colour,
                                                   purpose == CAPTURE,
                                                   record_audio
        );
      }
#endif // HAVE_LIBAVFORMAT
      else {
        Error("Unexpected remote camera protocol '%s'", protocol.c_str());
      }
      break;
    }
    case FILE: {
      camera = ZM::make_unique<FileCamera>(this,
                                           path.c_str(),
                                           camera_width,
                                           camera_height,
                                           colours,
                                           brightness,
                                           contrast,
                                           hue,
                                           colour,
                                           purpose == CAPTURE,
                                           record_audio
      );
      break;
    }
#if HAVE_LIBAVFORMAT
    case FFMPEG: {
      camera = ZM::make_unique<FfmpegCamera>(this,
                                             path,
                                             method,
                                             options,
                                             camera_width,
                                             camera_height,
                                             colours,
                                             brightness,
                                             contrast,
                                             hue,
                                             colour,
                                             purpose == CAPTURE,
                                             record_audio,
                                             decoder_hwaccel_name,
                                             decoder_hwaccel_device
      );
      break;
    }
#endif // HAVE_LIBAVFORMAT
    case NVSOCKET: {
      camera = ZM::make_unique<RemoteCameraNVSocket>(this,
                                                     host.c_str(),
                                                     port.c_str(),
                                                     path.c_str(),
                                                     camera_width,
                                                     camera_height,
                                                     colours,
                                                     brightness,
                                                     contrast,
                                                     hue,
                                                     colour,
                                                     purpose == CAPTURE,
                                                     record_audio
      );
      break;
    }
    case LIBVLC: {
#if HAVE_LIBVLC
      camera = ZM::make_unique<LibvlcCamera>(this,
                                             path.c_str(),
                                             method,
                                             options,
                                             camera_width,
                                             camera_height,
                                             colours,
                                             brightness,
                                             contrast,
                                             hue,
                                             colour,
                                             purpose == CAPTURE,
                                             record_audio
      );
#else // HAVE_LIBVLC
      Error("You must have vlc libraries installed to use vlc cameras for monitor %d", id);
#endif // HAVE_LIBVLC
      break;
    }
    case CURL: {
#if HAVE_LIBCURL
      camera = ZM::make_unique<cURLCamera>(this,
                                           path.c_str(),
                                           user.c_str(),
                                           pass.c_str(),
                                           camera_width,
                                           camera_height,
                                           colours,
                                           brightness,
                                           contrast,
                                           hue,
                                           colour,
                                           purpose == CAPTURE,
                                           record_audio
      );
#else // HAVE_LIBCURL
      Error("You must have libcurl installed to use ffmpeg cameras for monitor %d", id);
#endif // HAVE_LIBCURL
      break;
    }
    case VNC: {
#if HAVE_LIBVNC
      camera = ZM::make_unique<VncCamera>(this,
                                          host.c_str(),
                                          port.c_str(),
                                          user.c_str(),
                                          pass.c_str(),
                                          width,
                                          height,
                                          colours,
                                          brightness,
                                          contrast,
                                          hue,
                                          colour,
                                          purpose == CAPTURE,
                                          record_audio
      );
#else // HAVE_LIBVNC
      Fatal("You must have libvnc installed to use VNC cameras for monitor id %d", id);
#endif // HAVE_LIBVNC
      break;
    }
    default: {
      Fatal("Tried to load unsupported camera type %d for monitor %u", int(type), id);
      break;
    }
  }
}

std::shared_ptr<Monitor> Monitor::Load(unsigned int p_id, bool load_zones, Purpose purpose) {
  std::string sql = load_monitor_sql + stringtf(" WHERE Id=%d", p_id);

  zmDbRow dbrow;
  if ( !dbrow.fetch(sql.c_str()) ) {
    Error("Can't use query result: %s", mysql_error(&dbconn));
    return nullptr;
  }

  std::shared_ptr<Monitor> monitor = std::make_shared<Monitor>();
  monitor->Load(dbrow.mysql_row(), load_zones, purpose);

  return monitor;
}

bool Monitor::connect() {
  Debug(3, "Connecting to monitor.  Purpose is %d", purpose);
#if ZM_MEM_MAPPED
  snprintf(mem_file, sizeof(mem_file), "%s/zm.mmap.%d", staticConfig.PATH_MAP.c_str(), id);
  if (purpose != CAPTURE) {
    map_fd = open(mem_file, O_RDWR);
  } else {
    map_fd = open(mem_file, O_RDWR|O_CREAT, (mode_t)0660);
  }

  if (map_fd < 0) {
    Error("Can't open memory map file %s: %s", mem_file, strerror(errno));
    return false;
  } else {
    Debug(3, "Success opening mmap file at (%s)", mem_file);
  }

  struct stat map_stat;
  if (fstat(map_fd, &map_stat) < 0) {
    Error("Can't stat memory map file %s: %s, is the zmc process for this monitor running?", mem_file, strerror(errno));
    close(map_fd);
    map_fd = -1;
    return false;
  }

  if (map_stat.st_size != mem_size) {
    if (purpose == CAPTURE) {
      // Allocate the size
      if (ftruncate(map_fd, mem_size) < 0) {
        Error("Can't extend memory map file %s to %d bytes: %s", mem_file, mem_size, strerror(errno));
        close(map_fd);
        map_fd = -1;
        return false;
      }
    } else if (map_stat.st_size == 0) {
      Error("Got empty memory map file size %ld, is the zmc process for this monitor running?", map_stat.st_size, mem_size);
      close(map_fd);
      map_fd = -1;
      return false;
    } else {
      Error("Got unexpected memory map file size %ld, expected %d", map_stat.st_size, mem_size);
      close(map_fd);
      map_fd = -1;
      return false;
    }
  }  // end if map_stat.st_size != mem_size

  Debug(3, "MMap file size is %ld", map_stat.st_size);
#ifdef MAP_LOCKED
  mem_ptr = (unsigned char *)mmap(nullptr, mem_size, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_LOCKED, map_fd, 0);
  if (mem_ptr == MAP_FAILED) {
    if (errno == EAGAIN) {
      Debug(1, "Unable to map file %s (%d bytes) to locked memory, trying unlocked", mem_file, mem_size);
#endif
      mem_ptr = (unsigned char *)mmap(nullptr, mem_size, PROT_READ|PROT_WRITE, MAP_SHARED, map_fd, 0);
      Debug(1, "Mapped file %s (%d bytes) to unlocked memory", mem_file, mem_size);
#ifdef MAP_LOCKED
    } else {
      Error("Unable to map file %s (%d bytes) to locked memory (%s)", mem_file, mem_size, strerror(errno));
    }
  }
#endif
  if ((mem_ptr == MAP_FAILED) or (mem_ptr == nullptr)) {
    Error("Can't map file %s (%d bytes) to memory: %s(%d)", mem_file, mem_size, strerror(errno), errno);
    close(map_fd);
    map_fd = -1;
    mem_ptr = nullptr;
    return false;
  }
#else // ZM_MEM_MAPPED
  shm_id = shmget((config.shm_key&0xffff0000)|id, mem_size, IPC_CREAT|0700);
  if (shm_id < 0) {
    Fatal("Can't shmget, probably not enough shared memory space free: %s", strerror(errno));
  }
  mem_ptr = (unsigned char *)shmat(shm_id, 0, 0);
  if (mem_ptr < (void *)0) {
    Fatal("Can't shmat: %s", strerror(errno));
  }
#endif // ZM_MEM_MAPPED

  shared_data = (SharedData *)mem_ptr;
  trigger_data = (TriggerData *)((char *)shared_data + sizeof(SharedData));
  video_store_data = (VideoStoreData *)((char *)trigger_data + sizeof(TriggerData));
  shared_timestamps = (struct timeval *)((char *)video_store_data + sizeof(VideoStoreData));
  shared_images = (unsigned char *)((char *)shared_timestamps + (image_buffer_count*sizeof(struct timeval)));

  if (((unsigned long)shared_images % 64) != 0) {
    /* Align images buffer to nearest 64 byte boundary */
    Debug(3, "Aligning shared memory images to the next 64 byte boundary");
    shared_images = (uint8_t*)((unsigned long)shared_images + (64 - ((unsigned long)shared_images % 64)));
  }
  if (!camera) LoadCamera();

  Debug(3, "Allocating %d image buffers", image_buffer_count);
  image_buffer = new ZMPacket[image_buffer_count];
  for (int32_t i = 0; i < image_buffer_count; i++) {
    image_buffer[i].image_index = i;
    image_buffer[i].timestamp = &(shared_timestamps[i]);
    image_buffer[i].image = new Image(width, height, camera->Colours(), camera->SubpixelOrder(), &(shared_images[i*camera->ImageSize()]));
    image_buffer[i].image->HoldBuffer(true); /* Don't release the internal buffer or replace it with another */
  }
  if (deinterlacing_value == 4) {
    /* Four field motion adaptive deinterlacing in use */
    /* Allocate a buffer for the next image */
    next_buffer.image = new Image(width, height, camera->Colours(), camera->SubpixelOrder());
  }

  if (purpose == CAPTURE) {
    memset(mem_ptr, 0, mem_size);
    shared_data->size = sizeof(SharedData);
    shared_data->active = enabled;
    shared_data->signal = false;
    shared_data->capture_fps = 0.0;
    shared_data->analysis_fps = 0.0;
    shared_data->state = IDLE;
    shared_data->last_write_index = image_buffer_count;
    shared_data->last_read_index = image_buffer_count;
    shared_data->last_write_time = 0;
    shared_data->last_event_id = 0;
    shared_data->action = (Action)0;
    shared_data->brightness = -1;
    shared_data->hue = -1;
    shared_data->colour = -1;
    shared_data->contrast = -1;
    shared_data->alarm_x = -1;
    shared_data->alarm_y = -1;
    shared_data->format = camera->SubpixelOrder();
    shared_data->imagesize = camera->ImageSize();
    shared_data->alarm_cause[0] = 0;
    shared_data->video_fifo_path[0] = 0;
    shared_data->audio_fifo_path[0] = 0;
    shared_data->last_frame_score = 0;
    shared_data->audio_frequency = -1;
    shared_data->audio_channels = -1;
    trigger_data->size = sizeof(TriggerData);
    trigger_data->trigger_state = TriggerState::TRIGGER_CANCEL;
    trigger_data->trigger_score = 0;
    trigger_data->trigger_cause[0] = 0;
    trigger_data->trigger_text[0] = 0;
    trigger_data->trigger_showtext[0] = 0;
    video_store_data->recording = (struct timeval){0};
    // Uh, why nothing?  Why not nullptr?
    snprintf(video_store_data->event_file, sizeof(video_store_data->event_file), "nothing");
    video_store_data->size = sizeof(VideoStoreData);
    shared_data->valid = true;
  } else if ( !shared_data->valid ) {
    Error("Shared data not initialised by capture daemon for monitor %s", name);
    return false;
  }

  // We set these here because otherwise the first fps calc is meaningless
  struct timeval now;
  gettimeofday(&now, nullptr);
  double now_double = (double)now.tv_sec + (0.000001f * now.tv_usec);
  last_fps_time = now_double;
  last_analysis_fps_time = now_double;

  Debug(3, "Success connecting");
  return true;
} // Monitor::connect

bool Monitor::disconnect() {
  if (mem_ptr == nullptr) {
    Debug(1, "Already disconnected");
    return true;
  }

#if ZM_MEM_MAPPED
  msync(mem_ptr, mem_size, MS_ASYNC);
  munmap(mem_ptr, mem_size);
  if (map_fd >= 0) close(map_fd);

  map_fd = -1;
  mem_ptr = nullptr;
  shared_data = nullptr;

  if (purpose == CAPTURE and (unlink(mem_file) < 0) ) {
    Warning("Can't unlink '%s': %s", mem_file, strerror(errno));
  }
#else // ZM_MEM_MAPPED
  struct shmid_ds shm_data;
  if (shmctl(shm_id, IPC_STAT, &shm_data) < 0) {
    Debug(3, "Can't shmctl: %s", strerror(errno));
    return false;
  }

  shm_id = 0;

  if ((shm_data.shm_nattch <= 1) and (shmctl(shm_id, IPC_RMID, 0) < 0)) {
    Debug(3, "Can't shmctl: %s", strerror(errno));
    return false;
  }

  if (shmdt(mem_ptr) < 0) {
    Debug(3, "Can't shmdt: %s", strerror(errno));
    return false;
  }
#endif // ZM_MEM_MAPPED

  if (image_buffer) {
    for ( int32_t i = 0; i < image_buffer_count; i++ ) {
      // We delete the image because it is an object pointing to space that won't be free'd.
      delete image_buffer[i].image;
      image_buffer[i].image = nullptr;
      // We don't delete the timestamp because it is just a pointer to shared mem.
      image_buffer[i].timestamp = nullptr;
    }
    delete[] image_buffer;
    image_buffer = nullptr;
  }

  return true;
}  // end bool Monitor::disconnect()

Monitor::~Monitor() {
  Close();

  if (mem_ptr != nullptr) {
    if (purpose != QUERY) {
      shared_data->state = state = IDLE;
      shared_data->last_read_index = image_buffer_count;
      shared_data->last_read_time = 0;
      shared_data->valid = false;
      memset(mem_ptr, 0, mem_size);
      if ( (deinterlacing & 0xff) == 4 ) {
        delete next_buffer.image;
        delete next_buffer.timestamp;
      }
    }  // end if purpose != query
    disconnect();
  }  // end if mem_ptr

  if (analysis_it) {
    packetqueue.free_it(analysis_it);
    analysis_it = nullptr;
  }

  for ( int i = 0; i < n_zones; i++ ) {
    delete zones[i];
  }
  delete[] zones;

  delete storage;
  if (n_linked_monitors) {
    for ( int i=0; i < n_linked_monitors; i++ ) {
      delete linked_monitors[i];
    }
    delete[] linked_monitors;
    linked_monitors = nullptr;
  }

  if (video_fifo) delete video_fifo;
  if (audio_fifo) delete audio_fifo;
}  // end Monitor::~Monitor()

void Monitor::AddZones(int p_n_zones, Zone *p_zones[]) {
  for ( int i=0; i < n_zones; i++ )
    delete zones[i];
  delete[] zones;
  n_zones = p_n_zones;
  zones = p_zones;
}

void Monitor::AddPrivacyBitmask(Zone *p_zones[]) {
  if ( privacy_bitmask ) {
    delete[] privacy_bitmask;
    privacy_bitmask = nullptr;
  }
  Image *privacy_image = nullptr;

  for ( int i=0; i < n_zones; i++ ) {
    if ( p_zones[i]->IsPrivacy() ) {
      if ( !privacy_image ) {
        privacy_image = new Image(width, height, 1, ZM_SUBPIX_ORDER_NONE);
        privacy_image->Clear();
      }
      privacy_image->Fill(0xff, p_zones[i]->GetPolygon());
      privacy_image->Outline(0xff, p_zones[i]->GetPolygon());
    }
  } // end foreach zone
  if ( privacy_image )
    privacy_bitmask = privacy_image->Buffer();
}

int Monitor::GetImage(int32_t index, int scale) {
  if ( index < 0 || index > image_buffer_count ) {
    index = shared_data->last_write_index;
  }
  if ( index != image_buffer_count ) {
    Image *image;
    // If we are going to be modifying the snapshot before writing, then we need to copy it
    if ( ( scale != ZM_SCALE_BASE ) || ( !config.timestamp_on_capture ) ) {
      ZMPacket *snap = &image_buffer[index];
      alarm_image.Assign(*snap->image);

      if ( scale != ZM_SCALE_BASE ) {
        alarm_image.Scale(scale);
      }

      if ( !config.timestamp_on_capture ) {
        TimestampImage(&alarm_image, snap->timestamp);
      }
      image = &alarm_image;
    } else {
      image = image_buffer[index].image;
    }

    static char filename[PATH_MAX];
    snprintf(filename, sizeof(filename), "Monitor%d.jpg", id);
    image->WriteJpeg(filename);
  } else {
    Error("Unable to generate image, no images in buffer");
  }
  return 0;
}

ZMPacket *Monitor::getSnapshot(int index) const {

  if ( (index < 0) || (index > image_buffer_count) ) {
    index = shared_data->last_write_index;
  }
  return &image_buffer[index];

  return nullptr;
}

struct timeval Monitor::GetTimestamp(int index) const {
  ZMPacket *packet = getSnapshot(index);
  if ( packet ) 
    return *packet->timestamp;

  static struct timeval null_tv = { 0, 0 };
  return null_tv;
}

unsigned int Monitor::GetLastReadIndex() const {
  return ( shared_data->last_read_index != image_buffer_count ? shared_data->last_read_index : -1 );
}

unsigned int Monitor::GetLastWriteIndex() const {
  return ( shared_data->last_write_index != image_buffer_count ? shared_data->last_write_index : -1 );
}

uint64_t Monitor::GetLastEventId() const {
  return shared_data->last_event_id;
}

// This function is crap.
double Monitor::GetFPS() const {
  return get_capture_fps();
  // last_write_index is the last capture index.  It starts as == image_buffer_count so that the first asignment % image_buffer_count = 0;
  int32_t index1 = shared_data->last_write_index;
  if ( index1 >= image_buffer_count ) {
    // last_write_index only has this value on startup before capturing anything.
    return 0.0;
  }
  Debug(2, "index1(%d)", index1);
  ZMPacket *snap1 = &image_buffer[index1];
  if ( !snap1->timestamp->tv_sec ) {
    // This should be impossible
    Warning("Impossible situation.  No timestamp on captured image index was %d, image-buffer_count was (%d)", index1, image_buffer_count);
    return 0.0;
  }
  struct timeval time1 = *snap1->timestamp;

  int32_t fps_image_count = image_buffer_count;

  int32_t index2 = (index1+1)%image_buffer_count;
  Debug(2, "index2(%d)", index2);
  ZMPacket *snap2 = &image_buffer[index2];
  // the timestamp pointers are initialized on connection, so that's redundant
  // tv_sec is probably only zero during the first loop of capturing, so this basically just counts the unused images.
  // The problem is that there is no locking, and we set the timestamp before we set last_write_index,
  // so there is a small window where the next image can have a timestamp in the future
  while ( !snap2->timestamp->tv_sec || tvDiffSec(*snap2->timestamp, *snap1->timestamp) < 0 ) {
    if ( index1 == index2 ) {
      // All images are uncaptured
      return 0.0;
    }
    index2 = (index2+1)%image_buffer_count;
    snap2 = &image_buffer[ index2 ];
    fps_image_count--;
  }
  struct timeval time2 = *snap2->timestamp;

  double time_diff = tvDiffSec( time2, time1 );
  if ( ! time_diff ) {
    Error("No diff between time_diff = %lf (%d:%ld.%ld - %d:%ld.%ld), ibc: %d",
        time_diff, index2, time2.tv_sec, time2.tv_usec, index1, time1.tv_sec, time1.tv_usec, image_buffer_count);
    return 0.0;
  }
  double curr_fps = fps_image_count/time_diff;

  if ( curr_fps < 0.0 ) {
    Error("Negative FPS %f, time_diff = %lf (%d:%ld.%ld - %d:%ld.%ld), ibc: %d",
        curr_fps, time_diff, index2, time2.tv_sec, time2.tv_usec, index1, time1.tv_sec, time1.tv_usec, image_buffer_count);
    return 0.0;
  } else {
    Debug(2, "GetFPS %f, time_diff = %lf (%d:%ld.%ld - %d:%ld.%ld), ibc: %d",
        curr_fps, time_diff, index2, time2.tv_sec, time2.tv_usec, index1, time1.tv_sec, time1.tv_usec, image_buffer_count);
  }
  return curr_fps;
}

/* I think this returns the # of micro seconds that we should sleep in order to maintain the desired analysis rate */
useconds_t Monitor::GetAnalysisRate() {
  double capture_fps = get_capture_fps();
  if ( !analysis_fps_limit ) {
    return 0;
  } else if ( analysis_fps_limit > capture_fps ) {
    if ( last_fps_time != last_analysis_fps_time ) {
      // At startup they are equal, should never be equal again
      Warning("Analysis fps (%.2f) is greater than capturing fps (%.2f)", analysis_fps_limit, capture_fps);
    }
    return 0;
  } else if ( capture_fps ) {
    return( ( 1000000 / analysis_fps_limit ) - ( 1000000 / capture_fps ) );
  }
  return 0;
}

void Monitor::UpdateAdaptiveSkip() {
  if ( config.opt_adaptive_skip ) {
    double capturing_fps = get_capture_fps();
    double analysis_fps = get_analysis_fps();
    if ( adaptive_skip && analysis_fps && ( analysis_fps < capturing_fps ) ) {
      Info("Analysis fps (%.2f) is lower than capturing fps (%.2f), disabling adaptive skip feature", analysis_fps, capturing_fps);
      adaptive_skip = false;
    } else if ( !adaptive_skip && ( !analysis_fps || ( analysis_fps >= capturing_fps ) ) ) {
      Info("Enabling adaptive skip feature");
      adaptive_skip = true;
    }
  } else {
    adaptive_skip = false;
  }
}

void Monitor::ForceAlarmOn( int force_score, const char *force_cause, const char *force_text ) {
  trigger_data->trigger_state = TriggerState::TRIGGER_ON;
  trigger_data->trigger_score = force_score;
  strncpy(trigger_data->trigger_cause, force_cause, sizeof(trigger_data->trigger_cause)-1);
  strncpy(trigger_data->trigger_text, force_text, sizeof(trigger_data->trigger_text)-1);
}

void Monitor::ForceAlarmOff() {
  trigger_data->trigger_state = TriggerState::TRIGGER_OFF;
}

void Monitor::CancelForced() {
  trigger_data->trigger_state = TriggerState::TRIGGER_CANCEL;
}

void Monitor::actionReload() {
  shared_data->action |= RELOAD;
}

void Monitor::actionEnable() {
  shared_data->action |= RELOAD;

  char sql[ZM_SQL_SML_BUFSIZ];
  snprintf(sql, sizeof(sql), "UPDATE `Monitors` SET `Enabled` = 1 WHERE `Id` = %d", id);
  zmDbDo(sql);
}

void Monitor::actionDisable() {
  shared_data->action |= RELOAD;

  char sql[ZM_SQL_SML_BUFSIZ];
  snprintf(sql, sizeof(sql), "UPDATE `Monitors` SET `Enabled` = 0 WHERE `Id` = %d", id);
  zmDbDo(sql);
}

void Monitor::actionSuspend() {
  shared_data->action |= SUSPEND;
}

void Monitor::actionResume() {
  shared_data->action |= RESUME;
}

int Monitor::actionBrightness(int p_brightness) {
  if ( purpose != CAPTURE ) {
    if ( p_brightness >= 0 ) {
      shared_data->brightness = p_brightness;
      shared_data->action |= SET_SETTINGS;
      int wait_loops = 10;
      while ( shared_data->action & SET_SETTINGS ) {
        if ( wait_loops-- ) {
          usleep(100000);
        } else {
          Warning("Timed out waiting to set brightness");
          return -1;
        }
      }
    } else {
      shared_data->action |= GET_SETTINGS;
      int wait_loops = 10;
      while ( shared_data->action & GET_SETTINGS ) {
        if ( wait_loops-- ) {
          usleep(100000);
        } else {
          Warning("Timed out waiting to get brightness");
          return -1;
        }
      }
    }
    return shared_data->brightness;
  }
  return camera->Brightness(p_brightness);
} // end int Monitor::actionBrightness(int p_brightness)

int Monitor::actionContrast(int p_contrast) {
  if ( purpose != CAPTURE ) {
    if ( p_contrast >= 0 ) {
      shared_data->contrast = p_contrast;
      shared_data->action |= SET_SETTINGS;
      int wait_loops = 10;
      while ( shared_data->action & SET_SETTINGS ) {
        if ( wait_loops-- ) {
          usleep(100000);
        } else {
          Warning("Timed out waiting to set contrast");
          return -1;
        }
      }
    } else {
      shared_data->action |= GET_SETTINGS;
      int wait_loops = 10;
      while ( shared_data->action & GET_SETTINGS ) {
        if ( wait_loops-- ) {
          usleep(100000);
        } else {
          Warning("Timed out waiting to get contrast");
          return -1;
        }
      }
    }
    return shared_data->contrast;
  }
  return camera->Contrast(p_contrast);
} // end int Monitor::actionContrast(int p_contrast)

int Monitor::actionHue(int p_hue) {
  if ( purpose != CAPTURE ) {
    if ( p_hue >= 0 ) {
      shared_data->hue = p_hue;
      shared_data->action |= SET_SETTINGS;
      int wait_loops = 10;
      while ( shared_data->action & SET_SETTINGS ) {
        if ( wait_loops-- ) {
          usleep(100000);
        } else {
          Warning("Timed out waiting to set hue");
          return -1;
        }
      }
    } else {
      shared_data->action |= GET_SETTINGS;
      int wait_loops = 10;
      while ( shared_data->action & GET_SETTINGS ) {
        if ( wait_loops-- ) {
          usleep(100000);
        } else {
          Warning("Timed out waiting to get hue");
          return -1;
        }
      }
    }
    return shared_data->hue;
  }
  return camera->Hue(p_hue);
} // end int Monitor::actionHue(int p_hue)

int Monitor::actionColour(int p_colour) {
  if ( purpose != CAPTURE ) {
    if ( p_colour >= 0 ) {
      shared_data->colour = p_colour;
      shared_data->action |= SET_SETTINGS;
      int wait_loops = 10;
      while ( shared_data->action & SET_SETTINGS ) {
        if ( wait_loops-- ) {
          usleep(100000);
        } else {
          Warning("Timed out waiting to set colour");
          return -1;
        }
      }
    } else {
      shared_data->action |= GET_SETTINGS;
      int wait_loops = 10;
      while ( shared_data->action & GET_SETTINGS ) {
        if ( wait_loops-- ) {
          usleep(100000);
        } else {
          Warning("Timed out waiting to get colour");
          return -1;
        }
      }
    }
    return shared_data->colour;
  }
  return camera->Colour(p_colour);
} // end int Monitor::actionColour(int p_colour)

void Monitor::DumpZoneImage(const char *zone_string) {
  int exclude_id = 0;
  int extra_colour = 0;
  Polygon extra_zone;

  if ( zone_string ) {
    if ( !Zone::ParseZoneString(zone_string, exclude_id, extra_colour, extra_zone) ) {
      Error("Failed to parse zone string, ignoring");
    }
  }

  Image *zone_image = nullptr;
  if ( ( (!staticConfig.SERVER_ID) || ( staticConfig.SERVER_ID == server_id ) ) && mem_ptr ) {
    Debug(3, "Trying to load from local zmc");
    int index = shared_data->last_write_index;
    ZMPacket *snap = getSnapshot(index);
    zone_image = new Image(*snap->image);
  } else {
    Debug(3, "Trying to load from event");
    // Grab the most revent event image
    std::string sql = stringtf("SELECT MAX(`Id`) FROM `Events` WHERE `MonitorId`=%d AND `Frames` > 0", id);
    zmDbRow eventid_row;
    if ( eventid_row.fetch(sql.c_str()) ) {
      uint64_t event_id = atoll(eventid_row[0]);

      Debug(3, "Got event %" PRIu64, event_id);
      EventStream *stream = new EventStream();
      stream->setStreamStart(event_id, (unsigned int)1);
      zone_image = stream->getImage();
      delete stream;
      stream = nullptr;
    } else {
      Error("Unable to load an event for monitor %d", id);
      return;
    }
  }

  if ( zone_image->Colours() == ZM_COLOUR_GRAY8 ) {
    zone_image->Colourise(ZM_COLOUR_RGB24, ZM_SUBPIX_ORDER_RGB);
  }

  for ( int i = 0; i < n_zones; i++ ) {
    if ( exclude_id && (!extra_colour || extra_zone.getNumCoords()) && zones[i]->Id() == exclude_id )
      continue;

    Rgb colour;
    if ( exclude_id && !extra_zone.getNumCoords() && zones[i]->Id() == exclude_id ) {
      colour = extra_colour;
    } else {
      if ( zones[i]->IsActive() ) {
        colour = kRGBRed;
      } else if ( zones[i]->IsInclusive() ) {
        colour = kRGBOrange;
      } else if ( zones[i]->IsExclusive() ) {
        colour = kRGBPurple;
      } else if ( zones[i]->IsPreclusive() ) {
        colour = kRGBBlue;
      } else {
        colour = kRGBWhite;
      }
    }
    zone_image->Fill(colour, 2, zones[i]->GetPolygon());
    zone_image->Outline(colour, zones[i]->GetPolygon());
  }

  if ( extra_zone.getNumCoords() ) {
    zone_image->Fill(extra_colour, 2, extra_zone);
    zone_image->Outline(extra_colour, extra_zone);
  }

  static char filename[PATH_MAX];
  snprintf(filename, sizeof(filename), "Zones%d.jpg", id);
  zone_image->WriteJpeg(filename);
  delete zone_image;
} // end void Monitor::DumpZoneImage(const char *zone_string)

void Monitor::DumpImage(Image *dump_image) const {
  if ( image_count && !(image_count%10) ) {
    static char filename[PATH_MAX];
    static char new_filename[PATH_MAX];
    snprintf(filename, sizeof(filename), "Monitor%d.jpg", id);
    snprintf(new_filename, sizeof(new_filename), "Monitor%d-new.jpg", id);
    if ( dump_image->WriteJpeg(new_filename) )
      rename(new_filename, filename);
  }
} // end void Monitor::DumpImage(Image *dump_image)

bool Monitor::CheckSignal(const Image *image) {
  static bool static_undef = true;
  /* RGB24 colors */
  static uint8_t red_val;
  static uint8_t green_val;
  static uint8_t blue_val;
  static uint8_t grayscale_val; /* 8bit grayscale color */
  static Rgb colour_val; /* RGB32 color */
  static int usedsubpixorder;

  if ( signal_check_points > 0 ) {
    if ( static_undef ) {
      static_undef = false;
      usedsubpixorder = camera->SubpixelOrder();
      colour_val = rgb_convert(signal_check_colour, ZM_SUBPIX_ORDER_BGR); /* HTML colour code is actually BGR in memory, we want RGB */
      colour_val = rgb_convert(colour_val, usedsubpixorder);
      red_val = RED_VAL_BGRA(signal_check_colour);
      green_val = GREEN_VAL_BGRA(signal_check_colour);
      blue_val = BLUE_VAL_BGRA(signal_check_colour);
      grayscale_val = signal_check_colour & 0xff; /* Clear all bytes but lowest byte */
    }

    const uint8_t *buffer = image->Buffer();
    int pixels = image->Pixels();
    int width = image->Width();
    int colours = image->Colours();

    int index = 0;
    for ( int i = 0; i < signal_check_points; i++ ) {
      while( true ) {
        // Why the casting to long long? also note that on a 64bit cpu, long long is 128bits
        index = (int)(((long long)rand()*(long long)(pixels-1))/RAND_MAX);
        if ( !config.timestamp_on_capture || !label_format[0] )
          break;
        // Avoid sampling the rows with timestamp in
        if ( index < (label_coord.Y()*width) || index >= (label_coord.Y()+Image::LINE_HEIGHT)*width )
          break;
      }

      if ( colours == ZM_COLOUR_GRAY8 ) {
        if ( *(buffer+index) != grayscale_val )
          return true;

      } else if ( colours == ZM_COLOUR_RGB24 ) {
        const uint8_t *ptr = buffer+(index*colours);

        if ( usedsubpixorder == ZM_SUBPIX_ORDER_BGR ) {
          if ( (RED_PTR_BGRA(ptr) != red_val) || (GREEN_PTR_BGRA(ptr) != green_val) || (BLUE_PTR_BGRA(ptr) != blue_val) )
            return true;
        } else {
          /* Assume RGB */
          if ( (RED_PTR_RGBA(ptr) != red_val) || (GREEN_PTR_RGBA(ptr) != green_val) || (BLUE_PTR_RGBA(ptr) != blue_val) )
            return true;
        }

      } else if ( colours == ZM_COLOUR_RGB32 ) {
        if ( usedsubpixorder == ZM_SUBPIX_ORDER_ARGB || usedsubpixorder == ZM_SUBPIX_ORDER_ABGR ) {
          if ( ARGB_ABGR_ZEROALPHA(*(((const Rgb*)buffer)+index)) != ARGB_ABGR_ZEROALPHA(colour_val) )
            return true;
        } else {
          /* Assume RGBA or BGRA */
          if ( RGBA_BGRA_ZEROALPHA(*(((const Rgb*)buffer)+index)) != RGBA_BGRA_ZEROALPHA(colour_val) )
            return true;
        }
      }
    } // end for < signal_check_points
    Debug(1, "SignalCheck: %d points, colour_val(%d)", signal_check_points, colour_val);
    return false;
  } // end if signal_check_points
  return true;
} // end bool Monitor::CheckSignal(const Image *image)

void Monitor::CheckAction() {
  struct timeval now;
  gettimeofday(&now, nullptr);

  if ( shared_data->action ) {
    // Can there be more than 1 bit set in the action?  Shouldn't these be elseifs?
    if ( shared_data->action & RELOAD ) {
      Info("Received reload indication at count %d", image_count);
      shared_data->action &= ~RELOAD;
      Reload();
    }
    if ( shared_data->action & SUSPEND ) {
      if ( Active() ) {
        Info("Received suspend indication at count %d", image_count);
        shared_data->active = false;
        //closeEvent();
      } else {
        Info("Received suspend indication at count %d, but wasn't active", image_count);
      }
      if ( config.max_suspend_time ) {
        auto_resume_time = now.tv_sec + config.max_suspend_time;
      }
      shared_data->action &= ~SUSPEND;
    } else if ( shared_data->action & RESUME ) {
      if ( Enabled() && !Active() ) {
        Info("Received resume indication at count %d", image_count);
        shared_data->active = true;
        ref_image = *(image_buffer[shared_data->last_write_index].image);
        ready_count = std::max(warmup_count, pre_event_count);
        shared_data->alarm_x = shared_data->alarm_y = -1;
      }
      shared_data->action &= ~RESUME;
    }
  } // end if shared_data->action

  if ( auto_resume_time && (now.tv_sec >= auto_resume_time) ) {
    Info("Auto resuming at count %d", image_count);
    shared_data->active = true;
    ref_image.Assign(*(image_buffer[shared_data->last_write_index].image));
    ready_count = std::max(warmup_count, pre_event_count);
    auto_resume_time = 0;
  }
}

void Monitor::UpdateCaptureFPS() {
  if ( fps_report_interval and 
      ( 
       !(image_count%fps_report_interval)
      or 
     ( (image_count < fps_report_interval) and !(image_count%10) )
     )
     ) {
    struct timeval now;
    gettimeofday(&now, nullptr);
    double now_double = (double)now.tv_sec + (0.000001f * now.tv_usec);
    double elapsed = now_double - last_fps_time;

    // If we are too fast, we get div by zero. This seems to happen in the case of audio packets.
    // Also only do the update at most 1/sec
    if ( elapsed > 1.0 ) {
      // # of images per interval / the amount of time it took
      double new_capture_fps = double((image_count - last_capture_image_count)/elapsed);
      unsigned int new_camera_bytes = camera->Bytes();
      unsigned int new_capture_bandwidth = (new_camera_bytes-last_camera_bytes)/elapsed;
      last_camera_bytes = new_camera_bytes;

      Debug(4, "%s: %d - last %d = %d now:%lf, last %lf, elapsed %lf = %lffps", "Capturing", image_count,
          last_capture_image_count, image_count - last_capture_image_count,
          now_double, last_analysis_fps_time,
          elapsed, new_capture_fps
          );
      Info("%s: images:%d - Capturing at %.2lf fps, capturing bandwidth %ubytes/sec",
          name, image_count, new_capture_fps, new_capture_bandwidth);
      shared_data->capture_fps = new_capture_fps;
      last_fps_time = now_double;
      last_capture_image_count = image_count;

      static char sql[ZM_SQL_SML_BUFSIZ];
      // The reason we update the Status as well is because if mysql restarts, the Monitor_Status table is lost,
      // and nothing else will update the status until zmc restarts. Since we are successfully capturing we can
      // assume that we are connected
      snprintf(sql, sizeof(sql),
          "INSERT INTO Monitor_Status (MonitorId,CaptureFPS,CaptureBandwidth,Status) "
          "VALUES (%d, %.2lf, %u, 'Connected') ON DUPLICATE KEY UPDATE "
          "CaptureFPS = %.2lf, CaptureBandwidth=%u, Status='Connected'",
          id, new_capture_fps, new_capture_bandwidth, new_capture_fps, new_capture_bandwidth);
      dbQueue.push(sql);
    } // now != last_fps_time
  } // end if report fps
}  // void Monitor::UpdateCaptureFPS()

void Monitor::UpdateAnalysisFPS() {
  Debug(1, "analysis_image_count(%d) motion_count(%d) fps_report_interval(%d) mod%d",
      analysis_image_count, motion_frame_count, fps_report_interval, 
      ((analysis_image_count && fps_report_interval) ? !(analysis_image_count%fps_report_interval) : -1 ) );

  if ( 
      ( analysis_image_count and fps_report_interval and !(analysis_image_count%fps_report_interval) )
      or 
      // In startup do faster updates
      ( (analysis_image_count < fps_report_interval) and !(analysis_image_count%10) )
     ) {
    //if ( analysis_image_count && fps_report_interval && !(analysis_image_count%fps_report_interval) ) {
    struct timeval now;
    gettimeofday(&now, nullptr);
    double now_double = (double)now.tv_sec + (0.000001f * now.tv_usec);
    double elapsed = now_double - last_analysis_fps_time;
    Debug(4, "%s: %d - now:%d.%d = %lf, last %lf, diff %lf", name, analysis_image_count,
        now.tv_sec, now.tv_usec, now_double, last_analysis_fps_time,
        elapsed
        );

    if ( elapsed > 1.0 ) {
      double new_analysis_fps = double(motion_frame_count - last_motion_frame_count) / elapsed;
      Info("%s: %d - Analysing at %.2lf fps from %d - %d=%d / %lf - %lf = %lf",
          name, analysis_image_count, new_analysis_fps,
          motion_frame_count, last_motion_frame_count, (motion_frame_count - last_motion_frame_count),
          now_double, last_analysis_fps_time, elapsed);

      if ( new_analysis_fps != shared_data->analysis_fps ) {
        shared_data->analysis_fps = new_analysis_fps;

        char sql[ZM_SQL_SML_BUFSIZ];
        snprintf(sql, sizeof(sql),
            "INSERT INTO Monitor_Status (MonitorId,AnalysisFPS) VALUES (%d, %.2lf)"
            " ON DUPLICATE KEY UPDATE AnalysisFPS = %.2lf",
            id, new_analysis_fps, new_analysis_fps);
        dbQueue.push(sql);
        last_analysis_fps_time = now_double;
        last_motion_frame_count = motion_frame_count;
      } else {
        Debug(4, "No change in fps");
      } // end if change in fps
    } // end if at least 1 second has passed since last update

  } // end if time to do an update
} // end void Monitor::UpdateAnalysisFPS

// Would be nice if this JUST did analysis
// This idea is that we should be analysing as close to the capture frame as possible.
// This function should process as much as possible before returning
//
// If there is an event, the we should do our best to empty the queue.
// If there isn't then we keep pre-event + alarm frames. = pre_event_count
bool Monitor::Analyse() {

  if ( !Enabled() ) {
    Warning("Shouldn't be doing Analyse when not Enabled");
    return false;
  }
  if ( !analysis_it ) 
    analysis_it = packetqueue.get_video_it(true);

  // if have event, send frames until we find a video packet, at which point do analysis. Adaptive skip should only affect which frames we do analysis on.

  // get_analysis_packet will lock the packet and may wait if analysis_it is at the end
  ZMPacket *snap = packetqueue.get_packet(analysis_it);
  if ( !snap ) return false;

  // Is it possible for snap->score to be ! -1 ? Not if everything is working correctly
  if ( snap->score != -1 ) {
    snap->unlock();
    packetqueue.increment_it(analysis_it);
    Error("skipping because score was %d", snap->score);
    return false;
  }

  packetqueue_iterator snap_it = *analysis_it;
  packetqueue.increment_it(analysis_it);

  // signal is set by capture
  bool signal = shared_data->signal;
  bool signal_change = (signal != last_signal);

  Debug(3, "Motion detection is enabled signal(%d) signal_change(%d) trigger state(%d) image index %d",
      signal, signal_change, int(trigger_data->trigger_state), snap->image_index);

  // Need to guard around event creation/deletion from Reload()
  std::lock_guard<std::mutex> lck(event_mutex);

  // if we have been told to be OFF, then we are off and don't do any processing.
  if ( trigger_data->trigger_state != TriggerState::TRIGGER_OFF ) {
    Debug(4, "Trigger not OFF state is (%d)", int(trigger_data->trigger_state));
    int score = 0;
    // Ready means that we have captured the warmup # of frames
    if ( !Ready() ) {
      Debug(3, "Not ready?");
      snap->unlock();
      return false;
    }

    Debug(4, "Ready");
    std::string cause;
    Event::StringSetMap noteSetMap;

    // Specifically told to be on.  Setting the score here will trigger the alarm.
    if ( trigger_data->trigger_state == TriggerState::TRIGGER_ON ) {
      score += trigger_data->trigger_score;
      Debug(1, "Triggered on score += %d => %d", trigger_data->trigger_score, score);
      if ( !event ) {
        cause += trigger_data->trigger_cause;
      }
      Event::StringSet noteSet;
      noteSet.insert(trigger_data->trigger_text);
      noteSetMap[trigger_data->trigger_cause] = noteSet;
    } // end if trigger_on

    if ( signal_change ) {
      Debug(2, "Signal change, new signal is %d", signal);
      const char *signalText = "Unknown";
      if ( !signal ) {
        signalText = "Lost";
        if ( event ) {
          Info("%s: %03d - Closing event %" PRIu64 ", signal loss", name, analysis_image_count, event->Id());
          closeEvent();
          last_section_mod = 0;
        }
      } else {
        signalText = "Reacquired";
        score += 100;
      }
      if ( !event ) {
        if ( cause.length() )
          cause += ", ";
        cause += SIGNAL_CAUSE;
      }
      Event::StringSet noteSet;
      noteSet.insert(signalText);
      noteSetMap[SIGNAL_CAUSE] = noteSet;
      shared_data->state = state = IDLE;
      shared_data->active = signal;
      if ( (function == MODECT or function == MOCORD) and snap->image )
        ref_image.Assign(*(snap->image));
    }// else 

    if ( signal ) {
      if ( snap->image or (snap->packet.stream_index == video_stream_id) ) {
        struct timeval *timestamp = snap->timestamp;

        if ( Active() and (function == MODECT or function == MOCORD) and snap->image ) {
          Debug(3, "signal and active and modect");
          Event::StringSet zoneSet;

          int motion_score = last_motion_score;

          if ( analysis_fps_limit ) {
            double capture_fps = get_capture_fps();
            motion_frame_skip = capture_fps / analysis_fps_limit;
            Debug(1, "Recalculating motion_frame_skip (%d) = capture_fps(%f) / analysis_fps(%f)",
                motion_frame_skip, capture_fps, analysis_fps_limit);
          }

          if ( !(analysis_image_count % (motion_frame_skip+1)) ) {
            if ( snap->image ) {
              // Get new score.
              motion_score = DetectMotion(*(snap->image), zoneSet);

              Debug(3, "After motion detection, score:%d last_motion_score(%d), new motion score(%d)",
                  score, last_motion_score, motion_score);
            } else {
              Warning("No image in snap");
            }
            // Why are we updating the last_motion_score too?
            last_motion_score = motion_score;
            motion_frame_count += 1;
          } else {
            Debug(1, "Skipped motion detection");
          }
          if ( motion_score ) {
            score += motion_score;
            if ( cause.length() )
              cause += ", ";
            cause += MOTION_CAUSE;
            noteSetMap[MOTION_CAUSE] = zoneSet;
          } // end if motion_score
        } // end if active and doing motion detection

        // Check to see if linked monitors are triggering.
        if ( n_linked_monitors > 0 ) {
          Debug(4, "Checking linked monitors");
          // FIXME improve logic here
          bool first_link = true;
          Event::StringSet noteSet;
          for ( int i = 0; i < n_linked_monitors; i++ ) {
            // TODO: Shouldn't we try to connect?
            if ( linked_monitors[i]->isConnected() ) {
              Debug(4, "Linked monitor %d %s is connected",
                  linked_monitors[i]->Id(), linked_monitors[i]->Name());
              if ( linked_monitors[i]->hasAlarmed() ) {
                Debug(4, "Linked monitor %d %s is alarmed",
                    linked_monitors[i]->Id(), linked_monitors[i]->Name());
                if ( !event ) {
                  if ( first_link ) {
                    if ( cause.length() )
                      cause += ", ";
                    cause += LINKED_CAUSE;
                    first_link = false;
                  }
                }
                noteSet.insert(linked_monitors[i]->Name());
                score += linked_monitors[i]->lastFrameScore(); // 50;
              } else {
                Debug(4, "Linked monitor %d %s is not alarmed",
                    linked_monitors[i]->Id(), linked_monitors[i]->Name());
              }
            } else {
              Debug(1, "Linked monitor %d %d is not connected. Connecting.", i, linked_monitors[i]->Id());
              linked_monitors[i]->connect();
            }
          } // end foreach linked_monitor
          if ( noteSet.size() > 0 )
            noteSetMap[LINKED_CAUSE] = noteSet;
        } // end if linked_monitors

        if ( function == RECORD || function == MOCORD ) {
          // If doing record, check to see if we need to close the event or not.

          if ( event ) {
            Debug(2, "Have event %" PRIu64 " in mocord", event->Id());
            if ( section_length
                && ( ( timestamp->tv_sec - video_store_data->recording.tv_sec ) >= section_length )
                && ( (function == MOCORD && (event_close_mode != CLOSE_TIME)) || ! ( timestamp->tv_sec % section_length ) )
               ) {

              Info("%s: %03d - Closing event %" PRIu64 ", section end forced %d - %d = %d >= %d",
                  name, image_count, event->Id(),
                  timestamp->tv_sec, video_store_data->recording.tv_sec, 
                  timestamp->tv_sec - video_store_data->recording.tv_sec,
                  section_length
                  );
              closeEvent();
            } // end if section_length
          } // end if event

          if ( !event ) {
            Debug(2, "Creating continuous event");
            if ( !snap->keyframe and (videowriter == PASSTHROUGH) ) {
              // Must start on a keyframe so rewind. Only for passthrough though I guess.
              // FIXME this iterator is not protected from invalidation
              packetqueue_iterator *start_it = packetqueue.get_event_start_packet_it(
                  snap_it, 0 /* pre_event_count */
                  );

              // This gets a lock on the starting packet
              ZMPacket *starting_packet = packetqueue.get_packet(start_it);

              event = new Event(this, *(starting_packet->timestamp), "Continuous", noteSetMap);
              // Write out starting packets, do not modify packetqueue it will garbage collect itself
              while ( starting_packet and (*start_it) != snap_it ) {
                event->AddPacket(starting_packet);
                // Have added the packet, don't want to unlock it until we have locked the next

                packetqueue.increment_it(start_it);
                if ( (*start_it) == snap_it ) {
                  starting_packet->unlock();
                  break;
                }
                ZMPacket *p = packetqueue.get_packet(start_it);
                starting_packet->unlock();
                starting_packet = p;
              }
              packetqueue.free_it(start_it);
              delete start_it;
              start_it = nullptr;
            } else {
              // Create event from current snap
              event = new Event(this, *timestamp, "Continuous", noteSetMap);
            }
            shared_data->last_event_id = event->Id();

            // lets construct alarm cause. It will contain cause + names of zones alarmed
            std::string alarm_cause = "Continuous";
            for ( int i=0; i < n_zones; i++ ) {
              if ( zones[i]->Alarmed() ) {
                alarm_cause += std::string(zones[i]->Label());
                if ( i < n_zones-1 ) {
                  alarm_cause += ",";
                }
              }
            }
            alarm_cause = cause+" "+alarm_cause;
            strncpy(shared_data->alarm_cause, alarm_cause.c_str(), sizeof(shared_data->alarm_cause)-1);
            video_store_data->recording = event->StartTime();
            Info("%s: %03d - Opened new event %" PRIu64 ", section start",
                name, analysis_image_count, event->Id());
            /* To prevent cancelling out an existing alert\prealarm\alarm state */
            if ( state == IDLE ) {
              shared_data->state = state = TAPE;
            }
          } // end if ! event
        } // end if RECORDING

        if ( score ) {
          if ( (state == IDLE) || (state == TAPE) || (state == PREALARM) ) {
            // If we should end then previous continuous event and start a new non-continuous event
            if ( event && event->Frames()
                && (!event->AlarmFrames())
                && (event_close_mode == CLOSE_ALARM)
                && ( ( timestamp->tv_sec - video_store_data->recording.tv_sec ) >= min_section_length )
                && ( (!pre_event_count) || (Event::PreAlarmCount() >= alarm_frame_count-1) )
               ) {
              Info("%s: %03d - Closing event %" PRIu64 ", continuous end, alarm begins",
                  name, image_count, event->Id());
              closeEvent();
            } else if ( event ) {
              // This is so if we need more than 1 alarm frame before going into alarm, so it is basically if we have enough alarm frames
              Debug(3, "pre-alarm-count in event %d, event frames %d, alarm frames %d event length %d >=? %d min",
                  Event::PreAlarmCount(), event->Frames(), event->AlarmFrames(), 
                  ( timestamp->tv_sec - video_store_data->recording.tv_sec ), min_section_length
                  );
            }
            if ( (!pre_event_count) || (Event::PreAlarmCount() >= alarm_frame_count-1) ) {
              // lets construct alarm cause. It will contain cause + names of zones alarmed
              std::string alarm_cause = "";
              for ( int i=0; i < n_zones; i++ ) {
                if ( zones[i]->Alarmed() ) {
                  alarm_cause = alarm_cause + "," + std::string(zones[i]->Label());
                }
              }
              if ( !alarm_cause.empty() ) alarm_cause[0] = ' ';
              alarm_cause = cause + alarm_cause;
              strncpy(shared_data->alarm_cause, alarm_cause.c_str(), sizeof(shared_data->alarm_cause)-1);
              Info("%s: %03d - Gone into alarm state PreAlarmCount: %u > AlarmFrameCount:%u Cause:%s",
                  name, image_count, Event::PreAlarmCount(), alarm_frame_count, shared_data->alarm_cause);

              if ( !event ) {
                packetqueue_iterator *start_it = packetqueue.get_event_start_packet_it(
                    snap_it,
                    (pre_event_count > alarm_frame_count ? pre_event_count : alarm_frame_count)
                    );
                ZMPacket *starting_packet = *(*start_it);

                event = new Event(this, *(starting_packet->timestamp), cause, noteSetMap);
                // Write out starting packets, do not modify packetqueue it will garbage collect itself
                while ( *start_it != snap_it ) {
                  event->AddPacket(starting_packet);

                  packetqueue.increment_it(start_it);
                  if ( (*start_it) == snap_it ) {
                    starting_packet->unlock();
                    break;
                  }
                  ZMPacket *p = packetqueue.get_packet(start_it);
                  starting_packet->unlock();
                  starting_packet = p;
                }
                packetqueue.free_it(start_it);
                delete start_it;
                start_it = nullptr;

                shared_data->last_event_id = event->Id();
                //set up video store data
                snprintf(video_store_data->event_file, sizeof(video_store_data->event_file), "%s", event->getEventFile());
                video_store_data->recording = event->StartTime();
                shared_data->state = state = ALARM;

                Info("%s: %03d - Opening new event %" PRIu64 ", alarm start", name, analysis_image_count, event->Id());
              }  // end if no event, so start it
              if ( alarm_frame_count ) {
                Debug(1, "alarm frame count so SavePreAlarmFrames");
                event->SavePreAlarmFrames();
              }
            } else if ( state != PREALARM ) {
              Info("%s: %03d - Gone into prealarm state", name, analysis_image_count);
              shared_data->state = state = PREALARM;
            }
          } else if ( state == ALERT ) {
            alert_to_alarm_frame_count--;
            Info("%s: %03d - Alarmed frame while in alert state. Consecutive alarmed frames left to return to alarm state: %03d",
                name, analysis_image_count, alert_to_alarm_frame_count);
            if (alert_to_alarm_frame_count == 0) {
              Info("%s: %03d - Gone back into alarm state", name, analysis_image_count);
              shared_data->state = state = ALARM;
            }
          }
          last_alarm_count = analysis_image_count;
        } else { // no score?
          alert_to_alarm_frame_count = alarm_frame_count; // load same value configured for alarm_frame_count 
          if ( state == ALARM ) {
            Info("%s: %03d - Gone into alert state", name, analysis_image_count);
            shared_data->state = state = ALERT;
          } else if ( state == ALERT ) {
            if ( 
                ( analysis_image_count-last_alarm_count > post_event_count ) 
                &&
                ( ( timestamp->tv_sec - video_store_data->recording.tv_sec ) >= min_section_length )
               ) {
              Info("%s: %03d - Left alarm state (%" PRIu64 ") - %d(%d) images",
                  name, analysis_image_count, event->Id(), event->Frames(), event->AlarmFrames());
              //if ( function != MOCORD || event_close_mode == CLOSE_ALARM || event->Cause() == SIGNAL_CAUSE )
              if ( (function != RECORD && function != MOCORD ) || event_close_mode == CLOSE_ALARM ) {
                shared_data->state = state = IDLE;
                Info("%s: %03d - Closing event %" PRIu64 ", alarm end%s",
                    name, analysis_image_count, event->Id(), (function==MOCORD)?", section truncated":"" );
                closeEvent();
              } else {
                shared_data->state = state = TAPE;
              }
            }
          } else if ( state == PREALARM ) {
            // Back to IDLE
            shared_data->state = state = ((function != MOCORD) ? IDLE : TAPE);
          } else {
            Debug(1, "State %d because image_count(%d)-last_alarm_count(%d) > post_event_count(%d) and timestamp.tv_sec(%d) - recording.tv_src(%d) >= min_section_length(%d)",
                state, analysis_image_count, last_alarm_count, post_event_count,
                timestamp->tv_sec, video_store_data->recording.tv_sec, min_section_length);
          }
          if ( Event::PreAlarmCount() )
            Event::EmptyPreAlarmFrames();
        } // end if score or not

        snap->score = score;

        if ( state == PREALARM ) {
          // Generate analysis images if necessary
          if ( (savejpegs > 1) and snap->image ) {
            for ( int i = 0; i < n_zones; i++ ) {
              if ( zones[i]->Alarmed() ) {
                if ( zones[i]->AlarmImage() ) {
                  if ( ! snap->analysis_image )
                    snap->analysis_image = new Image(*(snap->image));
                  snap->analysis_image->Overlay(*(zones[i]->AlarmImage()));
                }
              } // end if zone is alarmed
            } // end foreach zone
          } // end if savejpegs

          // incremement pre alarm image count
          //have_pre_alarmed_frames ++;
          Event::AddPreAlarmFrame(snap->image, *timestamp, score, nullptr);
        } else if ( state == ALARM ) {
          if ( ( savejpegs > 1 ) and snap->image ) {
            for ( int i = 0; i < n_zones; i++ ) {
              if ( zones[i]->Alarmed() ) {
                if ( zones[i]->AlarmImage() ) {
                  if ( ! snap->analysis_image )
                    snap->analysis_image = new Image(*(snap->image));
                  snap->analysis_image->Overlay(*(zones[i]->AlarmImage()));
                }
                if ( config.record_event_stats )
                  zones[i]->RecordStats(event);
              } // end if zone is alarmed
            } // end foreach zone
          } 
          if ( noteSetMap.size() > 0 )
            event->updateNotes(noteSetMap);
          if ( section_length
              && ( ( timestamp->tv_sec - video_store_data->recording.tv_sec ) >= section_length )
              && ! (image_count % fps_report_interval)
             ) {
            Warning("%s: %03d - event %" PRIu64 ", has exceeded desired section length. %d - %d = %d >= %d",
                name, image_count, event->Id(),
                timestamp->tv_sec, video_store_data->recording.tv_sec,
                timestamp->tv_sec - video_store_data->recording.tv_sec,
                section_length
                );
            closeEvent();
            event = new Event(this, *timestamp, cause, noteSetMap);
            shared_data->last_event_id = event->Id();
            //set up video store data
            snprintf(video_store_data->event_file, sizeof(video_store_data->event_file), "%s", event->getEventFile());
            video_store_data->recording = event->StartTime();
          }

        } else if ( state == ALERT ) {
          // Alert means this frame has no motion, but we were alarmed and are still recording.
          if ( noteSetMap.size() > 0 )
            event->updateNotes(noteSetMap);
        } else if ( state == TAPE ) {
          // bulk frame code moved to event.
        } // end if state machine

        if ( (function == MODECT or function == MOCORD) and snap->image ) {
          ref_image.Blend(*(snap->image), ( state==ALARM ? alarm_ref_blend_perc : ref_blend_perc ));
        }
        last_signal = signal;
      } // end if videostream
    } // end if signal
    shared_data->last_frame_score = score;
  } else {
    Debug(3, "trigger == off");
    if ( event ) {
      Info("%s: %03d - Closing event %" PRIu64 ", trigger off", name, analysis_image_count, event->Id());
      closeEvent();
    }
    shared_data->state = state = IDLE;
    trigger_data->trigger_state = TriggerState::TRIGGER_CANCEL;
  } // end if ( trigger_data->trigger_state != TRIGGER_OFF )

  if (event) event->AddPacket(snap);
#if 0
  if (snap->packet.stream_index == video_stream_id) {
    if (video_fifo) {
      if ( snap->keyframe ) {
        // avcodec strips out important nals that describe the stream and 
        // stick them in extradata. Need to send them along with keyframes
        AVStream *stream = camera->get_VideoStream();
        video_fifo->write(
            static_cast<unsigned char *>(stream->codecpar->extradata),
            stream->codecpar->extradata_size);
      }
      video_fifo->writePacket(*snap);
    }
  } else if (snap->packet.stream_index == audio_stream_id) {
    if (audio_fifo)
      audio_fifo->writePacket(*snap);
  }
#endif

  if ((videowriter == PASSTHROUGH) and !savejpegs) {
    // Don't need raw images anymore
    delete snap->image;
    snap->image = nullptr;
  }
  // popPacket will have placed a second lock on snap, so release it here.
  snap->unlock();

  if ( snap->image_index > 0 ) {
    // Only do these if it's a video packet.
    shared_data->last_read_index = snap->image_index;
    analysis_image_count++;
    if ( function == MODECT or function == MOCORD )
      UpdateAnalysisFPS();
  }
  shared_data->last_read_time = time(nullptr);
  packetqueue.clearPackets(snap);

  return true;
} // end Monitor::Analyse

void Monitor::Reload() {
  Debug(1, "Reloading monitor %s", name);

  // Access to the event needs to be protected.  Either thread could call Reload.  Either thread could close the event. 
  // Need a mutex on it I guess.  FIXME
  // Need to guard around event creation/deletion This will prevent event creation until new settings are loaded
  std::lock_guard<std::mutex> lck(event_mutex);
  if ( event ) {
    Info("%s: %03d - Closing event %" PRIu64 ", reloading", name, image_count, event->Id());
    closeEvent();
  }

  std::string sql = load_monitor_sql + stringtf(" WHERE Id=%d", id);
  zmDbRow *row = zmDbFetchOne(sql.c_str());
  if ( !row ) {
    Error("Can't run query: %s", mysql_error(&dbconn));
  } else if ( MYSQL_ROW dbrow = row->mysql_row() ) {
    Load(dbrow, 1, purpose);

    shared_data->state = state = IDLE;
    shared_data->alarm_x = shared_data->alarm_y = -1;
    if ( enabled )
      shared_data->active = true;
    ready_count = std::max(warmup_count, pre_event_count);

    delete row;
  }  // end if row

  ReloadZones();
}  // end void Monitor::Reload()

void Monitor::ReloadZones() {
  Debug(1, "Reloading zones for monitor %s", name);
  for( int i = 0; i < n_zones; i++ ) {
    delete zones[i];
  }
  delete[] zones;
  zones = nullptr;
  n_zones = Zone::Load(this, zones);
  //DumpZoneImage();
} // end void Monitor::ReloadZones()

void Monitor::ReloadLinkedMonitors(const char *p_linked_monitors) {
  Debug(1, "Reloading linked monitors for monitor %s, '%s'", name, p_linked_monitors);
  if ( n_linked_monitors ) {
    for ( int i=0; i < n_linked_monitors; i++ ) {
      delete linked_monitors[i];
    }
    delete[] linked_monitors;
    linked_monitors = nullptr;
  }

  n_linked_monitors = 0;
  if ( p_linked_monitors ) {
    int n_link_ids = 0;
    unsigned int link_ids[256];

    // This nasty code picks out strings of digits from p_linked_monitors and tries to load them. 
    char link_id_str[8];
    char *dest_ptr = link_id_str;
    const char *src_ptr = p_linked_monitors;
    while ( 1 ) {
      dest_ptr = link_id_str;
      while ( *src_ptr >= '0' && *src_ptr <= '9' ) {
        if ( (dest_ptr-link_id_str) < (unsigned int)(sizeof(link_id_str)-1) ) {
          *dest_ptr++ = *src_ptr++;
        } else {
          break;
        }
      }
      // Add the link monitor
      if ( dest_ptr != link_id_str ) {
        *dest_ptr = '\0';
        unsigned int link_id = atoi(link_id_str);
        if ( link_id > 0 && link_id != id ) {
          Debug(3, "Found linked monitor id %d", link_id);
          int j;
          for ( j = 0; j < n_link_ids; j++ ) {
            if ( link_ids[j] == link_id )
              break;
          }
          if ( j == n_link_ids ) {
            // Not already found
            link_ids[n_link_ids++] = link_id;
          }
        }
      }
      if ( !*src_ptr )
        break;
      while( *src_ptr && (*src_ptr < '0' || *src_ptr > '9') )
        src_ptr++;
      if ( !*src_ptr )
        break;
    }
    if ( n_link_ids > 0 ) {
      Debug(1, "Linking to %d monitors", n_link_ids);
      linked_monitors = new MonitorLink *[n_link_ids];
      int count = 0;
      for ( int i = 0; i < n_link_ids; i++ ) {
        Debug(1, "Checking linked monitor %d", link_ids[i]);

        std::lock_guard<std::mutex> lck(db_mutex);
        static char sql[ZM_SQL_SML_BUFSIZ];
        snprintf(sql, sizeof(sql),
            "SELECT `Id`, `Name` FROM `Monitors`"
            "  WHERE `Id` = %d"
            "   AND `Function` != 'None'"
            "   AND `Function` != 'Monitor'"
            "   AND `Enabled`=1",
            link_ids[i]);
        if (mysql_query(&dbconn, sql)) {
          Error("Can't run query: %s", mysql_error(&dbconn));
          continue;
        }

        MYSQL_RES *result = mysql_store_result(&dbconn);
        if ( !result ) {
          Error("Can't use query result: %s", mysql_error(&dbconn));
          continue;
        }
        int n_monitors = mysql_num_rows(result);
        if ( n_monitors == 1 ) {
          MYSQL_ROW dbrow = mysql_fetch_row(result);
          Debug(1, "Linking to monitor %d %s", atoi(dbrow[0]), dbrow[1]);
          linked_monitors[count++] = new MonitorLink(link_ids[i], dbrow[1]);
        } else {
          Warning("Can't link to monitor %d, invalid id, function or not enabled", link_ids[i]);
        }
        mysql_free_result(result);
      }  // end foreach link_id
      n_linked_monitors = count;
    }  // end if has link_ids
  }  // end if p_linked_monitors
}  // end void Monitor::ReloadLinkedMonitors(const char *p_linked_monitors)

std::vector<std::shared_ptr<Monitor>> Monitor::LoadMonitors(std::string where, Purpose purpose) {
  std::string sql = load_monitor_sql + " WHERE " + where;
  Debug(1, "Loading Monitors with %s", sql.c_str());

  MYSQL_RES *result = zmDbFetch(sql.c_str());
  if (!result) {
    Error("Can't load local monitors: %s", mysql_error(&dbconn));
    return {};
  }
  int n_monitors = mysql_num_rows(result);
  Debug(1, "Got %d monitors", n_monitors);

  std::vector<std::shared_ptr<Monitor>> monitors;
  monitors.reserve(n_monitors);

  for (int i = 0; MYSQL_ROW dbrow = mysql_fetch_row(result); i++) {
    monitors.emplace_back(std::make_shared<Monitor>());
    monitors.back()->Load(dbrow, true, purpose);
  }

  if (mysql_errno(&dbconn)) {
    Error("Can't fetch row: %s", mysql_error(&dbconn));
    mysql_free_result(result);
    return {};
  }
  mysql_free_result(result);

  return monitors;
}

#if ZM_HAS_V4L
std::vector<std::shared_ptr<Monitor>> Monitor::LoadLocalMonitors
(const char *device, Purpose purpose) {

  std::string where = "`Function` != 'None' AND `Type` = 'Local'";

  if ( device[0] )
    where += " AND `Device`='" + std::string(device) + "'";
  if (staticConfig.SERVER_ID)
    where += stringtf(" AND `ServerId`=%d", staticConfig.SERVER_ID);
  return LoadMonitors(where, purpose);
}
#endif // ZM_HAS_V4L

std::vector<std::shared_ptr<Monitor>> Monitor::LoadRemoteMonitors
(const char *protocol, const char *host, const char *port, const char *path, Purpose purpose) {
  std::string where = "`Function` != 'None' AND `Type` = 'Remote'";
  if (staticConfig.SERVER_ID)
    where += stringtf(" AND `ServerId`=%d", staticConfig.SERVER_ID);
  if (protocol)
    where += stringtf(" AND `Protocol` = '%s' AND `Host` = '%s' AND `Port` = '%s' AND `Path` = '%s'", protocol, host, port, path);
  return LoadMonitors(where, purpose);
}

std::vector<std::shared_ptr<Monitor>> Monitor::LoadFileMonitors(const char *file, Purpose purpose) {
  std::string where = "`Function` != 'None' AND `Type` = 'File'";
  if (file[0])
    where += " AND `Path`='" + std::string(file) + "'";
  if (staticConfig.SERVER_ID)
    where += stringtf(" AND `ServerId`=%d", staticConfig.SERVER_ID);
  return LoadMonitors(where, purpose);
}

#if HAVE_LIBAVFORMAT
std::vector<std::shared_ptr<Monitor>> Monitor::LoadFfmpegMonitors(const char *file, Purpose purpose) {
  std::string where = "`Function` != 'None' AND `Type` = 'Ffmpeg'";
  if (file[0])
    where += " AND `Path` = '" + std::string(file) + "'";
  if (staticConfig.SERVER_ID)
    where += stringtf(" AND `ServerId`=%d", staticConfig.SERVER_ID);
  return LoadMonitors(where, purpose);
}
#endif // HAVE_LIBAVFORMAT

/* Returns 0 on success, even if no new images are available (transient error)
 * Returns -1 on failure.
 */
int Monitor::Capture() {
  static int FirstCapture = 1; // Used in de-interlacing to indicate whether this is the even or odd image

  unsigned int index = image_count % image_buffer_count;

  ZMPacket *packet = new ZMPacket();
  packet->timestamp = new struct timeval;
  packet->image_index = image_count;
  gettimeofday(packet->timestamp, nullptr);

  Image* capture_image = image_buffer[index].image;
  int captureResult = 0;

  if ( deinterlacing_value == 4 ) {
    if ( FirstCapture != 1 ) {
      /* Copy the next image into the shared memory */
      //capture_image->CopyBuffer(*(next_buffer.image));
    }
    /* Capture a new next image */
    captureResult = camera->Capture(*packet);
    // How about set shared_data->current_timestamp
    gettimeofday(packet->timestamp, nullptr);

    if ( FirstCapture ) {
      FirstCapture = 0;
      return 0;
    }
  } else {
    captureResult = camera->Capture(*packet);
    Debug(4, "Back from capture result=%d image %d", captureResult, image_count);

    if ( captureResult < 0 ) {
      Debug(2, "failed capture");
      // Unable to capture image
      // Fake a signal loss image
      // Not sure what to do here.  We will close monitor and kill analysis_thread but what about rtsp server?
      Rgb signalcolor;
      /* HTML colour code is actually BGR in memory, we want RGB */
      signalcolor = rgb_convert(signal_check_colour, ZM_SUBPIX_ORDER_BGR);
      capture_image = new Image(width, height, camera->Colours(), camera->SubpixelOrder());
      capture_image->Fill(signalcolor);
      shared_data->signal = false;
      shared_data->last_write_index = index;
      shared_data->last_write_time = image_buffer[index].timestamp->tv_sec;
      image_buffer[index].image->Assign(*capture_image);
      *(image_buffer[index].timestamp) = *(packet->timestamp);
      delete capture_image;
      image_count++;
      delete packet;
      // What about timestamping it?
      // Don't want to do analysis on it, but we won't due to signal
      return -1;
    } else if ( captureResult > 0 ) {
      Debug(2, "Have packet stream_index:%d ?= videostream_id:(%d) q.vpktcount(%d) event?(%d) ",
          packet->packet.stream_index, video_stream_id, packetqueue.packet_count(video_stream_id), ( event ? 1 : 0 ) );

      if (packet->packet.stream_index == video_stream_id) {
        if (video_fifo) {
          if ( packet->keyframe ) {
            // avcodec strips out important nals that describe the stream and 
            // stick them in extradata. Need to send them along with keyframes
            AVStream *stream = camera->get_VideoStream();
#if LIBAVCODEC_VERSION_CHECK(57, 64, 0, 64, 0)
            video_fifo->write(
                static_cast<unsigned char *>(stream->codecpar->extradata),
                stream->codecpar->extradata_size,
                packet->pts);
#endif
          }
          video_fifo->writePacket(*packet);
        }
      } else if (packet->packet.stream_index == audio_stream_id) {
        if (audio_fifo)
          audio_fifo->writePacket(*packet);
      }

      if ( (packet->packet.stream_index != video_stream_id) and ! packet->image ) {
        // Only queue if we have some video packets in there. Should push this logic into packetqueue
        if ( record_audio and (packetqueue.packet_count(video_stream_id) or event) ) {
          packet->image_index=-1;
          Debug(2, "Queueing audio packet");
          packetqueue.queuePacket(packet);
        } else {
          Debug(4, "Not Queueing audio packet");
          delete packet;
        }
        // Don't update last_write_index because that is used for live streaming
        //shared_data->last_write_time = image_buffer[index].timestamp->tv_sec;
        return 1;
      } // end if audio

      if ( !packet->image ) {
        if ( packet->packet.size and !packet->in_frame ) {
          if ( !decoding_enabled ) {
            Debug(1, "Not decoding");
          } else {
            Debug(2,"About to decode %p", packet);
            // Allocate the image first so that it can be used by hwaccel
            // We don't actually care about camera colours, pixel order etc.  We care about the desired settings
            //
            //capture_image = packet->image = new Image(width, height, camera->Colours(), camera->SubpixelOrder());
            int ret = packet->decode(camera->get_VideoCodecContext());
            if ( ret < 0 ) {
              Error("decode failed");
            } else if ( ret == 0 ) {
              delete packet;
              return 0;
            } // end if decode
          } // end if decoding
        } else {
          Debug(1, "No packet.size(%d) or packet->in_frame(%p). Not decoding", packet->packet.size, packet->in_frame);
        }
        if ( packet->in_frame and !packet->image ) {
          capture_image = packet->image = new Image(camera_width, camera_height, camera->Colours(), camera->SubpixelOrder());
          packet->get_image();
        }
      } // end if need to decode

      if ( packet->image ) {
        capture_image = packet->image;

        /* Deinterlacing */
        if ( deinterlacing_value ) {
          if ( deinterlacing_value == 1 ) {
            capture_image->Deinterlace_Discard();
          } else if ( deinterlacing_value == 2 ) {
            capture_image->Deinterlace_Linear();
          } else if ( deinterlacing_value == 3 ) {
            capture_image->Deinterlace_Blend();
          } else if ( deinterlacing_value == 4 ) {
            capture_image->Deinterlace_4Field(next_buffer.image, (deinterlacing>>8)&0xff);
          } else if ( deinterlacing_value == 5 ) {
            capture_image->Deinterlace_Blend_CustomRatio((deinterlacing>>8)&0xff);
          }
        }

        if ( orientation != ROTATE_0 ) {
          Debug(2, "Doing rotation");
          switch ( orientation ) {
            case ROTATE_0 :
              // No action required
              break;
            case ROTATE_90 :
            case ROTATE_180 :
            case ROTATE_270 : 
              capture_image->Rotate((orientation-1)*90);
              break;
            case FLIP_HORI :
            case FLIP_VERT :
              capture_image->Flip(orientation==FLIP_HORI);
              break;
          }
        } // end if have rotation

        if ( privacy_bitmask ) {
          Debug(1, "Applying privacy");
          capture_image->MaskPrivacy(privacy_bitmask);
        }

        if ( config.timestamp_on_capture ) {
          Debug(1, "Timestampprivacy");
          TimestampImage(packet->image, packet->timestamp);
        }

        if ( !ref_image.Buffer() ) {
          // First image, so assign it to ref image
          Debug(1, "Assigning ref image %dx%d size: %d", width, height, camera->ImageSize());
          ref_image.Assign(width, height, camera->Colours(), camera->SubpixelOrder(),
              packet->image->Buffer(), camera->ImageSize());
        }
        image_buffer[index].image->Assign(*(packet->image));
        *(image_buffer[index].timestamp) = *(packet->timestamp);
      }  // end if have image

      shared_data->signal = ( capture_image and signal_check_points ) ? CheckSignal(capture_image) : true;
      shared_data->last_write_index = index;
      shared_data->last_write_time = packet->timestamp->tv_sec;
      image_count++;

      // Will only be queued if there are iterators allocated in the queue.
      if ( !packetqueue.queuePacket(packet) ) {
        delete packet;
      }
      UpdateCaptureFPS();
    } else { // result == 0
      // Question is, do we update last_write_index etc?
      delete packet;
      return 0;
    } // end if result
  } // end if deinterlacing

  // Icon: I'm not sure these should be here. They have nothing to do with capturing
  if ( shared_data->action & GET_SETTINGS ) {
    shared_data->brightness = camera->Brightness();
    shared_data->hue = camera->Hue();
    shared_data->colour = camera->Colour();
    shared_data->contrast = camera->Contrast();
    shared_data->action &= ~GET_SETTINGS;
  }
  if ( shared_data->action & SET_SETTINGS ) {
    camera->Brightness(shared_data->brightness);
    camera->Hue(shared_data->hue);
    camera->Colour(shared_data->colour);
    camera->Contrast(shared_data->contrast);
    shared_data->action &= ~SET_SETTINGS;
  }
  return captureResult;
} // end Monitor::Capture

void Monitor::TimestampImage(Image *ts_image, const struct timeval *ts_time) const {
  if ( !label_format[0] )
    return;

  // Expand the strftime macros first
  char label_time_text[256];
  strftime(label_time_text, sizeof(label_time_text), label_format, localtime(&ts_time->tv_sec));
  char label_text[1024];
  const char *s_ptr = label_time_text;
  char *d_ptr = label_text;
  while ( *s_ptr && ((d_ptr-label_text) < (unsigned int)sizeof(label_text)) ) {
    if ( *s_ptr == config.timestamp_code_char[0] ) {
      bool found_macro = false;
      switch ( *(s_ptr+1) ) {
        case 'N' :
          d_ptr += snprintf(d_ptr, sizeof(label_text)-(d_ptr-label_text), "%s", name);
          found_macro = true;
          break;
        case 'Q' :
          d_ptr += snprintf(d_ptr, sizeof(label_text)-(d_ptr-label_text), "%s", trigger_data->trigger_showtext);
          found_macro = true;
          break;
        case 'f' :
          d_ptr += snprintf(d_ptr, sizeof(label_text)-(d_ptr-label_text), "%02ld", ts_time->tv_usec/10000);
          found_macro = true;
          break;
      }
      if ( found_macro ) {
        s_ptr += 2;
        continue;
      }
    }
    *d_ptr++ = *s_ptr++;
  } // end while
  *d_ptr = '\0';
  Debug(2, "annotating %s", label_text);
  ts_image->Annotate(label_text, label_coord, label_size);
  Debug(2, "done annotating %s", label_text);
} // end void Monitor::TimestampImage

bool Monitor::closeEvent() {
  if ( !event )
    return false;

  delete event;
  event = nullptr;
  if ( shared_data )
    video_store_data->recording = {};
  return true;
} // end bool Monitor::closeEvent()

unsigned int Monitor::DetectMotion(const Image &comp_image, Event::StringSet &zoneSet) {
  bool alarm = false;
  unsigned int score = 0;

  if ( n_zones <= 0 ) return alarm;

  ref_image.Delta(comp_image, &delta_image);

  if ( config.record_diag_images ) {
    ref_image.WriteJpeg(diag_path_ref.c_str(), config.record_diag_images_fifo);
    delta_image.WriteJpeg(diag_path_delta.c_str(), config.record_diag_images_fifo);
  }

  // Blank out all exclusion zones
  for ( int n_zone = 0; n_zone < n_zones; n_zone++ ) {
    Zone *zone = zones[n_zone];
    // need previous alarmed state for preclusive zone, so don't clear just yet
    if ( !zone->IsPreclusive() )
      zone->ClearAlarm();
    if ( !zone->IsInactive() ) {
      continue;
    }
    Debug(3, "Blanking inactive zone %s", zone->Label());
    delta_image.Fill(kRGBBlack, zone->GetPolygon());
  } // end foreach zone

  // Check preclusive zones first
  for ( int n_zone = 0; n_zone < n_zones; n_zone++ ) {
    Zone *zone = zones[n_zone];
    if ( !zone->IsPreclusive() ) {
      continue;
    }
    int old_zone_score = zone->Score();
    bool old_zone_alarmed = zone->Alarmed();
    Debug(3, "Checking preclusive zone %s - old score: %d, state: %s",
        zone->Label(),old_zone_score, zone->Alarmed()?"alarmed":"quiet");
    if ( zone->CheckAlarms(&delta_image) ) {
      alarm = true;
      score += zone->Score();
      zone->SetAlarm();
      Debug(3, "Zone is alarmed, zone score = %d", zone->Score());
      zoneSet.insert(zone->Label());
      //zone->ResetStats();
    } else {
      // check if end of alarm
      if ( old_zone_alarmed ) {
        Debug(3, "Preclusive Zone %s alarm Ends. Previous score: %d",
            zone->Label(), old_zone_score);
        if ( old_zone_score > 0 ) {
          zone->SetExtendAlarmCount(zone->GetExtendAlarmFrames());
        }
        if ( zone->CheckExtendAlarmCount() ) {
          alarm = true;
          zone->SetAlarm();
        } else {
          zone->ClearAlarm();
        }
      }
    } // end if CheckAlarms
  } // end foreach zone

  Coord alarm_centre;
  int top_score = -1;

  if ( alarm ) {
    alarm = false;
    score = 0;
  } else {
    // Find all alarm pixels in active zones
    for ( int n_zone = 0; n_zone < n_zones; n_zone++ ) {
      Zone *zone = zones[n_zone];
      if ( !zone->IsActive() || zone->IsPreclusive()) {
        continue;
      }
      Debug(3, "Checking active zone %s", zone->Label());
      if ( zone->CheckAlarms(&delta_image) ) {
        alarm = true;
        score += zone->Score();
        zone->SetAlarm();
        Debug(3, "Zone is alarmed, zone score = %d", zone->Score());
        zoneSet.insert(zone->Label());
        if ( config.opt_control && track_motion ) {
          if ( (int)zone->Score() > top_score ) {
            top_score = zone->Score();
            alarm_centre = zone->GetAlarmCentre();
          }
        }
      }
    } // end foreach zone

    if ( alarm ) {
      for ( int n_zone = 0; n_zone < n_zones; n_zone++ ) {
        Zone *zone = zones[n_zone];
        // Wasn't this zone already checked above?
        if ( !zone->IsInclusive() ) {
          continue;
        }
        Debug(3, "Checking inclusive zone %s", zone->Label());
        if ( zone->CheckAlarms(&delta_image) ) {
          alarm = true;
          score += zone->Score();
          zone->SetAlarm();
          Debug(3, "Zone is alarmed, zone score = %d", zone->Score());
          zoneSet.insert( zone->Label() );
          if ( config.opt_control && track_motion ) {
            if ( zone->Score() > (unsigned int)top_score ) {
              top_score = zone->Score();
              alarm_centre = zone->GetAlarmCentre();
            }
          }
        } // end if CheckAlarm
      } // end foreach zone
    } else {
      // Find all alarm pixels in exclusive zones
      for ( int n_zone = 0; n_zone < n_zones; n_zone++ ) {
        Zone *zone = zones[n_zone];
        if ( !zone->IsExclusive() ) {
          continue;
        }
        Debug(3, "Checking exclusive zone %s", zone->Label());
        if ( zone->CheckAlarms(&delta_image) ) {
          alarm = true;
          score += zone->Score();
          zone->SetAlarm();
          Debug(3, "Zone is alarmed, zone score = %d", zone->Score());
          zoneSet.insert(zone->Label());
        }
      } // end foreach zone
    } // end if alarm or not
  } // end if alarm

  if ( top_score > 0 ) {
    shared_data->alarm_x = alarm_centre.X();
    shared_data->alarm_y = alarm_centre.Y();

    Info("Got alarm centre at %d,%d, at count %d",
        shared_data->alarm_x, shared_data->alarm_y, analysis_image_count);
  } else {
    shared_data->alarm_x = shared_data->alarm_y = -1;
  }

  // This is a small and innocent hack to prevent scores of 0 being returned in alarm state
  return score ? score : alarm;
} // end MotionDetect

// TODO: Move the camera specific things to the camera classes and avoid these casts.
bool Monitor::DumpSettings(char *output, bool verbose) {
  output[0] = 0;

  sprintf( output+strlen(output), "Id : %d\n", id );
  sprintf( output+strlen(output), "Name : %s\n", name );
  sprintf( output+strlen(output), "Type : %s\n", camera->IsLocal()?"Local":(camera->IsRemote()?"Remote":"File") );
#if ZM_HAS_V4L
  if ( camera->IsLocal() ) {
    LocalCamera* cam = static_cast<LocalCamera*>(camera.get());
    sprintf( output+strlen(output), "Device : %s\n", cam->Device().c_str() );
    sprintf( output+strlen(output), "Channel : %d\n", cam->Channel() );
    sprintf( output+strlen(output), "Standard : %d\n", cam->Standard() );
  } else
#endif // ZM_HAS_V4L
  if ( camera->IsRemote() ) {
    RemoteCamera* cam = static_cast<RemoteCamera*>(camera.get());
    sprintf( output+strlen(output), "Protocol : %s\n", cam->Protocol().c_str() );
    sprintf( output+strlen(output), "Host : %s\n", cam->Host().c_str() );
    sprintf( output+strlen(output), "Port : %s\n", cam->Port().c_str() );
    sprintf( output+strlen(output), "Path : %s\n", cam->Path().c_str() );
  } else if ( camera->IsFile() ) {
    FileCamera* cam = static_cast<FileCamera*>(camera.get());
    sprintf( output+strlen(output), "Path : %s\n", cam->Path() );
  }
#if HAVE_LIBAVFORMAT
  else if ( camera->IsFfmpeg() ) {
    FfmpegCamera* cam = static_cast<FfmpegCamera*>(camera.get());
    sprintf( output+strlen(output), "Path : %s\n", cam->Path().c_str() );
  }
#endif // HAVE_LIBAVFORMAT
  sprintf( output+strlen(output), "Width : %d\n", camera->Width() );
  sprintf( output+strlen(output), "Height : %d\n", camera->Height() );
#if ZM_HAS_V4L
  if ( camera->IsLocal() ) {
    LocalCamera* cam = static_cast<LocalCamera*>(camera.get());
    sprintf( output+strlen(output), "Palette : %d\n", cam->Palette() );
  }
#endif // ZM_HAS_V4L
  sprintf(output+strlen(output), "Colours : %d\n", camera->Colours() );
  sprintf(output+strlen(output), "Subpixel Order : %d\n", camera->SubpixelOrder() );
  sprintf(output+strlen(output), "Event Prefix : %s\n", event_prefix );
  sprintf(output+strlen(output), "Label Format : %s\n", label_format );
  sprintf(output+strlen(output), "Label Coord : %d,%d\n", label_coord.X(), label_coord.Y() );
  sprintf(output+strlen(output), "Label Size : %d\n", label_size );
  sprintf(output+strlen(output), "Image Buffer Count : %d\n", image_buffer_count );
  sprintf(output+strlen(output), "Warmup Count : %d\n", warmup_count );
  sprintf(output+strlen(output), "Pre Event Count : %d\n", pre_event_count );
  sprintf(output+strlen(output), "Post Event Count : %d\n", post_event_count );
  sprintf(output+strlen(output), "Stream Replay Buffer : %d\n", stream_replay_buffer );
  sprintf(output+strlen(output), "Alarm Frame Count : %d\n", alarm_frame_count );
  sprintf(output+strlen(output), "Section Length : %d\n", section_length);
  sprintf(output+strlen(output), "Min Section Length : %d\n", min_section_length);
  sprintf(output+strlen(output), "Maximum FPS : %.2f\n", capture_delay?(double)DT_PREC_3/capture_delay:0.0);
  sprintf(output+strlen(output), "Alarm Maximum FPS : %.2f\n", alarm_capture_delay?(double)DT_PREC_3/alarm_capture_delay:0.0);
  sprintf(output+strlen(output), "Reference Blend %%ge : %d\n", ref_blend_perc);
  sprintf(output+strlen(output), "Alarm Reference Blend %%ge : %d\n", alarm_ref_blend_perc);
  sprintf(output+strlen(output), "Track Motion : %d\n", track_motion);
  sprintf(output+strlen(output), "Function: %d - %s\n", function,
    function==NONE?"None":(
    function==MONITOR?"Monitor Only":(
    function==MODECT?"Motion Detection":(
    function==RECORD?"Continuous Record":(
    function==MOCORD?"Continuous Record with Motion Detection":(
    function==NODECT?"Externally Triggered only, no Motion Detection":"Unknown"
  ))))));
  sprintf(output+strlen(output), "Zones : %d\n", n_zones );
  for ( int i = 0; i < n_zones; i++ ) {
    zones[i]->DumpSettings(output+strlen(output), verbose);
  }
  return true;
} // bool Monitor::DumpSettings(char *output, bool verbose)

unsigned int Monitor::Colours() const { return camera->Colours(); }
unsigned int Monitor::SubpixelOrder() const { return camera->SubpixelOrder(); }

int Monitor::PrimeCapture() {
  int ret = camera->PrimeCapture();
  if ( ret > 0 ) {
    video_stream_id = camera->get_VideoStreamId();

    packetqueue.addStreamId(video_stream_id);

    audio_stream_id = camera->get_AudioStreamId();
    if ( audio_stream_id >= 0 ) {
      packetqueue.addStreamId(audio_stream_id);
      shared_data->audio_frequency = camera->getFrequency();
      shared_data->audio_channels = camera->getChannels();
    }

    Debug(2, "Video stream id is %d, audio is %d, minimum_packets to keep in buffer %d",
        video_stream_id, audio_stream_id, pre_event_buffer_count);

    if (rtsp_server) {
      if (video_stream_id >= 0) {
        AVStream *videoStream = camera->get_VideoStream();
        snprintf(shared_data->video_fifo_path, sizeof(shared_data->video_fifo_path)-1, "%s/video_fifo_%d.%s",
            staticConfig.PATH_SOCKS.c_str(),
            id,
            avcodec_get_name(videoStream->codecpar->codec_id));
        video_fifo = new Fifo(shared_data->video_fifo_path, true);
      }
      if (record_audio and (audio_stream_id >= 0)) {
        AVStream *audioStream = camera->get_AudioStream();
        snprintf(shared_data->audio_fifo_path, sizeof(shared_data->audio_fifo_path)-1, "%s/video_fifo_%d.%s",
            staticConfig.PATH_SOCKS.c_str(), id,
            avcodec_get_name(audioStream->codecpar->codec_id));
        audio_fifo = new Fifo(shared_data->audio_fifo_path, true);
      }
    }  // end if rtsp_server
  } else {
    Debug(2, "Failed to prime %d", ret);
  }
  return ret;
}  // end int Monitor::PrimeCapture()

int Monitor::PreCapture() const { return camera->PreCapture(); }
int Monitor::PostCapture() const { return camera->PostCapture(); }
int Monitor::Close() {
  std::lock_guard<std::mutex> lck(event_mutex);
  if (event) {
    Info("%s: image_count:%d - Closing event %" PRIu64 ", shutting down", name, image_count, event->Id());
    closeEvent();
  }
  if (camera) camera->Close();
  packetqueue.clear();
  return 1;
}

Monitor::Orientation Monitor::getOrientation() const { return orientation; }

// Wait for camera to get an image, and then assign it as the base reference image.
// So this should be done as the first task in the analysis thread startup.
// This function is deprecated.
void Monitor::get_ref_image() {
  ZMPacket *snap = nullptr;

  if ( !analysis_it ) 
    analysis_it = packetqueue.get_video_it(true);

  while ( 
      (
       !( snap = packetqueue.get_packet(analysis_it))
       or 
       ( snap->packet.stream_index != video_stream_id )
       or
       ! snap->image
      )
    and !zm_terminate) {

    Debug(1, "Waiting for capture daemon lastwriteindex(%d) lastwritetime(%d)",
        shared_data->last_write_index, shared_data->last_write_time);
    if ( snap and ! snap->image ) {
      snap->unlock();
      // can't analyse it anyways, incremement
      packetqueue.increment_it(analysis_it);
    }
    //usleep(10000);
  }
  if ( zm_terminate )
    return;

  Debug(1, "get_ref_image: packet.stream %d ?= video_stream %d, packet image id %d packet image %p",
      snap->packet.stream_index, video_stream_id, snap->image_index, snap->image );
  // Might not have been decoded yet FIXME
  if ( snap->image ) {
    ref_image.Assign(width, height, camera->Colours(),
        camera->SubpixelOrder(), snap->image->Buffer(), camera->ImageSize());
    Debug(2, "Have ref image about to unlock");
  } else {
    Debug(2, "Have no ref image about to unlock");
  }
  snap->unlock();
}

std::vector<Group *> Monitor::Groups() {
  // At the moment, only load groups once.
  if ( !groups.size() ) {
    std::string sql = stringtf(
        "SELECT `Id`, `ParentId`, `Name` FROM `Groups` WHERE `Groups.Id` IN "
        "(SELECT `GroupId` FROM `Groups_Monitors` WHERE `MonitorId`=%d)", id);
    MYSQL_RES *result = zmDbFetch(sql.c_str());
    if ( !result ) {
      Error("Can't load groups: %s", mysql_error(&dbconn));
      return groups;
    }
    int n_groups = mysql_num_rows(result);
    Debug(1, "Got %d groups", n_groups);
    while ( MYSQL_ROW dbrow = mysql_fetch_row(result) ) {
      groups.push_back(new Group(dbrow));
    }
    if ( mysql_errno(&dbconn) ) {
      Error("Can't fetch row: %s", mysql_error(&dbconn));
    }
    mysql_free_result(result);
  }
  return groups;
} // end Monitor::Groups()

StringVector Monitor::GroupNames() {
  StringVector groupnames;
  for ( Group * g: Groups() ) {
    groupnames.push_back(std::string(g->Name()));
    Debug(1,"Groups: %s", g->Name());
  }
  return groupnames;
} // end Monitor::GroupNames()