zoneminder/src/zm_event.cpp

//
// ZoneMinder Event 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 <fcntl.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <sys/un.h>
#include <sys/uio.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <getopt.h>
#include <arpa/inet.h>
#include <glob.h>

#include "zm.h"
#include "zm_db.h"
#include "zm_time.h"
#include "zm_mpeg.h"
#include "zm_signal.h"
#include "zm_event.h"
#include "zm_monitor.h"

// sendfile tricks
extern "C"
{
#include "zm_sendfile.h"
}

#if HAVE_SYS_SENDFILE_H
#include <sys/sendfile.h>
#endif

//#define USE_PREPARED_SQL 1

bool Event::initialised = false;
char Event::capture_file_format[PATH_MAX];
char Event::analyse_file_format[PATH_MAX];
char Event::general_file_format[PATH_MAX];
char Event::video_file_format[PATH_MAX];

int Event::pre_alarm_count = 0;
Event::PreAlarmData Event::pre_alarm_data[MAX_PRE_ALARM_FRAMES] = { { 0 } };

Event::Event( Monitor *p_monitor, struct timeval p_start_time, const std::string &p_cause, const StringSetMap &p_noteSetMap, bool p_videoEvent ) :
  monitor( p_monitor ),
  start_time( p_start_time ),
  cause( p_cause ),
  noteSetMap( p_noteSetMap ),
  videoEvent( p_videoEvent ),
  videowriter( NULL )
{
  if ( !initialised )
    Initialise();

  std::string notes;
  createNotes( notes );

  bool untimedEvent = false;
  if ( !start_time.tv_sec ) {
    untimedEvent = true;
    gettimeofday( &start_time, 0 );
  }

  static char sql[ZM_SQL_MED_BUFSIZ];

  struct tm *stime = localtime( &start_time.tv_sec );
  snprintf( sql, sizeof(sql), "insert into Events ( MonitorId, Name, StartTime, Width, Height, Cause, Notes, Videoed ) values ( %d, 'New Event', from_unixtime( %ld ), %d, %d, '%s', '%s', '%d' )", monitor->Id(), start_time.tv_sec, monitor->Width(), monitor->Height(), cause.c_str(), notes.c_str(), videoEvent );
  if ( mysql_query( &dbconn, sql ) ) {
    Error( "Can't insert event: %s. sql was (%s)", mysql_error( &dbconn ), sql );
    exit( mysql_errno( &dbconn ) );
  }
  id = mysql_insert_id( &dbconn );
  if ( untimedEvent ) {
    Warning( "Event %d has zero time, setting to current", id );
  }
  end_time.tv_sec = 0;
  frames = 0;
  alarm_frames = 0;
  tot_score = 0;
  max_score = 0;

  struct stat statbuf;
  char id_file[PATH_MAX];

  if ( config.use_deep_storage ) {
    char *path_ptr = path;
    path_ptr += snprintf( path_ptr, sizeof(path), "%s/%d", config.dir_events, monitor->Id() );

    int dt_parts[6];
    dt_parts[0] = stime->tm_year-100;
    dt_parts[1] = stime->tm_mon+1;
    dt_parts[2] = stime->tm_mday;
    dt_parts[3] = stime->tm_hour;
    dt_parts[4] = stime->tm_min;
    dt_parts[5] = stime->tm_sec;

    char date_path[PATH_MAX] = "";
    char time_path[PATH_MAX] = "";
    char *time_path_ptr = time_path;
    for ( unsigned int i = 0; i < sizeof(dt_parts)/sizeof(*dt_parts); i++ ) {
      path_ptr += snprintf( path_ptr, sizeof(path)-(path_ptr-path), "/%02d", dt_parts[i] );

      errno = 0;
      if ( stat( path, &statbuf ) ) {
        if ( errno == ENOENT || errno == ENOTDIR ) {
          if ( mkdir( path, 0755 ) ) {
            Fatal( "Can't mkdir %s: %s", path, strerror(errno));
          }
        } else {
          Warning( "Error stat'ing %s, may be fatal. error is %s", path, strerror(errno));
        }
      }
      if ( i == 2 )
        strncpy( date_path, path, sizeof(date_path) );
      else if ( i >= 3 )
        time_path_ptr += snprintf( time_path_ptr, sizeof(time_path)-(time_path_ptr-time_path), "%s%02d", i>3?"/":"", dt_parts[i] );
    }
    // Create event id symlink
    snprintf( id_file, sizeof(id_file), "%s/.%d", date_path, id );
    if ( symlink( time_path, id_file ) < 0 )
      Fatal( "Can't symlink %s -> %s: %s", id_file, path, strerror(errno));
  } else {
    snprintf( path, sizeof(path), "%s/%d/%d", config.dir_events, monitor->Id(), id );

    errno = 0;
    stat( path, &statbuf );
    if ( errno == ENOENT || errno == ENOTDIR ) {
      if ( mkdir( path, 0755 ) ) {
        Error( "Can't mkdir %s: %s", path, strerror(errno));
      }
    }
  } // deep storage or not

  // Create empty id tag file
  snprintf( id_file, sizeof(id_file), "%s/.%d", path, id );
  if ( FILE *id_fp = fopen( id_file, "w" ) )
    fclose( id_fp );
  else
    Fatal( "Can't fopen %s: %s", id_file, strerror(errno));

  last_db_frame = 0;

  video_name[0] = 0;

  /* Save as video */

  if ( monitor->GetOptVideoWriter() != 0 ) {
    snprintf( video_name, sizeof(video_name), "%d-%s", id, "video.mp4" );
    snprintf( video_file, sizeof(video_file), video_file_format, path, video_name );

    /* X264 MP4 video writer */
    if ( monitor->GetOptVideoWriter() == Monitor::X264ENCODE ) {
#if ZM_HAVE_VIDEOWRITER_X264MP4
      videowriter = new X264MP4Writer(video_file, monitor->Width(), monitor->Height(), monitor->Colours(), monitor->SubpixelOrder(), monitor->GetOptEncoderParams());
#else
      Error("ZoneMinder was not compiled with the X264 MP4 video writer, check dependencies (x264 and mp4v2)");
#endif
    }

    if ( videowriter != NULL ) {
      /* Open the video stream */
      int nRet = videowriter->Open();
      if(nRet != 0) {
        Error("Failed opening video stream");
        delete videowriter;
        videowriter = NULL;
      }

      snprintf( timecodes_name, sizeof(timecodes_name), "%d-%s", id, "video.timecodes" );
      snprintf( timecodes_file, sizeof(timecodes_file), video_file_format, path, timecodes_name );

      /* Create timecodes file */
      timecodes_fd = fopen(timecodes_file, "wb");
      if ( timecodes_fd == NULL ) {
        Error("Failed creating timecodes file");
      }
    }
  } else {
    /* No video object */
    videowriter = NULL;
  }

} // Event::Event( Monitor *p_monitor, struct timeval p_start_time, const std::string &p_cause, const StringSetMap &p_noteSetMap, bool p_videoEvent )

Event::~Event() {
  static char sql[ZM_SQL_MED_BUFSIZ];
  struct DeltaTimeval delta_time;
  DELTA_TIMEVAL( delta_time, end_time, start_time, DT_PREC_2 );

  if ( frames > last_db_frame ) {

    Debug( 1, "Adding closing frame %d to DB", frames );
    snprintf( sql, sizeof(sql), "insert into Frames ( EventId, FrameId, TimeStamp, Delta ) values ( %d, %d, from_unixtime( %ld ), %s%ld.%02ld )", id, frames, end_time.tv_sec, delta_time.positive?"":"-", delta_time.sec, delta_time.fsec );
    if ( mysql_query( &dbconn, sql ) ) {
      Error( "Can't insert frame: %s", mysql_error( &dbconn ) );
      exit( mysql_errno( &dbconn ) );
    }
  }

  /* Close the video file */
  if ( videowriter != NULL ) {
    int nRet = videowriter->Close();
    if(nRet != 0) {
      Error("Failed closing video stream");
    }
    delete videowriter;
    videowriter = NULL;

    /* Close the timecodes file */
    fclose(timecodes_fd);
    timecodes_fd = NULL;
  }

  snprintf( sql, sizeof(sql), "update Events set Name='%s%d', EndTime = from_unixtime( %ld ), Length = %s%ld.%02ld, Frames = %d, AlarmFrames = %d, TotScore = %d, AvgScore = %d, MaxScore = %d, DefaultVideo = '%s' where Id = %d", monitor->EventPrefix(), id, end_time.tv_sec, delta_time.positive?"":"-", delta_time.sec, delta_time.fsec, frames, alarm_frames, tot_score, (int)(alarm_frames?(tot_score/alarm_frames):0), max_score, video_name, id );
  if ( mysql_query( &dbconn, sql ) ) {
    Error( "Can't update event: %s", mysql_error( &dbconn ) );
    exit( mysql_errno( &dbconn ) );
  }
}

void Event::createNotes( std::string &notes ) {
  notes.clear();
  for ( StringSetMap::const_iterator mapIter = noteSetMap.begin(); mapIter != noteSetMap.end(); mapIter++ ) {
    notes += mapIter->first;
    notes += ": ";
    const StringSet &stringSet = mapIter->second;
    for ( StringSet::const_iterator setIter = stringSet.begin(); setIter != stringSet.end(); setIter++ ) {
      if ( setIter != stringSet.begin() )
        notes += ", ";
      notes += *setIter;
    }
  }
}

int Event::sd = -1;

bool Event::WriteFrameImage( Image *image, struct timeval timestamp, const char *event_file, bool alarm_frame ) {
  Image* ImgToWrite;
  Image* ts_image = NULL;

  if ( !config.timestamp_on_capture )  // stash the image we plan to use in another pointer regardless if timestamped.
  {
    ts_image = new Image(*image);
    monitor->TimestampImage( ts_image, &timestamp );
    ImgToWrite=ts_image;
  } else
    ImgToWrite=image;

  int thisquality = ( alarm_frame && (config.jpeg_alarm_file_quality > config.jpeg_file_quality) ) ? config.jpeg_alarm_file_quality : 0 ;   // quality to use, zero is default
  ImgToWrite->WriteJpeg( event_file, thisquality, (monitor->Exif() ? timestamp : (timeval){0,0}) ); // exif is only timestamp at present this switches on or off for write

  if(ts_image) delete(ts_image); // clean up if used.
  return( true );
}

bool Event::WriteFrameVideo( const Image *image, const struct timeval timestamp, VideoWriter* videow ) {
  const Image* frameimg = image;
  Image ts_image;

  /* Checking for invalid parameters */
  if ( videow == NULL ) {
    Error("NULL Video object");
    return false;
  }

  /* If the image does not contain a timestamp, add the timestamp */
  if (!config.timestamp_on_capture) {
    ts_image = *image;
    monitor->TimestampImage( &ts_image, &timestamp );
    frameimg = &ts_image;
  }

  /* Calculate delta time */
  struct DeltaTimeval delta_time3;
  DELTA_TIMEVAL( delta_time3, timestamp, start_time, DT_PREC_3 );
  unsigned int timeMS = (delta_time3.sec * delta_time3.prec) + delta_time3.fsec;

  /* Encode and write the frame */
  if(videowriter->Encode(frameimg, timeMS) != 0) {
    Error("Failed encoding video frame");
  }

  /* Add the frame to the timecodes file */
  fprintf(timecodes_fd, "%u\n", timeMS);

  return( true );
}

void Event::updateNotes( const StringSetMap &newNoteSetMap ) {
  bool update = false;

  //Info( "Checking notes, %d <> %d", noteSetMap.size(), newNoteSetMap.size() );
  if ( newNoteSetMap.size() > 0 ) {
    if ( noteSetMap.size() == 0 ) {
      noteSetMap = newNoteSetMap;
      update = true;
    } else {
      for ( StringSetMap::const_iterator newNoteSetMapIter = newNoteSetMap.begin(); newNoteSetMapIter != newNoteSetMap.end(); newNoteSetMapIter++ ) {
        const std::string &newNoteGroup = newNoteSetMapIter->first;
        const StringSet &newNoteSet = newNoteSetMapIter->second;
        //Info( "Got %d new strings", newNoteSet.size() );
        if ( newNoteSet.size() > 0 ) {
          StringSetMap::iterator noteSetMapIter = noteSetMap.find( newNoteGroup );
          if ( noteSetMapIter == noteSetMap.end() ) {
            //Info( "Can't find note group %s, copying %d strings", newNoteGroup.c_str(), newNoteSet.size() );
            noteSetMap.insert( StringSetMap::value_type( newNoteGroup, newNoteSet ) );
            update = true;
          } else {
            StringSet &noteSet = noteSetMapIter->second;
            //Info( "Found note group %s, got %d strings", newNoteGroup.c_str(), newNoteSet.size() );
            for ( StringSet::const_iterator newNoteSetIter = newNoteSet.begin(); newNoteSetIter != newNoteSet.end(); newNoteSetIter++ ) {
              const std::string &newNote = *newNoteSetIter;
              StringSet::iterator noteSetIter = noteSet.find( newNote );
              if ( noteSetIter == noteSet.end() ) {
                noteSet.insert( newNote );
                update = true;
              }
            } // end for
          } // end if ( noteSetMap.size() == 0
        } // end if newNoteSetupMap.size() > 0
      } // end foreach newNoteSetMap
    } // end if have old notes
  } // end if have new notes

  if ( update ) {
    std::string notes;
    createNotes( notes );

    Debug( 2, "Updating notes for event %d, '%s'", id, notes.c_str() );
    static char sql[ZM_SQL_MED_BUFSIZ];
#if USE_PREPARED_SQL
    static MYSQL_STMT *stmt = 0;

    char notesStr[ZM_SQL_MED_BUFSIZ] = "";
    unsigned long notesLen = 0;

    if ( !stmt ) {
      const char *sql = "update Events set Notes = ? where Id = ?";

      stmt = mysql_stmt_init( &dbconn );
      if ( mysql_stmt_prepare( stmt, sql, strlen(sql) ) ) {
        Fatal( "Unable to prepare sql '%s': %s", sql, mysql_stmt_error(stmt) );
      }

      /* Get the parameter count from the statement */
      if ( mysql_stmt_param_count( stmt ) != 2 ) {
        Fatal( "Unexpected parameter count %ld in sql '%s'", mysql_stmt_param_count( stmt ), sql );
      }

      MYSQL_BIND  bind[2];
      memset(bind, 0, sizeof(bind));

      /* STRING PARAM */
      bind[0].buffer_type = MYSQL_TYPE_STRING;
      bind[0].buffer = (char *)notesStr;
      bind[0].buffer_length = sizeof(notesStr);
      bind[0].is_null = 0;
      bind[0].length = &notesLen;

      bind[1].buffer_type= MYSQL_TYPE_LONG;
      bind[1].buffer= (char *)&id;
      bind[1].is_null= 0;
      bind[1].length= 0;

      /* Bind the buffers */
      if ( mysql_stmt_bind_param( stmt, bind ) ) {
        Fatal( "Unable to bind sql '%s': %s", sql, mysql_stmt_error(stmt) );
      }
    }

    strncpy( notesStr, notes.c_str(), sizeof(notesStr) );
    notesLen = notes.length();

    if ( mysql_stmt_execute( stmt ) ) {
      Fatal( "Unable to execute sql '%s': %s", sql, mysql_stmt_error(stmt) );
    }
#else
    static char escapedNotes[ZM_SQL_MED_BUFSIZ];

    mysql_real_escape_string( &dbconn, escapedNotes, notes.c_str(), notes.length() );

    snprintf( sql, sizeof(sql), "update Events set Notes = '%s' where Id = %d", escapedNotes, id );
    if ( mysql_query( &dbconn, sql ) ) {
      Error( "Can't insert event: %s", mysql_error( &dbconn ) );
    }
#endif
  }
}

void Event::AddFrames( int n_frames, Image **images, struct timeval **timestamps ) {
  for (int i = 0; i < n_frames; i += ZM_SQL_BATCH_SIZE) {
    AddFramesInternal(n_frames, i, images, timestamps);
  }
}

void Event::AddFramesInternal( int n_frames, int start_frame, Image **images, struct timeval **timestamps ) {
  static char sql[ZM_SQL_LGE_BUFSIZ];
  strncpy( sql, "insert into Frames ( EventId, FrameId, TimeStamp, Delta ) values ", sizeof(sql) );
  int frameCount = 0;
  for ( int i = start_frame; i < n_frames && i - start_frame < ZM_SQL_BATCH_SIZE; i++ ) {
    if ( !timestamps[i]->tv_sec ) {
      Debug( 1, "Not adding pre-capture frame %d, zero timestamp", i );
      continue;
    }

    frames++;

    static char event_file[PATH_MAX];
    snprintf( event_file, sizeof(event_file), capture_file_format, path, frames );
    if ( monitor->GetOptSaveJPEGs() & 4) {
      //If this is the first frame, we should add a thumbnail to the event directory
      if(frames == 10){
        char snapshot_file[PATH_MAX];
        snprintf( snapshot_file, sizeof(snapshot_file), "%s/snapshot.jpg", path );
        WriteFrameImage( images[i], *(timestamps[i]), snapshot_file );
      }
    }
    if ( monitor->GetOptSaveJPEGs() & 1) {
      Debug( 1, "Writing pre-capture frame %d", frames );
      WriteFrameImage( images[i], *(timestamps[i]), event_file );
    }
    if ( videowriter != NULL ) {
      WriteFrameVideo( images[i], *(timestamps[i]), videowriter );
    }

    struct DeltaTimeval delta_time;
    DELTA_TIMEVAL( delta_time, *(timestamps[i]), start_time, DT_PREC_2 );

    int sql_len = strlen(sql);
    snprintf( sql+sql_len, sizeof(sql)-sql_len, "( %d, %d, from_unixtime(%ld), %s%ld.%02ld ), ", id, frames, timestamps[i]->tv_sec, delta_time.positive?"":"-", delta_time.sec, delta_time.fsec );

    frameCount++;
  }

  if ( frameCount ) {
    Debug( 1, "Adding %d/%d frames to DB", frameCount, n_frames );
    *(sql+strlen(sql)-2) = '\0';
    if ( mysql_query( &dbconn, sql ) ) {
      Error( "Can't insert frames: %s", mysql_error( &dbconn ) );
      exit( mysql_errno( &dbconn ) );
    }
    last_db_frame = frames;
  } else {
    Debug( 1, "No valid pre-capture frames to add" );
  }
}

void Event::AddFrame( Image *image, struct timeval timestamp, int score, Image *alarm_image ) {
  if ( !timestamp.tv_sec ) {
    Debug( 1, "Not adding new frame, zero timestamp" );
    return;
  }

  frames++;

  static char event_file[PATH_MAX];
  snprintf( event_file, sizeof(event_file), capture_file_format, path, frames );

  if ( monitor->GetOptSaveJPEGs() & 4) {
    //If this is the first frame, we should add a thumbnail to the event directory
    if(frames == 10){
      char snapshot_file[PATH_MAX];
      snprintf( snapshot_file, sizeof(snapshot_file), "%s/snapshot.jpg", path );
      WriteFrameImage( image, timestamp, snapshot_file );
    }
  }
  if( monitor->GetOptSaveJPEGs() & 1) {
    Debug( 1, "Writing capture frame %d", frames );
    WriteFrameImage( image, timestamp, event_file );
  }
  if ( videowriter != NULL ) {
    WriteFrameVideo( image, timestamp, videowriter );
  }

  struct DeltaTimeval delta_time;
  DELTA_TIMEVAL( delta_time, timestamp, start_time, DT_PREC_2 );

  const char *frame_type = score>0?"Alarm":(score<0?"Bulk":"Normal");
  if ( score < 0 )
    score = 0;

  bool db_frame = (strcmp(frame_type,"Bulk") != 0) || ((frames%config.bulk_frame_interval)==0) || !frames;
  if ( db_frame ) {

    Debug( 1, "Adding frame %d of type \"%s\" to DB", frames, frame_type );
    static char sql[ZM_SQL_MED_BUFSIZ];
    snprintf( sql, sizeof(sql), "insert into Frames ( EventId, FrameId, Type, TimeStamp, Delta, Score ) values ( %d, %d, '%s', from_unixtime( %ld ), %s%ld.%02ld, %d )", id, frames, frame_type, timestamp.tv_sec, delta_time.positive?"":"-", delta_time.sec, delta_time.fsec, score );
    if ( mysql_query( &dbconn, sql ) ) {
      Error( "Can't insert frame: %s", mysql_error( &dbconn ) );
      exit( mysql_errno( &dbconn ) );
    }
    last_db_frame = frames;

    // We are writing a Bulk frame
    if ( !strcmp( frame_type,"Bulk") ) {
      snprintf( sql, sizeof(sql), "update Events set Length = %s%ld.%02ld, Frames = %d, AlarmFrames = %d, TotScore = %d, AvgScore = %d, MaxScore = %d where Id = %d", 
          ( delta_time.positive?"":"-" ),
          delta_time.sec, delta_time.fsec,
          frames, 
          alarm_frames,
          tot_score,
          (int)(alarm_frames?(tot_score/alarm_frames):0),
          max_score,
          id
          );
      if ( mysql_query( &dbconn, sql ) ) {
        Error( "Can't update event: %s", mysql_error( &dbconn ) );
        exit( mysql_errno( &dbconn ) );
      }
    }
  }

  end_time = timestamp;

  // We are writing an Alarm frame
  if ( !strcmp( frame_type,"Alarm") ) {
    alarm_frames++;

    tot_score += score;
    if ( score > (int)max_score )
      max_score = score;

    if ( alarm_image ) {
      snprintf( event_file, sizeof(event_file), analyse_file_format, path, frames );

      Debug( 1, "Writing analysis frame %d", frames );
      if ( monitor->GetOptSaveJPEGs() & 2) {
        WriteFrameImage( alarm_image, timestamp, event_file, true );
      }
    }
  }

  /* This makes viewing the diagnostic images impossible because it keeps deleting them
  if ( config.record_diag_images ) {
    char diag_glob[PATH_MAX] = "";

    snprintf( diag_glob, sizeof(diag_glob), "%s/%d/diag-*.jpg", config.dir_events, monitor->Id() );
    glob_t pglob;
    int glob_status = glob( diag_glob, 0, 0, &pglob );
    if ( glob_status != 0 ) {
      if ( glob_status < 0 ) {
        Error( "Can't glob '%s': %s", diag_glob, strerror(errno) );
      } else {
        Debug( 1, "Can't glob '%s': %d", diag_glob, glob_status );
      }
    } else {
      char new_diag_path[PATH_MAX] = "";
      for ( int i = 0; i < pglob.gl_pathc; i++ ) {
        char *diag_path = pglob.gl_pathv[i];

        char *diag_file = strstr( diag_path, "diag-" );

        if ( diag_file ) {
          snprintf( new_diag_path, sizeof(new_diag_path), general_file_format, path, frames, diag_file );

          if ( rename( diag_path, new_diag_path ) < 0 ) {
            Error( "Can't rename '%s' to '%s': %s", diag_path, new_diag_path, strerror(errno) );
          }
        }
      }
    }
    globfree( &pglob );
  }
  */
}

bool EventStream::loadInitialEventData( int monitor_id, time_t event_time ) {
  static char sql[ZM_SQL_SML_BUFSIZ];

  snprintf( sql, sizeof(sql), "select Id from Events where MonitorId = %d and unix_timestamp( EndTime ) > %ld order by Id asc limit 1", monitor_id, event_time );

  if ( mysql_query( &dbconn, sql ) ) {
    Error( "Can't run query: %s", mysql_error( &dbconn ) );
    exit( mysql_errno( &dbconn ) );
  }

  MYSQL_RES *result = mysql_store_result( &dbconn );
  if ( !result ) {
    Error( "Can't use query result: %s", mysql_error( &dbconn ) );
    exit( mysql_errno( &dbconn ) );
  }
  MYSQL_ROW dbrow = mysql_fetch_row( result );

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

  int init_event_id = atoi( dbrow[0] );

  mysql_free_result( result );

  loadEventData( init_event_id );

  if ( event_time ) {
    curr_stream_time = event_time;
    curr_frame_id = 1;
    if ( event_time >= event_data->start_time ) {
      for (unsigned int i = 0; i < event_data->frame_count; i++ ) {
        //Info( "eft %d > et %d", event_data->frames[i].timestamp, event_time );
        if ( event_data->frames[i].timestamp >= event_time ) {
          curr_frame_id = i+1;
          Debug( 3, "Set cst:%.2f", curr_stream_time );
          Debug( 3, "Set cfid:%d", curr_frame_id );
          break;
        }
      }
      Debug( 3, "Skipping %ld frames", event_data->frame_count );
    }
  }
  return( true );
}

bool EventStream::loadInitialEventData( int init_event_id, unsigned int init_frame_id ) {
  loadEventData( init_event_id );

  if ( init_frame_id ) {
    curr_stream_time = event_data->frames[init_frame_id-1].timestamp;
    curr_frame_id = init_frame_id;
  } else {
    curr_stream_time = event_data->start_time;
  }

  return( true );
}

bool EventStream::loadEventData( int event_id ) {
  static char sql[ZM_SQL_MED_BUFSIZ];

  snprintf( sql, sizeof(sql), "SELECT MonitorId, Frames, unix_timestamp( StartTime ) AS StartTimestamp, (SELECT max(Delta)-min(Delta) FROM Frames WHERE EventId=Events.Id) AS Duration, DefaultVideo FROM Events WHERE Id = %d", event_id );

  if ( mysql_query( &dbconn, sql ) ) {
    Error( "Can't run query: %s", mysql_error( &dbconn ) );
    exit( mysql_errno( &dbconn ) );
  }

  MYSQL_RES *result = mysql_store_result( &dbconn );
  if ( !result ) {
    Error( "Can't use query result: %s", mysql_error( &dbconn ) );
    exit( mysql_errno( &dbconn ) );
  }

  if ( !mysql_num_rows( result ) ) {
    Fatal( "Unable to load event %d, not found in DB", event_id );
  }

  MYSQL_ROW dbrow = mysql_fetch_row( result );

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

  delete event_data;
  event_data = new EventData;
  event_data->event_id = event_id;
  event_data->monitor_id = atoi( dbrow[0] );
  event_data->start_time = atoi(dbrow[2]);
  if ( config.use_deep_storage ) {
    struct tm *event_time = localtime( &event_data->start_time );
    if ( config.dir_events[0] == '/' )
      snprintf( event_data->path, sizeof(event_data->path), "%s/%ld/%02d/%02d/%02d/%02d/%02d/%02d", config.dir_events, event_data->monitor_id, event_time->tm_year-100, event_time->tm_mon+1, event_time->tm_mday, event_time->tm_hour, event_time->tm_min, event_time->tm_sec );
    else
      snprintf( event_data->path, sizeof(event_data->path), "%s/%s/%ld/%02d/%02d/%02d/%02d/%02d/%02d", staticConfig.PATH_WEB.c_str(), config.dir_events, event_data->monitor_id, event_time->tm_year-100, event_time->tm_mon+1, event_time->tm_mday, event_time->tm_hour, event_time->tm_min, event_time->tm_sec );
  } else {
    if ( config.dir_events[0] == '/' )
      snprintf( event_data->path, sizeof(event_data->path), "%s/%ld/%ld", config.dir_events, event_data->monitor_id, event_data->event_id );
    else
      snprintf( event_data->path, sizeof(event_data->path), "%s/%s/%ld/%ld", staticConfig.PATH_WEB.c_str(), config.dir_events, event_data->monitor_id, event_data->event_id );
  }
  event_data->frame_count = dbrow[1] == NULL ? 0 : atoi(dbrow[1]);
  event_data->duration = atof(dbrow[3]);
  strncpy( event_data->video_file, dbrow[4], sizeof( event_data->video_file )-1 );

  updateFrameRate( (double)event_data->frame_count/event_data->duration );

  mysql_free_result( result );

  snprintf( sql, sizeof(sql), "select FrameId, unix_timestamp( `TimeStamp` ), Delta from Frames where EventId = %d order by FrameId asc", event_id );
  if ( mysql_query( &dbconn, sql ) ) {
    Error( "Can't run query: %s", mysql_error( &dbconn ) );
    exit( mysql_errno( &dbconn ) );
  }

  result = mysql_store_result( &dbconn );
  if ( !result ) {
    Error( "Can't use query result: %s", mysql_error( &dbconn ) );
    exit( mysql_errno( &dbconn ) );
  }

  event_data->n_frames = mysql_num_rows( result );

  event_data->frames = new FrameData[event_data->frame_count];
  int id, last_id = 0;
  time_t timestamp, last_timestamp = event_data->start_time;
  double delta, last_delta = 0.0;
  while ( ( dbrow = mysql_fetch_row( result ) ) ) {
    id = atoi(dbrow[0]);
    timestamp = atoi(dbrow[1]);
    delta = atof(dbrow[2]);
    int id_diff = id - last_id;
    double frame_delta = (delta-last_delta)/id_diff;
    if ( id_diff > 1 ) {
      for ( int i = last_id+1; i < id; i++ ) {
        event_data->frames[i-1].timestamp = (time_t)(last_timestamp + ((i-last_id)*frame_delta));
        event_data->frames[i-1].offset = (time_t)(event_data->frames[i-1].timestamp-event_data->start_time);
        event_data->frames[i-1].delta = frame_delta;
        event_data->frames[i-1].in_db = false;
      }
    }
    event_data->frames[id-1].timestamp = timestamp;
    event_data->frames[id-1].offset = (time_t)(event_data->frames[id-1].timestamp-event_data->start_time);
    event_data->frames[id-1].delta = id>1?frame_delta:0.0;
    event_data->frames[id-1].in_db = true;
    last_id = id;
    last_delta = delta;
    last_timestamp = timestamp;
  }
  if ( mysql_errno( &dbconn ) ) {
    Error( "Can't fetch row: %s", mysql_error( &dbconn ) );
    exit( mysql_errno( &dbconn ) );
  }

  //for ( int i = 0; i < 250; i++ )
  //{
    //Info( "%d -> %d @ %f (%d)", i+1, event_data->frames[i].timestamp, event_data->frames[i].delta, event_data->frames[i].in_db );
  //}

  mysql_free_result( result );

  if ( forceEventChange || mode == MODE_ALL_GAPLESS ) {
    if ( replay_rate > 0 )
      curr_stream_time = event_data->frames[0].timestamp;
    else
      curr_stream_time = event_data->frames[event_data->frame_count-1].timestamp;
  }
  Debug( 2, "Event:%ld, Frames:%ld, Duration: %.2f", event_data->event_id, event_data->frame_count, event_data->duration );

  return( true );
}

void EventStream::processCommand( const CmdMsg *msg ) {
  Debug( 2, "Got message, type %d, msg %d", msg->msg_type, msg->msg_data[0] );
  // Check for incoming command
  switch( (MsgCommand)msg->msg_data[0] ) {
    case CMD_PAUSE :
      {
        Debug( 1, "Got PAUSE command" );

        // Set paused flag
        paused = true;
        replay_rate = ZM_RATE_BASE;
        last_frame_sent = TV_2_FLOAT( now );
        break;
      }
    case CMD_PLAY :
      {
        Debug( 1, "Got PLAY command" );
        if ( paused )
        {
          // Clear paused flag
          paused = false;
        }

        // If we are in single event mode and at the last frame, replay the current event
        if ( (mode == MODE_SINGLE) && ((unsigned int)curr_frame_id == event_data->frame_count) )
          curr_frame_id = 1;

        replay_rate = ZM_RATE_BASE;
        break;
      }
    case CMD_VARPLAY :
      {
        Debug( 1, "Got VARPLAY command" );
        if ( paused )
        {
          // Clear paused flag
          paused = false;
        }
        replay_rate = ntohs(((unsigned char)msg->msg_data[2]<<8)|(unsigned char)msg->msg_data[1])-32768;
        break;
      }
    case CMD_STOP :
      {
        Debug( 1, "Got STOP command" );

        // Clear paused flag
        paused = false;
        break;
      }
    case CMD_FASTFWD :
      {
        Debug( 1, "Got FAST FWD command" );
        if ( paused ) {
          // Clear paused flag
          paused = false;
        }
        // Set play rate
        switch ( replay_rate ) {
          case 2 * ZM_RATE_BASE :
            replay_rate = 5 * ZM_RATE_BASE;
            break;
          case 5 * ZM_RATE_BASE :
            replay_rate = 10 * ZM_RATE_BASE;
            break;
          case 10 * ZM_RATE_BASE :
            replay_rate = 25 * ZM_RATE_BASE;
            break;
          case 25 * ZM_RATE_BASE :
          case 50 * ZM_RATE_BASE :
            replay_rate = 50 * ZM_RATE_BASE;
            break;
          default :
            replay_rate = 2 * ZM_RATE_BASE;
            break;
        }
        break;
      }
    case CMD_SLOWFWD :
      {
        Debug( 1, "Got SLOW FWD command" );
        // Set paused flag
        paused = true;
        // Set play rate
        replay_rate = ZM_RATE_BASE;
        // Set step
        step = 1;
        break;
      }
    case CMD_SLOWREV :
      {
        Debug( 1, "Got SLOW REV command" );
        // Set paused flag
        paused = true;
        // Set play rate
        replay_rate = ZM_RATE_BASE;
        // Set step
        step = -1;
        break;
      }
    case CMD_FASTREV :
      {
        Debug( 1, "Got FAST REV command" );
        if ( paused ) {
          // Clear paused flag
          paused = false;
        }
        // Set play rate
        switch ( replay_rate ) {
          case -2 * ZM_RATE_BASE :
            replay_rate = -5 * ZM_RATE_BASE;
            break;
          case -5 * ZM_RATE_BASE :
            replay_rate = -10 * ZM_RATE_BASE;
            break;
          case -10 * ZM_RATE_BASE :
            replay_rate = -25 * ZM_RATE_BASE;
            break;
          case -25 * ZM_RATE_BASE :
          case -50 * ZM_RATE_BASE :
            replay_rate = -50 * ZM_RATE_BASE;
            break;
          default :
            replay_rate = -2 * ZM_RATE_BASE;
            break;
        }
        break;
      }
    case CMD_ZOOMIN :
      {
        x = ((unsigned char)msg->msg_data[1]<<8)|(unsigned char)msg->msg_data[2];
        y = ((unsigned char)msg->msg_data[3]<<8)|(unsigned char)msg->msg_data[4];
        Debug( 1, "Got ZOOM IN command, to %d,%d", x, y );
        switch ( zoom ) {
          case 100:
            zoom = 150;
            break;
          case 150:
            zoom = 200;
            break;
          case 200:
            zoom = 300;
            break;
          case 300:
            zoom = 400;
            break;
          case 400:
          default :
            zoom = 500;
            break;
        }
        break;
      }
    case CMD_ZOOMOUT :
      {
        Debug( 1, "Got ZOOM OUT command" );
        switch ( zoom ) {
          case 500:
            zoom = 400;
            break;
          case 400:
            zoom = 300;
            break;
          case 300:
            zoom = 200;
            break;
          case 200:
            zoom = 150;
            break;
          case 150:
          default :
            zoom = 100;
            break;
        }
        break;
      }
    case CMD_PAN :
      {
        x = ((unsigned char)msg->msg_data[1]<<8)|(unsigned char)msg->msg_data[2];
        y = ((unsigned char)msg->msg_data[3]<<8)|(unsigned char)msg->msg_data[4];
        Debug( 1, "Got PAN command, to %d,%d", x, y );
        break;
      }
    case CMD_SCALE :
      {
        scale = ((unsigned char)msg->msg_data[1]<<8)|(unsigned char)msg->msg_data[2];
        Debug( 1, "Got SCALE command, to %d", scale );
        break;
      }
    case CMD_PREV :
      {
        Debug( 1, "Got PREV command" );
        if ( replay_rate >= 0 )
          curr_frame_id = 0;
        else
          curr_frame_id = event_data->frame_count+1;
        paused = false;
        forceEventChange = true;
        break;
      }
    case CMD_NEXT :
      {
        Debug( 1, "Got NEXT command" );
        if ( replay_rate >= 0 )
          curr_frame_id = event_data->frame_count+1;
        else
          curr_frame_id = 0;
        paused = false;
        forceEventChange = true;
        break;
      }
    case CMD_SEEK :
      {
        int offset = ((unsigned char)msg->msg_data[1]<<24)|((unsigned char)msg->msg_data[2]<<16)|((unsigned char)msg->msg_data[3]<<8)|(unsigned char)msg->msg_data[4];
        curr_frame_id = (int)(event_data->frame_count*offset/event_data->duration);
        Debug( 1, "Got SEEK command, to %d (new cfid: %d)", offset, curr_frame_id );
        break;
      }
    case CMD_QUERY :
      {
        Debug( 1, "Got QUERY command, sending STATUS" );
        break;
      }
    case CMD_QUIT :
      {
        Info ("User initiated exit - CMD_QUIT");
        break;
      }
    default :
      {
        // Do nothing, for now
      }
  }
  struct {
    int event;
    int progress;
    int rate;
    int zoom;
    bool paused;
  } status_data;

  status_data.event = event_data->event_id;
  status_data.progress = (int)event_data->frames[curr_frame_id-1].offset;
  status_data.rate = replay_rate;
  status_data.zoom = zoom;
  status_data.paused = paused;
  Debug( 2, "E:%d, P:%d, p:%d R:%d, Z:%d",
    status_data.event,
    status_data.paused,
    status_data.progress,
    status_data.rate,
    status_data.zoom
  );

  DataMsg status_msg;
  status_msg.msg_type = MSG_DATA_EVENT;
  memcpy( &status_msg.msg_data, &status_data, sizeof(status_data) );
  if ( sendto( sd, &status_msg, sizeof(status_msg), MSG_DONTWAIT, (sockaddr *)&rem_addr, sizeof(rem_addr) ) < 0 ) {
    //if ( errno != EAGAIN )
    {
      Error( "Can't sendto on sd %d: %s", sd, strerror(errno) );
      exit( -1 );
    }
  }
  // quit after sending a status, if this was a quit request
  if ((MsgCommand)msg->msg_data[0]==CMD_QUIT)
    exit(0);

  updateFrameRate( (double)event_data->frame_count/event_data->duration );
}

void EventStream::checkEventLoaded() {
  bool reload_event = false;
  static char sql[ZM_SQL_SML_BUFSIZ];

  if ( curr_frame_id <= 0 ) {
    snprintf( sql, sizeof(sql), "select Id from Events where MonitorId = %ld and Id < %ld order by Id desc limit 1", event_data->monitor_id, event_data->event_id );
    reload_event = true;
  } else if ( (unsigned int)curr_frame_id > event_data->frame_count ) {
    snprintf( sql, sizeof(sql), "select Id from Events where MonitorId = %ld and Id > %ld order by Id asc limit 1", event_data->monitor_id, event_data->event_id );
    reload_event = true;
  }

  if ( reload_event ) {
    if ( forceEventChange || mode != MODE_SINGLE ) {
      //Info( "SQL:%s", sql );
      if ( mysql_query( &dbconn, sql ) ) {
        Error( "Can't run query: %s", mysql_error( &dbconn ) );
        exit( mysql_errno( &dbconn ) );
      }

      MYSQL_RES *result = mysql_store_result( &dbconn );
      if ( !result ) {
        Error( "Can't use query result: %s", mysql_error( &dbconn ) );
        exit( mysql_errno( &dbconn ) );
      }
      MYSQL_ROW dbrow = mysql_fetch_row( result );

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

      if ( dbrow ) {
        int event_id = atoi(dbrow[0]);
        Debug( 1, "Loading new event %d", event_id );

        loadEventData( event_id );

        Debug( 2, "Current frame id = %d", curr_frame_id );
        if ( replay_rate < 0 )
          curr_frame_id = event_data->frame_count;
        else
          curr_frame_id = 1;
        Debug( 2, "New frame id = %d", curr_frame_id );
      } else {
        if ( curr_frame_id <= 0 )
          curr_frame_id = 1;
        else
          curr_frame_id = event_data->frame_count;
        paused = true;
      }
      mysql_free_result( result );
      forceEventChange = false;
    } else {
      if ( curr_frame_id <= 0 )
        curr_frame_id = 1;
      else
        curr_frame_id = event_data->frame_count;
      paused = true;
    }
  }
}

bool EventStream::sendFrame( int delta_us ) {
  Debug( 2, "Sending frame %d", curr_frame_id );

  static char filepath[PATH_MAX];
  static struct stat filestat;
  FILE *fdj = NULL;

  // This needs to be abstracted.  If we are saving jpgs, then load the capture file.  If we are only saving analysis frames, then send that.
  if ( monitor->GetOptSaveJPEGs() & 1 ) {
    snprintf( filepath, sizeof(filepath), Event::capture_file_format, event_data->path, curr_frame_id );
  } else if ( monitor->GetOptSaveJPEGs() & 2 ) {
    snprintf( filepath, sizeof(filepath), Event::analyse_file_format, event_data->path, curr_frame_id );
    if ( stat( filepath, &filestat ) < 0 ) {
      Debug(1, "%s not found, dalling back to capture");
      snprintf( filepath, sizeof(filepath), Event::capture_file_format, event_data->path, curr_frame_id );
    }

  } else {
    Fatal("JPEGS not saved.zms is not capable of streaming jpegs from mp4 yet");
    return false;
  }

#if HAVE_LIBAVCODEC
  if ( type == STREAM_MPEG ) {
    Image image( filepath );

    Image *send_image = prepareImage( &image );

    if ( !vid_stream ) {
      vid_stream = new VideoStream( "pipe:", format, bitrate, effective_fps, send_image->Colours(), send_image->SubpixelOrder(), send_image->Width(), send_image->Height() );
      fprintf( stdout, "Content-type: %s\r\n\r\n", vid_stream->MimeType() );
      vid_stream->OpenStream();
    }
    /* double pts = */ vid_stream->EncodeFrame( send_image->Buffer(), send_image->Size(), config.mpeg_timed_frames, delta_us*1000 );
  } else
#endif // HAVE_LIBAVCODEC
  {
    static unsigned char temp_img_buffer[ZM_MAX_IMAGE_SIZE];

    int img_buffer_size = 0;
    uint8_t *img_buffer = temp_img_buffer;

    bool send_raw = ((scale>=ZM_SCALE_BASE)&&(zoom==ZM_SCALE_BASE));

    fprintf( stdout, "--ZoneMinderFrame\r\n" );

    if ( type != STREAM_JPEG )
      send_raw = false;

    if ( send_raw ) {
      fdj = fopen( filepath, "rb" );
      if ( !fdj ) {
        Error( "Can't open %s: %s", filepath, strerror(errno) );
        return( false );
      }
#if HAVE_SENDFILE
      if( fstat(fileno(fdj),&filestat) < 0 ) {
        Error( "Failed getting information about file %s: %s", filepath, strerror(errno) );
        return( false );
      }
#else
      img_buffer_size = fread( img_buffer, 1, sizeof(temp_img_buffer), fdj );
#endif
    } else {
      Image image( filepath );

      Image *send_image = prepareImage( &image );

      switch( type ) {
        case STREAM_JPEG :
          send_image->EncodeJpeg( img_buffer, &img_buffer_size );
          break;
        case STREAM_ZIP :
#if HAVE_ZLIB_H
          unsigned long zip_buffer_size;
          send_image->Zip( img_buffer, &zip_buffer_size );
          img_buffer_size = zip_buffer_size;
          break;
#else
          Error("zlib is required for zipped images. Falling back to raw image");
          type = STREAM_RAW;
#endif // HAVE_ZLIB_H
        case STREAM_RAW :
          img_buffer = (uint8_t*)(send_image->Buffer());
          img_buffer_size = send_image->Size();
          break;
        default:
          Fatal( "Unexpected frame type %d", type );
          break;
      }
    }

    switch( type ) {
      case STREAM_JPEG :
        fprintf( stdout, "Content-Type: image/jpeg\r\n" );
        break;
      case STREAM_RAW :
        fprintf( stdout, "Content-Type: image/x-rgb\r\n" );
        break;
      case STREAM_ZIP :
        fprintf( stdout, "Content-Type: image/x-rgbz\r\n" );
        break;
      default :
        Fatal( "Unexpected frame type %d", type );
        break;
    }


    if(send_raw) {
#if HAVE_SENDFILE
      fprintf( stdout, "Content-Length: %d\r\n\r\n", (int)filestat.st_size );
      if(zm_sendfile(fileno(stdout), fileno(fdj), 0, (int)filestat.st_size) != (int)filestat.st_size) {
        /* sendfile() failed, use standard way instead */
        img_buffer_size = fread( img_buffer, 1, sizeof(temp_img_buffer), fdj );
        if ( fwrite( img_buffer, img_buffer_size, 1, stdout ) != 1 ) {
          Error("Unable to send raw frame %u: %s",curr_frame_id,strerror(errno));
          return( false );
        }
      }
#else
      fprintf( stdout, "Content-Length: %d\r\n\r\n", img_buffer_size );
      if ( fwrite( img_buffer, img_buffer_size, 1, stdout ) != 1 ) {
        Error("Unable to send raw frame %u: %s",curr_frame_id,strerror(errno));
        return( false );
      }
#endif
      fclose(fdj); /* Close the file handle */
    } else {
      fprintf( stdout, "Content-Length: %d\r\n\r\n", img_buffer_size );
      if ( fwrite( img_buffer, img_buffer_size, 1, stdout ) != 1 ) {
        Error( "Unable to send stream frame: %s", strerror(errno) );
        return( false );
      }
    }

    fprintf( stdout, "\r\n\r\n" );
    fflush( stdout );
  }
  last_frame_sent = TV_2_FLOAT( now );
  return( true );
}

void EventStream::runStream() {
  Event::Initialise();

  openComms();

  checkInitialised();

  updateFrameRate( (double)event_data->frame_count/event_data->duration );

  if ( type == STREAM_JPEG )
    fprintf( stdout, "Content-Type: multipart/x-mixed-replace;boundary=ZoneMinderFrame\r\n\r\n" );

  if ( !event_data ) {
    sendTextFrame( "No event data found" );
    exit( 0 );
  }

  unsigned int delta_us = 0;
  while( !zm_terminate ) {
    gettimeofday( &now, NULL );

    while(checkCommandQueue());

    if ( step != 0 )
      curr_frame_id += step;

    checkEventLoaded();

    // Get current frame data
    FrameData *frame_data = &event_data->frames[curr_frame_id-1];

    //Info( "cst:%.2f", curr_stream_time );
    //Info( "cfid:%d", curr_frame_id );
    //Info( "fdt:%d", frame_data->timestamp );
    if ( !paused ) {
      bool in_event = true;
      double time_to_event = 0;
      if ( replay_rate > 0 ) {
        time_to_event = event_data->frames[0].timestamp - curr_stream_time;
        if ( time_to_event > 0 )
          in_event = false;
      } else if ( replay_rate < 0 ) {
        time_to_event = curr_stream_time - event_data->frames[event_data->frame_count-1].timestamp;
        if ( time_to_event > 0 )
          in_event = false;
      }
      if ( !in_event ) {
        double actual_delta_time = TV_2_FLOAT( now ) - last_frame_sent;
        if ( actual_delta_time > 1 ) {
          static char frame_text[64];
          snprintf( frame_text, sizeof(frame_text), "Time to next event = %d seconds", (int)time_to_event );
          if ( !sendTextFrame( frame_text ) )
            zm_terminate = true;
        }
        //else
        //{
          usleep( STREAM_PAUSE_WAIT );
          //curr_stream_time += (replay_rate>0?1:-1) * ((1.0L * replay_rate * STREAM_PAUSE_WAIT)/(ZM_RATE_BASE * 1000000));
          curr_stream_time += (1.0L * replay_rate * STREAM_PAUSE_WAIT)/(ZM_RATE_BASE * 1000000);
        //}
        continue;
      }
    }

    // Figure out if we should send this frame
    bool send_frame = false;
    if ( !paused ) {
      // If we are streaming and this frame is due to be sent
      if ( ((curr_frame_id-1)%frame_mod) == 0 ) {
        delta_us = (unsigned int)(frame_data->delta * 1000000);
        // if effective > base we should speed up frame delivery
        delta_us = (unsigned int)((delta_us * base_fps)/effective_fps);
        // but must not exceed maxfps
        delta_us = max(delta_us, 1000000 / maxfps);
        send_frame = true;
      }
    } else if ( step != 0 ) {
      // We are paused and are just stepping forward or backward one frame
      step = 0;
      send_frame = true;
    } else {
      // We are paused, and doing nothing
      double actual_delta_time = TV_2_FLOAT( now ) - last_frame_sent;
      if ( actual_delta_time > MAX_STREAM_DELAY ) {
        // Send keepalive
        Debug( 2, "Sending keepalive frame" );
        send_frame = true;
      }
    }

    if ( send_frame )
      if ( !sendFrame( delta_us ) )
        zm_terminate = true;

    curr_stream_time = frame_data->timestamp;

    if ( !paused ) {
      curr_frame_id += replay_rate>0?1:-1;
      if ( send_frame && type != STREAM_MPEG ) {
        Debug( 3, "dUs: %d", delta_us );
        usleep( delta_us );
      }
    } else {
      usleep( (unsigned long)((1000000 * ZM_RATE_BASE)/((base_fps?base_fps:1)*abs(replay_rate*2))) );
    }
  } // end while ! zm_terminate
#if HAVE_LIBAVCODEC
  if ( type == STREAM_MPEG )
    delete vid_stream;
#endif // HAVE_LIBAVCODEC

  closeComms();
}