//
// ZoneMinder Remote Camera 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.h"

#if HAVE_LIBAVFORMAT

#include "zm_remote_camera_rtsp.h"
#include "zm_ffmpeg.h"
#include "zm_mem_utils.h"

#include <sys/types.h>
#include <sys/socket.h>

RemoteCameraRtsp::RemoteCameraRtsp( unsigned int p_monitor_id, const std::string &p_method, const std::string &p_host, const std::string &p_port, const std::string &p_path, int p_width, int p_height, bool p_rtsp_describe, int p_colours, int p_brightness, int p_contrast, int p_hue, int p_colour, bool p_capture, bool p_record_audio ) :
  RemoteCamera( p_monitor_id, "rtsp", p_host, p_port, p_path, p_width, p_height, p_colours, p_brightness, p_contrast, p_hue, p_colour, p_capture, p_record_audio ),
  rtsp_describe( p_rtsp_describe ),
  rtspThread( 0 )

{
  if ( p_method == "rtpUni" )
    method = RtspThread::RTP_UNICAST;
  else if ( p_method == "rtpMulti" )
    method = RtspThread::RTP_MULTICAST;
  else if ( p_method == "rtpRtsp" )
    method = RtspThread::RTP_RTSP;
  else if ( p_method == "rtpRtspHttp" )
    method = RtspThread::RTP_RTSP_HTTP;
  else
    Fatal( "Unrecognised method '%s' when creating RTSP camera %d", p_method.c_str(), monitor_id );

  if ( capture ) {
    Initialise();
  }
  
  mFormatContext = NULL;
  mVideoStreamId = -1;
  mAudioStreamId = -1;
  mCodecContext = NULL;
  mCodec = NULL;
  mRawFrame = NULL;
  mFrame = NULL;
  frameCount = 0;
  startTime=0;
  
#if HAVE_LIBSWSCALE
  mConvertContext = NULL;
#endif
  /* Has to be located inside the constructor so other components such as zma will receive correct colours and subpixel order */
  if(colours == ZM_COLOUR_RGB32) {
    subpixelorder = ZM_SUBPIX_ORDER_RGBA;
    imagePixFormat = AV_PIX_FMT_RGBA;
  } else if(colours == ZM_COLOUR_RGB24) {
    subpixelorder = ZM_SUBPIX_ORDER_RGB;
    imagePixFormat = AV_PIX_FMT_RGB24;
  } else if(colours == ZM_COLOUR_GRAY8) {
    subpixelorder = ZM_SUBPIX_ORDER_NONE;
    imagePixFormat = AV_PIX_FMT_GRAY8;
  } else {
    Panic("Unexpected colours: %d",colours);
  }
} // end RemoteCameraRtsp::RemoteCameraRtsp(...)

RemoteCameraRtsp::~RemoteCameraRtsp() {
  av_frame_free( &mFrame );
  av_frame_free( &mRawFrame );
  
#if HAVE_LIBSWSCALE
  if ( mConvertContext ) {
    sws_freeContext( mConvertContext );
    mConvertContext = NULL;
  }
#endif

  if ( mCodecContext ) {
     avcodec_close( mCodecContext );
     mCodecContext = NULL; // Freed by avformat_free_context in the destructor of RtspThread class
  }

  if ( capture ) {
    Terminate();
  }
}

void RemoteCameraRtsp::Initialise() {
  RemoteCamera::Initialise();

  int max_size = width*height*colours;

  // This allocates a buffer able to hold a raw fframe, which is a little artbitrary.  Might be nice to get some
  // decent data on how large a buffer is really needed.  I think in ffmpeg there are now some functions to do that.
  buffer.size( max_size );

  if ( logDebugging() )
    av_log_set_level( AV_LOG_DEBUG ); 
  else
    av_log_set_level( AV_LOG_QUIET ); 

  av_register_all();

  Connect();
}

void RemoteCameraRtsp::Terminate() {
  Disconnect();
}

int RemoteCameraRtsp::Connect() {
  rtspThread = new RtspThread( monitor_id, method, protocol, host, port, path, auth, rtsp_describe );

  rtspThread->start();

  return( 0 );
}

int RemoteCameraRtsp::Disconnect() {
  if ( rtspThread ) {
    rtspThread->stop();
    rtspThread->join();
    delete rtspThread;
    rtspThread = 0;
  }
  return( 0 );
}

int RemoteCameraRtsp::PrimeCapture() {
  Debug( 2, "Waiting for sources" );
  for ( int i = 0; i < 100 && !rtspThread->hasSources(); i++ ) {
    usleep( 100000 );
  }
  if ( !rtspThread->hasSources() )
    Fatal( "No RTSP sources" );

  Debug( 2, "Got sources" );

  mFormatContext = rtspThread->getFormatContext();

  // Find first video stream present
  mVideoStreamId = -1;
  mAudioStreamId = -1;
  
  // Find the first video stream. 
  for ( unsigned int i = 0; i < mFormatContext->nb_streams; i++ ) {
#if (LIBAVCODEC_VERSION_CHECK(52, 64, 0, 64, 0) || LIBAVUTIL_VERSION_CHECK(50, 14, 0, 14, 0))
    if ( mFormatContext->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO )
#else
    if ( mFormatContext->streams[i]->codec->codec_type == CODEC_TYPE_VIDEO )
#endif
    {
      if ( mVideoStreamId == -1 ) {
        mVideoStreamId = i;
        continue;
      } else {
        Debug(2, "Have another video stream." );
      }
    }
#if (LIBAVCODEC_VERSION_CHECK(52, 64, 0, 64, 0) || LIBAVUTIL_VERSION_CHECK(50, 14, 0, 14, 0))
    if ( mFormatContext->streams[i]->codec->codec_type == AVMEDIA_TYPE_AUDIO )
#else
    if ( mFormatContext->streams[i]->codec->codec_type == CODEC_TYPE_AUDIO )
#endif
    {
      if ( mAudioStreamId == -1 ) {
        mAudioStreamId = i;
      } else {
        Debug(2, "Have another audio stream." );
      }
    }
  } // end foreach stream

  if ( mVideoStreamId == -1 )
    Fatal( "Unable to locate video stream" );
  if ( mAudioStreamId == -1 )
    Debug( 3, "Unable to locate audio stream" );

  // Get a pointer to the codec context for the video stream
  mCodecContext = mFormatContext->streams[mVideoStreamId]->codec;

  // Find the decoder for the video stream
  mCodec = avcodec_find_decoder( mCodecContext->codec_id );
  if ( mCodec == NULL )
    Panic( "Unable to locate codec %d decoder", mCodecContext->codec_id );

  // Open codec
#if !LIBAVFORMAT_VERSION_CHECK(53, 8, 0, 8, 0)
  if ( avcodec_open( mCodecContext, mCodec ) < 0 )
#else
  if ( avcodec_open2( mCodecContext, mCodec, 0 ) < 0 )
#endif
    Panic( "Can't open codec" );

  // Allocate space for the native video frame
#if LIBAVCODEC_VERSION_CHECK(55, 28, 1, 45, 101)
  mRawFrame = av_frame_alloc();
#else
  mRawFrame = avcodec_alloc_frame();
#endif

  // Allocate space for the converted video frame
#if LIBAVCODEC_VERSION_CHECK(55, 28, 1, 45, 101)
  mFrame = av_frame_alloc();
#else
  mFrame = avcodec_alloc_frame();
#endif

  if(mRawFrame == NULL || mFrame == NULL)
    Fatal( "Unable to allocate frame(s)");

#if LIBAVUTIL_VERSION_CHECK(54, 6, 0, 6, 0)
  int pSize = av_image_get_buffer_size( imagePixFormat, width, height, 1 );
#else
  int pSize = avpicture_get_size( imagePixFormat, width, height );
#endif

  if ( (unsigned int)pSize != imagesize ) {
    Fatal("Image size mismatch. Required: %d Available: %d",pSize,imagesize);
  }
/*  
#if HAVE_LIBSWSCALE
  if(!sws_isSupportedInput(mCodecContext->pix_fmt)) {
    Fatal("swscale does not support the codec format: %c%c%c%c",(mCodecContext->pix_fmt)&0xff,((mCodecContext->pix_fmt>>8)&0xff),((mCodecContext->pix_fmt>>16)&0xff),((mCodecContext->pix_fmt>>24)&0xff));
  }

  if(!sws_isSupportedOutput(imagePixFormat)) {
    Fatal("swscale does not support the target format: %c%c%c%c",(imagePixFormat)&0xff,((imagePixFormat>>8)&0xff),((imagePixFormat>>16)&0xff),((imagePixFormat>>24)&0xff));
  }
  
#else // HAVE_LIBSWSCALE
  Fatal( "You must compile ffmpeg with the --enable-swscale option to use RTSP cameras" );
#endif // HAVE_LIBSWSCALE
*/

  return( 0 );
}

int RemoteCameraRtsp::PreCapture() {
  if ( !rtspThread->isRunning() )
    return( -1 );
  if ( !rtspThread->hasSources() ) {
    Error( "Cannot precapture, no RTP sources" );
    return( -1 );
  }
  return( 0 );
}

int RemoteCameraRtsp::Capture( Image &image ) {
  AVPacket packet;
  uint8_t* directbuffer;
  int frameComplete = false;
  
  /* Request a writeable buffer of the target image */
  directbuffer = image.WriteBuffer(width, height, colours, subpixelorder);
  if ( directbuffer == NULL ) {
    Error("Failed requesting writeable buffer for the captured image.");
    return -1;
  }
  
  while ( true ) {
    buffer.clear();
    if ( !rtspThread->isRunning() )
      return -1;

    if ( rtspThread->getFrame( buffer ) ) {
      Debug( 3, "Read frame %d bytes", buffer.size() );
      Debug( 4, "Address %p", buffer.head() );
      Hexdump( 4, buffer.head(), 16 );

      if ( !buffer.size() )
        return -1;

      if ( mCodecContext->codec_id == AV_CODEC_ID_H264 ) {
        // SPS and PPS frames should be saved and appended to IDR frames
        int nalType = (buffer.head()[3] & 0x1f);
        
        // SPS The SPS NAL unit contains parameters that apply to a series of consecutive coded video pictures
        if ( nalType == 7 ) {
          lastSps = buffer;
          continue;
        } else if ( nalType == 8 ) {
        // PPS The PPS NAL unit contains parameters that apply to the decoding of one or more individual pictures inside a coded video sequence
          lastPps = buffer;
          continue;
        } else if ( nalType == 5 ) {
        // IDR
          buffer += lastSps;
          buffer += lastPps;
        }
      } else {
        Debug(3, "Not an h264 packet");
      }

      av_init_packet( &packet );

      while ( !frameComplete && buffer.size() > 0 ) {
        packet.data = buffer.head();
        packet.size = buffer.size();

        // So I think this is the magic decode step. Result is a raw image?
#if LIBAVCODEC_VERSION_CHECK(52, 23, 0, 23, 0)
        int len = avcodec_decode_video2( mCodecContext, mRawFrame, &frameComplete, &packet );
#else
        int len = avcodec_decode_video( mCodecContext, mRawFrame, &frameComplete, packet.data, packet.size );
#endif
        if ( len < 0 ) {
          Error( "Error while decoding frame %d", frameCount );
          Hexdump( Logger::ERROR, buffer.head(), buffer.size()>256?256:buffer.size() );
          buffer.clear();
          continue;
        }
        Debug( 2, "Frame: %d - %d/%d", frameCount, len, buffer.size() );
        //if ( buffer.size() < 400 )
        //Hexdump( 0, buffer.head(), buffer.size() );
        
        buffer -= len;
      }
      // At this point, we either have a frame or ran out of buffer. What happens if we run out of buffer?
      if ( frameComplete ) {
         
        Debug( 3, "Got frame %d", frameCount );
            
        avpicture_fill( (AVPicture *)mFrame, directbuffer, imagePixFormat, width, height );
          
    #if HAVE_LIBSWSCALE
        if(mConvertContext == NULL) {
          mConvertContext = sws_getContext( mCodecContext->width, mCodecContext->height, mCodecContext->pix_fmt, width, height, imagePixFormat, SWS_BICUBIC, NULL, NULL, NULL );

          if(mConvertContext == NULL)
            Fatal( "Unable to create conversion context");
        }
      
        if ( sws_scale( mConvertContext, mRawFrame->data, mRawFrame->linesize, 0, mCodecContext->height, mFrame->data, mFrame->linesize ) < 0 )
          Fatal( "Unable to convert raw format %u to target format %u at frame %d", mCodecContext->pix_fmt, imagePixFormat, frameCount );
    #else // HAVE_LIBSWSCALE
        Fatal( "You must compile ffmpeg with the --enable-swscale option to use RTSP cameras" );
    #endif // HAVE_LIBSWSCALE
      
        frameCount++;

      } /* frame complete */
       
      zm_av_packet_unref( &packet );
    } /* getFrame() */
   
    if ( frameComplete )
      return 1;
  
  } // end while true

  // can never get here.
  return 0;
}

//Function to handle capture and store

int RemoteCameraRtsp::CaptureAndRecord(Image &image, timeval recording, char* event_file ) {
  AVPacket packet;
  uint8_t* directbuffer;
  int frameComplete = false;
  
  while ( true ) {

// WHY Are we clearing it? Might be something good in it.
    buffer.clear();

    if ( !rtspThread->isRunning() )
      return (-1);

    //Video recording
    if ( recording.tv_sec ) {
      // The directory we are recording to is no longer tied to the current event. 
      // Need to re-init the videostore with the correct directory and start recording again
      // Not sure why we are only doing this on keyframe, al
      if ( videoStore && (strcmp(oldDirectory, event_file)!=0) ) {
        //don't open new videostore until we're on a key frame..would this require an offset adjustment for the event as a result?...if we store our key frame location with the event will that be enough?
        Info("Re-starting video storage module");
        if ( videoStore ) {
          delete videoStore;
          videoStore = NULL;
        }
      } // end if changed to new event

      if ( ! videoStore ) {
        //Instantiate the video storage module

        videoStore = new VideoStore((const char *)event_file, "mp4",
            mFormatContext->streams[mVideoStreamId],
            mAudioStreamId==-1?NULL:mFormatContext->streams[mAudioStreamId],
            startTime,
            this->getMonitor() );
        strcpy(oldDirectory, event_file);
      } // end if ! videoStore

    } else {
      if ( videoStore ) {
        Info("Deleting videoStore instance");
        delete videoStore;
        videoStore = NULL;
      }
    } // end if recording or not

    if ( rtspThread->getFrame( buffer ) ) {
      Debug( 3, "Read frame %d bytes", buffer.size() );
      Debug( 4, "Address %p", buffer.head() );
      Hexdump( 4, buffer.head(), 16 );

      if ( !buffer.size() )
        return( -1 );

      if ( mCodecContext->codec_id == AV_CODEC_ID_H264 ) {
        // SPS and PPS frames should be saved and appended to IDR frames
        int nalType = (buffer.head()[3] & 0x1f);
        
        // SPS
        if(nalType == 7) {
          lastSps = buffer;
          continue;
        } else if(nalType == 8) {
        // PPS
          lastPps = buffer;
          continue;
        } else if(nalType == 5) {
        // IDR
          buffer += lastSps;
          buffer += lastPps;
        }
      } // end if H264, what about other codecs?

      av_init_packet( &packet );
      
      // Keep decoding until a complete frame is had.
      while ( !frameComplete && buffer.size() > 0 ) {
        packet.data = buffer.head();
        packet.size = buffer.size();

        // Why are we checking for it being the video stream? Because it might be audio or something else.
        // Um... we just initialized packet... we can't be testing for what it is yet....
        if ( packet.stream_index == mVideoStreamId ) {
          // So this does the decode
#if LIBAVCODEC_VERSION_CHECK(52, 23, 0, 23, 0)
          int len = avcodec_decode_video2( mCodecContext, mRawFrame, &frameComplete, &packet );
#else
          int len = avcodec_decode_video( mCodecContext, mRawFrame, &frameComplete, packet.data, packet.size );
#endif
          if ( len < 0 ) {
            Error( "Error while decoding frame %d", frameCount );
            Hexdump( Logger::ERROR, buffer.head(), buffer.size()>256?256:buffer.size() );
            buffer.clear();
            continue;
          }
          Debug( 2, "Frame: %d - %d/%d", frameCount, len, buffer.size() );
          //if ( buffer.size() < 400 )
          //Hexdump( 0, buffer.head(), buffer.size() );

          buffer -= len;

          if ( frameComplete ) {

            Debug( 3, "Got frame %d", frameCount );

            /* Request a writeable buffer of the target image */
            directbuffer = image.WriteBuffer(width, height, colours, subpixelorder);
            if(directbuffer == NULL) {
              Error("Failed requesting writeable buffer for the captured image.");
              return (-1);
            }

#if LIBAVUTIL_VERSION_CHECK(54, 6, 0, 6, 0)
            av_image_fill_arrays(mFrame->data, mFrame->linesize,
                directbuffer, imagePixFormat, width, height, 1);
#else
            avpicture_fill( (AVPicture *)mFrame, directbuffer,
                imagePixFormat, width, height);
#endif

          } // endif frameComplete

          if ( videoStore ) {
            //Write the packet to our video store
            int ret = videoStore->writeVideoFramePacket(&packet);//, &lastKeyframePkt);
            if ( ret < 0 ) {//Less than zero and we skipped a frame
// Should not 
              zm_av_packet_unref( &packet );
              return 0;
            }
          } // end if videoStore, so we are recording

#if HAVE_LIBSWSCALE
          // Why are we re-scaling after writing out the packet?
          if ( mConvertContext == NULL ) {
            mConvertContext = sws_getContext( mCodecContext->width, mCodecContext->height, mCodecContext->pix_fmt, width, height, imagePixFormat, SWS_BICUBIC, NULL, NULL, NULL );

            if ( mConvertContext == NULL )
              Fatal( "Unable to create conversion context");
          }

          if ( sws_scale( mConvertContext, mRawFrame->data, mRawFrame->linesize, 0, mCodecContext->height, mFrame->data, mFrame->linesize ) < 0 )
            Fatal( "Unable to convert raw format %u to target format %u at frame %d", mCodecContext->pix_fmt, imagePixFormat, frameCount );
#else // HAVE_LIBSWSCALE
          Fatal( "You must compile ffmpeg with the --enable-swscale option to use RTSP cameras" );
#endif // HAVE_LIBSWSCALE

          frameCount++;

      } else if ( packet.stream_index == mAudioStreamId ) {
        Debug( 4, "Got audio packet" );
        if ( videoStore && record_audio ) {
          Debug( 4, "Storing Audio packet" );
          //Write the packet to our video store
          int ret = videoStore->writeAudioFramePacket( &packet ); //FIXME no relevance of last key frame
          if ( ret < 0 ) { //Less than zero and we skipped a frame
            zm_av_packet_unref( &packet );
            return 0;
          }
        }
      } // end if video or audio packet
     
      zm_av_packet_unref( &packet );
    } // end while ! framecomplete and buffer.size()
  if(frameComplete)
    return (0);
  } /* getFrame() */

} // end while true

// can never get here.
  return (0) ;
} // int RemoteCameraRtsp::CaptureAndRecord( Image &image, bool recording, char* event_file ) 

int RemoteCameraRtsp::PostCapture() {
  return( 0 );
}
#endif // HAVE_LIBAVFORMAT