public override PlaybackReadResponse ReadData(Guid playbackId)
{
DateTime cur;
lock (_playbackLockObj)
{
if (!_playbackCursors.TryGetValue(playbackId, out cur))
{
throw new KeyNotFoundException(nameof(playbackId));
}
}
try
{
// TODO: request real data
byte[] data = new byte[] { };
if (data == null)
{
Toolbox.Log.Trace("--- No data returned ");
return(null);
}
// TODO: Change to correct values - potentially different codec.
VideoHeader jpegHeader = new VideoHeader();
jpegHeader.CodecType = VideoCodecType.JPEG;
jpegHeader.SyncFrame = true;
PlaybackFrame frame = new PlaybackFrame()
{
Data = data, Header = jpegHeader, AnyMotion = true
};
jpegHeader.SequenceNumber = 0;
jpegHeader.Length = (ulong)data.Length;
jpegHeader.TimestampFrame = cur;
jpegHeader.TimestampSync = cur;
DateTime prev = cur - TimeSpan.FromSeconds(1);
DateTime next = cur + TimeSpan.FromSeconds(1);
return(new PlaybackReadResponse()
{
SequenceNumber = _sequenceNumbers[playbackId],
Next = next,
Previous = prev,
Frames = new[] { frame },
});
}
catch (Exception e)
{
Toolbox.Log.Trace("{0}: Exception={1}", nameof(ReadData), e.Message + e.StackTrace);
return(null);
}
}
public override PlaybackReadResponse ReadData(Guid playbackId)
{
PlaybackSession session;
DateTime cur;
lock (_playbackLockObj)
{
if (!_playbackSessions.TryGetValue(playbackId, out session))
{
throw new KeyNotFoundException(nameof(playbackId));
}
}
cur = session.Cursor;
bool atVideo = IsAtVideo(cur);
Toolbox.Log.Trace("{0} at {1}, AtVideo: {2}", nameof(ReadData), cur.ToString("o"), atVideo);
int channel = 0;
try
{
if (!atVideo)
{
return(null);
}
byte[] data = Container.ConnectionManager.GetPlaybackFrame(channel, cur);
if (data == null)
{
Toolbox.Log.Trace("--- No data returned ");
return(null);
}
// Just as is the case for the live stream, information in a remote playback or remote retrieval scenario
// is transferred to the recorder frame by frame (whether that be a video frame or an audio frame, and in the case of e.g.
// H.264 or H.265 video, whether it be a P-frame, I-frame, etc.)
VideoHeader jpegHeader = new VideoHeader();
jpegHeader.CodecType = VideoCodecType.JPEG;
jpegHeader.SyncFrame = true; // Only set this to true for key frames.
PlaybackFrame frame = new PlaybackFrame()
{
Data = data, Header = jpegHeader, AnyMotion = true
};
jpegHeader.SequenceNumber = 0;
jpegHeader.Length = (ulong)data.Length;
jpegHeader.TimestampFrame = cur; // The time stamp of the current frame.
jpegHeader.TimestampSync = cur; // The time stamp of the most recent keyframe. If the codec does not differentiate between frame types, or if this is a keyframe, set it to the same as TimestampFrame.
DateTime prev = cur - _frameDistance; // The time stamp of the previous frame.
DateTime next = cur + _frameDistance; // The time stamp of the next frame.
if (!IsAtVideo(next))
{
next = NextSequence(next);
}
return(new PlaybackReadResponse()
{
SequenceNumber = session.SequenceNumber,
Next = next,
Previous = prev,
Frames = new[] { frame },
});
}
catch (Exception e)
{
Toolbox.Log.Trace("{0}: Exception={1}", nameof(ReadData), e.Message + e.StackTrace);
throw;
}
}