private bool InternalSeek(ref double absoluteTimestamp)
{
//0. We have to send codecs again
_audioVideoCodecsSent = false;
//1. Switch to millisecond.FrameIndex table
if (!_pSeekFile.SeekTo(_timeToIndexOffset))
{
Logger.FATAL("Failed to seek to ms.FrameIndex table");
return(false);
}
//2. Read the sampling rate
var samplingRate = _pSeekFile.Br.ReadUInt32();
//3. compute the index in the time2frameindex
var tableIndex = (uint)(absoluteTimestamp / samplingRate);
//4. Seek to that corresponding index
_pSeekFile.SeekAhead(tableIndex * 4);
//5. Read the frame index
var frameIndex = _pSeekFile.Br.ReadUInt32();
//7. Position the seek file to that particular frame
if (!_pSeekFile.SeekTo(_framesBaseOffset + frameIndex * MediaFrame.MediaFrameSize))
{
Logger.FATAL("Unablt to seek inside seek file");
return(false);
}
//8. Read the frame
if (!MediaFrame.ReadFromMediaFile(_pSeekFile, out _currentFrame))
{
Logger.FATAL("Unable to read frame from seeking file");
return(false);
}
//9. update the stream counters
_startFeedingTime = DateTime.Now;
_totalSentTime = 0;
_currentFrameIndex = frameIndex;
_totalSentTimeBase = (uint)(_currentFrame.AbsoluteTime / 1000);
absoluteTimestamp = _currentFrame.AbsoluteTime;
//10. Go back on the frame of interest
if (!_pSeekFile.SeekTo(_framesBaseOffset + frameIndex * MediaFrame.MediaFrameSize))
{
Logger.FATAL("Unablt to seek inside seek file");
return(false);
}
//11. Done
return(true);
}
protected virtual bool Feed()
{
//2. First, send audio and video codecs
if (!_audioVideoCodecsSent && !SendCodecs())
{
Logger.FATAL("Unable to send audio codec");
return(false);
}
while (!Paused && OutStreams.Count != 0)
{
//2. Determine if the client has enough data on the buffer and continue
//or stay put
var elapsedTime = (int)(DateTime.Now - _startFeedingTime).TotalSeconds;
if ((int)_totalSentTime - elapsedTime >= _clientSideBufferLength)
{
return(true);
}
//3. Test to see if we have sent the last frame
if (_currentFrameIndex >= _totalFrames || _playLimit >= 0 && _playLimit < _totalSentTime)
{
this.Log().Info("Done streaming file");
OutStreams.Last().SignalStreamCompleted();
Paused = true;
return(true);
}
//4. Read the current frame from the seeking file
if (!_pSeekFile.SeekTo(_framesBaseOffset + _currentFrameIndex * MediaFrame.MediaFrameSize))
{
Logger.FATAL("Unablt to seek inside seek file");
return(false);
}
if (!MediaFrame.ReadFromMediaFile(_pSeekFile, out _currentFrame))
{
Logger.FATAL("Unable to read frame from seeking file");
return(false);
}
Stream buffer = null;
//Debug.WriteLine("{2},{0}:{1}", _currentFrame.AbsoluteTime, _currentFrame.Type, _currentFrameIndex);
switch (_currentFrame.Type)
{
case MediaFrameType.Data:
_currentFrameIndex++;
if (!FeedMetaData(_pFile, _currentFrame))
{
Logger.FATAL("Unable to feed metadata");
return(false);
}
break;
case MediaFrameType.Audio:
buffer = _audioBuffer;
goto case MediaFrameType.Video;
case MediaFrameType.Video:
if (buffer == null)
{
buffer = _videoBuffer;
}
//7. Build the frame
if (!BuildFrame(_pFile, _currentFrame, buffer))
{
Logger.FATAL("Unable to build the frame");
return(false);
}
//8. Compute the timestamp
_totalSentTime = _currentFrame.AbsoluteTime / 1000 - _totalSentTimeBase;
//9. Do the feedeng
FeedData(buffer, (uint)buffer.Length, 0, (uint)buffer.Length, _currentFrame.AbsoluteTime, _currentFrame.Type == MediaFrameType.Audio);
//10. Discard the data
buffer.IgnoreAll();
//11. Increment the frame index
_currentFrameIndex++;
//12. Done. We either feed again if frame length was 0
//or just return true
//return _currentFrame.Length != 0 || Feed();
break;
default:
if (!FeedOtherType())
{
return(false);
}
break;
}
}
return(true);
}
private bool SendCodecs()
{
//1. Read the first frame
MediaFrame frame1;
if (!_pSeekFile.SeekTo(_framesBaseOffset + 0 * MediaFrame.MediaFrameSize))
{
Logger.FATAL("Unablt to seek inside seek file");
return(false);
}
if (!MediaFrame.ReadFromMediaFile(_pSeekFile, out frame1))
{
Logger.FATAL("Unable to read frame from seeking file");
return(false);
}
//2. Read the second frame
MediaFrame frame2;
if (!_pSeekFile.SeekTo(_framesBaseOffset + 1 * MediaFrame.MediaFrameSize))
{
Logger.FATAL("Unablt to seek inside seek file");
return(false);
}
if (!MediaFrame.ReadFromMediaFile(_pSeekFile, out frame2))
{
Logger.FATAL("Unable to read frame from seeking file");
return(false);
}
//3. Read the current frame to pickup the timestamp from it
MediaFrame currentFrame;
if (!_pSeekFile.SeekTo(_framesBaseOffset + _currentFrameIndex * MediaFrame.MediaFrameSize))
{
Logger.FATAL("Unablt to seek inside seek file");
return(false);
}
if (!MediaFrame.ReadFromMediaFile(_pSeekFile, out currentFrame))
{
Logger.FATAL("Unable to read frame from seeking file");
return(false);
}
//4. Is the first frame a codec setup?
//If not, the second is not a codec setup for sure
if (!frame1.IsBinaryHeader)
{
_audioVideoCodecsSent = true;
return(true);
}
//5. Build the buffer for the first frame
var buffer = Utils.Rms.GetStream();
if (!BuildFrame(_pFile, frame1, buffer))
{
Logger.FATAL("Unable to build the frame");
return(false);
}
//6. Do the feedeng with the first frame
FeedData(buffer, (uint)buffer.Length, 0, (uint)buffer.Length, currentFrame.AbsoluteTime,
frame1.Type == MediaFrameType.Audio);
//7. Is the second frame a codec setup?
if (!frame2.IsBinaryHeader)
{
_audioVideoCodecsSent = true;
return(true);
}
//8. Build the buffer for the second frame
buffer.IgnoreAll();
if (!BuildFrame(_pFile, frame2, buffer))
{
Logger.FATAL("Unable to build the frame");
return(false);
}
//9. Do the feedeng with the second frame
FeedData(buffer, (uint)buffer.Length, 0, (uint)buffer.Length, currentFrame.AbsoluteTime,
frame2.Type == MediaFrameType.Audio);
//10. Done
_audioVideoCodecsSent = true;
return(true);
}