private void ResponseCallback(IAsyncResult iAsynchronousResult)
{
try
{
_ahMediaSourceAttributes = null;
_aMediaStreamDescriptions = null;
_cMP3WaveFormat = null;
_cStream = new MediaStream(((HttpWebResponse)_cHttpWebRequest.EndGetResponse(iAsynchronousResult)).GetResponseStream());
_cStream.Position = 0;
// Initialize data structures to pass to the Media pipeline via the MediaStreamSource
_ahMediaSourceAttributes = new Dictionary<MediaSourceAttributesKeys, string>();
_aMediaStreamDescriptions = new List<MediaStreamDescription>();
Dictionary<MediaStreamAttributeKeys, string> ahMediaStreamAttributes = new Dictionary<MediaStreamAttributeKeys, string>();
ahMediaStreamAttributes[MediaStreamAttributeKeys.VideoFourCC] = "H264";
ahMediaStreamAttributes[MediaStreamAttributeKeys.Width] = _nVideoFrameWidth.ToString();
ahMediaStreamAttributes[MediaStreamAttributeKeys.Height] = _nVideoFrameHeight.ToString();
_nCurrentFrameVideo = 0;
_nCurrentFrameAudio = 0;
_cMediaStreamVideoDescription = new MediaStreamDescription(MediaStreamType.Video, ahMediaStreamAttributes);
_aMediaStreamDescriptions.Add(_cMediaStreamVideoDescription);
FileTypeCompatibility cFtyp = (FileTypeCompatibility)Atom.Read(_cStream);
Wide cWide = (Wide)cFtyp.cNext;
MovieData cMdat = (MovieData)cWide.cNext;
nDataStart = cMdat.DataOffsetGet();
nDataSize = cMdat.DataSizeGet();
//1. When the next four bytes in the bitstream form the four-byte sequence 0x00000001, the next byte in the byte
//stream (which is a zero_byte syntax element) is extracted and discarded and the current position in the byte
//stream is set equal to the position of the byte following this discarded byte.
while (true)
{
if (0 == _cStream.ReadByte() && 0 == _cStream.ReadByte() && 0 == _cStream.ReadByte() && 1 == _cStream.ReadByte())
{
break;
}
}
//2. The next three-byte sequence in the byte stream (which is a start_code_prefix_one_3bytes) is extracted and
//discarded and the current position in the byte stream is set equal to the position of the byte following this
//three-byte sequence.
_cMP3WaveFormat = new MpegLayer3WaveFormat();
_cMP3WaveFormat.WaveFormatEx = new WaveFormatEx();
_cMP3WaveFormat.WaveFormatEx.FormatTag = WaveFormatEx.FormatMP3;
//_cMP3WaveFormat.WaveFormatEx.Channels = (short)((mpegLayer3Frame.Channels == MediaParsers.Channel.SingleChannel) ? 1 : 2);
_cMP3WaveFormat.WaveFormatEx.Channels = (short)2;
//_cMP3WaveFormat.WaveFormatEx.SamplesPerSec = mpegLayer3Frame.SamplingRate;
_cMP3WaveFormat.WaveFormatEx.SamplesPerSec = _nAudioSampleRate;
//_cMP3WaveFormat.WaveFormatEx.AvgBytesPerSec = mpegLayer3Frame.Bitrate / 8;
_cMP3WaveFormat.WaveFormatEx.AvgBytesPerSec = _nAudioBitRate / 8;
_cMP3WaveFormat.WaveFormatEx.BlockAlign = 1;
_cMP3WaveFormat.WaveFormatEx.BitsPerSample = 0;
_cMP3WaveFormat.WaveFormatEx.Size = 12;
_cMP3WaveFormat.Id = 1;
_cMP3WaveFormat.BitratePaddingMode = 0;
_cMP3WaveFormat.FramesPerBlock = 1;
//_cMP3WaveFormat.BlockSize = (short)mpegLayer3Frame.FrameSize; //(short)(144 * nBitRate / _nAudioSampleRate + _cMP3WaveFormat.BitratePaddingMode);
_cMP3WaveFormat.BlockSize = (short)(144 * _nAudioBitRate / _nAudioSampleRate + _cMP3WaveFormat.BitratePaddingMode);
_cMP3WaveFormat.CodecDelay = 0;
ahMediaStreamAttributes = new Dictionary<MediaStreamAttributeKeys, string>();
ahMediaStreamAttributes[MediaStreamAttributeKeys.CodecPrivateData] = _cMP3WaveFormat.ToHexString();
_cMediaStreamAudioDescription = new MediaStreamDescription(MediaStreamType.Audio, ahMediaStreamAttributes);
_aMediaStreamDescriptions.Add(_cMediaStreamAudioDescription);
switch (_nAudioBitRate)
{
case 64000:
_nAudioMP3ControlByte = 0x54;
break;
case 128000:
_nAudioMP3ControlByte = 0x94;
break;
default:
throw new Exception("unsupported audio bit rate:" + _nAudioBitRate);
}
_aFramesOffsets.Add(new FrameOffset(0, 0));
_nFrameDuration = TimeSpan.FromSeconds((double)1 / 25).Ticks; //FPS
_nSampleDuration = TimeSpan.FromSeconds(((double)1 / _nAudioSampleRate) * 1152).Ticks;
try
{
long nBufferTicks = TimeSpan.FromSeconds(_nBufferSeconds).Ticks;
while ((ulong)_nBufferSeconds > _nFramesQty || nBufferTicks > (_aAudioNALs.Count * _nSampleDuration)) //если длительность меньше буфера, то крутим до исключения, по которому и выйдем из цикла
NALUnitParse();
_cThread = new System.Threading.Thread(NALUnitsReceive);
_cThread.Start();
}
catch
{
_bCached = true;
}
TimeSpan tsDuration;
if (1 > _nFramesQty)
{
lock (_cSyncRoot)
{
long nDurationAudio = (long)(_aAudioNALs.Count * _nSampleDuration);
long nDurationVideo = (long)(_aVideoNALs.Count(row => row.bFrameStart) * _nFrameDuration);
tsDuration = TimeSpan.FromTicks(nDurationAudio > nDurationVideo ? nDurationAudio : nDurationVideo);
}
}
else
tsDuration = TimeSpan.FromMilliseconds(_nFramesQty * 40); //FPS
_ahMediaSourceAttributes[MediaSourceAttributesKeys.Duration] = tsDuration.Ticks.ToString(System.Globalization.CultureInfo.InvariantCulture);
_ahMediaSourceAttributes[MediaSourceAttributesKeys.CanSeek] = true.ToString();
ReportOpenMediaCompleted(_ahMediaSourceAttributes, _aMediaStreamDescriptions);
}
catch (WebException e)
{
// Need to handle the exception
}
}
private void ResponseCallback(IAsyncResult iAsynchronousResult)
{
try
{
_ahMediaSourceAttributes = null;
_aMediaStreamDescriptions = null;
_cMP3WaveFormat = null;
_cStream = new MediaStream(((HttpWebResponse)_cHttpWebRequest.EndGetResponse(iAsynchronousResult)).GetResponseStream());
_cStream.Position = 0;
// Initialize data structures to pass to the Media pipeline via the MediaStreamSource
_ahMediaSourceAttributes = new Dictionary <MediaSourceAttributesKeys, string>();
_aMediaStreamDescriptions = new List <MediaStreamDescription>();
Dictionary <MediaStreamAttributeKeys, string> ahMediaStreamAttributes = new Dictionary <MediaStreamAttributeKeys, string>();
ahMediaStreamAttributes[MediaStreamAttributeKeys.VideoFourCC] = "H264";
ahMediaStreamAttributes[MediaStreamAttributeKeys.Width] = _nVideoFrameWidth.ToString();
ahMediaStreamAttributes[MediaStreamAttributeKeys.Height] = _nVideoFrameHeight.ToString();
_nCurrentFrameVideo = 0;
_nCurrentFrameAudio = 0;
_cMediaStreamVideoDescription = new MediaStreamDescription(MediaStreamType.Video, ahMediaStreamAttributes);
_aMediaStreamDescriptions.Add(_cMediaStreamVideoDescription);
FileTypeCompatibility cFtyp = (FileTypeCompatibility)Atom.Read(_cStream);
Wide cWide = (Wide)cFtyp.cNext;
MovieData cMdat = (MovieData)cWide.cNext;
nDataStart = cMdat.DataOffsetGet();
nDataSize = cMdat.DataSizeGet();
//1. When the next four bytes in the bitstream form the four-byte sequence 0x00000001, the next byte in the byte
//stream (which is a zero_byte syntax element) is extracted and discarded and the current position in the byte
//stream is set equal to the position of the byte following this discarded byte.
while (true)
{
if (0 == _cStream.ReadByte() && 0 == _cStream.ReadByte() && 0 == _cStream.ReadByte() && 1 == _cStream.ReadByte())
{
break;
}
}
//2. The next three-byte sequence in the byte stream (which is a start_code_prefix_one_3bytes) is extracted and
//discarded and the current position in the byte stream is set equal to the position of the byte following this
//three-byte sequence.
_cMP3WaveFormat = new MpegLayer3WaveFormat();
_cMP3WaveFormat.WaveFormatEx = new WaveFormatEx();
_cMP3WaveFormat.WaveFormatEx.FormatTag = WaveFormatEx.FormatMP3;
//_cMP3WaveFormat.WaveFormatEx.Channels = (short)((mpegLayer3Frame.Channels == MediaParsers.Channel.SingleChannel) ? 1 : 2);
_cMP3WaveFormat.WaveFormatEx.Channels = (short)2;
//_cMP3WaveFormat.WaveFormatEx.SamplesPerSec = mpegLayer3Frame.SamplingRate;
_cMP3WaveFormat.WaveFormatEx.SamplesPerSec = _nAudioSampleRate;
//_cMP3WaveFormat.WaveFormatEx.AvgBytesPerSec = mpegLayer3Frame.Bitrate / 8;
_cMP3WaveFormat.WaveFormatEx.AvgBytesPerSec = _nAudioBitRate / 8;
_cMP3WaveFormat.WaveFormatEx.BlockAlign = 1;
_cMP3WaveFormat.WaveFormatEx.BitsPerSample = 0;
_cMP3WaveFormat.WaveFormatEx.Size = 12;
_cMP3WaveFormat.Id = 1;
_cMP3WaveFormat.BitratePaddingMode = 0;
_cMP3WaveFormat.FramesPerBlock = 1;
//_cMP3WaveFormat.BlockSize = (short)mpegLayer3Frame.FrameSize; //(short)(144 * nBitRate / _nAudioSampleRate + _cMP3WaveFormat.BitratePaddingMode);
_cMP3WaveFormat.BlockSize = (short)(144 * _nAudioBitRate / _nAudioSampleRate + _cMP3WaveFormat.BitratePaddingMode);
_cMP3WaveFormat.CodecDelay = 0;
ahMediaStreamAttributes = new Dictionary <MediaStreamAttributeKeys, string>();
ahMediaStreamAttributes[MediaStreamAttributeKeys.CodecPrivateData] = _cMP3WaveFormat.ToHexString();
_cMediaStreamAudioDescription = new MediaStreamDescription(MediaStreamType.Audio, ahMediaStreamAttributes);
_aMediaStreamDescriptions.Add(_cMediaStreamAudioDescription);
switch (_nAudioBitRate)
{
case 64000:
_nAudioMP3ControlByte = 0x54;
break;
case 128000:
_nAudioMP3ControlByte = 0x94;
break;
default:
throw new Exception("unsupported audio bit rate:" + _nAudioBitRate);
}
_aFramesOffsets.Add(new FrameOffset(0, 0));
_nFrameDuration = TimeSpan.FromSeconds((double)1 / 25).Ticks; //FPS
_nSampleDuration = TimeSpan.FromSeconds(((double)1 / _nAudioSampleRate) * 1152).Ticks;
try
{
long nBufferTicks = TimeSpan.FromSeconds(_nBufferSeconds).Ticks;
while ((ulong)_nBufferSeconds > _nFramesQty || nBufferTicks > (_aAudioNALs.Count * _nSampleDuration)) //если длительность меньше буфера, то крутим до исключения, по которому и выйдем из цикла
{
NALUnitParse();
}
_cThread = new System.Threading.Thread(NALUnitsReceive);
_cThread.Start();
}
catch
{
_bCached = true;
}
TimeSpan tsDuration;
if (1 > _nFramesQty)
{
lock (_cSyncRoot)
{
long nDurationAudio = (long)(_aAudioNALs.Count * _nSampleDuration);
long nDurationVideo = (long)(_aVideoNALs.Count(row => row.bFrameStart) * _nFrameDuration);
tsDuration = TimeSpan.FromTicks(nDurationAudio > nDurationVideo ? nDurationAudio : nDurationVideo);
}
}
else
{
tsDuration = TimeSpan.FromMilliseconds(_nFramesQty * 40); //FPS
}
_ahMediaSourceAttributes[MediaSourceAttributesKeys.Duration] = tsDuration.Ticks.ToString(System.Globalization.CultureInfo.InvariantCulture);
_ahMediaSourceAttributes[MediaSourceAttributesKeys.CanSeek] = true.ToString();
ReportOpenMediaCompleted(_ahMediaSourceAttributes, _aMediaStreamDescriptions);
}
catch (WebException e)
{
// Need to handle the exception
}
}
