public void PlayBytes(StreamProviderDelegate currentAudioStreamProvider,
long dataLength, AudioLibPCMFormat pcmInfo,
long bytesFrom, long bytesTo)
{
if (pcmInfo == null)
{
throw new ArgumentNullException("PCM format cannot be null !");
}
if (currentAudioStreamProvider == null)
{
throw new ArgumentNullException("Stream cannot be null !");
}
if (dataLength <= 0)
{
throw new ArgumentOutOfRangeException("Duration cannot be <= 0 !");
}
if (CurrentState == State.NotReady)
{
return;
}
if (CurrentState != State.Stopped)
{
Debug.Fail("Attempting to play when not stopped ? " + CurrentState);
return;
}
#if USE_SOUNDTOUCH
if (false && pcmInfo.NumberOfChannels > 1)
{
m_UseSoundTouch = false; //TODO: stereo all scrambled with SoundTouch !!
}
else
{
m_UseSoundTouch = m_UseSoundTouchBackup;
}
#endif // USE_SOUNDTOUCH
m_CurrentAudioStreamProvider = currentAudioStreamProvider;
m_CurrentAudioStream = m_CurrentAudioStreamProvider();
m_CurrentAudioPCMFormat = pcmInfo;
m_CurrentAudioDataLength = dataLength;
long startPosition = 0;
if (bytesFrom > 0)
{
startPosition = m_CurrentAudioPCMFormat.AdjustByteToBlockAlignFrameSize(bytesFrom);
}
long endPosition = 0;
if (bytesTo > 0)
{
endPosition = m_CurrentAudioPCMFormat.AdjustByteToBlockAlignFrameSize(bytesTo);
}
if (m_CurrentAudioPCMFormat.BytesAreEqualWithMillisecondsTolerance(startPosition, 0))
{
startPosition = 0;
}
if (m_CurrentAudioPCMFormat.BytesAreEqualWithMillisecondsTolerance(endPosition, dataLength))
{
endPosition = dataLength;
}
if (m_CurrentAudioPCMFormat.BytesAreEqualWithMillisecondsTolerance(endPosition, 0))
{
endPosition = 0;
}
if (endPosition != 0 &&
m_CurrentAudioPCMFormat.BytesAreEqualWithMillisecondsTolerance(endPosition, startPosition))
{
return;
}
if (startPosition >= 0 &&
(endPosition == 0 || startPosition < endPosition) &&
endPosition <= dataLength)
{
if (m_FwdRwdRate == 0)
{
startPlayback(startPosition, endPosition);
Console.WriteLine("starting playback ");
}
else if (m_FwdRwdRate > 0)
{
FastForward(startPosition);
Console.WriteLine("fast forward ");
}
else if (m_FwdRwdRate < 0)
{
if (startPosition == 0)
{
startPosition = m_CurrentAudioStream.Length;
}
Rewind(startPosition);
Console.WriteLine("Rewind ");
}
}
else
{
//throw new Exception("Start/end positions out of bounds of audio asset.");
DebugFix.Assert(false);
}
}
private void startPlayback(long startPosition, long endPosition)
{
initializeBuffers();
m_PlaybackStartPositionInCurrentAudioStream = startPosition;
m_PlaybackEndPositionInCurrentAudioStream = endPosition == 0
? m_CurrentAudioDataLength
: endPosition;
m_CircularBufferWritePosition = 0;
//m_CircularBufferFlushTolerance = -1;
//m_PredictedByteIncrement = -1;
//m_PreviousCircularBufferPlayPosition = -1;
//m_CircularBufferTotalBytesPlayed = -1;
m_CurrentAudioStream = m_CurrentAudioStreamProvider();
m_CurrentAudioStream.Position = m_PlaybackStartPositionInCurrentAudioStream;
int circularBufferLength = m_CircularBuffer.
#if USE_SHARPDX
Capabilities
#else
Caps
#endif
.BufferBytes
;
int bytesWrittenToCirularBuffer =
transferBytesFromWavStreamToCircularBuffer(circularBufferLength);
m_CurrentBytePosition = m_PlaybackStartPositionInCurrentAudioStream;
CurrentState = State.Playing;
//if (AllowBackToBackPlayback && m_MonitoringTimer != null) m_MonitoringTimer.Start();
try
{
m_CircularBuffer.Play(0,
#if USE_SHARPDX
PlayFlags.Looping
#else
BufferPlayFlags.Looping // this makes it a circular buffer (which we manage manually, by tracking playback versus writing positions)
#endif
);
if (m_PlaybackStopWatch == null)
{
m_PlaybackStopWatch = new Stopwatch();
}
#if NET4
m_PlaybackStopWatch.Restart();
#else
m_PlaybackStopWatch.Stop();
m_PlaybackStopWatch.Reset();
m_PlaybackStopWatch.Start();
#endif //NET4
}
catch (Exception)
{
Debug.Fail("EmergencyStopForSoundBufferProblem !");
CurrentState = State.Stopped;
StopForwardRewind();
stopPlayback();
return;
}
ThreadStart threadDelegate = delegate()
{
bool endOfAudioStream = false;
try
{
endOfAudioStream = circularBufferRefreshThreadMethod();
}
catch (ThreadAbortException ex)
{
//
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
Console.WriteLine(ex.StackTrace);
}
finally
{
if (m_PlaybackStopWatch != null)
{
m_PlaybackStopWatch.Stop();
}
if (mPreviewTimer.Enabled)
{
if (endOfAudioStream || CurrentState == State.Playing)
{
m_ResumeStartPosition = CurrentBytePosition;
CurrentState = State.Paused; // before stopPlayback(), doesn't kill the stream provider
}
lock (LOCK)
{
m_CircularBufferRefreshThread = null;
}
stopPlayback();
}
else
{
if (endOfAudioStream || CurrentState == State.Playing)
{
CurrentState = State.Stopped;
}
//if (CurrentState != State.Paused) CurrentState = State.Stopped;
lock (LOCK)
{
m_CircularBufferRefreshThread = null;
}
StopForwardRewind();
stopPlayback();
if (endOfAudioStream)
{
AudioPlaybackFinishHandler delFinished = AudioPlaybackFinished;
if (delFinished != null && !mPreviewTimer.Enabled)
{
delFinished(this, new AudioPlaybackFinishEventArgs());
}
}
}
}
//Console.WriteLine("Player refresh thread exiting....");
//CurrentState = State.Stopped;
//lock (LOCK)
//{
// //m_CircularBufferRefreshThreadIsAlive = false;
// m_CircularBufferRefreshThread = null;
//}
//Console.WriteLine("Player refresh thread exit.");
};
int count = 0;
while (m_CircularBufferRefreshThread != null)
{
Console.WriteLine(@"------------ m_CircularBufferRefreshThread NOT null!!: " + count++);
Thread.Sleep(20);
if (count > 10)
{
Console.WriteLine(@"------------ m_CircularBufferRefreshThread NOT null!! ()BREAK(): " + count++);
break;
}
}
if (m_CircularBufferRefreshThread != null)
{
stopPlayback();
}
DebugFix.Assert(m_CircularBufferRefreshThread == null);
lock (LOCK)
{
m_CircularBufferRefreshThread = new Thread(threadDelegate);
m_CircularBufferRefreshThread.Name = "Player Refresh Thread";
m_CircularBufferRefreshThread.Priority = ThreadPriority.Normal;
m_CircularBufferRefreshThread.IsBackground = true;
m_CircularBufferRefreshThread.Start();
}
//Console.WriteLine("Player refresh thread start.");
}
/// <summary>
/// Parses a RIFF WAVE PCM header of a given input <see cref="Stream"/>
/// </summary>
/// <remarks>
/// Upon succesful parsing the <paramref name="input"/> <see cref="Stream"/> is positioned at the beginning of the actual PCM data,
/// that is at the beginning of the data field of the data sub-chunk
/// </remarks>
/// <param name="input">The input <see cref="Stream"/> - must be positioned at the start of the RIFF chunk</param>
/// <returns>A <see cref="AudioLibPCMFormat"/> containing the parsed data</returns>
/// <exception cref="ArgumentOutOfRangeException">
/// Thrown when RIFF WAVE header is invalid or is not PCM data
/// </exception>
public static AudioLibPCMFormat RiffHeaderParse(Stream input, out uint dataLength)
{
DebugFix.Assert(input.Position == 0);
dataLength = 0;
BinaryReader rd = new BinaryReader(input);
//http://www.sonicspot.com/guide/wavefiles.html
// Ensures 3x4=12 bytes available to read (RIFF Type Chunk)
{
long availableBytes = input.Length - input.Position;
if (availableBytes < 12)
{
throw new ArgumentOutOfRangeException(
"The RIFF chunk descriptor does not fit in the input stream");
}
}
//Chunk ID (4 bytes)
{
string chunkId = Encoding.ASCII.GetString(rd.ReadBytes(4));
if (chunkId != "RIFF")
{
throw new ArgumentOutOfRangeException("ChunkId is not RIFF: " + chunkId);
}
}
//Chunk Data Size (the wavEndPos variable is used further below as the upper limit position in the stream)
long wavEndPos = 0;
{
// 4 bytes
uint chunkSize = rd.ReadUInt32();
// Ensures the given size fits within the actual stream
wavEndPos = input.Position + chunkSize;
DebugFix.Assert(!(wavEndPos > input.Length));
//if (wavEndPos > input.Length)
//{
// throw new ArgumentOutOfRangeException(String.Format(
// "The WAVE PCM chunk does not fit in the input Stream (expected chunk end position is {0:0}, Stream count is {1:0})",
// wavEndPos, input.Length));
//}
}
//RIFF Type (4 bytes)
{
string format = Encoding.ASCII.GetString(rd.ReadBytes(4));
if (format != "WAVE")
{
throw new ArgumentOutOfRangeException(String.Format(
"RIFF format {0} is not supported. The only supported RIFF format is WAVE",
format));
}
}
// We need at least the 'data' and the 'fmt ' chunks
bool foundWavDataChunk = false;
bool foundWavFormatChunk = false;
// We memorize the position of the actual PCM data in the stream,
// so we can seek back, if needed (normally, this never happens as the 'data' chunk
// is always the last one. However the WAV format does not mandate the order of chunks so...)
long wavDataChunkPosition = -1;
AudioLibPCMFormat pcmInfo = new AudioLibPCMFormat();
//loop when there's at least 2x4=8 bytes to read (Chunk ID & Chunk Data Size)
while (input.Position + 8 <= wavEndPos)
{
// 4 bytes
string chunkId = Encoding.ASCII.GetString(rd.ReadBytes(4));
// 4 bytes
uint chunkSize = rd.ReadUInt32();
// Ensures the given size fits within the actual stream
if (input.Position + chunkSize > wavEndPos)
{
throw new ArgumentOutOfRangeException(String.Format(
"ChunkId {0} does not fit in RIFF chunk",
chunkId));
}
switch (chunkId)
{
case "fmt ":
{
// The default information fields fit within 16 bytes
int extraFormatBytes = (int)chunkSize - 16;
// Compression code (2 bytes)
ushort compressionCode = rd.ReadUInt16();
// Number of channels (2 bytes)
ushort numChannels = rd.ReadUInt16();
if (numChannels == 0)
{
throw new ArgumentOutOfRangeException("0 channels of audio is not supported");
}
// Sample rate (4 bytes)
uint sampleRate = rd.ReadUInt32();
// Average bytes per second, aka byte-rate (4 bytes)
uint byteRate = rd.ReadUInt32();
// Block align (2 bytes)
ushort blockAlign = rd.ReadUInt16();
// Significant bits per sample, aka bit-depth (2 bytes)
ushort bitDepth = rd.ReadUInt16();
if (compressionCode != 0 && extraFormatBytes > 0)
{
// Extra format bytes (2 bytes)
uint extraBytes = rd.ReadUInt16();
if (extraBytes > 0)
{
DebugFix.Assert(extraBytes <= (extraFormatBytes - 2));
}
if (extraFormatBytes > 2)
{
extraBytes = (uint)(extraFormatBytes - 2);
// Skip (we ignore the extra information in this chunk field)
rd.ReadBytes((int)extraBytes);
// check word-alignment
if ((extraBytes % 2) != 0)
{
rd.ReadByte();
}
}
}
if ((bitDepth % 8) != 0)
{
throw new ArgumentOutOfRangeException(String.Format(
"Invalid number of bits per sample {0:0} - must be a mulitple of 8",
bitDepth));
}
if (blockAlign != (numChannels * bitDepth / 8))
{
throw new ArgumentOutOfRangeException(String.Format(
"Invalid block align {0:0} - expected {1:0}",
blockAlign, numChannels * bitDepth / 8));
}
if (byteRate != sampleRate * blockAlign)
{
throw new ArgumentOutOfRangeException(String.Format(
"Invalid byte rate {0:0} - expected {1:0}",
byteRate, sampleRate * blockAlign));
}
pcmInfo.BitDepth = bitDepth;
pcmInfo.NumberOfChannels = numChannels;
pcmInfo.SampleRate = sampleRate;
pcmInfo.IsCompressed = compressionCode != 1;
foundWavFormatChunk = true;
break;
}
case "data":
{
if (input.Position + chunkSize > wavEndPos)
{
throw new ArgumentOutOfRangeException(String.Format(
"ChunkId {0} does not fit in RIFF chunk",
"data"));
}
dataLength = chunkSize;
foundWavDataChunk = true;
wavDataChunkPosition = input.Position;
// ensure we go past the PCM data, in case there are following chunks.
// (it's an unlikely scenario, but it's allowed by the WAV spec.)
input.Seek(chunkSize, SeekOrigin.Current);
break;
}
case "fact":
{
if (chunkSize == 4)
{
// 4 bytes
uint totalNumberOfSamples = rd.ReadUInt32();
// This value is unused, we are just reading it for debugging as we noticed that
// the WAV files generated by the Microsoft Audio Recorder
// contain the 'fact' chunk with this information. Most other recordings
// only contain the 'data' and 'fmt ' chunks.
}
else
{
rd.ReadBytes((int)chunkSize);
}
break;
}
case "JUNK":
case "bext":
case "minf":
case "regn":
case "umid":
case "DGDA":
case "wavl":
case "slnt":
case "cue ":
case "plst":
case "list":
case "labl":
case "note":
case "ltxt":
case "smpl":
case "inst":
default:
{
// Unsupported FOURCC codes, we skip.
rd.ReadBytes((int)chunkSize);
break;
}
}
}
if (!foundWavDataChunk)
{
throw new ArgumentOutOfRangeException("WAV 'data' chunk was not found !");
}
if (!foundWavFormatChunk)
{
throw new ArgumentOutOfRangeException("WAV 'fmt ' chunk was not found !");
}
if (input.Position != wavDataChunkPosition)
{
input.Seek(wavDataChunkPosition, SeekOrigin.Begin);
}
return(pcmInfo);
}
