protected override void OnFormatChange(AudioFormat audioFormat)
{
if (audioFormat.WaveFormat != WaveFormatType.Pcm)
throw new InvalidOperationException("MemoryAudioSink supports only PCM audio format.");
_format = audioFormat;
}
public static void WriteToWav(Stream RawData, Stream Output, AudioFormat AudioFormat)
{
if (AudioFormat.WaveFormat != WaveFormatType.Pcm) throw new ArgumentException("You can write only to WAV.");
BinaryWriter bwOutput = new BinaryWriter(Output);
//WAV header
bwOutput.Write("RIFF".ToCharArray());
bwOutput.Write((uint)(RawData.Length + 36));
bwOutput.Write("WAVE".ToCharArray());
bwOutput.Write("fmt ".ToCharArray());
bwOutput.Write((uint)0x10);
bwOutput.Write((ushort)0x01);
bwOutput.Write((ushort)AudioFormat.Channels);
bwOutput.Write((uint)AudioFormat.SamplesPerSecond);
bwOutput.Write((uint)(AudioFormat.BitsPerSample * AudioFormat.SamplesPerSecond * AudioFormat.Channels / 8));
bwOutput.Write((ushort)(AudioFormat.BitsPerSample * AudioFormat.Channels / 8));
bwOutput.Write((ushort)AudioFormat.BitsPerSample);
bwOutput.Write("data".ToCharArray());
bwOutput.Write((uint)RawData.Length);
long originalRawDataStreamPosition = RawData.Position;
RawData.Seek(0, SeekOrigin.Begin);
byte[] buffer = new byte[4096];
int read;
while ((read = RawData.Read(buffer, 0, 4096)) > 0)
{
bwOutput.Write(buffer, 0, read);
}
RawData.Seek(originalRawDataStreamPosition, SeekOrigin.Begin);
}
public void Load(byte[] audioData, AudioFormat format)
{
this.ClearGraph();
this.format = format;
this.audioData = audioData;
var graph = new PolyLineSegment();
int step = this.GetSampleStep();
int index = 0;
int count = 0;
double yScale = (this.audioCanvas.Height / 2) / short.MaxValue;
int leftSampleCount = audioData.Length / 4; //assume 2 channels
int actualLeftSampleCount = leftSampleCount / (step / 4);
while (index < audioData.Length)
{
short sample = BitConverter.ToInt16(new byte[2] { audioData[index], audioData[index + 1] }, 0);
double yPoint = sample * yScale + (this.audioCanvas.Height / 2);
double xPoint = count * this.audioCanvas.Width / actualLeftSampleCount;
graph.Points.Add(new Point() { X = xPoint, Y = yPoint });
index += step;
count++;
}
this.figure.Segments.Add(graph);
}
protected override void OnFormatChange(AudioFormat audioFormat)
{
if (this.Format != null)
{
throw new InvalidOperationException("Cannot change the audio format after it has already been set.");
}
this.Format = audioFormat;
}
public SupportedFormat(AudioFormat format)
{
this.format = format;
this.FriendlyName =
string.Format("{0}, {1}, {2}",
this.format.SamplesPerSecond,
this.format.BitsPerSample,
this.format.Channels);
}
protected override void OnFormatChange(AudioFormat audioFormat)
{
if (AudioFormat == null)
{
AudioFormat = audioFormat;
}
else
{
throw new InvalidOperationException();
}
}
protected override void OnFormatChange(wmAudioFormat audioFormat)
{
// We may need to do more with this.
ClientLogger.Debug("The audio format was changed: BitsPerSample = {0}, Channels = {1}, SamplesPerSecond = {2}",
AudioConstants.BitsPerSample, AudioConstants.Channels, audioFormat.SamplesPerSecond);
if (audioFormat.WaveFormat != WaveFormatType.Pcm ||
audioFormat.BitsPerSample != AudioConstants.BitsPerSample)
{
throw new ArgumentException("The audio format was not supported.");
}
wmAudioFormat = audioFormat;
RawAudioFormat = new AudioFormat(audioFormat.SamplesPerSecond);
}
public AudioDecoder(byte[] sourceData, AudioFormat format)
{
this.samplesPerSecond = format.SamplesPerSecond;
this.bitsPerSample = format.BitsPerSample;
this.channels = format.Channels;
byteRate = samplesPerSecond * channels * bitsPerSample / 8;
blockAlign = (short)(channels * (bitsPerSample / 8));
this.sourceData = sourceData;
this.memoryStream = new MemoryStream();
bufferByteCount = channels *
bitsPerSample / 8 * numSamples;
this.AudioBufferLength = 100;
}
protected override void OnFormatChange(wmAudioFormat audioFormat)
{
// We may need to do more with this.
if (audioFormat == null ||
audioFormat.WaveFormat != WaveFormatType.Pcm ||
audioFormat.BitsPerSample != AudioConstants.BitsPerSample)
{
throw new ArgumentException("The audio format was not supported.");
}
// Only change the audio context factory if the raw audio format has actually changed.
var rawAudioFormat = new AudioFormat(audioFormat.SamplesPerSecond, AudioConstants.MillisecondsPerFrame, audioFormat.Channels, audioFormat.BitsPerSample);
if (_audioContextFactory == null || _audioContextFactory.RawAudioFormat != rawAudioFormat)
{
_audioContextFactory = GetAudioContextFactory(rawAudioFormat, _playedAudioFormat, _mediaConfig, _mediaEnvironment);
_logger.RawAudioFormat = rawAudioFormat;
ClientLogger.Debug("The recorded audio format was changed: BitsPerSample = {0}, Channels = {1}, SamplesPerSecond = {2}",
rawAudioFormat.BitsPerSample, rawAudioFormat.Channels, rawAudioFormat.SamplesPerSecond);
}
}
protected override void OnFormatChange(AudioFormat audioFormat)
{
if (audioFormat.WaveFormat == WaveFormatType.Pcm)
{
speexEncoder.init(2, 8, audioFormat.SamplesPerSecond, audioFormat.Channels);
pcmPacketSize = 2 * speexEncoder.getChannels() * speexEncoder.getFrameSize();
temp = new byte[pcmPacketSize];
tempOffset = 0;
if (writer != null)
writer.close();
writer = new org.xiph.speex.OggSpeexWriter(2, audioFormat.SamplesPerSecond, audioFormat.Channels, 1, false);
memFile = new RandomOutputStream(new MemoryStream(2 * 1024 * pcmPacketSize));
writer.open(memFile);
writer.writeHeader("Encoded with Speex");
}
else
{
throw new Exception("Codec not supported");
}
}
protected override void OnFormatChange(AudioFormat Format)
{
}
protected override void OnFormatChange(AudioFormat audioFormat)
{
if (this.audioFormatSet)
throw new AudioFormatChangedException(
"Cannot change the audio format after it has already been assigned. I'm lazy like that.");
this.audioFormatSet = true;
this.AudioFormat = audioFormat;
}
/// <summary>
/// 音频格式更改
/// 第一次捕获时会调用一次，此后便确定格式
/// </summary>
/// <param name="audioFormat"></param>
protected override void OnFormatChange(AudioFormat audioFormat)
{
Format = audioFormat;
}
public static void WriteHeaderStart(Stream str, AudioFormat fmt) {
WriteHeader(str, (short) fmt.Channels, (short) fmt.BitsPerSample, (uint) fmt.SamplesPerSecond, 0);
}
protected override void OnFormatChange(AudioFormat audioFormat)
{
throw new NotImplementedException();
}
protected override void OnFormatChange(AudioFormat audioFormat) {
Recorder.audioFormat = audioFormat;
}
protected abstract void OnFormatChange (AudioFormat audioFormat);
public AudioFormatEx(AudioFormat audioFormat)
: this(audioFormat.WaveFormat, audioFormat.Channels, audioFormat.BitsPerSample, audioFormat.SamplesPerSecond
)
{
}
/***************************************下面是音频保存相关操作****************************************/
/// <summary>
/// 添加WAV header
/// </summary>
/// <param name="audioByteLength"></param>
/// <param name="audioFormat"></param>
/// <returns></returns>
public void SavePcmToWav(Stream rawData, Stream output, AudioFormat audioFormat)
{
if (audioFormat.WaveFormat != WaveFormatType.Pcm)
throw new ArgumentException("Only PCM coding is supported.");
BinaryWriter bwOutput = new BinaryWriter(output);
bwOutput.Write("RIFF".ToCharArray());
bwOutput.Write((uint)(rawData.Length + 36));
bwOutput.Write("WAVE".ToCharArray());
bwOutput.Write("fmt ".ToCharArray());
bwOutput.Write((uint)0x10);
bwOutput.Write((ushort)0x01);
bwOutput.Write((ushort)audioFormat.Channels);
bwOutput.Write((uint)audioFormat.SamplesPerSecond);
bwOutput.Write((uint)(audioFormat.BitsPerSample * audioFormat.SamplesPerSecond * audioFormat.Channels / 8));
bwOutput.Write((ushort)(audioFormat.BitsPerSample * audioFormat.Channels / 8));
bwOutput.Write((ushort)audioFormat.BitsPerSample);
bwOutput.Write("data".ToCharArray());
bwOutput.Write((uint)rawData.Length);
long originalRawDataStreamPosition = rawData.Position;
rawData.Seek(0, SeekOrigin.Begin);
byte[] buffer = new byte[4096];
int read;
while ((read = rawData.Read(buffer, 0, 4096)) > 0)
{
bwOutput.Write(buffer, 0, read);
}
rawData.Seek(originalRawDataStreamPosition, SeekOrigin.Begin);
}
public static AudioFormat ToAudioFormat(this SLAudioFormat self)
{
return(new AudioFormat(self.WaveFormat.ToRawAudioEncoding(), self.BitsPerSample, self.Channels, self.SamplesPerSecond));
}
