/// <summary>
/// Constructs a stream that will accept PCM audio input, and automatically encode it to Opus and packetize it using Ogg,
/// writing the output pages to an underlying stream (usually a file stream).
/// You are allowed to change the encoding parameters mid-stream using the properties of the OpusEncoder; the only thing you
/// cannot change is the sample rate and num# of channels.
/// </summary>
/// <param name="encoder">An opus encoder to use for output</param>
/// <param name="outputStream">A base stream to accept the encoded ogg file output</param>
/// <param name="fileTags">(optional) A set of tags to include in the encoded file</param>
/// <param name="inputSampleRate">The actual real sample rate of your input data (NOT the encoder's sample rate).
/// The opus encoder usually requires 48Khz input, but most MP3s and such will give you 44.1Khz. To get the
/// sample rates to line up properly in this case, set the encoder to 48000 and pass inputSampleRate = 44100,
/// and the write stream will perform resampling for you automatically (Note that resampling will slow down
/// the encoding).</param>
public OpusOggWriteStream(OpusEncoder encoder, Stream outputStream, OpusTags fileTags = null, int inputSampleRate = 0, int logicalStreamId = 0)
{
_encoder = encoder;
if (_encoder.UseDTX)
{
throw new ArgumentException("DTX is not currently supported in Ogg streams");
}
_inputSampleRate = inputSampleRate;
if (_inputSampleRate == 0)
{
_inputSampleRate = _encoder.SampleRate;
}
if (logicalStreamId == 0)
{
logicalStreamId = new Random().Next();
}
_logicalStreamId = logicalStreamId;
_encoderSampleRate = encoder.SampleRate;
_inputChannels = encoder.NumChannels;
_outputStream = outputStream;
_opusFrameIndex = 0;
_granulePosition = 0;
_opusFrameSamples = (int)((long)_encoderSampleRate * FRAME_SIZE_MS / 1000);
_opusFrame = new short[_opusFrameSamples * _inputChannels];
_crc = new Crc();
_resampler = SpeexResampler.Create(_inputChannels, _inputSampleRate, _encoderSampleRate, 5);
BeginNewPage();
WriteOpusHeadPage();
WriteOpusTagsPage(fileTags);
}
/// <summary>
/// Constructs a stream that will accept PCM audio input, and automatically encode it to Opus and packetize it using Ogg,
/// writing the output pages to an underlying stream (usually a file stream).
/// You are allowed to change the encoding parameters mid-stream using the properties of the OpusEncoder; the only thing you
/// cannot change is the sample rate and num# of channels.
/// </summary>
/// <param name="outputStream">A base stream to accept the encoded ogg file output</param>
/// <param name="sampleRate"></param>
/// <param name="channelCount"></param>
/// <param name="preSkip"></param>
/// <param name="sampleCount"></param>
/// <param name="fileTags">(optional) A set of tags to include in the encoded file</param>
/// <param name="inputSampleRate">The actual real sample rate of your input data (NOT the encoder's sample rate).
/// The opus encoder usually requires 48Khz input, but most MP3s and such will give you 44.1Khz. To get the
/// sample rates to line up properly in this case, set the encoder to 48000 and pass inputSampleRate = 44100,
/// and the write stream will perform resampling for you automatically (Note that resampling will slow down
/// the encoding).</param>
public OpusOggWriteStream(Stream outputStream, int sampleRate, int channelCount, int preSkip, int sampleCount = -1, OpusTags fileTags = null, int inputSampleRate = 0)
{
_inputSampleRate = inputSampleRate;
if (_inputSampleRate == 0)
{
_inputSampleRate = sampleRate;
}
_logicalStreamId = new Random().Next();
_encoderSampleRate = sampleRate;
_inputChannels = channelCount;
_outputStream = outputStream;
//_opusFrameIndex = 0;
_granulePosition = 0;
_opusFrameSamples = (int)((long)_encoderSampleRate * FRAME_SIZE_MS / 1000);
_opusFrame = new short[_opusFrameSamples * _inputChannels];
_crc = new Crc();
_resampler = SpeexResampler.Create(_inputChannels, _inputSampleRate, _encoderSampleRate, 5);
_preSkipSamples = preSkip;
_sampleCount = sampleCount == -1 ? int.MaxValue : preSkip + sampleCount;
BeginNewPage();
WriteOpusHeadPage();
WriteOpusTagsPage(fileTags);
}