public PendingQueue(int encodedBuffersCount, iAudioDecoder decoder, iPlayerQueues queues)
{
this.decoder = decoder;
this.queues = queues;
encodedFrames = new Queue <AudioFrame>(encodedBuffersCount);
copiesCompressedData = decoder.copiesCompressedData;
}
public static void setupHardware(IntPtr pcm, iAudioDecoder decoder, int decodedBuffers)
{
Span <byte> hw_params = stackalloc byte[libasound.pcm_hw_params_sizeof()];
libasound.snd_pcm_hw_params_any(pcm, hw_params);
libasound.snd_pcm_hw_params_set_access(pcm, hw_params, ePcmAccessType.MemoryMapInterleaved);
libasound.snd_pcm_hw_params_set_format(pcm, hw_params, ePcmFormat.S16);
// See ConfigureDecoder.configureAacDecoder method
libasound.snd_pcm_hw_params_set_channels(pcm, hw_params, 2);
int sampleRate = decoder.sampleRate;
if (libasound.snd_pcm_hw_params_test_rate(pcm, hw_params, sampleRate, eDirection.Exact))
{
libasound.snd_pcm_hw_params_set_rate(pcm, hw_params, sampleRate, eDirection.Exact);
Logger.logVerbose("The audio hardware supports {0}Hz sample rate of the audio track", sampleRate);
}
else
{
// Enable software resampling
libasound.snd_pcm_hw_params_set_rate_resample(pcm, hw_params, true);
libasound.snd_pcm_hw_params_set_rate(pcm, hw_params, sampleRate, eDirection.Exact);
Logger.logVerbose("The audio driver will resample {0}Hz sample rate of the audio track", sampleRate);
}
libasound.snd_pcm_hw_params_set_period_size(pcm, hw_params, decoder.blockSize, eDirection.Exact);
libasound.snd_pcm_hw_params_set_buffer_size(pcm, hw_params, decoder.blockSize * decodedBuffers);
libasound.snd_pcm_hw_params(pcm, hw_params);
}
public static void setupSoftware(IntPtr pcm, iAudioDecoder decoder, int decodedBuffers)
{
Span <byte> sw_params = stackalloc byte[libasound.pcm_sw_params_sizeof()];
libasound.snd_pcm_sw_params_current(pcm, sw_params);
libasound.snd_pcm_sw_params_set_avail_min(pcm, sw_params, decoder.blockSize);
// libasound.snd_pcm_sw_params_set_start_threshold( pcm, sw_params, trackInfo.samplesPerFrame * ( decodedBuffers - 1 ) );
libasound.snd_pcm_sw_params_set_start_threshold(pcm, sw_params, 0);
// libasound.snd_pcm_sw_params_set_period_event( pcm, sw_params, true );
libasound.snd_pcm_sw_params(pcm, sw_params);
}
public AlsaPlayer(iAudioDecoder decoder)
{
try
{
handle = new PcmHandle(Setup.openDefaultOutput());
}
catch (Exception ex)
{
throw new ApplicationException("Unable to open the default audio device", ex);
}
int computedCount = (int)Math.Ceiling(0.001 * msDecodedBufferLength * decoder.sampleRate / decoder.blockSize);
int decodedBuffers = Math.Max(computedCount, minDecodedBuffers);
// Logger.logVerbose( "Got the wave output device" );
try
{
Setup.setupHardware(handle, decoder, decodedBuffers);
Setup.setupSoftware(handle, decoder, decodedBuffers);
// Logger.logVerbose( "Set up the wave output device" );
handle.prepare();
}
catch (Exception ex)
{
// Logger.logError( "Unable to setup audio playback\n" + ex.ToString() );
throw new ApplicationException("Unable to setup audio playback", ex);
}
// handle.dbgDumpPcm();
// handle.dbgDumpSetup();
// handle.dbgDumpStatus();
pollHandlesCount = handle.pollDescriptorsCount;
samplesPerFrame = decoder.blockSize;
queue = new Queue(decodedBuffers);
state = eState.Prepared;
Logger.logVerbose("Initialized ALSA player with {0} decoded buffers; state = {1}; poll handles count {2}", decodedBuffers, handle.state, pollHandlesCount);
// handle.dbgLogAvailableSamples();
}
public static extern void createDcaDecoder([MarshalAs(UnmanagedType.CustomMarshaler, MarshalTypeRef = typeof(Marshaler <iAudioDecoder>))] out iAudioDecoder decoder, byte channels, int sampleRate);