private void InitializeDecoder(AudioFormat audioFormat)
{
if (_decoder != null)
{
return;
}
if (audioFormat == AudioFormat.ALAC)
{
// RTP info: 96 AppleLossless, 96 352 0 16 40 10 14 2 255 0 0 44100
// (ALAC -> PCM)
var frameLength = 352;
var numChannels = 2;
var bitDepth = 16;
var sampleRate = 44100;
_decoder = new ALACDecoder(_clConfig.ALACLibPath);
_decoder.Config(sampleRate, numChannels, bitDepth, frameLength);
}
else if (audioFormat == AudioFormat.AAC)
{
// RTP info: 96 mpeg4-generic/44100/2, 96 mode=AAC-main; constantDuration=1024
// (AAC-MAIN -> PCM)
var frameLength = 1024;
var numChannels = 2;
var bitDepth = 16;
var sampleRate = 44100;
_decoder = new AACDecoder(_clConfig.AACLibPath, TransportType.TT_MP4_RAW, AudioObjectType.AOT_AAC_MAIN, 1);
_decoder.Config(sampleRate, numChannels, bitDepth, frameLength);
}
else if (audioFormat == AudioFormat.AAC_ELD)
{
// RTP info: 96 mpeg4-generic/44100/2, 96 mode=AAC-eld; constantDuration=480
// (AAC-ELD -> PCM)
var frameLength = 480;
var numChannels = 2;
var bitDepth = 16;
var sampleRate = 44100;
_decoder = new AACDecoder(_clConfig.AACLibPath, TransportType.TT_MP4_RAW, AudioObjectType.AOT_ER_AAC_ELD, 1);
_decoder.Config(sampleRate, numChannels, bitDepth, frameLength);
}
else
{
// (PCM -> PCM)
// Not used
_decoder = new PCMDecoder();
}
}
