I have to encode raw PCM data (input) in some specific format for eg Apple lossless ('alac') (output) using scaudiofillbuffer API can someone help me in this regard.
My doubts are as follows: - How do I set the AudioStreamBasicDescription for the input? I tried to set some default values (like given below) but when I do QTSetComponentProperty with the 'asbd' it returns me -206.
asbd.mFormatID = kAudioFormatLinearPCM;
asbd.mSampleRate = 44100.0; // or whatever the sample rate is
asbd.mFramesPerPacket = 1; // For PCM, frames per packet is always 1
asbd.mBytesPerFrame = 4; // for PCM, frames per packet and bytes per packet
are equivalent
asbd.mChannelsPerFrame = 2;
asbd.mBitsPerChannel = 16;
- and, What exactly should the callback SCAudioInputDataProc (callback passed to scaudiofillbuffer) do?
Can anyone outline the whole procedure for the same as I have been trying different things with the API/scaudiocompress and not reaching anywhere.
Thanks Sandeep
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