Converting NSData to AVAudioPCMBuffer

Question

I've got a data stream, specifically coming from an MP3 stream. In an attempt to convert it to an AVAudioPCBBuffer, I'm creating an AVAudioFormat to describe it as follows:

AVAudioFormat* format = [[AVAudioFormat alloc] initWithStreamDescription:&description];

when printing format the output is:

<AVAudioFormat 0x2818944b0:  2 ch,  48000 Hz, '.mp3' (0x00000000) 0 bits/channel, 0 bytes/packet, 1152 frames/packet, 0 bytes/frame>

Now, when I'm trying to initialize the AVAudioPCMBuffer like this:

AVAudioPCMBuffer* pcbBuffer = [[AVAudioPCMBuffer alloc] initWithPCMFormat:format frameCapacity:frameCount];

I get an exception:

required condition is false: isPCMFormat(fmt)

What am I doing wrong?

Thanks

Answer 1

You're using the wrong AVAudioBuffer subclass. AVAudioPCMBuffer is for uncompressed "Pulse-code modulation" audio. You want AVAudioCompressedBuffer instead.