On May 14, 2005, at 13:26 , Nicolas Plourde wrote:
The attached patch, adds to the requested format the number of channels. commited. thank you.
The audio is still quite quirky: kAudioStreamPropertyPhysicalFormatMatch will still try to return a mono stream format most of the times. Point is, apparently, less you provide, better the result wil be. In the end, CoreAudio will ALWAYS give you 32 bits float audio anyway so, there's no reason to ask anything else; mBytesPerPacket and mBytesPerFrame will be used even if the audio format is not what you asked, so setting them will lead to 32 bits MONO if you asked 16 bits STEREO. The attached patch simplifies the format matching logic, yelding at worst the same results as before, and fixing the "unwanted mono" malfunction in many cases. It still works fine under Mac OS X 10.3.9.