Examples for AudioFileStream and AudioConverter?
Examples for AudioFileStream and AudioConverter?
- Subject: Examples for AudioFileStream and AudioConverter?
- From: Nick Zitzmann <email@hidden>
- Date: Tue, 9 Sep 2008 12:41:18 -0600
OK, I've searched around Google, I've read through the ConvertFile
sample source code, and now I need help. I am not new to Mac OS X
programming, but I am very new to CoreAudio programming.
Does anyone have any sample code that effectively ties AudioFileStream
and AudioConverter together?
Here's the story. I'm working with a file format that embeds MP3 data
in it. The MP3 data can be of any size and length, from a full-length
song to a split-second sound effect, and is often VBR I assume to
conserve space.
So far I've got the AudioFileStream part working. AudioFileStream
loads the data, I get the AudioStreamBasicDescription describing the
MP3 data, and I pass that to AudioConverterNew() along with my output
requirements - 44KHz native-endian 16-bit non-floating-point stereo
linear PCM for loading into an AudioBuffer later on in the program's
execution.
But now how do I process this correctly? I already tried the
deprecated (and much simpler) AudioConverterFillBuffer(), and found
out that it doesn't work with VBR data. Darn! So I tried
AudioConverterFillComplexBuffer(), and I'm hopelessly lost with that
function. The ConvertFile source code was kind of helpful, but it
dealt with AudioFiles instead of AudioFileStreams, and there are some
important differences between the two.
Also, AudioConverterGetProperty() is returning a ridiculous value when
I try to get the kAudioConverterPropertyMaximumInputPacketSize for VBR
packet sizes. The return value is 8192, which is kind of crazy
considering some of these MP3s are less than a kilobyte in size.
So again, does anyone have any sample code I could follow? I could
post my non-working code if requested...
Nick Zitzmann
<http://seiryu.home.comcast.net/>
S/MIME signature available upon request
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