AudioFile API vs. IMA-in-WAV-type files
AudioFile API vs. IMA-in-WAV-type files
- Subject: AudioFile API vs. IMA-in-WAV-type files
- From: Evan Olcott <email@hidden>
- Date: Thu, 8 Jun 2006 12:32:25 -0500
Trying to use the CAAudioFile API to read either of these files:
http://www.igorlabs.com/etc/dirtsurface1C.wav
http://www.igorlabs.com/etc/fort_cruise_missile16_11_looped_i.wav
Both of these files read and play with Quicktime Player.
When I ask for the stream format, I get no error return but the
stream format comes up cleared out and empty... it's the last section
here I call "set up audio convertor"
---
err = FSPathMakeRef((const UInt8 *)[fileName
fileSystemRepresentation], &sourceFileRef, NULL);
if (err) goto _error;
err = AudioFileOpen(&sourceFileRef, fsRdPerm, 0, &importFileID);
if (err) goto _error;
// make import file buffer
size = sizeof(maxPacketSize);
err = AudioFileGetProperty(importFileID,
kAudioFilePropertyMaximumPacketSize, &size, &maxPacketSize);
if (err) goto _error;
importFileBufferSize = maxPacketSize;
if (importFileBufferSize < 16) importFileBufferSize = 4096; // if
PCM, make a respectable size
importFileBuffer = malloc(importFileBufferSize);
// get total number of packets
size = sizeof(totalPackets);
err = AudioFileGetProperty(importFileID,
kAudioFilePropertyAudioDataPacketCount, &size, &totalPackets);
if (err) goto _error;
// set up audio convertor
size = sizeof(AudioStreamBasicDescription);
err = AudioFileGetProperty(importFileID,
kAudioFilePropertyDataFormat, &size, &sourceFileFormat);
if (err) goto _error;
---
The other returns (max packet size, audio data packet count) seem to
return valid enough values...anyone have any idea what I'm missing?
-ev
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