I'm working on a project on the iPhone where I'm recording audio from the device mic using AVAudioRecorder, and then will be manipulating the recording.
To ensure that I'm reading in the samples from the file correctly, I'm using python's wave module to see if it returns the same samples.
However, python's wave module returns "fmt chunk and/or data chunk missing" when trying to open the wav file that is saved by AVAudioRecorder.
These are the settings I am using to record the file:
[audioSettings setObject:[NSNumber numberWithInt:kAudioFormatLinearPCM] forKey:AVFormatIDKey];
[audioSettings setObject:[NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey];
[audioSettings setObject:[NSNumber numberWithBool:NO] forKey:AVLinearPCMIsBigEndianKey];
[audioSettings setObject:[NSNumber numberWithFloat:4096] forKey:AVSampleRateKey];
[audioSettings setObject:[NSNumber numberWithInt:1] forKey:AVNumberOfChannelsKey];
[audioSettings setObject:[NSNumber numberWithBool:YES] forKey:AVLinearPCMIsNonInterleaved];
[audioSettings setObject:[NSNumber numberWithBool:NO] forKey:AVLinearPCMIsFloatKey];
After that, I'm just making a call to recordForDuration to actually do the recording.
The recording succeeds-- I can play the file etc, and I can read in the samples using AudioFile services, but I can't validate it because I can't open the file with Python's wave module.
This is what the first 128 bytes of the file look like:
1215N:~/Downloads$ od -c --read-bytes 128 testFile.wav
0000000 R I F F x H 001 \0 W A V E f m t
0000020 020 \0 \0 \0 001 \0 001 \0 @ 037 \0 \0 200 > \0 \0
0000040 002 \0 020 \0 F L L R 314 017 \0 \0 \0 \0 \0 \0
0000060 \0 \0 \0 \0 \0 \0 \0 \0 \0 \0 \0 \0 \0 \0 \0 \0
*
0000200
Any idea what I need to do to make sure a correct WAV header is written out by AVAudioRecorder?