Garbled iPhone5 playback

[psugihara]

I'm recording MP3's with mono input and mono output on an iPhone 4 and iPhone 4S and they playback fine on those devices. They also play fine on my mac.

However, on the iPhone 5 they're low pitched and garbled. I haven't tried them on an iPad.

Any ideas? I'll be poking around and I'll let you know if I figure it out.

Thanks!

[psugihara]

Here's a file I recorded this way: http://cl.ly/3r2N2j1U361e

Right now, I'm trying to copy it to a ring buffer but it's only playing the first .1 seconds or so.

AudioFileReader *fileReader = [[AudioFileReader alloc]
                               initWithAudioFileURL:inputFileURL
                               samplingRate:_audioManager.samplingRate
                               numChannels:1];

[fileReader play];
fileReader.currentTime = 0.0;

_loopLength = [fileReader getDuration] * _audioManager.samplingRate;

float data[_loopLength];
[fileReader retrieveFreshAudio:data
                     numFrames:_loopLength
                   numChannels:1];

_loopBuffer->AddNewFloatData(data, _loopLength);

[self startPlayback];

Is it because the sample is so short?

[psugihara]

Alright, I got this to work by making the following change in the init function of AudioFileReader. The buffer sizes weren't "big enough" because I was reading the whole thing at a time maybe?

    // Arbitrary buffer sizes that don't matter so much as long as they're "big enough"
    self.outputBufferSize = MAX_LOOP_LENGTH;
    self.numSamplesReadPerPacket = MAX_LOOP_LENGTH;
    self.desiredPrebufferedSamples = self.numSamplesReadPerPacket*2;
    self.outputBuffer = (float *)calloc((int)self.outputBufferSize, sizeof(float));
    self.holdingBuffer = (float *)calloc((int)self.desiredPrebufferedSamples, sizeof(float));

[alexbw]

Package this up in a pull request, if you have the time?