AudioFile sample rate and pitch

eevee

Hello,
With the Gem Stereo, running the examples that load and play back audio files, if the project audio sample rate is the same as the recorded file, playback pitch is doubled. If I set the project sample rate to half, the pitch is correct.

I have tried with 'Sample Loader' and 'Sample Piezo Trigger'.

Is this a bug?

giuliomoro

Sample Loader seems fine.
Piezo Trigger is indeed broken: it should update gReadPtr only once per frame, something like this:

		for(unsigned int channel = 0; channel < context->audioOutChannels; channel++) {
			// If triggered...
			if(gReadPtr != -1)
				out = gSampleData[channel % gSampleData.size()][gReadPtr];	// ...read each sample...
			audioWrite(context, n, channel, out);
		}
		if(gReadPtr != -1) {
			gReadPtr++;
			if(gReadPtr >= (int)gSampleData[0].size())
				gReadPtr = -1;
		}

eevee

I noticed that, but even after fixing it, it plays twice as fast as it should. Sample Loader plays the waves double speed too.

giuliomoro

The above fix for piezo trigger works fine for me: as the increment of gReadPtr is outside the for channel loop, it only happens once per frame.

For sample loader it's not double speed, it's just that it is playing back only one second of the whole file: see

int gStartFrame = 44100;
int gEndFrame = 88200;