Generate different kinds of wave forms

waves.m

        long maxSampleCount = SAMPLE_RATE * DURATION;
        long sampleCount = 0;
        UInt32 bytesToWrite = 2;
        double wavelengthInSamples = SAMPLE_RATE / hz;

        while (sampleCount < maxSampleCount) {
//            for (int i = 0; i < wavelengthInSamples; i++) {
//                // Square wave
//                SInt16 sample;
//                if (i < wavelengthInSamples/2) {
//                    sample = CFSwapInt16HostToBig(SHRT_MAX);
//                } else {
//                    sample = CFSwapInt16HostToBig(SHRT_MIN);
//                }
//
//                audioErr = AudioFileWriteBytes(audioFile, false, sampleCount*2, &bytesToWrite, &sample);
//                assert(audioErr == noErr);
//                sampleCount++;
//            }

//            for (int i=0; i<wavelengthInSamples; i++) {
//                // saw wave
//                SInt16 sample = CFSwapInt16HostToBig(((i / wavelengthInSamples) * SHRT_MAX * 2) - SHRT_MAX);
//                audioErr = AudioFileWriteBytes(audioFile, false, sampleCount*2, &bytesToWrite, &sample);
//                assert (audioErr == noErr);
//                sampleCount++;
//            }

            for (int i=0; i<wavelengthInSamples; i++) {
                // sine wave
                SInt16 sample = CFSwapInt16HostToBig((SInt16) SHRT_MAX * sin(2*M_PI * (i/wavelengthInSamples)));
                audioErr = AudioFileWriteBytes(audioFile, false, sampleCount*2, &bytesToWrite, &sample);
                assert (audioErr == noErr);
                sampleCount++;
            }


        }