distort_on_seek.cpp

/*
Demonstrates an issue with certain aiff/wav files, where seeking can result in distorted output.

*/
#define MA_DEBUG_OUTPUT
#define MINIAUDIO_IMPLEMENTATION
#include <miniaudio.h>

#include <stdio.h>

void data_callback(ma_device* pDevice, void* pOutput, const void* pInput, ma_uint32 frameCount)
{
    ma_decoder* pDecoder = (ma_decoder*)pDevice->pUserData;
    if (pDecoder == NULL) {
        return;
    }

    ma_decoder_read_pcm_frames(pDecoder, pOutput, frameCount, NULL);

    (void)pInput;
}

int main(int argc, char** argv)
{
    ma_result result;
    ma_decoder decoder;
    ma_device_config deviceConfig;
    ma_device device;

    if (argc < 2) {
        printf("No input file.\n");
        return -1;
    }

    result = ma_decoder_init_file(argv[1], NULL, &decoder);
    if (result != MA_SUCCESS) {
      printf("Could not load file: %s\n", argv[1]);
      return -2;
    }

    deviceConfig = ma_device_config_init(ma_device_type_playback);
    deviceConfig.playback.format   = decoder.outputFormat;
    deviceConfig.playback.channels = decoder.outputChannels;
    deviceConfig.sampleRate        = decoder.outputSampleRate;
    deviceConfig.dataCallback      = data_callback;
    deviceConfig.pUserData         = &decoder;

    if (ma_device_init(NULL, &deviceConfig, &device) != MA_SUCCESS) {
        printf("Failed to open playback device.\n");
        ma_decoder_uninit(&decoder);
        return -3;
    }

    if (ma_device_start(&device) != MA_SUCCESS) {
        printf("Failed to start playback device.\n");
        ma_device_uninit(&device);
        ma_decoder_uninit(&decoder);
        return -4;
    }

    // output a bit of statistics

    printf("device.playback.channels: %i\n", device.playback.channels);
    printf("input format: %d\n", decoder.outputFormat);
    printf("input channels: %d\n", decoder.outputChannels);
    printf("input sampleRate: %d\n", decoder.outputSampleRate);

    ma_uint64 lengthInPCMFrames = 0;
    result = ma_data_source_get_length_in_pcm_frames(&decoder, &lengthInPCMFrames);

    printf("input number of frames: %llu \n", lengthInPCMFrames);

    printf("Press Enter to seek (you might want to turn down your speakers first :-)");
    getchar();

    result = ma_data_source_seek_to_pcm_frame(&decoder, lengthInPCMFrames/2);
  
    printf("Press Enter to quit...");
    getchar();

    ma_device_uninit(&device);
    ma_decoder_uninit(&decoder);

    return 0;
}