pvrecorder/src/miniaudio/examples/simple_looping.c

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/*
Shows one way to handle looping of a sound.
 
This example uses a decoder as the data source. Decoders can be used with the `ma_data_source` API which, conveniently,
supports looping via the `ma_data_source_read_pcm_frames()` API. To use it, all you need to do is pass a pointer to the
decoder straight into `ma_data_source_read_pcm_frames()` and it will just work.
*/
#define MINIAUDIO_IMPLEMENTATION
#include "../miniaudio.h"
 
#include <stdio.h>
 
void data_callback(ma_device* pDevice, void* pOutput, const void* pInput, ma_uint32 frameCount)
{
    ma_bool32 isLooping = MA_TRUE;
 
    ma_decoder* pDecoder = (ma_decoder*)pDevice->pUserData;
    if (pDecoder == NULL) {
        return;
    }
 
    /*
    A decoder is a data source which means you can seemlessly plug it into the ma_data_source API. We can therefore take advantage
    of the "loop" parameter of ma_data_source_read_pcm_frames() to handle looping for us.
    */
    ma_data_source_read_pcm_frames(pDecoder, pOutput, frameCount, NULL, isLooping);
 
    (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) {
        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;
    }
 
    printf("Press Enter to quit...");
    getchar();
 
    ma_device_uninit(&device);
    ma_decoder_uninit(&decoder);
 
    return 0;
}