Test application

/*
 *  This extra small demo sends a random samples to your speakers.
 */

#include <stdio.h>
#include <unistd.h>
#include "../include/alsa/asoundlib.h"

static char *device = "playback_0";           /* playback device */
snd_output_t *output = NULL;
//unsigned char buffer[16*1024];              /* some random data */
unsigned char buffer[1024 * 16];              /* some random data */
static const char *help="usage: ./program wav_file.wav\n";

int main(int argc, char *argv[])
{
    int err;
    unsigned int i;
    snd_pcm_t *handle;
    snd_pcm_sframes_t frames;
    int rret;
    static snd_output_t *output = NULL;

    FILE *file;

    if (argc < 2) {
        printf("%s", help);
        return -1;
    }

    if ((err = snd_pcm_open(&handle, device, SND_PCM_STREAM_PLAYBACK, 0)) < 0) {
        printf("Playback open error: %s\n", snd_strerror(err));
        exit(EXIT_FAILURE);
    }
    if ((err = snd_pcm_set_params(handle,
                                  SND_PCM_FORMAT_S16_LE,
                                  SND_PCM_ACCESS_RW_INTERLEAVED,
                                  2,
                                  44100,
                                  1,
                                  500000)) < 0) {   /* 0.5sec */
        printf("Playback open error: %s\n", snd_strerror(err));
        exit(EXIT_FAILURE);
    }

    if ( (file = fopen(argv[1], "rb")) == NULL) {
        printf("Can not open the wav file !");
        return -1;
    }

    err = snd_output_stdio_attach(&output, stdout, 0);
    if (err < 0) {
        printf("Output failed: %s\n", snd_strerror(err));
        return 0;
    }

    snd_pcm_dump(handle, output);

   while ( (rret = fread(buffer, 1024 * 2, 4, file))) {
        printf("rret = %d\n", rret);
        frames = snd_pcm_writei(handle, buffer, 1024 * 2);
        printf("snd_pcm_writei:frames: %d\n", frames);
        if (frames < 0)
                frames = snd_pcm_recover(handle, frames, 0);
        if (frames < 0) {
                printf("snd_pcm_writei failed: %s\n", snd_strerror(err));
                break;
        }
        if (frames > 0 && frames < (long)sizeof(buffer))
                printf("Short write (expected %li, wrote %li)\n", (long)sizeof(buffer), frames);

        // sleep needed to see that the frame is repeated.
        usleep(5000000);
    }

    snd_pcm_close(handle);
    return 0;
}