/* tinyplay.c
**
** Copyright 2011, The Android Open Source Project
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are met:
**     * Redistributions of source code must retain the above copyright
**       notice, this list of conditions and the following disclaimer.
**     * Redistributions in binary form must reproduce the above copyright
**       notice, this list of conditions and the following disclaimer in the
**       documentation and/or other materials provided with the distribution.
**     * Neither the name of The Android Open Source Project nor the names of
**       its contributors may be used to endorse or promote products derived
**       from this software without specific prior written permission.
**
** THIS SOFTWARE IS PROVIDED BY The Android Open Source Project ``AS IS'' AND
** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
** ARE DISCLAIMED. IN NO EVENT SHALL The Android Open Source Project BE LIABLE
** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
** SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
** DAMAGE.
*/

#include <tinyalsa/asoundlib.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>

#define ID_RIFF 0x46464952
#define ID_WAVE 0x45564157
#define ID_FMT  0x20746d66
#define ID_DATA 0x61746164

#define FORMAT_PCM 1

struct wav_header {
    uint32_t riff_id;
    uint32_t riff_sz;
    uint32_t riff_fmt;
    uint32_t fmt_id;
    uint32_t fmt_sz;
    uint16_t audio_format;
    uint16_t num_channels;
    uint32_t sample_rate;
    uint32_t byte_rate;
    uint16_t block_align;
    uint16_t bits_per_sample;
    uint32_t data_id;
    uint32_t data_sz;
};

void play_sample(FILE *file, unsigned int channels, unsigned int rate,
                 unsigned int bits);

int main(int argc, char **argv)
{
    FILE *file;
    struct wav_header header;

    if (argc != 2) {
        fprintf(stderr, "Usage: %s <file.wav>\n", argv[0]);
        return 1;
    }

    file = fopen(argv[1], "rb");
    if (!file) {
        fprintf(stderr, "Unable to open file '%s'\n", argv[1]);
        return 1;
    }

    fread(&header, sizeof(struct wav_header), 1, file);

    if ((header.riff_id != ID_RIFF) ||
        (header.riff_fmt != ID_WAVE) ||
        (header.fmt_id != ID_FMT) ||
        (header.audio_format != FORMAT_PCM) ||
        (header.fmt_sz != 16)) {
        fprintf(stderr, "Error: '%s' is not a PCM riff/wave file\n", argv[1]);
        fclose(file);
        return 1;
    }

    play_sample(file, header.num_channels, header.sample_rate,
                header.bits_per_sample);

    fclose(file);

    return 0;
}

void play_sample(FILE *file, unsigned int channels, unsigned int rate,
                 unsigned int bits)
{
    struct pcm_config config;
    struct pcm *pcm;
    char *buffer;
    int size;
    int num_read;

    config.channels = channels;
    config.rate = rate;
    config.period_size = 1024;
    config.period_count = 4;
    if (bits == 32)
        config.format = PCM_FORMAT_S32_LE;
    else if (bits == 16)
        config.format = PCM_FORMAT_S16_LE;

    pcm = pcm_open(0, 0, PCM_OUT, &config);
    if (!pcm || !pcm_is_ready(pcm)) {
        fprintf(stderr, "Unable to open PCM device (%s)\n",
                pcm_get_error(pcm));
        return;
    }

    size = pcm_get_buffer_size(pcm);
    buffer = malloc(size);
    if (!buffer) {
        fprintf(stderr, "Unable to allocate %d bytes\n", size);
        free(buffer);
        pcm_close(pcm);
        return;
    }

    printf("Playing sample: %u ch, %u hz, %u bit\n", channels, rate, bits);

    do {
        num_read = fread(buffer, 1, size, file);
        if (num_read > 0) {
            if (pcm_write(pcm, buffer, num_read)) {
                fprintf(stderr, "Error playing sample\n");
                break;
            }
        }
    } while (num_read > 0);

    free(buffer);
    pcm_close(pcm);
}