wav_header.h

#ifndef _WAV_HEADER_H_
#define _WAV_HEADER_H_
/*
 *  Format of WAVE (.wav) files.  This is a minimal definition and
 *  ignores externsions as well as other RIFF variants.
 *  Based upon ccrma.stanford.edu/courses/422/projects/WaveFormat/
 *
 *  Copyright (C) 2015  Nest Labs. All rights reserved.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#include <stdint.h>

#define RIFF_ID			0x46464952	/* 'RIFF' */
#define WAVE_ID			0x45564157	/* 'WAVE' */
#define FMT_ID			0x20746d66	/* 'fmt ' */
#define DATA_ID			0x61746164	/* 'data' */

#define WAVE_FORMAT_PCM		1

typedef struct wave_header_s {
    uint32_t chunk_id;
    uint32_t chunk_size;
    uint32_t format;

    /* "fmt " sub-chunk */
    uint32_t subchunk1_id;
    uint32_t subchunk1_size;
    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;

    /* "data" sub-chunk */
    uint32_t subchunk2_id;
    uint32_t subchunk2_size;
    int16_t  data[0];			/* variable size */
} wave_header_t;

#define WAVE_HDR_SIZE		sizeof(wave_header_t)

#define PCM_CHUNK_SIZE		16	/* XXXehs: redo with offsetof? */

#endif /* _WAV_HEADER_H_ */