/*
 * Copyright (c) 2003-2004, Marcus Overhagen
 * All rights reserved.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER OR CONTRIBUTORS 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.
 */
#ifndef _AU_H
#define _AU_H

struct snd_header { 
        uint32 magic;                   // magic number '.snd'
        uint32 data_start;              // offset to the data
        uint32 data_size;               // number of bytes of data
        uint32 data_format;             // data format code
        uint32 sampling_rate;   // sampling rate
        uint32 channel_count;   // number of channels
        char info[4];                   // optional text information, NULL termintated, at least 4 bytes
};

enum {
        SND_FORMAT_UNSPECIFIED = 0,     // unspecified format
        SND_FORMAT_MULAW_8 = 1,         // 8-bit mu-law samples 
        SND_FORMAT_LINEAR_8 = 2,        // 8-bit linear samples 
        SND_FORMAT_LINEAR_16 = 3,       // 16-bit linear samples 
        SND_FORMAT_LINEAR_24 = 4,       // 24-bit linear samples 
        SND_FORMAT_LINEAR_32 = 5,       // 32-bit linear samples 
        SND_FORMAT_FLOAT = 6,           // 32-bit IEEE floating-point samples 
        SND_FORMAT_DOUBLE = 7,          // 64-bit IEEE floating-point samples 
        SND_FORMAT_INDIRECT = 8,        // fragmented sampled data 
        SND_FORMAT_NESTED = 9,
        SND_FORMAT_DSP_CORE = 10,       // DSP program 
        SND_FORMAT_DSP_DATA_8 = 11,     // 8-bit fixed-point samples 
        SND_FORMAT_DSP_DATA_16 = 12,// 16-bit fixed-point samples 
        SND_FORMAT_DSP_DATA_24 = 13,// 24-bit fixed-point samples 
        SND_FORMAT_DSP_DATA_32 = 14,// 32-bit fixed-point samples 
        SND_FORMAT_15 = 15,
        SND_FORMAT_DISPLAY = 16,        // non-audio display data 
        SND_FORMAT_MULAW_SQUELCH = 17,
        SND_FORMAT_EMPHASIZED = 18,     // 16-bit linear with emphasis 
        SND_FORMAT_COMPRESSED = 19,     // 16-bit linear with compression 
        SND_FORMAT_COMPRESSED_EMPHASIZED = 20, // A combination of the two above 
        SND_FORMAT_DSP_COMMANDS = 21,// Music Kit DSP commands 
        SND_FORMAT_DSP_COMMANDS_SAMPLES = 22,
        SND_FORMAT_ADPCM_G721 = 23,
        SND_FORMAT_ADPCM_G722 = 24,
        SND_FORMAT_ADPCM_G723_3 = 25,
        SND_FORMAT_ADPCM_G723_5 = 26,
        SND_FORMAT_ALAW_8 = 27,
};

#define SND_RATE_8012   8012.821        // CODEC input
#define SND_RATE_22050  22050.0         // low sampling rate output
#define SND_RATE_44100  44100.0         // high sampling rate output

#define SND_MAGIC 0x2e736e64            // '.snd'

#endif