flac.h

Go to the documentation of this file.

/* license:BSD-3-Clause
 * copyright-holders:Aaron Giles
 ***************************************************************************

 flac.h

 FLAC compression wrappers

***************************************************************************/

#pragma once

#ifndef __FLAC_H__
#define __FLAC_H__

#include <stdint.h>
#include "libchdr_zlib.h"
#include "FLAC/ordinals.h"
#include "FLAC/stream_decoder.h"

/***************************************************************************
 * TYPE DEFINITIONS
 ***************************************************************************
 */

typedef struct _flac_decoder flac_decoder;
struct _flac_decoder {
 /* output state */
 FLAC__StreamDecoder* decoder; /* actual encoder */
 uint32_t sample_rate; /* decoded sample rate */
 uint8_t channels; /* decoded number of channels */
 uint8_t bits_per_sample; /* decoded bits per sample */
 uint32_t compressed_offset; /* current offset in compressed data */
 const FLAC__byte * compressed_start; /* start of compressed data */
 uint32_t compressed_length; /* length of compressed data */
 const FLAC__byte * compressed2_start; /* start of compressed data */
 uint32_t compressed2_length; /* length of compressed data */
 int16_t * uncompressed_start[8]; /* pointer to start of uncompressed data (up to 8 streams) */
 uint32_t uncompressed_offset; /* current position in uncompressed data */
 uint32_t uncompressed_length; /* length of uncompressed data */
 int uncompressed_swap; /* swap uncompressed sample data */
 uint8_t custom_header[0x2a]; /* custom header */
};

/* ======================> flac_decoder */

void flac_decoder_init(flac_decoder* decoder);
void flac_decoder_free(flac_decoder* decoder);
int flac_decoder_reset(flac_decoder* decoder, uint32_t sample_rate, uint8_t num_channels, uint32_t block_size, const void *buffer, uint32_t length);
int flac_decoder_decode_interleaved(flac_decoder* decoder, int16_t *samples, uint32_t num_samples, int swap_endian);
uint32_t flac_decoder_finish(flac_decoder* decoder);

/* codec-private data for the CDFL codec */
typedef struct _cdfl_codec_data cdfl_codec_data;
struct _cdfl_codec_data {
 /* internal state */
 int swap_endian;
 flac_decoder decoder;
#ifdef WANT_SUBCODE
 zlib_codec_data subcode_decompressor;
#endif
 uint8_t* buffer;
};

/* cdfl compression codec */
chd_error cdfl_codec_init(void* codec, uint32_t hunkbytes);
void cdfl_codec_free(void* codec);
chd_error cdfl_codec_decompress(void *codec, const uint8_t *src, uint32_t complen, uint8_t *dest, uint32_t destlen);

#endif /* __FLAC_H__ */