winamp/Src/alac/decomp.h

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2024-09-24 12:54:57 +00:00
/* copyright 2006 David Hammerton, Ben Allison */
#ifndef __ALAC__DECOMP_H
#define __ALAC__DECOMP_H
#include <bfc/platform/types.h>
#ifdef __cplusplus
extern "C" {
#endif
typedef struct alac_file
{
unsigned char *input_buffer;
int input_buffer_bitaccumulator; /* used so we can do arbitary
bit reads */
int samplesize;
int numchannels;
int bytespersample;
/* buffers */
int32_t *predicterror_buffer_a;
int32_t *predicterror_buffer_b;
int32_t *outputsamples_buffer_a;
int32_t *outputsamples_buffer_b;
int32_t *uncompressed_bytes_buffer_a;
int32_t *uncompressed_bytes_buffer_b;
/* stuff from setinfo */
uint32_t setinfo_max_samples_per_frame; /* 0x1000 = 4096 */ /* max samples per frame? */
uint8_t setinfo_7a; /* 0x00 */
uint8_t setinfo_sample_size; /* 0x10 */ /* bits per sample */
uint8_t setinfo_rice_historymult; /* 0x28 */
uint8_t setinfo_rice_initialhistory; /* 0x0a */
uint8_t setinfo_rice_kmodifier; /* 0x0e */
uint8_t setinfo_7f; /* 0x02 */ /* channels? */
uint16_t setinfo_80; /* 0x00ff, 255 */
uint32_t setinfo_82; /* 0x000020e7, 8423 */ /* max sample size?? */
uint32_t setinfo_86; /* 0x00069fe4, 434148 */ /* bit rate (avarge)?? */
uint32_t setinfo_sample_rate; /* 0x0000ac44, 44100 */ /* samplerate? */
/* end setinfo stuff */
int32_t last_bitrate;
} alac_file;
alac_file *create_alac(int samplesize, int numchannels);
void decode_frame(alac_file *alac,
unsigned char *inbuffer,
void *outbuffer, int *outputsize);
void alac_set_info(alac_file *alac, char *inputbuffer);
void destroy_alac(alac_file *alac);
#ifdef __cplusplus
}
#endif
#endif /* __ALAC__DECOMP_H */