alac.h

#ifndef __ALAC__DECOMP_H
#define __ALAC__DECOMP_H

#include <stdint.h>

typedef struct alac_file alac_file;

alac_file *alac_create(int samplesize, int numchannels);
void alac_decode_frame(alac_file *alac, unsigned char *inbuffer, void *outbuffer, int *outputsize);
void alac_set_info(alac_file *alac, char *inputbuffer);
void alac_allocate_buffers(alac_file *alac);
void alac_free(alac_file *alac);

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 */
  uint8_t setinfo_rice_historymult;                           /* 0x28 */
  uint8_t setinfo_rice_initialhistory;                        /* 0x0a */
  uint8_t setinfo_rice_kmodifier;                             /* 0x0e */
  uint8_t setinfo_7f;                                         /* 0x02 */
  uint16_t setinfo_80;                                        /* 0x00ff */
  uint32_t setinfo_82; /* 0x000020e7 */                       /* max sample size?? */
  uint32_t setinfo_86; /* 0x00069fe4 */                       /* bit rate (avarge)?? */
  uint32_t setinfo_8a_rate;                                   /* 0x0000ac44 */
  /* end setinfo stuff */
};

#endif /* __ALAC__DECOMP_H */