alac.h 1.5 KB

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  1. #ifndef __ALAC__DECOMP_H
  2. #define __ALAC__DECOMP_H
  3. typedef struct alac_file alac_file;
  4. alac_file *create_alac(int samplesize, int numchannels);
  5. void delete_alac(alac_file *alac);
  6. void decode_frame(alac_file *alac,
  7. unsigned char *inbuffer,
  8. void *outbuffer, int *outputsize);
  9. void alac_set_info(alac_file *alac, char *inputbuffer);
  10. void allocate_buffers(alac_file *alac);
  11. struct alac_file
  12. {
  13. unsigned char *input_buffer;
  14. int input_buffer_bitaccumulator; /* used so we can do arbitary
  15. bit reads */
  16. int samplesize;
  17. int numchannels;
  18. int bytespersample;
  19. /* buffers */
  20. int32_t *predicterror_buffer_a;
  21. int32_t *predicterror_buffer_b;
  22. int32_t *outputsamples_buffer_a;
  23. int32_t *outputsamples_buffer_b;
  24. int32_t *uncompressed_bytes_buffer_a;
  25. int32_t *uncompressed_bytes_buffer_b;
  26. /* stuff from setinfo */
  27. uint32_t setinfo_max_samples_per_frame; /* 0x1000 = 4096 */ /* max samples per frame? */
  28. uint8_t setinfo_7a; /* 0x00 */
  29. uint8_t setinfo_sample_size; /* 0x10 */
  30. uint8_t setinfo_rice_historymult; /* 0x28 */
  31. uint8_t setinfo_rice_initialhistory; /* 0x0a */
  32. uint8_t setinfo_rice_kmodifier; /* 0x0e */
  33. uint8_t setinfo_7f; /* 0x02 */
  34. uint16_t setinfo_80; /* 0x00ff */
  35. uint32_t setinfo_82; /* 0x000020e7 */ /* max sample size?? */
  36. uint32_t setinfo_86; /* 0x00069fe4 */ /* bit rate (avarge)?? */
  37. uint32_t setinfo_8a_rate; /* 0x0000ac44 */
  38. /* end setinfo stuff */
  39. };
  40. #endif /* __ALAC__DECOMP_H */