apps/codecs/libalac/decomp.h

   1 #ifndef __ALAC__DECOMP_H
   2 #define __ALAC__DECOMP_H
   3
   4 #ifndef ICODE_ATTR_ALAC
   5 #define ICODE_ATTR_ALAC ICODE_ATTR
   6 #endif
   7
   8 /* Always output samples shifted to 28 bits + sign*/
   9 #define ALAC_OUTPUT_DEPTH 29
  10 #define SCALE16 (ALAC_OUTPUT_DEPTH - 16)
  11 #define SCALE24 (ALAC_OUTPUT_DEPTH - 24)
  12 #define ALAC_MAX_CHANNELS 2
  13 #define ALAC_BLOCKSIZE 4096  /* Number of samples per channel per block */
  14
  15 typedef struct
  16 {
  17     unsigned char *input_buffer;
  18     int input_buffer_bitaccumulator; /* used so we can do arbitary
  19                                         bit reads */
  20     int samplesize;
  21     int numchannels;
  22     int bytespersample;
  23
  24     /* stuff from setinfo */
  25     uint32_t setinfo_max_samples_per_frame; /* 0x1000 = 4096 */    /* max samples per frame? */
  26     uint8_t setinfo_7a; /* 0x00 */
  27     uint8_t setinfo_sample_size; /* 0x10 */
  28     uint8_t setinfo_rice_historymult; /* 0x28 */
  29     uint8_t setinfo_rice_initialhistory; /* 0x0a */
  30     uint8_t setinfo_rice_kmodifier; /* 0x0e */
  31     uint8_t setinfo_7f; /* 0x02 */
  32     uint16_t setinfo_80; /* 0x00ff */
  33     uint32_t setinfo_82; /* 0x000020e7 */
  34     uint32_t setinfo_86; /* 0x00069fe4 */
  35     uint32_t setinfo_8a_rate; /* 0x0000ac44 */
  36     /* end setinfo stuff */
  37 } alac_file;
  38
  39 void create_alac(int samplesize, int numchannels, alac_file* alac)
  40     ICODE_ATTR_ALAC;
  41 int alac_decode_frame(alac_file *alac,
  42                       unsigned char *inbuffer,
  43                       int32_t outputbuffer[ALAC_MAX_CHANNELS][ALAC_BLOCKSIZE],
  44                       void (*yield)(void)) ICODE_ATTR_ALAC;
  45 void alac_set_info(alac_file *alac, char *inputbuffer) ICODE_ATTR_ALAC;
  46
  47 #endif /* __ALAC__DECOMP_H */
  48