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