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First Rockbox version of ALAC decoder - porting to work in Rockbox environment and some simple (but significant) optimisations

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7544 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Dave Chapman 2005-09-22 20:46:58 +00:00
parent 567718d837
commit debbe9747e
8 changed files with 405 additions and 197 deletions
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30
apps/codecs/libalac/decomp.h
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@ -1,12 +1,34 @@
#ifndef __ALAC__DECOMP_H
#define __ALAC__DECOMP_H
typedef struct alac_file alac_file;
typedef struct
{
unsigned char *input_buffer;
int input_buffer_bitaccumulator; /* used so we can do arbitary
bit reads */
int samplesize;
int numchannels;
int bytespersample;
alac_file *create_alac(int samplesize, int numchannels);
void decode_frame(alac_file *alac,
/* 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 */
uint32_t setinfo_86; /* 0x00069fe4 */
uint32_t setinfo_8a_rate; /* 0x0000ac44 */
/* end setinfo stuff */
} alac_file;
void create_alac(int samplesize, int numchannels, alac_file* alac);
int16_t* decode_frame(alac_file *alac,
unsigned char *inbuffer,
void *outbuffer, int *outputsize);
int *outputsize);
void alac_set_info(alac_file *alac, char *inputbuffer);
#endif /* __ALAC__DECOMP_H */