blob: 068f4faf28ea067ecbec0f741cbcf91d0f9f2f25 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
|
#include "bitstream.h"
#define SHN_OUTPUT_DEPTH 29 /* 28 bits + sign */
#define MAX_CHANNELS 2
#define MAX_PRED_ORDER 16
#define MAX_NWRAP MAX_PRED_ORDER
#define MAX_NMEAN 4
/* NUM_DEC_LOOPS should be even number */
#define NUM_DEC_LOOPS 26
#define DEFAULT_BLOCK_SIZE 256
#define MAX_HEADER_SIZE DEFAULT_BLOCK_SIZE*4
#define MAX_BUFFER_SIZE 2*DEFAULT_BLOCK_SIZE*NUM_DEC_LOOPS
#define MAX_DECODE_SIZE ((DEFAULT_BLOCK_SIZE*NUM_DEC_LOOPS/2) + MAX_NWRAP)
#define MAX_OFFSET_SIZE MAX_NMEAN
#define FN_DIFF0 0
#define FN_DIFF1 1
#define FN_DIFF2 2
#define FN_DIFF3 3
#define FN_QUIT 4
#define FN_BLOCKSIZE 5
#define FN_BITSHIFT 6
#define FN_QLPC 7
#define FN_ZERO 8
#define FN_VERBATIM 9
#define FN_ERROR 10
typedef struct ShortenContext {
GetBitContext gb;
int32_t lpcqoffset;
uint32_t totalsamples;
int header_bits;
int channels;
int sample_rate;
int bits_per_sample;
int version;
int bitshift;
int last_bitshift;
int nmean;
int nwrap;
int blocksize;
int bitindex;
} ShortenContext;
int shorten_init(ShortenContext* s, uint8_t *buf, int buf_size);
int shorten_decode_frames(ShortenContext *s, int *nsamples,
int32_t *decoded0, int32_t *decoded1,
int32_t *offset0, int32_t *offset1,
uint8_t *buf, int buf_size,
void (*yield)(void)) ICODE_ATTR;
|
