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
|
typedef signed char int8_t;
typedef short int16_t;
typedef unsigned char uint8_t;
typedef unsigned int uint32_t;
union unaligned_32 {uint32_t l;} __attribute__((packed)) __attribute__((may_alias));
static inline uint32_t NEG_USR32(uint32_t a, int8_t s){return a << (32 - s);}
typedef struct GetBitContext { const uint8_t *buffer, *buffer_end; int index;}GetBitContext;
typedef struct VLC {int16_t (*table)[2];} VLC;
static __attribute__((always_inline)) inline int get_vlc2(GetBitContext *s, int16_t (*table)[2], int bits, int max_depth) {
unsigned int re_index= (s)->index;
int re_cache= 0;
{
int n, nb_bits;
unsigned int index;
index= NEG_USR32(re_cache, bits);
n = table[index][1];
if(max_depth > 1 && n < 0){
re_cache= bswap_32((((const union unaligned_32 *) (((const uint8_t *)(s)->buffer)+(re_index>>3)))->l)) << (re_index&0x07);
}
}
}
typedef struct HYuvContext{GetBitContext gb; int decorrelate; int bitstream_bpp; uint8_t *temp[3]; VLC vlc[6];} HYuvContext;
static __attribute__((always_inline)) inline void decode_bgr_1(HYuvContext *s, int count, int decorrelate, int alpha){
int i;
int code = get_vlc2(&s->gb, s->vlc[3].table, 11, 1);
if(code != -1){
s->temp[0][4*i+0] = get_vlc2(&s->gb, s->vlc[0].table, 11, 3);
s->temp[0][4*i+1] = get_vlc2(&s->gb, s->vlc[1].table, 11, 3);
s->temp[0][4*i+2] = get_vlc2(&s->gb, s->vlc[2].table, 11, 3);
}
}
void decode_bgr_bitstream(HYuvContext *s, int count){
if(s->decorrelate){
if(s->bitstream_bpp==24) decode_bgr_1(s, count, 1, 0);
else decode_bgr_1(s, count, 1, 1);
}
}
|
