1 typedef signed char int8_t;
2 typedef short int16_t;
3 typedef unsigned char uint8_t;
4 typedef unsigned int uint32_t;
5
6 union unaligned_32 {uint32_t l;} __attribute__((packed)) __attribute__((may_alias));
NEG_USR32(uint32_t a,int8_t s)7 static inline uint32_t NEG_USR32(uint32_t a, int8_t s){return a << (32 - s);}
8 typedef struct GetBitContext { const uint8_t *buffer, *buffer_end; int index;}GetBitContext;
9 typedef struct VLC {int16_t (*table)[2];} VLC;
get_vlc2(GetBitContext * s,int16_t (* table)[2],int bits,int max_depth)10 static __attribute__((always_inline)) inline int get_vlc2(GetBitContext *s, int16_t (*table)[2], int bits, int max_depth) {
11 unsigned int re_index= (s)->index;
12 int re_cache= 0;
13 {
14 int n, nb_bits;
15 unsigned int index;
16 index= NEG_USR32(re_cache, bits);
17 n = table[index][1];
18 if(max_depth > 1 && n < 0){
19 re_cache= bswap_32((((const union unaligned_32 *) (((const uint8_t *)(s)->buffer)+(re_index>>3)))->l)) << (re_index&0x07);
20 }
21 }
22 }
23 typedef struct HYuvContext{GetBitContext gb; int decorrelate; int bitstream_bpp; uint8_t *temp[3]; VLC vlc[6];} HYuvContext;
decode_bgr_1(HYuvContext * s,int count,int decorrelate,int alpha)24 static __attribute__((always_inline)) inline void decode_bgr_1(HYuvContext *s, int count, int decorrelate, int alpha){
25 int i;
26 int code = get_vlc2(&s->gb, s->vlc[3].table, 11, 1);
27 if(code != -1){
28 s->temp[0][4*i+0] = get_vlc2(&s->gb, s->vlc[0].table, 11, 3);
29 s->temp[0][4*i+1] = get_vlc2(&s->gb, s->vlc[1].table, 11, 3);
30 s->temp[0][4*i+2] = get_vlc2(&s->gb, s->vlc[2].table, 11, 3);
31 }
32 }
decode_bgr_bitstream(HYuvContext * s,int count)33 void decode_bgr_bitstream(HYuvContext *s, int count){
34 if(s->decorrelate){
35 if(s->bitstream_bpp==24) decode_bgr_1(s, count, 1, 0);
36 else decode_bgr_1(s, count, 1, 1);
37 }
38 }
39