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111
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1 typedef signed char int8_t;
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2 typedef short int16_t;
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3 typedef unsigned char uint8_t;
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4 typedef unsigned int uint32_t;
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5
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6 union unaligned_32 {uint32_t l;} __attribute__((packed)) __attribute__((may_alias));
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7 static inline uint32_t NEG_USR32(uint32_t a, int8_t s){return a << (32 - s);}
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8 typedef struct GetBitContext { const uint8_t *buffer, *buffer_end; int index;}GetBitContext;
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9 typedef struct VLC {int16_t (*table)[2];} VLC;
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10 static __attribute__((always_inline)) inline int get_vlc2(GetBitContext *s, int16_t (*table)[2], int bits, int max_depth) {
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11 unsigned int re_index= (s)->index;
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12 int re_cache= 0;
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13 {
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14 int n, nb_bits;
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15 unsigned int index;
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16 index= NEG_USR32(re_cache, bits);
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17 n = table[index][1];
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18 if(max_depth > 1 && n < 0){
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19 re_cache= bswap_32((((const union unaligned_32 *) (((const uint8_t *)(s)->buffer)+(re_index>>3)))->l)) << (re_index&0x07);
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20 }
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21 }
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22 }
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23 typedef struct HYuvContext{GetBitContext gb; int decorrelate; int bitstream_bpp; uint8_t *temp[3]; VLC vlc[6];} HYuvContext;
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24 static __attribute__((always_inline)) inline void decode_bgr_1(HYuvContext *s, int count, int decorrelate, int alpha){
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25 int i;
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26 int code = get_vlc2(&s->gb, s->vlc[3].table, 11, 1);
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27 if(code != -1){
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28 s->temp[0][4*i+0] = get_vlc2(&s->gb, s->vlc[0].table, 11, 3);
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29 s->temp[0][4*i+1] = get_vlc2(&s->gb, s->vlc[1].table, 11, 3);
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30 s->temp[0][4*i+2] = get_vlc2(&s->gb, s->vlc[2].table, 11, 3);
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31 }
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32 }
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33 void decode_bgr_bitstream(HYuvContext *s, int count){
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34 if(s->decorrelate){
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35 if(s->bitstream_bpp==24) decode_bgr_1(s, count, 1, 0);
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36 else decode_bgr_1(s, count, 1, 1);
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37 }
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38 }
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