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avoid branch

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Originally committed as revision 6088 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2006-08-25 14:42:32 +00:00
parent 14168ddb28
commit 9bffa9e7af
1 changed files with 24 additions and 28 deletions
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52
libavcodec/mpegaudiodec.c
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@ -373,8 +373,8 @@ static int decode_init(AVCodecContext * avctx)
const HuffTable *h = &mpa_huff_tables[i];
int xsize, x, y;
unsigned int n;
uint8_t tmp_bits [256];
uint16_t tmp_codes[256];
uint8_t tmp_bits [512];
uint16_t tmp_codes[512];
memset(tmp_bits , 0, sizeof(tmp_bits ));
memset(tmp_codes, 0, sizeof(tmp_codes));
@ -385,13 +385,13 @@ static int decode_init(AVCodecContext * avctx)
j = 0;
for(x=0;x<xsize;x++) {
for(y=0;y<xsize;y++){
tmp_bits [(x << 4) | y]= h->bits [j ];
tmp_codes[(x << 4) | y]= h->codes[j++];
tmp_bits [(x << 5) | y | ((x&&y)<<4)]= h->bits [j ];
tmp_codes[(x << 5) | y | ((x&&y)<<4)]= h->codes[j++];
}
}
/* XXX: fail test */
init_vlc(&huff_vlc[i], 7, 256,
init_vlc(&huff_vlc[i], 7, 512,
tmp_bits, 1, 1, tmp_codes, 2, 2, 1);
}
for(i=0;i<2;i++) {
@ -1717,18 +1717,13 @@ static int huffman_decode(MPADecodeContext *s, GranuleDef *g,
continue;
}
x = y >> 4;
y = y & 0x0f;
exponent= exponents[s_index];
dprintf("region=%d n=%d x=%d y=%d exp=%d\n",
i, g->region_size[i] - j, x, y, exponent);
if (x) {
#if 0
if (x == 15)
x += get_bitsz(&s->gb, linbits);
v = l3_unscale(x, exponent);
#else
if(y&16){
x = y >> 5;
y = y & 0x0f;
if (x < 15){
v = expval_table[ exponent ][ x ];
// v = expval_table[ (exponent&3) ][ x ] >> FFMIN(0 - (exponent>>2), 31);
@ -1736,32 +1731,33 @@ static int huffman_decode(MPADecodeContext *s, GranuleDef *g,
x += get_bitsz(&s->gb, linbits);
v = l3_unscale(x, exponent);
}
#endif
if (get_bits1(&s->gb))
v = -v;
} else {
v = 0;
}
g->sb_hybrid[s_index++] = v;
if (y) {
#if 0
if (y == 15)
y += get_bitsz(&s->gb, linbits);
v = l3_unscale(y, exponent);
#else
g->sb_hybrid[s_index] = v;
if (y < 15){
v = expval_table[ exponent ][ y ];
}else{
y += get_bitsz(&s->gb, linbits);
v = l3_unscale(y, exponent);
}
#endif
if (get_bits1(&s->gb))
v = -v;
} else {
v = 0;
g->sb_hybrid[s_index+1] = v;
}else{
x = y >> 5;
y = y & 0x0f;
x += y;
if (x < 15){
v = expval_table[ exponent ][ x ];
}else{
x += get_bitsz(&s->gb, linbits);
v = l3_unscale(x, exponent);
}
if (get_bits1(&s->gb))
v = -v;
g->sb_hybrid[s_index+!!y] = v;
}
g->sb_hybrid[s_index++] = v;
s_index+=2;
}
}