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Code Issues Releases Activity

Optimize EOB check in mjpeg decode_block() by adjusting the VLC symbol.

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Originally committed as revision 25548 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2010-10-21 22:44:51 +00:00
parent e4463f21ee
commit a2d4dfd493
1 changed files with 2 additions and 3 deletions
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5
libavcodec/mjpegdec.c
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@ -57,6 +57,8 @@ static int build_vlc(VLC *vlc, const uint8_t *bits_table, const uint8_t *val_tab
for(i=0; i<256; i++)
huff_sym[i]= i + 16*is_ac;
if(is_ac) huff_sym[0]= 16*256;
return init_vlc_sparse(vlc, 9, nb_codes, huff_size, 1, 1, huff_code, 2, 2, huff_sym, 2, 2, use_static);
}
@ -415,9 +417,6 @@ static int decode_block(MJpegDecodeContext *s, DCTELEM *block,
UPDATE_CACHE(re, &s->gb);
GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2)
/* EOB */
if (code == 0x10)
break;
i += ((unsigned)code) >> 4;
code &= 0xf;
if(code){