diff options
| author | Michael Niedermayer <michaelni@gmx.at> | 2005-05-18 08:48:11 +0000 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2005-05-18 08:48:11 +0000 |
| commit | b5da363592aae26030a61c58c973504aef424c19 (patch) | |
| tree | 545d038fa79b1f902a94b7ddd894df71ef22fa4e /libavcodec/vp3.c | |
| parent | 8aeadb903a8b0dcf69f607134a9a5b807ea43458 (diff) | |
optimizing rle decoding loops a little
Originally committed as revision 4269 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/vp3.c')
| -rw-r--r-- | libavcodec/vp3.c | 26 |
1 files changed, 10 insertions, 16 deletions
diff --git a/libavcodec/vp3.c b/libavcodec/vp3.c index e3a17817ab..4bcf107396 100644 --- a/libavcodec/vp3.c +++ b/libavcodec/vp3.c @@ -1180,12 +1180,12 @@ static int unpack_superblocks(Vp3DecodeContext *s, GetBitContext *gb) * fetched the bit will be toggled again */ bit ^= 1; while (current_superblock < s->superblock_count) { - if (current_run == 0) { + if (current_run-- == 0) { bit ^= 1; #if 1 current_run = get_vlc2(gb, - s->superblock_run_length_vlc.table, 6, 2) + 1; - if (current_run == 34) + s->superblock_run_length_vlc.table, 6, 2); + if (current_run == 33) current_run += get_bits(gb, 12); #else current_run = get_superblock_run_length(gb); @@ -1206,9 +1206,7 @@ static int unpack_superblocks(Vp3DecodeContext *s, GetBitContext *gb) decode_partial_blocks = 1; } } - s->superblock_coding[current_superblock++] = - (bit) ? SB_PARTIALLY_CODED : SB_NOT_CODED; - current_run--; + s->superblock_coding[current_superblock++] = bit; } /* unpack the list of fully coded superblocks if any of the blocks were @@ -1226,12 +1224,12 @@ static int unpack_superblocks(Vp3DecodeContext *s, GetBitContext *gb) /* skip any superblocks already marked as partially coded */ if (s->superblock_coding[current_superblock] == SB_NOT_CODED) { - if (current_run == 0) { + if (current_run-- == 0) { bit ^= 1; #if 1 current_run = get_vlc2(gb, - s->superblock_run_length_vlc.table, 6, 2) + 1; - if (current_run == 34) + s->superblock_run_length_vlc.table, 6, 2); + if (current_run == 33) current_run += get_bits(gb, 12); #else current_run = get_superblock_run_length(gb); @@ -1241,9 +1239,7 @@ static int unpack_superblocks(Vp3DecodeContext *s, GetBitContext *gb) debug_block_coding(" setting superblock %d to %s\n", current_superblock, (bit) ? "fully coded" : "not coded"); - s->superblock_coding[current_superblock] = - (bit) ? SB_FULLY_CODED : SB_NOT_CODED; - current_run--; + s->superblock_coding[current_superblock] = 2*bit; } current_superblock++; } @@ -1291,11 +1287,11 @@ static int unpack_superblocks(Vp3DecodeContext *s, GetBitContext *gb) /* fragment may or may not be coded; this is the case * that cares about the fragment coding runs */ - if (current_run == 0) { + if (current_run-- == 0) { bit ^= 1; #if 1 current_run = get_vlc2(gb, - s->fragment_run_length_vlc.table, 5, 2) + 1; + s->fragment_run_length_vlc.table, 5, 2); #else current_run = get_fragment_run_length(gb); #endif @@ -1328,8 +1324,6 @@ static int unpack_superblocks(Vp3DecodeContext *s, GetBitContext *gb) i, current_fragment); } - current_run--; - } else { /* fragments are fully coded in this superblock; actual |