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https://git.videolan.org/git/ffmpeg.git
synced 2024-08-18 07:15:04 +02:00
optimizing rle decoding loops a little
Originally committed as revision 4269 to svn://svn.ffmpeg.org/ffmpeg/trunk
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parent
8aeadb903a
commit
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@ -1180,12 +1180,12 @@ static int unpack_superblocks(Vp3DecodeContext *s, GetBitContext *gb)
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* fetched the bit will be toggled again */
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bit ^= 1;
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while (current_superblock < s->superblock_count) {
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if (current_run == 0) {
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if (current_run-- == 0) {
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bit ^= 1;
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#if 1
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current_run = get_vlc2(gb,
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s->superblock_run_length_vlc.table, 6, 2) + 1;
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if (current_run == 34)
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s->superblock_run_length_vlc.table, 6, 2);
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if (current_run == 33)
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current_run += get_bits(gb, 12);
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#else
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current_run = get_superblock_run_length(gb);
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@ -1206,9 +1206,7 @@ static int unpack_superblocks(Vp3DecodeContext *s, GetBitContext *gb)
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decode_partial_blocks = 1;
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}
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}
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s->superblock_coding[current_superblock++] =
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(bit) ? SB_PARTIALLY_CODED : SB_NOT_CODED;
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current_run--;
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s->superblock_coding[current_superblock++] = bit;
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}
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/* unpack the list of fully coded superblocks if any of the blocks were
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@ -1226,12 +1224,12 @@ static int unpack_superblocks(Vp3DecodeContext *s, GetBitContext *gb)
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/* skip any superblocks already marked as partially coded */
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if (s->superblock_coding[current_superblock] == SB_NOT_CODED) {
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if (current_run == 0) {
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if (current_run-- == 0) {
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bit ^= 1;
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#if 1
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current_run = get_vlc2(gb,
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s->superblock_run_length_vlc.table, 6, 2) + 1;
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if (current_run == 34)
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s->superblock_run_length_vlc.table, 6, 2);
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if (current_run == 33)
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current_run += get_bits(gb, 12);
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#else
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current_run = get_superblock_run_length(gb);
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@ -1241,9 +1239,7 @@ static int unpack_superblocks(Vp3DecodeContext *s, GetBitContext *gb)
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debug_block_coding(" setting superblock %d to %s\n",
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current_superblock,
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(bit) ? "fully coded" : "not coded");
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s->superblock_coding[current_superblock] =
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(bit) ? SB_FULLY_CODED : SB_NOT_CODED;
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current_run--;
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s->superblock_coding[current_superblock] = 2*bit;
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}
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current_superblock++;
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}
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@ -1291,11 +1287,11 @@ static int unpack_superblocks(Vp3DecodeContext *s, GetBitContext *gb)
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/* fragment may or may not be coded; this is the case
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* that cares about the fragment coding runs */
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if (current_run == 0) {
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if (current_run-- == 0) {
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bit ^= 1;
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#if 1
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current_run = get_vlc2(gb,
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s->fragment_run_length_vlc.table, 5, 2) + 1;
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s->fragment_run_length_vlc.table, 5, 2);
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#else
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current_run = get_fragment_run_length(gb);
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#endif
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@ -1328,8 +1324,6 @@ static int unpack_superblocks(Vp3DecodeContext *s, GetBitContext *gb)
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i, current_fragment);
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}
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current_run--;
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} else {
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/* fragments are fully coded in this superblock; actual
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