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| author | Mike Melanson <mike@multimedia.cx> | 2005-05-18 00:11:49 +0000 |
|---|---|---|
| committer | Mike Melanson <mike@multimedia.cx> | 2005-05-18 00:11:49 +0000 |
| commit | d8278bab79ffc82f449522766fbd505dd64b6c1c (patch) | |
| tree | 46776cd86fa0e1178cad1d6b1cde5871e1a932c0 | |
| parent | 0ad72bdd5cb493df78c660b9859a8b890018926a (diff) | |
| download | ffmpeg-d8278bab79ffc82f449522766fbd505dd64b6c1c.tar.gz | |
replace get_superblock_run_length() with a VLC table
Originally committed as revision 4267 to svn://svn.ffmpeg.org/ffmpeg/trunk
| -rw-r--r-- | libavcodec/vp3.c | 18 | ||||
| -rw-r--r-- | libavcodec/vp3data.h | 21 |
2 files changed, 39 insertions, 0 deletions
diff --git a/libavcodec/vp3.c b/libavcodec/vp3.c index ad72965e4c..9e9939abb9 100644 --- a/libavcodec/vp3.c +++ b/libavcodec/vp3.c @@ -1182,7 +1182,14 @@ static int unpack_superblocks(Vp3DecodeContext *s, GetBitContext *gb) while (current_superblock < s->superblock_count) { 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) + current_run += get_bits(gb, 12); +#else current_run = get_superblock_run_length(gb); +#endif debug_block_coding(" setting superblocks %d..%d to %s\n", current_superblock, current_superblock + current_run - 1, @@ -1221,7 +1228,14 @@ static int unpack_superblocks(Vp3DecodeContext *s, GetBitContext *gb) 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) + current_run += get_bits(gb, 12); +#else current_run = get_superblock_run_length(gb); +#endif } debug_block_coding(" setting superblock %d to %s\n", @@ -2630,6 +2644,10 @@ static int vp3_decode_init(AVCodecContext *avctx) &ac_bias_3[i][0][0], 4, 2, 0); } + init_vlc(&s->superblock_run_length_vlc, 6, 34, + &superblock_run_length_vlc_table[0][1], 4, 2, + &superblock_run_length_vlc_table[0][0], 4, 2, 0); + init_vlc(&s->fragment_run_length_vlc, 5, 31, &fragment_run_length_vlc_table[0][1], 4, 2, &fragment_run_length_vlc_table[0][0], 4, 2, 0); diff --git a/libavcodec/vp3data.h b/libavcodec/vp3data.h index 5a5ff9cac5..893a5873a0 100644 --- a/libavcodec/vp3data.h +++ b/libavcodec/vp3data.h @@ -72,6 +72,27 @@ static const uint32_t vp31_filter_limit_values[64] = 0, 0, 0, 0, 0, 0, 0, 0 }; +static const uint16_t superblock_run_length_vlc_table[34][2] = { + { 0, 1 }, + + { 4, 3 }, { 5, 3 }, + + { 0xC, 4 }, { 0xD, 4 }, + + { 0x38, 6 }, { 0x39, 6 }, { 0x3A, 6 }, { 0x3B, 6 }, + + { 0xF0, 8 }, { 0xF1, 8 }, { 0xF2, 8 }, { 0xF3, 8 }, + { 0xF4, 8 }, { 0xF5, 8 }, { 0xF6, 8 }, { 0xF7, 8 }, + + { 0x3E0, 10 }, { 0x3E1, 10 }, { 0x3E2, 10 }, { 0x3E3, 10 }, + { 0x3E4, 10 }, { 0x3E5, 10 }, { 0x3E6, 10 }, { 0x3E7, 10 }, + { 0x3E8, 10 }, { 0x3E9, 10 }, { 0x3EA, 10 }, { 0x3EB, 10 }, + { 0x3EC, 10 }, { 0x3ED, 10 }, { 0x3EE, 10 }, { 0x3EF, 10 }, + + { 0x3F, 6 } /* this last VLC is a special case for reading 12 more + bits from stream and adding the value 34 */ +}; + static const uint16_t fragment_run_length_vlc_table[30][2] = { /* 1 -> 2 */ { 0x0, 2 }, { 0x1, 2 }, |