diff options
author | Jason Garrett-Glaser <darkshikari@gmail.com> | 2010-08-03 14:24:28 +0400 |
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committer | Jason Garrett-Glaser <darkshikari@gmail.com> | 2010-08-03 14:24:28 +0400 |
commit | 23117d69c19e3ce844f7fee805fc2f230322d92d (patch) | |
tree | 3847f77d4cf8b4f8da67e977db0540e1f0b08e00 /libavcodec/vp8.c | |
parent | be665c7da6ab657b6b56c61aed02644c2c9edd83 (diff) |
VP8: unroll MB mode decoding tree
~50% faster MB mode decoding, plus eliminate a costly switch.
Originally committed as revision 24679 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/vp8.c')
-rw-r--r-- | libavcodec/vp8.c | 47 |
1 files changed, 23 insertions, 24 deletions
diff --git a/libavcodec/vp8.c b/libavcodec/vp8.c index aa9a69c824..af18b0d241 100644 --- a/libavcodec/vp8.c +++ b/libavcodec/vp8.c @@ -745,7 +745,6 @@ void decode_mb_mode(VP8Context *s, VP8Macroblock *mb, int mb_x, int mb_y, uint8_ } else if (vp56_rac_get_prob_branchy(c, s->prob->intra)) { VP56mv near[2], best; uint8_t cnt[4] = { 0 }; - uint8_t p[4]; // inter MB, 16.2 if (vp56_rac_get_prob_branchy(c, s->prob->last)) @@ -757,30 +756,30 @@ void decode_mb_mode(VP8Context *s, VP8Macroblock *mb, int mb_x, int mb_y, uint8_ // motion vectors, 16.3 find_near_mvs(s, mb, mb_x, mb_y, near, &best, cnt); - p[0] = vp8_mode_contexts[cnt[0]][0]; - p[1] = vp8_mode_contexts[cnt[1]][1]; - p[2] = vp8_mode_contexts[cnt[2]][2]; - p[3] = vp8_mode_contexts[cnt[3]][3]; - mb->mode = vp8_rac_get_tree(c, vp8_pred16x16_tree_mvinter, p); - switch (mb->mode) { - case VP8_MVMODE_SPLIT: - clamp_mv(s, &mb->mv, &mb->mv, mb_x, mb_y); - mb->mv = mb->bmv[decode_splitmvs(s, c, mb) - 1]; - break; - case VP8_MVMODE_ZERO: + if (vp56_rac_get_prob_branchy(c, vp8_mode_contexts[cnt[0]][0])) { + if (vp56_rac_get_prob_branchy(c, vp8_mode_contexts[cnt[1]][1])) { + if (vp56_rac_get_prob_branchy(c, vp8_mode_contexts[cnt[2]][2])) { + if (vp56_rac_get_prob_branchy(c, vp8_mode_contexts[cnt[3]][3])) { + mb->mode = VP8_MVMODE_SPLIT; + clamp_mv(s, &mb->mv, &mb->mv, mb_x, mb_y); + mb->mv = mb->bmv[decode_splitmvs(s, c, mb) - 1]; + } else { + mb->mode = VP8_MVMODE_NEW; + clamp_mv(s, &mb->mv, &mb->mv, mb_x, mb_y); + mb->mv.y += + read_mv_component(c, s->prob->mvc[0]); + mb->mv.x += + read_mv_component(c, s->prob->mvc[1]); + } + } else { + mb->mode = VP8_MVMODE_NEAR; + clamp_mv(s, &mb->mv, &near[1], mb_x, mb_y); + } + } else { + mb->mode = VP8_MVMODE_NEAREST; + clamp_mv(s, &mb->mv, &near[0], mb_x, mb_y); + } + } else { + mb->mode = VP8_MVMODE_ZERO; AV_ZERO32(&mb->mv); - break; - case VP8_MVMODE_NEAREST: - clamp_mv(s, &mb->mv, &near[0], mb_x, mb_y); - break; - case VP8_MVMODE_NEAR: - clamp_mv(s, &mb->mv, &near[1], mb_x, mb_y); - break; - case VP8_MVMODE_NEW: - clamp_mv(s, &mb->mv, &mb->mv, mb_x, mb_y); - mb->mv.y += + read_mv_component(c, s->prob->mvc[0]); - mb->mv.x += + read_mv_component(c, s->prob->mvc[1]); - break; } if (mb->mode != VP8_MVMODE_SPLIT) { mb->partitioning = VP8_SPLITMVMODE_NONE; |