diff options
Diffstat (limited to 'vp9')
| -rw-r--r-- | vp9/encoder/vp9_aq_complexity.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/vp9/encoder/vp9_aq_complexity.c b/vp9/encoder/vp9_aq_complexity.c index 47ad8d8cc..0d6b41d15 100644 --- a/vp9/encoder/vp9_aq_complexity.c +++ b/vp9/encoder/vp9_aq_complexity.c @@ -47,11 +47,21 @@ void vp9_setup_in_frame_q_adj(VP9_COMP *cpi) { // Use some of the segments for in frame Q adjustment. for (segment = 1; segment < 2; segment++) { - const int qindex_delta = + int qindex_delta = vp9_compute_qdelta_by_rate(&cpi->rc, cm->frame_type, cm->base_qindex, in_frame_q_adj_ratio[segment]); - vp9_enable_segfeature(seg, segment, SEG_LVL_ALT_Q); - vp9_set_segdata(seg, segment, SEG_LVL_ALT_Q, qindex_delta); + + // For AQ mode 2, we dont allow Q0 in a segment if the base Q is not 0. + // Q0 (lossless) implies 4x4 only and in AQ mode 2 a segment Q delta + // is sometimes applied without going back around the rd loop. + // This could lead to an illegal combination of partition size and q. + if ((cm->base_qindex != 0) && ((cm->base_qindex + qindex_delta) == 0)) { + qindex_delta = -cm->base_qindex + 1; + } + if ((cm->base_qindex + qindex_delta) > 0) { + vp9_enable_segfeature(seg, segment, SEG_LVL_ALT_Q); + vp9_set_segdata(seg, segment, SEG_LVL_ALT_Q, qindex_delta); + } } } } |