diff options
| author | Michael Niedermayer <michael@niedermayer.cc> | 2015-07-30 04:42:16 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2015-07-30 05:00:54 +0200 |
| commit | bf2474c74f2c0b956c069f50483c7d104d856d8b (patch) | |
| tree | 0e5f7d92192a97779396c430b78c847be1069850 /libavcodec/mpegvideo_enc.c | |
| parent | 9723d439fdebe7c9fd3819785173fc28509c434b (diff) | |
avcodec/mpeg12enc: extend QP range to 28 for non linear quantizers
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Diffstat (limited to 'libavcodec/mpegvideo_enc.c')
| -rw-r--r-- | libavcodec/mpegvideo_enc.c | 30 |
1 files changed, 25 insertions, 5 deletions
diff --git a/libavcodec/mpegvideo_enc.c b/libavcodec/mpegvideo_enc.c index e39114244c..c7b710172b 100644 --- a/libavcodec/mpegvideo_enc.c +++ b/libavcodec/mpegvideo_enc.c @@ -163,9 +163,29 @@ void ff_convert_matrix(MpegEncContext *s, int (*qmat)[64], static inline void update_qscale(MpegEncContext *s) { - s->qscale = (s->lambda * 139 + FF_LAMBDA_SCALE * 64) >> - (FF_LAMBDA_SHIFT + 7); - s->qscale = av_clip(s->qscale, s->avctx->qmin, s->avctx->qmax); + if (s->q_scale_type == 1) { + int i; + int bestdiff=INT_MAX; + int best = 1; + static const uint8_t non_linear_qscale[] = { + 1,2,3,4,5,6,7,8,9,10,11,12,14,16,18,20,24,26,28 + }; + + for (i = 0 ; i<FF_ARRAY_ELEMS(non_linear_qscale); i++) { + int diff = FFABS((non_linear_qscale[i]<<(FF_LAMBDA_SHIFT + 7)) - (int)s->lambda * 139); + if (non_linear_qscale[i] < s->avctx->qmin || non_linear_qscale[i] > s->avctx->qmax) + continue; + if (diff < bestdiff) { + bestdiff = diff; + best = non_linear_qscale[i]; + } + } + s->qscale = best; + } else { + s->qscale = (s->lambda * 139 + FF_LAMBDA_SCALE * 64) >> + (FF_LAMBDA_SHIFT + 7); + s->qscale = av_clip(s->qscale, s->avctx->qmin, s->avctx->qmax); + } s->lambda2 = (s->lambda * s->lambda + FF_LAMBDA_SCALE / 2) >> FF_LAMBDA_SHIFT; @@ -616,9 +636,9 @@ FF_ENABLE_DEPRECATION_WARNINGS } if (s->q_scale_type == 1) { - if (avctx->qmax > 12) { + if (avctx->qmax > 28) { av_log(avctx, AV_LOG_ERROR, - "non linear quant only supports qmax <= 12 currently\n"); + "non linear quant only supports qmax <= 28 currently\n"); return -1; } } |