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vaapi_h264: Fix HRD bit_rate/cpb_size scaling

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There should be an extra offset of 6 on bit_rate_scale and of 4 on
cpb_size_scale which were not accounted for here.
This commit is contained in:
Mark Thompson 2016-09-13 00:25:07 +01:00
parent 7081620aca
commit 3a9662af6c
1 changed files with 4 additions and 4 deletions
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8
libavcodec/vaapi_encode_h264.c
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@ -861,14 +861,14 @@ static int vaapi_encode_h264_init_sequence_params(AVCodecContext *avctx)
// Try to scale these to a sensible range so that the
// golomb encode of the value is not overlong.
mseq->bit_rate_scale =
av_clip(av_log2(avctx->bit_rate) - 15, 0, 15);
av_clip_uintp2(av_log2(avctx->bit_rate) - 15 - 6, 4);
mseq->bit_rate_value_minus1[0] =
(avctx->bit_rate >> mseq->bit_rate_scale) - 1;
(avctx->bit_rate >> mseq->bit_rate_scale + 6) - 1;
mseq->cpb_size_scale =
av_clip(av_log2(priv->hrd_params.hrd.buffer_size) - 15, 0, 15);
av_clip_uintp2(av_log2(priv->hrd_params.hrd.buffer_size) - 15 - 4, 4);
mseq->cpb_size_value_minus1[0] =
(priv->hrd_params.hrd.buffer_size >> mseq->cpb_size_scale) - 1;
(priv->hrd_params.hrd.buffer_size >> mseq->cpb_size_scale + 4) - 1;
// CBR mode isn't actually available here, despite naming.
mseq->cbr_flag[0] = 0;