diff options
| author | Anton Khirnov <anton@khirnov.net> | 2016-05-11 15:38:35 +0200 |
|---|---|---|
| committer | Anton Khirnov <anton@khirnov.net> | 2016-05-19 14:08:55 +0200 |
| commit | 9427d92f40d4ab981f0b24e8e1d1cdec1d845ac1 (patch) | |
| tree | 7907f072adfa223d057e2cdadb4b532c602cf9e5 /libavcodec/nvenc.c | |
| parent | 795329dd4c5d100bb7c633b1a5d3145090a7a420 (diff) | |
nvenc: add support for lossless encoding
Based on a patch by Philip Langdale <philipl@overt.org>
Diffstat (limited to 'libavcodec/nvenc.c')
| -rw-r--r-- | libavcodec/nvenc.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/libavcodec/nvenc.c b/libavcodec/nvenc.c index 943cfbefba..97922453f7 100644 --- a/libavcodec/nvenc.c +++ b/libavcodec/nvenc.c @@ -494,6 +494,14 @@ static void set_vbr(AVCodecContext *avctx, NV_ENC_RC_PARAMS *rc) } } +static void set_lossless(AVCodecContext *avctx, NV_ENC_RC_PARAMS *rc) +{ + rc->rateControlMode = NV_ENC_PARAMS_RC_CONSTQP; + rc->constQP.qpInterB = 0; + rc->constQP.qpInterP = 0; + rc->constQP.qpIntra = 0; +} + static void nvenc_override_rate_control(AVCodecContext *avctx, NV_ENC_RC_PARAMS *rc) { @@ -554,6 +562,8 @@ static void nvenc_setup_rate_control(AVCodecContext *avctx) if (ctx->rc > 0) { nvenc_override_rate_control(avctx, rc); + } else if (ctx->flags & NVENC_LOSSLESS) { + set_lossless(avctx, rc); } else if (avctx->global_quality > 0) { set_constqp(avctx, rc); } else if (avctx->qmin >= 0 && avctx->qmax >= 0) { @@ -591,6 +601,9 @@ static int nvenc_setup_h264_config(AVCodecContext *avctx) h264->maxNumRefFrames = avctx->refs; h264->idrPeriod = cc->gopLength; + if (ctx->flags & NVENC_LOSSLESS) + h264->qpPrimeYZeroTransformBypassFlag = 1; + if (ctx->profile) avctx->profile = ctx->profile; |