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nvenc: add support for lossless encoding

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Based on a patch by Philip Langdale <philipl@overt.org>
This commit is contained in:
Anton Khirnov 2016-05-11 15:38:35 +02:00
parent 795329dd4c
commit 9427d92f40
2 changed files with 15 additions and 0 deletions
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13
libavcodec/nvenc.c
View File

@ -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;

2
libavcodec/nvenc_h264.c
View File

@ -35,6 +35,8 @@ static const AVOption options[] = {
{ "ll", "low latency", 0, AV_OPT_TYPE_CONST, { .i64 = PRESET_LOW_LATENCY_DEFAULT }, 0, 0, VE, "preset" },
{ "llhq", "low latency hq", 0, AV_OPT_TYPE_CONST, { .i64 = PRESET_LOW_LATENCY_HQ }, 0, 0, VE, "preset" },
{ "llhp", "low latency hp", 0, AV_OPT_TYPE_CONST, { .i64 = PRESET_LOW_LATENCY_HP }, 0, 0, VE, "preset" },
{ "lossless", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PRESET_LOSSLESS_DEFAULT }, 0, 0, VE, "preset" },
{ "losslesshp", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PRESET_LOSSLESS_HP }, 0, 0, VE, "preset" },
{ "profile", "Set the encoding profile", OFFSET(profile), AV_OPT_TYPE_INT, { .i64 = NV_ENC_H264_PROFILE_HIGH }, NV_ENC_H264_PROFILE_BASELINE, NV_ENC_H264_PROFILE_CONSTRAINED_HIGH, VE, "profile" },
{ "baseline", "", 0, AV_OPT_TYPE_CONST, { .i64 = NV_ENC_H264_PROFILE_BASELINE }, 0, 0, VE, "profile" },
{ "main", "", 0, AV_OPT_TYPE_CONST, { .i64 = NV_ENC_H264_PROFILE_MAIN }, 0, 0, VE, "profile" },