RepoMirrors
/
ffmpeg
mirror of https://git.ffmpeg.org/ffmpeg.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

nvenc: add support for lossless encoding 

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

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, static void nvenc_override_rate_control(AVCodecContext *avctx,
NV_ENC_RC_PARAMS *rc) NV_ENC_RC_PARAMS *rc)
{ {
@ -554,6 +562,8 @@ static void nvenc_setup_rate_control(AVCodecContext *avctx)
if (ctx->rc > 0) { if (ctx->rc > 0) {
nvenc_override_rate_control(avctx, rc); nvenc_override_rate_control(avctx, rc);
} else if (ctx->flags & NVENC_LOSSLESS) {
set_lossless(avctx, rc);
} else if (avctx->global_quality > 0) { } else if (avctx->global_quality > 0) {
set_constqp(avctx, rc); set_constqp(avctx, rc);
} else if (avctx->qmin >= 0 && avctx->qmax >= 0) { } 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->maxNumRefFrames = avctx->refs;
h264->idrPeriod = cc->gopLength; h264->idrPeriod = cc->gopLength;
if (ctx->flags & NVENC_LOSSLESS)
h264->qpPrimeYZeroTransformBypassFlag = 1;
if (ctx->profile) if (ctx->profile)
avctx->profile = 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" }, { "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" }, { "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" }, { "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" }, { "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" }, { "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" }, { "main", "", 0, AV_OPT_TYPE_CONST, { .i64 = NV_ENC_H264_PROFILE_MAIN }, 0, 0, VE, "profile" },