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avcodec/amfenc: Implement async_depth option

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This option, which is also available on other FFmpeg hardware encoders,
allows the user to trade throughput for reduced output latency. This is
useful for ultra low latency applications like game streaming.

Signed-off-by: Cameron Gutman <aicommander@gmail.com>
This commit is contained in:
Cameron Gutman 2024-11-06 22:14:13 -06:00 committed by Dmitrii Ovchinnikov
parent 494c961379
commit a40cbf9792
4 changed files with 8 additions and 2 deletions
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3
libavcodec/amfenc.c
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@ -274,7 +274,6 @@ static int amf_init_context(AVCodecContext *avctx)
av_unused int ret;
ctx->hwsurfaces_in_queue = 0;
ctx->hwsurfaces_in_queue_max = 16;
// configure AMF logger
// the return of these functions indicates old state and do not affect behaviour
@ -329,7 +328,7 @@ static int amf_init_context(AVCodecContext *avctx)
return AVERROR(ENOMEM);
if (frames_ctx->initial_pool_size > 0)
ctx->hwsurfaces_in_queue_max = frames_ctx->initial_pool_size - 1;
ctx->hwsurfaces_in_queue_max = FFMIN(ctx->hwsurfaces_in_queue_max, frames_ctx->initial_pool_size - 1);
} else if (avctx->hw_device_ctx) {
AVHWDeviceContext *device_ctx = (AVHWDeviceContext*)avctx->hw_device_ctx->data;

2
libavcodec/amfenc_av1.c
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@ -97,6 +97,8 @@ static const AVOption options[] = {
{ "gop", "", 0, AV_OPT_TYPE_CONST, {.i64 = AMF_VIDEO_ENCODER_AV1_HEADER_INSERTION_MODE_GOP_ALIGNED }, 0, 0, VE, .unit = "hdrmode" },
{ "frame", "", 0, AV_OPT_TYPE_CONST, {.i64 = AMF_VIDEO_ENCODER_AV1_HEADER_INSERTION_MODE_KEY_FRAME_ALIGNED }, 0, 0, VE, .unit = "hdrmode" },
{ "async_depth", "Set maximum encoding parallelism. Higher values increase output latency.", OFFSET(hwsurfaces_in_queue_max), AV_OPT_TYPE_INT, {.i64 = 16 }, 1, 16, VE },
{ "preencode", "Enable preencode", OFFSET(preencode), AV_OPT_TYPE_BOOL, {.i64 = -1 }, -1, 1, VE},
{ "enforce_hrd", "Enforce HRD", OFFSET(enforce_hrd), AV_OPT_TYPE_BOOL, {.i64 = -1 }, -1, 1, VE},
{ "filler_data", "Filler Data Enable", OFFSET(filler_data), AV_OPT_TYPE_BOOL, {.i64 = -1 }, -1, 1, VE},

3
libavcodec/amfenc_h264.c
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@ -110,6 +110,9 @@ static const AVOption options[] = {
/// Header Insertion Spacing
{ "header_spacing", "Header Insertion Spacing", OFFSET(header_spacing), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1000, VE },
/// Maximum queued frames
{ "async_depth", "Set maximum encoding parallelism. Higher values increase output latency.", OFFSET(hwsurfaces_in_queue_max), AV_OPT_TYPE_INT, {.i64 = 16 }, 1, 16, VE },
/// B-Frames
// BPicturesPattern=bf
{ "bf_delta_qp", "B-Picture Delta QP", OFFSET(b_frame_delta_qp), AV_OPT_TYPE_INT, { .i64 = 4 }, -10, 10, VE },

2
libavcodec/amfenc_hevc.c
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@ -83,6 +83,8 @@ static const AVOption options[] = {
{ "gop", "", 0, AV_OPT_TYPE_CONST, { .i64 = AMF_VIDEO_ENCODER_HEVC_HEADER_INSERTION_MODE_GOP_ALIGNED }, 0, 0, VE, .unit = "hdrmode" },
{ "idr", "", 0, AV_OPT_TYPE_CONST, { .i64 = AMF_VIDEO_ENCODER_HEVC_HEADER_INSERTION_MODE_IDR_ALIGNED }, 0, 0, VE, .unit = "hdrmode" },
{ "async_depth", "Set maximum encoding parallelism. Higher values increase output latency.", OFFSET(hwsurfaces_in_queue_max), AV_OPT_TYPE_INT, {.i64 = 16 }, 1, 16, VE },
{ "high_motion_quality_boost_enable", "Enable High motion quality boost mode", OFFSET(hw_high_motion_quality_boost), AV_OPT_TYPE_BOOL, {.i64 = -1 }, -1, 1, VE },
{ "gops_per_idr", "GOPs per IDR 0-no IDR will be inserted", OFFSET(gops_per_idr), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, INT_MAX, VE },
{ "preencode", "Enable preencode", OFFSET(preencode), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1, VE},