zqz/platform-external-webrtc
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Correctly set number of reference buffers in H264 encoder

Browse Source 
iNumRefFrame specifies total number of reference buffers to allocate.
For N temporal layers we need at least (N - 1) buffers to store last
encoded frames of all reference temporal layers.

There is no API in OpenH254 encoder to specify exact set of references
to be used to prediction of a given frame. Encoder can theoretically
use all available references.

Note that there is logic in OpenH264 which overrides iNumRefFrame to
max(iNumRefFrame, N - 1): https://source.chromium.org/chromium/chromium/src/+/main:third_party/openh264/src/codec/encoder/core/src/au_set.cpp;drc=8e90a2775c5b9448324fe8fef11d177cb65f36cc;l=122.
I.e., this change has no real effect. It only makes setup more clear.

Bug: none
Change-Id: If4b4970007e1cc55d8f052ea05213ab2e89a878f
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/225480
Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
Reviewed-by: Erik Språng <sprang@webrtc.org>
Commit-Queue: Sergey Silkin <ssilkin@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34445}
This commit is contained in:
Sergey Silkin
2021-07-09 13:45:29 +02:00
committed by WebRTC LUCI CQ
parent e91c992fa1
commit d6afbead2d
3 changed files with 17 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
modules/video_coding/codecs/test/videocodec_test_fixture_impl.cc
View File

@ -128,6 +128,8 @@ std::string CodecSpecificToString(const VideoCodec& codec) {
case kVideoCodecH264:
ss << "frame_dropping: " << codec.H264().frameDroppingOn;
ss << "\nkey_frame_interval: " << codec.H264().keyFrameInterval;
ss << "\nnum_temporal_layers: "
<< static_cast<int>(codec.H264().numberOfTemporalLayers);
break;
default:
break;
@ -214,6 +216,8 @@ void VideoCodecTestFixtureImpl::Config::SetCodecSettings(
case kVideoCodecH264:
codec_settings.H264()->frameDroppingOn = frame_dropper_on;
codec_settings.H264()->keyFrameInterval = kBaseKeyFrameInterval;
codec_settings.H264()->numberOfTemporalLayers =
static_cast<uint8_t>(num_temporal_layers);
break;
default:
break;
@ -236,6 +240,8 @@ size_t VideoCodecTestFixtureImpl::Config::NumberOfTemporalLayers() const {
return codec_settings.VP8().numberOfTemporalLayers;
} else if (codec_settings.codecType == kVideoCodecVP9) {
return codec_settings.VP9().numberOfTemporalLayers;
} else if (codec_settings.codecType == kVideoCodecH264) {
return codec_settings.H264().numberOfTemporalLayers;
} else {
return 1;
}