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In screenshare mode, suppress VP8 bitrate overshoot and increase quality

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This change includes several improvements:

* VP8 configured with new rate control
* Detection of frame dropping, with qp bump for next frame
* Increased target and TL0 bitrates
* Reworked rate control (TL allocation) in screenshare_layers

A note on performance: PSNR and SSIM is expected to get slightly worse with this cl. Frame drops and delays should however improve.

BUG=4171
R=pbos@webrtc.org, stefan@webrtc.org

Review URL: https://codereview.webrtc.org/1193513006.

Cr-Commit-Position: refs/heads/master@{#9495}
This commit is contained in:
Erik Språng
2015-06-24 11:24:44 +02:00
parent 7ab5f801dd
commit 2c4c914819
16 changed files with 610 additions and 294 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
webrtc/modules/video_coding/main/source/generic_encoder.cc
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@ -60,7 +60,8 @@ VCMGenericEncoder::VCMGenericEncoder(VideoEncoder* encoder,
bit_rate_(0),
frame_rate_(0),
internal_source_(internalSource),
rotation_(kVideoRotation_0) {
rotation_(kVideoRotation_0),
is_screenshare_(false) {
}
VCMGenericEncoder::~VCMGenericEncoder()
@ -90,6 +91,7 @@ VCMGenericEncoder::InitEncode(const VideoCodec* settings,
frame_rate_ = settings->maxFramerate;
}
is_screenshare_ = settings->mode == VideoCodecMode::kScreensharing;
if (encoder_->InitEncode(settings, numberOfCores, maxPayloadSize) != 0) {
LOG(LS_ERROR) << "Failed to initialize the encoder associated with "
"payload name: " << settings->plName;
@ -114,7 +116,15 @@ int32_t VCMGenericEncoder::Encode(const VideoFrame& inputFrame,
vcm_encoded_frame_callback_->SetRotation(rotation_);
}
return encoder_->Encode(inputFrame, codecSpecificInfo, &video_frame_types);
int32_t result =
encoder_->Encode(inputFrame, codecSpecificInfo, &video_frame_types);
if (is_screenshare_ &&
result == WEBRTC_VIDEO_CODEC_TARGET_BITRATE_OVERSHOOT) {
// Target bitrate exceeded, encoder state has been reset - try again.
return encoder_->Encode(inputFrame, codecSpecificInfo, &video_frame_types);
}
return result;
}
int32_t