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Selectable number of TL screenshare loopback test. Also contains some tweaks to make a single TL perform better.

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BUG=

Review URL: https://codereview.webrtc.org/1242043002

Cr-Commit-Position: refs/heads/master@{#9676}
This commit is contained in:
sprang
2015-08-05 02:01:29 -07:00
committed by Commit bot
parent 907dcfd0e1
commit ef7228cfa0
3 changed files with 36 additions and 16 deletions
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11
webrtc/modules/video_coding/codecs/vp8/screenshare_layers.cc
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@ -132,14 +132,18 @@ bool ScreenshareLayers::ConfigureBitrates(int bitrate_kbps,
int target_bitrate_kbps = bitrate_kbps;
if (cfg != nullptr) {
if (number_of_temporal_layers_ > 1) {
// Calculate a codec target bitrate. This may be higher than TL0, gaining
// quality at the expense of frame rate at TL0. Constraints:
// - TL0 frame rate should not be less than framerate / kMaxTL0FpsReduction.
// - TL0 frame rate no less than framerate / kMaxTL0FpsReduction.
// - Target rate * kAcceptableTargetOvershoot should not exceed TL1 rate.
target_bitrate_kbps =
std::min(bitrate_kbps * kMaxTL0FpsReduction,
max_bitrate_kbps / kAcceptableTargetOvershoot);
cfg->rc_target_bitrate = std::max(bitrate_kbps, target_bitrate_kbps);
}
// Don't reconfigure qp limits during quality boost frames.
if (layers_[active_layer_].state != TemporalLayer::State::kQualityBoost) {
min_qp_ = cfg->rc_min_quantizer;
@ -152,8 +156,6 @@ bool ScreenshareLayers::ConfigureBitrates(int bitrate_kbps,
layers_[0].enhanced_max_qp = min_qp_ + (((max_qp_ - min_qp_) * 80) / 100);
layers_[1].enhanced_max_qp = min_qp_ + (((max_qp_ - min_qp_) * 85) / 100);
}
cfg->rc_target_bitrate = std::max(bitrate_kbps, target_bitrate_kbps);
}
int avg_frame_size = (target_bitrate_kbps * 1000) / (8 * framerate);
@ -169,6 +171,7 @@ void ScreenshareLayers::FrameEncoded(unsigned int size,
layers_[active_layer_].state = TemporalLayer::State::kDropped;
return;
}
if (layers_[active_layer_].state == TemporalLayer::State::kDropped) {
layers_[active_layer_].state = TemporalLayer::State::kQualityBoost;
}
@ -241,7 +244,7 @@ bool ScreenshareLayers::TimeToSync(int64_t timestamp) const {
}
bool ScreenshareLayers::UpdateConfiguration(vpx_codec_enc_cfg_t* cfg) {
if (max_qp_ == -1)
if (max_qp_ == -1 || number_of_temporal_layers_ <= 1)
return false;
// If layer is in the quality boost state (following a dropped frame), update

5
webrtc/modules/video_coding/codecs/vp8/screenshare_layers_unittest.cc
View File

@ -112,15 +112,16 @@ TEST_F(ScreenshareLayerTest, 1Layer) {
CodecSpecificInfoVP8 vp8_info;
// One layer screenshare should not use the frame dropper as all frames will
// belong to the base layer.
const int kSingleLayerFlags = 0;
flags = layers_->EncodeFlags(timestamp);
EXPECT_EQ(0, flags);
EXPECT_EQ(kSingleLayerFlags, flags);
layers_->PopulateCodecSpecific(false, &vp8_info, timestamp);
EXPECT_EQ(static_cast<uint8_t>(kNoTemporalIdx), vp8_info.temporalIdx);
EXPECT_FALSE(vp8_info.layerSync);
EXPECT_EQ(kNoTl0PicIdx, vp8_info.tl0PicIdx);
layers_->FrameEncoded(frame_size_, timestamp, kDefaultQp);
flags = layers_->EncodeFlags(timestamp);
EXPECT_EQ(0, flags);
EXPECT_EQ(kSingleLayerFlags, flags);
timestamp += kTimestampDelta5Fps;
layers_->PopulateCodecSpecific(false, &vp8_info, timestamp);
EXPECT_EQ(static_cast<uint8_t>(kNoTemporalIdx), vp8_info.temporalIdx);

24
webrtc/video/screenshare_loopback.cc
View File

@ -73,6 +73,11 @@ size_t MaxBitrate() {
return static_cast<size_t>(FLAGS_tl1_bitrate);
}
DEFINE_int32(num_temporal_layers, 2, "Number of temporal layers to use.");
int NumTemporalLayers() {
return static_cast<int>(FLAGS_num_temporal_layers);
}
DEFINE_int32(min_transmit_bitrate, 400, "Min transmit bitrate incl. padding.");
int MinTransmitBitrate() {
return FLAGS_min_transmit_bitrate;
@ -128,15 +133,20 @@ DEFINE_string(
class ScreenshareLoopback : public test::Loopback {
public:
explicit ScreenshareLoopback(const Config& config) : Loopback(config) {
CHECK_GE(config.num_temporal_layers, 1u);
CHECK_LE(config.num_temporal_layers, 2u);
vp8_settings_ = VideoEncoder::GetDefaultVp8Settings();
vp8_settings_.denoisingOn = false;
vp8_settings_.frameDroppingOn = false;
vp8_settings_.numberOfTemporalLayers = 2;
vp8_settings_.numberOfTemporalLayers =
static_cast<unsigned char>(config.num_temporal_layers);
vp9_settings_ = VideoEncoder::GetDefaultVp9Settings();
vp9_settings_.denoisingOn = false;
vp9_settings_.frameDroppingOn = false;
vp9_settings_.numberOfTemporalLayers = 2;
vp9_settings_.numberOfTemporalLayers =
static_cast<unsigned char>(config.num_temporal_layers);
}
virtual ~ScreenshareLoopback() {}
@ -146,10 +156,13 @@ class ScreenshareLoopback : public test::Loopback {
VideoStream* stream = &encoder_config.streams[0];
encoder_config.content_type = VideoEncoderConfig::ContentType::kScreen;
encoder_config.min_transmit_bitrate_bps = flags::MinTransmitBitrate();
int num_temporal_layers;
if (config_.codec == "VP8") {
encoder_config.encoder_specific_settings = &vp8_settings_;
num_temporal_layers = vp8_settings_.numberOfTemporalLayers;
} else if (config_.codec == "VP9") {
encoder_config.encoder_specific_settings = &vp9_settings_;
num_temporal_layers = vp9_settings_.numberOfTemporalLayers;
} else {
RTC_NOTREACHED() << "Codec not supported!";
abort();
@ -157,7 +170,10 @@ class ScreenshareLoopback : public test::Loopback {
stream->temporal_layer_thresholds_bps.clear();
stream->target_bitrate_bps =
static_cast<int>(config_.start_bitrate_kbps) * 1000;
stream->temporal_layer_thresholds_bps.push_back(stream->target_bitrate_bps);
if (num_temporal_layers == 2) {
stream->temporal_layer_thresholds_bps.push_back(
stream->target_bitrate_bps);
}
return encoder_config;
}
@ -202,7 +218,7 @@ void Loopback() {
flags::MaxBitrate(),
flags::MinTransmitBitrate(),
flags::Codec(),
0, // Default number of temporal layers.
flags::NumTemporalLayers(),
flags::LossPercent(),
flags::LinkCapacity(),
flags::QueueSize(),