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Add experimental simulcast screen content mode

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BUG=webrtc:4172

Review-Url: https://codereview.webrtc.org/2636443002
Cr-Commit-Position: refs/heads/master@{#16135}
This commit is contained in:
sprang
2017-01-18 00:36:31 -08:00
committed by Commit bot
parent b3dc2b7b1e
commit a28e971e3b
8 changed files with 180 additions and 77 deletions
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19
webrtc/modules/video_coding/codecs/vp8/screenshare_layers.cc
View File

@ -30,6 +30,8 @@ static const int kQpDeltaThresholdForSync = 8;
const double ScreenshareLayers::kMaxTL0FpsReduction = 2.5;
const double ScreenshareLayers::kAcceptableTargetOvershoot = 2.0;
constexpr int ScreenshareLayers::kMaxNumTemporalLayers;
// Since this is TL0 we only allow updating and predicting from the LAST
// reference frame.
const int ScreenshareLayers::kTl0Flags =
@ -55,8 +57,14 @@ webrtc::TemporalLayers* ScreenshareTemporalLayersFactory::Create(
int simulcast_id,
int num_temporal_layers,
uint8_t initial_tl0_pic_idx) const {
webrtc::TemporalLayers* tl = new webrtc::ScreenshareLayers(
num_temporal_layers, rand(), webrtc::Clock::GetRealTimeClock());
webrtc::TemporalLayers* tl;
if (simulcast_id == 0) {
tl = new webrtc::ScreenshareLayers(num_temporal_layers, rand(),
webrtc::Clock::GetRealTimeClock());
} else {
RealTimeTemporalLayersFactory rt_tl_factory;
tl = rt_tl_factory.Create(simulcast_id, num_temporal_layers, rand());
}
if (listener_)
listener_->OnTemporalLayersCreated(simulcast_id, tl);
return tl;
@ -66,7 +74,8 @@ ScreenshareLayers::ScreenshareLayers(int num_temporal_layers,
uint8_t initial_tl0_pic_idx,
Clock* clock)
: clock_(clock),
number_of_temporal_layers_(num_temporal_layers),
number_of_temporal_layers_(
std::min(kMaxNumTemporalLayers, num_temporal_layers)),
last_base_layer_sync_(false),
tl0_pic_idx_(initial_tl0_pic_idx),
active_layer_(-1),
@ -78,8 +87,8 @@ ScreenshareLayers::ScreenshareLayers(int num_temporal_layers,
max_debt_bytes_(0),
encode_framerate_(1000.0f, 1000.0f), // 1 second window, second scale.
bitrate_updated_(false) {
RTC_CHECK_GT(num_temporal_layers, 0);
RTC_CHECK_LE(num_temporal_layers, 2);
RTC_CHECK_GT(number_of_temporal_layers_, 0);
RTC_CHECK_LE(number_of_temporal_layers_, kMaxNumTemporalLayers);
}
ScreenshareLayers::~ScreenshareLayers() {

2
webrtc/modules/video_coding/codecs/vp8/screenshare_layers.h
View File

@ -84,7 +84,7 @@ class ScreenshareLayers : public TemporalLayers {
RateStatistics encode_framerate_;
bool bitrate_updated_;
static const int kMaxNumTemporalLayers = 2;
static constexpr int kMaxNumTemporalLayers = 2;
struct TemporalLayer {
TemporalLayer()
: state(State::kNormal),