Source code
Revision control
Copy as Markdown
Other Tools
/*
* Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "modules/video_coding/codecs/vp8/include/temporal_layers_checker.h"
#include <memory>
#include "modules/video_coding/codecs/interface/common_constants.h"
#include "modules/video_coding/codecs/vp8/default_temporal_layers.h"
#include "rtc_base/logging.h"
namespace webrtc {
std::unique_ptr<TemporalLayersChecker>
TemporalLayersChecker::CreateTemporalLayersChecker(Vp8TemporalLayersType type,
int num_temporal_layers) {
switch (type) {
case Vp8TemporalLayersType::kFixedPattern:
return std::make_unique<DefaultTemporalLayersChecker>(
num_temporal_layers);
case Vp8TemporalLayersType::kBitrateDynamic:
// Conference mode temporal layering for screen content in base stream.
return std::make_unique<TemporalLayersChecker>(num_temporal_layers);
}
RTC_CHECK_NOTREACHED();
}
TemporalLayersChecker::TemporalLayersChecker(int num_temporal_layers)
: num_temporal_layers_(num_temporal_layers),
sequence_number_(0),
last_sync_sequence_number_(0),
last_tl0_sequence_number_(0) {}
bool TemporalLayersChecker::CheckAndUpdateBufferState(
BufferState* state,
bool* need_sync,
bool frame_is_keyframe,
uint8_t temporal_layer,
Vp8FrameConfig::BufferFlags flags,
uint32_t sequence_number,
uint32_t* lowest_sequence_referenced) {
if (flags & Vp8FrameConfig::BufferFlags::kReference) {
if (state->temporal_layer > 0 && !state->is_keyframe) {
*need_sync = false;
}
if (!state->is_keyframe && !frame_is_keyframe &&
state->sequence_number < *lowest_sequence_referenced) {
*lowest_sequence_referenced = state->sequence_number;
}
if (!frame_is_keyframe && !state->is_keyframe &&
state->temporal_layer > temporal_layer) {
RTC_LOG(LS_ERROR) << "Frame is referencing higher temporal layer.";
return false;
}
}
if ((flags & Vp8FrameConfig::BufferFlags::kUpdate)) {
state->temporal_layer = temporal_layer;
state->sequence_number = sequence_number;
state->is_keyframe = frame_is_keyframe;
}
if (frame_is_keyframe)
state->is_keyframe = true;
return true;
}
bool TemporalLayersChecker::CheckTemporalConfig(
bool frame_is_keyframe,
const Vp8FrameConfig& frame_config) {
if (frame_config.drop_frame ||
frame_config.packetizer_temporal_idx == kNoTemporalIdx) {
return true;
}
++sequence_number_;
if (frame_config.packetizer_temporal_idx >= num_temporal_layers_ ||
(frame_config.packetizer_temporal_idx == kNoTemporalIdx &&
num_temporal_layers_ > 1)) {
RTC_LOG(LS_ERROR) << "Incorrect temporal layer set for frame: "
<< frame_config.packetizer_temporal_idx
<< " num_temporal_layers: " << num_temporal_layers_;
return false;
}
uint32_t lowest_sequence_referenced = sequence_number_;
bool need_sync = frame_config.packetizer_temporal_idx > 0 &&
frame_config.packetizer_temporal_idx != kNoTemporalIdx;
if (!CheckAndUpdateBufferState(
&last_, &need_sync, frame_is_keyframe,
frame_config.packetizer_temporal_idx, frame_config.last_buffer_flags,
sequence_number_, &lowest_sequence_referenced)) {
RTC_LOG(LS_ERROR) << "Error in the Last buffer";
return false;
}
if (!CheckAndUpdateBufferState(&golden_, &need_sync, frame_is_keyframe,
frame_config.packetizer_temporal_idx,
frame_config.golden_buffer_flags,
sequence_number_,
&lowest_sequence_referenced)) {
RTC_LOG(LS_ERROR) << "Error in the Golden buffer";
return false;
}
if (!CheckAndUpdateBufferState(
&arf_, &need_sync, frame_is_keyframe,
frame_config.packetizer_temporal_idx, frame_config.arf_buffer_flags,
sequence_number_, &lowest_sequence_referenced)) {
RTC_LOG(LS_ERROR) << "Error in the Arf buffer";
return false;
}
if (lowest_sequence_referenced < last_sync_sequence_number_ &&
!frame_is_keyframe) {
RTC_LOG(LS_ERROR) << "Reference past the last sync frame. Referenced "
<< lowest_sequence_referenced << ", but sync was at "
<< last_sync_sequence_number_;
return false;
}
if (frame_config.packetizer_temporal_idx == 0) {
last_tl0_sequence_number_ = sequence_number_;
}
if (frame_is_keyframe) {
last_sync_sequence_number_ = sequence_number_;
}
if (need_sync) {
last_sync_sequence_number_ = last_tl0_sequence_number_;
}
// Ignore sync flag on key-frames as it really doesn't matter.
if (need_sync != frame_config.layer_sync && !frame_is_keyframe) {
RTC_LOG(LS_ERROR) << "Sync bit is set incorrectly on a frame. Expected: "
<< need_sync << " Actual: " << frame_config.layer_sync;
return false;
}
return true;
}
} // namespace webrtc