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a1a7c638ec
Also move ScalabilityModeToString to api and add RTC_EXPORT so that Chromium can use it. Bug: chromium:986069 Change-Id: I5dbbb6de9b14ca20f3ae0630552dcd44595ad5ef Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/267780 Reviewed-by: Harald Alvestrand <hta@webrtc.org> Commit-Queue: Daniel.L (Byoungchan) Lee <daniel.l@hpcnt.com> Cr-Commit-Position: refs/heads/main@{#37444}
118 lines
4.5 KiB
C++
118 lines
4.5 KiB
C++
/*
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* Copyright (c) 2020 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "modules/video_coding/codecs/av1/av1_svc_config.h"
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#include <algorithm>
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#include <cmath>
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#include <memory>
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#include "modules/video_coding/svc/create_scalability_structure.h"
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#include "modules/video_coding/svc/scalability_mode_util.h"
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#include "modules/video_coding/svc/scalable_video_controller.h"
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#include "rtc_base/checks.h"
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#include "rtc_base/logging.h"
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#include "rtc_base/strings/string_builder.h"
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namespace webrtc {
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namespace {
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absl::optional<ScalabilityMode> BuildScalabilityMode(int num_temporal_layers,
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int num_spatial_layers) {
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char name[20];
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rtc::SimpleStringBuilder ss(name);
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ss << "L" << num_spatial_layers << "T" << num_temporal_layers;
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if (num_spatial_layers > 1) {
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ss << "_KEY";
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}
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return ScalabilityModeFromString(name);
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}
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} // namespace
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absl::InlinedVector<ScalabilityMode, kScalabilityModeCount>
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LibaomAv1EncoderSupportedScalabilityModes() {
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absl::InlinedVector<ScalabilityMode, kScalabilityModeCount> scalability_modes;
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for (ScalabilityMode scalability_mode : kAllScalabilityModes) {
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if (ScalabilityStructureConfig(scalability_mode) != absl::nullopt) {
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scalability_modes.push_back(scalability_mode);
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}
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}
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return scalability_modes;
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}
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bool LibaomAv1EncoderSupportsScalabilityMode(ScalabilityMode scalability_mode) {
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// For libaom AV1, the scalability mode is supported if we can create the
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// scalability structure.
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return ScalabilityStructureConfig(scalability_mode) != absl::nullopt;
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}
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bool SetAv1SvcConfig(VideoCodec& video_codec,
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int num_temporal_layers,
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int num_spatial_layers) {
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RTC_DCHECK_EQ(video_codec.codecType, kVideoCodecAV1);
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absl::optional<ScalabilityMode> scalability_mode =
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video_codec.GetScalabilityMode();
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if (!scalability_mode.has_value()) {
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scalability_mode =
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BuildScalabilityMode(num_temporal_layers, num_spatial_layers);
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if (!scalability_mode) {
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RTC_LOG(LS_WARNING) << "Scalability mode is not set, using 'L1T1'.";
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scalability_mode = ScalabilityMode::kL1T1;
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}
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}
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std::unique_ptr<ScalableVideoController> structure =
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CreateScalabilityStructure(*scalability_mode);
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if (structure == nullptr) {
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RTC_LOG(LS_WARNING) << "Failed to create structure "
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<< static_cast<int>(*scalability_mode);
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return false;
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}
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video_codec.SetScalabilityMode(*scalability_mode);
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ScalableVideoController::StreamLayersConfig info = structure->StreamConfig();
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for (int sl_idx = 0; sl_idx < info.num_spatial_layers; ++sl_idx) {
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SpatialLayer& spatial_layer = video_codec.spatialLayers[sl_idx];
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spatial_layer.width = video_codec.width * info.scaling_factor_num[sl_idx] /
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info.scaling_factor_den[sl_idx];
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spatial_layer.height = video_codec.height *
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info.scaling_factor_num[sl_idx] /
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info.scaling_factor_den[sl_idx];
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spatial_layer.maxFramerate = video_codec.maxFramerate;
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spatial_layer.numberOfTemporalLayers = info.num_temporal_layers;
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spatial_layer.active = true;
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}
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if (info.num_spatial_layers == 1) {
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SpatialLayer& spatial_layer = video_codec.spatialLayers[0];
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spatial_layer.minBitrate = video_codec.minBitrate;
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spatial_layer.maxBitrate = video_codec.maxBitrate;
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spatial_layer.targetBitrate =
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(video_codec.minBitrate + video_codec.maxBitrate) / 2;
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return true;
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}
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for (int sl_idx = 0; sl_idx < info.num_spatial_layers; ++sl_idx) {
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SpatialLayer& spatial_layer = video_codec.spatialLayers[sl_idx];
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// minBitrate and maxBitrate formulas are copied from vp9 settings and
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// are not yet tuned for av1.
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const int num_pixels = spatial_layer.width * spatial_layer.height;
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int min_bitrate_kbps = (600.0 * std::sqrt(num_pixels) - 95'000.0) / 1000.0;
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spatial_layer.minBitrate = std::max(min_bitrate_kbps, 20);
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spatial_layer.maxBitrate = 50 + static_cast<int>(1.6 * num_pixels / 1000.0);
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spatial_layer.targetBitrate =
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(spatial_layer.minBitrate + spatial_layer.maxBitrate) / 2;
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}
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return true;
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}
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} // namespace webrtc
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