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4005e5abb8
This configuration mostly copies vp9 configuration for regular video, but is done separately to allow tune av1 svc bitrates independently of vp9. Bug: webrtc:12148 Change-Id: Icd11817ada8f9b6135ee2da57204eadb50de3954 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/195329 Reviewed-by: Philip Eliasson <philipel@webrtc.org> Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Cr-Commit-Position: refs/heads/master@{#32713}
73 lines
2.9 KiB
C++
73 lines
2.9 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/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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namespace webrtc {
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bool SetAv1SvcConfig(VideoCodec& video_codec) {
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RTC_DCHECK_EQ(video_codec.codecType, kVideoCodecAV1);
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if (video_codec.ScalabilityMode().empty()) {
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RTC_LOG(LS_INFO) << "No scalability mode set.";
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return false;
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}
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std::unique_ptr<ScalableVideoController> structure =
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CreateScalabilityStructure(video_codec.ScalabilityMode());
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if (structure == nullptr) {
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RTC_LOG(LS_INFO) << "Failed to create structure "
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<< video_codec.ScalabilityMode();
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return false;
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}
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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.targetBitrate = video_codec.startBitrate;
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spatial_layer.maxBitrate = video_codec.maxBitrate;
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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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