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/*
* Copyright (c) 2020 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/av1/av1_svc_config.h"
#include <algorithm>
#include <cmath>
#include <memory>
#include "modules/video_coding/svc/create_scalability_structure.h"
#include "modules/video_coding/svc/scalable_video_controller.h"
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"
namespace webrtc {
bool SetAv1SvcConfig(VideoCodec& video_codec) {
RTC_DCHECK_EQ(video_codec.codecType, kVideoCodecAV1);
if (video_codec.ScalabilityMode().empty()) {
RTC_LOG(LS_INFO) << "No scalability mode set.";
return false;
}
std::unique_ptr<ScalableVideoController> structure =
CreateScalabilityStructure(video_codec.ScalabilityMode());
if (structure == nullptr) {
RTC_LOG(LS_INFO) << "Failed to create structure "
<< video_codec.ScalabilityMode();
return false;
}
ScalableVideoController::StreamLayersConfig info = structure->StreamConfig();
for (int sl_idx = 0; sl_idx < info.num_spatial_layers; ++sl_idx) {
SpatialLayer& spatial_layer = video_codec.spatialLayers[sl_idx];
spatial_layer.width = video_codec.width * info.scaling_factor_num[sl_idx] /
info.scaling_factor_den[sl_idx];
spatial_layer.height = video_codec.height *
info.scaling_factor_num[sl_idx] /
info.scaling_factor_den[sl_idx];
spatial_layer.maxFramerate = video_codec.maxFramerate;
spatial_layer.numberOfTemporalLayers = info.num_temporal_layers;
spatial_layer.active = true;
}
if (info.num_spatial_layers == 1) {
SpatialLayer& spatial_layer = video_codec.spatialLayers[0];
spatial_layer.minBitrate = video_codec.minBitrate;
spatial_layer.targetBitrate = video_codec.startBitrate;
spatial_layer.maxBitrate = video_codec.maxBitrate;
return true;
}
for (int sl_idx = 0; sl_idx < info.num_spatial_layers; ++sl_idx) {
SpatialLayer& spatial_layer = video_codec.spatialLayers[sl_idx];
// minBitrate and maxBitrate formulas are copied from vp9 settings and
// are not yet tuned for av1.
const int num_pixels = spatial_layer.width * spatial_layer.height;
int min_bitrate_kbps = (600.0 * std::sqrt(num_pixels) - 95'000.0) / 1000.0;
spatial_layer.minBitrate = std::max(min_bitrate_kbps, 20);
spatial_layer.maxBitrate = 50 + static_cast<int>(1.6 * num_pixels / 1000.0);
spatial_layer.targetBitrate =
(spatial_layer.minBitrate + spatial_layer.maxBitrate) / 2;
}
return true;
}
} // namespace webrtc
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