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media / gpu / windows / h264_video_rate_control_wrapper.cc [blame]
// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40285824): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include "h264_video_rate_control_wrapper.h"
#include "media/gpu/h264_ratectrl_rtc.h"
namespace media {
template <>
int H264RateControl::GetLoopfilterLevel() const {
DCHECK(impl_);
return impl_->GetLoopfilterLevel();
}
template <>
void H264RateControl::PostEncodeUpdate(uint64_t encoded_frame_size,
const FrameParams& frame_params) {
DCHECK(impl_);
return impl_->PostEncodeUpdate(encoded_frame_size,
ConvertFrameParams(frame_params));
}
template <>
H264RateControlConfigRTC H264RateControl::ConvertControlConfig(
const RateControlConfig& config) {
// Limit max delay for intra frame with HRD buffer size (500ms-1s for camera
// video, 1s-10s for desktop sharing).
constexpr base::TimeDelta kHRDBufferDelayCamera = base::Milliseconds(1000);
constexpr base::TimeDelta kHRDBufferDelayDisplay = base::Milliseconds(3000);
H264RateControlConfigRTC rc_config;
// Coded width and heght.
rc_config.frame_size.SetSize(config.width, config.height);
// Maximum GOP duration in milliseconds. It is set to maximum value.
rc_config.gop_max_duration = base::TimeDelta::Max();
// Source frame rate.
rc_config.frame_rate_max = static_cast<float>(config.framerate);
// Number of temopral layers.
rc_config.num_temporal_layers = config.ts_number_layers;
// Type of the video content (camera or display).
rc_config.content_type = config.content_type;
rc_config.fixed_delta_qp = config.fixed_delta_qp;
rc_config.ease_hrd_reduction = true;
for (int tid = 0; tid < config.ts_number_layers; ++tid) {
rc_config.layer_settings.emplace_back();
rc_config.layer_settings[tid].avg_bitrate =
config.layer_target_bitrate[tid] * 1000;
// Peak bitrate is set to 1.5 times the average bitrate.
rc_config.layer_settings[tid].peak_bitrate =
config.layer_target_bitrate[tid] * 1000 * 3 / 2;
base::TimeDelta buffer_delay;
if (config.content_type ==
VideoEncodeAccelerator::Config::ContentType::kCamera) {
buffer_delay = kHRDBufferDelayCamera;
} else {
buffer_delay = kHRDBufferDelayDisplay;
}
size_t buffer_size = static_cast<size_t>(
rc_config.layer_settings[tid].avg_bitrate *
buffer_delay.InMilliseconds() / base::Time::kMillisecondsPerSecond / 8);
rc_config.layer_settings[tid].hrd_buffer_size = buffer_size;
rc_config.layer_settings[tid].min_qp = config.min_quantizers[tid];
rc_config.layer_settings[tid].max_qp = config.max_quantizers[tid];
rc_config.layer_settings[tid].frame_rate = static_cast<float>(
config.framerate / (1 << (config.ts_number_layers - tid - 1)));
if (tid > 0) {
DCHECK_GT(rc_config.layer_settings[tid].avg_bitrate,
rc_config.layer_settings[tid - 1].avg_bitrate);
}
}
return rc_config;
}
template <>
H264FrameParamsRTC H264RateControl::ConvertFrameParams(
const FrameParams& frame_params) {
H264FrameParamsRTC rc_params;
rc_params.temporal_layer_id = frame_params.temporal_layer_id;
rc_params.keyframe =
frame_params.frame_type == FrameParams::FrameType::kKeyFrame;
rc_params.timestamp = base::Milliseconds(frame_params.timestamp);
return rc_params;
}
} // namespace media