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8bbdb5b9bd
We want to evaluate more data in order to make better choices in the bitrate allocators. In order to freely update the parameter list without breaking the API many times for projects customizing them, we'll use a struct instead. Bug: webrtc:10126 Change-Id: I443f86781c5134950294cdd1e3197a47447cf973 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/141418 Commit-Queue: Florent Castelli <orphis@webrtc.org> Reviewed-by: Tommi <tommi@webrtc.org> Reviewed-by: Erik Språng <sprang@webrtc.org> Cr-Commit-Position: refs/heads/master@{#28748}
54 lines
1.8 KiB
C++
54 lines
1.8 KiB
C++
/*
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* Copyright (c) 2016 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/utility/default_video_bitrate_allocator.h"
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#include <stddef.h>
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#include <stdint.h>
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#include <algorithm>
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namespace webrtc {
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DefaultVideoBitrateAllocator::DefaultVideoBitrateAllocator(
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const VideoCodec& codec)
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: codec_(codec) {}
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DefaultVideoBitrateAllocator::~DefaultVideoBitrateAllocator() {}
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// TODO(http://crbug.com/webrtc/9671): Do not split bitrate between simulcast
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// streams, but allocate everything to the first stream.
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VideoBitrateAllocation DefaultVideoBitrateAllocator::Allocate(
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VideoBitrateAllocationParameters parameters) {
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VideoBitrateAllocation allocation;
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if (parameters.total_bitrate.IsZero() || !codec_.active)
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return allocation;
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uint32_t allocated_bitrate_bps = parameters.total_bitrate.bps();
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allocated_bitrate_bps =
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std::max(allocated_bitrate_bps, codec_.minBitrate * 1000);
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if (codec_.maxBitrate > 0) {
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allocated_bitrate_bps =
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std::min(allocated_bitrate_bps, codec_.maxBitrate * 1000);
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}
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size_t num_simulcast_streams =
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std::max<size_t>(1, codec_.numberOfSimulcastStreams);
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// The bitrate is split between all the streams in proportion of powers of 2
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// e.g. 1:2, 1:2:4, etc.
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for (size_t i = 0; i < num_simulcast_streams; i++) {
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allocation.SetBitrate(
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i, 0,
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allocated_bitrate_bps * (1 << i) / ((1 << num_simulcast_streams) - 1));
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}
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return allocation;
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}
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} // namespace webrtc
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