566124a6df
Since the webrtc_common build target does not have visibility set, we cannot easily use BitrateAllocation in other parts of Chromium. This is currently blocking parts of chromium:794608, and I know of other usage outside webrtc already, so moving it to api/ should be warranted. Also, since there's some naming confusion and this class is video specific rename it VideoBitrateAllocation. This also fits with the standard interface for producing these: VideoBitrateAllocator. Bug: chromium:794608 Change-Id: I4c0fae40f9365e860c605a76a4f67ecc9b9cf9fe Reviewed-on: https://webrtc-review.googlesource.com/70783 Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Reviewed-by: Niels Moller <nisse@webrtc.org> Commit-Queue: Erik Språng <sprang@webrtc.org> Cr-Commit-Position: refs/heads/master@{#22986}
86 lines
3.0 KiB
C++
86 lines
3.0 KiB
C++
/*
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* Copyright (c) 2018 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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#ifndef API_VIDEO_VIDEO_BITRATE_ALLOCATION_H_
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#define API_VIDEO_VIDEO_BITRATE_ALLOCATION_H_
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#include <limits>
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#include <string>
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#include <vector>
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#include "api/optional.h"
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#include "typedefs.h" // NOLINT(build/include)
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namespace webrtc {
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// TODO(sprang): Move back to common_types when include of this is removed.
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enum : int { kMaxSimulcastStreams = 4 };
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enum : int { kMaxSpatialLayers = 5 };
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enum : int { kMaxTemporalStreams = 4 };
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// Class that describes how video bitrate, in bps, is allocated across temporal
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// and spatial layers. Not that bitrates are NOT cumulative. Depending on if
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// layers are dependent or not, it is up to the user to aggregate.
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// For each index, the bitrate can also both set and unset. This is used with a
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// set bps = 0 to signal an explicit "turn off" signal.
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class VideoBitrateAllocation {
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public:
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static constexpr uint32_t kMaxBitrateBps =
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std::numeric_limits<uint32_t>::max();
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VideoBitrateAllocation();
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bool SetBitrate(size_t spatial_index,
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size_t temporal_index,
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uint32_t bitrate_bps);
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bool HasBitrate(size_t spatial_index, size_t temporal_index) const;
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uint32_t GetBitrate(size_t spatial_index, size_t temporal_index) const;
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// Whether the specific spatial layers has the bitrate set in any of its
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// temporal layers.
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bool IsSpatialLayerUsed(size_t spatial_index) const;
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// Get the sum of all the temporal layer for a specific spatial layer.
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uint32_t GetSpatialLayerSum(size_t spatial_index) const;
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// Sum of bitrates of temporal layers, from layer 0 to |temporal_index|
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// inclusive, of specified spatial layer |spatial_index|. Bitrates of lower
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// spatial layers are not included.
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uint32_t GetTemporalLayerSum(size_t spatial_index,
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size_t temporal_index) const;
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// Returns a vector of the temporal layer bitrates for the specific spatial
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// layer. Length of the returned vector is cropped to the highest temporal
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// layer with a defined bitrate.
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std::vector<uint32_t> GetTemporalLayerAllocation(size_t spatial_index) const;
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uint32_t get_sum_bps() const { return sum_; } // Sum of all bitrates.
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uint32_t get_sum_kbps() const {
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// Round down to not exceed the allocated bitrate.
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return sum_ / 1000;
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}
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bool operator==(const VideoBitrateAllocation& other) const;
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inline bool operator!=(const VideoBitrateAllocation& other) const {
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return !(*this == other);
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}
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std::string ToString() const;
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private:
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uint32_t sum_;
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rtc::Optional<uint32_t> bitrates_[kMaxSpatialLayers][kMaxTemporalStreams];
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};
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} // namespace webrtc
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#endif // API_VIDEO_VIDEO_BITRATE_ALLOCATION_H_
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