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88fe84b7fb
Now vp9 screenshare would enable new layers as soon as requested and will force all spatial layers present on the next frame, even if they should be dropped because of frame-rate limiting. This might cause frame-rate liming to be exceeded if layer is toggling on and off very often, but this situation is bad itself. E.g. in realtime video it will cause too many key-frames. Now SvcRateAllocator and VP9EncoderImpl are aware that there may be some skipped layers before the first enabled. Key-frames and ss_info triggering logic is also updated. Bug: webrtc:10977 Change-Id: Ie2555210c0368a1d3c51ddf6670d0052e6d679de Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/153483 Commit-Queue: Ilya Nikolaevskiy <ilnik@webrtc.org> Reviewed-by: Sergey Silkin <ssilkin@webrtc.org> Cr-Commit-Position: refs/heads/master@{#29296}
62 lines
2.1 KiB
C++
62 lines
2.1 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 MODULES_VIDEO_CODING_CODECS_VP9_SVC_RATE_ALLOCATOR_H_
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#define MODULES_VIDEO_CODING_CODECS_VP9_SVC_RATE_ALLOCATOR_H_
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#include <stddef.h>
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#include <stdint.h>
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#include "absl/container/inlined_vector.h"
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#include "api/video/video_bitrate_allocation.h"
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#include "api/video/video_bitrate_allocator.h"
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#include "api/video/video_codec_constants.h"
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#include "api/video_codecs/video_codec.h"
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#include "rtc_base/experiments/stable_target_rate_experiment.h"
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namespace webrtc {
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class SvcRateAllocator : public VideoBitrateAllocator {
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public:
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explicit SvcRateAllocator(const VideoCodec& codec);
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VideoBitrateAllocation Allocate(
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VideoBitrateAllocationParameters parameters) override;
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static DataRate GetMaxBitrate(const VideoCodec& codec);
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static DataRate GetPaddingBitrate(const VideoCodec& codec);
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static absl::InlinedVector<DataRate, kMaxSpatialLayers> GetLayerStartBitrates(
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const VideoCodec& codec);
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private:
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VideoBitrateAllocation GetAllocationNormalVideo(
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DataRate total_bitrate,
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size_t first_active_layer,
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size_t num_spatial_layers) const;
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VideoBitrateAllocation GetAllocationScreenSharing(
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DataRate total_bitrate,
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size_t first_active_layer,
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size_t num_spatial_layers) const;
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// Returns the number of layers that are active and have enough bitrate to
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// actually be enabled.
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size_t FindNumEnabledLayers(DataRate target_rate) const;
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const VideoCodec codec_;
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const StableTargetRateExperiment experiment_settings_;
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const absl::InlinedVector<DataRate, kMaxSpatialLayers>
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cumulative_layer_start_bitrates_;
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size_t last_active_layer_count_;
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};
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} // namespace webrtc
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#endif // MODULES_VIDEO_CODING_CODECS_VP9_SVC_RATE_ALLOCATOR_H_
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