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- // Copyright 2018 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #ifndef MEDIA_GPU_GPU_VIDEO_ENCODE_ACCELERATOR_HELPERS_H_
- #define MEDIA_GPU_GPU_VIDEO_ENCODE_ACCELERATOR_HELPERS_H_
- #include <vector>
- #include "media/base/bitrate.h"
- #include "media/base/video_bitrate_allocation.h"
- #include "media/gpu/media_gpu_export.h"
- #include "media/video/video_encode_accelerator.h"
- #include "ui/gfx/geometry/size.h"
- namespace media {
- class Bitrate;
- // Helper functions for VideoEncodeAccelerator implementations in GPU process.
- // Calculate the bitstream buffer size for VideoEncodeAccelerator.
- // |size|: the resolution of video stream
- // |bitrate|: the bit rate in bps
- // |framerate|: the frame rate in fps
- MEDIA_GPU_EXPORT size_t GetEncodeBitstreamBufferSize(const gfx::Size& size,
- uint32_t bitrate,
- uint32_t framerate);
- // Get the maximum bitstream buffer size for VideoEncodeAccelerator.
- // |size|: the resolution of video stream
- MEDIA_GPU_EXPORT size_t GetEncodeBitstreamBufferSize(const gfx::Size& size);
- // Get the frame rate fraction assigned to each temporal layer.
- // |num_temporal_layers|: total number of temporal layers
- MEDIA_GPU_EXPORT std::vector<uint8_t> GetFpsAllocation(
- size_t num_temporal_layers);
- // Create default VideoBitrateAllocation from |config|. A bitrate of each
- // spatial layer (|config.spatial_layers[i].bitrate_bps| is distributed to
- // temporal layers in the spatial layer based on the same bitrate division ratio
- // as a software encoder. If |config.spatial_layers| is empty,
- // VideoBitrateAllocation(0, 0) is set to |config.bitrate.target_bps()| as it is
- // a configuration with no layers.
- MEDIA_GPU_EXPORT VideoBitrateAllocation
- AllocateBitrateForDefaultEncoding(const VideoEncodeAccelerator::Config& config);
- // Create VideoBitrateAllocation with |num_spatial_layers|,
- // |num_temporal_layers| and |bitrate|. |bitrate.target_bps()| is the bitrate of
- // the entire stream. |num_temporal_layers| is the number of temporal layers in
- // each spatial layer.
- // First, |bitrate.target_bps()| is distributed to spatial layers based on
- // libwebrtc bitrate division. Then the bitrate of each spatial layer is
- // distributed to temporal layers in the spatial layer based on the same bitrate
- // division ratio as a software encoder. If a variable bitrate is requested,
- // that is, |bitrate.mode()| is Bitrate::Mode::Variable, the peak will be set
- // equal to the |bitrate.peak_bps()|.
- MEDIA_GPU_EXPORT VideoBitrateAllocation
- AllocateDefaultBitrateForTesting(const size_t num_spatial_layers,
- const size_t num_temporal_layers,
- const Bitrate& bitrate);
- } // namespace media
- #endif // MEDIA_GPU_GPU_VIDEO_ENCODE_ACCELERATOR_HELPERS_H_
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