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- // Copyright 2020 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_BASE_OFFLOADING_VIDEO_ENCODER_H_
- #define MEDIA_BASE_OFFLOADING_VIDEO_ENCODER_H_
- #include <memory>
- #include <type_traits>
- #include "base/sequence_checker.h"
- #include "media/base/video_encoder.h"
- namespace base {
- class SequencedTaskRunner;
- }
- namespace media {
- // A wrapper around video encoder that offloads all the calls to a dedicated
- // task runner. It's used to move synchronous software encoding work off the
- // current (main) thread.
- class MEDIA_EXPORT OffloadingVideoEncoder final : public VideoEncoder {
- public:
- // |work_runner| - task runner for encoding work
- // |callback_runner| - all encoder's callbacks will be executed on this task
- // runner.
- OffloadingVideoEncoder(
- std::unique_ptr<VideoEncoder> wrapped_encoder,
- const scoped_refptr<base::SequencedTaskRunner> work_runner,
- const scoped_refptr<base::SequencedTaskRunner> callback_runner);
- // Uses current task runner for callbacks and asks thread pool for a new task
- // runner to do actual encoding work.
- explicit OffloadingVideoEncoder(
- std::unique_ptr<VideoEncoder> wrapped_encoder);
- ~OffloadingVideoEncoder() override;
- void Initialize(VideoCodecProfile profile,
- const Options& options,
- OutputCB output_cb,
- EncoderStatusCB done_cb) override;
- void Encode(scoped_refptr<VideoFrame> frame,
- bool key_frame,
- EncoderStatusCB done_cb) override;
- void ChangeOptions(const Options& options,
- OutputCB output_cb,
- EncoderStatusCB done_cb) override;
- void Flush(EncoderStatusCB done_cb) override;
- private:
- template <class T>
- T WrapCallback(T cb);
- std::unique_ptr<VideoEncoder> wrapped_encoder_;
- const scoped_refptr<base::SequencedTaskRunner> work_runner_;
- const scoped_refptr<base::SequencedTaskRunner> callback_runner_;
- SEQUENCE_CHECKER(sequence_checker_);
- };
- } // namespace media
- #endif // MEDIA_BASE_OFFLOADING_VIDEO_ENCODER_H_
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