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media / video / offloading_video_encoder.h [blame]
// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef MEDIA_VIDEO_OFFLOADING_VIDEO_ENCODER_H_
#define MEDIA_VIDEO_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,
EncoderInfoCB info_cb,
OutputCB output_cb,
EncoderStatusCB done_cb) override;
void Encode(scoped_refptr<VideoFrame> frame,
const EncodeOptions& encode_options,
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_VIDEO_OFFLOADING_VIDEO_ENCODER_H_