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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_VIDEO_ENCODER_H_
#define MEDIA_BASE_VIDEO_ENCODER_H_
#include "base/callback.h"
#include "base/macros.h"
#include "base/optional.h"
#include "media/base/media_export.h"
#include "media/base/status.h"
#include "media/base/video_codecs.h"
#include "ui/gfx/geometry/size.h"
namespace media {
class VideoFrame;
// Encoded video frame, its data and metadata.
struct MEDIA_EXPORT VideoEncoderOutput {
VideoEncoderOutput();
VideoEncoderOutput(VideoEncoderOutput&&);
~VideoEncoderOutput();
// Feel free take this buffer out and use underlying memory as is without
// copying.
std::unique_ptr<uint8_t[]> data;
size_t size;
base::TimeDelta timestamp;
bool key_frame;
};
class MEDIA_EXPORT VideoEncoder {
public:
struct MEDIA_EXPORT Options {
Options();
~Options();
base::Optional<uint64_t> bitrate;
double framerate = 30.0;
int width = 0;
int height = 0;
base::Optional<int> threads;
base::Optional<int> keyframe_interval = 10000;
};
// Callback for VideoEncoder to report an encoded video frame whenever it
// becomes available.
using OutputCB = base::RepeatingCallback<void(VideoEncoderOutput output)>;
// Callback to report success and errors in encoder calls.
using StatusCB = base::OnceCallback<void(Status error)>;
VideoEncoder();
virtual ~VideoEncoder();
// Initializes a VideoEncoder with the given |options|, executing the
// |done_cb| upon completion. |output_cb| is called for each encoded frame
// produced by the coder.
//
// Note:
// 1) Can't be called more than once for the same instance of the encoder.
// 2) No VideoEncoder calls should be made before |done_cb| is executed.
virtual void Initialize(VideoCodecProfile profile,
const Options& options,
OutputCB output_cb,
StatusCB done_cb) = 0;
// Requests a |frame| to be encoded. The status of the encoder and the frame
// are returned via the provided callback |done_cb|.
//
// |done_cb| will not be called from within this method, and that it will be
// called even if Encode() is never called again.
// After the frame, or several frames, are encoded the encoder calls
// |output_cb| specified in Initialize() for available VideoEncoderOutput.
// |output_cb| may be called before or after |done_cb|,
// including before Encode() returns.
// Encode() does not expect EOS frames, use Flush() to finalize the stream
// and harvest the outputs.
virtual void Encode(scoped_refptr<const VideoFrame> frame,
bool key_frame,
StatusCB done_cb) = 0;
// Adjust encoder options for future frames, executing the
// |done_cb| upon completion.
//
// Note:
// 1. Not all options can be changed on the fly.
// 2. ChangeOptions() should be called after calling Flush() and waiting
// for it to finish.
virtual void ChangeOptions(const Options& options, StatusCB done_cb) = 0;
// Requests all outputs for already encoded frames to be
// produced via |output_cb| and calls |dene_cb| after that.
virtual void Flush(StatusCB done_cb) = 0;
protected:
DISALLOW_COPY_AND_ASSIGN(VideoEncoder);
};
} // namespace media
#endif // MEDIA_BASE_VIDEO_ENCODER_H_
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