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// Copyright 2014 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_CAST_SENDER_VIDEO_ENCODER_H_
#define MEDIA_CAST_SENDER_VIDEO_ENCODER_H_
#include "base/callback.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/time/time.h"
#include "media/base/video_frame.h"
#include "media/cast/cast_config.h"
#include "media/cast/cast_environment.h"
namespace media {
namespace cast {
class VideoFrameFactory;
// All these functions are called from the main cast thread.
class VideoEncoder {
public:
typedef base::Callback<void(scoped_ptr<EncodedFrame>)> FrameEncodedCallback;
virtual ~VideoEncoder() {}
// Returns true if the size of video frames passed in successive calls to
// EncodedVideoFrame() can vary.
virtual bool CanEncodeVariedFrameSizes() const = 0;
// If true is returned, the Encoder has accepted the request and will process
// it asynchronously, running |frame_encoded_callback| on the MAIN
// CastEnvironment thread with the result. If false is returned, nothing
// happens and the callback will not be run.
virtual bool EncodeVideoFrame(
const scoped_refptr<media::VideoFrame>& video_frame,
const base::TimeTicks& reference_time,
const FrameEncodedCallback& frame_encoded_callback) = 0;
// Inform the encoder about the new target bit rate.
virtual void SetBitRate(int new_bit_rate) = 0;
// Inform the encoder to encode the next frame as a key frame.
virtual void GenerateKeyFrame() = 0;
// Inform the encoder to only reference frames older or equal to frame_id;
virtual void LatestFrameIdToReference(uint32 frame_id) = 0;
// Creates a |VideoFrameFactory| object to vend |VideoFrame| object with
// encoder affinity (defined as offering some sort of performance benefit).
// This is an optional capability and by default returns null.
virtual scoped_ptr<VideoFrameFactory> CreateVideoFrameFactory();
// Instructs the encoder to finish and emit all frames that have been
// submitted for encoding. An encoder may hold a certain number of frames for
// analysis. Under certain network conditions, particularly when there is
// network congestion, it is necessary to flush out of the encoder all
// submitted frames so that eventually new frames may be encoded. Like
// EncodeVideoFrame(), the encoder will process this request asynchronously.
virtual void EmitFrames();
};
} // namespace cast
} // namespace media
#endif // MEDIA_CAST_SENDER_VIDEO_ENCODER_H_
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