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// Copyright 2013 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.
//
// This is the main interface for the cast sender.
//
// The AudioFrameInput, VideoFrameInput and PacketReciever interfaces should
// be accessed from the main thread.
#ifndef MEDIA_CAST_CAST_SENDER_H_
#define MEDIA_CAST_CAST_SENDER_H_
#include "base/callback.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/time/tick_clock.h"
#include "base/time/time.h"
#include "media/base/audio_bus.h"
#include "media/cast/cast_config.h"
#include "media/cast/cast_environment.h"
#include "media/cast/constants.h"
#include "media/cast/net/cast_transport_sender.h"
namespace gfx {
class Size;
}
namespace media {
class VideoFrame;
namespace cast {
class AudioSender;
class VideoSender;
class VideoFrameInput : public base::RefCountedThreadSafe<VideoFrameInput> {
public:
// Insert video frames into Cast sender. Frames will be encoded, packetized
// and sent to the network.
virtual void InsertRawVideoFrame(
const scoped_refptr<media::VideoFrame>& video_frame,
const base::TimeTicks& capture_time) = 0;
// Creates a |VideoFrame| optimized for the encoder. When available, these
// frames offer performance benefits, such as memory copy elimination. The
// format is guaranteed to be I420 or NV12.
//
// Not every encoder supports this method. Use |CanCreateOptimizedFrames| to
// determine if you can and should use this method.
//
// Even if |CanCreateOptimizedFrames| indicates support, there are transient
// conditions during a session where optimized frames cannot be provided. In
// this case, the caller must be able to account for a nullptr return value
// and instantiate its own media::VideoFrames.
virtual scoped_refptr<VideoFrame> MaybeCreateOptimizedFrame(
const gfx::Size& frame_size, base::TimeDelta timestamp) = 0;
// Returns true if the encoder supports creating optimized frames.
virtual bool CanCreateOptimizedFrames() const = 0;
protected:
virtual ~VideoFrameInput() {}
private:
friend class base::RefCountedThreadSafe<VideoFrameInput>;
};
class AudioFrameInput : public base::RefCountedThreadSafe<AudioFrameInput> {
public:
// Insert audio frames into Cast sender. Frames will be encoded, packetized
// and sent to the network.
virtual void InsertAudio(scoped_ptr<AudioBus> audio_bus,
const base::TimeTicks& recorded_time) = 0;
protected:
virtual ~AudioFrameInput() {}
private:
friend class base::RefCountedThreadSafe<AudioFrameInput>;
};
// Callback that is run to update the client with current status. This is used
// to allow the client to wait for asynchronous initialization to complete
// before sending frames, and also to be notified of any runtime errors that
// have halted the session.
using StatusChangeCallback = base::Callback<void(OperationalStatus)>;
// All methods of CastSender must be called on the main thread.
// Provided CastTransportSender will also be called on the main thread.
class CastSender {
public:
static scoped_ptr<CastSender> Create(
scoped_refptr<CastEnvironment> cast_environment,
CastTransportSender* const transport_sender);
virtual ~CastSender() {}
// All video frames for the session should be inserted to this object.
virtual scoped_refptr<VideoFrameInput> video_frame_input() = 0;
// All audio frames for the session should be inserted to this object.
virtual scoped_refptr<AudioFrameInput> audio_frame_input() = 0;
// Initialize the audio stack. Must be called in order to send audio frames.
// |status_change_cb| will be run as operational status changes.
virtual void InitializeAudio(
const AudioSenderConfig& audio_config,
const StatusChangeCallback& status_change_cb) = 0;
// Initialize the video stack. Must be called in order to send video frames.
// |status_change_cb| will be run as operational status changes.
//
// TODO(miu): Remove the VEA-specific callbacks. http://crbug.com/454029
virtual void InitializeVideo(
const VideoSenderConfig& video_config,
const StatusChangeCallback& status_change_cb,
const CreateVideoEncodeAcceleratorCallback& create_vea_cb,
const CreateVideoEncodeMemoryCallback& create_video_encode_mem_cb) = 0;
// Change the target delay. This is only valid if the receiver
// supports the "adaptive_target_delay" rtp extension.
virtual void SetTargetPlayoutDelay(
base::TimeDelta new_target_playout_delay) = 0;
};
} // namespace cast
} // namespace media
#endif // MEDIA_CAST_CAST_SENDER_H_
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