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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_AUDIO_SENDER_H_
#define MEDIA_CAST_SENDER_AUDIO_SENDER_H_
#include <memory>
#include "base/callback.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_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_sender.h"
#include "media/cast/sender/frame_sender.h"
namespace media {
namespace cast {
class AudioEncoder;
// Not thread safe. Only called from the main cast thread.
// This class owns all objects related to sending audio, objects that create RTP
// packets, congestion control, audio encoder, parsing and sending of
// RTCP packets.
// Additionally it posts a bunch of delayed tasks to the main thread for various
// timeouts.
class AudioSender : public FrameSender {
public:
AudioSender(scoped_refptr<CastEnvironment> cast_environment,
const FrameSenderConfig& audio_config,
const StatusChangeCallback& status_change_cb,
CastTransport* const transport_sender);
~AudioSender() final;
// Note: It is not guaranteed that |audio_frame| will actually be encoded and
// sent, if AudioSender detects too many frames in flight. Therefore, clients
// should be careful about the rate at which this method is called.
void InsertAudio(std::unique_ptr<AudioBus> audio_bus,
const base::TimeTicks& recorded_time);
base::WeakPtr<AudioSender> AsWeakPtr();
protected:
int GetNumberOfFramesInEncoder() const final;
base::TimeDelta GetInFlightMediaDuration() const final;
private:
// Called by the |audio_encoder_| with the next EncodedFrame to send.
void OnEncodedAudioFrame(int encoder_bitrate,
std::unique_ptr<SenderEncodedFrame> encoded_frame,
int samples_skipped);
// Encodes AudioBuses into EncodedFrames.
std::unique_ptr<AudioEncoder> audio_encoder_;
// The number of audio samples enqueued in |audio_encoder_|.
int samples_in_encoder_;
// NOTE: Weak pointers must be invalidated before all other member variables.
base::WeakPtrFactory<AudioSender> weak_factory_{this};
DISALLOW_COPY_AND_ASSIGN(AudioSender);
};
} // namespace cast
} // namespace media
#endif // MEDIA_CAST_SENDER_AUDIO_SENDER_H_