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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// AudioOutputDispatcherImpl is an implementation of AudioOutputDispatcher.
//
// To avoid opening and closing audio devices more frequently than necessary,
// each dispatcher has a pool of inactive physical streams. A stream is closed
// only if it hasn't been used for a certain period of time (specified via the
// constructor).
//
#ifndef MEDIA_AUDIO_AUDIO_OUTPUT_DISPATCHER_IMPL_H_
#define MEDIA_AUDIO_AUDIO_OUTPUT_DISPATCHER_IMPL_H_
#include <stddef.h>
#include <memory>
#include <string>
#include <vector>
#include "base/containers/flat_map.h"
#include "base/timer/timer.h"
#include "media/audio/audio_io.h"
#include "media/audio/audio_manager.h"
#include "media/audio/audio_output_dispatcher.h"
#include "media/base/audio_parameters.h"
namespace media {
class AudioLog;
class MEDIA_EXPORT AudioOutputDispatcherImpl
: public AudioOutputDispatcher,
public AudioManager::AudioDeviceListener {
public:
// |close_delay| specifies delay after the stream is idle until the audio
// device is closed.
AudioOutputDispatcherImpl(AudioManager* audio_manager,
const AudioParameters& params,
const std::string& output_device_id,
base::TimeDelta close_delay);
AudioOutputDispatcherImpl(const AudioOutputDispatcherImpl&) = delete;
AudioOutputDispatcherImpl& operator=(const AudioOutputDispatcherImpl&) =
delete;
~AudioOutputDispatcherImpl() override;
// AudioOutputDispatcher implementation.
AudioOutputProxy* CreateStreamProxy() override;
bool OpenStream() override;
bool StartStream(AudioOutputStream::AudioSourceCallback* callback,
AudioOutputProxy* stream_proxy) override;
void StopStream(AudioOutputProxy* stream_proxy) override;
void StreamVolumeSet(AudioOutputProxy* stream_proxy, double volume) override;
void CloseStream(AudioOutputProxy* stream_proxy) override;
void FlushStream(AudioOutputProxy* stream_proxy) override;
// AudioDeviceListener implementation.
void OnDeviceChange() override;
// Returns true if there are any open AudioOutputProxy objects.
bool HasOutputProxies() const;
// Closes all |idle_streams_|.
void CloseAllIdleStreams();
private:
// Creates a new physical output stream, opens it and pushes to
// |idle_streams_|. Returns false if the stream couldn't be created or
// opened.
bool CreateAndOpenStream();
// Similar to CloseAllIdleStreams(), but keeps |keep_alive| streams alive.
void CloseIdleStreams(size_t keep_alive);
void StopPhysicalStream(AudioOutputStream* stream);
// Output parameters.
const AudioParameters params_;
// Output device id.
const std::string device_id_;
size_t idle_proxies_;
std::vector<AudioOutputStream*> idle_streams_;
// When streams are stopped they're added to |idle_streams_|, if no stream is
// reused before |close_delay_| elapses |close_timer_| will run
// CloseIdleStreams().
base::DelayTimer close_timer_;
typedef base::flat_map<AudioOutputProxy*, AudioOutputStream*> AudioStreamMap;
AudioStreamMap proxy_to_physical_map_;
using AudioLogMap =
base::flat_map<AudioOutputStream*, std::unique_ptr<media::AudioLog>>;
AudioLogMap audio_logs_;
int audio_stream_id_;
base::WeakPtrFactory<AudioOutputDispatcherImpl> weak_factory_{this};
};
} // namespace media
#endif // MEDIA_AUDIO_AUDIO_OUTPUT_DISPATCHER_IMPL_H_
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