15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright (c) 2012 The Chromium Authors. All rights reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// found in the LICENSE file. 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// AudioOutputDispatcher is a single-threaded base class that dispatches 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// creation and deletion of audio output streams. AudioOutputProxy objects use 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// this class to allocate and recycle actual audio output streams. When playback 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// is started, the proxy calls StartStream() to get an output stream that it 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// uses to play audio. When playback is stopped, the proxy returns the stream 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// back to the dispatcher by calling StopStream(). 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// AudioManagerBase creates one specialization of AudioOutputDispatcher on the 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// audio thread for each possible set of audio parameters. I.e streams with 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// different parameters are managed independently. The AudioOutputDispatcher 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// instance is then deleted on the audio thread when the AudioManager shuts 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// down. 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifndef MEDIA_AUDIO_AUDIO_OUTPUT_DISPATCHER_H_ 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define MEDIA_AUDIO_AUDIO_OUTPUT_DISPATCHER_H_ 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/basictypes.h" 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/memory/ref_counted.h" 23eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch#include "base/timer/timer.h" 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "media/audio/audio_io.h" 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "media/audio/audio_manager.h" 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "media/audio/audio_parameters.h" 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 28c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)namespace base { 295d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)class SingleThreadTaskRunner; 30c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)} 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace media { 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)class AudioOutputProxy; 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)class MEDIA_EXPORT AudioOutputDispatcher 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : public base::RefCountedThreadSafe<AudioOutputDispatcher> { 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) public: 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) AudioOutputDispatcher(AudioManager* audio_manager, 40868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) const AudioParameters& params, 415d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) const std::string& device_id); 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Called by AudioOutputProxy to open the stream. 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Returns false, if it fails to open it. 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual bool OpenStream() = 0; 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Called by AudioOutputProxy when the stream is started. 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Uses |callback| to get source data and report errors, if any. 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Does *not* take ownership of this callback. 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Returns true if started successfully, false otherwise. 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual bool StartStream(AudioOutputStream::AudioSourceCallback* callback, 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) AudioOutputProxy* stream_proxy) = 0; 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Called by AudioOutputProxy when the stream is stopped. 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Ownership of the |stream_proxy| is passed to the dispatcher. 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual void StopStream(AudioOutputProxy* stream_proxy) = 0; 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Called by AudioOutputProxy when the volume is set. 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual void StreamVolumeSet(AudioOutputProxy* stream_proxy, 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) double volume) = 0; 615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Called by AudioOutputProxy when the stream is closed. 635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual void CloseStream(AudioOutputProxy* stream_proxy) = 0; 645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Called on the audio thread when the AudioManager is shutting down. 665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual void Shutdown() = 0; 675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 685d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) const std::string& device_id() const { return device_id_; } 69868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) 705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) protected: 715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) friend class base::RefCountedThreadSafe<AudioOutputDispatcher>; 725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual ~AudioOutputDispatcher(); 735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // A no-reference-held pointer (we don't want circular references) back to the 755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // AudioManager that owns this object. 765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) AudioManager* audio_manager_; 775d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) const scoped_refptr<base::SingleThreadTaskRunner> task_runner_; 788bcbed890bc3ce4d7a057a8f32cab53fa534672eTorne (Richard Coles) const AudioParameters params_; 795d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) std::string device_id_; 805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) private: 825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DISALLOW_COPY_AND_ASSIGN(AudioOutputDispatcher); 835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace media 865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif // MEDIA_AUDIO_AUDIO_OUTPUT_DISPATCHER_H_ 88