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// Copyright (c) 2012 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.
//
// AudioRendererHost serves audio related requests from AudioRenderer which
// lives inside the render process and provide access to audio hardware.
//
// This class is owned by BrowserRenderProcessHost, and instantiated on UI
// thread, but all other operations and method calls happen on IO thread, so we
// need to be extra careful about the lifetime of this object. AudioManager is a
// singleton and created in IO thread, audio output streams are also created in
// the IO thread, so we need to destroy them also in IO thread. After this class
// is created, a task of OnInitialized() is posted on IO thread in which
// singleton of AudioManager is created.
//
// Here's an example of a typical IPC dialog for audio:
//
// Renderer AudioRendererHost
// | |
// | CreateStream > |
// | < NotifyStreamCreated |
// | |
// | PlayStream > |
// | < NotifyStreamStateChanged | kAudioStreamPlaying
// | |
// | PauseStream > |
// | < NotifyStreamStateChanged | kAudioStreamPaused
// | |
// | PlayStream > |
// | < NotifyStreamStateChanged | kAudioStreamPlaying
// | ... |
// | CloseStream > |
// v v
// A SyncSocket pair is used to signal buffer readiness between processes.
#ifndef CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_RENDERER_HOST_H_
#define CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_RENDERER_HOST_H_
#include <map>
#include "base/gtest_prod_util.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/process.h"
#include "base/sequenced_task_runner_helpers.h"
#include "base/shared_memory.h"
#include "content/common/content_export.h"
#include "content/public/browser/browser_message_filter.h"
#include "content/public/browser/browser_thread.h"
#include "media/audio/audio_io.h"
#include "media/audio/audio_output_controller.h"
#include "media/audio/simple_sources.h"
namespace media {
class AudioManager;
class AudioParameters;
}
namespace content {
class AudioMirroringManager;
class MediaInternals;
class MediaStreamManager;
class ResourceContext;
class CONTENT_EXPORT AudioRendererHost : public BrowserMessageFilter {
public:
// Called from UI thread from the owner of this object.
AudioRendererHost(int render_process_id,
media::AudioManager* audio_manager,
AudioMirroringManager* mirroring_manager,
MediaInternals* media_internals,
MediaStreamManager* media_stream_manager);
// BrowserMessageFilter implementation.
virtual void OnChannelClosing() OVERRIDE;
virtual void OnDestruct() const OVERRIDE;
virtual bool OnMessageReceived(const IPC::Message& message,
bool* message_was_ok) OVERRIDE;
private:
friend class AudioRendererHostTest;
friend class BrowserThread;
friend class base::DeleteHelper<AudioRendererHost>;
friend class MockAudioRendererHost;
FRIEND_TEST_ALL_PREFIXES(AudioRendererHostTest, CreateMockStream);
FRIEND_TEST_ALL_PREFIXES(AudioRendererHostTest, MockStreamDataConversation);
class AudioEntry;
typedef std::map<int, AudioEntry*> AudioEntryMap;
virtual ~AudioRendererHost();
// Methods called on IO thread ----------------------------------------------
// Audio related IPC message handlers.
// Creates an audio output stream with the specified format whose data is
// produced by an entity in the render view referenced by |render_view_id|.
// |session_id| is used for unified IO to find out which input device to be
// opened for the stream. For clients that do not use unified IO,
// |session_id| will be ignored.
// Upon success/failure, the peer is notified via the NotifyStreamCreated
// message.
void OnCreateStream(int stream_id,
int render_view_id,
int session_id,
const media::AudioParameters& params);
// Play the audio stream referenced by |stream_id|.
void OnPlayStream(int stream_id);
// Pause the audio stream referenced by |stream_id|.
void OnPauseStream(int stream_id);
// Close the audio stream referenced by |stream_id|.
void OnCloseStream(int stream_id);
// Set the volume of the audio stream referenced by |stream_id|.
void OnSetVolume(int stream_id, double volume);
// Complete the process of creating an audio stream. This will set up the
// shared memory or shared socket in low latency mode and send the
// NotifyStreamCreated message to the peer.
void DoCompleteCreation(AudioEntry* entry);
// Propagate audible signal to MediaObserver.
void DoNotifyAudibleState(AudioEntry* entry, bool is_audible);
// Send an error message to the renderer.
void SendErrorMessage(int stream_id);
// Delete an audio entry, notifying observers first. This is called by
// AudioOutputController after it has closed.
void DeleteEntry(scoped_ptr<AudioEntry> entry);
// Send an error message to the renderer, then close the stream.
void ReportErrorAndClose(int stream_id);
// A helper method to look up a AudioEntry identified by |stream_id|.
// Returns NULL if not found.
AudioEntry* LookupById(int stream_id);
// ID of the RenderProcessHost that owns this instance.
const int render_process_id_;
media::AudioManager* const audio_manager_;
AudioMirroringManager* const mirroring_manager_;
MediaInternals* const media_internals_;
// Used to access to AudioInputDeviceManager.
MediaStreamManager* media_stream_manager_;
// A map of stream IDs to audio sources.
AudioEntryMap audio_entries_;
DISALLOW_COPY_AND_ASSIGN(AudioRendererHost);
};
} // namespace content
#endif // CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_RENDERER_HOST_H_
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