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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.
//
// AudioInputDeviceManager manages the audio input devices. In particular it
// communicates with MediaStreamManager and AudioInputRendererHost on the
// browser IO thread, handles queries like
// enumerate/open/close/GetOpenedDeviceInfoById from MediaStreamManager and
// GetOpenedDeviceInfoById from AudioInputRendererHost.
// The work for enumerate/open/close is handled asynchronously on Media Stream
// device thread, while GetOpenedDeviceInfoById is synchronous on the IO thread.
#ifndef CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_INPUT_DEVICE_MANAGER_H_
#define CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_INPUT_DEVICE_MANAGER_H_
#include <map>
#include "base/basictypes.h"
#include "base/memory/ref_counted.h"
#include "base/threading/thread.h"
#include "content/browser/renderer_host/media/media_stream_provider.h"
#include "content/common/content_export.h"
#include "content/common/media/media_stream_options.h"
#include "content/public/common/media_stream_request.h"
#include "media/audio/audio_device_name.h"
namespace media {
class AudioManager;
}
namespace content {
class CONTENT_EXPORT AudioInputDeviceManager : public MediaStreamProvider {
public:
// Calling Start() with this kFakeOpenSessionId will open the default device,
// even though Open() has not been called. This is used to be able to use the
// AudioInputDeviceManager before MediaStream is implemented.
// TODO(xians): Remove it when the webrtc unittest does not need it any more.
static const int kFakeOpenSessionId;
explicit AudioInputDeviceManager(media::AudioManager* audio_manager);
// Gets the opened device info by |session_id|. Returns NULL if the device
// is not opened, otherwise the opened device. Called on IO thread.
const StreamDeviceInfo* GetOpenedDeviceInfoById(int session_id);
void Unregister();
// MediaStreamProvider implementation, called on IO thread.
void Register(MediaStreamProviderListener* listener,
const scoped_refptr<base::SingleThreadTaskRunner>&
device_task_runner) override;
void EnumerateDevices(MediaStreamType stream_type) override;
int Open(const StreamDeviceInfo& device) override;
void Close(int session_id) override;
void UseFakeDevice();
bool ShouldUseFakeDevice() const;
#if defined(OS_CHROMEOS)
// Registers and unregisters that a stream using keyboard mic has been opened
// or closed. Keeps count of how many such streams are open and activates and
// inactivates the keyboard mic accordingly. The (in)activation is done on the
// UI thread and for the register case a callback must therefor be provided
// which is called when activated.
// Called on the IO thread.
void RegisterKeyboardMicStream(const base::Closure& callback);
void UnregisterKeyboardMicStream();
#endif
private:
// Used by the unittests to get a list of fake devices.
friend class MediaStreamDispatcherHostTest;
void GetFakeDeviceNames(media::AudioDeviceNames* device_names);
typedef std::vector<StreamDeviceInfo> StreamDeviceList;
~AudioInputDeviceManager() override;
// Enumerates audio input devices on media stream device thread.
void EnumerateOnDeviceThread(MediaStreamType stream_type);
// Opens the device on media stream device thread.
void OpenOnDeviceThread(int session_id, const StreamDeviceInfo& info);
// Callback used by EnumerateOnDeviceThread(), called with a list of
// enumerated devices on IO thread.
void DevicesEnumeratedOnIOThread(MediaStreamType stream_type,
scoped_ptr<StreamDeviceInfoArray> devices);
// Callback used by OpenOnDeviceThread(), called with the session_id
// referencing the opened device on IO thread.
void OpenedOnIOThread(int session_id, const StreamDeviceInfo& info);
// Callback used by CloseOnDeviceThread(), called with the session_id
// referencing the closed device on IO thread.
void ClosedOnIOThread(MediaStreamType type, int session_id);
// Verifies that the calling thread is media stream device thread.
bool IsOnDeviceThread() const;
// Helper to return iterator to the device referenced by |session_id|. If no
// device is found, it will return devices_.end().
StreamDeviceList::iterator GetDevice(int session_id);
#if defined(OS_CHROMEOS)
// Calls Cras audio handler and sets keyboard mic active status.
void SetKeyboardMicStreamActiveOnUIThread(bool active);
#endif
// Only accessed on Browser::IO thread.
MediaStreamProviderListener* listener_;
int next_capture_session_id_;
bool use_fake_device_;
StreamDeviceList devices_;
#if defined(OS_CHROMEOS)
// Keeps count of how many streams are using keyboard mic.
int keyboard_mic_streams_count_;
#endif
media::AudioManager* const audio_manager_; // Weak.
// The message loop of media stream device thread that this object runs on.
scoped_refptr<base::SingleThreadTaskRunner> device_task_runner_;
DISALLOW_COPY_AND_ASSIGN(AudioInputDeviceManager);
};
} // namespace content
#endif // CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_INPUT_DEVICE_MANAGER_H_
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