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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.
//
// MessageFilter that handles audio input messages and delegates them to
// audio capturers. Created on render thread, AudioMessageFilter is operated on
// IO thread (secondary thread of render process), it intercepts audio messages
// and process them on IO thread since these messages are time critical.
#ifndef CONTENT_RENDERER_MEDIA_AUDIO_INPUT_MESSAGE_FILTER_H_
#define CONTENT_RENDERER_MEDIA_AUDIO_INPUT_MESSAGE_FILTER_H_
#include "base/id_map.h"
#include "base/shared_memory.h"
#include "base/sync_socket.h"
#include "content/common/content_export.h"
#include "ipc/ipc_channel_proxy.h"
#include "media/audio/audio_buffers_state.h"
#include "media/audio/audio_input_ipc.h"
class CONTENT_EXPORT AudioInputMessageFilter
: public IPC::ChannelProxy::MessageFilter,
public NON_EXPORTED_BASE(media::AudioInputIPC) {
public:
AudioInputMessageFilter();
// Getter for the one AudioInputMessageFilter object.
static AudioInputMessageFilter* Get();
// Implementation of AudioInputIPC.
virtual int AddDelegate(
media::AudioInputIPCDelegate* delegate) OVERRIDE;
virtual void RemoveDelegate(int id) OVERRIDE;
virtual void CreateStream(int stream_id, const media::AudioParameters& params,
const std::string& device_id, bool automatic_gain_control) OVERRIDE;
virtual void StartDevice(int stream_id, int session_id) OVERRIDE;
virtual void RecordStream(int stream_id) OVERRIDE;
virtual void CloseStream(int stream_id) OVERRIDE;
virtual void SetVolume(int stream_id, double volume) OVERRIDE;
private:
virtual ~AudioInputMessageFilter();
// Sends an IPC message using |channel_|.
bool Send(IPC::Message* message);
// IPC::ChannelProxy::MessageFilter override. Called on IO thread.
virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
virtual void OnFilterAdded(IPC::Channel* channel) OVERRIDE;
virtual void OnFilterRemoved() OVERRIDE;
virtual void OnChannelClosing() OVERRIDE;
// Received when browser process has created an audio input stream.
void OnStreamCreated(int stream_id, base::SharedMemoryHandle handle,
#if defined(OS_WIN)
base::SyncSocket::Handle socket_handle,
#else
base::FileDescriptor socket_descriptor,
#endif
uint32 length);
// Notification of volume property of an audio input stream.
void OnStreamVolume(int stream_id, double volume);
// Received when internal state of browser process' audio input stream has
// changed.
void OnStreamStateChanged(int stream_id,
media::AudioInputIPCDelegate::State state);
// Notification of the opened device of an audio session.
void OnDeviceStarted(int stream_id, const std::string& device_id);
// A map of stream ids to delegates.
IDMap<media::AudioInputIPCDelegate> delegates_;
IPC::Channel* channel_;
// The singleton instance for this filter.
static AudioInputMessageFilter* filter_;
DISALLOW_COPY_AND_ASSIGN(AudioInputMessageFilter);
};
#endif // CONTENT_RENDERER_MEDIA_AUDIO_INPUT_MESSAGE_FILTER_H_