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// Copyright (c) 2010 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.
#ifndef CHROME_RENDERER_AUDIO_DEVICE_H_
#define CHROME_RENDERER_AUDIO_DEVICE_H_
#pragma once
#include <vector>
#include "base/basictypes.h"
#include "base/scoped_ptr.h"
#include "base/shared_memory.h"
#include "base/threading/simple_thread.h"
#include "chrome/renderer/audio_message_filter.h"
// Each instance of AudioDevice corresponds to one host stream.
// This class is not thread-safe, so its methods must be called from
// the same thread.
class AudioDevice : public AudioMessageFilter::Delegate,
public base::DelegateSimpleThread::Delegate {
public:
class RenderCallback {
public:
virtual void Render(const std::vector<float*>& audio_data,
size_t number_of_frames) = 0;
protected:
virtual ~RenderCallback() {}
};
// |buffer_size| is the number of sample-frames.
AudioDevice(size_t buffer_size,
int channels,
double sample_rate,
RenderCallback* callback);
virtual ~AudioDevice();
// Returns |true| on success.
bool Start();
bool Stop();
private:
// AudioMessageFilter::Delegate implementation.
virtual void OnRequestPacket(AudioBuffersState buffers_state);
virtual void OnStateChanged(const ViewMsg_AudioStreamState_Params& state);
virtual void OnCreated(base::SharedMemoryHandle handle, uint32 length);
virtual void OnLowLatencyCreated(base::SharedMemoryHandle handle,
base::SyncSocket::Handle socket_handle,
uint32 length);
virtual void OnVolume(double volume);
virtual void OnDestroy();
// DelegateSimpleThread::Delegate implementation.
virtual void Run();
// Format
size_t buffer_size_; // in sample-frames
int channels_;
double sample_rate_;
// Calls the client's callback for rendering audio.
void FireRenderCallback();
RenderCallback* callback_;
// The client callback renders audio into here.
std::vector<float*> audio_data_;
// Callbacks for rendering audio occur on this thread.
scoped_ptr<base::DelegateSimpleThread> audio_thread_;
// IPC message stuff.
base::SharedMemory* shared_memory() { return shared_memory_.get(); }
base::SyncSocket* socket() { return socket_.get(); }
void* shared_memory_data() { return shared_memory()->memory(); }
static scoped_refptr<AudioMessageFilter> filter_;
int32 stream_id_;
scoped_ptr<base::SharedMemory> shared_memory_;
scoped_ptr<base::SyncSocket> socket_;
DISALLOW_COPY_AND_ASSIGN(AudioDevice);
};
#endif // CHROME_RENDERER_AUDIO_DEVICE_H_
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