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// Copyright (c) 2011 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 PPAPI_SHARED_IMPL_AUDIO_IMPL_H_
#define PPAPI_SHARED_IMPL_AUDIO_IMPL_H_
#include "base/memory/scoped_ptr.h"
#include "base/shared_memory.h"
#include "base/sync_socket.h"
#include "base/threading/simple_thread.h"
#include "ppapi/c/ppb_audio.h"
#include "ppapi/shared_impl/resource_object_base.h"
#include "ppapi/thunk/ppb_audio_api.h"
namespace ppapi {
// Implements the logic to map shared memory and run the audio thread signaled
// from the sync socket. Both the proxy and the renderer implementation use
// this code.
class AudioImpl : public ResourceObjectBase,
public thunk::PPB_Audio_API,
public base::DelegateSimpleThread::Delegate {
public:
AudioImpl();
virtual ~AudioImpl();
// ResourceObjectBase implementation.
virtual ::ppapi::thunk::PPB_Audio_API* AsAudio_API() OVERRIDE;
bool playing() const { return playing_; }
// Sets the callback information that the background thread will use. This
// is optional. Without a callback, the thread will not be run. This
// non-callback mode is used in the renderer with the proxy, since the proxy
// handles the callback entirely within the plugin process.
void SetCallback(PPB_Audio_Callback callback, void* user_data);
// Configures the current state to be playing or not. The caller is
// responsible for ensuring the new state is the opposite of the current one.
//
// This is the implementation for PPB_Audio.Start/StopPlayback, except that
// it does not actually notify the audio system to stop playback, it just
// configures our object to stop generating callbacks. The actual stop
// playback request will be done in the derived classes and will be different
// from the proxy and the renderer.
void SetStartPlaybackState();
void SetStopPlaybackState();
// Sets the shared memory and socket handles. This will automatically start
// playback if we're currently set to play.
void SetStreamInfo(base::SharedMemoryHandle shared_memory_handle,
size_t shared_memory_size,
base::SyncSocket::Handle socket_handle);
private:
// Starts execution of the audio thread.
void StartThread();
// DelegateSimpleThread::Delegate implementation. Run on the audio thread.
virtual void Run();
// True if playing the stream.
bool playing_;
// Socket used to notify us when audio is ready to accept new samples. This
// pointer is created in StreamCreated().
scoped_ptr<base::SyncSocket> socket_;
// Sample buffer in shared memory. This pointer is created in
// StreamCreated(). The memory is only mapped when the audio thread is
// created.
scoped_ptr<base::SharedMemory> shared_memory_;
// The size of the sample buffer in bytes.
size_t shared_memory_size_;
// When the callback is set, this thread is spawned for calling it.
scoped_ptr<base::DelegateSimpleThread> audio_thread_;
// Callback to call when audio is ready to accept new samples.
PPB_Audio_Callback callback_;
// User data pointer passed verbatim to the callback function.
void* user_data_;
};
} // namespace ppapi
#endif // PPAPI_SHARED_IMPL_AUDIO_IMPL_H_
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