Rewrite PPB_AudioInput_Dev to use the new-style host/resource.

ppapi/proxy/audio_input_resource.h

+// 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.
+
+#ifndef PPAPI_PROXY_AUDIO_INPUT_RESOURCE_H_
+#define PPAPI_PROXY_AUDIO_INPUT_RESOURCE_H_
+
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/memory/ref_counted.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/proxy/plugin_resource.h"
+#include "ppapi/shared_impl/scoped_pp_resource.h"
+#include "ppapi/thunk/ppb_audio_input_api.h"
+
+namespace ppapi {
+
+struct DeviceRefData;
+
+namespace proxy {
+
+class ResourceMessageReplyParams;
+class SerializedHandle;
+
+class AudioInputResource : public PluginResource,
+                           public thunk::PPB_AudioInput_API,
+                           public base::DelegateSimpleThread::Delegate {
+ public:
+  AudioInputResource(Connection connection, PP_Instance instance);
+  virtual ~AudioInputResource();
+
+  // Resource overrides.
+  virtual thunk::PPB_AudioInput_API* AsPPB_AudioInput_API() OVERRIDE;
+
+  // PPB_AudioInput_API implementation.
+  virtual int32_t EnumerateDevices(
+      PP_Resource* devices,
+      scoped_refptr<TrackedCallback> callback) OVERRIDE;
+  virtual int32_t Open(const std::string& device_id,
+                       PP_Resource config,
+                       PPB_AudioInput_Callback audio_input_callback,
+                       void* user_data,
+                       scoped_refptr<TrackedCallback> callback) OVERRIDE;
+  virtual PP_Resource GetCurrentConfig() OVERRIDE;
+  virtual PP_Bool StartCapture() OVERRIDE;
+  virtual PP_Bool StopCapture() OVERRIDE;
+  virtual void Close() OVERRIDE;
+
+ private:
+  enum OpenState {
+    BEFORE_OPEN,
+    OPENED,
+    CLOSED
+  };
+
+  void OnPluginMsgEnumerateDevicesReply(
+      PP_Resource* devices_resource,
+      scoped_refptr<TrackedCallback> callback,
+      const ResourceMessageReplyParams& params,
+      const std::vector<DeviceRefData>& devices);
+  void OnPluginMsgOpenReply(const ResourceMessageReplyParams& params);
+
+  // Sets the shared memory and socket handles. This will automatically start
+  // capture if we're currently set to capture.
+  void SetStreamInfo(base::SharedMemoryHandle shared_memory_handle,
+                     size_t shared_memory_size,
+                     base::SyncSocket::Handle socket_handle);
+
+  // Starts execution of the audio input thread.
+  void StartThread();
+
+  // Stops execution of the audio input thread.
+  void StopThread();
+
+  // DelegateSimpleThread::Delegate implementation.
+  // Run on the audio input thread.
+  virtual void Run() OVERRIDE;
+
+  OpenState open_state_;
+
+  // True if capturing the stream.
+  bool capturing_;
+
+  // Socket used to notify us when new samples are available. This pointer is
+  // created in SetStreamInfo().
+  scoped_ptr<base::CancelableSyncSocket> socket_;
+
+  // Sample buffer in shared memory. This pointer is created in
+  // SetStreamInfo(). 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_input_thread_;
+
+  // Callback to call when new samples are available.
+  PPB_AudioInput_Callback audio_input_callback_;
+
+  // User data pointer passed verbatim to the callback function.
+  void* user_data_;
+
+  bool pending_enumerate_devices_;
+  // The callback is not directly passed to OnPluginMsgOpenReply() because we
+  // would like to be able to cancel it early in Close().
+  scoped_refptr<TrackedCallback> open_callback_;
+
+  // Owning reference to the current config object. This isn't actually used,
+  // we just dish it out as requested by the plugin.
+  ScopedPPResource config_;
+
+  DISALLOW_COPY_AND_ASSIGN(AudioInputResource);
+};
+
+}  // namespace proxy
+}  // namespace ppapi
+
+#endif  // PPAPI_PROXY_AUDIO_INPUT_RESOURCE_H_