Cloning a bunch of stuff from the native_client repository at r6528

ppapi/native_client/src/shared/ppapi_proxy/plugin_ppb_audio.h

+// Copyright 2010 The Native Client 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 NATIVE_CLIENT_SRC_SHARED_PPAPI_PROXY_PLUGIN_AUDIO_H_
+#define NATIVE_CLIENT_SRC_SHARED_PPAPI_PROXY_PLUGIN_AUDIO_H_
+
+#include <nacl/nacl_srpc.h>
+#include <pthread.h>
+#include "native_client/src/include/nacl_base.h"
+#include "native_client/src/include/nacl_macros.h"
+#include "native_client/src/include/portability.h"
+#include "native_client/src/include/ref_counted.h"
+#include "native_client/src/shared/ppapi_proxy/plugin_resource.h"
+#include "ppapi/c/pp_resource.h"
+#include "ppapi/c/ppb_audio.h"
+
+namespace ppapi_proxy {
+
+enum PluginAudioState {
+  AUDIO_INCOMPLETE = 0,  // StreamCreated not yet invoked
+  AUDIO_PENDING,         // Incomplete and app requested StartPlayback
+  AUDIO_READY,           // StreamCreated invoked, ready for playback
+  AUDIO_PLAYING          // Audio in playback
+};
+
+// Implements the untrusted side of the PPB_Audio interface.
+// All methods in PluginAudio class will be invoked on the main thread.
+// The only exception is AudioThread(), which will invoke the application
+// supplied callback to periodically obtain more audio data.
+class PluginAudio : public PluginResource {
+ public:
+  PluginAudio();
+  virtual ~PluginAudio();
+  void StreamCreated(NaClSrpcImcDescType socket,
+      NaClSrpcImcDescType shm, size_t shm_size);
+  void set_state(PluginAudioState state) { state_ = state; }
+  void set_callback(PPB_Audio_Callback user_callback, void* user_data) {
+      user_callback_ = user_callback;
+      user_data_ = user_data;
+  }
+  PluginAudioState state() { return state_; }
+  bool StartAudioThread();
+  bool StopAudioThread();
+  static void AudioThread(void* self);
+  static const PPB_Audio* GetInterface();
+  virtual bool InitFromBrowserResource(PP_Resource resource);
+ private:
+  PP_Resource resource_;
+  NaClSrpcImcDescType socket_;
+  NaClSrpcImcDescType shm_;
+  size_t shm_size_;
+  void *shm_buffer_;
+  PluginAudioState state_;
+  uintptr_t thread_id_;
+  bool thread_active_;
+  PPB_Audio_Callback user_callback_;
+  void* user_data_;
+  IMPLEMENT_RESOURCE(PluginAudio);
+  NACL_DISALLOW_COPY_AND_ASSIGN(PluginAudio);
+};
+
+}  // namespace ppapi_proxy
+
+#endif  // NATIVE_CLIENT_SRC_SHARED_PPAPI_PROXY_PLUGIN_AUDIO_H_