Implement audio proxy for Pepper.

In addition to the basic proxying, this required some changes to the dispatcher
and process infrastructure to get the handles of the processes available when
I need them so I can duplicate the shared memory handles properly into the
different processes.

TEST=none
BUG=none
Review URL: http://codereview.chromium.org/4985001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@68026 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 78 insertions, 0 deletions

diff --git a/ppapi/proxy/ppb_audio_proxy.h b/ppapi/proxy/ppb_audio_proxy.h
new file mode 100644
index 0000000..a6d2738
--- /dev/null
+++ b/ppapi/proxy/ppb_audio_proxy.h
@@ -0,0 +1,78 @@
+// 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 PPAPI_PROXY_PPB_AUDIO_PROXY_H_
+#define PPAPI_PROXY_PPB_AUDIO_PROXY_H_
+
+#include "base/basictypes.h"
+#include "base/shared_memory.h"
+#include "base/sync_socket.h"
+#include "ipc/ipc_platform_file.h"
+#include "ppapi/c/pp_instance.h"
+#include "ppapi/c/pp_module.h"
+#include "ppapi/c/pp_resource.h"
+#include "ppapi/cpp/completion_callback.h"
+#include "ppapi/proxy/interface_proxy.h"
+#include "ppapi/proxy/proxy_non_thread_safe_ref_count.h"
+
+struct PPB_Audio_Dev;
+
+namespace pp {
+namespace proxy {
+
+class PPB_Audio_Proxy : public InterfaceProxy {
+ public:
+  PPB_Audio_Proxy(Dispatcher* dispatcher, const void* target_interface);
+  virtual ~PPB_Audio_Proxy();
+
+  const PPB_Audio_Dev* ppb_audio_target() const {
+    return static_cast<const PPB_Audio_Dev*>(target_interface());
+  }
+
+  // InterfaceProxy implementation.
+  virtual const void* GetSourceInterface() const;
+  virtual InterfaceID GetInterfaceId() const;
+  virtual void OnMessageReceived(const IPC::Message& msg);
+
+ private:
+  // Plugin->renderer message handlers.
+  void OnMsgCreate(PP_Instance instance_id,
+                   PP_Resource config_id,
+                   PP_Resource* result);
+  void OnMsgStartOrStop(PP_Resource audio_id, bool play);
+
+  // Renderer->plugin message handlers.
+  void OnMsgNotifyAudioStreamCreated(
+      PP_Resource audio_id,
+      int32_t result_code,
+      IPC::PlatformFileForTransit socket_handle,
+      base::SharedMemoryHandle shared_memory_handle,
+      uint32_t shared_memory_length);
+
+  void AudioChannelConnected(int32_t result, PP_Resource resource);
+
+  // In the renderer, this is called in response to a stream created message.
+  // It will retrieve the shared memory and socket handles and place them into
+  // the given out params. The return value is a PPAPI error code.
+  //
+  // The input arguments should be initialized to 0 or -1, depending on the
+  // platform's default invalid handle values. On error, some of these
+  // arguments may be written to, and others may be untouched, depending on
+  // where the error occurred.
+  int32_t GetAudioConnectedHandles(
+      PP_Resource resource,
+      IPC::PlatformFileForTransit* foreign_socket_handle,
+      base::SharedMemoryHandle* foreign_shared_memory_handle,
+      uint32_t* shared_memory_length);
+
+  CompletionCallbackFactory<PPB_Audio_Proxy,
+                            ProxyNonThreadSafeRefCount> callback_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(PPB_Audio_Proxy);
+};
+
+}  // namespace proxy
+}  // namespace pp
+
+#endif  // PPAPI_PROXY_PPB_AUDIO_PROXY_H_