Add Pepper VideoReader and VideoWriter plumbing

content/renderer/pepper/pepper_video_destination_host.cc

+// Copyright (c) 2013 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.
+
+#include "content/renderer/pepper/pepper_video_destination_host.h"
+
+#include "base/bind.h"
+#include "content/public/renderer/renderer_ppapi_host.h"
+#include "ppapi/c/pp_errors.h"
+#include "ppapi/host/dispatch_host_message.h"
+#include "ppapi/host/host_message_context.h"
+#include "ppapi/host/ppapi_host.h"
+#include "ppapi/proxy/ppapi_messages.h"
+#include "ppapi/thunk/enter.h"
+#include "ppapi/thunk/ppb_image_data_api.h"
+#include "webkit/plugins/ppapi/ppb_image_data_impl.h"
+
+using ppapi::host::HostMessageContext;
+using ppapi::host::ReplyMessageContext;
+
+namespace content {
+
+PepperVideoDestinationHost::PepperVideoDestinationHost(
+    RendererPpapiHost* host,
+    PP_Instance instance,
+    PP_Resource resource)
+    : ResourceHost(host->GetPpapiHost(), instance, resource),
+      renderer_ppapi_host_(host),
+      weak_factory_(ALLOW_THIS_IN_INITIALIZER_LIST(this)) {
+}
+
+PepperVideoDestinationHost::~PepperVideoDestinationHost() {
+}
+
+int32_t PepperVideoDestinationHost::OnResourceMessageReceived(
+    const IPC::Message& msg,
+    HostMessageContext* context) {
+  if (!host()->permissions().HasPermission(ppapi::PERMISSION_PRIVATE))

[yzshen1, 2013/05/01 23:18:33]

If we don't have private permission, this host instance won't be created from
the beginning, right?

[bbudge, 2013/05/02 21:39:06]

True. Removed the check. I copied this from other hosts.
On 2013/05/01 23:18:33, yzshen1 wrote:

+    return PP_ERROR_FAILED;
+
+  IPC_BEGIN_MESSAGE_MAP(PepperVideoDestinationHost, msg)
+    PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(PpapiHostMsg_VideoDestination_Open,
+                                        OnHostMsgOpen)
+    PPAPI_DISPATCH_HOST_RESOURCE_CALL(PpapiHostMsg_VideoDestination_PutFrame,
+                                      OnHostMsgPutFrame)
+    PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(PpapiHostMsg_VideoDestination_Close,
+                                        OnHostMsgClose)
+  IPC_END_MESSAGE_MAP()
+  return PP_ERROR_FAILED;
+}
+
+int32_t PepperVideoDestinationHost::OnHostMsgOpen(HostMessageContext* context) {
+  ReplyMessageContext reply_context = context->MakeReplyMessageContext();
+  reply_context.params.set_result(PP_ERROR_FAILED);
+  host()->SendReply(reply_context,
+                    PpapiPluginMsg_VideoDestination_OpenReply());
+  return PP_OK_COMPLETIONPENDING;

[yzshen1, 2013/05/01 23:18:33]

nit, optional: you could set context->reply_msg and return PP_ERROR_FAILED
directly.

[bbudge, 2013/05/02 21:39:06]

Done.

+}
+
+int32_t PepperVideoDestinationHost::OnHostMsgPutFrame(
+    HostMessageContext* context,
+    const ppapi::HostResource& image_data,
+    double timestamp) {
+  ReplyMessageContext reply_context = context->MakeReplyMessageContext();
+
+  ppapi::thunk::EnterResourceNoLock<ppapi::thunk::PPB_ImageData_API> enter(
+      image_data.host_resource(), true);
+  if (enter.failed())
+    return PP_ERROR_BADRESOURCE;
+  webkit::ppapi::PPB_ImageData_Impl* image_resource =
+      static_cast<webkit::ppapi::PPB_ImageData_Impl*>(enter.object());
+
+  if (!webkit::ppapi::PPB_ImageData_Impl::IsImageDataFormatSupported(
+          image_resource->format()))
+    return PP_ERROR_BADARGUMENT;
+
+  // TODO() write image data to MediaStream video track.
+
+  reply_context.params.set_result(PP_ERROR_FAILED);
+  return PP_OK_COMPLETIONPENDING;
+}
+
+int32_t PepperVideoDestinationHost::OnHostMsgClose(
+    HostMessageContext* context) {
+  // Close the video stream.
+  return PP_OK;
+}
+
+}  // namespace content