Add Pepper VideoReader and VideoWriter plumbing

content/renderer/pepper/pepper_video_source_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_source_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/proxy/ppb_image_data_proxy.h"
+#include "ppapi/shared_impl/scoped_pp_resource.h"
+#include "ppapi/thunk/enter.h"
+#include "ppapi/thunk/ppb_image_data_api.h"
+#include "skia/ext/platform_canvas.h"
+#include "webkit/plugins/ppapi/ppb_image_data_impl.h"
+
+using ppapi::host::HostMessageContext;
+using ppapi::host::ReplyMessageContext;
+
+namespace content {
+
+PepperVideoSourceHost::PepperVideoSourceHost(
+    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)),
+      last_timestamp_(0) {
+}
+
+PepperVideoSourceHost::~PepperVideoSourceHost() {
+}
+
+int32_t PepperVideoSourceHost::OnResourceMessageReceived(
+    const IPC::Message& msg,
+    HostMessageContext* context) {
+  if (!host()->permissions().HasPermission(ppapi::PERMISSION_PRIVATE))

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

We won't create this instance from the begining if we don't have private
permission, right?

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

Done.

+    return PP_ERROR_FAILED;
+
+  IPC_BEGIN_MESSAGE_MAP(PepperVideoSourceHost, msg)
+    PPAPI_DISPATCH_HOST_RESOURCE_CALL(PpapiHostMsg_VideoSource_Open,
+                                      OnHostMsgOpen)
+    PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(PpapiHostMsg_VideoSource_GetFrame,
+                                        OnHostMsgGetFrame)
+    PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(PpapiHostMsg_VideoSource_Close,
+                                        OnHostMsgClose)
+  IPC_END_MESSAGE_MAP()
+  return PP_ERROR_FAILED;
+}
+
+int32_t PepperVideoSourceHost::OnHostMsgOpen(HostMessageContext* context,
+                                             const std::string& stream_id) {
+  ReplyMessageContext reply_context = context->MakeReplyMessageContext();
+  // TODO() Create the video stream here and return error / result code.
+  reply_context.params.set_result(PP_ERROR_FAILED);
+  host()->SendReply(reply_context, PpapiPluginMsg_VideoSource_OpenReply());
+  return PP_OK_COMPLETIONPENDING;
+}
+
+int32_t PepperVideoSourceHost::OnHostMsgGetFrame(
+    HostMessageContext* context) {
+  ReplyMessageContext reply_context = context->MakeReplyMessageContext();
+  // TODO() Check next available frame's timestamp. Wait until it changes.

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

Please add a name for the TODO.

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

Done.

+  // Create an image data resource to hold the frame pixels.
+  PP_ImageDataDesc desc;
+  IPC::PlatformFileForTransit image_handle;
+  uint32_t byte_count;
+  ppapi::ScopedPPResource resource(
+      ppapi::ScopedPPResource::PassRef(),
+      ppapi::proxy::PPB_ImageData_Proxy::CreateImageData(
+          pp_instance(),
+          webkit::ppapi::PPB_ImageData_Impl::GetNativeImageDataFormat(),
+          PP_MakeSize(0, 0),
+          false /* init_to_zero */,
+          false /* is_nacl_plugin */,
+          &desc, &image_handle, &byte_count));
+  if (!resource.get())
+    return PP_ERROR_FAILED;
+
+  ppapi::thunk::EnterResourceNoLock<ppapi::thunk::PPB_ImageData_API>
+      enter_resource(resource, false);
+  if (enter_resource.failed())
+    return PP_ERROR_FAILED;
+
+  webkit::ppapi::PPB_ImageData_Impl* image_data =
+      static_cast<webkit::ppapi::PPB_ImageData_Impl*>(enter_resource.object());
+  webkit::ppapi::ImageDataAutoMapper mapper(image_data);
+  if (!mapper.is_valid())
+    return PP_ERROR_FAILED;
+
+  // TODO() Copy frame pixels to canvas.
+  //skia::PlatformCanvas* canvas = image_data->GetPlatformCanvas();
+
+  ppapi::HostResource image_data_resource;
+  image_data_resource.SetHostResource(pp_instance(), resource.get());
+  double timestamp = 0;
+  reply_context.params.set_result(PP_ERROR_FAILED);
+  host()->SendReply(
+      reply_context,
+      PpapiPluginMsg_VideoSource_GetFrameReply(image_data_resource, timestamp));
+  last_timestamp_ = timestamp;
+  return PP_OK_COMPLETIONPENDING;
+}
+
+int32_t PepperVideoSourceHost::OnHostMsgClose(HostMessageContext* context) {
+  // TODO() Close the video stream.
+  return PP_OK;
+}
+
+}  // namespace content