Add Pepper VideoReader and VideoWriter plumbing

ppapi/proxy/video_source_resource.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 "ppapi/proxy/video_source_resource.h"
+
+#include "base/bind.h"
+#include "ipc/ipc_message.h"
+#include "ppapi/c/pp_errors.h"
+#include "ppapi/c/private/pp_video_frame_private.h"
+#include "ppapi/proxy/ppapi_messages.h"
+#include "ppapi/shared_impl/array_writer.h"

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

this is not needed.

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

Done.

+#include "ppapi/shared_impl/ppapi_globals.h"
+#include "ppapi/shared_impl/resource_tracker.h"
+#include "ppapi/shared_impl/var.h"
+#include "ppapi/thunk/enter.h"
+
+using ppapi::thunk::EnterResourceNoLock;
+using ppapi::thunk::PPB_VideoSource_Private_API;
+
+namespace {

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

this is not needed.

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

Done.

+
+}  // namespace
+
+namespace ppapi {
+namespace proxy {
+
+VideoSourceResource::VideoSourceResource(
+    Connection connection,
+    PP_Instance instance)
+    : PluginResource(connection, instance) {
+  SendCreate(RENDERER, PpapiHostMsg_VideoSource_Create());
+}
+
+VideoSourceResource::~VideoSourceResource() {
+}
+
+PPB_VideoSource_Private_API*
+    VideoSourceResource::AsPPB_VideoSource_Private_API() {
+  return this;
+}
+
+int32_t VideoSourceResource::Open(
+    PP_Var stream_url,
+    scoped_refptr<TrackedCallback> callback) {
+  scoped_refptr<StringVar> stream_url_var = StringVar::FromPPVar(stream_url);
+  const uint32_t kMaxStreamIdSizeInBytes = 16384;
+  if (!stream_url_var ||
+      stream_url_var->value().size() > kMaxStreamIdSizeInBytes)
+    return PP_ERROR_BADARGUMENT;
+  Call<PpapiPluginMsg_VideoSource_OpenReply>(RENDERER,
+      PpapiHostMsg_VideoSource_Open(stream_url_var->value()),
+      base::Bind(&VideoSourceResource::OnPluginMsgOpenComplete, this,
+                 callback));
+  return PP_OK_COMPLETIONPENDING;
+}
+
+int32_t VideoSourceResource::GetFrame(
+    PP_VideoFrame_Private* frame,
+    scoped_refptr<TrackedCallback> callback) {
+  Call<PpapiPluginMsg_VideoSource_GetFrameReply>(RENDERER,
+      PpapiHostMsg_VideoSource_GetFrame(),
+      base::Bind(&VideoSourceResource::OnPluginMsgGetFrameComplete, this,
+                 callback, frame));
+  return PP_OK_COMPLETIONPENDING;
+}
+
+void VideoSourceResource::Close() {
+  Post(RENDERER, PpapiHostMsg_VideoSource_Close());
+}
+
+void VideoSourceResource::OnPluginMsgOpenComplete(
+    scoped_refptr<TrackedCallback> callback,
+    const ResourceMessageReplyParams& params) {
+  int32_t result = params.result();
+  callback->Run(result);
+}
+
+void VideoSourceResource::OnPluginMsgGetFrameComplete(
+    scoped_refptr<TrackedCallback> callback,
+    PP_VideoFrame_Private* frame,
+    const ResourceMessageReplyParams& params,
+    const HostResource& image_data,
+    double timestamp) {
+  int32_t result = params.result();

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

We need to test whether the callback is still pending. If it has been aborted,
|frame| can be invalid. The plugin may have released it.

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

Done. I redid the whole callback setup for both resource types.

+  if (result == PP_OK) {
+    frame->timestamp = static_cast<PP_TimeTicks>(timestamp);
+    frame->image_data = image_data.host_resource();
+  }
+
+  callback->Run(result);
+}
+
+}  // namespace proxy
+}  // namespace ppapi