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/ppapi_globals.h"
+#include "ppapi/shared_impl/resource_tracker.h"
+#include "ppapi/thunk/enter.h"
+
+using ppapi::thunk::EnterResourceNoLock;
+using ppapi::thunk::PPB_VideoSource_Private_API;
+
+namespace ppapi {
+namespace proxy {
+
+VideoSourceResource::VideoSourceResource(
+    Connection connection,
+    PP_Instance instance)
+    : PluginResource(connection, instance),
+      is_open_(false) {
+  SendCreate(RENDERER, PpapiHostMsg_VideoSource_Create());
+}
+
+VideoSourceResource::~VideoSourceResource() {
+}
+
+PPB_VideoSource_Private_API*
+    VideoSourceResource::AsPPB_VideoSource_Private_API() {
+  return this;
+}
+
+int32_t VideoSourceResource::Open(
+    const PP_Var& stream_url,
+    scoped_refptr<TrackedCallback> callback) {
+  if (TrackedCallback::IsPending(open_callback_))
+    return PP_ERROR_INPROGRESS;
+
+  open_callback_ = 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));
+  return PP_OK_COMPLETIONPENDING;
+}
+
+int32_t VideoSourceResource::GetFrame(
+    PP_VideoFrame_Private* frame,
+    scoped_refptr<TrackedCallback> callback) {
+  if (!is_open_)
+    return PP_ERROR_FAILED;
+
+  if (TrackedCallback::IsPending(get_frame_callback_))
+    return PP_ERROR_INPROGRESS;
+
+  get_frame_callback_ = callback;
+
+  Call<PpapiPluginMsg_VideoSource_GetFrameReply>(RENDERER,
+      PpapiHostMsg_VideoSource_GetFrame(),
+      base::Bind(&VideoSourceResource::OnPluginMsgGetFrameComplete, this,
+                 frame));
+  return PP_OK_COMPLETIONPENDING;
+}
+
+void VideoSourceResource::Close() {
+  Post(RENDERER, PpapiHostMsg_VideoSource_Close());
+
+  if (TrackedCallback::IsPending(open_callback_))
+    open_callback_->PostAbort();
+  if (TrackedCallback::IsPending(get_frame_callback_))
+    get_frame_callback_->PostAbort();
+}
+
+void VideoSourceResource::OnPluginMsgOpenComplete(
+    const ResourceMessageReplyParams& params) {
+  is_open_ = true;

[yzshen1, 2013/05/02 22:03:05]

It seems better to set is_open_ to true only if the open operation is
successful.

[bbudge, 2013/05/02 23:12:19]

Done.

+  if (TrackedCallback::IsPending(open_callback_))
+    open_callback_->Run(params.result());
+}
+
+void VideoSourceResource::OnPluginMsgGetFrameComplete(
+    PP_VideoFrame_Private* frame,
+    const ResourceMessageReplyParams& params,
+    const HostResource& image_data,
+    PP_TimeTicks timestamp) {
+  // The callback may have been aborted by Close().
+  if (TrackedCallback::IsPending(get_frame_callback_)) {
+    int32_t result = params.result();
+    if (result == PP_OK) {
+      frame->timestamp = timestamp;
+      frame->image_data = image_data.host_resource();
+    }
+
+    get_frame_callback_->Run(result);
+  }
+}
+
+}  // namespace proxy
+}  // namespace ppapi