Add Pepper VideoReader and VideoWriter plumbing

ppapi/thunk/ppb_video_reader_thunk.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/c/pp_completion_callback.h"
+#include "ppapi/c/pp_errors.h"
+#include "ppapi/c/pp_video_frame.h"
+#include "ppapi/c/ppb_video_reader.h"
+#include "ppapi/shared_impl/tracked_callback.h"
+#include "ppapi/thunk/enter.h"
+#include "ppapi/thunk/ppb_video_reader_api.h"
+#include "ppapi/thunk/resource_creation_api.h"
+#include "ppapi/thunk/thunk.h"
+
+namespace ppapi {
+namespace thunk {
+
+namespace {
+
+PP_Resource Create(PP_Instance instance) {
+  EnterResourceCreation enter(instance);
+  if (enter.failed())
+    return 0;
+  return enter.functions()->CreateVideoReader(instance);
+}
+
+PP_Bool IsVideoReader(PP_Resource resource) {
+  EnterResource<PPB_VideoReader_API> enter(resource, false);
+  return PP_FromBool(enter.succeeded());
+}
+
+int32_t Open(PP_Resource reader,
+             PP_Var stream_id,
+             PP_CompletionCallback callback) {
+  EnterResource<PPB_VideoReader_API> enter(reader, callback, true);
+  if (enter.failed())
+    return enter.retval();
+  return enter.SetResult(enter.object()->Open(stream_id, enter.callback()));
+}
+
+int32_t GetFrame(PP_Resource reader,
+                 PP_VideoFrame* frame,
+                 PP_CompletionCallback callback) {
+  EnterResource<PPB_VideoReader_API> enter(reader, callback, true);
+  if (enter.failed())
+    return enter.retval();
+  return enter.SetResult(enter.object()->GetFrame(frame,
+                                                  enter.callback()));
+}
+
+void Close(PP_Resource reader) {
+  EnterResource<PPB_VideoReader_API> enter(reader, true);
+  if (enter.succeeded())
+    enter.object()->Close();
+}
+
+const PPB_VideoReader_0_1 g_ppb_video_reader_thunk_0_1 = {
+  &Create,
+  &IsVideoReader,
+  &Open,
+  &GetFrame,
+  &Close
+};
+
+}  // namespace
+
+const PPB_VideoReader_0_1* GetPPB_VideoReader_0_1_Thunk() {
+  return &g_ppb_video_reader_thunk_0_1;
+}
+
+}  // namespace thunk
+}  // namespace ppapi