Add PP_VideoFrame, PPB_VideoReader, and PPB_VideoWriter APIs to Pepper.

ppapi/cpp/video.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/cpp/video.h"
+
+#include "ppapi/c/pp_errors.h"
+#include "ppapi/c/ppb_var.h"
+#include "ppapi/c/ppb_video_reader.h"
+#include "ppapi/c/ppb_video_writer.h"
+#include "ppapi/cpp/completion_callback.h"
+#include "ppapi/cpp/image_data.h"
+#include "ppapi/cpp/instance_handle.h"
+#include "ppapi/cpp/module.h"
+#include "ppapi/cpp/module_impl.h"
+#include "ppapi/cpp/var.h"
+
+namespace pp {
+
+namespace {
+
+template <> const char* interface_name<PPB_VideoReader_1_0>() {
+  return PPB_VIDEOREADER_INTERFACE_1_0;
+}
+template <> const char* interface_name<PPB_VideoWriter_1_0>() {
+  return PPB_VIDEOWRITER_INTERFACE_1_0;
+}
+
+}  // namespace
+
+// VideoFrame ------------------------------------------------------------------
+
+VideoFrame::VideoFrame() {
+  video_frame_.image_data = image_data_.pp_resource();
+  set_timestamp(0);
+}
+
+VideoFrame::VideoFrame(
+    PassRef,
+    const PP_VideoFrame& pp_video_frame) {
+  video_frame_ = pp_video_frame;
+  image_data_ = ImageData(PASS_REF, pp_video_frame.image_data);
+}
+
+VideoFrame::VideoFrame(const VideoFrame& other) {
+  set_image_data(other.image_data());
+  set_timestamp(other.timestamp());
+}
+
+VideoFrame::~VideoFrame() {
+}
+
+VideoFrame& VideoFrame::operator=(const VideoFrame& other) {
+  if (this == &other)
+    return *this;
+
+  video_frame_ = other.video_frame_;
+  // Be careful about the refcount of the resource, the assignment above doesn't
+  // copy a ref. The assignments below take a ref to the new image data and copy
+  // the PP_Resource into the wrapped video frame.
+  image_data_ = other.image_data();
+  video_frame_.image_data = image_data_.pp_resource();

[yzshen1, 2013/04/02 19:28:39]

It seems line 62 is not needed because line 57 has done the work. Or we could
replace 57-62 using set_image_data() and set_timestamp().

[bbudge, 2013/04/03 10:42:29]

Done.

+
+  return *this;
+}
+
+// VideoReader -----------------------------------------------------------------
+
+VideoReader::VideoReader() {
+}
+
+VideoReader::VideoReader(const InstanceHandle& instance) {
+  if (!has_interface<PPB_VideoReader_1_0>())
+    return;
+  PassRefFromConstructor(get_interface<PPB_VideoReader_1_0>()->Create(
+      instance.pp_instance()));
+}
+
+VideoReader::VideoReader(const VideoReader& other)
+    : Resource(other) {
+}
+
+VideoReader::VideoReader(PassRef, PP_Resource resource)
+    : Resource(PASS_REF, resource) {
+}
+
+int32_t VideoReader::Open(const Var& stream_id,
+                          const CompletionCallback& cc) {
+  if (has_interface<PPB_VideoReader_1_0>()) {
+    int32_t result =
+        get_interface<PPB_VideoReader_1_0>()->Open(
+            pp_resource(),
+            stream_id.pp_var(), cc.pp_completion_callback());
+    return result;
+  }
+  return cc.MayForce(PP_ERROR_NOINTERFACE);
+}
+
+int32_t VideoReader::Close() {
+  if (has_interface<PPB_VideoReader_1_0>()) {
+    return get_interface<PPB_VideoReader_1_0>()->Close(pp_resource());
+  }
+  return PP_ERROR_NOINTERFACE;
+}
+
+int32_t VideoReader::GetNextFrame(
+    const CompletionCallbackWithOutput<VideoFrame>& cc) {
+  if (has_interface<PPB_VideoReader_1_0>()) {
+    return get_interface<PPB_VideoReader_1_0>()->GetNextFrame(
+        pp_resource(),
+        cc.output(), cc.pp_completion_callback());
+  }
+  return cc.MayForce(PP_ERROR_NOINTERFACE);
+}
+

[yzshen1, 2013/04/02 19:28:39]

The writer implementation is missing.

[bbudge, 2013/04/03 10:42:29]

Done.

+}  // namespace pp