[PPAPI] Implement media stream video track API

ppapi/proxy/video_frame_resource.cc

+// Copyright 2014 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_frame_resource.h"
+
+#include "ppapi/c/pp_bool.h"
+#include "ppapi/shared_impl/var.h"
+
+namespace ppapi {
+namespace proxy {
+
+VideoFrameResource::VideoFrameResource(PP_Instance instance,
+                                       int32_t index,
+                                       MediaStreamFrame* frame)
+    : Resource(OBJECT_IS_PROXY, instance),
+      index_(index),
+      frame_(frame) {
+  DCHECK_EQ(frame_->header.type, MediaStreamFrame::TYPE_VIDEO);
+}
+
+VideoFrameResource::~VideoFrameResource() {
+  CHECK(!frame_) << "An unused (or unrecycled) frame is destroyed.";
+}
+
+thunk::PPB_VideoFrame_API* VideoFrameResource::AsPPB_VideoFrame_API() {
+  return this;
+}
+
+PP_TimeDelta VideoFrameResource::GetTimestamp() {
+  if (!frame_) {
+    VLOG(1) << "Frame is invalid";
+    return 0.0;
+  }
+  return frame_->video.timestamp;
+}
+
+void VideoFrameResource::SetTimestamp(PP_TimeDelta timestamp) {
+  if (!frame_) {
+    VLOG(1) << "Frame is invalid";
+    return;
+  }
+  frame_->video.timestamp = timestamp;
+}
+
+PP_VideoFrame_Format VideoFrameResource::GetFormat() {
+  if (!frame_) {
+    VLOG(1) << "Frame is invalid";
+    return PP_VIDEOFRAME_FORMAT_UNKNOWN;
+  }
+  return frame_->video.format;
+}
+
+PP_Bool VideoFrameResource::GetSize(PP_Size* size) {
+  if (!frame_) {
+    VLOG(1) << "Frame is invalid";
+    return PP_FALSE;
+  }
+  *size = frame_->video.size;
+  return PP_TRUE;
+}
+
+void* VideoFrameResource::GetDataBuffer() {
+  if (!frame_) {
+    VLOG(1) << "Frame is invalid";
+    return NULL;
+  }
+  return frame_->video.data;
+}
+
+uint32_t VideoFrameResource::GetDataBufferSize() {
+  if (!frame_) {
+    VLOG(1) << "Frame is invalid";
+    return 0;
+  }
+  return frame_->video.data_size;
+}
+
+MediaStreamFrame* VideoFrameResource::GetFrameBuffer() {
+  return frame_;
+}
+
+int32_t VideoFrameResource::GetFrameBufferIndex() {
+  return index_;
+}
+
+void VideoFrameResource::Invalidate() {
+  DCHECK(frame_);
+  DCHECK_GE(index_, 0);
+  frame_ = NULL;
+  index_ = -1;
+}
+
+}  // namespace proxy
+}  // namespace ppapi