[PPAPI] Implement media stream video track API

ppapi/proxy/media_stream_track_resource_base.cc

+// Copyright (c) 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/media_stream_track_resource_base.h"
+
+#include "ppapi/proxy/ppapi_messages.h"
+
+namespace ppapi {
+namespace proxy {
+
+MediaStreamTrackResourceBase::MediaStreamTrackResourceBase(
+    Connection connection,
+    PP_Instance instance,
+    int pending_renderer_id,
+    const std::string& id)
+    : PluginResource(connection, instance),
+      frame_buffer_(this),
+      id_(id),
+      has_ended_(false) {
+  AttachToPendingHost(RENDERER, pending_renderer_id);
+}
+
+MediaStreamTrackResourceBase::~MediaStreamTrackResourceBase() {
+}
+
+void MediaStreamTrackResourceBase::SendEnqueueFrameMessageToHost(
+    int32_t index) {
+  DCHECK_GE(index, 0);
+  DCHECK_LT(index, frame_buffer()->number_of_frames());
+  Post(RENDERER, PpapiHostMsg_MediaStreamTrack_EnqueueFrame(index));
+}
+
+void MediaStreamTrackResourceBase::OnReplyReceived(
+    const ResourceMessageReplyParams& params,
+    const IPC::Message& msg) {
+  IPC_BEGIN_MESSAGE_MAP(MediaStreamTrackResourceBase, msg)
+    PPAPI_DISPATCH_PLUGIN_RESOURCE_CALL(
+        PpapiPluginMsg_MediaStreamTrack_InitFrames, OnPluginMsgInitFrames)
+    PPAPI_DISPATCH_PLUGIN_RESOURCE_CALL(
+        PpapiPluginMsg_MediaStreamTrack_EnqueueFrame, OnPluginMsgEnqueueFrame)
+    PPAPI_DISPATCH_PLUGIN_RESOURCE_CALL_UNHANDLED(
+        PluginResource::OnReplyReceived(params, msg))
+  IPC_END_MESSAGE_MAP()
+}
+
+void MediaStreamTrackResourceBase::CloseInternal() {
+  if (!has_ended_) {
+    Post(RENDERER, PpapiHostMsg_MediaStreamTrack_Close());
+    has_ended_ = true;
+  }
+}
+
+void MediaStreamTrackResourceBase::OnPluginMsgInitFrames(
+    const ResourceMessageReplyParams& params,
+    int32_t number_of_frames,
+    int32_t frame_size) {
+  base::SharedMemoryHandle shm_handle = base::SharedMemory::NULLHandle();
+  params.TakeSharedMemoryHandleAtIndex(0, &shm_handle);
+  frame_buffer_.SetFrames(number_of_frames, frame_size,
+      scoped_ptr<base::SharedMemory>(new base::SharedMemory(shm_handle, true)),
+      false);
+}
+
+void MediaStreamTrackResourceBase::OnPluginMsgEnqueueFrame(
+    const ResourceMessageReplyParams& params,
+    int32_t index) {
+  frame_buffer_.EnqueueFrame(index);
+}
+
+}  // namespace proxy
+}  // namespace ppapi