[PPAPI] API definition for video media stream artifacts

ppapi/cpp/media_stream_video_track.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/media_stream_video_track.h"
+
+#include "ppapi/c/pp_errors.h"
+#include "ppapi/c/ppb_media_stream_video_track.h"
+#include "ppapi/cpp/completion_callback.h"
+#include "ppapi/cpp/module_impl.h"
+#include "ppapi/cpp/var.h"
+#include "ppapi/cpp/video_frame.h"
+
+namespace pp {
+
+namespace {
+
+template <> const char* interface_name<PPB_MediaStreamVideoTrack_0_1>() {
+  return PPB_MEDIASTREAMVIDEOTRACK_INTERFACE_0_1;
+}
+
+}  // namespace
+
+MediaStreamVideoTrack::MediaStreamVideoTrack() {
+}
+
+MediaStreamVideoTrack::MediaStreamVideoTrack(
+    const MediaStreamVideoTrack& other) : Resource(other) {
+}
+
+MediaStreamVideoTrack::MediaStreamVideoTrack(const Resource& resource)

[yzshen1, 2013/12/27 17:40:08]

Do we need this method now that we already have the PassRef constructor?

Besides, please note that you don't check IsMediaStreamVideoTrack() for the
PassRef constructor. I think it is okay not to check, the outcome is all calls
to the underlying C API will fail afterwards.

[Peng, 2013/12/27 21:21:43]

This constructor is used for passing js obj to NaCl. In NaCl, the code looks
like:

+  pp::VarDictionary var_dictionary_message(var_message);
+  pp::Var var_track = var_dictionary_message.Get("track");
+  if (!var_track.is_resource())
+    return;
+
+  pp::Resource resource_track = pp::VarResource_Dev(var_track).AsResource();
+
+  video_track_ = pp::MediaStreamVideoTrack(resource_track);

As discussed it offline, we need keep this constructor, but change
PP_NOREACHED() to PP_DCHECK().

+    : Resource(resource) {
+  if (!IsMediaStreamVideoTrack(resource)) {
+    PP_NOTREACHED();
+  }
+}
+
+MediaStreamVideoTrack::MediaStreamVideoTrack(PassRef, PP_Resource resource)
+    : Resource(PASS_REF, resource) {
+}
+
+MediaStreamVideoTrack::~MediaStreamVideoTrack() {
+}
+
+int32_t MediaStreamVideoTrack::Configure(uint32_t frame_buffer_size) {
+  if (has_interface<PPB_MediaStreamVideoTrack_0_1>()) {
+    return get_interface<PPB_MediaStreamVideoTrack_0_1>()->Configure(
+        pp_resource(), frame_buffer_size);
+  }
+  return PP_ERROR_NOINTERFACE;
+}
+
+std::string MediaStreamVideoTrack::GetId() const {
+  if (has_interface<PPB_MediaStreamVideoTrack_0_1>()) {
+    pp::Var id(PASS_REF, get_interface<PPB_MediaStreamVideoTrack_0_1>()->GetId(
+        pp_resource()));
+    if (id.is_string())
+      return id.AsString();
+  }
+  return std::string();
+}
+
+bool MediaStreamVideoTrack::HasEnded() const {
+  if (has_interface<PPB_MediaStreamVideoTrack_0_1>()) {
+    return PP_ToBool(get_interface<PPB_MediaStreamVideoTrack_0_1>()->HasEnded(
+        pp_resource()));
+  }
+  return true;
+}
+
+int32_t MediaStreamVideoTrack::GetFrame(
+    const CompletionCallbackWithOutput<VideoFrame>& cc) {
+  if (has_interface<PPB_MediaStreamVideoTrack_0_1>()) {
+    return get_interface<PPB_MediaStreamVideoTrack_0_1>()->GetFrame(
+        pp_resource(), cc.output(), cc.pp_completion_callback());
+  }
+  return cc.MayForce(PP_ERROR_NOINTERFACE);
+}
+
+int32_t MediaStreamVideoTrack::RecycleFrame(const VideoFrame& frame) {
+  if (has_interface<PPB_MediaStreamVideoTrack_0_1>()) {
+    return get_interface<PPB_MediaStreamVideoTrack_0_1>()->RecycleFrame(
+        pp_resource(), frame.pp_resource());
+  }
+  return PP_ERROR_NOINTERFACE;
+}
+
+void MediaStreamVideoTrack::Close() {
+  if (has_interface<PPB_MediaStreamVideoTrack_0_1>())
+    get_interface<PPB_MediaStreamVideoTrack_0_1>()->Close(pp_resource());
+}
+
+bool MediaStreamVideoTrack::IsMediaStreamVideoTrack(const Resource& resource) {
+  if (has_interface<PPB_MediaStreamVideoTrack_0_1>()) {
+    return get_interface<PPB_MediaStreamVideoTrack_0_1>()->
+      IsMediaStreamVideoTrack(resource.pp_resource());

[yzshen1, 2013/12/27 17:40:08]

wrong indent.

[Peng, 2013/12/27 21:21:43]

Done. 

+  }
+  return false;
+}
+
+}  // namespace pp