[WIP][PPAPI] Implement MediaStreamVideoTrackResource.

content/renderer/pepper/pepper_media_stream_video_track_host.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 "content/renderer/pepper/pepper_media_stream_video_track_host.h"
+
+#include "content/public/renderer/render_thread.h"
+#include "ppapi/c/pp_errors.h"
+#include "ppapi/c/ppb_video_frame.h"
+#include "ppapi/host/dispatch_host_message.h"
+#include "ppapi/host/ppapi_host.h"
+#include "ppapi/proxy/host_dispatcher.h"
+#include "ppapi/proxy/ppapi_messages.h"
+#include "ppapi/proxy/resource_message_params.h"
+#include "ppapi/shared_impl/video_frame.h"
+
+using media::VideoFrame;
+using ppapi::host::HostMessageContext;
+using ppapi::host::ReplyMessageContext;
+
+namespace {
+
+PP_VideoFrame_Format ToPpapiFormat(media::VideoFrame::Format format) {
+  switch (format) {
+  case media::VideoFrame::YV12:
+    return PP_VIDEOFRAME_FORMAT_YV12;
+  case media::VideoFrame::YV16:
+    return PP_VIDEOFRAME_FORMAT_YV16;
+  case media::VideoFrame::I420:
+    return PP_VIDEOFRAME_FORMAT_I420;
+  case media::VideoFrame::YV12A:
+    return PP_VIDEOFRAME_FORMAT_YV12A;
+  case media::VideoFrame::YV12J:
+    return PP_VIDEOFRAME_FORMAT_YV12J;
+  default:
+    DVLOG(1) << "Unsupported pixel format " << format;
+    return PP_VIDEOFRAME_FORMAT_UNKNOWN;
+  }
+}
+
+}  // namespace
+
+namespace content {
+
+PepperMediaStreamVideoTrackHost::PepperMediaStreamVideoTrackHost(
+    RendererPpapiHost* host,
+    PP_Instance instance,
+    PP_Resource resource,
+    const blink::WebMediaStreamTrack& track)
+    : PepperIOStreamHost(host, instance, resource, false),
+      track_(track),
+      frame_buffer_size_(2),
+      frame_format_(VideoFrame::UNKNOWN),
+      frame_data_size_(0),
+      slot_size_(0) {
+  DCHECK(!track_.isNull());
+}
+
+PepperMediaStreamVideoTrackHost::~PepperMediaStreamVideoTrackHost() {
+  MediaStreamVideoSink::RemoveFromVideoTrack(this, track_);
+}
+
+int32_t PepperMediaStreamVideoTrackHost::OnResourceMessageReceived(
+    const IPC::Message& msg,
+    HostMessageContext* context) {
+  IPC_BEGIN_MESSAGE_MAP(PepperMediaStreamVideoTrackHost, msg)
+    PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(
+        PpapiHostMsg_MediaStreamVideoTrack_StartCapture, OnHostMsgStartCapture)
+  IPC_END_MESSAGE_MAP()
+  return PepperIOStreamHost::OnResourceMessageReceived(msg, context);
+}
+
+void PepperMediaStreamVideoTrackHost::OnVideoFrame(
+    const scoped_refptr<VideoFrame>& frame) {
+  DCHECK(frame);
+  PP_VideoFrame_Format ppformat = ToPpapiFormat(frame->format());
+  if (ppformat == PP_VIDEOFRAME_FORMAT_UNKNOWN)
+    return;
+
+  if (frame_size_ != frame->coded_size() || frame_format_ != frame->format()) {
+    frame_size_ = frame->coded_size();
+    frame_format_ = frame->format();
+    AllocFrameBuffers();
+  }
+
+  ppapi::VideoFrame* ppframe = NULL;
+  if (Lock(reinterpret_cast<void**>(&ppframe), slot_size_) != PP_OK) {
+    return;
+  }
+
+  ppframe->timestamp = frame->GetTimestamp().InSecondsF();
+  ppframe->format = ppformat;
+  ppframe->size.width = frame->coded_size().width();
+  ppframe->size.height = frame->coded_size().height();
+  ppframe->data_size = frame_data_size_;
+
+  COMPILE_ASSERT(VideoFrame::kYPlane == 0, y_plane_should_be_0);
+  COMPILE_ASSERT(VideoFrame::kUPlane == 1, u_plane_should_be_1);
+  COMPILE_ASSERT(VideoFrame::kVPlane == 2, v_plane_should_be_2);
+
+  uint8_t* dst = ppframe->data;
+  for (size_t i = 0; i < VideoFrame::NumPlanes(frame->format()); ++i) {
+    const uint8_t* src = frame->data(i);
+    const size_t row_bytes = frame->row_bytes(i);
+    const size_t src_stride = frame->stride(i);
+    for (int j = 0; j < frame->rows(i); ++j) {
+      memcpy(dst, src, row_bytes);
+      dst += row_bytes;
+      src += src_stride;
+    }
+  }
+  Unlock(ppframe);
+}
+
+void PepperMediaStreamVideoTrackHost::DidConnectPendingHostToResource() {
+  MediaStreamVideoSink::AddToVideoTrack(this, track_);
+}
+
+int32_t PepperMediaStreamVideoTrackHost::OnHostMsgStartCapture(
+    HostMessageContext* context) {
+  MediaStreamVideoSink::AddToVideoTrack(this, track_);
+  return PP_OK;
+}
+
+void PepperMediaStreamVideoTrackHost::AllocFrameBuffers() {
+  frame_data_size_ = VideoFrame::AllocationSize(frame_format_, frame_size_);
+  slot_size_ = sizeof(ppapi::VideoFrame) + frame_data_size_;
+  InitSharedBufferAndNotifyPlugin(frame_buffer_size_ * slot_size_);
+}
+
+}  // namespace content