【WebRTC---序篇】（二十）视频渲染

两个关键点

Main_wnd中的OnFrame(...)获取视频帧

void MainWnd::VideoRenderer::OnFrame(const webrtc::VideoFrame& video_frame) {
  {
    AutoLock<VideoRenderer> lock(this);

    rtc::scoped_refptr<webrtc::I420BufferInterface> buffer(
        video_frame.video_frame_buffer()->ToI420());
    if (video_frame.rotation() != webrtc::kVideoRotation_0) {
      buffer = webrtc::I420Buffer::Rotate(*buffer, video_frame.rotation());
    }

    SetSize(buffer->width(), buffer->height());
    //YUV格式转RGB
    RTC_DCHECK(image_.get() != NULL);
    libyuv::I420ToARGB(buffer->DataY(), buffer->StrideY(), buffer->DataU(),
                       buffer->StrideU(), buffer->DataV(), buffer->StrideV(),
                       image_.get(),
                       bmi_.bmiHeader.biWidth * bmi_.bmiHeader.biBitCount / 8,
                       buffer->width(), buffer->height());
  }//