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      1 /*
      2  * libjingle
      3  * Copyright 2012 Google Inc.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are met:
      7  *
      8  *  1. Redistributions of source code must retain the above copyright notice,
      9  *     this list of conditions and the following disclaimer.
     10  *  2. Redistributions in binary form must reproduce the above copyright notice,
     11  *     this list of conditions and the following disclaimer in the documentation
     12  *     and/or other materials provided with the distribution.
     13  *  3. The name of the author may not be used to endorse or promote products
     14  *     derived from this software without specific prior written permission.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
     17  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     18  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
     19  * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     20  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #include "talk/media/base/capturerenderadapter.h"
     29 
     30 #include "talk/media/base/videocapturer.h"
     31 #include "talk/media/base/videorenderer.h"
     32 #include "webrtc/base/logging.h"
     33 
     34 namespace cricket {
     35 
     36 CaptureRenderAdapter::CaptureRenderAdapter(VideoCapturer* video_capturer)
     37     : video_capturer_(video_capturer) {
     38 }
     39 
     40 CaptureRenderAdapter::~CaptureRenderAdapter() {
     41   // Since the signal we're connecting to is multi-threaded,
     42   // disconnect_all() will block until all calls are serviced, meaning any
     43   // outstanding calls to OnVideoFrame will be done when this is done, and no
     44   // more calls will be serviced by this.
     45   // We do this explicitly instead of just letting the has_slots<> destructor
     46   // take care of it because we need to do this *before* video_renderers_ is
     47   // cleared by the destructor; otherwise we could mess with it while
     48   // OnVideoFrame is running.
     49   // We *don't* take capture_crit_ here since it could deadlock with the lock
     50   // taken by the video frame signal.
     51   disconnect_all();
     52 }
     53 
     54 CaptureRenderAdapter* CaptureRenderAdapter::Create(
     55     VideoCapturer* video_capturer) {
     56   if (!video_capturer) {
     57     return NULL;
     58   }
     59   CaptureRenderAdapter* return_value = new CaptureRenderAdapter(video_capturer);
     60   return_value->Init();  // Can't fail.
     61   return return_value;
     62 }
     63 
     64 bool CaptureRenderAdapter::AddRenderer(VideoRenderer* video_renderer) {
     65   if (!video_renderer) {
     66     return false;
     67   }
     68   rtc::CritScope cs(&capture_crit_);
     69   if (IsRendererRegistered(*video_renderer)) {
     70     return false;
     71   }
     72   video_renderers_.push_back(VideoRendererInfo(video_renderer));
     73   return true;
     74 }
     75 
     76 bool CaptureRenderAdapter::RemoveRenderer(VideoRenderer* video_renderer) {
     77   if (!video_renderer) {
     78     return false;
     79   }
     80   rtc::CritScope cs(&capture_crit_);
     81   for (VideoRenderers::iterator iter = video_renderers_.begin();
     82        iter != video_renderers_.end(); ++iter) {
     83     if (video_renderer == iter->renderer) {
     84       video_renderers_.erase(iter);
     85       return true;
     86     }
     87   }
     88   return false;
     89 }
     90 
     91 void CaptureRenderAdapter::Init() {
     92   video_capturer_->SignalVideoFrame.connect(
     93       this,
     94       &CaptureRenderAdapter::OnVideoFrame);
     95 }
     96 
     97 void CaptureRenderAdapter::OnVideoFrame(VideoCapturer* capturer,
     98                                         const VideoFrame* video_frame) {
     99   rtc::CritScope cs(&capture_crit_);
    100   if (video_renderers_.empty()) {
    101     return;
    102   }
    103   MaybeSetRenderingSize(video_frame);
    104 
    105   for (VideoRenderers::iterator iter = video_renderers_.begin();
    106        iter != video_renderers_.end(); ++iter) {
    107     VideoRenderer* video_renderer = iter->renderer;
    108     video_renderer->RenderFrame(video_frame);
    109   }
    110 }
    111 
    112 // The renderer_crit_ lock needs to be taken when calling this function.
    113 void CaptureRenderAdapter::MaybeSetRenderingSize(const VideoFrame* frame) {
    114   for (VideoRenderers::iterator iter = video_renderers_.begin();
    115        iter != video_renderers_.end(); ++iter) {
    116     const bool new_resolution = iter->render_width != frame->GetWidth() ||
    117         iter->render_height != frame->GetHeight();
    118     if (new_resolution) {
    119       if (iter->renderer->SetSize(static_cast<int>(frame->GetWidth()),
    120                                   static_cast<int>(frame->GetHeight()), 0)) {
    121         iter->render_width = frame->GetWidth();
    122         iter->render_height = frame->GetHeight();
    123       } else {
    124         LOG(LS_ERROR) << "Captured frame size not supported by renderer: " <<
    125             frame->GetWidth() << " x " << frame->GetHeight();
    126       }
    127     }
    128   }
    129 }
    130 
    131 // The renderer_crit_ lock needs to be taken when calling this function.
    132 bool CaptureRenderAdapter::IsRendererRegistered(
    133     const VideoRenderer& video_renderer) const {
    134   for (VideoRenderers::const_iterator iter = video_renderers_.begin();
    135        iter != video_renderers_.end(); ++iter) {
    136     if (&video_renderer == iter->renderer) {
    137       return true;
    138     }
    139   }
    140   return false;
    141 }
    142 
    143 }  // namespace cricket
    144