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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/videoprocessor.h"
     32 #include "talk/media/base/videorenderer.h"
     33 #include "webrtc/base/logging.h"
     34 
     35 namespace cricket {
     36 
     37 CaptureRenderAdapter::CaptureRenderAdapter(VideoCapturer* video_capturer)
     38     : video_capturer_(video_capturer) {
     39 }
     40 
     41 CaptureRenderAdapter::~CaptureRenderAdapter() {
     42   // Since the signal we're connecting to is multi-threaded,
     43   // disconnect_all() will block until all calls are serviced, meaning any
     44   // outstanding calls to OnVideoFrame will be done when this is done, and no
     45   // more calls will be serviced by this.
     46   // We do this explicitly instead of just letting the has_slots<> destructor
     47   // take care of it because we need to do this *before* video_renderers_ is
     48   // cleared by the destructor; otherwise we could mess with it while
     49   // OnVideoFrame is running.
     50   // We *don't* take capture_crit_ here since it could deadlock with the lock
     51   // taken by the video frame signal.
     52   disconnect_all();
     53 }
     54 
     55 CaptureRenderAdapter* CaptureRenderAdapter::Create(
     56     VideoCapturer* video_capturer) {
     57   if (!video_capturer) {
     58     return NULL;
     59   }
     60   CaptureRenderAdapter* return_value = new CaptureRenderAdapter(video_capturer);
     61   return_value->Init();  // Can't fail.
     62   return return_value;
     63 }
     64 
     65 bool CaptureRenderAdapter::AddRenderer(VideoRenderer* video_renderer) {
     66   if (!video_renderer) {
     67     return false;
     68   }
     69   rtc::CritScope cs(&capture_crit_);
     70   if (IsRendererRegistered(*video_renderer)) {
     71     return false;
     72   }
     73   video_renderers_.push_back(VideoRendererInfo(video_renderer));
     74   return true;
     75 }
     76 
     77 bool CaptureRenderAdapter::RemoveRenderer(VideoRenderer* video_renderer) {
     78   if (!video_renderer) {
     79     return false;
     80   }
     81   rtc::CritScope cs(&capture_crit_);
     82   for (VideoRenderers::iterator iter = video_renderers_.begin();
     83        iter != video_renderers_.end(); ++iter) {
     84     if (video_renderer == iter->renderer) {
     85       video_renderers_.erase(iter);
     86       return true;
     87     }
     88   }
     89   return false;
     90 }
     91 
     92 void CaptureRenderAdapter::Init() {
     93   video_capturer_->SignalVideoFrame.connect(
     94       this,
     95       &CaptureRenderAdapter::OnVideoFrame);
     96 }
     97 
     98 void CaptureRenderAdapter::OnVideoFrame(VideoCapturer* capturer,
     99                                         const VideoFrame* video_frame) {
    100   rtc::CritScope cs(&capture_crit_);
    101   if (video_renderers_.empty()) {
    102     return;
    103   }
    104   MaybeSetRenderingSize(video_frame);
    105 
    106   for (VideoRenderers::iterator iter = video_renderers_.begin();
    107        iter != video_renderers_.end(); ++iter) {
    108     VideoRenderer* video_renderer = iter->renderer;
    109     video_renderer->RenderFrame(video_frame);
    110   }
    111 }
    112 
    113 // The renderer_crit_ lock needs to be taken when calling this function.
    114 void CaptureRenderAdapter::MaybeSetRenderingSize(const VideoFrame* frame) {
    115   for (VideoRenderers::iterator iter = video_renderers_.begin();
    116        iter != video_renderers_.end(); ++iter) {
    117     const bool new_resolution = iter->render_width != frame->GetWidth() ||
    118         iter->render_height != frame->GetHeight();
    119     if (new_resolution) {
    120       if (iter->renderer->SetSize(static_cast<int>(frame->GetWidth()),
    121                                   static_cast<int>(frame->GetHeight()), 0)) {
    122         iter->render_width = frame->GetWidth();
    123         iter->render_height = frame->GetHeight();
    124       } else {
    125         LOG(LS_ERROR) << "Captured frame size not supported by renderer: " <<
    126             frame->GetWidth() << " x " << frame->GetHeight();
    127       }
    128     }
    129   }
    130 }
    131 
    132 // The renderer_crit_ lock needs to be taken when calling this function.
    133 bool CaptureRenderAdapter::IsRendererRegistered(
    134     const VideoRenderer& video_renderer) const {
    135   for (VideoRenderers::const_iterator iter = video_renderers_.begin();
    136        iter != video_renderers_.end(); ++iter) {
    137     if (&video_renderer == iter->renderer) {
    138       return true;
    139     }
    140   }
    141   return false;
    142 }
    143 
    144 }  // namespace cricket
    145