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
34namespace cricket {
35
36CaptureRenderAdapter::CaptureRenderAdapter(VideoCapturer* video_capturer)
37    : video_capturer_(video_capturer) {
38}
39
40CaptureRenderAdapter::~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
54CaptureRenderAdapter* 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
64bool 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
76bool 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
91void CaptureRenderAdapter::Init() {
92  video_capturer_->SignalVideoFrame.connect(
93      this,
94      &CaptureRenderAdapter::OnVideoFrame);
95}
96
97void 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.
113void 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.
132bool 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