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
CaptureRenderAdapter(VideoCapturer * video_capturer)36 CaptureRenderAdapter::CaptureRenderAdapter(VideoCapturer* video_capturer)
37 : video_capturer_(video_capturer) {
38 }
39
~CaptureRenderAdapter()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
Create(VideoCapturer * video_capturer)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
AddRenderer(VideoRenderer * video_renderer)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
RemoveRenderer(VideoRenderer * video_renderer)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
Init()91 void CaptureRenderAdapter::Init() {
92 video_capturer_->SignalVideoFrame.connect(
93 this,
94 &CaptureRenderAdapter::OnVideoFrame);
95 }
96
OnVideoFrame(VideoCapturer * capturer,const VideoFrame * video_frame)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.
MaybeSetRenderingSize(const VideoFrame * frame)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.
IsRendererRegistered(const VideoRenderer & video_renderer) const132 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