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
CaptureRenderAdapter(VideoCapturer * video_capturer)37 CaptureRenderAdapter::CaptureRenderAdapter(VideoCapturer* video_capturer)
38 : video_capturer_(video_capturer) {
39 }
40
~CaptureRenderAdapter()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
Create(VideoCapturer * video_capturer)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
AddRenderer(VideoRenderer * video_renderer)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
RemoveRenderer(VideoRenderer * video_renderer)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
Init()92 void CaptureRenderAdapter::Init() {
93 video_capturer_->SignalVideoFrame.connect(
94 this,
95 &CaptureRenderAdapter::OnVideoFrame);
96 }
97
OnVideoFrame(VideoCapturer * capturer,const VideoFrame * video_frame)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.
MaybeSetRenderingSize(const VideoFrame * frame)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.
IsRendererRegistered(const VideoRenderer & video_renderer) const133 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