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/base/logging.h"
31#include "talk/media/base/videocapturer.h"
32#include "talk/media/base/videoprocessor.h"
33#include "talk/media/base/videorenderer.h"
34
35namespace cricket {
36
37CaptureRenderAdapter::CaptureRenderAdapter(VideoCapturer* video_capturer)
38    : video_capturer_(video_capturer) {
39}
40
41CaptureRenderAdapter::~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
55CaptureRenderAdapter* 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
65bool CaptureRenderAdapter::AddRenderer(VideoRenderer* video_renderer) {
66  if (!video_renderer) {
67    return false;
68  }
69  talk_base::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
77bool CaptureRenderAdapter::RemoveRenderer(VideoRenderer* video_renderer) {
78  if (!video_renderer) {
79    return false;
80  }
81  talk_base::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
92void CaptureRenderAdapter::Init() {
93  video_capturer_->SignalVideoFrame.connect(
94      this,
95      &CaptureRenderAdapter::OnVideoFrame);
96}
97
98void CaptureRenderAdapter::OnVideoFrame(VideoCapturer* capturer,
99                                        const VideoFrame* video_frame) {
100  talk_base::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.
114void 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.
133bool 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