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      1 /*
      2  * libjingle
      3  * Copyright 2015 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/app/webrtc/rtpreceiver.h"
     29 
     30 #include "talk/app/webrtc/videosourceinterface.h"
     31 
     32 namespace webrtc {
     33 
     34 AudioRtpReceiver::AudioRtpReceiver(AudioTrackInterface* track,
     35                                    uint32_t ssrc,
     36                                    AudioProviderInterface* provider)
     37     : id_(track->id()),
     38       track_(track),
     39       ssrc_(ssrc),
     40       provider_(provider),
     41       cached_track_enabled_(track->enabled()) {
     42   RTC_DCHECK(track_->GetSource()->remote());
     43   track_->RegisterObserver(this);
     44   track_->GetSource()->RegisterAudioObserver(this);
     45   Reconfigure();
     46 }
     47 
     48 AudioRtpReceiver::~AudioRtpReceiver() {
     49   track_->GetSource()->UnregisterAudioObserver(this);
     50   track_->UnregisterObserver(this);
     51   Stop();
     52 }
     53 
     54 void AudioRtpReceiver::OnChanged() {
     55   if (cached_track_enabled_ != track_->enabled()) {
     56     cached_track_enabled_ = track_->enabled();
     57     Reconfigure();
     58   }
     59 }
     60 
     61 void AudioRtpReceiver::OnSetVolume(double volume) {
     62   // When the track is disabled, the volume of the source, which is the
     63   // corresponding WebRtc Voice Engine channel will be 0. So we do not allow
     64   // setting the volume to the source when the track is disabled.
     65   if (provider_ && track_->enabled())
     66     provider_->SetAudioPlayoutVolume(ssrc_, volume);
     67 }
     68 
     69 void AudioRtpReceiver::Stop() {
     70   // TODO(deadbeef): Need to do more here to fully stop receiving packets.
     71   if (!provider_) {
     72     return;
     73   }
     74   provider_->SetAudioPlayout(ssrc_, false);
     75   provider_ = nullptr;
     76 }
     77 
     78 void AudioRtpReceiver::Reconfigure() {
     79   if (!provider_) {
     80     return;
     81   }
     82   provider_->SetAudioPlayout(ssrc_, track_->enabled());
     83 }
     84 
     85 VideoRtpReceiver::VideoRtpReceiver(VideoTrackInterface* track,
     86                                    uint32_t ssrc,
     87                                    VideoProviderInterface* provider)
     88     : id_(track->id()), track_(track), ssrc_(ssrc), provider_(provider) {
     89   RTC_DCHECK(track_->GetSource()->remote());
     90   provider_->SetVideoPlayout(ssrc_, true, track_->GetSource()->FrameInput());
     91 }
     92 
     93 VideoRtpReceiver::~VideoRtpReceiver() {
     94   // Since cricket::VideoRenderer is not reference counted,
     95   // we need to remove it from the provider before we are deleted.
     96   Stop();
     97 }
     98 
     99 void VideoRtpReceiver::Stop() {
    100   // TODO(deadbeef): Need to do more here to fully stop receiving packets.
    101   if (!provider_) {
    102     return;
    103   }
    104   provider_->SetVideoPlayout(ssrc_, false, nullptr);
    105   provider_ = nullptr;
    106 }
    107 
    108 }  // namespace webrtc
    109