src/content/renderer/media/media_stream_source_observer.cc

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/renderer/media/media_stream_source_observer.h"
   6
   7 #include "base/logging.h"
   8 #include "content/renderer/media/media_stream_source_extra_data.h"
   9
  10 namespace content {
  11
  12 MediaStreamSourceObserver::MediaStreamSourceObserver(
  13     webrtc::MediaSourceInterface* webrtc_source,
  14     MediaStreamSourceExtraData* extra_data)
  15      : state_(webrtc_source->state()),
  16        webrtc_source_(webrtc_source),
  17        extra_data_(extra_data) {
  18   webrtc_source_->RegisterObserver(this);
  19 }
  20
  21 MediaStreamSourceObserver::~MediaStreamSourceObserver() {
  22   DCHECK(CalledOnValidThread());
  23   if (webrtc_source_.get())
  24     webrtc_source_->UnregisterObserver(this);
  25 }
  26
  27 void MediaStreamSourceObserver::OnChanged() {
  28   DCHECK(CalledOnValidThread());
  29   // There should be no more notification after kEnded.
  30   DCHECK(webrtc_source_.get() != NULL);
  31
  32   webrtc::MediaSourceInterface::SourceState state = webrtc_source_->state();
  33   if (state == state_)
  34     return;
  35   state_ = state;
  36   blink::WebMediaStreamSource webkit_source(extra_data_->owner());
  37
  38   switch (state) {
  39     case webrtc::MediaSourceInterface::kInitializing:
  40       // Ignore the kInitializing state since there is no match in
  41       // WebMediaStreamSource::ReadyState.
  42       break;
  43     case webrtc::MediaSourceInterface::kLive:
  44       webkit_source.setReadyState(
  45           blink::WebMediaStreamSource::ReadyStateLive);
  46       break;
  47     case webrtc::MediaSourceInterface::kMuted:
  48       webkit_source.setReadyState(
  49           blink::WebMediaStreamSource::ReadyStateMuted);
  50       break;
  51     case webrtc::MediaSourceInterface::kEnded:
  52       webkit_source.setReadyState(
  53           blink::WebMediaStreamSource::ReadyStateEnded);
  54       webrtc_source_->UnregisterObserver(this);
  55       webrtc_source_ = NULL;
  56       break;
  57     default:
  58       NOTREACHED();
  59       break;
  60   }
  61 }
  62
  63 }  // namespace content