MediaStream audio sourcing: Bypass audio processing for non-WebRTC cases.

content/public/renderer/media_stream_api.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/public/renderer/media_stream_api.h"
 
 #include <utility>
 
 #include "base/base64.h"
+#include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/rand_util.h"
 #include "base/strings/utf_string_conversions.h"
-#include "content/renderer/media/media_stream_audio_source.h"
+#include "content/common/media/media_stream_options.h"
+#include "content/renderer/media/external_media_stream_audio_source.h"
 #include "content/renderer/media/media_stream_video_capturer_source.h"
 #include "content/renderer/media/media_stream_video_track.h"
-#include "content/renderer/render_thread_impl.h"
 #include "third_party/WebKit/public/platform/WebMediaStream.h"
 #include "third_party/WebKit/public/platform/WebMediaStreamSource.h"
-#include "third_party/WebKit/public/platform/WebURL.h"
-#include "third_party/WebKit/public/web/WebMediaStreamRegistry.h"
-#include "url/gurl.h"
+#include "third_party/WebKit/public/platform/WebMediaStreamTrack.h"
 
 namespace content {
 
 namespace {
 
 blink::WebString MakeTrackId() {
   std::string track_id;
   base::Base64Encode(base::RandBytesAsString(64), &track_id);
   return base::UTF8ToUTF16(track_id);
 }
 
 }  // namespace
 
 bool AddVideoTrackToMediaStream(scoped_ptr<media::VideoCapturerSource> source,
                                 bool is_remote,
                                 bool is_readonly,
-                                const std::string& media_stream_url) {
-  blink::WebMediaStream web_stream =
-      blink::WebMediaStreamRegistry::lookupMediaStreamDescriptor(
-          GURL(media_stream_url));
-  return AddVideoTrackToMediaStream(std::move(source), is_remote, is_readonly,
-                                    &web_stream);
-}
-
-bool AddVideoTrackToMediaStream(scoped_ptr<media::VideoCapturerSource> source,
-                                bool is_remote,
-                                bool is_readonly,
                                 blink::WebMediaStream* web_stream) {
-  if (web_stream->isNull()) {
-    DLOG(ERROR) << "Stream not found";
-    return false;
-  }
+  DCHECK(source.get());
+  DCHECK(web_stream);
+  DCHECK(!web_stream->isNull());
+
   const blink::WebString track_id = MakeTrackId();
   blink::WebMediaStreamSource webkit_source;
-  scoped_ptr<MediaStreamVideoSource> media_stream_source(
+  MediaStreamVideoSource* const media_stream_source =
       new MediaStreamVideoCapturerSource(
-          MediaStreamSource::SourceStoppedCallback(), std::move(source)));
+          MediaStreamSource::SourceStoppedCallback(), std::move(source));
   webkit_source.initialize(track_id, blink::WebMediaStreamSource::TypeVideo,
                            track_id, is_remote, is_readonly);
-  webkit_source.setExtraData(media_stream_source.get());
+  // Takes ownership of |media_stream_source|.
+  webkit_source.setExtraData(media_stream_source);
 
   blink::WebMediaConstraints constraints;
   constraints.initialize();
   web_stream->addTrack(MediaStreamVideoTrack::CreateVideoTrack(
-      media_stream_source.release(), constraints,
+      media_stream_source, constraints,
       MediaStreamVideoSource::ConstraintsCallback(), true));
   return true;
 }
 
 bool AddAudioTrackToMediaStream(
     const scoped_refptr<media::AudioCapturerSource>& source,
-    const media::AudioParameters& params,
-    bool is_remote,
-    bool is_readonly,
-    const std::string& media_stream_url) {
-  DCHECK(params.IsValid()) << params.AsHumanReadableString();
-  blink::WebMediaStream web_stream =
-      blink::WebMediaStreamRegistry::lookupMediaStreamDescriptor(
-          GURL(media_stream_url));
-  return AddAudioTrackToMediaStream(source,
-                                    is_remote, is_readonly, &web_stream);
-}
-
-bool AddAudioTrackToMediaStream(
-    const scoped_refptr<media::AudioCapturerSource>& source,
+    int sample_rate,
+    media::ChannelLayout channel_layout,
+    int frames_per_buffer,
     bool is_remote,
     bool is_readonly,
     blink::WebMediaStream* web_stream) {
-  if (web_stream->isNull()) {
-    DLOG(ERROR) << "Stream not found";
+  DCHECK(source.get());
+  DCHECK(web_stream);
+  DCHECK(!web_stream->isNull());
+
+  // Create Blink and Chromium objects to represent the MediaStreamSource.
+  blink::WebMediaStreamSource web_source;
+  const blink::WebString track_id = MakeTrackId();
+  web_source.initialize(track_id, blink::WebMediaStreamSource::TypeAudio,
+                        track_id, is_remote, is_readonly);
+  MediaStreamAudioSource* const audio_source =
+      new ExternalMediaStreamAudioSource(
+          source, sample_rate, channel_layout, frames_per_buffer, is_remote);
+  web_source.setExtraData(audio_source);  // Takes ownership of |audio_source|.
+
+  // Create the Blink and Chromium objects to represent the MediaStreamTrack,
+  // and connect the audio source to the track.
+  blink::WebMediaStreamTrack web_track;
+  web_track.initialize(web_source);
+  if (!audio_source->ConnectToTrack(web_track))
     return false;
-  }
 
-  media::AudioParameters params(
-      media::AudioParameters::AUDIO_PCM_LINEAR, media::CHANNEL_LAYOUT_STEREO,
-      48000, /* sample rate */
-      16,    /* bits per sample */
-      480);  /* frames per buffer */
-
-  blink::WebMediaStreamSource webkit_source;
-  const blink::WebString track_id = MakeTrackId();
-  webkit_source.initialize(track_id,
-                           blink::WebMediaStreamSource::TypeAudio,
-                           track_id,
-                           is_remote,
-                           is_readonly);
-
-  MediaStreamAudioSource* audio_source(
-      new MediaStreamAudioSource(
-          -1,
-          StreamDeviceInfo(),
-          MediaStreamSource::SourceStoppedCallback(),
-          RenderThreadImpl::current()->GetPeerConnectionDependencyFactory()));
-
-  blink::WebMediaConstraints constraints;
-  constraints.initialize();
-  scoped_refptr<WebRtcAudioCapturer> capturer(
-      WebRtcAudioCapturer::CreateCapturer(-1, StreamDeviceInfo(), constraints,
-                                          nullptr, audio_source));
-  capturer->SetCapturerSource(source, params);
-  audio_source->SetAudioCapturer(capturer);
-  webkit_source.setExtraData(audio_source);
-
-  blink::WebMediaStreamTrack web_media_audio_track;
-  web_media_audio_track.initialize(webkit_source);
-  RenderThreadImpl::current()->GetPeerConnectionDependencyFactory()->
-      CreateLocalAudioTrack(web_media_audio_track);
-
-  web_stream->addTrack(web_media_audio_track);
+  // Add the MediaStreamTrack to the MediaStream.
+  web_stream->addTrack(web_track);
   return true;
 }
 
 }  // namespace content