1 files changed, 129 insertions, 0 deletions
diff --git a/content/public/renderer/media_stream_utils.cc b/content/public/renderer/media_stream_utils.cc
new file mode 100644
index 0000000..d486541
--- /dev/null
+++ b/content/public/renderer/media_stream_utils.cc
@@ -0,0 +1,129 @@
+// 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_utils.h"
+
+#include <utility>
+
+#include "base/callback.h"
+#include "base/guid.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/rand_util.h"
+#include "base/strings/utf_string_conversions.h"
+#include "content/renderer/media/media_stream_audio_source.h"
+#include "content/renderer/media/media_stream_video_capturer_source.h"
+#include "content/renderer/media/media_stream_video_source.h"
+#include "content/renderer/media/media_stream_video_track.h"
+#include "content/renderer/render_thread_impl.h"
+#include "media/base/audio_capturer_source.h"
+#include "media/base/video_capturer_source.h"
+#include "third_party/WebKit/public/platform/WebMediaStream.h"
+#include "third_party/WebKit/public/platform/WebMediaStreamSource.h"
+#include "third_party/WebKit/public/web/WebMediaStreamRegistry.h"
+
+namespace content {
+
+bool AddVideoTrackToMediaStream(
+    scoped_ptr<media::VideoCapturerSource> video_source,
+    bool is_remote,
+    bool is_readonly,
+    blink::WebMediaStream* web_media_stream) {
+  DCHECK(video_source.get());
+  if (!web_media_stream || web_media_stream->isNull()) {
+    DLOG(ERROR) << "WebMediaStream is null";
+    return false;
+  }
+
+  blink::WebMediaStreamSource web_media_stream_source;
+  MediaStreamVideoSource* const media_stream_source =
+      new MediaStreamVideoCapturerSource(
+          MediaStreamSource::SourceStoppedCallback(), std::move(video_source));
+  const blink::WebString track_id =
+      blink::WebString::fromUTF8(base::GenerateGUID());
+  web_media_stream_source.initialize(track_id,
+                                     blink::WebMediaStreamSource::TypeVideo,
+                                     track_id, is_remote, is_readonly);
+  // Takes ownership of |media_stream_source|.
+  web_media_stream_source.setExtraData(media_stream_source);
+
+  blink::WebMediaConstraints constraints;
+  constraints.initialize();
+  web_media_stream->addTrack(MediaStreamVideoTrack::CreateVideoTrack(
+      media_stream_source, constraints,
+      MediaStreamVideoSource::ConstraintsCallback(), true));
+  return true;
+}
+
+bool AddAudioTrackToMediaStream(
+    scoped_refptr<media::AudioCapturerSource> audio_source,
+    int sample_rate,
+    media::ChannelLayout channel_layout,
+    int frames_per_buffer,
+    bool is_remote,
+    bool is_readonly,
+    blink::WebMediaStream* web_media_stream) {
+  DCHECK(audio_source.get());
+  if (!web_media_stream || web_media_stream->isNull()) {
+    DLOG(ERROR) << "WebMediaStream is null";
+    return false;
+  }
+
+  const media::AudioParameters params(
+      media::AudioParameters::AUDIO_PCM_LOW_LATENCY, channel_layout,
+      sample_rate, sizeof(int16_t) * 8, frames_per_buffer);
+  if (!params.IsValid()) {
+    DLOG(ERROR) << "Invalid audio parameters.";
+    return false;
+  }
+
+  blink::WebMediaStreamSource web_media_stream_source;
+  const blink::WebString track_id =
+      blink::WebString::fromUTF8(base::GenerateGUID());
+  web_media_stream_source.initialize(track_id,
+                                     blink::WebMediaStreamSource::TypeAudio,
+                                     track_id, is_remote, is_readonly);
+
+  MediaStreamAudioSource* media_stream_source(new MediaStreamAudioSource(
+      -1, StreamDeviceInfo(), MediaStreamSource::SourceStoppedCallback(),
+      RenderThreadImpl::current()->GetPeerConnectionDependencyFactory()));
+
+  blink::WebMediaConstraints constraints;
+  constraints.initialize();
+  {
+    // TODO(miu): In an upcoming change, a source purposed for passing audio
+    // directly (i.e., without modification) will replace this "hacky" use of
+    // WebRtcAudioCapturer.  http://crbug.com/577881
+    scoped_ptr<WebRtcAudioCapturer> capturer(
+        WebRtcAudioCapturer::CreateCapturer(-1, StreamDeviceInfo(), constraints,
+                                            nullptr, media_stream_source));
+    capturer->SetCapturerSource(std::move(audio_source), params);
+    media_stream_source->SetAudioCapturer(std::move(capturer));
+  }
+  web_media_stream_source.setExtraData(
+      media_stream_source);  // Takes ownership.
+
+  blink::WebMediaStreamTrack web_media_stream_track;
+  web_media_stream_track.initialize(web_media_stream_source);
+  RenderThreadImpl::current()
+      ->GetPeerConnectionDependencyFactory()
+      ->CreateLocalAudioTrack(web_media_stream_track);
+
+  web_media_stream->addTrack(web_media_stream_track);
+  return true;
+}
+
+const media::VideoCaptureFormat* GetCurrentVideoTrackFormat(
+    const blink::WebMediaStreamTrack& video_track) {
+  if (video_track.isNull())
+    return nullptr;
+
+  content::MediaStreamVideoSource* source =
+      content::MediaStreamVideoSource::GetVideoSource(video_track.source());
+  if (!source)
+    return nullptr;
+
+  return source->GetCurrentFormat();
+}
+
+}  // namespace content