media_capture_util.cc revision 03b57e008b61dfcb1fbad3aea950ae0e001748b0 
1// Copyright 2014 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 "extensions/shell/browser/media_capture_util.h"
6
7#include "base/callback.h"
8#include "base/logging.h"
9#include "content/public/browser/media_capture_devices.h"
10#include "extensions/common/permissions/permissions_data.h"
11
12using content::MediaCaptureDevices;
13using content::MediaStreamDevices;
14using content::MediaStreamUI;
15
16namespace extensions {
17namespace media_capture_util {
18
19// See also Chrome's MediaCaptureDevicesDispatcher.
20void GrantMediaStreamRequestWithFirstDevice(
21    content::WebContents* web_contents,
22    const content::MediaStreamRequest& request,
23    const content::MediaResponseCallback& callback,
24    const Extension* extension) {
25  // app_shell only supports audio and video capture, not tab or screen capture.
26  DCHECK(request.audio_type == content::MEDIA_DEVICE_AUDIO_CAPTURE ||
27         request.video_type == content::MEDIA_DEVICE_VIDEO_CAPTURE);
28
29  // app_shell does not support requesting a specific device ID.
30  DCHECK(request.requested_audio_device_id.empty() &&
31         request.requested_video_device_id.empty());
32
33  MediaStreamDevices devices;
34  const PermissionsData* permissions_data = extension->permissions_data();
35
36  if (request.audio_type == content::MEDIA_DEVICE_AUDIO_CAPTURE) {
37    // app_shell has no UI surface to show an error, and on an embedded device
38    // it's better to crash than to have a feature not work.
39    CHECK(permissions_data->HasAPIPermission(APIPermission::kAudioCapture))
40        << "Audio capture request but no audioCapture permission in manifest.";
41
42    // Use first available audio capture device.
43    const MediaStreamDevices& audio_devices =
44        MediaCaptureDevices::GetInstance()->GetAudioCaptureDevices();
45    if (!audio_devices.empty())
46      devices.push_back(audio_devices[0]);
47  }
48
49  if (request.video_type == content::MEDIA_DEVICE_VIDEO_CAPTURE) {
50    // See APIPermission::kAudioCapture check above.
51    CHECK(permissions_data->HasAPIPermission(APIPermission::kVideoCapture))
52        << "Video capture request but no videoCapture permission in manifest.";
53
54    // Use first available video capture device.
55    const MediaStreamDevices& video_devices =
56        MediaCaptureDevices::GetInstance()->GetVideoCaptureDevices();
57    if (!video_devices.empty())
58      devices.push_back(video_devices[0]);
59  }
60
61  // TODO(jamescook): Should we show a recording icon somewhere? If so, where?
62  scoped_ptr<MediaStreamUI> ui;
63  callback.Run(devices,
64               devices.empty() ? content::MEDIA_DEVICE_INVALID_STATE
65                               : content::MEDIA_DEVICE_OK,
66               ui.Pass());
67}
68
69}  // namespace media_capture_util
70}  // namespace extensions
71