1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
|
// Copyright (c) 2012 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 "build/build_config.h"
#include "media/base/media_switches.h"
namespace switches {
// Allow users to specify a custom buffer size for debugging purpose.
const char kAudioBufferSize[] = "audio-buffer-size";
// Set number of threads to use for video decoding.
const char kVideoThreads[] = "video-threads";
// Suspend media pipeline on background tabs.
const char kEnableMediaSuspend[] = "enable-media-suspend";
const char kDisableMediaSuspend[] = "disable-media-suspend";
#if defined(OS_ANDROID)
// Sets the MediaSource player that uses UI thread for frame processing.
const char kDisableMediaThreadForMediaPlayback[] =
"disable-media-thread-for-media-playback";
// Sets the MediaSource player that uses the separate media thread
const char kEnableMediaThreadForMediaPlayback[] =
"enable-media-thread-for-media-playback";
// Use WebMediaPlayerImpl instead of WebMediaPlayerAndroid. This is a temporary
// switch for experimenting with unifying the Android playback pipeline.
const char kEnableUnifiedMediaPipeline[] = "enable-unified-media-pipeline";
#endif
#if defined(OS_LINUX) || defined(OS_FREEBSD) || defined(OS_SOLARIS)
// The Alsa device to use when opening an audio input stream.
const char kAlsaInputDevice[] = "alsa-input-device";
// The Alsa device to use when opening an audio stream.
const char kAlsaOutputDevice[] = "alsa-output-device";
#endif
// Use GpuMemoryBuffers for Video Capture when this is an option for the device.
// Experimental, see http://crbug.com/503835 and http://crbug.com/440843.
const char kUseGpuMemoryBuffersForCapture[] =
"use-gpu-memory-buffers-for-capture";
#if defined(OS_MACOSX)
// AVFoundation is available in versions 10.7 and onwards, and is to be used
// http://crbug.com/288562 for both audio and video device monitoring and for
// video capture. Being a dynamically loaded NSBundle and library, it hits the
// Chrome startup time (http://crbug.com/311325 and http://crbug.com/311437);
// for experimentation purposes, in particular library load time issue, the
// usage of this library can be enabled by using this flag.
const char kEnableAVFoundation[] = "enable-avfoundation";
// QTKit is the media capture API predecessor to AVFoundation, available up and
// until Mac OS X 10.9 (despite being deprecated in this last one). This flag
// is used for troubleshooting and testing, and forces QTKit in builds and
// configurations where AVFoundation would be used otherwise.
const char kForceQTKit[] = "force-qtkit";
#endif
#if defined(OS_WIN)
// Use exclusive mode audio streaming for Windows Vista and higher.
// Leads to lower latencies for audio streams which uses the
// AudioParameters::AUDIO_PCM_LOW_LATENCY audio path.
// See http://msdn.microsoft.com/en-us/library/windows/desktop/dd370844.aspx
// for details.
const char kEnableExclusiveAudio[] = "enable-exclusive-audio";
// Force the use of MediaFoundation for video capture. This is only supported in
// Windows 7 and above. Used, like |kForceDirectShowVideoCapture|, to
// troubleshoot problems in Windows platforms.
const char kForceMediaFoundationVideoCapture[] = "force-mediafoundation";
// Use Windows WaveOut/In audio API even if Core Audio is supported.
const char kForceWaveAudio[] = "force-wave-audio";
// Instead of always using the hardware channel layout, check if a driver
// supports the source channel layout. Avoids outputting empty channels and
// permits drivers to enable stereo to multichannel expansion. Kept behind a
// flag since some drivers lie about supported layouts and hang when used. See
// http://crbug.com/259165 for more details.
const char kTrySupportedChannelLayouts[] = "try-supported-channel-layouts";
// Number of buffers to use for WaveOut.
const char kWaveOutBuffers[] = "waveout-buffers";
#endif
#if defined(USE_CRAS)
// Use CRAS, the ChromeOS audio server.
const char kUseCras[] = "use-cras";
#endif
#if !defined(OS_ANDROID)
// Use a media session for each tabs in a way that two tabs can't play on top of
// each other. This is different from the Media Session API as it is enabling a
// default behaviour for the browser.
const char kEnableDefaultMediaSession[] = "enable-default-media-session";
#endif
// Use fake device for Media Stream to replace actual camera and microphone.
const char kUseFakeDeviceForMediaStream[] = "use-fake-device-for-media-stream";
// Use an .y4m file to play as the webcam. See the comments in
// media/capture/video/file_video_capture_device.h for more details.
const char kUseFileForFakeVideoCapture[] = "use-file-for-fake-video-capture";
// Play a .wav file as the microphone. Note that for WebRTC calls we'll treat
// the bits as if they came from the microphone, which means you should disable
// audio processing (lest your audio file will play back distorted). The input
// file is converted to suit Chrome's audio buses if necessary, so most sane
// .wav files should work.
const char kUseFileForFakeAudioCapture[] = "use-file-for-fake-audio-capture";
// Enables support for inband text tracks in media content.
const char kEnableInbandTextTracks[] = "enable-inband-text-tracks";
// When running tests on a system without the required hardware or libraries,
// this flag will cause the tests to fail. Otherwise, they silently succeed.
const char kRequireAudioHardwareForTesting[] =
"require-audio-hardware-for-testing";
// Allows clients to override the threshold for when the media renderer will
// declare the underflow state for the video stream when audio is present.
// TODO(dalecurtis): Remove once experiments for http://crbug.com/470940 finish.
const char kVideoUnderflowThresholdMs[] = "video-underflow-threshold-ms";
// Disables the new rendering algorithm for webrtc, which is designed to improve
// the rendering smoothness.
const char kDisableRTCSmoothnessAlgorithm[] =
"disable-rtc-smoothness-algorithm";
} // namespace switches
namespace media {
// Use shared block-based buffering for media.
const base::Feature kUseNewMediaCache{"use-new-media-cache",
base::FEATURE_DISABLED_BY_DEFAULT};
} // namespace media
|
