media/base/media_switches.cc

   1 // Copyright (c) 2012 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 "media/base/media_switches.h"
   6
   7 namespace switches {
   8
   9 // Allow users to specify a custom buffer size for debugging purpose.
  10 const char kAudioBufferSize[] = "audio-buffer-size";
  11
  12 // Set number of threads to use for video decoding.
  13 const char kVideoThreads[] = "video-threads";
  14
  15 // Bypass autodetection of the upper limit on resolution of streams that can
  16 // be hardware decoded.
  17 const char kIgnoreResolutionLimitsForAcceleratedVideoDecode[] =
  18     "ignore-resolution-limits-for-accelerated-video-decode";
  19
  20 #if defined(OS_ANDROID)
  21 // Disables the infobar popup for accessing protected media identifier.
  22 const char kDisableInfobarForProtectedMediaIdentifier[] =
  23     "disable-infobar-for-protected-media-identifier";
  24
  25 // Enables use of non-compositing MediaDrm decoding by default for Encrypted
  26 // Media Extensions implementation.
  27 const char kMediaDrmEnableNonCompositing[] = "mediadrm-enable-non-compositing";
  28 #endif
  29
  30 #if defined(OS_LINUX) || defined(OS_FREEBSD) || defined(OS_SOLARIS)
  31 // The Alsa device to use when opening an audio input stream.
  32 const char kAlsaInputDevice[] = "alsa-input-device";
  33 // The Alsa device to use when opening an audio stream.
  34 const char kAlsaOutputDevice[] = "alsa-output-device";
  35 #endif
  36
  37 #if defined(OS_MACOSX)
  38 // AVFoundation is available in versions 10.7 and onwards, and is to be used
  39 // http://crbug.com/288562 for both audio and video device monitoring and for
  40 // video capture. Being a dynamically loaded NSBundle and library, it hits the
  41 // Chrome startup time (http://crbug.com/311325 and http://crbug.com/311437);
  42 // for experimentation purposes, in particular library load time issue, the
  43 // usage of this library can be enabled by using this flag.
  44 const char kEnableAVFoundation[] = "enable-avfoundation";
  45
  46 // QTKit is the media capture API predecessor to AVFoundation, available up and
  47 // until Mac OS X 10.9 (despite being deprecated in this last one). This flag
  48 // is used for troubleshooting and testing, and forces QTKit in builds and
  49 // configurations where AVFoundation would be used otherwise.
  50 const char kForceQTKit[] = "force-qtkit";
  51 #endif
  52
  53 #if defined(OS_WIN)
  54 // Use exclusive mode audio streaming for Windows Vista and higher.
  55 // Leads to lower latencies for audio streams which uses the
  56 // AudioParameters::AUDIO_PCM_LOW_LATENCY audio path.
  57 // See http://msdn.microsoft.com/en-us/library/windows/desktop/dd370844.aspx
  58 // for details.
  59 const char kEnableExclusiveAudio[] = "enable-exclusive-audio";
  60
  61 // Used to troubleshoot problems with different video capture implementations
  62 // on Windows.  By default we use the Media Foundation API on Windows 7 and up,
  63 // but specifying this switch will force use of DirectShow always.
  64 // See bug: http://crbug.com/268412
  65 const char kForceDirectShowVideoCapture[] = "force-directshow";
  66
  67 // Force the use of MediaFoundation for video capture. This is only supported in
  68 // Windows 7 and above. Used, like |kForceDirectShowVideoCapture|, to
  69 // troubleshoot problems in Windows platforms.
  70 const char kForceMediaFoundationVideoCapture[] = "force-mediafoundation";
  71
  72 // Use Windows WaveOut/In audio API even if Core Audio is supported.
  73 const char kForceWaveAudio[] = "force-wave-audio";
  74
  75 // Instead of always using the hardware channel layout, check if a driver
  76 // supports the source channel layout.  Avoids outputting empty channels and
  77 // permits drivers to enable stereo to multichannel expansion.  Kept behind a
  78 // flag since some drivers lie about supported layouts and hang when used.  See
  79 // http://crbug.com/259165 for more details.
  80 const char kTrySupportedChannelLayouts[] = "try-supported-channel-layouts";
  81
  82 // Number of buffers to use for WaveOut.
  83 const char kWaveOutBuffers[] = "waveout-buffers";
  84 #endif
  85
  86 #if defined(USE_CRAS)
  87 // Use CRAS, the ChromeOS audio server.
  88 const char kUseCras[] = "use-cras";
  89 #endif
  90
  91 // Use fake device for Media Stream to replace actual camera and microphone.
  92 const char kUseFakeDeviceForMediaStream[] = "use-fake-device-for-media-stream";
  93
  94 // Use an .y4m file to play as the webcam. See the comments in
  95 // media/video/capture/file_video_capture_device.h for more details.
  96 const char kUseFileForFakeVideoCapture[] = "use-file-for-fake-video-capture";
  97
  98 // Play a .wav file as the microphone. Note that for WebRTC calls we'll treat
  99 // the bits as if they came from the microphone, which means you should disable
 100 // audio processing (lest your audio file will play back distorted). The input
 101 // file is converted to suit Chrome's audio buses if necessary, so most sane
 102 // .wav files should work.
 103 const char kUseFileForFakeAudioCapture[] = "use-file-for-fake-audio-capture";
 104
 105 // Enables support for inband text tracks in media content.
 106 const char kEnableInbandTextTracks[] = "enable-inband-text-tracks";
 107
 108 // When running tests on a system without the required hardware or libraries,
 109 // this flag will cause the tests to fail. Otherwise, they silently succeed.
 110 const char kRequireAudioHardwareForTesting[] =
 111     "require-audio-hardware-for-testing";
 112
 113 }  // namespace switches