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 // Enables ADTS stream parser for Media Source Extensions.
  16 const char kEnableADTSStreamParser[] = "enable-adts-stream-parser";
  17
  18 // Bypass autodetection of the upper limit on resolution of streams that can
  19 // be hardware decoded.
  20 const char kIgnoreResolutionLimitsForAcceleratedVideoDecode[] =
  21     "ignore-resolution-limits-for-accelerated-video-decode";
  22
  23 #if defined(OS_ANDROID)
  24 // Disables the infobar popup for accessing protected media identifier.
  25 const char kDisableInfobarForProtectedMediaIdentifier[] =
  26     "disable-infobar-for-protected-media-identifier";
  27
  28 // Enables use of non-compositing MediaDrm decoding by default for Encrypted
  29 // Media Extensions implementation.
  30 const char kMediaDrmEnableNonCompositing[] = "mediadrm-enable-non-compositing";
  31 #endif
  32
  33 #if defined(OS_LINUX) || defined(OS_FREEBSD) || defined(OS_SOLARIS)
  34 // The Alsa device to use when opening an audio input stream.
  35 const char kAlsaInputDevice[] = "alsa-input-device";
  36 // The Alsa device to use when opening an audio stream.
  37 const char kAlsaOutputDevice[] = "alsa-output-device";
  38 #endif
  39
  40 #if defined(OS_MACOSX)
  41 // AVFoundation is available in versions 10.7 and onwards, and is to be used
  42 // http://crbug.com/288562 for both audio and video device monitoring and for
  43 // video capture. Being a dynamically loaded NSBundle and library, it hits the
  44 // Chrome startup time (http://crbug.com/311325 and http://crbug.com/311437);
  45 // for experimentation purposes, in particular library load time issue, the
  46 // usage of this library can be enabled by using this flag.
  47 const char kEnableAVFoundation[] = "enable-avfoundation";
  48
  49 // QTKit is the media capture API predecessor to AVFoundation, available up and
  50 // until Mac OS X 10.9 (despite being deprecated in this last one). This flag
  51 // is used for troubleshooting and testing, and forces QTKit in builds and
  52 // configurations where AVFoundation would be used otherwise.
  53 const char kForceQTKit[] = "force-qtkit";
  54 #endif
  55
  56 #if defined(OS_WIN)
  57 // Use exclusive mode audio streaming for Windows Vista and higher.
  58 // Leads to lower latencies for audio streams which uses the
  59 // AudioParameters::AUDIO_PCM_LOW_LATENCY audio path.
  60 // See http://msdn.microsoft.com/en-us/library/windows/desktop/dd370844.aspx
  61 // for details.
  62 const char kEnableExclusiveAudio[] = "enable-exclusive-audio";
  63
  64 // Used to troubleshoot problems with different video capture implementations
  65 // on Windows.  By default we use the Media Foundation API on Windows 7 and up,
  66 // but specifying this switch will force use of DirectShow always.
  67 // See bug: http://crbug.com/268412
  68 const char kForceDirectShowVideoCapture[] = "force-directshow";
  69
  70 // Force the use of MediaFoundation for video capture. This is only supported in
  71 // Windows 7 and above. Used, like |kForceDirectShowVideoCapture|, to
  72 // troubleshoot problems in Windows platforms.
  73 const char kForceMediaFoundationVideoCapture[] = "force-mediafoundation";
  74
  75 // Use Windows WaveOut/In audio API even if Core Audio is supported.
  76 const char kForceWaveAudio[] = "force-wave-audio";
  77
  78 // Instead of always using the hardware channel layout, check if a driver
  79 // supports the source channel layout.  Avoids outputting empty channels and
  80 // permits drivers to enable stereo to multichannel expansion.  Kept behind a
  81 // flag since some drivers lie about supported layouts and hang when used.  See
  82 // http://crbug.com/259165 for more details.
  83 const char kTrySupportedChannelLayouts[] = "try-supported-channel-layouts";
  84
  85 // Number of buffers to use for WaveOut.
  86 const char kWaveOutBuffers[] = "waveout-buffers";
  87 #endif
  88
  89 #if defined(USE_CRAS)
  90 // Use CRAS, the ChromeOS audio server.
  91 const char kUseCras[] = "use-cras";
  92 #endif
  93
  94 // Use fake device for Media Stream to replace actual camera and microphone.
  95 const char kUseFakeDeviceForMediaStream[] = "use-fake-device-for-media-stream";
  96
  97 // Use a raw video file as fake video capture device.
  98 const char kUseFileForFakeVideoCapture[] = "use-file-for-fake-video-capture";
  99
 100 }  // namespace switches