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 a raw video file as fake video capture device. 95 const char kUseFileForFakeVideoCapture[] = "use-file-for-fake-video-capture"; 96 97 // Enables support for inband text tracks in media content. 98 const char kEnableInbandTextTracks[] = "enable-inband-text-tracks"; 99 100 } // namespace switches 101