15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright (c) 2012 The Chromium Authors. All rights reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// found in the LICENSE file. 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "media/base/media_switches.h" 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace switches { 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 92a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)// Allow users to specify a custom buffer size for debugging purpose. 102a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)const char kAudioBufferSize[] = "audio-buffer-size"; 112a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 12868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)// Enable EAC3 playback in MSE. 13868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)const char kEnableEac3Playback[] = "enable-eac3-playback"; 14868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) 15868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)// Enables Opus playback in media elements. 16868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)const char kEnableOpusPlayback[] = "enable-opus-playback"; 17868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) 18868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)// Enables VP8 Alpha playback in media elements. 19868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)const char kEnableVp8AlphaPlayback[] = "enable-vp8-alpha-playback"; 20868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) 21868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)// Set number of threads to use for video decoding. 22868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)const char kVideoThreads[] = "video-threads"; 23868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) 24eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch// Override suppressed responses to canPlayType(). 25eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdochconst char kOverrideEncryptedMediaCanPlayType[] = 26eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch "override-encrypted-media-canplaytype"; 27eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch 28868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)#if defined(GOOGLE_TV) 29868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)// Use external video surface for video with more than or equal pixels to 30868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)// specified value. For example, value of 0 will enable external video surface 31868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)// for all videos, and value of 921600 (=1280*720) will enable external video 32868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)// surface for 720p video and larger. 33868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)const char kUseExternalVideoSurfaceThresholdInPixels[] = 34868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) "use-external-video-surface-threshold-in-pixels"; 35868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)#endif 36868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#if defined(OS_LINUX) || defined(OS_FREEBSD) || defined(OS_SOLARIS) 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// The Alsa device to use when opening an audio input stream. 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)const char kAlsaInputDevice[] = "alsa-input-device"; 40868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)// The Alsa device to use when opening an audio stream. 41868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)const char kAlsaOutputDevice[] = "alsa-output-device"; 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 44868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)#if defined(OS_MACOSX) 45868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)// Unlike other platforms, OSX requires CoreAudio calls to happen on the main 46868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)// thread of the process. Provide a way to disable this until support is well 47868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)// tested. See http://crbug.com/158170. 48868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)// TODO(dalecurtis): Remove this once we're sure nothing has exploded. 49868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)const char kDisableMainThreadAudio[] = "disable-main-thread-audio"; 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#if defined(OS_WIN) 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use exclusive mode audio streaming for Windows Vista and higher. 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Leads to lower latencies for audio streams which uses the 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// AudioParameters::AUDIO_PCM_LOW_LATENCY audio path. 56868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)// See http://msdn.microsoft.com/en-us/library/windows/desktop/dd370844.aspx 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// for details. 585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)const char kEnableExclusiveAudio[] = "enable-exclusive-audio"; 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 604311e82a78ceafbe0585f51d4c8a86df9f21aa0dBen Murdoch// Used to troubleshoot problems with different video capture implementations 614311e82a78ceafbe0585f51d4c8a86df9f21aa0dBen Murdoch// on Windows. By default we use the Media Foundation API on Windows 7 and up, 624311e82a78ceafbe0585f51d4c8a86df9f21aa0dBen Murdoch// but specifying this switch will force use of DirectShow always. 634311e82a78ceafbe0585f51d4c8a86df9f21aa0dBen Murdoch// See bug: http://crbug.com/268412 644311e82a78ceafbe0585f51d4c8a86df9f21aa0dBen Murdochconst char kForceDirectShowVideoCapture[] = "force-directshow"; 654311e82a78ceafbe0585f51d4c8a86df9f21aa0dBen Murdoch 66c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)// Use Windows WaveOut/In audio API even if Core Audio is supported. 67c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)const char kForceWaveAudio[] = "force-wave-audio"; 68c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) 69f3ce491c3623b9924dccab3703a43e03157e988aTorne (Richard Coles)// Instead of always using the hardware channel layout, check if a driver 70f3ce491c3623b9924dccab3703a43e03157e988aTorne (Richard Coles)// supports the source channel layout. Avoids outputting empty channels and 71f3ce491c3623b9924dccab3703a43e03157e988aTorne (Richard Coles)// permits drivers to enable stereo to multichannel expansion. Kept behind a 72f3ce491c3623b9924dccab3703a43e03157e988aTorne (Richard Coles)// flag since some drivers lie about supported layouts and hang when used. See 73f3ce491c3623b9924dccab3703a43e03157e988aTorne (Richard Coles)// http://crbug.com/259165 for more details. 74f3ce491c3623b9924dccab3703a43e03157e988aTorne (Richard Coles)const char kTrySupportedChannelLayouts[] = "try-supported-channel-layouts"; 75f3ce491c3623b9924dccab3703a43e03157e988aTorne (Richard Coles) 76868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)// Number of buffers to use for WaveOut. 772a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)const char kWaveOutBuffers[] = "waveout-buffers"; 782a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#endif 792a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 80868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)#if defined(USE_CRAS) 81868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)// Use CRAS, the ChromeOS audio server. 82868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)const char kUseCras[] = "use-cras"; 83b2df76ea8fec9e32f6f3718986dba0d95315b29cTorne (Richard Coles)#endif 84b2df76ea8fec9e32f6f3718986dba0d95315b29cTorne (Richard Coles) 855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace switches 86