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https://github.com/kyleneideck/BackgroundMusic
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Rename BGMDevice from "Background Music Device" to "Background Music".
Resolves #116.
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5 changed files with 21 additions and 19 deletions
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@ -150,7 +150,7 @@ static float const kStatusBarIconPadding = 0.25;
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NSError* error = [audioDevices setBGMDeviceAsOSDefault];
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if (error) {
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[self showSetDeviceAsDefaultError:error
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message:@"Could not set Background Music Device as your default audio device."
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message:@"Could not set the Background Music device as your default audio device."
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informativeText:@"You might be able to set it yourself."];
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}
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}
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@ -224,7 +224,7 @@ static float const kStatusBarIconPadding = 0.25;
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// TODO: Check whether the driver files are in /Library/Audio/Plug-Ins/HAL and offer to install them if not. Also,
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// it would be nice if we could restart coreaudiod automatically (using launchd).
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[alert setMessageText:@"Could not find the Background Music virtual audio device."];
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[alert setInformativeText:@"Make sure you've installed Background Music.driver to /Library/Audio/Plug-Ins/HAL and restarted coreaudiod (e.g. \"sudo killall coreaudiod\")."];
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[alert setInformativeText:@"Make sure you've installed Background Music Device.driver to /Library/Audio/Plug-Ins/HAL and restarted coreaudiod (e.g. \"sudo killall coreaudiod\")."];
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} else if (code == kBGMErrorCode_OutputDeviceNotFound) {
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[alert setMessageText:@"Could not find an audio output device."];
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[alert setInformativeText:@"If you do have one installed, this is probably a bug. Sorry about that. Feel free to file an issue on GitHub."];
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@ -195,7 +195,7 @@ private:
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static pthread_once_t sStaticInitializer;
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static BGM_Device* __nonnull sInstance;
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#define kDeviceName "Background Music Device"
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#define kDeviceName "Background Music"
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#define kDeviceManufacturerName "Background Music contributors"
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enum
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@ -17,7 +17,7 @@ Device". They're shown in `System Preferences > Sound` along with the real audio
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When you start BGMApp, it sets BGMDevice as your system's default output device so the system (i.e. Core Audio) will
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start sending all<sup id="a1">[1](#f1)</sup> your audio data to BGMDriver. BGMDriver plays that audio on BGMDevice's
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input stream, and the user can record it by selecting "Background Music Device" in QuickTime the same way they'd select
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input stream, and the user can record it by selecting the Background Music device in QuickTime the same way they'd select
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a microphone.
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So that you can still hear the audio, BGMApp starts listening to BGMDevice's input stream and playing the audio out of
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@ -50,10 +50,10 @@ Nothing](http://www.rossbencina.com/code/real-time-audio-programming-101-time-wa
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## BGMDriver
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The BGMDriver project is an audio driver for a virtual audio device called Background Music Device, which we use to
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intercept the audio playing on the user's system. The driver processes the audio data to apply per-app volumes, see if
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the music player is playing, etc. and then writes the audio to BGMDevice's input stream. It's essentially a loopback
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device with a few extra features.
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The BGMDriver project is an audio driver for a virtual audio device named "Background Music", which we use to intercept
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the audio playing on the user's system. The driver processes the audio data to apply per-app volumes, see if the music
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player is playing, etc. and then writes the audio to BGMDevice's input stream. It's essentially a loopback device with a
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few extra features.
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There are quite a few other open-source projects with drivers that do the same
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thing--[Soundflower](https://github.com/mattingalls/Soundflower) is probably the most well known--but as far as I know
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22
README.md
22
README.md
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@ -51,11 +51,11 @@ their normal maximum volume.
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## Recording system audio
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With Background Music running, open QuickTime Player and go `File > New Audio Recording...` (or movie/screen). Then
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click the arrow next to the record button that looks like `⌄` and select `Background Music Device` as the input device.
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click the arrow next to the record button that looks like `⌄` and select `Background Music` as the input device.
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You should be able to record system audio and a microphone together by creating an [aggregate
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device](https://support.apple.com/en-us/HT202000) that combines your input device (usually Built-in Input) with
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Background Music Device. You can create the aggregate device using the Audio MIDI Setup utility from
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the Background Music device. You can create the aggregate device using the Audio MIDI Setup utility from
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`/Applications/Utilities`.
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## Install from source
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@ -109,9 +109,11 @@ consider submitting a bug report, too.)
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## Troubleshooting
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If Background Music crashes and system audio stops working, open the Sound panel in System Preferences and change your
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system's default output device to something other than Background Music Device. If it already is, it might help to
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change the default device and then change it back again. Failing that, you might have to uninstall.
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If Background Music crashes and your audio stops working, open the Sound panel in System Preferences and change your
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system's default output device to something other than the Background Music device. If it already is, it might help to
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change the default device and then change it back again.
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Failing that, you might have to uninstall. Consider filing a bug report if you do.
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## Known issues
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@ -124,13 +126,13 @@ change the default device and then change it back again. Failing that, you might
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General tab of Skype's preferences.
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- Plugging in or unplugging headphones when Background Music isn't running can silence system audio. To fix it, go to
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the Sound section in System Preferences, click the Output tab and change your default output device to something other
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than Background Music Device. Alternatively, you may Option+Click on the Sound icon in the menu bar to select a
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than the Background Music device. Alternatively, you may Option+Click on the Sound icon in the menu bar to select a
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different output device.
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This happens when macOS remembers that Background Music Device was your default audio device the last time you last
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used (or didn't use) headphones.
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- [A recent Chrome bug](https://bugs.chromium.org/p/chromium/issues/detail?id=557620) can stop Chrome from switching to
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Background Music Device after you open Background Music. Chrome's audio will still play, but Background Music won't be
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This happens when macOS remembers that the Background Music device was your default audio device the last time you
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last used (or didn't use) headphones.
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- [A Chrome bug](https://bugs.chromium.org/p/chromium/issues/detail?id=557620) can stop Chrome from switching to the
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Background Music device after you open Background Music. Chrome's audio will still play, but Background Music won't be
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aware of it.
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- Some apps play notification sounds that are only just long enough to trigger an auto-pause. The only workaround right
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now is to increase the `kPauseDelayNSec` constant in [BGMAutoPauseMusic.mm](/BGMApp/BGMApp/BGMAutoPauseMusic.mm).
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2
TODO.md
2
TODO.md
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@ -70,7 +70,7 @@ There are also lots of other TODOs commented around the code.
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- Should we hide the BGM device when BGMApp isn't running? This would fix the problem of our device being left as the
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default device if BGMApp doesn't shutdown properly (because of a crash, hard reset, etc.), which stops the system from
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playing audio. The problem with that is Background Music Device can still be used without BGMApp, to record
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playing audio. The problem with that is the Background Music device can still be used without BGMApp, to record
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system/apps' audio, so ideally the BGM device would be able to just unset itself as the default device when BGMApp
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isn't running. For now, I think we should just have `kAudioDevicePropertyDeviceCanBeDefaultDevice` become false.
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