Mednafen - My Emulator Doesn't Need A Frickin' Excellent Name

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Error opening a sound device

Situation

mednafen -autosave 1 -sound 1 path/to/ROM/image
Initializing sound...
	Using "ALSA" audio driver with SexyAL's default device selection.ALSA Error: snd_pcm_open(&alsa_pcm, id ? id : "hw:0", SND_PCM_STREAM_PLAYBACK, 0) Device or resource busy
Error opening a sound device.

Details

Solution

Temporarily suspend PulseAudio :
pasuspender -- mednafen -autosave 1 -sound 1 path/to/ROM/image
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Keys

Key Usage
0 to 9 Select save state slot
F5 Save state
F7 Load state
Alt- Toggle fullscreen
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How to reconfigure keys ?

This works both for keyboards and USB gamepads.

This is as simple as : ALT-SHIFT-1. If it doesn't work :
  1. Close Mednafen
  2. Edit Mednafen's configuration file
  3. Search input_config1, which should lead to a line such as :
    command.input_config1 keyboard 49+alt+shift
  4. Update key to the value of the m key (109) : 
    command.input_config1 keyboard 109

    What we're doing here is just changing the key to enter the "reconfigure keys" mode. We've chosen the m key, but it could have been any other key.
    To find the code of a key, you'll have to :

    1. get the SDL_Keycode Value of a key (example : m → SDLK_m)
    2. find the decimal value matching this code (SDLK_m → 109)

  5. Start Mednafen, press m and follow the on-screen instructions to re-assign keys
  6. Enjoy !
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Mednafen file tree

~ personal home dir
.mednafen hidden directory for Mednafen's data
mednafen-09x.cfg configuration file (was mednafen.cfg, more)
mcs directory for game state snapshots
romName.hash.ncq game snapshot
sav save directory for games having a "Save" function
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General documentation :		http://mednafen.fobby.net/documentation/
Command-line arguments :	http://mednafen.fobby.net/documentation/#Core+Features%01Using+Mednafen%01Global+Settings+Reference
	autosave	defaults to '1' in my version (?)

Game Boy Documentation :	http://mednafen.fobby.net/documentation/gb.html
	gb.stretch	'aspect' is not supported
	gb.videoip