[bug#38941] [PATCH 0/5] Support fluidsynth and opus in sdl(2)-mixer, and other tweaks

[Timotej Lazar]

Hi,

these patches improve sdl- and sdl2-mixer: fix dependencies and
configure flags that changed between the two versions, and enable
support for fluidsynth and opus libraries. I tested several dependent
packages, and everything seems to work OK.

The MIDI backends need additional runtime configuration. Fluidsynth
requires a soundfont to be installed and specified when running a
program that uses sdl-mixer, e.g.:

    SDL_SOUNDFONTS=/gnu/store/…-fluid-3-2.1/share/soundfonts/FluidR3Mono_GM.sf3

If this is not set, the bundled timidity backend is used, which can use
the freepats samples. Configuration must be specified since only files
under /etc are checked by default, e.g.:

    TIMIDITY_CFG=/gnu/store/…-freepats-20060219/share/freepats/freepats.cfg

I’m not sure if and how default values for these vars can be specified
for all programs using sdl-mixer, and I would prefer to leave the choice
of backend to the user anyway. However, we should probably document them
somewhere. Would a comment be enough? Dependent packages can then wrap
binaries to set required paths if needed.

Alternatively we can add freepats and/or fluid as inputs to sdl(2)-mixer
and patch the source to look for them in the store.

Thanks!
Timotej

Timotej Lazar (5):
  gnu: sdl-mixer: Use correct inputs for MOD file support.
  gnu: sdl-mixer: Remove unused configure flag.
  gnu: sdl2-mixer: Fix configure flags.
  gnu: sdl-mixer: Enable fluidsynth MIDI backend.
  gnu: sdl2-mixer: Enable opus support.

 gnu/packages/sdl.scm | 49 +++++++++++++++++++++++++++++---------------
 1 file changed, 33 insertions(+), 16 deletions(-)

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2.24.1