[Ohrrpgce] SDL_mixer and loop points

[James Paige]

I must have been confusing the LGPL rules.

What was the reason for wanting SDL Mixer X on Android, just for the
Midi/BAM synths?

On Thu, Nov 21, 2019, 6:57 PM Ralph Versteegen <teeemcee at gmail.com> wrote:

> You can't dynamically link to a GPL library without the whole program
> being GPL.
>
> I haven't forgotten about the relicensing either, I need to send that
> email.
>
> It would be rare that someone would be using a backend without loop point
> support (eg non-MIDI audio don't even work in music_native/native2 on
> Windows currently; noone is using them), but that warning would be a good
> idea.
>
> On Fri, 22 Nov 2019 at 01:53, James Paige <Bob at hamsterrepublic.com> wrote:
>
>> The loop support thing sounds cool. I like the idea of in editor support,
>> although we'll probably also want some in-editor warning text to let people
>> know that support is dependent on backend.
>>
>> As for the relicensing, I haven't forgotten about that. I do still want
>> to do it.
>>
>> Could using a GPL3 licenced music library work better if it was a dynamic
>> library, for greater separation? Sort of like how gfx_directx is
>> implemented as a dll?
>>
>> ---
>> James
>>
>> On Thu, Nov 21, 2019, 6:33 AM Ralph Versteegen <teeemcee at gmail.com>
>> wrote:
>>
>>> I know I've discussed this before, but apparently not on the mailinglist.
>>>
>>> SDL_Mixer 2 added support for .ogg loop points a couple of years ago.
>>> (Strangely it's not in the changelog)
>>>
>>> Loop points work as LOOPSTART and LOOPEND or LOOPLENGTH (optional)
>>> comments embedded in the .ogg file. LOOPSTART+LOOPLENGTH is RPG
>>> Maker-compatible.
>>>
>>> Within the last few days to weeks, more stuff has landed in SDL_mixer hg.
>>> -loop points in FLAC files (note: I compiled sdl_mixer.dll without FLAC
>>> support)
>>> -loop points can now be expressed in hh:mm:ss notation, or named
>>> LOOP_START or LOOP-START, for compatibility with Doom source ports
>>> https://zdoom.org/wiki/Audio_loop
>>> -loop points now respect the number of times we asked SDL_mixer to loop
>>> the song. I believe after that number of loops, it'll proceed past LOOPEND
>>> to the end, and then stop (not loop to beginning). Someone could always
>>> submit a patch for another comment controlling a separate loop count.
>>>
>>> So I would like to add the ability to edit loop-points right in the
>>> music import menu.
>>>
>>> We already have code for adding comments to an .ogg file when converting
>>> .mp3 to .ogg, but it seems to oggenc can't be used to add comments to an
>>> existing ogg file. Instead, the vorbiscomment program (part of
>>> vorbis-tools) does that. Another 186kB download.
>>> <http://www.rarewares.org/files/ogg/vorbiscomment-1.2.0.zip>
>>>
>>> === SDL_mixer 1.2 ===
>>>
>>> Loop points aren't in SDL_mixer 1.2. There hasn't been an update to
>>> SDL_mixer 1.2 since 2012, but it looks like they're preparing a bugfix one,
>>> including a number of backported loop-related bugfixes. It's certainly not
>>> getting any features.
>>>
>>> There are only a couple bugs that I'm aware of left in gfx_sdl2; I'd
>>> like to fix them and switch to it as default on Mac, Linux and Windows
>>> after Fufluns is released
>>>
>>> However the ogg loop stuff is spread over just a few of commits and
>>> should be very easy to backport to SDL_mixer 1.2, for our own build of
>>> sdl_mixer.dll (for people who want to stick to gfx_sdl instead of gfx_sdl2
>>> for whatever reason) and also for the android port.
>>>
>>> === SDL_mixer X ===
>>>
>>> Loop points were first implemented in SDL_mixer X, which is a fork of
>>> SDL_mixer 2, which has a number of interesting features.
>>> https://wohlsoft.github.io/SDL-Mixer-X/
>>>
>>> Most notably, it supports many more module formats and has ADLMIDI
>>> (OPL3) and OPNMIDI OPN2 synthesizer-based MIDI players, which could be used
>>> to play MIDI on Android or elsewhere without needing soundfonts. Sounds
>>> different to MIDI playback with a soundfont, but I think in most case
>>> ADLMIDI not bad (except percussion maybe). These both also support
>>> controller 111-based loop points (RPG Maker-compatible), just like
>>> music_native/native2 do. They could also be used to implement true BAM
>>> playback. (ADLMIDI contains at least two OPL3 synthesizers: Nuked and
>>> DOSbox)
>>>
>>> But these synths are GPLv3+ licensed, which is a problem (inhibiting
>>> relicensing of the engine). So maybe we could use it just on Android for
>>> MIDI playback, and not for BAM. iOS has MIDI support builtin.
>>> _______________________________________________
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>>> http://lists.motherhamster.org/listinfo.cgi/ohrrpgce-motherhamster.org
>>>
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