new packages: JACK Audio Connection Kit and alsa-lib

[knyipab]

Few packages

• jack2 is an audio server. On Android, it can use OpenSLES as backend.
• The metapackage jack is for dependency management and will accept the upcoming pipewire-jack as an option. By the way, I am not interested in making jack1 functional and be one of the jack option, given that we have jack2 now and it seems Linux distros usually not packing jack1 officially (at least for Archlinux it is in AUR).
• alsa-lib as deps of jack2. Also, it is tested to work along with pipewire-alsa which will be finalized in the pipewire PR.
• mpv and mpv-x are updated to support jack and alsa audio output

Tested working with:

jackd -d opensles

and then use the updated mpv in this PR

mpv --ao=jack ./test.wav

By the way, since #20353 also use jack (which I put a stub and useless jack1), I will refactor that PR after this is merged.

[Grimler91]

Thanks for the PR, exciting work! I think we can drop BUILD_DEPENDS on jack2 for mpv, otherwise looks good!

[knyipab]

Refactored to remove ANTI_BUILD_DEPENDS, added few utils pacakges and added 0004 patch to jack2 to remove some superuser features, paving the way to debug with jack-enabled ardour in the future.

There are quite some issues in alsa-lib and jack2, but still, I suggest merging this PR first because

1. Those issues are mostly beyond the scope of this PR
2. shotcut (PR new packages: shotcut, mlt and their deps #20353) needs jack and pipewire-alsa (PR pipewire full features #20483) will need alsa-lib.
3. There should be little to no harm to merge cuz existing packages aren't compiled with alsa-lib and jack. Fixes can be done later each time we enable alsa and jack features for other packages.

• ALSA has no access to kernel driver thru /dev/snd/*
  • rawmidi: implementation with Amidi NDK and MidiManager SDK will be a substantial work and probably need Termux:API
  • seq: a user-space alsa sequencer server probably helps https://github.com/hselasky/alsa-seq-server?tab=readme-ov-file
• jack2 prompts quite some errors when using with a jack-enabled ardour

[Grimler91]

Thanks! Exciting work :)

[TomJo2000]

Since this reinstates support for alsa-utils I have removed it from disabled-packages in 7a1f71a.

Please check that volume_mapping.c.patch is not still applicable to the reinstated version.

termux-packages/disabled-packages/alsa-utils/volume_mapping.c.patch

Lines 1 to 11 in 2d69c05

	--- ./alsamixer/volume_mapping.c 2016-08-02 22:39:45.000000000 +0530
	+++ ../volume_mapping.c 2016-12-03 23:15:26.390744307 +0530
	@@ -37,7 +37,7 @@
	#include <stdbool.h>
	#include "volume_mapping.h"
	-#ifdef __UCLIBC__
	+#if defined(__UCLIBC__) || defined(__ANDROID__)
	/* 10^x = 10^(log e^x) = (e^x)^log10 = e^(x * log 10) */
	#define exp10(x) (exp((x) * log(10)))
	#endif /* __UCLIBC__ */

[knyipab]

There is no #define exp10(x) and no use of exp10 in the current version of alsa-utils.