Add gstreamer package

[th0ma7]

Description

Add gstreamer package

Fixes #3511

Checklist

• Build rule all-supported completed successfully
• New installation of package completed successfully
• Package upgrade completed successfully (Manually install the package again)
• Package functionality was tested
• Any needed documentation is updated/created

Type of change

• Bug fix
• New Package
• Package update
• Includes small framework changes
• This change requires a documentation update (e.g. Wiki)

[th0ma7]

Thnx! :)

[AlexPresso]

This would also fix #3511

[hgy59]

@th0ma7 please do not remove native/glib to prevent merge conflicts with #4337. native/glib is still required by cross/avahi in #4337 that I am working on.

After reading:

# Require access to glib-mkenums Python script
ENV += PATH=$(STAGING_INSTALL_PREFIX)/bin:$$PATH

I will add this to cross/avahi too. Thank you for telling that glib-mkenums is a (arch independent) python script.

[th0ma7]

@hgy59 and fellow @SynoCommunity/developers I've been looking into ways of building gst-omx in order to achieve hardware acceleration on platforms that support it. If a solution turns out working I might even be able to enable --enable-omx on ffmpeg as well.

I finally found some hints from the VideoStation sources here https://sourceforge.net/projects/dsgpl/files/Packages/DSM%206.1%20Package%20Release/ where Synology create a template file pointing directly to the pre-built OMX library to build up the various tools:

$ head gst-omx-virtual-video-station/config/synology/gstomx.conf.template
[omxmpeg2videodec]
type-name=GstOMXMPEG2VideoDec
core-name=__LIB_PREFIX__/libOMX_Core.so
component-name=OMX.realtek.video.dec
rank=258
in-port-index=0
out-port-index=1
sink-template-caps=video/mpeg,mpegversion=(int)[1, 2],systemstream=(boolean)false
src-template-caps=video/x-raw,format = (string) { NV12 },width=(int)[ 16, 4096 ],height=(int)[ 16, 4096 ],framerate=(fraction)[ 0/1, 2147483647/1 ]

Where __LIB_PREFIX__ is:

sed "s,__LIB_PREFIX__,${LibPrefix},g" "${GST_OMX_CONF}.template" > "${GST_OMX_CONF}"

And LibPrefix is:

LibPrefix="/var/packages/$PackageName/target/lib/realtek"

And PackageName is VideoStation (probably now CodecPack since newer releases).

Long-story-short, I'm thinking of a way to download+extract the official Synology package matching the arch so I could then link to it. I might even import the library all together which may be even simpler. If this actually works, it may lead into enabling hardware decoding on many many platforms.

Two questions comes to mind:

1. Where or how to set that up in spksrc? In a similar manner as we manager kernels/toolchain/toolkit? or using cross with install_resources and multi-file digests
2. But first and most importantly, I just can't find how to extract Synology latest official spk such as https://archive.synology.com/download/Package/VideoStation/3.0.3-2084 or https://archive.synology.com/download/Package/CodecPack/2.0.0-1017

Your thoughts (and help on extracting spk) would be much appreciated :)

[th0ma7]

For item no. 2 (e.g. extracting files from an Synology spk package) I think I have found all the ingredients... Its now a matter of making a short & sweet recipe out of it.

General howto, well made: https://www.cyberciti.biz/faq/pgp-tarball-file-signature-keys-verification/

Actual path where Synology store their keys on the nas:

root@th0ma7-nas:/usr/syno/etc/codesign# pwd
/usr/syno/etc/codesign
root@th0ma7-nas:/usr/syno/etc/codesign# ll
total 28
drwxr-xr-x  3 root root 4096 Aug 15  2021 .
drwxr-xr-x 64 root root 4096 Jun 10 10:34 ..
drwx------  2 root root 4096 Jun 10 14:45 .gnupg
-rw-r--r--  1 root root  175 Aug 15  2021 keyinfo-sys
-rw-r--r--  1 root root  224 Jun 10 14:45 keyinfo-user
-rw-r--r--  1 root root 3299 Aug 15  2021 keyring
-rw-r--r--  1 root root    1 Aug 15  2021 VERSION

Actual code that is/was used to validate the signed packages and extract them: https://pastebin.com/3vBYv662
And how to use codesign at page 25 of https://global.download.synology.com/download/Document/Software/DeveloperGuide/Firmware/DSM/6.0/enu/DSM_Developer_Guide_6_0.pdf

And finally Synology packages: https://archive.synology.com/download/Package

Optionally, this other pgp key might be useful: https://www.synology.com/en-global/support/security_pgp_key

[AlexPresso]

Three libraries fail to load when calling gst-launch-1.0:

root@Kloudy:/var/packages/gstreamer/target/bin$ ./gst-launch-1.0 -s 1200 fakevideosink

(gst-plugin-scanner:30702): GStreamer-WARNING **: 16:32:36.941: Failed to load plugin '/var/packages/gstreamer/target/lib/gstreamer-1.0/libgstcairo.so': libcairo-gobject.so.2: cannot open shared object file: No such file or directory

(gst-plugin-scanner:30702): GStreamer-WARNING **: 16:32:37.000: Failed to load plugin '/var/packages/gstreamer/target/lib/gstreamer-1.0/libgsttaglib.so': /spksrc/spk/gstreamer/work-aarch64-7.0/install/var/packages/gstreamer/target/lib/libz.so: cannot open shared object file: No such file or directory

(gst-plugin-scanner:30702): GStreamer-WARNING **: 16:32:37.081: Failed to load plugin '/var/packages/gstreamer/target/lib/gstreamer-1.0/libgstpng.so': /spksrc/spk/gstreamer/work-aarch64-7.0/install/var/packages/gstreamer/target/lib/libz.so: cannot open shared object file: No such file or directory

[publicarray]

Regarding point 1. Would this work as just another cross/ package? That way you don't need to modify the framework and this seems specific to just one package. Yea I think it belongs in cross or spk

[th0ma7]

@AlexPresso I was finally able to resume work on this PR. It isn't yet in a state I like but hardware acceleration on aarch64 using OMX "might" just work but there is no way for me to tell.

Just saying, I hadn't forgotten this... still on my pile 🤷‍♂️