Hello,

For all people interested in sound/video streaming:

After lots of work, I added the gst unit to the FPC packages. This unit contains the import declarations for the full libgstreamer-1.0 API. I didn't translate all C macros, but if you need some which I didn't translate, let me know and I will add them.

For those that are not in the know:
gstreamer is a powerful audio/video stream system, used on most modern linux distributions (it may be available on mac/windows, but I didn't test those).

I have also added a simple demo, that shows how to play a mp3 file.

I'm not an expert in sound/video streams, so if someone can contribute a more elaborate example, it would be most welcome :)

Enjoy,

Michael.

Hello Michael,

I would be very interested in this. Is there a link to the source and the example code please?

Thanks - Aruna

On Tue, Nov 1, 2022 at 6:45 AM Michael Van Canneyt via lazarus <

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Hello,

Yes, see here:

https://gitlab.com/freepascal.org/fpc/source/-/tree/main/packages/gstreamer

Michael.

Hi Michael,

Many thanks for the link. I have a few more questions please? I am running FPC 3.2.0
and Lazarus 2.0.10 how do I get your gstreamer code into my installation? What is the
preferred or best way to do this? It is my first time so apologies if this is a silly question.

Many thanks once again for your help.

Aruna

On Mon, Nov 7, 2022 at 2:14 AM Michael Van Canneyt via lazarus <

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In your case, I would recommend simply to copy the units into your project folder.

Alternatively, copy them to some folder on your harddisk, and add this folder to the unit path in the "project options" dialog in Lazarus. The compiler will then find them.

Michael.

On Tue, Nov 8, 2022 at 2:00 AM Michael Van Canneyt via lazarus <

Understood and will do so. Many thanks!

Again understood and will try both methods. Thank you :-)

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On Tue, Nov 8, 2022 at 2:00 AM Michael Van Canneyt via lazarus <

Hello Michael,

I tried to get things working but had problems with the IDE I have attached as screenshot.
https://pasteboard.co/xc64IUDOYVBb.png

Then I tried to see if I can get it going on the command line but trouble again, screenshot attached.
https://pasteboard.co/dHxckB8iMPxh.png

See below for details please:
--------------------------------------
aruna at debian:/media/aruna/linux-next/home/lazarus/gstreamer/example$ fpc playmp3
Free Pascal Compiler version 3.2.0+dfsg-12 [2021/01/25] for x86_64 Copyright (c) 1993-2020 by Florian Klaempfl and others Target OS: Linux for x86-64
Compiling playmp3.pp
playmp3.pp(48,95) Warning: range check error while evaluating constants (-1 must be between 0 and 18446744073709551615)
Linking playmp3
/usr/bin/ld.bfd: cannot find -lgstreamer-1.0
Error: Error while linking
Fatal: There were 1 errors compiling module, stopping Fatal: Compilation aborted
Error: /usr/bin/ppcx64 returned an error exitcode

----------------------------------------------------------------------------- So I changed the -1 to a 0 in line 48,95 and tried again.... -----------------------------------------------------------------------------

aruna at debian:/media/aruna/linux-next/home/lazarus/gstreamer/example$ fpc playmp3
Free Pascal Compiler version 3.2.0+dfsg-12 [2021/01/25] for x86_64 Copyright (c) 1993-2020 by Florian Klaempfl and others Target OS: Linux for x86-64
Compiling playmp3.pp
Linking playmp3
/usr/bin/ld.bfd: cannot find -lgstreamer-1.0
Error: Error while linking
Fatal: There were 1 errors compiling module, stopping Fatal: Compilation aborted
Error: /usr/bin/ppcx64 returned an error exitcode
aruna at debian:/media/aruna/linux-next/home/lazarus/gstreamer/example$

This time it tries to link but dies saying can't find : /usr/bin/ld.bfd: cannot find -lgstreamer-1.0

Now what? I will keep trying different things...

Thanks, Aruna
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El 9/11/22 a les 3:06, Aruna Hewapathirane via lazarus ha escrit:

This time it tries to link but dies saying can't find : /usr/bin/ld.bfd: cannot find -lgstreamer-1.0

In debian/ubuntu based distributions you'll have to install the libgstreamer1.0-dev package:

$ apt-file search libgstreamer-1.0
libgstreamer1.0-0: /usr/lib/x86_64-linux-gnu/libgstreamer-1.0.so.0 libgstreamer1.0-0: /usr/lib/x86_64-linux-gnu/libgstreamer-1.0.so.0.1404.0 libgstreamer1.0-0: /usr/lib/x86_64-linux-gnu/libgstreamer-1.0.so.0.1602.0 libgstreamer1.0-0: /usr/lib/x86_64-linux-gnu/libgstreamer-1.0.so.0.1603.0 libgstreamer1.0-dev: /usr/lib/x86_64-linux-gnu/libgstreamer-1.0.so libgstreamer1.0-dev:
/usr/share/gdb/auto-load/usr/lib/x86_64-linux-gnu/libgstreamer-1.0.so.0.1602.0-gdb.py libgstreamer1.0-dev:
/usr/share/gdb/auto-load/usr/lib/x86_64-linux-gnu/libgstreamer-1.0.so.0.1603.0-gdb.py

Bye

It seems you opened the .lpi file as a pascal file using the file - open menu ?

A .lpi file must be opened with project - open menu.

This is a typical error when you do not have the gstreamer1-0-dev package installed.

normally,

sudo apt-get install libgstreamer1.0-dev

will fix this.

Alternatively, you can try to change the code

gstreamerlib = 'libgstreamer-1.0'; {Setup as you need}

to

gstreamerlib = 'libgstreamer-1.0.so.0'; {Setup as you need}

Michael.

On Wed, Nov 9, 2022 at 2:34 AM Luca Olivetti via lazarus <

Ahhh.. ofcourse.. thank you Luca.
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On Wed, Nov 9, 2022 at 3:37 AM Michael Van Canneyt via lazarus <

Oh.. I did not know this thank you. Yes it opens fine now. Screenshot attached.
https://pasteboard.co/6vWHLlaCiYc3.png

I installed gstreamer1.0-dev package and now it compiles. Compiles and builds playmp3 - screenshot attached. https://pasteboard.co/Uq4bM35Ykllu.png

But new problem now. I have attached screenshots.

Errors when trying to play a *.mp3 file:
https://pasteboard.co/xK7PNcnRMZa8.png

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That's an error of gstreamer itself.

At first sight I would say that you are not using pulseaudio on your system, since it seems gstreamer cannot connect to the pulseaudio streamer.

Try changing "pulsesink" with "osssink" or "alsasink" in the gst_parse_launch call.

If none of those help, I'm also at a loss: I am not a gstreamer expert...

Michael.