[gst-devel] Sound only once

Bernd Muent Bernd.Muent at euroscript.de
Wed Dec 14 04:49:03 CET 2005

Andy Wingo schrieb:

>>My code (linked to gstreamer-0.8):
> There is a new release out

I know. But I think that a pkgconfig-check against 0.8 is absolutely 
enough to play a simple sound. I don't want to force the users to 
install a newer version.

>>#include <gst/gst.h>
>>GstElement *bin,*filesrc,*decoder,*osssink;
> you sure these are initialized to NULL?

All right. I added this.

>>void playSound(char *fileName) {
>>         if (bin!=NULL)
>>             gst_element_set_state(GST_ELEMENT(bin),GST_STATE_NULL);
> you should unref the old pipeline, if any, here

Something like that?

> if it's for a game, why mp3? vorbis is better and is free

OK, but this is not the problem. The sound is played once.
>>         if (!decoder) return;
>>         osssink = gst_element_factory_make("osssink",
>>                                            "play_audio");
>>         if (!osssink) return;
>>         gst_bin_add_many(GST_BIN(bin),filesrc,decoder,osssink,NULL);
>>         gst_element_link_many(filesrc,decoder,osssink,NULL);
>>         gst_element_set_state(bin,GST_STATE_PLAYING);
> you're not iterating the pipeline, dunno how it plays the first time ;)

I hear it one time.
The sound is only approx. 0.2 sec. and I like to play it asnycronous in 
thebackground without stopping the game.

I found out another thing. When my prog is running (and has played the 
sound), a test with gstreamer-properties fails for oss-sound-system. The 
error message is in German "Weiterleitung nicht möglich" (something like 
"not able to forward message".
When I terminate my program, the test runs well.
So my conclusion: Something is blocked after first playing the sound but 
I don't know what.
I added code like:

but it's still the same problem.

Is there anybody who can post a simple working(!) example for playing a 
sound file more than once?

Greetings from Berlin, Bernd

Bernd Münt                   Durchwahl: 030/69032-509
euroscript Deutschland GmbH  Zentrale:  030/69032-300
Abteilung IT-Management      Fax:       030/69032-505
Alt-Moabit 91                Mail:      Bernd.Muent at euroscript.de
10559 Berlin                 Web:       http://www.euroscript.de

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