[alsa-devel] Bug: LADSPA implementation - no up/downmix handling

[Andreas Hartmann]

Am Mittwoch, 23. September 2015, 16:26:58 schrieb Takashi Iwai:
> On Sat, 12 Sep 2015 22:10:40 +0200,
> 
> Andreas Hartmann wrote:
> > Hi,
> > 
> > Using the surround_encoder of the swh-plugins I noticed, that the alsa
> > implementation only assumes an equal number of in- and output channels for
> > ladspa plugins. This occurs from Line 752 onwards in pcm_ladspa.c and
> > leads to a Segfault shortly after.
> > There needs to be a check and correct handling for up/downmix scenarios.
> 
> Could you give the back trace?  Or at best submit a fix patch?
> 
> 
> thanks,
> 
> Takashi
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Sure here you go

#0  0x00007ffff78623ef in snd_pcm_ladspa_allocate_memory (pcm=0x626fa0, 
pcm=0x626fa0, pcm=0x626fa0, ladspa=0x621ad0) at pcm_ladspa.c:753
#1  snd_pcm_ladspa_init (pcm=0x626fa0) at pcm_ladspa.c:834
#2  0x00007ffff7842946 in snd_pcm_plugin_prepare (pcm=0x626fa0) at 
pcm_plugin.c:171
#3  0x00007ffff784290f in snd_pcm_plugin_prepare (pcm=0x62c760) at 
pcm_plugin.c:162
#4  0x000000000040256a in ?? ()
#5  0x00007ffff7222ec5 in __libc_start_main (main=0x401d80, argc=4, 
argv=0x7fffffffde28, init=<optimized out>, fini=<optimized out>, 
rtld_fini=<optimized out>,
    stack_end=0x7fffffffde18) at libc-start.c:287
#6  0x0000000000402fdd in ?? ()
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