Hi,
thanks for your work!
@Dan:
Is this patch helpful for you?
Am 03.10.2016 um 17:26 schrieb Bart Massey:
> Package: libmlt6
> Version: 6.2.0-1
> Severity: normal
> Tags: upstream patch
>
> Dear Maintainer,
>
> When using Flowblade or OpenShot to edit videos, trying to
> apply a second LADSPA effect from the swh-tools package to
> an audio stream caused a coredump in MLT's jackrack module.
>
> After some debugging, this proved to be lack of a null
> pointer check in jackrack: the null pointer was unexpected,
> since it corresponded to the LADSPA plugin having been
> incorrectly loaded.
>
> After fixing MLT jackrack to not dump core and fixing up the
> logging, the problem with LADSPA loading was traced to
> unnecessarily using RTLD_GLOBAL in the dlopen() call for the
> LADSPA plugin in one of two locations where the plugin was
> opened. This (for some reason I don't understand) prevented
> the swh_init constructor for the LADSPA plugin from being
> called at load time, which in turn caused the plugin to
> fail to be configured properly.
>
> With RTLD_GLOBAL removed, MLT worked as expected. Flowblade
> applied multiple swh-plugins LADSPA effects to an audio
> track successfully.
>
> This patch cleans up the debug logging for MLT jackrack,
> prevents a coredump in the case that a LADSPA plugin reports
> no configuration, and removes the offending RTLD_GLOBAL.
>
> diff -ru /usr/src/mlt-6.2.0/src/modules/jackrack/jack_rack.c
> ./src/modules/jackrack/jack_rack.c
> --- /usr/src/mlt-6.2.0/src/modules/jackrack/jack_rack.c 2016-04-20
> 19:24:55.000000000 -0700
> +++ ./src/modules/jackrack/jack_rack.c 2016-10-02 16:01:44.000000000
> -0700
> @@ -103,7 +103,11 @@
> {
> plugin_t * plugin = jack_rack_instantiate_plugin (jack_rack,
> saved_plugin->settings->desc);
> if (!plugin)
> - return;
> + {
> + mlt_log_warning( NULL, "%s: could not instantiate object file '%s'\n",
> + __FUNCTION__,
> saved_plugin->settings->desc->object_file);
> + return;
> + }
> jack_rack->saved_plugins = g_slist_append (jack_rack->saved_plugins,
> saved_plugin);
> process_add_plugin (jack_rack->procinfo, plugin);
> jack_rack_add_plugin (jack_rack, plugin);
> diff -ru /usr/src/mlt-6.2.0/src/modules/jackrack/plugin.c
> ./src/modules/jackrack/plugin.c
> --- /usr/src/mlt-6.2.0/src/modules/jackrack/plugin.c 2016-04-20
> 19:24:55.000000000 -0700
> +++ ./src/modules/jackrack/plugin.c 2016-10-03 07:53:19.000000000 -0700
> @@ -287,26 +287,35 @@
> void * dl_handle;
> const char * dlerr;
> LADSPA_Descriptor_Function get_descriptor;
> -
> +
> + /* clear the error report */
> + dlerror ();
> +
> /* open the object file */
> +#if 0
> dl_handle = dlopen (desc->object_file, RTLD_NOW|RTLD_GLOBAL);
> - if (!dl_handle)
> +#else
> + dl_handle = dlopen (desc->object_file, RTLD_NOW);
> +#endif
> + dlerr = dlerror ();
> + if (!dl_handle || dlerr)
> {
> + if (!dlerr)
> + dlerr = "unknown error";
> mlt_log_warning( NULL, "%s: error opening shared object file '%s':
> %s\n",
> - __FUNCTION__, desc->object_file, dlerror());
> + __FUNCTION__, desc->object_file, dlerr);
> return 1;
> }
>
>
> /* get the get_descriptor function */
> - dlerror (); /* clear the error report */
> -
> get_descriptor = (LADSPA_Descriptor_Function)
> dlsym (dl_handle, "ladspa_descriptor");
> -
> dlerr = dlerror();
> if (dlerr)
> {
> + if (!dlerr)
> + dlerr = "unknown error";
> mlt_log_warning( NULL, "%s: error finding descriptor symbol in object
> file '%s': %s\n",
> __FUNCTION__, desc->object_file, dlerr);
> dlclose (dl_handle);
> @@ -321,6 +330,13 @@
> #endif
>
> *descriptor_ptr = get_descriptor (desc->index);
> + if (!*descriptor_ptr)
> + {
> + mlt_log_warning( NULL, "%s: error finding index %lu in object file
> '%s'\n",
> + __FUNCTION__, desc->index, desc->object_file);
> + dlclose (dl_handle);
> + return 1;
> + }
> *dl_handle_ptr = dl_handle;
>
> return 0;
> diff -ru /usr/src/mlt-6.2.0/src/modules/jackrack/plugin_mgr.c
> ./src/modules/jackrack/plugin_mgr.c
> --- /usr/src/mlt-6.2.0/src/modules/jackrack/plugin_mgr.c 2016-04-20
> 19:24:55.000000000 -0700
> +++ ./src/modules/jackrack/plugin_mgr.c 2016-10-03 07:53:19.000000000
> -0700
> @@ -147,7 +147,7 @@
> plugin_mgr->plugin_count++;
>
> /* print in the splash screen */
> - /* mlt_log_verbose( NULL, "Loaded plugin '%s'\n", desc->name); */
> + mlt_log_verbose( NULL, "Loaded plugin '%s'\n", desc->name);
> }
>
> err = dlclose (dl_handle);
>
>
>
> -- System Information:
> Debian Release: stretch/sid
> APT prefers unstable
> APT policy: (900, 'unstable'), (400, 'oldoldstable'), (400, 'testing'),
> (400, 'stable'), (400, 'oldstable')
> Architecture: amd64 (x86_64)
> Foreign Architectures: i386
>
> Kernel: Linux 4.6.0-1-amd64 (SMP w/8 CPU cores)
> Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
> Shell: /bin/sh linked to /bin/dash
> Init: systemd (via /run/systemd/system)
>
> Versions of packages libmlt6 depends on:
> ii libavcodec57 7:3.1.3-1+b3
> ii libavdevice57 7:3.1.3-1+b3
> ii libavfilter6 7:3.1.3-1+b3
> ii libavformat57 7:3.1.3-1+b3
> ii libavutil55 7:3.1.3-1+b3
> ii libc6 2.24-3
> ii libepoxy0 1.3.1-1
> ii libexif12 0.6.21-2
> ii libfftw3-double3 3.3.4-2+b2
> ii libgcc1 1:6.2.0-5
> ii libgdk-pixbuf2.0-0 2.36.0-1
> ii libgl1-mesa-glx [libgl1] 12.0.3-1
> ii libglib2.0-0 2.50.0-1
> ii libgtk2.0-0 2.24.31-1
> ii libjack-jackd2-0 [libjack-0.116] 1.9.10+20150825git1ed50c92~dfsg-2
> ii libmlt++3 6.2.0-1
> ii libmovit4 1.3.2-1
> ii libpango-1.0-0 1.40.3-2
> ii libpangoft2-1.0-0 1.40.3-2
> ii libqt4-opengl 4:4.8.7+dfsg-9
> ii libqt4-svg 4:4.8.7+dfsg-9
> ii libqt4-xml 4:4.8.7+dfsg-9
> ii libqtcore4 4:4.8.7+dfsg-9
> ii libqtgui4 4:4.8.7+dfsg-9
> ii librtaudio5a 4.1.2~ds0-4
> ii libsamplerate0 0.1.8-8
> ii libsdl1.2debian 1.2.15+dfsg1-4
> ii libsox2 14.4.1-5+b1
> ii libstdc++6 6.2.0-5
> ii libswscale4 7:3.1.3-1+b3
> ii libx11-6 2:1.6.3-1
> ii libxml2 2.9.4+dfsg1-2
>
> Versions of packages libmlt6 recommends:
> ii libmlt-data 6.2.0-1
>
> libmlt6 suggests no packages.
>
> -- no debconf information
>
--
/*
Mit freundlichem Gruß / With kind regards,
Patrick Matthäi
GNU/Linux Debian Developer
Blog: http://www.linux-dev.org/
E-Mail: pmatth...@debian.org
patr...@linux-dev.org
*/
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