Created attachment 99905 [details] my asoundrc including the rl-crossover (As requested in the faq, i mention this bug occured on Kubuntu, but it was reproduced by an user of #alsa on Debian) I've created a Linkwitz-Riley-crossover (4th order) in .asoundrc for upmixing 2.0->2.1 (see attached .asoundrc). The crossover works great with aplay or with vlc when selected as alsa output device. I can load any pcm from .asoundrc as alsa-sink, as long as there's no ladspa-filter in the signal chain. But when i do pactl load-module module-alsa-sink device=upmixplug, it fails with: I: [pulseaudio] client.c: Created 7 "Native client (UNIX socket client)" D: [pulseaudio] protocol-native.c: Protocol version: remote 28, local 28 I: [pulseaudio] protocol-native.c: Got credentials: uid=1000 gid=1000 success=1 D: [pulseaudio] protocol-native.c: SHM possible: yes D: [pulseaudio] protocol-native.c: Negotiated SHM: yes D: [pulseaudio] module-augment-properties.c: Looking for .desktop file for pactl D: [pulseaudio] alsa-util.c: Trying upmixplug with SND_PCM_NO_AUTO_FORMAT ... D: [pulseaudio] alsa-util.c: Managed to open upmixplug I: [pulseaudio] (alsa-lib)pcm_params.c: Slave PCM not usable D: [pulseaudio] alsa-util.c: snd_pcm_hw_params_any() failed: Invalid argument D: [pulseaudio] alsa-util.c: Trying upmixplug without SND_PCM_NO_AUTO_FORMAT ... D: [pulseaudio] alsa-util.c: Managed to open upmixplug I: [pulseaudio] (alsa-lib)pcm_params.c: Slave PCM not usable D: [pulseaudio] alsa-util.c: snd_pcm_hw_params_any() failed: Invalid argument D: [pulseaudio] alsa-util.c: Trying plug:upmixplug with SND_PCM_NO_AUTO_FORMAT ... D: [pulseaudio] alsa-util.c: Managed to open plug:upmixplug I: [pulseaudio] (alsa-lib)pcm_params.c: Slave PCM not usable I: [pulseaudio] (alsa-lib)pcm_params.c: Slave PCM not usable D: [pulseaudio] alsa-util.c: snd_pcm_hw_params_any() failed: Invalid argument D: [pulseaudio] alsa-util.c: Trying plug:upmixplug without SND_PCM_NO_AUTO_FORMAT ... D: [pulseaudio] alsa-util.c: Managed to open plug:upmixplug I: [pulseaudio] (alsa-lib)pcm_params.c: Slave PCM not usable I: [pulseaudio] (alsa-lib)pcm_params.c: Slave PCM not usable D: [pulseaudio] alsa-util.c: snd_pcm_hw_params_any() failed: Invalid argument I: [pulseaudio] alsa-util.c: Failed to set hardware parameters on plug:upmixplug: Invalid argument E: [pulseaudio] module.c: Failed to load module "module-alsa-sink" (argument: "device=upmixplug"): initialization failed. D: [pulseaudio] module-udev-detect.c: /dev/snd/controlC0 is accessible: yes I: [pulseaudio] client.c: Freed 7 "pactl" I: [pulseaudio] protocol-native.c: Connection died. I get the same result with any other pcm from .asoundrc when a ladspa-filter is in the signal chain. Before trying to load a sink, i've always unloaded the soundcard (D2X) from PA to avoid any chance of a collision.
D: [pulseaudio] alsa-util.c: Trying upmixplug with SND_PCM_NO_AUTO_FORMAT ... this mean pulseaudio disable the format conversion of plug plugin from s16_le to float
how about aplay -v --disable-format -D upmixplug foo.wav I: [pulseaudio] (alsa-lib)pcm_params.c: Slave PCM not usable for error message you need to complie alsa-lib with #if 1 #define RULES_DEBUG #endif in alsa-lib/src/pcm/pcm_params.c seem err in sprepare err = sprepare(pcm, &sparams); if (err < 0) { SNDERR("Slave PCM not usable"); return err; }
your error messages are similar to surround41 and surround50 https://bugs.freedesktop.org/attachment.cgi?id=87935
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