[pulseaudio-discuss] PCM Capture Source of usb audio not supported by pulseaudio

[Nazar Mokrynskyi]

> tatic int element_set_switch(pa_alsa_element *e, snd_mixer_t *m, bool b) {
>     snd_mixer_elem_t *me;
>     snd_mixer_selem_id_t *sid;
>     int r;
>
>     pa_assert(m);
>     pa_assert(e);
>
>     SELEM_INIT(sid, e->alsa_name);
>     if (!(me = snd_mixer_find_selem(m, sid))) {
>         pa_log_warn("Element %s seems to have disappeared.", 
> e->alsa_name);
>         return -1;
>     }
>
>     if (e->direction == PA_ALSA_DIRECTION_OUTPUT)
>         r = snd_mixer_selem_set_playback_switch_all(me, b);
>     else
>         r = snd_mixer_selem_set_capture_switch_all(me, b);
>
>     if (r < 0)
>         pa_log_warn("Failed to set switch of %s: %s", e->alsa_name, 
> pa_alsa_strerror(errno));
> +   else
> +      pa_log_dbg("element_set_switch %s dir=%d index=%d ", 
> e->alsa_name, e->direction, b);
>     return r;
> }
>
(   0.094|   0.000) D: [lt-pulseaudio] alsa-mixer.c: Setting 
analog-input-microphone (analog-input-microphone) priority=0
(   0.094|   0.000) D: [lt-pulseaudio] alsa-mixer.c: 
element_set_switch(): e->alsa_name Line
(   0.094|   0.000) D: [lt-pulseaudio] alsa-mixer.c: 
element_set_switch(): e->direction == PA_ALSA_DIRECTION_OUTPUT 28404576
(   0.094|   0.000) D: [lt-pulseaudio] alsa-mixer.c: 
element_set_switch(): b 0
(   0.094|   0.000) D: [lt-pulseaudio] alsa-mixer.c: 
element_set_switch(): me 28912288
(   0.094|   0.000) D: [lt-pulseaudio] alsa-mixer.c: element_set_switch 
Line dir=2 index=0

However, Mic is selected in sound menu.
>
> The pcm capture source seem changed to mic which is index 0
>
> There are some difference between Capture Source of ac97 codec and PCM 
> Capture Source of snd-usb-audio
>
> The source of Ac97 capture source are  cswitch-exclusive , only one 
> cswitch can be on and others are off
>
> Simple mixer control 'Line',0
>   Capabilities: pvolume pswitch pswitch-joined cswitch 
> cswitch-exclusive penum
>   Capture exclusive group: 0
>   Playback channels: Front Left - Front Right
>   Capture channels: Front Left - Front Right
>   Limits: Playback 0 - 31
>   Front Left: Playback 0 [0%] [-34.50dB] [off] Capture [off]
>   Front Right: Playback 0 [0%] [-34.50dB] [off] Capture [off]
>
> Simple mixer control 'Mic',0
>   Capabilities: pvolume pvolume-joined pswitch pswitch-joined cswitch 
> cswitch-exclusive penum
>   Capture exclusive group: 0
>   Playback channels: Mono
>   Capture channels: Front Left - Front Right
>   Limits: Playback 0 - 31
>   Mono: Playback 0 [0%] [-34.50dB] [off]
>   Front Left: Capture [on]
>   Front Right: Capture [on]
>
> static int element_set_volume(pa_alsa_element *e, snd_mixer_t *m, 
> const pa_channel_map *cm, pa_cvolume *v, bool deferred_volume, bool 
> write_to_hw) {
>
>   ...
>
>                            } else {
> -                                if ((r = 
> snd_mixer_selem_set_capture_dB(me, c, value, rounding)) >= 0)
> +                                if ((r = 
> snd_mixer_selem_set_capture_dB(me, c, value, rounding)) >= 0) {
> + pa_log_debug("element_set_volume %s %d dB", e->alsa_name, value);
>                                     r = 
> snd_mixer_selem_get_capture_dB(me, c, &value);
> +                              }
>                             }
>
According to log output element_set_volume() is never called at start, 
only when opening sound UI.
But it goes to other if branch, because of write_to_hw being false.
Here is fresh log of first run after restart: http://pastebin.com/GJyUiraP
Mic was initially selected in UI, but didn't work, then I switched to 
Line and back.

Sincerely, Nazar Mokrynskyi
github.com/nazar-pc
Skype: nazar-pc
Diaspora:nazarpc at diaspora.mokrynskyi.com
Tox: A9D95C9AA5F7A3ED75D83D0292E22ACE84BA40E912185939414475AF28FD2B2A5C8EF5261249


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