[pulseaudio-discuss] arecord does not work with pulse audio: I/O error
Keedi Kim
keedi.k at gmail.com
Mon Nov 3 20:42:55 PST 2008
Hi,
I just checked ubuntu was applied patch which you mentioned.
> alsa-plugins (1.0.17-0ubuntu5) intrepid-proposed; urgency=low
>
> * debian/patches/pulse_recording_fix.patch: pa_stream_trigger()
> returns
> NULL for capture, so test for it first. Spotted by Takashi Iwai
> and
> acked by Lennart Poettering.
> * LP: #282316 - erratic elapsed time count in "sound recorder"
> https://bugs.launchpad.net/ubuntu/+bug/282316
>
> -- Daniel T Chen <crimsun at ubuntu.com> Mon, 27 Oct 2008 00:14:00
> -0400
and I upgraded to 1.0.17-0ubuntu5,
then -5 I/O error has gone. :-)
but, still there is a problem, and it looks related with pulseaudio
Before using pulseaudio my recording program works well...
I know my source is not good code,
but I want to know, what I have to pay attention
when backend of sound system is pulseaudio?
I use alsa lib to recording from input device,
so I made linux_audio_capture() function.
When I use snd_pcm_readi() function,
the program is aborted or terminated cause of segmentation fault.
> audio_linux_capture()
> -> snd_pcm_readi()
> -> ...(?)...
> -> pulse_poll_activate()
> -> write() <- crash!
gdb tells...
> (gdb) thread 6
> [Switching to thread 6 (Thread 0xb57e9b90 (LWP 11361))]#0 0xb7ff4430 in
__kernel_vsyscall ()
> (gdb) bt
> #0 0xb7ff4430 in __kernel_vsyscall ()
> #1 0xb77d53bb in write () from /lib/tls/i686/cmov/libc.so.6
> #2 0xb4f8d796 in pulse_poll_activate () from
/usr/lib/alsa-lib/libasound_module_pcm_pulse.so
> #3 0xb4f8be8f in ?? () from
/usr/lib/alsa-lib/libasound_module_pcm_pulse.so
> #4 0xb4f8c01d in ?? () from
/usr/lib/alsa-lib/libasound_module_pcm_pulse.so
> #5 0xb78f2201 in ?? () from /usr/lib/libasound.so.2
> #6 0xb78ae0d0 in ?? () from /usr/lib/libasound.so.2
> #7 0xb78f2465 in ?? () from /usr/lib/libasound.so.2
> #8 0xb78a8544 in snd_pcm_readi () from /usr/lib/libasound.so.2
> #9 0x0805e641 in audio_linux_capture (handle=0x979ee00) at
audio_linux.c:720
> #10 0x0805c07c in audio_do_thread_work (data=0x97cd648,
user_data=0xb57e933c) at audio.c:474
> #11 0x0805c1d0 in audio_thread_func (data=0x0) at audio.c:514
> #12 0xb799b02f in ?? () from /usr/lib/libglib-2.0.so.0
> #13 0xb75f350f in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
> #14 0xb77e57ee in clone () from /lib/tls/i686/cmov/libc.so.6
> (gdb)
my audio_linux_capture() function looks like:
> static int
> audio_linux_capture (void *handle)
> {
> AudioLinux *al = handle;
> snd_pcm_uframes_t frames;
> int err, worked;
>
> worked = 0;
>
> if (!al->first)
> {
> /* is it time for reading? */
> err = audio_linux_wait_poll (al);
> if (err < 0)
> {
> if (snd_pcm_state (al->handle) == SND_PCM_STATE_XRUN ||
> snd_pcm_state (al->handle) == SND_PCM_STATE_SUSPENDED)
> {
> err = snd_pcm_state (al->handle) == SND_PCM_STATE_XRUN ?
-EPIPE : -ESTRPIPE;
> if (audio_linux_xrun_recovery (al, err) < 0)
> {
> log_warning (NULL, "write error: %s", snd_strerror
(err));
> return worked;
> }
> al->first = 1;
> }
> else if (snd_pcm_state (al->handle) == SND_PCM_STATE_RUNNING)
> {
> /* nothing to do */
> }
> else
> {
> log_debug (NULL, "failed to wait poll");
> return worked;
> }
> }
>
> /* nothing to do yet */
> if (!err)
> return worked;
> }
>
> al->frame->len = 0;
> al->frame_offset = 0;
>
> capture_loop:
>
> /* read it now */
> if (0) log_debug (NULL, "bytes: %d", err * al->bytes_per_frame);
> err = snd_pcm_readi (al->handle, al->frame->data, frames);
> if (err < 0)
> {
> if (1) log_debug (NULL, "err: %d", err);
> if (audio_linux_xrun_recovery (al, err) < 0)
> {
> if (err != -EAGAIN)
> log_warning (NULL, "failed to read: %s", snd_strerror (err));
> }
> al->first = 1;
> return worked;
> }
>
> if (snd_pcm_state (al->handle) == SND_PCM_STATE_RUNNING)
> al->first = 0;
>
> if (!err)
> return worked;
>
> al->frame->len = err * al->bytes_per_frame;
>
> if (al->capture_callback)
> al->capture_callback (al->frame, al->capture_callback_data);
>
> ++worked;
>
> goto capture_loop;
> }
Thanks,
--
Best Regards,
Keedi Kim
2008/10/17 Colin Guthrie <gmane at colin.guthr.ie>
> Keedi Kim wrote:
> > Hi.
> >
> > I followed PerfectSetup of pulseaudio wiki,
> > then aplay works well, but arecord doesn't.
> > ALSA's arecord terminates with
> > "pcm_read:1473: read error: Input/output error" message.
> >
> > Does anybody has idea?
>
> I know you've said that the package is using 1.0.17 but there is a
> chacne that the Ubuntu package updated the pulse plugin to the latest
> version in git (from the 1.0.18rc3 tree).
>
> If this is the case, then Takashi found a problem with recording via
> alsa with these recently on the alsa Mailing list.
>
> Lennart has yet to ACK this and an earlier message on the Alsa mailing
> list from a couple weeks back (unless he's done so privately to Takashi)
> so I'm guessing he's a little behind on things right now.
>
> In lieu of an ACK from Lennart, it may be worth trying out the patch
> from Takashi.
>
> http://thread.gmane.org/gmane.linux.alsa.devel/56875
>
> I'd also like to know if it works (not had a moment to try yet) so I can
> issue an update package for this.
>
> Col
>
> --
>
> Colin Guthrie
> gmane(at)colin.guthr.ie
> http://colin.guthr.ie/
>
> Day Job:
> Tribalogic Limited [http://www.tribalogic.net/]
> Open Source:
> Mandriva Linux Contributor [http://www.mandriva.com/]
> PulseAudio Hacker [http://www.pulseaudio.org/]
> Trac Hacker [http://trac.edgewall.org/]
>
> _______________________________________________
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> pulseaudio-discuss at mail.0pointer.de
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>
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