----- Original Message ----- > 'Twas brillig, and Nasa at 07/08/11 21:26 did gyre and gimble: > > Hi, > > > > I was hoping I could get some help troubleshooting some audio > > quality issues I am running into. > > Specifically, I am getting a lot of *pops/crackles* when I play > > audio files. It shows up when I > > move from 2-channel to 4/5 channel audio (via pauvcontrol) - I am > > using a USB X-FI sound-card with > > the Meego IVI. > > > > I have tried changing the resample method (going from ffmpeg to > > high-quality) and setting tsched=0, > > neither making any noticeable difference. > > > > The only things I saw in /var/log/messages that seemed relevant was: > > messages:Aug 6 16:59:26 localhost pulseaudio[570]: alsa-sink.c: ALSA > > woke us up to write new data to the device, but there was actually > > nothing to write! > > messages:Aug 6 16:59:26 localhost pulseaudio[570]: alsa-sink.c: Most > > likely this is a bug in the ALSA driver 'snd_usb_audio'. Please > > report this issue to the ALSA developers. > > messages:Aug 6 16:59:26 localhost pulseaudio[570]: alsa-sink.c: We > > were woken up with POLLOUT set -- however a subsequent > > snd_pcm_avail() returned 0 or another value < min_avail. > > > > And this was spout out of dmesg > > [ 21.857184] ALSA sound/usb/mixer.c:2110: status interrupt: c0 00 > > [ 21.897058] ALSA sound/usb/mixer.c:2110: status interrupt: c0 00 > > [ 21.961062] ALSA sound/usb/mixer.c:2110: status interrupt: c0 00 > > > > I have already eliminated the speakers and the amp (played music > > from a different source and > > they sounded fine). > > > > Let me know what else I should post (I could record the sound, if > > that would be useful). > > > > Thanks in advance, > > While this could be an issue in the alsa driver itself, can I ask if > you're applying any volume changes to your streams or sink? > I personally am not, however, the meego project maybe. There are over 250 patches against the base pulseaudio package (9.22) of which some seem to have something to do with volume settings... 0249-bluetooth-Fix-HSP-volume-handling.patch 0248-bluetooth-restore-original-sco_-sink-src-set_volume-.patch 0247-bluetooth-fix-set_volume_cb-on-sco-over-pcm.patch 0240-volume-proxy-small-lib-to-allow-communicating-volume.patch 0224-pactl-Accept-more-volume-specification-formats.patch 0223-sink-input-Add-volume_writable-to-pa_sink_input.patch 0190-alsa-mixer-Refactoring-merge-element_mute_volume-ele.patch 0189-alsa-mixer-Implement-constant-volume.patch 0140-dbus-Always-accept-mono-volumes-when-setting-device-.patch 0133-volume-Add-Orc-based-optimised-volume-scaling.patch 0132-volume-Fix-sample-array-size-for-tests.patch 0131-volume-Make-tests-use-only-valid-volumes.patch 0130-alsa-mixer-Fix-a-git-am-cockup-in-b0f72311.patch 0129-volume-Add-a-PA_VOLUME_UI_MAX-define-for-the-recomme.patch 0124-introspect-Client-side-implementation-for-has_volume.patch 0118-Revert-Add-volume-ramping-feature-envelop-fix.patch 0117-Revert-Add-volume-ramping-feature-sink-input-modific.patch 0116-Revert-Add-volume-ramping-feature-sink-modification.patch 0114-Revert-core-volume-ramping-fix.patch 0107-virtual-sink-Add-a-modarg-for-forcing-flat-volume.patch 0106-virtual-sink-Add-a-modarg-for-enabling-volume-sharin.patch 0105-Implement-the-volume-sharing-feature.patch 0090-Allow-read-only-or-non-existing-sink-input-volume.patch 0042-core-Use-volume_change_safety_margin-when-rewinding-.patch 0022-volume-Trivial-cosmetics-remove-a-space.patch 0011-alsa-sink-take-base-volume-into-account-when-applyin.patch 0001-volume-Add-explicit-checks-for-ARMv6-instructions.patch 0001-fix-the-assumption-that-volume-is-always-positive.patch So can see all the patches and what's in them here: https://build.pub.meego.com/package/files?package=Pulseaudio&project=home%3Anasa (not that I'm expecting and/or requesting you do that -- I just put this here for reference) Nasa BTW: I will try your suggestion when I get home this evening. > There could be a problem with optimized paths for software volume > adjustments. You can disable these optimisations via a special > environment var: PULSE_NO_SIMD=1 > > It's worth checking this to see if it's that area that's at fault. > > Col > > ------------------------------------------------------------------------------ BlackBerry® DevCon Americas, Oct. 18-20, San Francisco, CA The must-attend event for mobile developers. Connect with experts. Get tools for creating Super Apps. See the latest technologies. Sessions, hands-on labs, demos & much more. Register early & save! http://p.sf.net/sfu/rim-blackberry-1 _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
