On Wed, Aug 1, 2018 at 12:27 AM Georg Chini <georg at chini.tk> wrote: > On 31.07.2018 10:22, Harish Gaddameedi wrote: > > > On Tue, Jul 31, 2018 at 12:42 PM Harish Gaddameedi < > harish.gaddameedi at smartron.com> wrote: > >> On Tue, Jul 31, 2018 at 12:11 PM Harish Gaddameedi < >> harish.gaddameedi at smartron.com> wrote: >> >>> >>> >>> *Please do not top-post. To me it looks like that is an issue in the >>> ALSA driver and not related to pulseaudio. The driver must be reporting the >>> wrong latency. Did you set the loopback latency to* >>> *300 ms? Default is 200 ms.* >>> >>> >>> Sorry, I use default settings, gmail is doing top posting. >>> No, i didn't set any loopback latency. I'll check with the alsa driver >>> and get back to you. >>> >>> -- >>> Thanks, >>> Harish Gaddameedi >>> >> > Hi Georg, > > There is one more important point i wanted to discuss, this is which we > have capture from your reply of clock synchronisation. Can you conform > whether the system clock and audio clock both are same or different? > > > System clock and audio clock need not be equal. Each sound card has its own > clock which might not be synchronized with system clock or wall clock. > Basically, if your sound card claims to run on 44100 Hz, it may be slightly > more or less if measured in "real" (wall clock) time. > module-loopback is normally capable of detecting the clock difference and > adjusts the sink-input sample rate so that the latency remains constant. > This > is why you see in the log, that the module is not using 44100 Hz but in > fact > some other (in your case lower) sample rate. PA then does re-sampling > from that rate to your sound card rate. > > For the A2DP sink (bluetooth headset or speaker) the system clock is used > for timing, so for this special case the audio clock matches system clock. > Hi Georg, I have found some cause for the pulseaudio Latency, can you please look into the below log. During this process of "*alsa-sink.c: Tried rewind, but was apparently not possible*", the latency is coming. Fri Aug 10 11:21:28 2018 user.info pulseaudio[4396]: (50087.559| 0.000) [alsa-sink-I2S cx2072x-dsp-0] alsa-sink.c: Tried rewind, but was apparently not possible. Fri Aug 10 11:21:28 2018 user.debug pulseaudio[4396]: (50087.575| 0.015) [alsa-sink-I2S cx2072x-dsp-0] protocol-native.c: Requesting rewind due to end of underrun. Fri Aug 10 11:21:28 2018 user.debug pulseaudio[4396]: (50087.575| 0.000) [alsa-sink-I2S cx2072x-dsp-0] protocol-native.c: Requesting rewind due to end of underrun. Fri Aug 10 11:21:28 2018 user.debug pulseaudio[4396]: (50087.577| 0.001) [alsa-sink-I2S cx2072x-dsp-0] protocol-native.c: Requesting rewind due to end of underrun. Fri Aug 10 11:21:28 2018 user.debug pulseaudio[4396]: (50087.579| 0.002) [alsa-sink-I2S cx2072x-dsp-0] protocol-native.c: Requesting rewind due to end of underrun. Fri Aug 10 11:21:28 2018 user.debug pulseaudio[4396]: (50087.580| 0.000) [alsa-sink-I2S cx2072x-dsp-0] sink-input.c: Requesting rewind due to uncorking Fri Aug 10 11:21:28 2018 user.debug pulseaudio[4396]: (50087.580| 0.000) [alsa-sink-I2S cx2072x-dsp-0] alsa-sink.c: Requested to rewind 76608 bytes. Fri Aug 10 11:21:28 2018 user.debug pulseaudio[4396]: (50087.580| 0.000) [alsa-sink-I2S cx2072x-dsp-0] alsa-sink.c: Limited to 68288 bytes. Fri Aug 10 11:21:28 2018 user.debug pulseaudio[4396]: (50087.581| 0.000) [alsa-sink-I2S cx2072x-dsp-0] alsa-sink.c: before: 17072 Fri Aug 10 11:21:28 2018 user.debug pulseaudio[4396]: (50087.581| 0.000) [alsa-sink-I2S cx2072x-dsp-0] alsa-sink.c: after: 0 Fri Aug 10 11:21:28 2018 user.info pulseaudio[4396]: (50087.581| 0.000) [alsa-sink-I2S cx2072x-dsp-0] alsa-sink.c: Tried rewind, but was apparently not possible. Fri Aug 10 11:21:31 2018 user.debug pulseaudio[4396]: (50090.231| 2.650) [alsa-sink-I2S cx2072x-dsp-0] sink-input.c: Requesting rewind due to corking Fri Aug 10 11:21:31 2018 user.debug pulseaudio[4396]: (50090.231| 0.000) [alsa-sink-I2S cx2072x-dsp-0] alsa-sink.c: Requested to rewind 76608 bytes. Fri Aug 10 11:21:31 2018 user.debug pulseaudio[4396]: (50090.232| 0.000) [alsa-sink-I2S cx2072x-dsp-0] alsa-sink.c: Limited to 12992 bytes. Fri Aug 10 11:21:31 2018 user.debug pulseaudio[4396]: (50090.232| 0.000) [alsa-sink-I2S cx2072x-dsp-0] alsa-sink.c: before: 3248 Fri Aug 10 11:21:31 2018 user.debug pulseaudio[4396]: (50090.232| 0.000) [alsa-sink-I2S cx2072x-dsp-0] alsa-sink.c: after: 0 Fri Aug 10 11:21:31 2018 user.info pulseaudio[4396]: (50090.232| 0.000) [alsa-sink-I2S cx2072x-dsp-0] alsa-sink.c: Tried rewind, but was apparently not possible. Fri Aug 10 11:21:31 2018 user.debug pulseaudio[4396]: (50090.241| 0.009) [alsa-sink-I2S cx2072x-dsp-0] alsa-sink.c: hwbuf_unused=0 Fri Aug 10 11:21:31 2018 user.debug pulseaudio[4396]: (50090.241| 0.000) [alsa-sink-I2S cx2072x-dsp-0] alsa-sink.c: setting avail_min=18193 Fri Aug 10 11:21:31 2018 user.debug pulseaudio[4396]: (50090.242| 0.000) [alsa-sink-I2S cx2072x-dsp-0] alsa-sink.c: Requested to rewind 76608 bytes. Fri Aug 10 11:21:31 2018 user.debug pulseaudio[4396]: (50090.242| 0.000) [pulseaudio] core.c: Hmm, no streams around, trying to vacuum. Fri Aug 10 11:21:31 2018 user.debug pulseaudio[4396]: (50090.242| 0.000) [alsa-sink-I2S cx2072x-dsp-0] alsa-sink.c: Limited to 12992 bytes. Fri Aug 10 11:21:31 2018 user.debug pulseaudio[4396]: (50090.242| 0.000) [alsa-sink-I2S cx2072x-dsp-0] alsa-sink.c: before: 3248 Fri Aug 10 11:21:31 2018 user.debug pulseaudio[4396]: (50090.242| 0.000) [alsa-sink-I2S cx2072x-dsp-0] alsa-sink.c: after: 0 Fri Aug 10 11:21:31 2018 user.info pulseaudio[4396]: (50090.242| 0.000) [alsa-sink-I2S cx2072x-dsp-0] alsa-sink.c: Tried rewind, but was apparently not possible. *When the below log came, the music played successfully.* Fri Aug 10 11:21:31 2018 user.info pulseaudio[4396]: (50090.243| 0.000) [pulseaudio] sink-input.c: Freeing input 445 "Playback Stream" Fri Aug 10 11:21:31 2018 user.info pulseaudio[4396]: (50090.247| 0.004) [pulseaudio] client.c: Freed 246 "gstreamer_play" Fri Aug 10 11:21:31 2018 user.info pulseaudio[4396]: (50090.247| 0.000) [pulseaudio] protocol-native.c: Connection died. -- Regards, Harish Gaddameedi Software Engineer Mobile: +91- 9246040475 -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://lists.freedesktop.org/archives/pulseaudio-discuss/attachments/20180810/104d82d3/attachment-0001.html>
