Hello Everybody, First of all Congrajulations on the release. Hopefully, we will turn in some patches soon. Please see additional comments inline. > Date: Mon, 26 Sep 2011 20:41:26 +0100 > From: Colin Guthrie <gmane at colin.guthr.ie> > Subject: Re: [pulseaudio-discuss] No audio heard from loopback > To: pulseaudio-discuss at lists.freedesktop.org > Message-ID: <j5qkh2$m66$1 at dough.gmane.org> > Content-Type: text/plain; charset=UTF-8 > > 'Twas brillig, and Sriram Gopalan at 26/09/11 19:35 did gyre and gimble: > > We are facing an issue with loopback in pulse audio 0.9.22 > > Just as a standard approach I'd generally recommend, have you tried > 0.9.23? it includes several fixes that could certainly help. > > If you wait a day, you can also try the shiney new 1.0 release which > will be escaping very soon.... [Sriram] Certainly > > Col > > -- > Date: Mon, 26 Sep 2011 22:02:41 +0200 > From: Maarten Bosmans <mkbosmans at gmail.com> > Subject: Re: [pulseaudio-discuss] No audio heard from loopback > To: General PulseAudio Discussion > ? ? ? ?<pulseaudio-discuss at lists.freedesktop.org> > Message-ID: > ? ? ? ?<CA+CvcKQmQgRcZ5JSjbrKRr8Tzp1ao5trftGiq6DDjANLdQLyUg at mail.gmail.com> > Content-Type: text/plain; charset=UTF-8 > > 2011/9/26 Sriram Gopalan <mgsram at gmail.com>: > > Hello everybody, > > We are facing an issue with loopback in pulse audio 0.9.22. We recently > > ported pulseaudio to an ARM 11 based evaluation board and are running > > pulseaudio in system mode. > > Great. Did you find it easy to get pulse to run, did you need to patch > anything to make it working? If so, please submit upstream. [Sriram] Except for few glitches with the hal-detect module, there was no issue If we develop a patch, we will certainly upstream it. As a matter of fact, looking forward to it. > > > 3) However, when we attempt the followings, it does not work. We cannot hear > > any audio, whereas the same works on my Ubuntu 10.10 desktop > > #arecord | aplay > > Are you saying that this doesn't work, or is the silence expected? Are > you sure you're recording from the alsa hardware card and not from the > pulse virtual alsa device? (I'm sorry for using the wrong terminology > here) [Sriram] silence is not expected. I would expect a ramping up echo. > > > #gst-launch alsasrc ! alsasink > > #pactl load-module module-loopback > > It would be good to know why you want to do this, as in general > (especially on embedded devices) you would not want to use > software-based loopback of the mic input. [Sriram] True. the end goal is to looback 2 different alsa devices for bluetooth functionality. We are using a bluetooth chipset which interfaces with the host micro over I2S. The drivers are integrated under the asoc layer of alsa. If I access the devices directly through alsa ( hw:0,0 and hw:0,1) it works exactly as expected. > > That being said, here are some other things you should try: > - set the resampler to trivial or some speex-integer variant > - try running with PULSE_NO_SIMD=1 set > - try to run the tests of make check and see whether they give a problem [Sriram] Will surely try 1.0 now that it is launched and post the results here :-) > > > With the first 2 commands, there is only silence. With the third option, > > pulse audio dies after sometime with a floating point exception. > > A backtrace would be nice. > (preferably running from git master) > > Maarten > > > ------------------------------ > > Message: 4 > Date: Tue, 27 Sep 2011 07:18:46 +0530 > From: Arun Raghavan <arun.raghavan at collabora.co.uk> > Subject: Re: [pulseaudio-discuss] No audio heard from loopback > To: General PulseAudio Discussion > ? ? ? ?<pulseaudio-discuss at lists.freedesktop.org> > Message-ID: <1317088131.6608.6.camel at snowflake> > Content-Type: text/plain; charset="UTF-8" > > On Tue, 2011-09-27 at 00:05 +0530, Sriram Gopalan wrote: > > Hello everybody, > > We are facing an issue with loopback in pulse audio 0.9.22. We > > recently ported pulseaudio to an ARM 11 based evaluation board and are > > running pulseaudio in system mode. The application being targeted is > > In-vehicle-Infotainment and the board has a Mono Mic ( 16-bit, 1 > > channel) and a Stereo Speaker ( 2 channels, 16-bit, 44.1 Khz). > > > > > > 1) With gstreamer we are able to playback audio to the speakers using > > the following command. pulseaudio promptly gets into action and plays > > the file at 44.1 Khz without a glitch - > > #gst-launch filesrc location=/home/test/songs/test.mp3 ! mad ! > > alsasink > > > > > > 2) When we do a capture with the mic using the command below, again it > > works fine ( By default arecord and aplay use 8Khz, 8-bit mono channel > > for capture and playback) - > > #arecord test.wav > > #aplay test.wav > > > > > > 3) However, when we attempt the followings, it does not work. We > > cannot hear any audio, whereas the same works on my Ubuntu 10.10 > > desktop > > #arecord | aplay > > #gst-launch alsasrc ! alsasink > > #pactl load-module module-loopback > > Incidentally, why are all the tests with alsasrc/alsasink and not > pulsesrc/pulsesink? [Sriram] I will try pulsesrc and pulsesink as well. I have not done that > > -- Arun
