I get same bus error when trying to play two streams using paplay also.<div>I have verified that Its due to 16 Bit write to 32 bit aligned Memory. My main concern is,</div><div>what am I doing wrong in writing two 16Bit samples to simulate 32Bit write.</div> <div><br></div><div>Regards,</div><div>Kuldeep</div><div><br><div class="gmail_quote">On Wed, Aug 17, 2011 at 2:08 PM, kuldeep ghan <span dir="ltr"><<a href="mailto:ghankp@gmail.com" target="_blank">ghankp@gmail.com</a>></span> wrote:<br> <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><br><br><div class="gmail_quote"><div>On Wed, Aug 17, 2011 at 1:51 PM, Arun Raghavan <span dir="ltr"><<a href="mailto:arun.raghavan@collabora.co.uk" target="_blank">arun.raghavan@collabora.co.uk</a>></span> wrote:<br> <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> <div>On Wed, 2011-08-17 at 13:34 +0530, kuldeep ghan wrote:<br> > Hi,<br> ><br> > I am working on a setup which has Linux Kernel running and I have<br> > pulseaudio as Sound server. ASoc Alsa driver snd_pcm_mmap function<br> > returns me<br> > Virtual Memory mapped to physical memory which is strictly 32 Bit<br> > Aligned.<br> <br> </div>Out of curiosity, what platform is this?<br></blockquote></div><div>I am using OMAP4 platform.<br></div><div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> <div><br> > When I am trying to Mix two streams with gst-launch, pa_mix function<br> > tries to write 16Bit mixed samples to this physical memory resulting<br> > in Bus error.<br> ><br> > As a work around I am trying following code which is trying to write<br> > two Mixed 16Bit samples write making it a 32Bit write.<br> > src/pulsecore/sample-util.c<br> ><br> > // *((int16_t*) data) = (int16_t) sum;<br> > if(j==0) {<br> > temp[0]=(int16_t) sum;<br> > j=1;<br> > } else {<br> > temp[1]=(int16_t) sum;<br> > j=0;<br> > sum = ((temp[1] << 16) | (0x0000FFFF &<br> > temp[0]));<br> ><br> > data = (uint8_t*) data - sizeof(int16_t);<br> > *((int32_t*) data) = (int32_t) sum;<br> > data = (uint8_t*) data + sizeof(int16_t);<br> > }<br> ><br> > With this I am able to mix a gst-launch stream and already loaded<br> > sample from pulseaudio played with play-sample from pacmd.<br> > But not able to mix two streams with gst-launch.<br> <br> </div>What is the error you see when playing 2 streams? Do two instances of<br> paplay work fine together?<br></blockquote></div><div>The error I see is <br>"<span>Unhandled</span> <span>fault</span>: external abort on non-linefetch (0x1818) at 0x40013000"<br> </div><div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> <br> BTW, Another potential workaround (if your hardware supports it), is to<br> force the default sample spec to use S32NE samples (you can edit the<br> default value in /etc/pulse/daemon.conf). The downside is obviously that<br> you're transferring 2x the amount of data that you'd have done with<br> S16LE samples and the format conversion cost for just about every<br> client.<br></blockquote></div><div><br>I have tried using S32NE as default format but it Causes under-runs/over-runs.<br>As I am new to ALSA subsystem and PulseAudio I am yet to figure out how to<br>get those under-runs/over-runs solved?<br> </div><div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> <br> Unless there's more hardware out there with this sort of limitation (I<br> don't believe there is), I wouldn't be too keen on adding this sort of<br> workaround upstream.<br> <br> Regards,<br> Arun<br> <br> _______________________________________________<br> pulseaudio-discuss mailing list<br> <a href="mailto:pulseaudio-discuss@lists.freedesktop.org" target="_blank">pulseaudio-discuss@lists.freedesktop.org</a><br> <a href="http://lists.freedesktop.org/mailman/listinfo/pulseaudio-discuss" target="_blank">http://lists.freedesktop.org/mailman/listinfo/pulseaudio-discuss</a><br> </blockquote></div></div><br>Thanks,<br><font color="#888888">Kuldeep<br> </font></blockquote></div><br></div>