Devin Heitmueller <dheitmueller@xxxxxxxxxxxxxx> wrote: > > When I use this command simultaneously: > > arecord -D front:CARD=PAL,DEV=0 -f S16_LE -c 2 -r 8000 /aux/tmp/bla.wav > > I get correct audio with strong noise: > > http://www.wgboome.de./bla.wav > > (it is from input=1 for copyright reasons... so there is silence plus noise) > > The "-r" argument should almost certainly be 48000, not 8000. > Maybe... That device is rather old... And i didnt tell pactl anything about sample rate... With the filter from the appendix the noise is gone... But it feels like a dirty hack, because it would cut out (overly?) loud noise, 2... My wild guess is, that the usbaudio driver injects some bad samples (0x8000..0x9000) every appr. 256 bytes... -Arne appendix: #include <stdint.h> #include <unistd.h> int main() { uint16_t buf[1000000]; const int r = read(0,buf,sizeof(buf)); for (int i=0; i*sizeof(*buf)<r; i++) { if (buf[i]/256>=0x80 && buf[i]/256<0x90) continue; if (write(1,buf+i,2) != 2) break; } return 0; } -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
