On Mon, Dec 7, 2015 at 4:41 AM, arnaud.mouiche@xxxxxxxxxxx <arnaud.mouiche@xxxxxxxxxxx> wrote: > > Hi all. > > Yes, Caleb and I are working on issues when dealing with N channels, N > 2, but everyone can experience those issues with N=2. > It is true that a Left/Right switching on audio in not tragic for most users, but I think is will be good if this kind of channel switch can be definitely fixed by the patches I propose. > > Here is a very basic test to demonstrate a 2 channels classical scenario that everyone can experience on a imx6 SOC. > > #!/bin/sh > > amixer set PCM 100%,0% > arecord -D hw:0,0 -c 2 -r 48000 -f S16_LE /tmp/foo.wav </dev/null & > pid=$! > speaker-test -t sine -D hw:0,0 -r 48000 -c 2 -l 1 > kill $pid > > what is done: > - Right channel is muted at the codec level (so if we try to play something on the right channel only, nothing is heard). > - We start recording (arecord) > - then we start a tone generation (speaker-test), starting by the left channel during few first seconds. > > what is expected: > - We should hear the tone on left channel right after speaker-test starts. > > what is experienced: > - 50% of the time, we don't here anything, until speaker-test switch to the right meaning Left and Right channels are switched. > > Regards, > Arnaud > Since I haven't been testing with channels==2, I never noticed that the problem was very common even with 2 channels! Yikes. I've been delayed in working on your patch set. I hope to get to it soon, but other deadlines are looming, so I might have to wait for the new year to put it together. Thanks so much for the patches, I'm really looking forward to finally having a robust MX6 driver. -Caleb _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
