Am 19.03.23 um 18:49 schrieb BALATON Zoltan:
On Sun, 12 Mar 2023, Volker Rümelin wrote:
Am 12.03.23 um 15:09 schrieb Rene Engel:
Tested with -audiodev coreaudio,id=audio0,out.buffer-count=1 to 12
1 is too slow the rest up to 12 has no effect
The sampling frequency of the via-ac97 driver is 48000 Hz under
AmigaOs4.1
Any other ideas?
In audio/audio_template.h in the AUD_open_ functions there is one
ldebug ("open %s, freq %d, nchannels %d, fmt %d\n",
name, as->freq, as->nchannels, as->fmt);
line. Please replace this line with
fprintf(stderr, "open %s, freq %d, nchannels %d, fmt %d\n",
name, as->freq, as->nchannels, as->fmt);
compile and start AmigaOS. Use the default out.buffer-count. I would like
to know the via-ac97 drivers idea of the sampling frequency.
Not sure this helps but I get these with DEBUG enabled in qemu/audio on
Linux host with alsa set to 44100 Hz dmix rate with default settings
without any -audiodev options with AmigaOS guest.
With pegasos2:
audio: open via-ac97.out, freq 44100, nchannels 1, fmt 1##############] 100
%
audio: open via-ac97.out, freq 44100, nchannels 2, fmt 3
alsa: enabling voice
alsa: disabling voice
alsa: alsa_fini
or pegasos2 with ES1370:
audio: open via-ac97.out, freq 44100, nchannels 2, fmt 3
alsa: enabling voice
alsa: disabling voice
alsa: alsa_fini
this does not play as slow as with sam460ex below but maybe a bit slow
which seems to improve with try-poll=off so this may be because of the alsa
backend issue. It's a bit faster with sdl backend, not sure if that's the
right speed or too fast but at least the backend seems to influence
playback speed.
Hi,
I still don't understand how the playback speed can slow down without
changing the pitch.
With sam460ex and ES1370:
audio: open es1370.dac2, freq 44100, nchannels 1, fmt 0
audio: open es1370.adc, freq 44100, nchannels 1, fmt 0
audio: open es1370.dac2, freq 48662, nchannels 1, fmt 0
audio: open es1370.adc, freq 48662, nchannels 1, fmt 0
audio: open es1370.dac2, freq 48662, nchannels 2, fmt 3
alsa: enabling voice
alsa: disabling voice
alsa: alsa_fini
this plays definitely slow and the freq also seems to be off. I may have
different AmigaOS versions on pegasos2 and sam460ex but I they seem to use
the same driver as there were no updates to that part. I'm not sure what
the driver in AmigaOS looks like but it may be similar to the AROS AHI
SB128 one. I don't know if higher level parts in AHI may try to measure
something like you mentioned but at least the card driver does not seem to
do that.
I had a look at the AROS SB128 driver and the AHI Preferences code. There is
no code to measure the audio clock frequency. The frequency selection of
48662Hz seems to be a AROS/AmigaOS bug. This log is from a AROS x86 guest. I
hear some faint static noise but the playback speed is correct.
open pcspk, freq 32000, nchannels 1, fmt 0
open es1370.dac2, freq 44100, nchannels 1, fmt 0
open es1370.adc, freq 44100, nchannels 1, fmt 0
open es1370.dac2, freq 48662, nchannels 1, fmt 0
open es1370.adc, freq 48662, nchannels 1, fmt 0
open es1370.dac2, freq 48662, nchannels 2, fmt 3
open es1370.dac2, freq 44100, nchannels 2, fmt 3
open es1370.adc, freq 44100, nchannels 1, fmt 0