Hi,
On 07/09/2012 11:17 AM, Antti Palosaari wrote:
On 07/07/2012 09:53 PM, Hans de Goede wrote:
Hi,
On 07/07/2012 11:00 AM, Antti Palosaari wrote:
Hello Hans,
On 07/07/2012 10:58 AM, Hans de Goede wrote:
So is your device working properly now? The reason I'm asking it
because it is still causing a firmware version warning, and if
it works fine I would like to lower the firmware version warning
point, so that the warning goes away.
I don't know what is definition of properly in that case.
Problem is that when I use radio application from xawtv3 with that new
loopback I hear very often cracks and following errors are printed to
the radio screen:
ALSA lib pcm.c:7339:(snd_pcm_recover) underrun occurred
or
ALSA lib pcm.c:7339:(snd_pcm_recover) overrun occurred
Looks like those does not appear, at least it does not crack so often
nor errors seen, when I use Rhythmbox to tune and "arecord -D hw:2,0
-r96000 -c2 -f S16_LE | aplay -" to listen.
>
I can guess those are not firmware related so warning texts could be
removed.
Actually they may very well be firmware related. At least with my
firmware there
is a bug where actively asking the device for its register contents, it
lets
its audio stream drop.
My patches fix this by waiting for the device to volunteer it register
contents
through its usb interrupt in endpoint, which it does at xx times / sec.
So the first question would be, does this dropping of sound happen
approx 1 / sec
when using radio?
If so this is caused by radio upating the signal strength it displays 1
/ sec. If
you look at radio.c line 981 you will see a
radio_getsignal_n_stereo(fd); call
there in the main loop which gets called 1/sec. Try commenting this out.
If commenting this out fixes your sound issues with radio, then the next
question is are you using my 4 recent si470x patches, if not please
give them a try. If you are already using them then I'm afraid that your
older
firmware may be broken even more then my also not so new firmware.
I suspect these signal strength update pops are different thing. Those are almost so minor you cannot even hear.
I recorded small sample:
http://palosaari.fi/linux/v4l-dvb/xawtv3_radio.m4v
And I am almost 100% sure those cracks are coming ALSA underrun/overrun as error text is seen just same time when crack happens.
The signal updates are what is causing the ALSA under-runs (*), the over-runs are the result of "catching up" after a under-run.
*) Or at least an important cause of them
Commenting out line did not help.
Are you sure about this? Did you do a make after commenting, are you sure you were using the new build to test?
But I think I was also hearing those small pops too and likely new four patches fixes those - but it is hard to say because it cracks audio all time.
One other thing you can try is increasing the buffer size, using:
radio -L 1000
For example will increase it from the 500 millisecs default to 1 second
Regards,
Hans
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