OMG, I figured it out. You have to use not just the -o and backend type, but also -d and the Alsa device. So this web browser URL: http://pbp/cgi-bin/jbe?009864 produces this comand: cmd: '/usr/bin/mpg123 --output alsa -d plughw:1,0,0 "/data/mp3/pink_floyd/1 - Studio Albums/1979 - The Wall/CD 2/Is There Anybody Out There.mp3" ' No, I'm not sending commands over the web, the scanning program makes a file number and puts it in the web pages. When you click a song link it sends that number to the CGI program which also has the list and looks it up. I expect to put it in my collection of stuff on Sourceforge eventually. I want to add a stop button and a queue, maybe other things. pkill mpg123 works for now. On 12/27/20, Alan Corey <alan01346@xxxxxxxxx> wrote: > Well, don't follow those instructions exactly. I did and broke my > alsa, but I think I've been here before, had to manually undo stuff. > This was on a Raspberry Pi before but back in the summer I was doing > nature recordings and using alsa (with aplay and arecord), sox, > Audacity. The Pinebook Pro has about 6 hours battery life even > running a USB soundcard so I was making 1/2 hour recordings by cron > jobs. Using the wall wart it came with gave way too much noise. > > Hans Michlmayr was the guy's name, he was probably in the Outback. > Web site seems to be gone now, he's possibly not still alive. Did a > lot with radio interferometry. You can point an antenna at the sky > and signals get strong and weak. But if you have 2 antennas as far > apart as you can get them, then look at just what's in phase you can > get much higher resolution. As the earth rotates it covers 360 > degrees in one plane, summer-winter tilting gives a different plane. > Signals from over the poles repeat more quickly than those overhead. > You want as much gain as you can manage without feedback, from gain > antennas and amplifier gain, like 100 db,. But you can sweep the sky > and do plots, looking for quasars mostly. There are other radio > sources like Jupiter. People use a pair of satellite TV dishes > pointed up. I was into it 10 years ago, had a pair of antennas out. > Never actually got anything, I was using an IC-7000 and when you turn > the AGC off it mostly goes dead so I was imagining signals where there > weren't any. > > > On 12/26/20, Stuart Longland <stuartl@xxxxxxxxxxxxxxxxxx> wrote: >> On 27/12/20 11:04 am, Alan Corey wrote: >>> Uh-oh, I do have PulseAudio installed, didn't intend to. Using a >>> Daniel Thompson Debian Bullseye on a Piinebook Pro. It's been up less >>> than 4 days. Getting PulseAudio and alsa to coexist is a pain because >>> Pulse wants to break alsa. I did it once following some instructions >>> but I have no reason to keep Pulse. I just tried: >> >> I'm willing to tolerate PulseAudio on my desktop/laptop because it does >> conveniently share the sound card between applications and allows me to >> re-route applications between sound interfaces (something JACK does not >> do well). >> >> I have a Raspberry Pi 3 which spends most of its day with a RTL2832 SDR >> stick plugged in decoding DAB+: I tried PulseAudio there (since it >> insisted on coming along for the ride), but found it just wanted to >> "stutter" its way though, making things unlistenable. >> >> PortAudio applications refused to talk to the on-board sound directly, >> so I wound up using JACK, which is working well enough now. >> >>> cmd: '/usr/bin/mpg123 --output alsa "/data/mp3/pink_floyd/1 - Studio >>> Albums/1979 - The Wall/CD 2/Comfortably Numb.mp3" ' >>> >>> Which I thought I'd tried before, but that was before changing the >>> group. Didn't hear anything but nothing in the Apache error log >>> either. lsof should show the mp3 file open I think. Or maybe ps ax. >>> Could be something in Apache's security but it's calling my CGI >>> program OK. Oh, I'm calling mpg123 from a system() call and not >>> checking the return, I was rushing it. >> >> Easy enough to forget that. Also, beware of command line injection with >> your `system()` calls. An internal trusted network reduces the risk >> quite a bit, but it's worth being paranoid here. >> >>> The eventual machine will probably be a Raspberry Pi that will get >>> used for other things but not at the same time. I like having it on >>> the web (NATed LAN actually) because there are phones, Kindles. >>> computers in the house which could all control it. That part's mostly >>> written, trying to actually hear audio was the last part. I have just >>> over 10k MP3 files, but my loader will scan them and make web pages. >>> In about 1/2 a second on this nvme SSD so it's painless to generate. >>> I'm into writing these recursive directory climbers in c sometimes. >> >> Yep, well, one thing you might run into with a Raspberry Pi… some >> software, notably anything that uses PortAudio (e.g. Audacity), last >> time I tried it a few months back, would _not_ talk to the on-board >> sound interface via ALSA directly. >> >> https://www.raspberrypi.org/forums/viewtopic.php?t=276247#p1750552 >> >> I haven't had the time to debug it further, but it's related to changes >> in the ALSA kernel driver used. Other audio devices like >> `snd-usb-audio` are not affected. >> >> `libao`-based stuff like `mpg123` may be fine. If you're not doing any >> other "audio"-related things, again, you probably don't need PulseAudio. >> If you find your program isn't finding the on-board sound card, JACK >> may work, but then again, I've also never tried that in a CGI context. >> >>> Oh, Australia, land of radio astronomy. I'm ab1jx. Haven't been on >>> the air in 10 years or so but I keep the license up. >> >> Heh, probably not in my neck of the woods (NW Brisbane). You'd never >> hear E.T. over the top of 10000 el cheapo switch-mode wall warts, solar >> inverters, traffic lights and plasma television sets. VHF can be noisy >> too being so close to Mt. Coot-tha: I've accidentally tuned into ABC >> Classic FM with a plain analogue amplifier (yaay for accidental slope >> detection!) more times than I care to count, >> -- >> Stuart Longland (aka Redhatter, VK4MSL) >> >> I haven't lost my mind... >> ...it's backed up on a tape somewhere. >> > > > -- > ------------- > Education is contagious. > -- ------------- Education is contagious. _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
