Hello,
While investigating an Airtime ticket about ALSA playout failing when a
USB audio interface is disconnected and reconnected:
http://dev.sourcefabric.org/browse/CC-2953
I found mention of a (perhaps) related Liquidsoap feature:
http://dev.sourcefabric.org/browse/LS-388
which enables Liquidsoap to recover after an ALSA error. This does not
seem to work when using Liquidsoap 1.0.1 if the error is due to USB
audio device disconnect/re-connect. Then, I get this error in the console:
Thread 4 killed on uncaught exception Alsa.Device_busy
when using the following test script:
#!/usr/bin/liquidsoap
set("log.file.path","/tmp/usb-disconnect.log")
radio = single("doggfather.ogg")
output.alsa(radio, device="hw:1,0")
where hw:1,0 is the USB audio device. I've attached the log output from
my Ubuntu Lucid test server to this email.
As USB is not a locking connector, this seems a pretty simple way to
screw up your broadcast :-) Is there some way we can have Liquidsoap
tolerate the disconnection/reconnection? Any and all tips would be welcome.
Cheers!
Daniel
2012/08/28 14:05:03 >>> LOG START
2012/08/28 14:05:03 [protocols.external:3] Didn't find "ufetch".
2012/08/28 14:05:03 [protocols.external:3] Found "/usr/bin/wget".
2012/08/28 14:05:03 [main:3] Liquidsoap 1.0.1
2012/08/28 14:05:03 [main:3] Using: graphics=[distributed with Ocaml] pcre=6.0.1 dtools=0.3.0 duppy=0.4.2 duppy.syntax=0.4.2 cry=0.2.2 mm=0.2.0 ogg=0.4.3 vorbis=0.6.1 mad=0.4.4 flac=0.1.1 flac.ogg=0.1.1 dynlink=[distributed with Ocaml] lame=0.3.1 alsa=0.2.1 ao=0.2.0 taglib=0.2.0 camomile=0.7.1 portaudio=0.2.0 pulseaudio=0.1.2
2012/08/28 14:05:03 [dynamic.loader:2] Could not load plugins in directory /usr/local/lib/liquidsoap/1.0.1/plugins.
2012/08/28 14:05:03 [decoder:3] Method "OGG" accepted "doggfather.ogg".
2012/08/28 14:05:03 [single:3] "doggfather.ogg" is static, resolving once for all...
2012/08/28 14:05:03 [frame:3] Using 44100Hz audio, 25Hz video, 44100Hz master.
2012/08/28 14:05:03 [frame:3] Frame size must be a multiple of 1764 ticks = 1764 audio samples = 1 video samples.
2012/08/28 14:05:03 [frame:3] Targetting 'frame.duration': 0.04s = 1764 audio samples = 1764 ticks.
2012/08/28 14:05:03 [frame:3] Frames last 0.04s = 1764 audio samples = 1 video samples = 1764 ticks.
2012/08/28 14:05:03 [threads:3] Created thread "generic queue #1".
2012/08/28 14:05:03 [threads:3] Created thread "generic queue #2".
2012/08/28 14:05:03 [doggfather(dot)ogg:3] Prepared "doggfather.ogg" (RID 0).
2012/08/28 14:05:03 [threads:3] Created thread "alsa_out(hw:1,0)" (1 total).
2012/08/28 14:05:03 [threads:3] Created thread "wallclock_alsa" (2 total).
2012/08/28 14:05:03 [clock.wallclock_alsa:3] Streaming loop starts, synchronized by active sources.
2012/08/28 14:05:03 [alsa_out(hw:1,0):3] Using ALSA 1.0.22.
2012/08/28 14:05:03 [alsa_out(hw:1,0):2] Falling back on interleaved S16LE
2012/08/28 14:05:03 [alsa_out(hw:1,0):3] Samplefreq=44100Hz, Bufsize=262144B, Frame=4B, Periods=1024
2012/08/28 14:05:16 [alsa_out(hw:1,0):2] Alsa error: Device or resource busy
2012/08/28 14:05:16 [threads:1] Thread "alsa_out(hw:1,0)" aborts with exception Alsa error: Device or resource busy!
2012/08/28 14:05:16 [threads:3] Raised by primitive operation at file "", line 0, characters 0-0
2012/08/28 14:05:16 [main:3] Shutdown started!
2012/08/28 14:05:16 [main:3] Waiting for threads to terminate...
2012/08/28 14:05:16 [doggfather(dot)ogg:3] Finished with "doggfather.ogg".
2012/08/28 14:05:16 [clock.wallclock_alsa:3] Streaming loop stopped.
2012/08/28 14:05:16 [threads:3] Thread "wallclock_alsa" terminated (0 remaining).
2012/08/28 14:05:16 [main:3] Cleaning downloaded files...
2012/08/28 14:05:16 >>> LOG END
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