This is just a theory, but are the two sound cards
synchronized to the same oscillating timing crystal?
When using multiple sound cards, the crystals that
provide the timing for the oscillator on each card are
within an acceptable range, but not exact. This is
why RME provides "add-on" cards to their Hammerfall
product line; each add-on cards uses the crystal and
oscillator on the main card that connects to the PCI
bus.
There is some documentation regarding a hardware hack
for using multiple sound cards. The idea of the hack
is simple: remove/disable/bypass the crystal on all
sound cards but one, then use some sort of jumper
connection from each card to use the crystal on one
card. Put the term "synchronizing sound cards" into
your favorite search engine to find out more about
this.
As I said before, this is just a theory.
-=cybersean3000=-
--- Bery Rinaldo <ecasound@email-addr-hidden> wrote:
> Hello,
>
> I'm new to the list, so please forgive any
> newbie-ness ;-). I have two
> M-Audio Delta 1010LTs installed in a PIII-550MHz PC
> running Fedora Core
> 4. FC4 recognized the cards after installation and
> I am able to record
> from the two cards in separate chains as follows:
>
> ecasound -t:10 \
> -a:1 -f:16,8,44100 -i:alsa,analog8_1 -o:ana8_1.wav
> \
> -a:2 -f:16,8,44100 -i:alsa,analog8_2 -o:ana8_2.wav
>
> I am trying to use the "multi" feature of ALSA with
> ecasound to record
> all 16 analog channels of the two cards but get
> overrun errors when
> running this command:
>
> ecasound -t:10 \
> -a:1 -f:16,16,44100 -i:alsa,all16 \
> -a:1 -o:all16.wav
>
> Here's the output:
>
> # sh -x doit16_16
> + ecasound -t:10 -a:1 -f:16,16,44100 -i:alsa,all16
> -a:1 -o:all16.wav
>
********************************************************************************
> * ecasound v2.4.3 (C) 1997-2005 Kai Vehmanen
> and others
>
********************************************************************************
> - [ Session created ]
>
----------------------------------------------------------
> - [ Chainsetup created (cmdline) ]
> ---------------------------------------------
> (eca-chainsetup-parser) Set processing time to
> 10.00.
> - [ Connecting chainsetup ]
> ----------------------------------------------------
> (eca-chainsetup) 'rt' buffering mode selected.
> (eca-chainsetup) Audio object "alsa", mode "read".
> (audio-io) Format: s16_le, channels 16, srate 44100,
> interleaved.
> (eca-chainsetup) Audio object "all16.wav", mode
> "read/write".
> (audio-io) Format: s16_le, channels 16, srate 44100,
> interleaved.
> - [ Chainsetup connected ]
>
-----------------------------------------------------
> (eca-control-objects) Connected chainsetup:
> "command-line-setup".
> - [ Controller/Starting batch processing ]
> -------------------------------------
> - [ Engine init - Driver start ]
> -----------------------------------------------
> (eca-engine) Using realtime-scheduling
> (SCHED_FIFO:50).
> Unknown device state '3'
> ... (repeats many times)
> Unknown device state '3'
> (audioio-db-client) WARNING: Overrun in writing to
> "all16.wav". Trying
> to recover.
> Unknown device state '3'
> ...
> Unknown device state '3'
> (audioio-db-client) WARNING: Overrun in writing to
> "all16.wav". Trying
> to recover.
> warning! playback overrun - samples lost! Break was
> at least 113.20 ms
> long.
> Unknown device state '3'
> ...
> Unknown device state '3'
> (audioio-db-client) WARNING: Overrun in writing to
> "all16.wav". Trying
> to recover.
> warning! playback overrun - samples lost! Break was
> at least 43.28 ms long.
> Unknown device state '3'
> ...
> Unknown device state '3'
> (audioio-db-client) WARNING: Overrun in writing to
> "all16.wav". Trying
> to recover.
> warning! playback overrun - samples lost! Break was
> at least 43.39 ms long.
> Unknown device state '3'
> ...
> Unknown device state '3'
> - [ Controller/Batch processing finished ]
> -------------------------------------
> (eca-control-objects) Disconnecting chainsetup:
> "command-line-setup".
> - [ Chainsetup disconnected ]
> --------------------------------------------------
> WARNING! While reading from ALSA-pcm device C0D0,
> there were 3 overruns.
> (audioio-db-client) There were total 4 xruns.
> #
>
> I've experimented with the asound.conf file to try
> just capturing from
> one channel each card (see "pcm.some") but get the
> same sorts of
> messages. FYI, here is my /etc/asound.conf file:
>
> pcm.ice1712_1 {
> type hw
> card 1
> device 0
> }
>
> pcm.analog8_1 {
> type plug
> ttable.0.0 1
> ttable.1.1 1
> ttable.2.2 1
> ttable.3.3 1
> ttable.4.4 1
> ttable.5.5 1
> ttable.6.6 1
> ttable.7.7 1
> slave.pcm ice1712_1
> }
>
> #SPDIF channels only
> pcm.spdif_1 {
> type plug
> ttable.0.8 1
> ttable.1.9 1
> slave.pcm ice1712_1
> }
>
> pcm.ice1712_2 {
> type hw
> card 2
> device 0
> }
>
> pcm.analog8_2 {
> type plug
> ttable.0.0 1
> ttable.1.1 1
> ttable.2.2 1
> ttable.3.3 1
> ttable.4.4 1
> ttable.5.5 1
> ttable.6.6 1
> ttable.7.7 1
> slave.pcm ice1712_2
> }
>
> #SPDIF channels only
> pcm.spdif_2 {
> type plug
> ttable.0.8 1
> ttable.1.9 1
> slave.pcm ice1712_2
> }
>
> #Combine all 16 analog channels from both cards
> pcm.all16 {
> type multi;
> slaves.a.pcm analog8_1;
> slaves.a.channels 8;
> slaves.b.pcm analog8_2;
> slaves.b.channels 8;
> bindings.0.slave a;
> bindings.0.channel 0;
> bindings.1.slave a;
> bindings.1.channel 1;
> bindings.2.slave a;
> bindings.2.channel 2;
> bindings.3.slave a;
> bindings.3.channel 3;
> bindings.4.slave a;
> bindings.4.channel 4;
> bindings.5.slave a;
> bindings.5.channel 5;
> bindings.6.slave a;
> bindings.6.channel 6;
> bindings.7.slave a;
> bindings.7.channel 7;
> bindings.8.slave b;
> bindings.8.channel 0;
> bindings.9.slave b;
> bindings.9.channel 1;
> bindings.10.slave b;
> bindings.10.channel 2;
> bindings.11.slave b;
> bindings.11.channel 3;
> bindings.12.slave b;
> bindings.12.channel 4;
> bindings.13.slave b;
> bindings.13.channel 5;
> bindings.14.slave b;
> bindings.14.channel 6;
> bindings.15.slave b;
> bindings.15.channel 7;
> }
>
> ctl.all16 {
> type hw;
> card 1;
> }
>
> pcm.ttable {
> type route;
> slave.pcm "all16";
> ttable.0.0 1;
> ttable.1.1 1;
> ttable.2.2 1;
> ttable.3.3 1;
> ttable.4.4 1;
> ttable.5.5 1;
> ttable.6.6 1;
> ttable.7.7 1;
> ttable.8.8 1;
> ttable.9.9 1;
> ttable.10.10 1;
> ttable.11.11 1;
> ttable.12.12 1;
> ttable.13.13 1;
> ttable.14.14 1;
> ttable.15.15 1;
> }
>
> ctl.ttable {
> type hw;
> card 1;
> }
>
> #Combine some channels from both cards
> pcm.some {
> type multi;
> slaves.a.pcm analog8_1;
> slaves.a.channels 1;
> slaves.b.pcm analog8_2;
> slaves.b.channels 1;
> bindings.0.slave a;
> bindings.0.channel 0;
> bindings.1.slave b;
> bindings.1.channel 0;
> }
>
> ctl.some {
> type hw;
> card 1;
> }
>
> I also tried tacking on the "pcm.ttable" sections,
> but no difference
> using it over "pcm.all16". I'm guessing that this
> is not a hardware
> speed issue, but a configuration problem. Can
> someone help point me in
> the right direction, please?
>
> Thanks,
> -Bery
>
>
>
>
>
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Received on Thu Nov 17 00:15:05 2005
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