[pulseaudio-discuss] Command Line Language

[Max Kempter]

hi,

here is max again.
First of all I have to say that your answers are very helpfully, and week by week I`m nearer by my aim I want to do with PA.

I have some trouble with:
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[/shell]
usr at CST-G2L2:~$  arecord | pacat -p -s 192.56.1.3 -d out -v
Opening a playback stream with sample specification 's16le 2ch 44100Hz'.
Connection established.
Stream successfully created.
Buffer metrics: maxlength=132300, tlength=88200, prebuf=87320, minreq=880
Recording WAVE 'stdin' : Unsigned 8 bit, Rate 8000 Hz, Mono
Time: 0.000 sec; Latency: 1234567890ms (goes up to endless)
[shell/]

The pacat-source is connected with the sink „out“, but there is no level at volume meter at the reciver site.  Each 30 s I see a short amplitude at the level meter, the amplitude goes up to 0dB and after 0.5 s back to circa – 120dB.

I reach the the host I want to reach but the packets are empty (or it send the wrong things).

The second strange thing is that the Latency (I see it through -v option) goes up to endless, or till I push CTRL-C.

If I try 
[/shell]
arecord test.wav  
[shell/]
It works and I record the mic capture.

If I try 
[/shell]
aplay test.wav | pacat -p -s 192.56.1.3 -d out 
[shell/]
Also no problem, I recive the audio at alsa-sink „out“.

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Let`s assume I load a source (eg mic) at Host1 and a load tunnel sink (eg out) from Host2, how can I route the source to the sink?
I want to do this without the modules module-rtp-{send/recv}!

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Next, every time I load a source/sink, with load-module, I have to read this message:

[/shell]
 >>> load-module module-alsa-source device=plughw:0,0 rate=48000 source_name=mic

ALSA lib control.c:910:(snd_ctl_open_noupdate) Invalid CTL plughw:0,0
alsa-util.c: Unable to attach to mixer plughw:0,0: File or Folder not found
[shell/]
Which mixer it means? Alsamixer?

My setup also works with this „error“ message, so it could be the best to ignore it? Or is it a problem with my kernel (2.6.16-2-686 stable)?


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If I send a RTP-Stream via „rtp-send source=mic loop=1“ I don`t get the mic signal to my output sink or to my output.monitor. 
[/shell]
>>>load-module module-rtp-send source=mic loop=1

>>> ls (only importent things)
Default sink name: output
Default source name: mic

7 module(s) loaded.

     index: 4
        name: <module-alsa-source>
        argument: <device=plughw:0,0 fragments=2 fragment_size=128 
        rate=48000 format=alaw channels=1 source_name=mic>
        used: 1
        auto unload: no
    index: 6
        name: <module-alsa-sink>
        argument: <device=plughw:0,0 >
        used: 0
        auto unload: no
    index: 14
        name: <module-rtp-send>
        argument: <source=mic loop=1>
        used: -1
        auto unload: no

1 sink(s) available.
  * index: 0
        name: <output>
        driver: <modules/module-alsa-sink.c>
        volume: <0:  90% 1:  90%>
        latency: <5166 usec>
        monitor_source: <1>
        sample spec: <s16le 2ch 48000Hz>
        channel map: <front-left,front-right>
        owner module: <6>
        description: <ALSA PCM on plughw:0 (NVidia nForce2)>
2 source(s) available.
  * index: 0
        name: <mic>
        driver: <modules/module-alsa-source.c>
        latency: <1500 usec>
        sample spec: <aLaw 1ch 48000Hz>
        channel map: <mono>
        owner module: <4>
        description: <ALSA PCM on plughw:0,0 (NVidia nForce2)>
    index: 3
        name: <output.monitor>
        driver: <modules/module-alsa-sink.c>
        latency: <0 usec>
        sample spec: <aLaw 1ch 48000Hz>
        channel map: <mono>
        monitor_of: <2>
        owner module: <15>
        description: <Monitor Source of ALSA PCM on plughw:0 (NVidia nForce2)>
0 sink input(s) available.   #--> WHY IS HERE NO SINK?????
1 source outputs(s) available.
    index: 12
        name: 'RTP Monitor Stream'
        driver: <modules/rtp/module-rtp-send.c>
        state: RUNNING
        source: <0> 'mic'
        sample spec: <aLaw 1ch 48000Hz>
        channel map: <mono>
        resample method: src-sinc-fastest
        owner module: <14>
0 cache entries available.
0 autoload entries available.

[/shell]

When you look at the loaded modules, you see in each module at the third row after the index the parameter "used". I guess 1 is for used; 0 for not used; -1 for used by a stream ?????

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The next one is about the troughput speed:
If I add the latency of source module and the latency of the rtp-send module together the result is the time from the beginning of signal to the point when my packets send out of my ethernet device !?

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Which is the advantage of the module-null-sink? Is it for people who doesn`t have an audio device? 

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And the last question is about the deamon parameter –high-priority=1 what is the effect about this option? Is it the process priority at machine!?
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thanks in advance

max

























































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