I've built Csound and set the options so that it will build with portaudio
and alsa support but when trying to run it with the following options:

-+rtaudio=alsa -odac:hw:0,0

I get an error saying:

 *** Unable to set number of channels on soundcard
Failed to initialise real time audio output

If I try only -odac:hw:0,0 I get the following:

rtaudio: PortAudio module enabled ... using blocking interface
orch compiler:
9 lines read
        instr   1
Elapsed time at end of orchestra compile: real: 0.002s, CPU: 0.000s
sorting score ...
        ... done
Elapsed time at end of score sort: real: 0.002s, CPU: 0.000s
Csound version 5.07 beta (float samples) Dec 16 2007
graphics not supported on this terminal, ascii substituted
0dBFS level = 32768.0
orch now loaded
audio buffered in 256 sample-frame blocks
PortAudio V19-devel
PortAudio: using ALSA device 'hw:0,0'
Expression 'snd_pcm_hw_params_set_channels( pcm, hwParams,
self->numHostChannels )' failed in 'src/hostapi/alsa/pa_linux_alsa.c',
line: 1117
Expression 'PaAlsaStreamComponent_InitialConfigure( &self->playback,
outParams, self->primeBuffers, hwParamsPlayback, &realSr )' failed in
'src/hostapi/alsa/pa_linux_alsa.c', line: 1662
Expression 'PaAlsaStream_Configure( stream, inputParameters,
outputParameters, sampleRate, framesPerBuffer, &inputLatency,
&outputLatency, &hostBufferSizeMode )' failed in
'src/hostapi/alsa/pa_linux_alsa.c', line: 1783
 *** PortAudio: error: -9998: Invalid number of channels
Failed to initialise real time audio output

Sorry about all these questions, I have had to reinstall linux after
windows corrupted my last one so I have to go through all these steps once
more time...


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You could use -odac:plughw:0 and then ALSA will handle all differences
in number of channels and even samplerate.

Steven Yi wrote:
> Hi Rory,
> 
> Were you trying to do a nchnls=1 output on a stereo device?  That
> caused problems for me in the past and I eventually just used nchnls=2
> for everything.  Otherwise, what is the hardware for your 0,0 device?
> And have you tried -odac:default or just -odac ?
> 
> steven
> 
> On Dec 17, 2007 8:59 AM, Rory Walsh  wrote:
>> I've built Csound and set the options so that it will build with portaudio
>> and alsa support but when trying to run it with the following options:
>>
>> -+rtaudio=alsa -odac:hw:0,0
>>
>> I get an error saying:
>>
>>  *** Unable to set number of channels on soundcard
>> Failed to initialise real time audio output
>>
>> If I try only -odac:hw:0,0 I get the following:
>>
>> rtaudio: PortAudio module enabled ... using blocking interface
>> orch compiler:
>> 9 lines read
>>         instr   1
>> Elapsed time at end of orchestra compile: real: 0.002s, CPU: 0.000s
>> sorting score ...
>>         ... done
>> Elapsed time at end of score sort: real: 0.002s, CPU: 0.000s
>> Csound version 5.07 beta (float samples) Dec 16 2007
>> graphics not supported on this terminal, ascii substituted
>> 0dBFS level = 32768.0
>> orch now loaded
>> audio buffered in 256 sample-frame blocks
>> PortAudio V19-devel
>> PortAudio: using ALSA device 'hw:0,0'
>> Expression 'snd_pcm_hw_params_set_channels( pcm, hwParams,
>> self->numHostChannels )' failed in 'src/hostapi/alsa/pa_linux_alsa.c',
>> line: 1117
>> Expression 'PaAlsaStreamComponent_InitialConfigure( &self->playback,
>> outParams, self->primeBuffers, hwParamsPlayback, &realSr )' failed in
>> 'src/hostapi/alsa/pa_linux_alsa.c', line: 1662
>> Expression 'PaAlsaStream_Configure( stream, inputParameters,
>> outputParameters, sampleRate, framesPerBuffer, &inputLatency,
>> &outputLatency, &hostBufferSizeMode )' failed in
>> 'src/hostapi/alsa/pa_linux_alsa.c', line: 1783
>>  *** PortAudio: error: -9998: Invalid number of channels
>> Failed to initialise real time audio output
>>
>> Sorry about all these questions, I have had to reinstall linux after
>> windows corrupted my last one so I have to go through all these steps once
>> more time...
>>
>>
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> 
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-- 
/Jonatan         [ http://kymatica.com ]

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Thanks Steven, that was the problem alright, my card doesn't like nchnls
set to 1. I never would have thought of that. Cheers,

Rory.



> Hi Rory,
>
> Were you trying to do a nchnls=1 output on a stereo device?  That
> caused problems for me in the past and I eventually just used nchnls=2
> for everything.  Otherwise, what is the hardware for your 0,0 device?
> And have you tried -odac:default or just -odac ?
>
> steven
>
> On Dec 17, 2007 8:59 AM, Rory Walsh  wrote:
>> I've built Csound and set the options so that it will build with
>> portaudio
>> and alsa support but when trying to run it with the following options:
>>
>> -+rtaudio=alsa -odac:hw:0,0
>>
>> I get an error saying:
>>
>>  *** Unable to set number of channels on soundcard
>> Failed to initialise real time audio output
>>
>> If I try only -odac:hw:0,0 I get the following:
>>
>> rtaudio: PortAudio module enabled ... using blocking interface
>> orch compiler:
>> 9 lines read
>>         instr   1
>> Elapsed time at end of orchestra compile: real: 0.002s, CPU: 0.000s
>> sorting score ...
>>         ... done
>> Elapsed time at end of score sort: real: 0.002s, CPU: 0.000s
>> Csound version 5.07 beta (float samples) Dec 16 2007
>> graphics not supported on this terminal, ascii substituted
>> 0dBFS level = 32768.0
>> orch now loaded
>> audio buffered in 256 sample-frame blocks
>> PortAudio V19-devel
>> PortAudio: using ALSA device 'hw:0,0'
>> Expression 'snd_pcm_hw_params_set_channels( pcm, hwParams,
>> self->numHostChannels )' failed in 'src/hostapi/alsa/pa_linux_alsa.c',
>> line: 1117
>> Expression 'PaAlsaStreamComponent_InitialConfigure( &self->playback,
>> outParams, self->primeBuffers, hwParamsPlayback, &realSr )' failed in
>> 'src/hostapi/alsa/pa_linux_alsa.c', line: 1662
>> Expression 'PaAlsaStream_Configure( stream, inputParameters,
>> outputParameters, sampleRate, framesPerBuffer, &inputLatency,
>> &outputLatency, &hostBufferSizeMode )' failed in
>> 'src/hostapi/alsa/pa_linux_alsa.c', line: 1783
>>  *** PortAudio: error: -9998: Invalid number of channels
>> Failed to initialise real time audio output
>>
>> Sorry about all these questions, I have had to reinstall linux after
>> windows corrupted my last one so I have to go through all these steps
>> once
>> more time...
>>
>>
>> -------------------------------------------------------------------------
>> SF.Net email is sponsored by:
>> Check out the new SourceForge.net Marketplace.
>> It's the best place to buy or sell services
>> for just about anything Open Source.
>> http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace
>> _______________________________________________
>> Csound-devel mailing list
>> Csound-devel@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/csound-devel
>>
>
> -------------------------------------------------------------------------
> SF.Net email is sponsored by:
> Check out the new SourceForge.net Marketplace.
> It's the best place to buy or sell services
> for just about anything Open Source.
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> _______________________________________________
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> Csound-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/csound-devel
>



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