[Protux-devel] snd_pcm_hw_params_set_format returns: invalid format

[Remon Sijrier]

hi all,

Nice to see there's active develepment again on protux. I'm very interested in 
this program, and like the idea behind the jog mouse board. I've seen it only 
on a few apps. and it  gives an amazing speedup in processing your work.

I send a few weeks ago a mail to this list about some bugs. After the 
suggestion to wait until Luciano was back online and commited his stuff to 
CVS, I compiled the CVS this week (today actually) but there is some weird 
problem besided the problems I had already.

The new MustuxAudioDeviceMapper (couldn't that be a longer name? :) ) isn't 
working as expected. I get the following error:


** Error in int MustuxAudioDeviceMapper::Bus::open(int, int, int, bool)
Invalid sample format to bus ICE1712 - 1st OUT (hw:0,0) : Invalid argument

And this is the corresponding code:

        r = snd_pcm_hw_params_set_format (pcmHandle, hwparams, 
SND_PCM_FORMAT_S16_LE);
        if (r < 0)
                {
                PERROR("Invalid sample format to bus %s : 
%s",cBusFullReference,snd_strerror(r));
                goto ALSA_ERROR_AFTER_OPEN_AND_HWPARAMS_ALLOCATION;
                }

(I got this error also when the "supports" metod was called, so I returned 1 
to get rid of it, and see if the rest of the programm was working fine)

If I set the format to SND_PCM_FORMAT_S32_LE it works, but them I'm playing 16 
bits audio in a 32 bit way? Really ugly sound.

Also the setting of the channels isn't working:

        // set the count of channels
        r = snd_pcm_hw_params_set_channels(pcmHandle, hwparams, 10);
        if (r < 0)

10 = channels should be 2.

But if I change 10 into channels (back to the original variable) I get a 
segfault.


This are the actual settings after I get the "invalid format" error:

ACCESS:  RW_INTERLEAVED
FORMAT:  S32_LE
SUBFORMAT:  STD
SAMPLE_BITS: 32
FRAME_BITS: 320
CHANNELS: 10
RATE: [8000 96000]
PERIOD_TIME: (20 409500]
PERIOD_SIZE: [2 3276]
PERIOD_BYTES: [80 131040]
PERIODS: [1 1024]
BUFFER_TIME: (20 819125]
BUFFER_SIZE: [2 6553]
BUFFER_BYTES: [80 262120]
TICK_TIME: 10000

As you see, its works only if I set format and channels to the values listed 
above, but it must be possible to set it to 16 bits and 2 channels?
I looked into some other code, for example alsaplayer, and it uses exactly the 
same statements as MADM. With this difference, alsaplayer plays sound, and 
protux: segfaults (set_channel); invalid format (set_format)

I looked at it several hours but I don't see anything what could be wrong. 
I tried also to add:

#include <alsa/asoundlib.h>

Got some errors, fixed it (actually I disabled some  snd_pcm_hw_params_get 
which produced the errors.) but problem remains.

I really dont' know what to do about it. Hopefully you can help me out. I'll 
wait sending the other problems after this one is fixed :) 
(just joking)

Greetings,

Remon