[ALSA - liboss 0001228]: Skype Does not work with aoss

[bugtrack@alsa-project.org]

A NOTE has been added to this issue.
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<https://bugtrack.alsa-project.org/alsa-bug/view.php?id=1228> 
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Reported By:                hil
Assigned To:                
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Project:                    ALSA - liboss
Issue ID:                   1228
Category:                   
Reproducibility:            always
Severity:                   minor
Priority:                   normal
Status:                     new
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Date Submitted:             07-03-2005 09:09 CEST
Last Modified:              06-09-2006 03:28 CEST
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Summary:                    Skype Does not work with aoss
Description: 
I downloaded alsa-oss-1.0.9rc2 and install by
# ./configure --with-aoss=yes && make && make install
as root. Virtually every program works except skype
(http://www.skype.com/) version 1.1.0.13_API. I downloaded the Fedora
version of skype from the skype official website. Skype only uses
/dev/dsp. I guess skype uses /dev/dsp as microphone input as well. I could
not hear anything and the microphone did not work as well if I run  skype
like aoss /usr/bin/skype. If I run skype without aoss, then skype works
just fine.
======================================================================
Relationships       ID      Summary
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related to          0001224 artsd-like style
======================================================================

----------------------------------------------------------------------
 pzad - 06-08-06 17:30 
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Look at SNDCTL_DSP_CHANNELS in OSS API reference.

There is:
The returned value may be different than the one requested. The
application must check the returned value and re-adjust it's operation
based on that information.

Skype wants mono, but from ALSA gets stereo. If I look at OSS API
reference, it is skype fault (it doesn't check return value).

----------------------------------------------------------------------
 Raymond - 06-09-06 03:28 
----------------------------------------------------------------------
It depend on aoss open which pcm device and the sound card 

1) hw
2) plughw
3) default
4) ALSA_OSS_PCM_DEVICE

The "type plug" allow mono/stereo conversion, but it also changed the
values return by snd_pcm_hw_params_get_xxx_min() and
snd_pcm_hw_params_get_xxx_max()



#include <alsa/asoundlib.h>
#include <stdio.h>

char *device_name[3]={"hw:0","plughw:0","default"};

int main(int argc, char **argv)
{
    snd_pcm_t *pcm;
    snd_pcm_info_t *pcm_info;
    snd_pcm_hw_params_t *hw_params;
    snd_pcm_format_t format;
    char device[16];
    int err,i;
    int dir,sub;
    int channels,chn_min,chn_max;
	
    printf("ALSA %s\n",snd_asoundlib_version());
    for (i=0; i<3; i++) {
	strcpy(device,device_name[i]);
        for (dir=SND_PCM_STREAM_PLAYBACK; dir<= SND_PCM_STREAM_CAPTURE;
dir++) {
            err = snd_pcm_open(&pcm, device, dir,SND_PCM_NONBLOCK);
            if ( err < 0 ) {
   	        printf(" open %s fail : %s\n",device,snd_strerror(err));
            }
            else {
                snd_pcm_info_alloca(&pcm_info);
 	        err = snd_pcm_info(pcm, pcm_info);
	        if ( err < 0 ) {
 	      	    printf(" pcm_info : %s\n",snd_strerror(err));
	        };
		printf("%s %s %s\n",device,snd_pcm_info_get_name(pcm_info),dir ==
SND_PCM_STREAM_PLAYBACK ? "Playback" : "Capture");
                snd_pcm_hw_params_malloc(&hw_params);
		err = snd_pcm_hw_params_any(pcm, hw_params);
		if ( err < 0 ) {
		    printf("hw_params_any error %s\n",snd_strerror(err));
		} else {
	            err = snd_pcm_hw_params_get_channels_min(hw_params,
&chn_min);
		    printf("%s channel min=%d\n",device,chn_min);
		    err = snd_pcm_hw_params_get_channels_max(hw_params, &chn_max);
		    printf("%s channel max=%d\n",device,chn_max);

		    for (channels=chn_min; channels<=chn_max; channels++) {
			if ( snd_pcm_hw_params_test_channels(pcm,hw_params,channels) == 0 ) 
			    printf(" channel : %d\n",channels);
		    };
                };
	        snd_pcm_close(pcm);
   	    };
        };
    };
}

Issue History
Date Modified  Username       Field                    Change              
======================================================================
07-03-05 09:09 hil            New Issue                                    
08-09-05 15:33 rapand         Note Added: 0005732                          
08-10-05 00:49 rlrevell       Relationship added       duplicate of 0001224
08-10-05 00:50 rlrevell       Note Added: 0005740                          
12-31-05 00:19 rlrevell       Note Added: 0007315                          
01-02-06 18:54 rlrevell       Relationship deleted     duplicate of 0001224
01-02-06 18:55 rlrevell       Relationship added       related to 0001224  
01-02-06 18:56 rlrevell       Note Added: 0007375                          
01-05-06 21:36 Hetfield       Note Added: 0007479                          
01-05-06 21:40 rlrevell       Note Added: 0007480                          
01-05-06 21:42 rlrevell       Note Added: 0007481                          
01-05-06 22:01 Hetfield       Note Added: 0007482                          
01-28-06 05:34 nono31         Note Added: 0007824                          
01-28-06 05:35 nono31         Issue Monitored: nono31                      
01-28-06 05:38 rlrevell       Note Added: 0007825                          
01-28-06 06:11 nono31         Note Added: 0007826                          
01-28-06 06:12 nono31         File Added: strace_aoss_kiax.bz2                  
 
01-28-06 06:13 nono31         Note Added: 0007827                          
03-22-06 00:28 rlrevell       Note Added: 0008761                          
03-22-06 10:02 Hetfield       Note Added: 0008849                          
04-01-06 10:55 Hetfield       Note Added: 0009054                          
06-08-06 04:01 Raymond        Note Added: 0010107                          
06-08-06 17:30 pzad           Note Added: 0010114                          
06-09-06 03:28 Raymond        Note Added: 0010125                          
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