[ALSA - driver 0000572]: spdif hw entry fails to work in multi

[bugtrack@alsa-project.org]

The following bug has been REOPENED.
======================================================================
https://bugtrack.alsa-project.org/alsa-bug/bug_view_page.php?bug_id=0000572
======================================================================
Reported By:                ramendik
Assigned To:                tiwai
======================================================================
Project:                    ALSA - driver
Bug ID:                     572
Category:                   PCI - intel8x0
Reproducibility:            always
Severity:                   major
Priority:                   normal
Status:                     feedback
Distribution:               RH-based
Kernel Version:             2.6.8.1, with alsa 1.0.7rc1 plus patches from bug 0000505
======================================================================
Date Submitted:             10-08-2004 02:27 CEST
Last Modified:              10-11-2004 15:39 CEST
======================================================================
Summary:                    spdif hw entry fails to work in multi
Description: 
After bug 0000505 was fixed, hw:0,0 only plays to analog devices, and
hw:0,4 to spdif. As one needs output in both, I tried to use .asoundrc ,
and therefore needed to use the "multi" pcm type in order to unite these
two (and then route). This is what I put in .asoundrc

pcm.whole {
    type multi
    slaves.a.pcm "hw:0,0"
    slaves.a.channels 2
    slaves.b.pcm "hw:0,4"
    slaves.b.channels 2
    bindings.0.slave a
    bindings.0.channel 0
    bindings.1.slave a
    bindings.1.channel 1
    bindings.2.slave b
    bindings.2.channel 0
    bindings.3.slave b
    bindings.3.channel 1
}

pcm.rt {
    type route
    slave.pcm "whole"
    ttable.0.0 1
    ttable.1.1 1
    ttable.0.2 1
    ttable.1.3 1
}

The ttable may be wrong - I could not find a sane description anywhere -
but I tried many variants, and besides, playing to "whole" bypasses this.

So here's what I get when playing to "rt" OR to "whole" via alsaplayer :

$ alsaplayer -d whole test.wav 
error on set_channels (2)
Unavailable hw params:
ACCESS:  RW_INTERLEAVED
FORMAT:  S16_LE
SUBFORMAT:  STD
SAMPLE_BITS: 16
FRAME_BITS: 64
CHANNELS: 4
RATE: 44100
PERIOD_TIME: (181 371520)
PERIOD_SIZE: [8 16384]
PERIOD_BYTES: [64 131072]
PERIODS: [1 1024]
BUFFER_TIME: (181 371520)
BUFFER_SIZE: [8 16384]
BUFFER_BYTES: [64 131072]
TICK_TIME: 1000
error on set_channels (2)
Unavailable hw params:
ACCESS:  RW_INTERLEAVED
FORMAT:  S16_LE
SUBFORMAT:  STD
SAMPLE_BITS: 16
FRAME_BITS: 64
CHANNELS: 4
RATE: 44100
PERIOD_TIME: (181 371520)
PERIOD_SIZE: [8 16384]
PERIOD_BYTES: [64 131072]
PERIODS: [1 1024]
BUFFER_TIME: (181 371520)
BUFFER_SIZE: [8 16384]
BUFFER_BYTES: [64 131072]
TICK_TIME: 1000
failed to configure output device...trying OSS

then alsaplayer hangs until interrupted.

When I comment out everything related to slave b, "whole" seems to work
(without spdif output, of course). So this seems like a bug in the spdif
device.
======================================================================

----------------------------------------------------------------------
 tiwai - 10-08-2004 12:13 CEST 
----------------------------------------------------------------------
Use this:

pcm.rt {
    type route
    slave.pcm whole
    slave.channels 4
    ttable.0.0 1
    ttable.1.1 1
    ttable.0.2 1
    ttable.1.3 1
}

and run with -d rt .

----------------------------------------------------------------------
 ramendik - 10-08-2004 12:29 CEST 
----------------------------------------------------------------------
Thanks. This has worked.

A definite must for the FAQ, and a link to this should be present in the
soundcard matrix for i865 - which at this point is not even available. 
But I'll refile this as a documentation bug. Please close this one.

Actually, the absence of a *decent* documentation of the route type is
another documentation bug. And, as a professional tech writer I'm
qualified to fix this. I'll write to alsa-devel to offer my services.

----------------------------------------------------------------------
 tiwai - 10-08-2004 12:42 CEST 
----------------------------------------------------------------------
Yes, we know the documentation problems :-<
Any help would be appreciated.

BTW, it's possible to implement the analog and spdif simultaneous
output on ICH4 without data duplication.  I'll try a hack later.

Anyway, I close this bug now.

----------------------------------------------------------------------
 tiwai - 10-11-2004 15:39 CEST 
----------------------------------------------------------------------
Could you try the attached patch?  With this patch, the signal to
hw:0,0 will be routed to the spdif, too.

This behavior should be switched by either a module parameter or a
mixer control because someone may want to use analog and SPDIF
separately to play different streams.

Bug History
Date Modified  Username       Field                    Change              
======================================================================
10-08-04 02:27 ramendik       New Bug                                      
10-08-04 02:27 ramendik       Distribution              => RH-based        
10-08-04 02:27 ramendik       Kernel Version            => 2.6.8.1, with alsa 1.0.7rc1 plus patches from bug 0000505
10-08-04 02:31 ramendik       Bug Monitored: ramendik                      
10-08-04 12:13 tiwai          Bugnote Added: 0002045                       
10-08-04 12:29 ramendik       Bugnote Added: 0002048                       
10-08-04 12:42 tiwai          Bugnote Added: 0002049                       
10-08-04 12:42 tiwai          Assigned To               => tiwai           
10-08-04 12:42 tiwai          Resolution               open => not a bug   
10-08-04 12:42 tiwai          Status                   new => resolved     
10-11-04 15:39 tiwai          Bugnote Added: 0002079                       
10-11-04 15:39 tiwai          Resolution               not a bug => reopened
10-11-04 15:39 tiwai          Status                   resolved => feedback
======================================================================


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