[mythtv] [PATCH] ALSA threaded/buffered rewrite

[Kevin Kuphal]

David George wrote:

> Kevin Kuphal wrote:
>
>> At the suggestion on the list here a little while back, I took the 
>> time to basically duplicate the OSS audio code (threading, buffers, 
>> etc) into the ALSA functions.  I've tested this on my system and I 
>> can playback with my audio device as ALSA:spdif with no studdering or 
>> jumping but the audio is not in sync with the video and I was hoping 
>> someone here that understands such things more than I could take a 
>> look at it.  I'm no ALSA expert nor am I an audio expert.
>
>
> I should have asked before.  What sound card are you using?  Maybe it 
> is something incompatible with mine.
>
> Also, when you enable audio logging and uncomment the line from 
> getSpaceOnSoundCard what do you get?  I have 2004-07-24 14:50:46 
> getSpaceOnSoundcard : 32 0 0 128.  Next I get waiting for space to 
> write 4096 zeros on soundcard which has 128 bytes free.
>
> Here is the output from lspci -v on this machine:
>
> 00:1f.5 Multimedia audio controller: Intel Corp. 82801DB (ICH4) AC'97 
> Audio Controller (rev 02)
>        Subsystem: Asustek Computer, Inc.: Unknown device 8095
>        Flags: bus master, medium devsel, latency 0, IRQ 11
>        I/O ports at 7800
>        I/O ports at 7400 [size=64]
>        Memory at ca800000 (32-bit, non-prefetchable) [size=512]
>        Memory at ca000000 (32-bit, non-prefetchable) [size=256]
>        Capabilities: [50] Power Management version 2
>
> mplayer and aplay work fine, it is just Myth that has no audio.
>
> I also have an Abit motherboard with the same issue
>
> 00:1f.5 Multimedia audio controller: Intel Corp. 82801DB (ICH4) AC'97 
> Audio Controller (rev 02)
>        Subsystem: ABIT Computer Corp.: Unknown device 1006
>        Flags: bus master, medium devsel, latency 0, IRQ 5
>        I/O ports at e000
>        I/O ports at e400 [size=64]
>        Memory at e0001000 (32-bit, non-prefetchable) [size=512]
>        Memory at e0002000 (32-bit, non-prefetchable) [size=256]
>        Capabilities: [50] Power Management version 2
>
> I also tried an SBLive in the Abit computer and have the same problem.
>
> 02:02.0 Multimedia audio controller: Creative Labs SB Live! EMU10k1 
> (rev 08)
>        Subsystem: Creative Labs CT4760 SBLive!
>        Flags: bus master, medium devsel, latency 64, IRQ 5
>        I/O ports at 8400
>        Capabilities: [dc] Power Management version 1
>
> I am still looking into it.  If you could give me the lspci -v output 
> for your audio and your kernel and alsa versions, and the output of 
> getSpaceOnSoundCard it may help me track down what my problem is.

It's a Guillemot Maxi Sound Fortissimo (Yamaha based)

00:0a.0 Multimedia audio controller: Yamaha Corporation YMF-744B [DS-1S 
Audio Controller] (rev 02)
        Subsystem: Yamaha Corporation DS-XG PCI Audio CODEC
        Flags: bus master, medium devsel, latency 32, IRQ 10
        Memory at dfff8000 (32-bit, non-prefetchable) [size=32K]
        I/O ports at ec00 [size=64]
        I/O ports at e800 [size=4]
        Capabilities: [50] Power Management version 1

I can't get the output of the function right now but I'll try to when 
I'm by the machine soon

Kevin