Re: [Alsa-user] Audio hardware with "pause" support

[Florian W. <fw...@mo...>]

Thanks for the hint, Clemens.

If I interpret this information correctly, then it seems that many 
different sound drivers actually support pause, and consequently many 
audio architectures have the functionality as well (or it is emulated by 
the drivers). The real problem is the dmix plugin. In particular, I see 
hda_intel in the list. When I used ALSA with HDA Intel onboard hardware, 
pause was not available, probably due to the dmix plugin being used.

So my next questions are:

 - What is the dmix plugin and what are the benefits of using it?
 - Is it possible to disable the dmix plugin?
 - What consequences does disabling the dmix plugin have? What essential 
features of ALSA will be missing without it?

Best regards,
Florian

Clemens Ladisch wrote:
> Florian Winter wrote:
>   
>> Is there another way to determine whether a certain hardware supports
>> snd_pcm_pause without having to test the hardware?
>>     
>
> $ grep -rl SNDRV_PCM_INFO_PAUSE sound
> sound/arm/pxa2xx-pcm.c
> sound/arm/sa11xx-uda1341.c
> sound/core/pcm_native.c
> sound/drivers/vx/vx_pcm.c
> sound/pci/als300.c
> sound/pci/atiixp.c
> sound/pci/au88x0/au88x0_pcm.c
> sound/pci/cmipci.c
> sound/pci/cs4281.c
> sound/pci/cs5535audio/cs5535audio_pcm.c
> sound/pci/echoaudio/darla20.c
> sound/pci/echoaudio/darla24.c
> sound/pci/echoaudio/echo3g.c
> sound/pci/echoaudio/gina20.c
> sound/pci/echoaudio/gina24.c
> sound/pci/echoaudio/indigo.c
> sound/pci/echoaudio/indigodj.c
> sound/pci/echoaudio/indigoio.c
> sound/pci/echoaudio/layla20.c
> sound/pci/echoaudio/layla24.c
> sound/pci/echoaudio/mia.c
> sound/pci/echoaudio/mona.c
> sound/pci/emu10k1/emupcm.c
> sound/pci/ens1370.c
> sound/pci/es1968.c
> sound/pci/fm801.c
> sound/pci/hda/hda_intel.c
> sound/pci/ice1712/ice1712.c
> sound/pci/ice1712/ice1724.c
> sound/pci/intel8x0.c
> sound/pci/intel8x0m.c
> sound/pci/maestro3.c
> sound/pci/mixart/mixart.c
> sound/pci/nm256/nm256.c
> sound/pci/oxygen/oxygen_pcm.c
> sound/pci/pcxhr/pcxhr.c
> sound/pci/riptide/riptide.c
> sound/pci/rme32.c
> sound/pci/rme96.c
> sound/pci/trident/trident_main.c
> sound/pci/via82xx.c
> sound/pci/via82xx_modem.c
> sound/pci/ymfpci/ymfpci_main.c
> sound/pcmcia/pdaudiocf/pdaudiocf_pcm.c
> sound/soc/at91/at91-pcm.c
> sound/soc/davinci/davinci-pcm.c
> sound/soc/omap/omap-pcm.c
> sound/soc/pxa/pxa2xx-pcm.c
> sound/soc/s3c24xx/s3c24xx-pcm.c
> sound/usb/usbaudio.c
>
>
> Please note that the dmix plugin does not support pausing even if the
> hardware device does.
>
>
> HTH
> Clemens
>   
-- 
Florian Winter
Software-Entwickler