On Mon, 10 Nov 2003, [ISO-8859-1] Robert Brückmann wrote:
> I have 3 capture and 3 playback devices (all sample-synced via
> wordclock) which I want to sync via snd_pcm_link(). So I do the
> following calls:
>
> snd_pcm_link(playback1,playback2);
> snd_pcm_link(playback2,playback3);
> snd_pcm_link(capture1,capture2);
> snd_pcm_link(capture2,capture3);
> snd_pcm_link(playback1,capture1);
>
> This worked in an older version of ALSA without problems (I used
> 0.9.0beta12), but since I upgraded to 0.9.7a, I can't link, the last
> link operation gives an error:
>
> ALSA lib pcm.c:1148:(snd_pcm_link) SNDRV_PCM_IOCTL_LINK failed:
> Operation already in progress
>
> How can I do the linking in current Alsa versions?
This is wrong sequence. Try:
snd_pcm_link(playback1,playback2);
snd_pcm_link(playback2,playback3);
snd_pcm_link(playback3,capture1);
snd_pcm_link(capture1,capture2);
snd_pcm_link(capture2,capture3);
or:
snd_pcm_link(playback1,playback2);
snd_pcm_link(playback1,playback3);
snd_pcm_link(playback1,capture1);
snd_pcm_link(playback1,capture2);
snd_pcm_link(playback1,capture3);
It's true that semantics changed a bit. The stream being added shouldn't
be linked.
Jaroslav
-----
Jaroslav Kysela <[EMAIL PROTECTED]>
Linux Kernel Sound Maintainer
ALSA Project, SuSE Labs
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