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From: xinhui zhou <zxinhui@ieee.org>
To: alsa-devel@alsa-project.org
Cc: alsa-user@lists.sourceforge.net
Subject: [alsa-devel] Number of PCM instance (pcm device file) for one sound card
Date: Fri, 15 Nov 2019 15:28:05 -0800	[thread overview]
Message-ID: <CABsjGHKpQvojz5UmnKKdkD-8dU9oHtiQ76EEZwWR7D3mYw6OdA@mail.gmail.com> (raw)
In-Reply-To: <CABsjGHJFZD6r7tUKDd17NrAs56O0hypW6MFzJq6m6bWH7ykkPg@mail.gmail.com>

Dear all ,

The tutorial below states that ""Each card device can have up to four pcm
instances"
https://www.kernel.org/doc/html/v4.19/sound/kernel-api/writing-an-alsa-driver.html#pcm-interface
<https://www.google.com/url?q=https://www.kernel.org/doc/html/v4.19/sound/kernel-api/writing-an-alsa-driver.html%23pcm-interface&sa=D&source=hangouts&ust=1573928998988000&usg=AFQjCNGmZgiENmLej2aBTQvp-tspn3u8sg>

I am getting confused with the number '4' .  I thought we can add 8 pcm
device files by default.  By setting  'CONFIG_SND_DYNAMIC_MINORS=y' , we
can have more than 8 pcm device files.
Does that tutorial  mean only 4 pcm devices running at the same time ?

Thanks a lot,

Xinhui,
_______________________________________________
Alsa-devel mailing list
Alsa-devel@alsa-project.org
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      parent reply	other threads:[~2019-11-15 23:29 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-04 16:47 [alsa-devel] parameter for pulse device? frederik
2019-09-09 17:52 ` Takashi Iwai
2019-09-10 17:33   ` frederik
2019-09-17 12:51     ` Tanu Kaskinen
2019-09-17 12:55       ` Takashi Iwai
2019-09-17 13:14         ` Tanu Kaskinen
2019-09-17 13:17           ` Takashi Iwai
2019-09-19 21:12             ` frederik
2019-09-20  7:35               ` Tanu Kaskinen
2019-09-20  7:44                 ` Takashi Iwai
2019-10-15 15:52                   ` frederik
2019-10-18  6:17                     ` Takashi Iwai
2019-10-18  6:41                       ` frederik
2019-09-12 15:42 ` [alsa-devel] How to check ALSA version in Linux kernel xinhui zhou
2019-09-15  9:33   ` Takashi Iwai
2019-11-15 23:28   ` xinhui zhou [this message]

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