Aren
/
NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Allow for block sizes less than hw block size. This allows for the lowest 

possible latency for all precision, sample rate and frequencies.

This is a rework of rev 1.419.
This commit is contained in:
nat 2017-11-03 05:07:37 +00:00
parent 4a6596f95c
commit bc03d86400
1 changed files with 20 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
sys/dev/audio.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: audio.c,v 1.423 2017/11/03 05:04:17 nat Exp $ */
/* $NetBSD: audio.c,v 1.424 2017/11/03 05:07:37 nat Exp $ */
/*-
* Copyright (c) 2016 Nathanial Sloss <nathanialsloss@yahoo.com.au>
@ -148,7 +148,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: audio.c,v 1.423 2017/11/03 05:04:17 nat Exp $");
__KERNEL_RCSID(0, "$NetBSD: audio.c,v 1.424 2017/11/03 05:07:37 nat Exp $");
#ifdef _KERNEL_OPT
#include "audio.h"
@ -2005,9 +2005,25 @@ audio_init_ringbuffer(struct audio_softc *sc, struct audio_ringbuffer *rp,
blksize = rp->s.bufsize / AUMINNOBLK;
ROUNDSIZE(blksize);
DPRINTF(("audio_init_ringbuffer: MI blksize=%d\n", blksize));
if (sc->hw_if->round_blocksize)
struct virtual_channel *hwvc = sc->sc_hwvc;
if (sc->hw_if->round_blocksize &&
(rp == &hwvc->sc_mpr || rp == &hwvc->sc_mrr)) {
blksize = sc->hw_if->round_blocksize(sc->hw_hdl, blksize,
mode, &rp->s.param);
mode, &rp->s.param);
} else {
int hwblksize = AU_RING_SIZE;
if (sc->hw_if->round_blocksize) {
if (audio_can_capture(sc))
hwblksize = sc->sc_hwvc->sc_mpr.blksize;
else
hwblksize = sc->sc_hwvc->sc_mrr.blksize;
}
if (blksize > hwblksize)
blksize = hwblksize;
}
if (blksize <= 0)
panic("audio_init_ringbuffer: blksize=%d", blksize);
nblks = rp->s.bufsize / blksize;