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* uaudio_round_blocksize()

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calculate playing blocksize and recording blocksize independently
This commit is contained in:
kent 2005-01-16 12:46:00 +00:00
parent 55940f7c4e
commit 9dd560ddf7
1 changed files with 27 additions and 18 deletions
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45
sys/dev/usb/uaudio.c
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@ -1,4 +1,4 @@
/* $NetBSD: uaudio.c,v 1.95 2005/01/16 06:02:19 dsainty Exp $ */
/* $NetBSD: uaudio.c,v 1.96 2005/01/16 12:46:00 kent Exp $ */
/*
* Copyright (c) 1999 The NetBSD Foundation, Inc.
@ -44,7 +44,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: uaudio.c,v 1.95 2005/01/16 06:02:19 dsainty Exp $");
__KERNEL_RCSID(0, "$NetBSD: uaudio.c,v 1.96 2005/01/16 12:46:00 kent Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -2220,26 +2220,35 @@ uaudio_round_blocksize(void *addr, int blk,
int mode, const audio_params_t *param)
{
struct uaudio_softc *sc;
int bpf;
int b;
sc = addr;
DPRINTF(("uaudio_round_blocksize: p.bpf=%d r.bpf=%d\n",
sc->sc_playchan.bytes_per_frame,
sc->sc_recchan.bytes_per_frame));
if (sc->sc_playchan.bytes_per_frame > sc->sc_recchan.bytes_per_frame) {
bpf = sc->sc_playchan.bytes_per_frame
+ sc->sc_playchan.sample_size;
DPRINTF(("uaudio_round_blocksize: blk=%d mode=%s\n", blk,
mode == AUMODE_PLAY ? "AUMODE_PLAY" : "AUMODE_RECORD"));
/* chan.bytes_per_frame can be 0. */
if (mode == AUMODE_PLAY || sc->sc_recchan.bytes_per_frame <= 0) {
b = param->sample_rate * UAUDIO_NFRAMES * UAUDIO_NCHANBUFS;
/*
* This does not make accurate value in the case
* of b % USB_FRAMES_PER_SECOND != 0
*/
b /= USB_FRAMES_PER_SECOND;
b *= param->precision / 8 * param->channels;
} else {
bpf = sc->sc_recchan.bytes_per_frame
+ sc->sc_recchan.sample_size;
/*
* use wMaxPacketSize in bytes_per_frame.
* See uaudio_set_params() and uaudio_chan_init()
*/
b = sc->sc_recchan.bytes_per_frame
* UAUDIO_NFRAMES * UAUDIO_NCHANBUFS;
}
/* XXX */
bpf *= UAUDIO_NFRAMES * UAUDIO_NCHANBUFS;
bpf = (bpf + 15) &~ 15;
if (blk < bpf)
blk = bpf;
if (b <= 0)
b = 1;
blk = blk <= b ? b : blk / b * b;
#ifdef DIAGNOSTIC
if (blk <= 0) {
@ -2248,7 +2257,7 @@ uaudio_round_blocksize(void *addr, int blk,
}
#endif
DPRINTFN(1,("uaudio_round_blocksize: blk=%d\n", blk));
DPRINTF(("uaudio_round_blocksize: resultant blk=%d\n", blk));
return blk;
}