2 * Copyright (c) 2005 Ariff Abdullah <ariff@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * $FreeBSD: src/sys/dev/sound/pcm/feeder_volume.c,v 1.2.2.1 2005/12/30 19:55:54 netchild Exp $
27 * $DragonFly: src/sys/dev/sound/pcm/feeder_volume.c,v 1.1 2007/01/04 21:47:03 corecode Exp $
30 * feeder_volume, a long 'Lost Technology' rather than a new feature.
33 #include <dev/sound/pcm/sound.h>
34 #include "feeder_if.h"
36 SND_DECLARE_FILE("$DragonFly: src/sys/dev/sound/pcm/feeder_volume.c,v 1.1 2007/01/04 21:47:03 corecode Exp $");
39 feed_volume_s16(struct pcm_feeder *f, struct pcm_channel *c, uint8_t *b,
40 uint32_t count, void *source)
45 k = FEEDER_FEED(f->source, c, b, count & ~1, source);
48 device_printf(c->dev, "%s: Not enough data (Got: %d bytes)\n",
55 device_printf(c->dev, "%s: Bytes not 16bit aligned.\n", __func__);
60 vol[0] = c->volume & 0x7f;
61 vol[1] = (c->volume >> 8) & 0x7f;
64 j = (vol[i & 1] * buf[i]) / 100;
74 static struct pcm_feederdesc feeder_volume_s16_desc[] = {
75 {FEEDER_VOLUME, AFMT_S16_LE|AFMT_STEREO, AFMT_S16_LE|AFMT_STEREO, 0},
78 static kobj_method_t feeder_volume_s16_methods[] = {
79 KOBJMETHOD(feeder_feed, feed_volume_s16),
82 FEEDER_DECLARE(feeder_volume_s16, 2, NULL);