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freebsd-dev/sys/dev/sound/pcm/feeder.c
Cameron Grant 0e25481f93 fix dma underrun issues 
mutate some panics to kasserts
add more spl protection

PR:		kern/14990
Partially Submitted by:	Vladimir N.Silyaev <vns@delta.odessa.ua>
Reviewed by:	dfr
1999-12-05 19:09:13 +00:00

416 lines
13 KiB
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/*
* Copyright (c) 1999 Cameron Grant <gandalf@vilnya.demon.co.uk>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <dev/sound/pcm/sound.h>
static int chn_addfeeder(pcm_channel *c, pcm_feeder *f);
static int chn_removefeeder(pcm_channel *c);
#define FEEDBUFSZ 8192
static unsigned char ulaw_to_u8[] = {
3, 7, 11, 15, 19, 23, 27, 31,
35, 39, 43, 47, 51, 55, 59, 63,
66, 68, 70, 72, 74, 76, 78, 80,
82, 84, 86, 88, 90, 92, 94, 96,
98, 99, 100, 101, 102, 103, 104, 105,
106, 107, 108, 109, 110, 111, 112, 113,
113, 114, 114, 115, 115, 116, 116, 117,
117, 118, 118, 119, 119, 120, 120, 121,
121, 121, 122, 122, 122, 122, 123, 123,
123, 123, 124, 124, 124, 124, 125, 125,
125, 125, 125, 125, 126, 126, 126, 126,
126, 126, 126, 126, 127, 127, 127, 127,
127, 127, 127, 127, 127, 127, 127, 127,
128, 128, 128, 128, 128, 128, 128, 128,
128, 128, 128, 128, 128, 128, 128, 128,
128, 128, 128, 128, 128, 128, 128, 128,
253, 249, 245, 241, 237, 233, 229, 225,
221, 217, 213, 209, 205, 201, 197, 193,
190, 188, 186, 184, 182, 180, 178, 176,
174, 172, 170, 168, 166, 164, 162, 160,
158, 157, 156, 155, 154, 153, 152, 151,
150, 149, 148, 147, 146, 145, 144, 143,
143, 142, 142, 141, 141, 140, 140, 139,
139, 138, 138, 137, 137, 136, 136, 135,
135, 135, 134, 134, 134, 134, 133, 133,
133, 133, 132, 132, 132, 132, 131, 131,
131, 131, 131, 131, 130, 130, 130, 130,
130, 130, 130, 130, 129, 129, 129, 129,
129, 129, 129, 129, 129, 129, 129, 129,
128, 128, 128, 128, 128, 128, 128, 128,
128, 128, 128, 128, 128, 128, 128, 128,
128, 128, 128, 128, 128, 128, 128, 128,
};
static unsigned char u8_to_ulaw[] = {
0, 0, 0, 0, 0, 1, 1, 1,
1, 2, 2, 2, 2, 3, 3, 3,
3, 4, 4, 4, 4, 5, 5, 5,
5, 6, 6, 6, 6, 7, 7, 7,
7, 8, 8, 8, 8, 9, 9, 9,
9, 10, 10, 10, 10, 11, 11, 11,
11, 12, 12, 12, 12, 13, 13, 13,
13, 14, 14, 14, 14, 15, 15, 15,
15, 16, 16, 17, 17, 18, 18, 19,
19, 20, 20, 21, 21, 22, 22, 23,
23, 24, 24, 25, 25, 26, 26, 27,
27, 28, 28, 29, 29, 30, 30, 31,
31, 32, 33, 34, 35, 36, 37, 38,
39, 40, 41, 42, 43, 44, 45, 46,
47, 49, 51, 53, 55, 57, 59, 61,
63, 66, 70, 74, 78, 84, 92, 104,
254, 231, 219, 211, 205, 201, 197, 193,
190, 188, 186, 184, 182, 180, 178, 176,
175, 174, 173, 172, 171, 170, 169, 168,
167, 166, 165, 164, 163, 162, 161, 160,
159, 159, 158, 158, 157, 157, 156, 156,
155, 155, 154, 154, 153, 153, 152, 152,
151, 151, 150, 150, 149, 149, 148, 148,
147, 147, 146, 146, 145, 145, 144, 144,
143, 143, 143, 143, 142, 142, 142, 142,
141, 141, 141, 141, 140, 140, 140, 140,
139, 139, 139, 139, 138, 138, 138, 138,
137, 137, 137, 137, 136, 136, 136, 136,
135, 135, 135, 135, 134, 134, 134, 134,
133, 133, 133, 133, 132, 132, 132, 132,
131, 131, 131, 131, 130, 130, 130, 130,
129, 129, 129, 129, 128, 128, 128, 128,
};
/*****************************************************************************/
static int
feed_root(pcm_feeder *feeder, pcm_channel *ch, u_int8_t *buffer, u_int32_t count, struct uio *stream)
{
int ret, c = 0, s;
KASSERT(count, ("feed_root: count == 0"));
count &= ~((1 << ch->align) - 1);
KASSERT(count, ("feed_root: aligned count == 0"));
s = spltty();
if (ch->smegcnt > 0) {
c = min(ch->smegcnt, count);
bcopy(ch->smegbuf, buffer, c);
ch->smegcnt -= c;
}
count = min(count, stream->uio_resid);
if (count) {
ret = uiomove(buffer, count, stream);
KASSERT(ret == 0, ("feed_root: uiomove failed"));
}
splx(s);
return c + count;
}
pcm_feeder feeder_root = { "root", 0, NULL, NULL, feed_root };
/*****************************************************************************/
static int
feed_8to16(pcm_feeder *f, pcm_channel *c, u_int8_t *b, u_int32_t count, struct uio *stream)
{
int i, j, k;
k = f->source->feed(f->source, c, b, count / 2, stream);
j = k - 1;
i = j * 2 + 1;
while (i > 0 && j >= 0) {
b[i--] = b[j--];
b[i--] = 0;
}
return k * 2;
}
static pcm_feeder feeder_8to16 = { "8to16", 0, NULL, NULL, feed_8to16 };
/*****************************************************************************/
static int
feed_16to8_init(pcm_feeder *f)
{
f->data = malloc(FEEDBUFSZ, M_DEVBUF, M_NOWAIT);
return (f->data == NULL);
}
static int
feed_16to8_free(pcm_feeder *f)
{
if (f->data) free(f->data, M_DEVBUF);
f->data = NULL;
return 0;
}
static int
feed_16to8le(pcm_feeder *f, pcm_channel *c, u_int8_t *b, u_int32_t count, struct uio *stream)
{
u_int32_t i = 0, toget = count * 2;
int j = 1, k;
k = f->source->feed(f->source, c, f->data, min(toget, FEEDBUFSZ), stream);
while (j < k) {
b[i++] = ((u_int8_t *)f->data)[j];
j += 2;
}
return i;
}
static pcm_feeder feeder_16to8le =
{ "16to8le", 1, feed_16to8_init, feed_16to8_free, feed_16to8le };
/*****************************************************************************/
static int
feed_monotostereo8(pcm_feeder *f, pcm_channel *c, u_int8_t *b, u_int32_t count, struct uio *stream)
{
int i, j, k = f->source->feed(f->source, c, b, count / 2, stream);
j = k - 1;
i = j * 2 + 1;
while (i > 0 && j >= 0) {
b[i--] = b[j];
b[i--] = b[j];
j--;
}
return k * 2;
}
static pcm_feeder feeder_monotostereo8 =
{ "monotostereo8", 0, NULL, NULL, feed_monotostereo8 };
/*****************************************************************************/
static int
feed_stereotomono8_init(pcm_feeder *f)
{
f->data = malloc(FEEDBUFSZ, M_DEVBUF, M_NOWAIT);
return (f->data == NULL);
}
static int
feed_stereotomono8_free(pcm_feeder *f)
{
if (f->data) free(f->data, M_DEVBUF);
f->data = NULL;
return 0;
}
static int
feed_stereotomono8(pcm_feeder *f, pcm_channel *c, u_int8_t *b, u_int32_t count, struct uio *stream)
{
u_int32_t i = 0, toget = count * 2;
int j = 0, k;
k = f->source->feed(f->source, c, f->data, min(toget, FEEDBUFSZ), stream);
while (j < k) {
b[i++] = ((u_int8_t *)f->data)[j];
j += 2;
}
return i;
}
static pcm_feeder feeder_stereotomono8 =
{ "stereotomono8", 1, feed_stereotomono8_init, feed_stereotomono8_free,
feed_stereotomono8 };
/*****************************************************************************/
static int
feed_endian(pcm_feeder *f, pcm_channel *c, u_int8_t *b, u_int32_t count, struct uio *stream)
{
u_int8_t t;
int i = 0, j = f->source->feed(f->source, c, b, count, stream);
while (i < j) {
t = b[i];
b[i] = b[i + 1];
b[i + 1] = t;
i += 2;
}
return i;
}
static pcm_feeder feeder_endian = { "endian", -1, NULL, NULL, feed_endian };
/*****************************************************************************/
static int
feed_sign(pcm_feeder *f, pcm_channel *c, u_int8_t *b, u_int32_t count, struct uio *stream)
{
int i = 0, j = f->source->feed(f->source, c, b, count, stream);
int ssz = (int)f->data, ofs = ssz - 1;
while (i < j) {
b[i + ofs] ^= 0x80;
i += ssz;
}
return i;
}
static pcm_feeder feeder_sign8 =
{ "sign8", 0, NULL, NULL, feed_sign, (void *)1 };
static pcm_feeder feeder_sign16 =
{ "sign16", -1, NULL, NULL, feed_sign, (void *)2 };
/*****************************************************************************/
static int
feed_table(pcm_feeder *f, pcm_channel *c, u_int8_t *b, u_int32_t count, struct uio *stream)
{
int i = 0, j = f->source->feed(f->source, c, b, count, stream);
while (i < j) {
b[i] = ((u_int8_t *)f->data)[b[i]];
i++;
}
return i;
}
static pcm_feeder feeder_ulawtou8 =
{ "ulawtou8", 0, NULL, NULL, feed_table, ulaw_to_u8 };
static pcm_feeder feeder_u8toulaw =
{ "u8toulaw", 0, NULL, NULL, feed_table, u8_to_ulaw };
/*****************************************************************************/
struct fmtspec {
int stereo;
int sign;
int bit16;
int bigendian;
int ulaw;
int bad;
};
struct fmtcvt {
pcm_feeder *f;
struct fmtspec ispec, ospec;
};
struct fmtcvt cvttab[] = {
{&feeder_ulawtou8, {-1, 0, 0, 0, 1}, {-1, 0, 0, 0, 0}},
{&feeder_u8toulaw, {-1, 0, 0, 0, 0}, {-1, 0, 0, 0, 1}},
{&feeder_sign8, {-1, 0, 0, 0, 0}, {-1, 1, 0, 0, 0}},
{&feeder_sign8, {-1, 1, 0, 0, 0}, {-1, 0, 0, 0, 0}},
{&feeder_monotostereo8, { 0, -1, 0, 0, -1}, { 1, -1, 0, 0, -1}},
{&feeder_stereotomono8, { 1, -1, 0, 0, -1}, { 0, -1, 0, 0, -1}},
{&feeder_sign16, {-1, 0, 1, 0, 0}, {-1, 1, 1, 0, 0}},
{&feeder_sign16, {-1, 1, 1, 0, 0}, {-1, 0, 1, 0, 0}},
{&feeder_8to16, {-1, -1, 0, 0, 0}, {-1, -1, 1, 0, 0}},
{&feeder_16to8le, {-1, -1, 1, 0, 0}, {-1, -1, 0, 0, 0}},
{&feeder_endian, {-1, -1, 1, 0, 0}, {-1, -1, 1, 1, 0}},
{&feeder_endian, {-1, -1, 1, 1, 0}, {-1, -1, 1, 0, 0}},
};
#define FEEDERTABSZ (sizeof(cvttab) / sizeof(struct fmtcvt))
static int
getspec(u_int32_t fmt, struct fmtspec *spec)
{
spec->stereo = (fmt & AFMT_STEREO)? 1 : 0;
spec->sign = (fmt & AFMT_SIGNED)? 1 : 0;
spec->bit16 = (fmt & AFMT_16BIT)? 1 : 0;
spec->bigendian = (fmt & AFMT_BIGENDIAN)? 1 : 0;
spec->ulaw = (fmt & AFMT_MU_LAW)? 1 : 0;
spec->bad = (fmt & (AFMT_A_LAW | AFMT_MPEG))? 1 : 0;
return 0;
}
static int
cmp(int x, int y)
{
return (x == -1 || x == y || y == -1)? 1 : 0;
}
static int
cmpspec(struct fmtspec *x, struct fmtspec *y)
{
int i = 0;
if (cmp(x->stereo, y->stereo)) i |= 0x01;
if (cmp(x->sign, y->sign)) i |= 0x02;
if (cmp(x->bit16, y->bit16)) i |= 0x04;
if (cmp(x->bigendian, y->bigendian)) i |= 0x08;
if (cmp(x->ulaw, y->ulaw)) i |= 0x10;
return i;
}
static int
cvtapply(pcm_channel *c, struct fmtcvt *cvt, struct fmtspec *s)
{
int i = cmpspec(s, &cvt->ospec);
chn_addfeeder(c, cvt->f);
if (cvt->ospec.stereo != -1) s->stereo = cvt->ospec.stereo;
if (cvt->ospec.sign != -1) s->sign = cvt->ospec.sign;
if (cvt->ospec.bit16 != -1) s->bit16 = cvt->ospec.bit16;
if (cvt->ospec.bigendian != -1) s->bigendian = cvt->ospec.bigendian;
if (cvt->ospec.ulaw != -1) s->ulaw = cvt->ospec.ulaw;
return i;
}
int
chn_feedchain(pcm_channel *c)
{
int i, chosen, iter;
u_int32_t mask;
struct fmtspec s, t;
struct fmtcvt *e;
while (chn_removefeeder(c) != -1);
c->align = 0;
if ((c->format & chn_getcaps(c)->formats) == c->format)
return c->format;
getspec(c->format, &s);
if (s.bad) return -1;
getspec(chn_getcaps(c)->bestfmt, &t);
mask = (~cmpspec(&s, &t)) & 0x1f;
iter = 0;
do {
if (mask == 0 || iter >= 8) break;
chosen = -1;
for (i = 0; i < FEEDERTABSZ && chosen == -1; i++) {
e = &cvttab[i];
if ((cmpspec(&s, &e->ispec) == 0x1f) &&
((~cmpspec(&e->ispec, &e->ospec)) & mask))
chosen = i;
}
if (chosen != -1) mask &= cvtapply(c, &cvttab[chosen], &s);
iter++;
} while (chosen != -1);
return (iter < 8)? chn_getcaps(c)->bestfmt : -1;
}
static int
chn_addfeeder(pcm_channel *c, pcm_feeder *f)
{
pcm_feeder *n;
n = malloc(sizeof(pcm_feeder), M_DEVBUF, M_NOWAIT);
*n = *f;
n->source = c->feeder;
c->feeder = n;
if (n->init) n->init(n);
if (n->align > 0) c->align += n->align;
else if (n->align < 0 && c->align < -n->align) c->align -= n->align;
return 0;
}
static int
chn_removefeeder(pcm_channel *c)
{
pcm_feeder *f;
if (c->feeder == &feeder_root) return -1;
f = c->feeder->source;
if (c->feeder->free) c->feeder->free(c->feeder);
free(c->feeder, M_DEVBUF);
c->feeder = f;
return 0;
}
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