1 /*
2 * Copyright (c) 2001 Cameron Grant <cg@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
13 *
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
24 * SUCH DAMAGE.
25 */
26
27 #include <dev/sound/pcm/sound.h>
28 #include <dev/sound/pcm/vchan.h>
29 #include "feeder_if.h"
30
31 SND_DECLARE_FILE("$FreeBSD: releng/5.2/sys/dev/sound/pcm/vchan.c 125836 2004-02-15 00:16:53Z truckman $");
32
33 struct vchinfo {
34 u_int32_t spd, fmt, blksz, bps, run;
35 struct pcm_channel *channel, *parent;
36 struct pcmchan_caps caps;
37 };
38
39 static u_int32_t vchan_fmt[] = {
40 AFMT_STEREO | AFMT_S16_LE,
41 0
42 };
43
44 static int
45 vchan_mix_s16(int16_t *to, int16_t *tmp, unsigned int count)
46 {
47 /*
48 * to is the output buffer, tmp is the input buffer
49 * count is the number of 16bit samples to mix
50 */
51 int i;
52 int x;
53
54 for(i = 0; i < count; i++) {
55 x = to[i];
56 x += tmp[i];
57 if (x < -32768) {
58 /* printf("%d + %d = %d (u)\n", to[i], tmp[i], x); */
59 x = -32768;
60 }
61 if (x > 32767) {
62 /* printf("%d + %d = %d (o)\n", to[i], tmp[i], x); */
63 x = 32767;
64 }
65 to[i] = x & 0x0000ffff;
66 }
67 return 0;
68 }
69
70 static int
71 feed_vchan_s16(struct pcm_feeder *f, struct pcm_channel *c, u_int8_t *b, u_int32_t count, void *source)
72 {
73 /* we're going to abuse things a bit */
74 struct snd_dbuf *src = source;
75 struct pcmchan_children *cce;
76 struct pcm_channel *ch;
77 int16_t *tmp, *dst;
78 unsigned int cnt;
79
80 if (sndbuf_getsize(src) < count)
81 panic("feed_vchan_s16(%s): tmp buffer size %d < count %d, flags = 0x%x",
82 c->name, sndbuf_getsize(src), count, c->flags);
83 count &= ~1;
84 bzero(b, count);
85
86 /*
87 * we are going to use our source as a temporary buffer since it's
88 * got no other purpose. we obtain our data by traversing the channel
89 * list of children and calling vchan_mix_* to mix count bytes from each
90 * into our destination buffer, b
91 */
92 dst = (int16_t *)b;
93 tmp = (int16_t *)sndbuf_getbuf(src);
94 bzero(tmp, count);
95 SLIST_FOREACH(cce, &c->children, link) {
96 ch = cce->channel;
97 if (ch->flags & CHN_F_TRIGGERED) {
98 if (ch->flags & CHN_F_MAPPED)
99 sndbuf_acquire(ch->bufsoft, NULL, sndbuf_getfree(ch->bufsoft));
100 cnt = FEEDER_FEED(ch->feeder, ch, (u_int8_t *)tmp, count, ch->bufsoft);
101 vchan_mix_s16(dst, tmp, cnt / 2);
102 }
103 }
104
105 return count;
106 }
107
108 static struct pcm_feederdesc feeder_vchan_s16_desc[] = {
109 {FEEDER_MIXER, AFMT_S16_LE | AFMT_STEREO, AFMT_S16_LE | AFMT_STEREO, 0},
110 {0},
111 };
112 static kobj_method_t feeder_vchan_s16_methods[] = {
113 KOBJMETHOD(feeder_feed, feed_vchan_s16),
114 { 0, 0 }
115 };
116 FEEDER_DECLARE(feeder_vchan_s16, 2, NULL);
117
118 /************************************************************/
119
120 static void *
121 vchan_init(kobj_t obj, void *devinfo, struct snd_dbuf *b, struct pcm_channel *c, int dir)
122 {
123 struct vchinfo *ch;
124 struct pcm_channel *parent = devinfo;
125
126 KASSERT(dir == PCMDIR_PLAY, ("vchan_init: bad direction"));
127 ch = malloc(sizeof(*ch), M_DEVBUF, M_WAITOK | M_ZERO);
128 ch->parent = parent;
129 ch->channel = c;
130 ch->fmt = AFMT_U8;
131 ch->spd = DSP_DEFAULT_SPEED;
132 ch->blksz = 2048;
133
134 c->flags |= CHN_F_VIRTUAL;
135
136 return ch;
137 }
138
139 static int
140 vchan_free(kobj_t obj, void *data)
141 {
142 return 0;
143 }
144
145 static int
146 vchan_setformat(kobj_t obj, void *data, u_int32_t format)
147 {
148 struct vchinfo *ch = data;
149 struct pcm_channel *parent = ch->parent;
150
151 ch->fmt = format;
152 ch->bps = 1;
153 ch->bps <<= (ch->fmt & AFMT_STEREO)? 1 : 0;
154 ch->bps <<= (ch->fmt & AFMT_16BIT)? 1 : 0;
155 ch->bps <<= (ch->fmt & AFMT_32BIT)? 2 : 0;
156 chn_notify(parent, CHN_N_FORMAT);
157 return 0;
158 }
159
160 static int
161 vchan_setspeed(kobj_t obj, void *data, u_int32_t speed)
162 {
163 struct vchinfo *ch = data;
164 struct pcm_channel *parent = ch->parent;
165
166 ch->spd = speed;
167 chn_notify(parent, CHN_N_RATE);
168 return speed;
169 }
170
171 static int
172 vchan_setblocksize(kobj_t obj, void *data, u_int32_t blocksize)
173 {
174 struct vchinfo *ch = data;
175 struct pcm_channel *parent = ch->parent;
176 int prate, crate;
177
178 ch->blksz = blocksize;
179 chn_notify(parent, CHN_N_BLOCKSIZE);
180
181 crate = ch->spd * ch->bps;
182 prate = sndbuf_getspd(parent->bufhard) * sndbuf_getbps(parent->bufhard);
183 blocksize = sndbuf_getblksz(parent->bufhard);
184 blocksize *= prate;
185 blocksize /= crate;
186
187 return blocksize;
188 }
189
190 static int
191 vchan_trigger(kobj_t obj, void *data, int go)
192 {
193 struct vchinfo *ch = data;
194 struct pcm_channel *parent = ch->parent;
195
196 if (go == PCMTRIG_EMLDMAWR || go == PCMTRIG_EMLDMARD)
197 return 0;
198
199 ch->run = (go == PCMTRIG_START)? 1 : 0;
200 chn_notify(parent, CHN_N_TRIGGER);
201
202 return 0;
203 }
204
205 static struct pcmchan_caps *
206 vchan_getcaps(kobj_t obj, void *data)
207 {
208 struct vchinfo *ch = data;
209
210 ch->caps.minspeed = sndbuf_getspd(ch->parent->bufhard);
211 ch->caps.maxspeed = ch->caps.minspeed;
212 ch->caps.fmtlist = vchan_fmt;
213 ch->caps.caps = 0;
214
215 return &ch->caps;
216 }
217
218 static kobj_method_t vchan_methods[] = {
219 KOBJMETHOD(channel_init, vchan_init),
220 KOBJMETHOD(channel_free, vchan_free),
221 KOBJMETHOD(channel_setformat, vchan_setformat),
222 KOBJMETHOD(channel_setspeed, vchan_setspeed),
223 KOBJMETHOD(channel_setblocksize, vchan_setblocksize),
224 KOBJMETHOD(channel_trigger, vchan_trigger),
225 KOBJMETHOD(channel_getcaps, vchan_getcaps),
226 { 0, 0 }
227 };
228 CHANNEL_DECLARE(vchan);
229
230 /* virtual channel interface */
231
232 int
233 vchan_create(struct pcm_channel *parent)
234 {
235 struct snddev_info *d = parent->parentsnddev;
236 struct pcmchan_children *pce;
237 struct pcm_channel *child;
238 int err, first;
239
240 pce = malloc(sizeof(*pce), M_DEVBUF, M_WAITOK | M_ZERO);
241 if (!pce) {
242 return ENOMEM;
243 }
244
245 /* create a new playback channel */
246 child = pcm_chn_create(d, parent, &vchan_class, PCMDIR_VIRTUAL, parent);
247 if (!child) {
248 free(pce, M_DEVBUF);
249 return ENODEV;
250 }
251
252 CHN_LOCK(parent);
253 if (!(parent->flags & CHN_F_BUSY)) {
254 CHN_UNLOCK(parent);
255 return EBUSY;
256 }
257
258 first = SLIST_EMPTY(&parent->children);
259 /* add us to our parent channel's children */
260 pce->channel = child;
261 SLIST_INSERT_HEAD(&parent->children, pce, link);
262 CHN_UNLOCK(parent);
263
264 /* add us to our grandparent's channel list */
265 err = pcm_chn_add(d, child, !first);
266 if (err) {
267 pcm_chn_destroy(child);
268 free(pce, M_DEVBUF);
269 }
270
271 /* XXX gross ugly hack, murder death kill */
272 if (first && !err) {
273 err = chn_reset(parent, AFMT_STEREO | AFMT_S16_LE);
274 if (err)
275 printf("chn_reset: %d\n", err);
276 err = chn_setspeed(parent, 44100);
277 if (err)
278 printf("chn_setspeed: %d\n", err);
279 }
280
281 return err;
282 }
283
284 int
285 vchan_destroy(struct pcm_channel *c)
286 {
287 struct pcm_channel *parent = c->parentchannel;
288 struct snddev_info *d = parent->parentsnddev;
289 struct pcmchan_children *pce;
290 int err, last;
291
292 CHN_LOCK(parent);
293 if (!(parent->flags & CHN_F_BUSY)) {
294 CHN_UNLOCK(parent);
295 return EBUSY;
296 }
297 if (SLIST_EMPTY(&parent->children)) {
298 CHN_UNLOCK(parent);
299 return EINVAL;
300 }
301
302 /* remove us from our parent's children list */
303 SLIST_FOREACH(pce, &parent->children, link) {
304 if (pce->channel == c)
305 goto gotch;
306 }
307 CHN_UNLOCK(parent);
308 return EINVAL;
309 gotch:
310 SLIST_REMOVE(&parent->children, pce, pcmchan_children, link);
311 free(pce, M_DEVBUF);
312
313 last = SLIST_EMPTY(&parent->children);
314 if (last)
315 parent->flags &= ~CHN_F_BUSY;
316
317 /* remove us from our grantparent's channel list */
318 err = pcm_chn_remove(d, c, !last);
319 if (err)
320 return err;
321
322 CHN_UNLOCK(parent);
323 /* destroy ourselves */
324 err = pcm_chn_destroy(c);
325
326 return err;
327 }
328
329 int
330 vchan_initsys(device_t dev)
331 {
332 #ifdef SND_DYNSYSCTL
333 struct snddev_info *d;
334
335 d = device_get_softc(dev);
336 SYSCTL_ADD_PROC(snd_sysctl_tree(dev), SYSCTL_CHILDREN(snd_sysctl_tree_top(dev)),
337 OID_AUTO, "vchans", CTLTYPE_INT | CTLFLAG_RW, d, sizeof(d),
338 sysctl_hw_snd_vchans, "I", "");
339 #endif
340
341 return 0;
342 }
343
344
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