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[IPV6]: ROUTE: Split up rt6_cow() for future changes.
[linux-2.6/verdex.git] / sound / core / oss / route.c
blob726c5caa3fdb29df7caf198a394d38560901adf1
1 /*
2 * Attenuated route Plug-In
3 * Copyright (c) 2000 by Abramo Bagnara <abramo@alsa-project.org>
4 *
5 *
6 * This library is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU Library General Public License as
8 * published by the Free Software Foundation; either version 2 of
9 * the License, or (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU Library General Public License for more details.
15 *
16 * You should have received a copy of the GNU Library General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22 #include <sound/driver.h>
23 #include <linux/slab.h>
24 #include <linux/time.h>
25 #include <sound/core.h>
26 #include <sound/pcm.h>
27 #include "pcm_plugin.h"
28
29 /* The best possible hack to support missing optimization in gcc 2.7.2.3 */
30 #if ROUTE_PLUGIN_RESOLUTION & (ROUTE_PLUGIN_RESOLUTION - 1) != 0
31 #define div(a) a /= ROUTE_PLUGIN_RESOLUTION
32 #elif ROUTE_PLUGIN_RESOLUTION == 16
33 #define div(a) a >>= 4
34 #else
35 #error "Add some code here"
36 #endif
37
38 struct ttable_dst;
39
40 typedef void (*route_channel_f)(struct snd_pcm_plugin *plugin,
41 const struct snd_pcm_plugin_channel *src_channels,
42 struct snd_pcm_plugin_channel *dst_channel,
43 struct ttable_dst *ttable, snd_pcm_uframes_t frames);
44
45 struct ttable_src {
46 int channel;
47 int as_int;
48 };
49
50 struct ttable_dst {
51 int att; /* Attenuated */
52 unsigned int nsrcs;
53 struct ttable_src *srcs;
54 route_channel_f func;
55 };
56
57 struct route_priv {
58 enum {R_UINT32=0, R_UINT64=1} sum_type;
59 int get, put;
60 int conv;
61 int src_sample_size;
62 struct ttable_dst ttable[0];
63 };
64
65 union sum {
66 u_int32_t as_uint32;
67 u_int64_t as_uint64;
68 };
69
70
71 static void route_to_channel_from_zero(struct snd_pcm_plugin *plugin,
72 const struct snd_pcm_plugin_channel *src_channels,
73 struct snd_pcm_plugin_channel *dst_channel,
74 struct ttable_dst *ttable,
75 snd_pcm_uframes_t frames)
76 {
77 if (dst_channel->wanted)
78 snd_pcm_area_silence(&dst_channel->area, 0, frames, plugin->dst_format.format);
79 dst_channel->enabled = 0;
80 }
81
82 static void route_to_channel_from_one(struct snd_pcm_plugin *plugin,
83 const struct snd_pcm_plugin_channel *src_channels,
84 struct snd_pcm_plugin_channel *dst_channel,
85 struct ttable_dst *ttable,
86 snd_pcm_uframes_t frames)
87 {
88 #define CONV_LABELS
89 #include "plugin_ops.h"
90 #undef CONV_LABELS
91 struct route_priv *data = (struct route_priv *)plugin->extra_data;
92 void *conv;
93 const struct snd_pcm_plugin_channel *src_channel = NULL;
94 unsigned int srcidx;
95 char *src, *dst;
96 int src_step, dst_step;
97 for (srcidx = 0; srcidx < ttable->nsrcs; ++srcidx) {
98 src_channel = &src_channels[ttable->srcs[srcidx].channel];
99 if (src_channel->area.addr != NULL)
100 break;
101 }
102 if (srcidx == ttable->nsrcs) {
103 route_to_channel_from_zero(plugin, src_channels, dst_channel, ttable, frames);
104 return;
105 }
106
107 dst_channel->enabled = 1;
108 conv = conv_labels[data->conv];
109 src = src_channel->area.addr + src_channel->area.first / 8;
110 src_step = src_channel->area.step / 8;
111 dst = dst_channel->area.addr + dst_channel->area.first / 8;
112 dst_step = dst_channel->area.step / 8;
113 while (frames-- > 0) {
114 goto *conv;
115 #define CONV_END after
116 #include "plugin_ops.h"
117 #undef CONV_END
118 after:
119 src += src_step;
120 dst += dst_step;
121 }
122 }
123
124 static void route_to_channel(struct snd_pcm_plugin *plugin,
125 const struct snd_pcm_plugin_channel *src_channels,
126 struct snd_pcm_plugin_channel *dst_channel,
127 struct ttable_dst *ttable, snd_pcm_uframes_t frames)
128 {
129 #define GET_U_LABELS
130 #define PUT_U32_LABELS
131 #include "plugin_ops.h"
132 #undef GET_U_LABELS
133 #undef PUT_U32_LABELS
134 static void *zero_labels[2] = { &&zero_int32, &&zero_int64 };
135 /* sum_type att */
136 static void *add_labels[2 * 2] = { &&add_int32_noatt, &&add_int32_att,
137 &&add_int64_noatt, &&add_int64_att,
138 };
139 /* sum_type att shift */
140 static void *norm_labels[2 * 2 * 4] = { NULL,
141 &&norm_int32_8_noatt,
142 &&norm_int32_16_noatt,
143 &&norm_int32_24_noatt,
144 NULL,
145 &&norm_int32_8_att,
146 &&norm_int32_16_att,
147 &&norm_int32_24_att,
148 &&norm_int64_0_noatt,
149 &&norm_int64_8_noatt,
150 &&norm_int64_16_noatt,
151 &&norm_int64_24_noatt,
152 &&norm_int64_0_att,
153 &&norm_int64_8_att,
154 &&norm_int64_16_att,
155 &&norm_int64_24_att,
156 };
157 struct route_priv *data = (struct route_priv *)plugin->extra_data;
158 void *zero, *get, *add, *norm, *put_u32;
159 int nsrcs = ttable->nsrcs;
160 char *dst;
161 int dst_step;
162 char *srcs[nsrcs];
163 int src_steps[nsrcs];
164 struct ttable_src src_tt[nsrcs];
165 u_int32_t sample = 0;
166 int srcidx, srcidx1 = 0;
167 for (srcidx = 0; srcidx < nsrcs; ++srcidx) {
168 const struct snd_pcm_plugin_channel *src_channel = &src_channels[ttable->srcs[srcidx].channel];
169 if (!src_channel->enabled)
170 continue;
171 srcs[srcidx1] = src_channel->area.addr + src_channel->area.first / 8;
172 src_steps[srcidx1] = src_channel->area.step / 8;
173 src_tt[srcidx1] = ttable->srcs[srcidx];
174 srcidx1++;
175 }
176 nsrcs = srcidx1;
177 if (nsrcs == 0) {
178 route_to_channel_from_zero(plugin, src_channels, dst_channel, ttable, frames);
179 return;
180 } else if (nsrcs == 1 && src_tt[0].as_int == ROUTE_PLUGIN_RESOLUTION) {
181 route_to_channel_from_one(plugin, src_channels, dst_channel, ttable, frames);
182 return;
183 }
184
185 dst_channel->enabled = 1;
186 zero = zero_labels[data->sum_type];
187 get = get_u_labels[data->get];
188 add = add_labels[data->sum_type * 2 + ttable->att];
189 norm = norm_labels[data->sum_type * 8 + ttable->att * 4 + 4 - data->src_sample_size];
190 put_u32 = put_u32_labels[data->put];
191 dst = dst_channel->area.addr + dst_channel->area.first / 8;
192 dst_step = dst_channel->area.step / 8;
193
194 while (frames-- > 0) {
195 struct ttable_src *ttp = src_tt;
196 union sum sum;
197
198 /* Zero sum */
199 goto *zero;
200 zero_int32:
201 sum.as_uint32 = 0;
202 goto zero_end;
203 zero_int64:
204 sum.as_uint64 = 0;
205 goto zero_end;
206 zero_end:
207 for (srcidx = 0; srcidx < nsrcs; ++srcidx) {
208 char *src = srcs[srcidx];
209
210 /* Get sample */
211 goto *get;
212 #define GET_U_END after_get
213 #include "plugin_ops.h"
214 #undef GET_U_END
215 after_get:
216
217 /* Sum */
218 goto *add;
219 add_int32_att:
220 sum.as_uint32 += sample * ttp->as_int;
221 goto after_sum;
222 add_int32_noatt:
223 if (ttp->as_int)
224 sum.as_uint32 += sample;
225 goto after_sum;
226 add_int64_att:
227 sum.as_uint64 += (u_int64_t) sample * ttp->as_int;
228 goto after_sum;
229 add_int64_noatt:
230 if (ttp->as_int)
231 sum.as_uint64 += sample;
232 goto after_sum;
233 after_sum:
234 srcs[srcidx] += src_steps[srcidx];
235 ttp++;
236 }
237
238 /* Normalization */
239 goto *norm;
240 norm_int32_8_att:
241 sum.as_uint64 = sum.as_uint32;
242 norm_int64_8_att:
243 sum.as_uint64 <<= 8;
244 norm_int64_0_att:
245 div(sum.as_uint64);
246 goto norm_int;
247
248 norm_int32_16_att:
249 sum.as_uint64 = sum.as_uint32;
250 norm_int64_16_att:
251 sum.as_uint64 <<= 16;
252 div(sum.as_uint64);
253 goto norm_int;
254
255 norm_int32_24_att:
256 sum.as_uint64 = sum.as_uint32;
257 norm_int64_24_att:
258 sum.as_uint64 <<= 24;
259 div(sum.as_uint64);
260 goto norm_int;
261
262 norm_int32_8_noatt:
263 sum.as_uint64 = sum.as_uint32;
264 norm_int64_8_noatt:
265 sum.as_uint64 <<= 8;
266 goto norm_int;
267
268 norm_int32_16_noatt:
269 sum.as_uint64 = sum.as_uint32;
270 norm_int64_16_noatt:
271 sum.as_uint64 <<= 16;
272 goto norm_int;
273
274 norm_int32_24_noatt:
275 sum.as_uint64 = sum.as_uint32;
276 norm_int64_24_noatt:
277 sum.as_uint64 <<= 24;
278 goto norm_int;
279
280 norm_int64_0_noatt:
281 norm_int:
282 if (sum.as_uint64 > (u_int32_t)0xffffffff)
283 sample = (u_int32_t)0xffffffff;
284 else
285 sample = sum.as_uint64;
286 goto after_norm;
287
288 after_norm:
289
290 /* Put sample */
291 goto *put_u32;
292 #define PUT_U32_END after_put_u32
293 #include "plugin_ops.h"
294 #undef PUT_U32_END
295 after_put_u32:
296
297 dst += dst_step;
298 }
299 }
300
301 static int route_src_channels_mask(struct snd_pcm_plugin *plugin,
302 unsigned long *dst_vmask,
303 unsigned long **src_vmask)
304 {
305 struct route_priv *data = (struct route_priv *)plugin->extra_data;
306 int schannels = plugin->src_format.channels;
307 int dchannels = plugin->dst_format.channels;
308 unsigned long *vmask = plugin->src_vmask;
309 int channel;
310 struct ttable_dst *dp = data->ttable;
311 bitmap_zero(vmask, schannels);
312 for (channel = 0; channel < dchannels; channel++, dp++) {
313 unsigned int src;
314 struct ttable_src *sp;
315 if (!test_bit(channel, dst_vmask))
316 continue;
317 sp = dp->srcs;
318 for (src = 0; src < dp->nsrcs; src++, sp++)
319 set_bit(sp->channel, vmask);
320 }
321 *src_vmask = vmask;
322 return 0;
323 }
324
325 static int route_dst_channels_mask(struct snd_pcm_plugin *plugin,
326 unsigned long *src_vmask,
327 unsigned long **dst_vmask)
328 {
329 struct route_priv *data = (struct route_priv *)plugin->extra_data;
330 int dchannels = plugin->dst_format.channels;
331 unsigned long *vmask = plugin->dst_vmask;
332 int channel;
333 struct ttable_dst *dp = data->ttable;
334 bitmap_zero(vmask, dchannels);
335 for (channel = 0; channel < dchannels; channel++, dp++) {
336 unsigned int src;
337 struct ttable_src *sp;
338 sp = dp->srcs;
339 for (src = 0; src < dp->nsrcs; src++, sp++) {
340 if (test_bit(sp->channel, src_vmask)) {
341 set_bit(channel, vmask);
342 break;
343 }
344 }
345 }
346 *dst_vmask = vmask;
347 return 0;
348 }
349
350 static void route_free(struct snd_pcm_plugin *plugin)
351 {
352 struct route_priv *data = (struct route_priv *)plugin->extra_data;
353 unsigned int dst_channel;
354 for (dst_channel = 0; dst_channel < plugin->dst_format.channels; ++dst_channel) {
355 kfree(data->ttable[dst_channel].srcs);
356 }
357 }
358
359 static int route_load_ttable(struct snd_pcm_plugin *plugin,
360 const int *src_ttable)
361 {
362 struct route_priv *data;
363 unsigned int src_channel, dst_channel;
364 const int *sptr;
365 struct ttable_dst *dptr;
366 if (src_ttable == NULL)
367 return 0;
368 data = (struct route_priv *)plugin->extra_data;
369 dptr = data->ttable;
370 sptr = src_ttable;
371 plugin->private_free = route_free;
372 for (dst_channel = 0; dst_channel < plugin->dst_format.channels; ++dst_channel) {
373 int t = 0;
374 int att = 0;
375 int nsrcs = 0;
376 struct ttable_src srcs[plugin->src_format.channels];
377 for (src_channel = 0; src_channel < plugin->src_format.channels; ++src_channel) {
378 snd_assert(*sptr >= 0 || *sptr <= FULL, return -ENXIO);
379 if (*sptr != 0) {
380 srcs[nsrcs].channel = src_channel;
381 srcs[nsrcs].as_int = *sptr;
382 if (*sptr != FULL)
383 att = 1;
384 t += *sptr;
385 nsrcs++;
386 }
387 sptr++;
388 }
389 dptr->att = att;
390 dptr->nsrcs = nsrcs;
391 if (nsrcs == 0)
392 dptr->func = route_to_channel_from_zero;
393 else if (nsrcs == 1 && !att)
394 dptr->func = route_to_channel_from_one;
395 else
396 dptr->func = route_to_channel;
397 if (nsrcs > 0) {
398 int srcidx;
399 dptr->srcs = kcalloc(nsrcs, sizeof(*srcs), GFP_KERNEL);
400 for(srcidx = 0; srcidx < nsrcs; srcidx++)
401 dptr->srcs[srcidx] = srcs[srcidx];
402 } else
403 dptr->srcs = NULL;
404 dptr++;
405 }
406 return 0;
407 }
408
409 static snd_pcm_sframes_t route_transfer(struct snd_pcm_plugin *plugin,
410 const struct snd_pcm_plugin_channel *src_channels,
411 struct snd_pcm_plugin_channel *dst_channels,
412 snd_pcm_uframes_t frames)
413 {
414 struct route_priv *data;
415 int src_nchannels, dst_nchannels;
416 int dst_channel;
417 struct ttable_dst *ttp;
418 struct snd_pcm_plugin_channel *dvp;
419
420 snd_assert(plugin != NULL && src_channels != NULL && dst_channels != NULL, return -ENXIO);
421 if (frames == 0)
422 return 0;
423 data = (struct route_priv *)plugin->extra_data;
424
425 src_nchannels = plugin->src_format.channels;
426 dst_nchannels = plugin->dst_format.channels;
427
428 #ifdef CONFIG_SND_DEBUG
429 {
430 int src_channel;
431 for (src_channel = 0; src_channel < src_nchannels; ++src_channel) {
432 snd_assert(src_channels[src_channel].area.first % 8 == 0 ||
433 src_channels[src_channel].area.step % 8 == 0,
434 return -ENXIO);
435 }
436 for (dst_channel = 0; dst_channel < dst_nchannels; ++dst_channel) {
437 snd_assert(dst_channels[dst_channel].area.first % 8 == 0 ||
438 dst_channels[dst_channel].area.step % 8 == 0,
439 return -ENXIO);
440 }
441 }
442 #endif
443
444 ttp = data->ttable;
445 dvp = dst_channels;
446 for (dst_channel = 0; dst_channel < dst_nchannels; ++dst_channel) {
447 ttp->func(plugin, src_channels, dvp, ttp, frames);
448 dvp++;
449 ttp++;
450 }
451 return frames;
452 }
453
454 int getput_index(int format)
455 {
456 int sign, width, endian;
457 sign = !snd_pcm_format_signed(format);
458 width = snd_pcm_format_width(format) / 8 - 1;
459 if (width < 0 || width > 3) {
460 snd_printk(KERN_ERR "snd-pcm-oss: invalid format %d\n", format);
461 width = 0;
462 }
463 #ifdef SNDRV_LITTLE_ENDIAN
464 endian = snd_pcm_format_big_endian(format);
465 #else
466 endian = snd_pcm_format_little_endian(format);
467 #endif
468 if (endian < 0)
469 endian = 0;
470 return width * 4 + endian * 2 + sign;
471 }
472
473 int snd_pcm_plugin_build_route(struct snd_pcm_substream *plug,
474 struct snd_pcm_plugin_format *src_format,
475 struct snd_pcm_plugin_format *dst_format,
476 int *ttable,
477 struct snd_pcm_plugin **r_plugin)
478 {
479 struct route_priv *data;
480 struct snd_pcm_plugin *plugin;
481 int err;
482
483 snd_assert(r_plugin != NULL, return -ENXIO);
484 *r_plugin = NULL;
485 snd_assert(src_format->rate == dst_format->rate, return -ENXIO);
486 snd_assert(snd_pcm_format_linear(src_format->format) != 0 &&
487 snd_pcm_format_linear(dst_format->format) != 0,
488 return -ENXIO);
489
490 err = snd_pcm_plugin_build(plug, "attenuated route conversion",
491 src_format, dst_format,
492 sizeof(struct route_priv) +
493 sizeof(data->ttable[0]) * dst_format->channels,
494 &plugin);
495 if (err < 0)
496 return err;
497
498 data = (struct route_priv *)plugin->extra_data;
499
500 data->get = getput_index(src_format->format);
501 snd_assert(data->get >= 0 && data->get < 4*2*2, return -EINVAL);
502 data->put = getput_index(dst_format->format);
503 snd_assert(data->get >= 0 && data->get < 4*2*2, return -EINVAL);
504 data->conv = conv_index(src_format->format, dst_format->format);
505
506 if (snd_pcm_format_width(src_format->format) == 32)
507 data->sum_type = R_UINT64;
508 else
509 data->sum_type = R_UINT32;
510 data->src_sample_size = snd_pcm_format_width(src_format->format) / 8;
511
512 if ((err = route_load_ttable(plugin, ttable)) < 0) {
513 snd_pcm_plugin_free(plugin);
514 return err;
515 }
516 plugin->transfer = route_transfer;
517 plugin->src_channels_mask = route_src_channels_mask;
518 plugin->dst_channels_mask = route_dst_channels_mask;
519 *r_plugin = plugin;
520 return 0;
521 }
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