sound/core/oss/route.c

   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 typedef struct ttable_dst ttable_dst_t;
  39 typedef struct route_private_data route_t;
  40
  41 typedef void (*route_channel_f)(snd_pcm_plugin_t *plugin,
  42                               const snd_pcm_plugin_channel_t *src_channels,
  43                               snd_pcm_plugin_channel_t *dst_channel,
  44                               ttable_dst_t* ttable, snd_pcm_uframes_t frames);
  45
  46 typedef struct {
  47         int channel;
  48         int as_int;
  49 } ttable_src_t;
  50
  51 struct ttable_dst {
  52         int att;        /* Attenuated */
  53         unsigned int nsrcs;
  54         ttable_src_t* srcs;
  55         route_channel_f func;
  56 };
  57
  58 struct route_private_data {
  59         enum {R_UINT32=0, R_UINT64=1} sum_type;
  60         int get, put;
  61         int conv;
  62         int src_sample_size;
  63         ttable_dst_t ttable[0];
  64 };
  65
  66 typedef union {
  67         u_int32_t as_uint32;
  68         u_int64_t as_uint64;
  69 } sum_t;
  70
  71
  72 static void route_to_channel_from_zero(snd_pcm_plugin_t *plugin,
  73                                      const snd_pcm_plugin_channel_t *src_channels ATTRIBUTE_UNUSED,
  74                                      snd_pcm_plugin_channel_t *dst_channel,
  75                                      ttable_dst_t* ttable ATTRIBUTE_UNUSED, 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(snd_pcm_plugin_t *plugin,
  83                                     const snd_pcm_plugin_channel_t *src_channels,
  84                                     snd_pcm_plugin_channel_t *dst_channel,
  85                                     ttable_dst_t* ttable, snd_pcm_uframes_t frames)
  86 {
  87 #define CONV_LABELS
  88 #include "plugin_ops.h"
  89 #undef CONV_LABELS
  90         route_t *data = (route_t *)plugin->extra_data;
  91         void *conv;
  92         const snd_pcm_plugin_channel_t *src_channel = NULL;
  93         unsigned int srcidx;
  94         char *src, *dst;
  95         int src_step, dst_step;
  96         for (srcidx = 0; srcidx < ttable->nsrcs; ++srcidx) {
  97                 src_channel = &src_channels[ttable->srcs[srcidx].channel];
  98                 if (src_channel->area.addr != NULL)
  99                         break;
 100         }
 101         if (srcidx == ttable->nsrcs) {
 102                 route_to_channel_from_zero(plugin, src_channels, dst_channel, ttable, frames);
 103                 return;
 104         }
 105
 106         dst_channel->enabled = 1;
 107         conv = conv_labels[data->conv];
 108         src = src_channel->area.addr + src_channel->area.first / 8;
 109         src_step = src_channel->area.step / 8;
 110         dst = dst_channel->area.addr + dst_channel->area.first / 8;
 111         dst_step = dst_channel->area.step / 8;
 112         while (frames-- > 0) {
 113                 goto *conv;
 114 #define CONV_END after
 115 #include "plugin_ops.h"
 116 #undef CONV_END
 117         after:
 118                 src += src_step;
 119                 dst += dst_step;
 120         }
 121 }
 122
 123 static void route_to_channel(snd_pcm_plugin_t *plugin,
 124                            const snd_pcm_plugin_channel_t *src_channels,
 125                            snd_pcm_plugin_channel_t *dst_channel,
 126                            ttable_dst_t* ttable, snd_pcm_uframes_t frames)
 127 {
 128 #define GET_U_LABELS
 129 #define PUT_U32_LABELS
 130 #include "plugin_ops.h"
 131 #undef GET_U_LABELS
 132 #undef PUT_U32_LABELS
 133         static void *zero_labels[2] = { &&zero_int32, &&zero_int64 };
 134         /* sum_type att */
 135         static void *add_labels[2 * 2] = { &&add_int32_noatt, &&add_int32_att,
 136                                     &&add_int64_noatt, &&add_int64_att,
 137         };
 138         /* sum_type att shift */
 139         static void *norm_labels[2 * 2 * 4] = { NULL,
 140                                          &&norm_int32_8_noatt,
 141                                          &&norm_int32_16_noatt,
 142                                          &&norm_int32_24_noatt,
 143                                          NULL,
 144                                          &&norm_int32_8_att,
 145                                          &&norm_int32_16_att,
 146                                          &&norm_int32_24_att,
 147                                          &&norm_int64_0_noatt,
 148                                          &&norm_int64_8_noatt,
 149                                          &&norm_int64_16_noatt,
 150                                          &&norm_int64_24_noatt,
 151                                          &&norm_int64_0_att,
 152                                          &&norm_int64_8_att,
 153                                          &&norm_int64_16_att,
 154                                          &&norm_int64_24_att,
 155         };
 156         route_t *data = (route_t *)plugin->extra_data;
 157         void *zero, *get, *add, *norm, *put_u32;
 158         int nsrcs = ttable->nsrcs;
 159         char *dst;
 160         int dst_step;
 161         char *srcs[nsrcs];
 162         int src_steps[nsrcs];
 163         ttable_src_t src_tt[nsrcs];
 164         u_int32_t sample = 0;
 165         int srcidx, srcidx1 = 0;
 166         for (srcidx = 0; srcidx < nsrcs; ++srcidx) {
 167                 const snd_pcm_plugin_channel_t *src_channel = &src_channels[ttable->srcs[srcidx].channel];
 168                 if (!src_channel->enabled)
 169                         continue;
 170                 srcs[srcidx1] = src_channel->area.addr + src_channel->area.first / 8;
 171                 src_steps[srcidx1] = src_channel->area.step / 8;
 172                 src_tt[srcidx1] = ttable->srcs[srcidx];
 173                 srcidx1++;
 174         }
 175         nsrcs = srcidx1;
 176         if (nsrcs == 0) {
 177                 route_to_channel_from_zero(plugin, src_channels, dst_channel, ttable, frames);
 178                 return;
 179         } else if (nsrcs == 1 && src_tt[0].as_int == ROUTE_PLUGIN_RESOLUTION) {
 180                 route_to_channel_from_one(plugin, src_channels, dst_channel, ttable, frames);
 181                 return;
 182         }
 183
 184         dst_channel->enabled = 1;
 185         zero = zero_labels[data->sum_type];
 186         get = get_u_labels[data->get];
 187         add = add_labels[data->sum_type * 2 + ttable->att];
 188         norm = norm_labels[data->sum_type * 8 + ttable->att * 4 + 4 - data->src_sample_size];
 189         put_u32 = put_u32_labels[data->put];
 190         dst = dst_channel->area.addr + dst_channel->area.first / 8;
 191         dst_step = dst_channel->area.step / 8;
 192
 193         while (frames-- > 0) {
 194                 ttable_src_t *ttp = src_tt;
 195                 sum_t sum;
 196
 197                 /* Zero sum */
 198                 goto *zero;
 199         zero_int32:
 200                 sum.as_uint32 = 0;
 201                 goto zero_end;
 202         zero_int64:
 203                 sum.as_uint64 = 0;
 204                 goto zero_end;
 205         zero_end:
 206                 for (srcidx = 0; srcidx < nsrcs; ++srcidx) {
 207                         char *src = srcs[srcidx];
 208
 209                         /* Get sample */
 210                         goto *get;
 211 #define GET_U_END after_get
 212 #include "plugin_ops.h"
 213 #undef GET_U_END
 214                 after_get:
 215
 216                         /* Sum */
 217                         goto *add;
 218                 add_int32_att:
 219                         sum.as_uint32 += sample * ttp->as_int;
 220                         goto after_sum;
 221                 add_int32_noatt:
 222                         if (ttp->as_int)
 223                                 sum.as_uint32 += sample;
 224                         goto after_sum;
 225                 add_int64_att:
 226                         sum.as_uint64 += (u_int64_t) sample * ttp->as_int;
 227                         goto after_sum;
 228                 add_int64_noatt:
 229                         if (ttp->as_int)
 230                                 sum.as_uint64 += sample;
 231                         goto after_sum;
 232                 after_sum:
 233                         srcs[srcidx] += src_steps[srcidx];
 234                         ttp++;
 235                 }
 236
 237                 /* Normalization */
 238                 goto *norm;
 239         norm_int32_8_att:
 240                 sum.as_uint64 = sum.as_uint32;
 241         norm_int64_8_att:
 242                 sum.as_uint64 <<= 8;
 243         norm_int64_0_att:
 244                 div(sum.as_uint64);
 245                 goto norm_int;
 246
 247         norm_int32_16_att:
 248                 sum.as_uint64 = sum.as_uint32;
 249         norm_int64_16_att:
 250                 sum.as_uint64 <<= 16;
 251                 div(sum.as_uint64);
 252                 goto norm_int;
 253
 254         norm_int32_24_att:
 255                 sum.as_uint64 = sum.as_uint32;
 256         norm_int64_24_att:
 257                 sum.as_uint64 <<= 24;
 258                 div(sum.as_uint64);
 259                 goto norm_int;
 260
 261         norm_int32_8_noatt:
 262                 sum.as_uint64 = sum.as_uint32;
 263         norm_int64_8_noatt:
 264                 sum.as_uint64 <<= 8;
 265                 goto norm_int;
 266
 267         norm_int32_16_noatt:
 268                 sum.as_uint64 = sum.as_uint32;
 269         norm_int64_16_noatt:
 270                 sum.as_uint64 <<= 16;
 271                 goto norm_int;
 272
 273         norm_int32_24_noatt:
 274                 sum.as_uint64 = sum.as_uint32;
 275         norm_int64_24_noatt:
 276                 sum.as_uint64 <<= 24;
 277                 goto norm_int;
 278
 279         norm_int64_0_noatt:
 280         norm_int:
 281                 if (sum.as_uint64 > (u_int32_t)0xffffffff)
 282                         sample = (u_int32_t)0xffffffff;
 283                 else
 284                         sample = sum.as_uint64;
 285                 goto after_norm;
 286
 287         after_norm:
 288
 289                 /* Put sample */
 290                 goto *put_u32;
 291 #define PUT_U32_END after_put_u32
 292 #include "plugin_ops.h"
 293 #undef PUT_U32_END
 294         after_put_u32:
 295
 296                 dst += dst_step;
 297         }
 298 }
 299
 300 static int route_src_channels_mask(snd_pcm_plugin_t *plugin,
 301                                    bitset_t *dst_vmask,
 302                                    bitset_t **src_vmask)
 303 {
 304         route_t *data = (route_t *)plugin->extra_data;
 305         int schannels = plugin->src_format.channels;
 306         int dchannels = plugin->dst_format.channels;
 307         bitset_t *vmask = plugin->src_vmask;
 308         int channel;
 309         ttable_dst_t *dp = data->ttable;
 310         bitset_zero(vmask, schannels);
 311         for (channel = 0; channel < dchannels; channel++, dp++) {
 312                 unsigned int src;
 313                 ttable_src_t *sp;
 314                 if (!bitset_get(dst_vmask, channel))
 315                         continue;
 316                 sp = dp->srcs;
 317                 for (src = 0; src < dp->nsrcs; src++, sp++)
 318                         bitset_set(vmask, sp->channel);
 319         }
 320         *src_vmask = vmask;
 321         return 0;
 322 }
 323
 324 static int route_dst_channels_mask(snd_pcm_plugin_t *plugin,
 325                                    bitset_t *src_vmask,
 326                                    bitset_t **dst_vmask)
 327 {
 328         route_t *data = (route_t *)plugin->extra_data;
 329         int dchannels = plugin->dst_format.channels;
 330         bitset_t *vmask = plugin->dst_vmask;
 331         int channel;
 332         ttable_dst_t *dp = data->ttable;
 333         bitset_zero(vmask, dchannels);
 334         for (channel = 0; channel < dchannels; channel++, dp++) {
 335                 unsigned int src;
 336                 ttable_src_t *sp;
 337                 sp = dp->srcs;
 338                 for (src = 0; src < dp->nsrcs; src++, sp++) {
 339                         if (bitset_get(src_vmask, sp->channel)) {
 340                                 bitset_set(vmask, channel);
 341                                 break;
 342                         }
 343                 }
 344         }
 345         *dst_vmask = vmask;
 346         return 0;
 347 }
 348
 349 static void route_free(snd_pcm_plugin_t *plugin)
 350 {
 351         route_t *data = (route_t *)plugin->extra_data;
 352         unsigned int dst_channel;
 353         for (dst_channel = 0; dst_channel < plugin->dst_format.channels; ++dst_channel) {
 354                 kfree(data->ttable[dst_channel].srcs);
 355         }
 356 }
 357
 358 static int route_load_ttable(snd_pcm_plugin_t *plugin,
 359                              const route_ttable_entry_t* src_ttable)
 360 {
 361         route_t *data;
 362         unsigned int src_channel, dst_channel;
 363         const route_ttable_entry_t *sptr;
 364         ttable_dst_t *dptr;
 365         if (src_ttable == NULL)
 366                 return 0;
 367         data = (route_t *)plugin->extra_data;
 368         dptr = data->ttable;
 369         sptr = src_ttable;
 370         plugin->private_free = route_free;
 371         for (dst_channel = 0; dst_channel < plugin->dst_format.channels; ++dst_channel) {
 372                 route_ttable_entry_t t = 0;
 373                 int att = 0;
 374                 int nsrcs = 0;
 375                 ttable_src_t srcs[plugin->src_format.channels];
 376                 for (src_channel = 0; src_channel < plugin->src_format.channels; ++src_channel) {
 377                         snd_assert(*sptr >= 0 || *sptr <= FULL, return -ENXIO);
 378                         if (*sptr != 0) {
 379                                 srcs[nsrcs].channel = src_channel;
 380                                 srcs[nsrcs].as_int = *sptr;
 381                                 if (*sptr != FULL)
 382                                         att = 1;
 383                                 t += *sptr;
 384                                 nsrcs++;
 385                         }
 386                         sptr++;
 387                 }
 388                 dptr->att = att;
 389                 dptr->nsrcs = nsrcs;
 390                 if (nsrcs == 0)
 391                         dptr->func = route_to_channel_from_zero;
 392                 else if (nsrcs == 1 && !att)
 393                         dptr->func = route_to_channel_from_one;
 394                 else
 395                         dptr->func = route_to_channel;
 396                 if (nsrcs > 0) {
 397                         int srcidx;
 398                         dptr->srcs = kcalloc(nsrcs, sizeof(*srcs), GFP_KERNEL);
 399                         for(srcidx = 0; srcidx < nsrcs; srcidx++)
 400                                 dptr->srcs[srcidx] = srcs[srcidx];
 401                 } else
 402                         dptr->srcs = NULL;
 403                 dptr++;
 404         }
 405         return 0;
 406 }
 407
 408 static snd_pcm_sframes_t route_transfer(snd_pcm_plugin_t *plugin,
 409                               const snd_pcm_plugin_channel_t *src_channels,
 410                               snd_pcm_plugin_channel_t *dst_channels,
 411                               snd_pcm_uframes_t frames)
 412 {
 413         route_t *data;
 414         int src_nchannels, dst_nchannels;
 415         int dst_channel;
 416         ttable_dst_t *ttp;
 417         snd_pcm_plugin_channel_t *dvp;
 418
 419         snd_assert(plugin != NULL && src_channels != NULL && dst_channels != NULL, return -ENXIO);
 420         if (frames == 0)
 421                 return 0;
 422         data = (route_t *)plugin->extra_data;
 423
 424         src_nchannels = plugin->src_format.channels;
 425         dst_nchannels = plugin->dst_format.channels;
 426
 427 #ifdef CONFIG_SND_DEBUG
 428         {
 429                 int src_channel;
 430                 for (src_channel = 0; src_channel < src_nchannels; ++src_channel) {
 431                         snd_assert(src_channels[src_channel].area.first % 8 == 0 ||
 432                                    src_channels[src_channel].area.step % 8 == 0,
 433                                    return -ENXIO);
 434                 }
 435                 for (dst_channel = 0; dst_channel < dst_nchannels; ++dst_channel) {
 436                         snd_assert(dst_channels[dst_channel].area.first % 8 == 0 ||
 437                                    dst_channels[dst_channel].area.step % 8 == 0,
 438                                    return -ENXIO);
 439                 }
 440         }
 441 #endif
 442
 443         ttp = data->ttable;
 444         dvp = dst_channels;
 445         for (dst_channel = 0; dst_channel < dst_nchannels; ++dst_channel) {
 446                 ttp->func(plugin, src_channels, dvp, ttp, frames);
 447                 dvp++;
 448                 ttp++;
 449         }
 450         return frames;
 451 }
 452
 453 int getput_index(int format)
 454 {
 455         int sign, width, endian;
 456         sign = !snd_pcm_format_signed(format);
 457         width = snd_pcm_format_width(format) / 8 - 1;
 458         if (width < 0 || width > 3) {
 459                 snd_printk(KERN_ERR "snd-pcm-oss: invalid format %d\n", format);
 460                 width = 0;
 461         }
 462 #ifdef SNDRV_LITTLE_ENDIAN
 463         endian = snd_pcm_format_big_endian(format);
 464 #else
 465         endian = snd_pcm_format_little_endian(format);
 466 #endif
 467         if (endian < 0)
 468                 endian = 0;
 469         return width * 4 + endian * 2 + sign;
 470 }
 471
 472 int snd_pcm_plugin_build_route(snd_pcm_plug_t *plug,
 473                                snd_pcm_plugin_format_t *src_format,
 474                                snd_pcm_plugin_format_t *dst_format,
 475                                route_ttable_entry_t *ttable,
 476                                snd_pcm_plugin_t **r_plugin)
 477 {
 478         route_t *data;
 479         snd_pcm_plugin_t *plugin;
 480         int err;
 481
 482         snd_assert(r_plugin != NULL, return -ENXIO);
 483         *r_plugin = NULL;
 484         snd_assert(src_format->rate == dst_format->rate, return -ENXIO);
 485         snd_assert(snd_pcm_format_linear(src_format->format) != 0 &&
 486                    snd_pcm_format_linear(dst_format->format) != 0,
 487                    return -ENXIO);
 488
 489         err = snd_pcm_plugin_build(plug, "attenuated route conversion",
 490                                    src_format, dst_format,
 491                                    sizeof(route_t) + sizeof(data->ttable[0]) * dst_format->channels,
 492                                    &plugin);
 493         if (err < 0)
 494                 return err;
 495
 496         data = (route_t *) plugin->extra_data;
 497
 498         data->get = getput_index(src_format->format);
 499         snd_assert(data->get >= 0 && data->get < 4*2*2, return -EINVAL);
 500         data->put = getput_index(dst_format->format);
 501         snd_assert(data->get >= 0 && data->get < 4*2*2, return -EINVAL);
 502         data->conv = conv_index(src_format->format, dst_format->format);
 503
 504         if (snd_pcm_format_width(src_format->format) == 32)
 505                 data->sum_type = R_UINT64;
 506         else
 507                 data->sum_type = R_UINT32;
 508         data->src_sample_size = snd_pcm_format_width(src_format->format) / 8;
 509
 510         if ((err = route_load_ttable(plugin, ttable)) < 0) {
 511                 snd_pcm_plugin_free(plugin);
 512                 return err;
 513         }
 514         plugin->transfer = route_transfer;
 515         plugin->src_channels_mask = route_src_channels_mask;
 516         plugin->dst_channels_mask = route_dst_channels_mask;
 517         *r_plugin = plugin;
 518         return 0;
 519 }