ascd/libworkman/plat_linux_cdda.c

   1 /*
   2  * $Id: plat_linux_cdda.c,v 1.3 1999/03/07 08:36:40 dirk Exp $
   3  *
   4  * This file is part of WorkMan, the civilized CD player library
   5  * (c) 1991-1997 by Steven Grimm (original author)
   6  * (c) by Dirk Försterling (current 'author' = maintainer)
   7  * The maintainer can be contacted by his e-mail address:
   8  * milliByte@DeathsDoor.com
   9  *
  10  * This library is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU Library General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2 of the License, or (at your option) any later version.
  14  *
  15  * This library is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * Library General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Library General Public
  21  * License along with this library; if not, write to the Free
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23  *
  24  *
  25  * Linux CDDA functions. Derived from the SUN module.
  26  */
  27
  28 #include "include/wm_config.h"
  29
  30 #if defined(linux) && defined(BUILD_CDDA) /* { */
  31
  32 static char plat_linux_cdda_id[] = "$Id: plat_linux_cdda.c,v 1.3 1999/03/07 08:36:40 dirk Exp $";
  33
  34
  35 #include "include/wm_cdda.h"
  36 /* types.h and cdio.h are included by wmcdda.h */
  37
  38 #include <stdio.h>
  39 #include <math.h>
  40 #include <sys/ioctl.h>
  41 #include <malloc.h>
  42 #include <errno.h>
  43
  44 #define WM_MSG_CLASS WM_MSG_CLASS_PLATFORM
  45
  46 #define CDDABLKSIZE 2368
  47 #define SAMPLES_PER_BLK 588
  48
  49 /* Address of next block to read. */
  50 int     current_position = 0;
  51
  52 /* Address of first and last blocks to read. */
  53 int     starting_position = 0;
  54 int     ending_position = 0;
  55
  56 /* Playback direction. */
  57 int     direction = 1;
  58
  59 /* Number of blocks to read at once; initialize to the maximum. */
  60 int     numblocks = 30;
  61
  62 /*
  63  * This is the fastest way to convert from BCD to 8-bit.
  64  */
  65 unsigned char unbcd[256] = {
  66   0,  1,  2,  3,  4,  5,  6,  7,  8,  9,  0,0,0,0,0,0,
  67  10, 11, 12, 13, 14, 15, 16, 17, 18, 19,  0,0,0,0,0,0,
  68  20, 21, 22, 23, 24, 25, 26, 27, 28, 29,  0,0,0,0,0,0,
  69  30, 31, 32, 33, 34, 35, 36, 37, 38, 39,  0,0,0,0,0,0,
  70  40, 41, 42, 43, 44, 45, 46, 47, 48, 49,  0,0,0,0,0,0,
  71  50, 51, 52, 53, 54, 55, 56, 57, 58, 59,  0,0,0,0,0,0,
  72  60, 61, 62, 63, 64, 65, 66, 67, 68, 69,  0,0,0,0,0,0,
  73  70, 71, 72, 73, 74, 75, 76, 77, 78, 79,  0,0,0,0,0,0,
  74  80, 81, 82, 83, 84, 85, 86, 87, 88, 89,  0,0,0,0,0,0,
  75  90, 91, 92, 93, 94, 95, 96, 97, 98, 99,  0,0,0,0,0,0,
  76  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  77  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  78  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  79  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  80  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  81  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
  82 };
  83
  84 /*
  85  * Initialize the CDDA data buffer and open the appropriate device.
  86  *
  87  * NOTE: We allocate twice as much space as we need to actually read a block;
  88  * this lets us do audio manipulations without bothering to malloc a second
  89  * buffer.
  90  *
  91  * Also, test to see if we can actually *do* CDDA on this drive; if not, we
  92  * need to exit right away so the UI doesn't show the user any CDDA controls.
  93  */
  94 int
  95 wmcdda_init(char **bufadr, long *buflenadr, int init_fd, char *devname)
  96 {
  97         struct cdrom_cdda       cdda;
  98
  99         *bufadr = malloc(numblocks * CDDABLKSIZE * 2);
 100         if (*bufadr == NULL)
 101                 return (-1);
 102
 103         *buflenadr = numblocks * CDDABLKSIZE;
 104
 105         /*init_fd = open(devname, 0);
 106         if (init_fd == -1)
 107                 init_fd = open("/dev/rdsk/c0t6d0s2", 0);
 108         */
 109         init_fd = wmcdda_open(devname);
 110
 111         if (init_fd > -1)
 112         {
 113                 cdda.cdda_addr = 200;
 114                 cdda.cdda_length = 1;
 115                 cdda.cdda_data = *bufadr;
 116                 cdda.cdda_subcode = CDROM_DA_SUBQ;
 117
 118                 if (ioctl(init_fd, CDROMCDDA, &cdda) < 0)
 119                 {
 120                         close(init_fd);
 121                         init_fd = -1;
 122                 }
 123         }
 124
 125         return (init_fd);
 126 }
 127
 128 /*
 129  * Try to open the CD device
 130  */
 131 int
 132 wmcdda_open(char *devname)
 133 {
 134     int fd;
 135
 136     fd = open(devname, 0);
 137     if (fd == -1)
 138         fd = open("/dev/rdsk/c0t6d0s2", 0);
 139
 140     return(fd);
 141 }
 142
 143
 144 /*
 145  * Close the CD-ROM device in preparation for exiting.
 146  */
 147 void
 148 wmcdda_close(int fd)
 149 {
 150         close(fd);
 151 }
 152
 153 /*
 154  * Set up for playing the CD.  Actually this doesn't play a thing, just sets a
 155  * couple variables so we'll know what to do when we're called.
 156  */
 157 void
 158 wmcdda_setup(int start, int end, int realstart)
 159 {
 160         current_position = start - 150;
 161         ending_position = end - 150;
 162         starting_position = realstart - 150;
 163
 164         /*
 165          * Special case: don't start at the "end" of a track if we're
 166          * playing backwards!
 167          */
 168         if (direction == -1 && start == realstart)
 169                 current_position = ending_position - numblocks;
 170 }
 171
 172 /*
 173  * Read some blocks from the CD.  Stop if we hit the end of the current region.
 174  *
 175  * Returns number of bytes read, -1 on error, 0 if stopped for a benign reason.
 176  */
 177 long
 178 wmcdda_read(int fd, unsigned char *rawbuf, long buflen,
 179         struct cdda_block *block)
 180 {
 181         struct cdrom_cdda       cdda;
 182         int                     blk;
 183         unsigned char           *q;
 184         extern int              speed;
 185
 186         if ((direction > 0 && current_position >= ending_position) ||
 187             (direction < 0 && current_position < starting_position))
 188         {
 189                 block->status = WMCDDA_DONE;
 190                 return (0);
 191         }
 192
 193         cdda.cdda_addr = current_position;
 194         if (ending_position && current_position + numblocks > ending_position)
 195                 cdda.cdda_length = ending_position - current_position;
 196         else
 197                 cdda.cdda_length = numblocks;
 198         cdda.cdda_data = rawbuf;
 199         cdda.cdda_subcode = CDROM_DA_SUBQ;
 200
 201         if (ioctl(fd, CDROMCDDA, &cdda) < 0)
 202         {
 203                 if (errno == ENXIO)     /* CD ejected! */
 204                 {
 205                         block->status = WMCDDA_EJECTED;
 206                         return (-1);
 207                 }
 208
 209                 if (current_position + numblocks > ending_position)
 210                 {
 211                         /*
 212                          * Hit the end of the CD, probably.
 213                          */
 214                         block->status = WMCDDA_DONE;
 215                         return (0);
 216                 }
 217
 218                 /* Sometimes it fails once, dunno why */
 219                 if (ioctl(fd, CDROMCDDA, &cdda) < 0)
 220                 {
 221                         if (ioctl(fd, CDROMCDDA, &cdda) < 0)
 222                         {
 223                                 if (ioctl(fd, CDROMCDDA, &cdda) < 0)
 224                                 {
 225                                         perror("CDROMCDDA");
 226                                         block->status = WMCDDA_ERROR;
 227                                         return (-1);
 228                                 }
 229                         }
 230                 }
 231         }
 232
 233         if (speed > 148)
 234         {
 235                 /*
 236                  * We want speed=148 to advance by cdda_length, but
 237                  * speed=256 to advance cdda_length * 4.
 238                  */
 239                 current_position = current_position +
 240                         (cdda.cdda_length * direction * (speed - 112)) / 36;
 241         }
 242         else
 243                 current_position = current_position +
 244                         cdda.cdda_length * direction;
 245
 246         for (blk = 0; blk < numblocks; blk++)
 247         {
 248                 /*
 249                  * New valid Q-subchannel information?  Update the block
 250                  * status.
 251                  */
 252                 q = &rawbuf[blk * CDDABLKSIZE + SAMPLES_PER_BLK * 4];
 253                 if (*q == 1)
 254                 {
 255                         block->status = WMCDDA_OK;
 256                         block->track =  unbcd[q[1]];
 257                         block->index =  unbcd[q[2]];
 258                         block->minute = unbcd[q[7]];
 259                         block->second = unbcd[q[8]];
 260                         block->frame =  unbcd[q[9]];
 261                 }
 262         }
 263
 264         return (cdda.cdda_length * CDDABLKSIZE);
 265 }
 266
 267 /*
 268  * Normalize a bunch of CDDA data.  Basically this means ripping out the
 269  * Q subchannel data and doing byte-swapping, since the CD audio is in
 270  * littleendian format.
 271  *
 272  * Scanning is handled here too.
 273  *
 274  * XXX - do byte swapping on Intel boxes?
 275  */
 276 long
 277 wmcdda_normalize(unsigned char *rawbuf, long buflen, struct cdda_block *block)
 278 {
 279         int             i, nextq;
 280         int             blocks = buflen / CDDABLKSIZE;
 281         unsigned char   *dest = rawbuf;
 282         unsigned char   tmp;
 283         long            *buf32 = (long *)rawbuf, tmp32;
 284
 285 /*
 286  * this was #ifndef LITTLEENDIAN
 287  * in wmcdda it was called LITTLE_ENDIAN. Was this a flaw?
 288  */
 289 #if WM_BIG_ENDIAN
 290         if (blocks--)
 291                 for (i = 0; i < SAMPLES_PER_BLK * 2; i++)
 292                 {
 293                         /* Only need to use temp buffer on first block. */
 294                         tmp = *rawbuf++;
 295                         *dest++ = *rawbuf++;
 296                         *dest++ = tmp;
 297                 }
 298 #endif
 299
 300         while (blocks--)
 301         {
 302                 /* Skip over Q data. */
 303                 rawbuf += 16;
 304
 305                 for (i = 0; i < SAMPLES_PER_BLK * 2; i++)
 306                 {
 307 #if WM_LITTLE_ENDIAN
 308                         *dest++ = *rawbuf++;
 309                         *dest++ = *rawbuf++;
 310 #else
 311                         *dest++ = rawbuf[1];
 312                         *dest++ = rawbuf[0];
 313                         rawbuf += 2;
 314 #endif
 315                 }
 316         }
 317
 318         buflen -= ((buflen / CDDABLKSIZE) * 16);
 319
 320         /*
 321          * Reverse the data here if we're playing backwards.
 322          * XXX - ideally this should be done above.
 323          */
 324         if (direction < 0)
 325         {
 326                 buflen /= 4;    /* we can move 32 bits at a time. */
 327
 328                 for (i = 0; i < buflen / 2; i++)
 329                 {
 330                         tmp32 = buf32[i];
 331                         buf32[i] = buf32[buflen - i - 1];
 332                         buf32[buflen - i - 1] = tmp32;
 333                 }
 334
 335                 buflen *= 4;
 336         }
 337
 338         return (buflen);
 339 }
 340
 341 /*
 342  * Set the playback direction.
 343  */
 344 void
 345 wmcdda_direction(int newdir)
 346 {
 347         if (newdir == 0)
 348         {
 349                 numblocks = 20;
 350                 direction = 1;
 351         }
 352         else
 353         {
 354                 numblocks = 30;
 355                 direction = -1;
 356         }
 357 }
 358
 359 /*
 360  * Do system-specific stuff to get ready to play at a particular speed.
 361  */
 362 void
 363 wmcdda_speed(int speed)
 364 {
 365         if (speed > 128)
 366                 numblocks = 12;
 367         else
 368                 numblocks = direction > 0 ? 20 : 30;
 369 }
 370
 371 #endif /* } */