1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364
|
/*
* $Id: plat_linux_cdda.c,v 1.3.4.1 1999/01/15 08:47:35 dirk Exp $
*
* This file is part of WorkMan, the civilized CD player program
* (c) 1991-1997 by Steven Grimm (original author)
* (c) by Dirk F"orsterling (current 'author' = maintainer)
* The maintainer can be contacted by his e-mail address:
* milliByte@DeathsDoor.com
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* Linux CDDA functions. Derived from the SUN module.
*/
#include "config.h"
#if defined(linux) && defined(BUILD_CDDA) /* { */
static char plat_linux_cdda_id[] = "$Id: plat_linux_cdda.c,v 1.3.4.1 1999/01/15 08:47:35 dirk Exp $";
#include "wmcdda.h"
/* types.h and cdio.h are included by wmcdda.h */
#include <stdio.h>
#include <math.h>
#include <sys/ioctl.h>
#include <malloc.h>
#include <errno.h>
#define CDDABLKSIZE 2368
#define SAMPLES_PER_BLK 588
/* Address of next block to read. */
int current_position = 0;
/* Address of first and last blocks to read. */
int starting_position = 0;
int ending_position = 0;
/* Playback direction. */
int direction = 1;
/* Number of blocks to read at once; initialize to the maximum. */
int numblocks = 30;
/*
* This is the fastest way to convert from BCD to 8-bit.
*/
unsigned char unbcd[256] = {
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0,0,0,0,0,0,
10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 0,0,0,0,0,0,
20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 0,0,0,0,0,0,
30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 0,0,0,0,0,0,
40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 0,0,0,0,0,0,
50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 0,0,0,0,0,0,
60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 0,0,0,0,0,0,
70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 0,0,0,0,0,0,
80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 0,0,0,0,0,0,
90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
};
/*
* Initialize the CDDA data buffer and open the appropriate device.
*
* NOTE: We allocate twice as much space as we need to actually read a block;
* this lets us do audio manipulations without bothering to malloc a second
* buffer.
*
* Also, test to see if we can actually *do* CDDA on this drive; if not, we
* need to exit right away so the UI doesn't show the user any CDDA controls.
*/
int
wmcdda_init(char **bufadr, long *buflenadr, int init_fd, char *devname)
{
struct cdrom_cdda cdda;
*bufadr = malloc(numblocks * CDDABLKSIZE * 2);
if (*bufadr == NULL)
return (-1);
*buflenadr = numblocks * CDDABLKSIZE;
/*init_fd = open(devname, 0);
if (init_fd == -1)
init_fd = open("/dev/rdsk/c0t6d0s2", 0);
*/
init_fd = wmcdda_open(devname);
if (init_fd > -1)
{
cdda.cdda_addr = 200;
cdda.cdda_length = 1;
cdda.cdda_data = *bufadr;
cdda.cdda_subcode = CDROM_DA_SUBQ;
if (ioctl(init_fd, CDROMCDDA, &cdda) < 0)
{
close(init_fd);
init_fd = -1;
}
}
return (init_fd);
}
/*
* Try to open the CD device
*/
int
wmcdda_open(char *devname)
{
int fd;
fd = open(devname, 0);
if (fd == -1)
fd = open("/dev/rdsk/c0t6d0s2", 0);
return(fd);
}
/*
* Close the CD-ROM device in preparation for exiting.
*/
void
wmcdda_close(int fd)
{
close(fd);
}
/*
* Set up for playing the CD. Actually this doesn't play a thing, just sets a
* couple variables so we'll know what to do when we're called.
*/
void
wmcdda_setup(int start, int end, int realstart)
{
current_position = start - 150;
ending_position = end - 150;
starting_position = realstart - 150;
/*
* Special case: don't start at the "end" of a track if we're
* playing backwards!
*/
if (direction == -1 && start == realstart)
current_position = ending_position - numblocks;
}
/*
* Read some blocks from the CD. Stop if we hit the end of the current region.
*
* Returns number of bytes read, -1 on error, 0 if stopped for a benign reason.
*/
long
wmcdda_read(int fd, unsigned char *rawbuf, long buflen,
struct cdda_block *block)
{
struct cdrom_cdda cdda;
int blk;
unsigned char *q;
extern int speed;
if ((direction > 0 && current_position >= ending_position) ||
(direction < 0 && current_position < starting_position))
{
block->status = WMCDDA_DONE;
return (0);
}
cdda.cdda_addr = current_position;
if (ending_position && current_position + numblocks > ending_position)
cdda.cdda_length = ending_position - current_position;
else
cdda.cdda_length = numblocks;
cdda.cdda_data = rawbuf;
cdda.cdda_subcode = CDROM_DA_SUBQ;
if (ioctl(fd, CDROMCDDA, &cdda) < 0)
{
if (errno == ENXIO) /* CD ejected! */
{
block->status = WMCDDA_EJECTED;
return (-1);
}
if (current_position + numblocks > ending_position)
{
/*
* Hit the end of the CD, probably.
*/
block->status = WMCDDA_DONE;
return (0);
}
/* Sometimes it fails once, dunno why */
if (ioctl(fd, CDROMCDDA, &cdda) < 0)
{
if (ioctl(fd, CDROMCDDA, &cdda) < 0)
{
if (ioctl(fd, CDROMCDDA, &cdda) < 0)
{
perror("CDROMCDDA");
block->status = WMCDDA_ERROR;
return (-1);
}
}
}
}
if (speed > 148)
{
/*
* We want speed=148 to advance by cdda_length, but
* speed=256 to advance cdda_length * 4.
*/
current_position = current_position +
(cdda.cdda_length * direction * (speed - 112)) / 36;
}
else
current_position = current_position +
cdda.cdda_length * direction;
for (blk = 0; blk < numblocks; blk++)
{
/*
* New valid Q-subchannel information? Update the block
* status.
*/
q = &rawbuf[blk * CDDABLKSIZE + SAMPLES_PER_BLK * 4];
if (*q == 1)
{
block->status = WMCDDA_OK;
block->track = unbcd[q[1]];
block->index = unbcd[q[2]];
block->minute = unbcd[q[7]];
block->second = unbcd[q[8]];
block->frame = unbcd[q[9]];
}
}
return (cdda.cdda_length * CDDABLKSIZE);
}
/*
* Normalize a bunch of CDDA data. Basically this means ripping out the
* Q subchannel data and doing byte-swapping, since the CD audio is in
* littleendian format.
*
* Scanning is handled here too.
*
* XXX - do byte swapping on Intel boxes?
*/
long
wmcdda_normalize(unsigned char *rawbuf, long buflen, struct cdda_block *block)
{
int i, nextq;
int blocks = buflen / CDDABLKSIZE;
unsigned char *dest = rawbuf;
unsigned char tmp;
long *buf32 = (long *)rawbuf, tmp32;
/*
* this was #ifndef LITTLEENDIAN
* in wmcdda it was called LITTLE_ENDIAN. Was this a flaw?
*/
#if WM_BIG_ENDIAN
if (blocks--)
for (i = 0; i < SAMPLES_PER_BLK * 2; i++)
{
/* Only need to use temp buffer on first block. */
tmp = *rawbuf++;
*dest++ = *rawbuf++;
*dest++ = tmp;
}
#endif
while (blocks--)
{
/* Skip over Q data. */
rawbuf += 16;
for (i = 0; i < SAMPLES_PER_BLK * 2; i++)
{
#if WM_LITTLE_ENDIAN
*dest++ = *rawbuf++;
*dest++ = *rawbuf++;
#else
*dest++ = rawbuf[1];
*dest++ = rawbuf[0];
rawbuf += 2;
#endif
}
}
buflen -= ((buflen / CDDABLKSIZE) * 16);
/*
* Reverse the data here if we're playing backwards.
* XXX - ideally this should be done above.
*/
if (direction < 0)
{
buflen /= 4; /* we can move 32 bits at a time. */
for (i = 0; i < buflen / 2; i++)
{
tmp32 = buf32[i];
buf32[i] = buf32[buflen - i - 1];
buf32[buflen - i - 1] = tmp32;
}
buflen *= 4;
}
return (buflen);
}
/*
* Set the playback direction.
*/
void
wmcdda_direction(int newdir)
{
if (newdir == 0)
{
numblocks = 20;
direction = 1;
}
else
{
numblocks = 30;
direction = -1;
}
}
/*
* Do system-specific stuff to get ready to play at a particular speed.
*/
void
wmcdda_speed(int speed)
{
if (speed > 128)
numblocks = 12;
else
numblocks = direction > 0 ? 20 : 30;
}
#endif /* } */
|