d5d093bd10
Obtained from: https://web.archive.org/web/20090620082249/http://worldserver.oleane.com/rsn/ascd-en.html
372 lines
8.4 KiB
C
372 lines
8.4 KiB
C
/*
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* $Id: plat_sun_cdda.c,v 1.3 1999/03/07 08:36:41 dirk Exp $
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*
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* This file is part of WorkMan, the civilized CD player library
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* (c) 1991-1997 by Steven Grimm (original author)
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* (c) by Dirk Försterling (current 'author' = maintainer)
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* The maintainer can be contacted by his e-mail address:
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* milliByte@DeathsDoor.com
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*
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* Sun (really Solaris) CDDA functions.
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*/
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#include "include/wm_config.h"
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#if defined(sun) && defined(SYSV) && defined(BUILD_CDDA) /* { */
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static char plat_sun_cdda_id[] = "$Id: plat_sun_cdda.c,v 1.3 1999/03/07 08:36:41 dirk Exp $";
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#include "include/wm_cdda.h"
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/* types.h and cdio.h are included by wmcdda.h */
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#include <stdio.h>
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#include <math.h>
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#include <sys/ioctl.h>
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#include <malloc.h>
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#include <errno.h>
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#define WM_MSG_CLASS WM_MSG_CLASS_PLATFORM
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#define CDDABLKSIZE 2368
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#define SAMPLES_PER_BLK 588
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/* Address of next block to read. */
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int current_position = 0;
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/* Address of first and last blocks to read. */
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int starting_position = 0;
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int ending_position = 0;
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/* Playback direction. */
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int direction = 1;
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/* Number of blocks to read at once; initialize to the maximum. */
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/* (was 30. Set to 15 for INTeL. Maybe config option? */
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int numblocks = 15;
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/*
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* This is the fastest way to convert from BCD to 8-bit.
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*/
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unsigned char unbcd[256] = {
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0,0,0,0,0,0,
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10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 0,0,0,0,0,0,
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20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 0,0,0,0,0,0,
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30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 0,0,0,0,0,0,
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40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 0,0,0,0,0,0,
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50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 0,0,0,0,0,0,
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60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 0,0,0,0,0,0,
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70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 0,0,0,0,0,0,
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80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 0,0,0,0,0,0,
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90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 0,0,0,0,0,0,
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
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};
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/*
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* Initialize the CDDA data buffer and open the appropriate device.
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*
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* NOTE: We allocate twice as much space as we need to actually read a block;
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* this lets us do audio manipulations without bothering to malloc a second
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* buffer.
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*
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* Also, test to see if we can actually *do* CDDA on this drive; if not, we
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* need to exit right away so the UI doesn't show the user any CDDA controls.
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*/
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int
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wmcdda_init(char **bufadr, long *buflenadr, int init_fd, char *devname)
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{
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struct cdrom_cdda cdda;
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*bufadr = malloc(numblocks * CDDABLKSIZE * 2);
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if (*bufadr == NULL)
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return (-1);
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*buflenadr = numblocks * CDDABLKSIZE;
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/*init_fd = open(devname, 0);
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if (init_fd == -1)
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init_fd = open("/dev/rdsk/c0t6d0s2", 0);
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*/
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init_fd = wmcdda_open(devname);
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if (init_fd > -1)
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{
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cdda.cdda_addr = 200;
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cdda.cdda_length = 1;
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cdda.cdda_data = *bufadr;
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cdda.cdda_subcode = CDROM_DA_SUBQ;
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if (ioctl(init_fd, CDROMCDDA, &cdda) < 0)
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{
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close(init_fd);
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init_fd = -1;
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}
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}
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return (init_fd);
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}
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/*
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* Try to open the CD device
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*/
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int
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wmcdda_open(char *devname)
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{
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int fd;
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fd = open(devname, 0);
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if (fd == -1)
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fd = open("/dev/rdsk/c0t6d0s2", 0);
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return(fd);
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}
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/*
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* Close the CD-ROM device in preparation for exiting.
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*/
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void
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wmcdda_close(int fd)
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{
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close(fd);
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}
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/*
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* Set up for playing the CD. Actually this doesn't play a thing, just sets a
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* couple variables so we'll know what to do when we're called.
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*/
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void
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wmcdda_setup(int start, int end, int realstart)
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{
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current_position = start - 150;
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ending_position = end - 150;
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starting_position = realstart - 150;
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/*
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* Special case: don't start at the "end" of a track if we're
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* playing backwards!
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*/
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if (direction == -1 && start == realstart)
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current_position = ending_position - numblocks;
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}
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/*
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* Read some blocks from the CD. Stop if we hit the end of the current region.
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*
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* Returns number of bytes read, -1 on error, 0 if stopped for a benign reason.
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*/
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long
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wmcdda_read(int fd, unsigned char *rawbuf, long buflen,
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struct cdda_block *block)
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{
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struct cdrom_cdda cdda;
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int blk;
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unsigned char *q;
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extern int speed;
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if ((direction > 0 && current_position >= ending_position) ||
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(direction < 0 && current_position < starting_position))
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{
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block->status = WMCDDA_DONE;
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return (0);
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}
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cdda.cdda_addr = current_position;
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if (ending_position && current_position + numblocks > ending_position)
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cdda.cdda_length = ending_position - current_position;
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else
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cdda.cdda_length = numblocks;
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cdda.cdda_data = rawbuf;
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cdda.cdda_subcode = CDROM_DA_SUBQ;
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if (ioctl(fd, CDROMCDDA, &cdda) < 0)
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{
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if (errno == ENXIO) /* CD ejected! */
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{
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block->status = WMCDDA_EJECTED;
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return (-1);
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}
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if (current_position + numblocks > ending_position)
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{
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/*
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* Hit the end of the CD, probably.
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*/
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block->status = WMCDDA_DONE;
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return (0);
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}
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/* Sometimes it fails once, dunno why */
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if (ioctl(fd, CDROMCDDA, &cdda) < 0)
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{
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if (ioctl(fd, CDROMCDDA, &cdda) < 0)
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{
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if (ioctl(fd, CDROMCDDA, &cdda) < 0)
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{
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perror("CDROMCDDA");
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block->status = WMCDDA_ERROR;
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return (-1);
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}
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}
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}
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}
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if (speed > 148)
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{
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/*
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* We want speed=148 to advance by cdda_length, but
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* speed=256 to advance cdda_length * 4.
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*/
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current_position = current_position +
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(cdda.cdda_length * direction * (speed - 112)) / 36;
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}
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else
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current_position = current_position +
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cdda.cdda_length * direction;
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for (blk = 0; blk < numblocks; blk++)
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{
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/*
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* New valid Q-subchannel information? Update the block
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* status.
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*/
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q = &rawbuf[blk * CDDABLKSIZE + SAMPLES_PER_BLK * 4];
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if (*q == 1)
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{
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block->status = WMCDDA_OK;
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block->track = unbcd[q[1]];
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block->index = unbcd[q[2]];
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block->minute = unbcd[q[7]];
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block->second = unbcd[q[8]];
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block->frame = unbcd[q[9]];
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}
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}
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return (cdda.cdda_length * CDDABLKSIZE);
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}
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/*
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* Normalize a bunch of CDDA data. Basically this means ripping out the
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* Q subchannel data and doing byte-swapping, since the CD audio is in
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* littleendian format.
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*
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* Scanning is handled here too.
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*
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* XXX - do byte swapping on Intel boxes?
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*/
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long
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wmcdda_normalize(unsigned char *rawbuf, long buflen, struct cdda_block *block)
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{
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int i, nextq;
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int blocks = buflen / CDDABLKSIZE;
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unsigned char *dest = rawbuf;
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unsigned char tmp;
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long *buf32 = (long *)rawbuf, tmp32;
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/*
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* this was #ifndef LITTLEENDIAN
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* in wmcdda it was called LITTLE_ENDIAN. Was this a flaw?
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*/
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#if WM_BIG_ENDIAN
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if (blocks--)
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for (i = 0; i < SAMPLES_PER_BLK * 2; i++)
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{
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/* Only need to use temp buffer on first block. */
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tmp = *rawbuf++;
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*dest++ = *rawbuf++;
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*dest++ = tmp;
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}
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#endif
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while (blocks--)
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{
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/* Skip over Q data. */
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rawbuf += 16;
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for (i = 0; i < SAMPLES_PER_BLK * 2; i++)
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{
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#if WM_LITTLE_ENDIAN
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*dest++ = *rawbuf++;
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*dest++ = *rawbuf++;
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#else
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*dest++ = rawbuf[1];
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*dest++ = rawbuf[0];
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rawbuf += 2;
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#endif
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}
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}
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buflen -= ((buflen / CDDABLKSIZE) * 16);
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/*
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* Reverse the data here if we're playing backwards.
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* XXX - ideally this should be done above.
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*/
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if (direction < 0)
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{
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buflen /= 4; /* we can move 32 bits at a time. */
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for (i = 0; i < buflen / 2; i++)
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{
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tmp32 = buf32[i];
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buf32[i] = buf32[buflen - i - 1];
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buf32[buflen - i - 1] = tmp32;
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}
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buflen *= 4;
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}
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return (buflen);
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}
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/*
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* Set the playback direction.
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*/
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void
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wmcdda_direction(int newdir)
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{
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if (newdir == 0)
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{
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numblocks = 20;
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direction = 1;
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}
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else
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{
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numblocks = 30;
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direction = -1;
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}
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}
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/*
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* Do system-specific stuff to get ready to play at a particular speed.
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*/
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void
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wmcdda_speed(int speed)
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{
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if (speed > 128)
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numblocks = 12;
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else
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numblocks = direction > 0 ? 20 : 30;
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}
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#endif /* } */
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