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tdemultimedia/kscd/libwm/plat_linux_cdda.c

254 lines
6.0 KiB

/*
* $Id$
*
* This file is part of WorkMan, the civilized CD player library
* (c) 1991-1997 by Steven Grimm (original author)
* (c) by Dirk F<EFBFBD>sterling (current 'author' = maintainer)
* The maintainer can be contacted by his e-mail address:
* milliByte@DeathsDoor.com
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*
* Linux CDDA functions. Derived from the SUN module.
*/
#include "include/wm_cdda.h"
#if defined(__linux__) && defined(BUILD_CDDA)
#ifndef __GNUC__
#define __GNUC__ 1
#endif
/* needed for vanilla kernel headers, which do provide __u64 only
for ansi */
#undef __STRICT_ANSI__
/* needed for non-ansi kernel headers */
#define asm __asm__
#define inline __inline__
#include <asm/types.h>
#include <linux/cdrom.h>
#undef asm
#undef inline
#include <stdio.h>
#include <math.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include "include/wm_struct.h"
#include "include/wm_cdda.h"
#define WM_MSG_CLASS WM_MSG_CLASS_PLATFORM
#define CDDABLKSIZE 2352
/* Address of next block to read. */
static int current_position;
/* Address of last block to read. */
static int ending_position;
static struct cdrom_read_audio cdda;
static long wmcdda_normalize(struct cdda_block *block);
/*
* Initialize the CDDA data buffer and open the appropriate device.
*
*/
int
wmcdda_init(struct cdda_device* pdev)
{
int i;
if (pdev->fd > -1)
return -1;
if(!pdev->devname)
return -1;
for (i = 0; i < pdev->numblocks; i++) {
/* in Linux const */
pdev->blocks[i].buflen = pdev->frames_at_once * CDDABLKSIZE;
pdev->blocks[i].buf = malloc(pdev->blocks[i].buflen);
if (!pdev->blocks[i].buf) {
ERRORLOG("wmcdda_init ENOMEM\n");
return -ENOMEM;
}
}
pdev->fd = open(pdev->devname, O_RDONLY | O_NONBLOCK);
if (pdev->fd > -1) {
cdda.addr_format = CDROM_LBA;
cdda.addr.lba = 200;
cdda.nframes = 1;
cdda.buf = (unsigned char*)pdev->blocks[0].buf;
pdev->status = WM_CDM_STOPPED;
if((ioctl(pdev->fd, CDROMREADAUDIO, &cdda) < 0)) {
if (errno == ENXIO) {
/* CD ejected! */
pdev->status = WM_CDM_EJECTED;
return 0;
} else {
/* Sometimes it fails once, dunno why */
pdev->status = WM_CDM_CDDAERROR;
return 0;
}
}
} else {
ERRORLOG("canot open device, errno %i\n", errno);
pdev->status = WM_CDM_UNKNOWN;
return -1;
}
pdev->status = WM_CDM_UNKNOWN;
return 0;
}
/*
* Close the CD-ROM device in preparation for exiting.
*/
int
wmcdda_close(struct cdda_device* pdev)
{
int i;
if(-1 == pdev->fd)
return -1;
close(pdev->fd);
pdev->fd = -1;
for (i = 0; i < pdev->numblocks; i++) {
free(pdev->blocks[i].buf);
pdev->blocks[i].buf = 0;
pdev->blocks[i].buflen = 0;
}
return 0;
}
/*
* 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.
*/
int
wmcdda_setup(int start, int end, int realstart)
{
current_position = start;
ending_position = end;
return 0;
}
/*
* 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(struct cdda_device* pdev, struct cdda_block *block)
{
if (pdev->fd < 0 && wmcdda_init(pdev)) {
return -1;
}
/* Hit the end of the CD, probably. */
if (current_position >= ending_position) {
block->status = WM_CDM_TRACK_DONE;
return 0;
}
cdda.addr_format = CDROM_LBA;
cdda.addr.lba = current_position - CD_MSF_OFFSET;
if (ending_position && current_position + pdev->frames_at_once > ending_position)
cdda.nframes = ending_position - current_position;
else
cdda.nframes = pdev->frames_at_once;
cdda.buf = (unsigned char*)block->buf;
if (ioctl(pdev->fd, CDROMREADAUDIO, &cdda) < 0) {
if (errno == ENXIO) {
/* CD ejected! */
block->status = WM_CDM_EJECTED;
return 0;
} else {
/* Sometimes it fails once, dunno why */
block->status = WM_CDM_CDDAERROR;
return 0;
}
}
block->track = -1;
block->index = 0;
block->frame = current_position;
block->status = WM_CDM_PLAYING;
block->buflen = cdda.nframes * CDDABLKSIZE;
current_position = current_position + cdda.nframes;
return wmcdda_normalize(block);
}
/*
* Normalize a bunch of CDDA data. Basically this means doing byte-swapping, since the CD audio is in
* littleendian format.
*/
long
wmcdda_normalize(struct cdda_block *block)
{
#if WM_BIG_ENDIAN
int i;
int blocks = block->buflen / CDDABLKSIZE;
char *rawbuf = block->buf;
char *dest = block->buf;
while (blocks--) {
for (i = 0; i < CDDABLKSIZE / 2; i++) {
*dest++ = rawbuf[1];
*dest++ = rawbuf[0];
rawbuf += 2;
}
}
#endif
return block->buflen;
}
/*
* Set the playback direction.
*/
void
wmcdda_direction(int newdir)
{
}
/*
* Do system-specific stuff to get ready to play at a particular speed.
*/
void
wmcdda_speed(int speed)
{
}
#endif