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/*
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* $Id$
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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 F<>sterling (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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*
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* Linux CDDA functions. Derived from the SUN module.
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*/
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#include <stdlib.h>
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#include "include/wm_cdda.h"
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#if defined(__linux__) && defined(BUILD_CDDA)
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#ifndef __GNUC__
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#define __GNUC__ 1
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#endif
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/* needed for vanilla kernel headers, which do provide __u64 only
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for ansi */
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#undef __STRICT_ANSI__
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/* needed for non-ansi kernel headers */
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#define asm __asm__
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#define inline __inline__
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#include <asm/types.h>
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#include <linux/cdrom.h>
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#undef asm
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#undef inline
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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 <sys/types.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include "include/wm_struct.h"
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#include "include/wm_cdda.h"
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#define WM_MSG_CLASS WM_MSG_CLASS_PLATFORM
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#define CDDABLKSIZE 2352
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/* Address of next block to read. */
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static int current_position;
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/* Address of last block to read. */
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static int ending_position;
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static struct cdrom_read_audio cdda;
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static long wmcdda_normalize(struct cdda_block *block);
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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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*/
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int
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wmcdda_init(struct cdda_device* pdev)
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{
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int i;
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if (pdev->fd > -1)
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return -1;
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if(!pdev->devname)
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return -1;
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for (i = 0; i < pdev->numblocks; i++) {
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/* in Linux const */
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pdev->blocks[i].buflen = pdev->frames_at_once * CDDABLKSIZE;
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pdev->blocks[i].buf = malloc(pdev->blocks[i].buflen);
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if (!pdev->blocks[i].buf) {
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ERRORLOG("wmcdda_init ENOMEM\n");
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return -ENOMEM;
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}
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}
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pdev->fd = open(pdev->devname, O_RDONLY | O_NONBLOCK);
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if (pdev->fd > -1) {
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cdda.addr_format = CDROM_LBA;
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cdda.addr.lba = 200;
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cdda.nframes = 1;
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cdda.buf = (unsigned char*)pdev->blocks[0].buf;
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pdev->status = WM_CDM_STOPPED;
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if((ioctl(pdev->fd, CDROMREADAUDIO, &cdda) < 0)) {
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if (errno == ENXIO) {
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/* CD ejected! */
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pdev->status = WM_CDM_EJECTED;
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return 0;
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} else {
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/* Sometimes it fails once, dunno why */
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pdev->status = WM_CDM_CDDAERROR;
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return 0;
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}
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}
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} else {
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ERRORLOG("canot open device, errno %i\n", errno);
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pdev->status = WM_CDM_UNKNOWN;
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return -1;
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}
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pdev->status = WM_CDM_UNKNOWN;
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return 0;
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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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int
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wmcdda_close(struct cdda_device* pdev)
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{
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int i;
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if(-1 == pdev->fd)
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return -1;
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close(pdev->fd);
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pdev->fd = -1;
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for (i = 0; i < pdev->numblocks; i++) {
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free(pdev->blocks[i].buf);
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pdev->blocks[i].buf = 0;
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pdev->blocks[i].buflen = 0;
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}
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return 0;
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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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int
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wmcdda_setup(int start, int end, int realstart)
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{
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current_position = start;
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ending_position = end;
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return 0;
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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(struct cdda_device* pdev, struct cdda_block *block)
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{
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if (pdev->fd < 0 && wmcdda_init(pdev)) {
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return -1;
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}
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/* Hit the end of the CD, probably. */
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if (current_position >= ending_position) {
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block->status = WM_CDM_TRACK_DONE;
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return 0;
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}
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cdda.addr_format = CDROM_LBA;
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cdda.addr.lba = current_position - CD_MSF_OFFSET;
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if (ending_position && current_position + pdev->frames_at_once > ending_position)
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cdda.nframes = ending_position - current_position;
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else
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cdda.nframes = pdev->frames_at_once;
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cdda.buf = (unsigned char*)block->buf;
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if (ioctl(pdev->fd, CDROMREADAUDIO, &cdda) < 0) {
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if (errno == ENXIO) {
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/* CD ejected! */
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block->status = WM_CDM_EJECTED;
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return 0;
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} else {
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/* Sometimes it fails once, dunno why */
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block->status = WM_CDM_CDDAERROR;
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return 0;
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}
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}
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block->track = -1;
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block->index = 0;
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block->frame = current_position;
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block->status = WM_CDM_PLAYING;
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block->buflen = cdda.nframes * CDDABLKSIZE;
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current_position = current_position + cdda.nframes;
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return wmcdda_normalize(block);
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}
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/*
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* Normalize a bunch of CDDA data. Basically this means doing byte-swapping, since the CD audio is in
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* littleendian format.
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*/
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long
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wmcdda_normalize(struct cdda_block *block)
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{
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#if WM_BIG_ENDIAN
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int i;
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int blocks = block->buflen / CDDABLKSIZE;
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char *rawbuf = block->buf;
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char *dest = block->buf;
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while (blocks--) {
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for (i = 0; i < CDDABLKSIZE / 2; i++) {
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*dest++ = rawbuf[1];
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*dest++ = rawbuf[0];
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rawbuf += 2;
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}
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}
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#endif
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return block->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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}
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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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}
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#endif
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