diff options
Diffstat (limited to 'kscd/libwm/plat_linux_cdda.c')
| -rw-r--r-- | kscd/libwm/plat_linux_cdda.c | 253 |
1 files changed, 253 insertions, 0 deletions
diff --git a/kscd/libwm/plat_linux_cdda.c b/kscd/libwm/plat_linux_cdda.c new file mode 100644 index 00000000..6456e10a --- /dev/null +++ b/kscd/libwm/plat_linux_cdda.c @@ -0,0 +1,253 @@ +/* + * $Id$ + * + * This file is part of WorkMan, the civilized CD player library + * (c) 1991-1997 by Steven Grimm (original author) + * (c) by Dirk F�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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 |