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linux_dvd.c
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linux_dvd.c
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/*
* Linux DVD drive support
* Copyright (C) 2010 Andreas Öman
*
* 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 3 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.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <linux/cdrom.h>
#include "showtime.h"
#include "misc/callout.h"
#include "navigator.h"
#include "backend/backend.h"
#include "media.h"
#include "dvd.h"
#include "service.h"
typedef enum {
DISC_NO_DRIVE,
DISC_NO_DISC,
DISC_ISOFS,
DISC_AUDIO,
DISC_UNKNOWN_TYPE,
} disc_status_t;
typedef struct disc_scanner {
callout_t ds_timer;
disc_status_t ds_status;
char ds_title[40];
char *ds_dev;
service_t *ds_svc;
} disc_scanner_t;
/**
*
*/
static void
set_status(disc_scanner_t *ds, disc_status_t status, const char *title)
{
char buf[64];
char url[URL_MAX];
if(ds->ds_status == status)
return;
ds->ds_status = status;
if(ds->ds_svc != NULL) {
service_destroy(ds->ds_svc);
ds->ds_svc = NULL;
}
switch(status) {
case DISC_NO_DRIVE:
case DISC_NO_DISC:
break;
case DISC_AUDIO:
snprintf(buf, sizeof(buf), "Audio CD");
snprintf(url, sizeof(url), "audiocd:%s", ds->ds_dev);
ds->ds_svc = service_create(url, buf, url, "music", NULL, 0, 1,
SVC_ORIGIN_MEDIA);
break;
case DISC_ISOFS:
snprintf(buf, sizeof(buf), "DVD: %s", title);
snprintf(url, sizeof(url), "dvd:%s", ds->ds_dev);
ds->ds_svc = service_create(url, buf, url, "video", NULL, 0, 1,
SVC_ORIGIN_MEDIA);
break;
case DISC_UNKNOWN_TYPE:
#if 0 /* FIXME: Must not pass url as NULL */
snprintf(buf, sizeof(buf), "Unknown disc");
ds->ds_svc = service_create(ds->ds_dev, buf, NULL, SVC_TYPE_VIDEO, NULL, 0);
#endif
break;
}
}
/**
*
*/
static void
check_disc_type(disc_scanner_t *ds, int fd)
{
switch(ioctl(fd, CDROM_DISC_STATUS, NULL)) {
case CDS_AUDIO:
case CDS_MIXED:
set_status(ds, DISC_AUDIO, NULL);
return;
case CDS_DATA_1:
lseek(fd, 0x8000, SEEK_SET);
char buf[2048];
int r = read(fd, buf, 2048);
if(r == 2048) {
char *p = &buf[40];
while(*p > 32 && p != &buf[72])
p++;
*p = 0;
set_status(ds, DISC_ISOFS, buf + 40);
return;
}
break;
default:
break;
}
set_status(ds, DISC_UNKNOWN_TYPE, NULL);
}
/**
*
*/
static void
dvdprobe(callout_t *co, void *aux)
{
disc_scanner_t *ds = aux;
int fd;
callout_arm(&ds->ds_timer, dvdprobe, ds, 1);
fd = open(ds->ds_dev, O_RDONLY | O_NONBLOCK);
if(fd == -1) {
set_status(ds, DISC_NO_DRIVE, NULL);
} else {
if(ioctl(fd, CDROM_DRIVE_STATUS, NULL) == CDS_DISC_OK) {
if(ds->ds_svc == NULL)
check_disc_type(ds, fd);
} else {
set_status(ds, DISC_NO_DISC, NULL);
}
close(fd);
}
}
/**
*
*/
static int
be_dvd_canhandle(const char *url)
{
return !strncmp(url, "dvd:", strlen("dvd:"));
}
/**
*
*/
static event_t *
be_dvd_play(const char *url, media_pipe_t *mp,
int flags, int priority,
char *errstr, size_t errlen,
const char *mimetype,
const char *canonical_url,
struct video_queue *vq)
{
event_t *e;
if(strncmp(url, "dvd:", strlen("dvd:"))) {
snprintf(errstr, errlen, "dvd: Invalid URL");
return NULL;
}
url += 4;
e = dvd_play(url, mp, errstr, errlen, 0);
if(e != NULL && event_is_action(e, ACTION_EJECT)) {
int fd = open(url, O_RDONLY | O_NONBLOCK);
if(fd != -1) {
if(ioctl(fd, CDROMEJECT, NULL))
TRACE(TRACE_ERROR, "DVD", "Eject of %s failed -- %s",
url, strerror(errno));
close(fd);
} else {
TRACE(TRACE_ERROR, "DVD", "Unable to open %s for eject -- %s",
url, strerror(errno));
}
}
return e;
}
/**
*
*/
static int
be_dvd_init(void)
{
disc_scanner_t *ds = calloc(1, sizeof(disc_scanner_t));
ds->ds_dev = strdup("/dev/dvd");
callout_arm(&ds->ds_timer, dvdprobe, ds, 0);
return 0;
}
/**
*
*/
static backend_t be_dvd = {
.be_canhandle = be_dvd_canhandle,
.be_open = backend_open_video,
.be_play_video = be_dvd_play,
.be_init = be_dvd_init,
};
BE_REGISTER(dvd);