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/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation version 2.1 of the License.
*
* 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
* Or, point your browser to http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
*
* These routines were written as part of the dvb-apps, as:
* util functions for various ?zap implementations
*
* Copyright (C) 2001 Johannes Stezenbach (js@convergence.de)
* for convergence integrated media
*
* Originally licensed as GPLv2 or upper
*
* All subsequent changes are under GPLv2 only and are:
* Copyright (c) 2011-2012 - Mauro Carvalho Chehab
*
*/
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include <time.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h> /* free */
#include <libdvbv5/dvb-demux.h>
#include <libdvbv5/dvb-dev.h>
#define MAX_TIME 10 /* 1.0 seconds */
#define xioctl(fh, request, arg...) ({ \
int __rc; \
struct timespec __start, __end; \
\
clock_gettime(CLOCK_MONOTONIC, &__start); \
do { \
__rc = ioctl(fh, request, ##arg); \
if (__rc != -1) \
break; \
if ((errno != EINTR) && (errno != EAGAIN)) \
break; \
clock_gettime(CLOCK_MONOTONIC, &__end); \
if (__end.tv_sec * 10 + __end.tv_nsec / 100000000 > \
__start.tv_sec * 10 + __start.tv_nsec / 100000000 + \
MAX_TIME) \
break; \
} while (1); \
\
__rc; \
})
int dvb_dmx_open(int adapter, int demux)
{
int fd_demux;
struct dvb_device *dvb;
struct dvb_dev_list *dvb_dev;
dvb = dvb_dev_alloc();
dvb_dev_find(dvb, NULL, NULL);
dvb_dev = dvb_dev_seek_by_adapter(dvb, adapter, demux, DVB_DEVICE_DEMUX);
if (!dvb_dev) {
dvb_dev_free(dvb);
return -1;
}
fd_demux = open(dvb_dev->path, O_RDWR | O_NONBLOCK);
dvb_dev_free(dvb);
return fd_demux;
}
void dvb_dmx_close(int dmx_fd)
{
(void)xioctl(dmx_fd, DMX_STOP);
close(dmx_fd);
}
void dvb_dmx_stop(int dmx_fd)
{
(void)xioctl(dmx_fd, DMX_STOP);
}
int dvb_set_pesfilter(int dmxfd, int pid, dmx_pes_type_t type,
dmx_output_t output, int buffersize)
{
struct dmx_pes_filter_params pesfilter;
if (buffersize) {
if (xioctl(dmxfd, DMX_SET_BUFFER_SIZE, buffersize) == -1)
perror("DMX_SET_BUFFER_SIZE failed");
}
memset(&pesfilter, 0, sizeof(pesfilter));
pesfilter.pid = pid;
pesfilter.input = DMX_IN_FRONTEND;
pesfilter.output = output;
pesfilter.pes_type = type;
pesfilter.flags = DMX_IMMEDIATE_START;
if (xioctl(dmxfd, DMX_SET_PES_FILTER, &pesfilter) == -1) {
fprintf(stderr, "DMX_SET_PES_FILTER failed "
"(PID = 0x%04x): %d %m\n", pid, errno);
return -1;
}
return 0;
}
int dvb_set_section_filter(int dmxfd, int pid, unsigned filtsize,
unsigned char *filter,
unsigned char *mask,
unsigned char *mode,
unsigned int flags)
{
struct dmx_sct_filter_params sctfilter;
if (filtsize > DMX_FILTER_SIZE)
filtsize = DMX_FILTER_SIZE;
memset(&sctfilter, 0, sizeof(sctfilter));
sctfilter.pid = pid;
if (filter)
memcpy(sctfilter.filter.filter, filter, filtsize);
if (mask)
memcpy(sctfilter.filter.mask, mask, filtsize);
if (mode)
memcpy(sctfilter.filter.mode, mode, filtsize);
sctfilter.flags = flags;
if (xioctl(dmxfd, DMX_SET_FILTER, &sctfilter) == -1) {
fprintf(stderr, "DMX_SET_FILTER failed (PID = 0x%04x): %d %m\n",
pid, errno);
return -1;
}
return 0;
}
int dvb_get_pmt_pid(int patfd, int sid)
{
int count;
int pmt_pid = 0;
int patread = 0;
int section_length;
unsigned char buft[4096];
unsigned char *buf = buft;
struct dmx_sct_filter_params f;
memset(&f, 0, sizeof(f));
f.pid = 0;
f.filter.filter[0] = 0x00;
f.filter.mask[0] = 0xff;
f.timeout = 0;
f.flags = DMX_IMMEDIATE_START | DMX_CHECK_CRC;
if (xioctl(patfd, DMX_SET_FILTER, &f) == -1) {
perror("ioctl DMX_SET_FILTER failed");
return -1;
}
while (!patread){
if (((count = read(patfd, buf, sizeof(buft))) < 0) && errno == EOVERFLOW)
count = read(patfd, buf, sizeof(buft));
if (count < 0) {
perror("read_sections: read error");
return -1;
}
section_length = ((buf[1] & 0x0f) << 8) | buf[2];
if (count != section_length + 3)
continue;
buf += 8;
section_length -= 8;
patread = 1; /* assumes one section contains the whole pat */
while (section_length > 0) {
int service_id = (buf[0] << 8) | buf[1];
if (service_id == sid) {
pmt_pid = ((buf[2] & 0x1f) << 8) | buf[3];
section_length = 0;
}
buf += 4;
section_length -= 4;
}
}
return pmt_pid;
}
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