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/*
* util functions for various ?zap implementations
*
* Copyright (C) 2001 Johannes Stezenbach (js@convergence.de)
* for convergence integrated media
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <linux/dvb/frontend.h>
#include <linux/dvb/dmx.h>
int set_pesfilter(int dmxfd, int pid, int pes_type, int dvr)
{
struct dmx_pes_filter_params pesfilter;
/* ignore this pid to allow radio services */
if (pid < 0 ||
pid >= 0x1fff ||
(pid == 0 && pes_type != DMX_PES_OTHER))
return 0;
if (dvr) {
int buffersize = 64 * 1024;
if (ioctl(dmxfd, DMX_SET_BUFFER_SIZE, buffersize) == -1)
perror("DMX_SET_BUFFER_SIZE failed");
}
pesfilter.pid = pid;
pesfilter.input = DMX_IN_FRONTEND;
pesfilter.output = dvr ? DMX_OUT_TS_TAP : DMX_OUT_DECODER;
pesfilter.pes_type = pes_type;
pesfilter.flags = DMX_IMMEDIATE_START;
if (ioctl(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 get_pmt_pid(char *dmxdev, int sid)
{
int patfd, 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 ((patfd = open(dmxdev, O_RDWR)) < 0) {
perror("openening pat demux failed");
return -1;
}
if (ioctl(patfd, DMX_SET_FILTER, &f) == -1) {
perror("ioctl DMX_SET_FILTER failed");
close(patfd);
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");
close(patfd);
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;
}
}
close(patfd);
return pmt_pid;
}
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