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/* test_tapdmx.c - Test recording a TS from the dmx device.
* very similar to test_dvr but using the new DMX_OUT_TSDEMUX_TAP
* usage: test_tapdmx PID [more PIDs...]
*
* test_dvr is
* Copyright (C) 2003 convergence GmbH
* Johannes Stezenbach <js@convergence.de>
* test_tapdmx conversion is
* Copyright (C) 2011 B1 Systems GmbH
* Stefan Seyfried <seife+dvb@b1-systems.com>
*
* 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; either version 2.1
* 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 Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
*/
//hm, I haven't tested writing large files yet... maybe it works
#define _LARGEFILE64_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <errno.h>
#include <inttypes.h>
#include <linux/dvb/dmx.h>
static unsigned long BUF_SIZE = 64 * 1024;
static unsigned long long total_bytes;
static void usage(void)
{
fprintf(stderr, "usage: test_tapdmx file PID [more PIDs...]\n"
" record a partial TS stream consisting of TS packets\n"
" with the selected PIDs to the given file.\n"
" Use PID 0x2000 to record the full TS stream (if\n"
" the hardware supports it).\n"
" The demux device used can be changed by setting\n"
" the environment variable DEMUX.\n"
" You can override the input buffer size by setting BUF_SIZE to\n"
" the number of bytes wanted.\n"
" Note: There is no output buffering, so writing to stdout is\n"
" not really supported, but you can try something like:\n"
" BUF_SIZE=188 ./test_tapdmx /dev/stdout 0 2>/dev/null | xxd\n"
" ./test_tapdmx /dev/stdout 0x100 0x110 2>/dev/null| xine stdin://mpeg2\n"
"\n");
exit(1);
}
static void process_data(int dvrfd, int tsfd)
{
uint8_t buf[BUF_SIZE];
int bytes, b2;
bytes = read(dvrfd, buf, sizeof(buf));
if (bytes < 0) {
perror("read");
if (errno == EOVERFLOW)
return;
fprintf(stderr, "exiting due to read() error\n");
exit(1);
}
total_bytes += bytes;
b2 = write(tsfd, buf, bytes);
if (b2 == -1) {
perror("write");
exit(1);
} else if (b2 < bytes)
fprintf(stderr, "warning: read %d, but wrote only %d bytes\n", bytes, b2);
else
fprintf(stderr, "got %d bytes (%llu total)\n", bytes, total_bytes);
}
int main(int argc, char *argv[])
{
int dmxfd, tsfd;
unsigned int pid;
struct dmx_pes_filter_params f;
char *dmxdev = "/dev/dvb/adapter0/demux0";
int i;
char *chkp;
if (argc < 3)
usage();
if (getenv("DEMUX"))
dmxdev = getenv("DEMUX");
fprintf(stderr, "using '%s'\n"
"writing to '%s'\n", dmxdev, argv[1]);
tsfd = open(argv[1], O_WRONLY | O_CREAT | O_TRUNC | O_LARGEFILE, 0664);
if (tsfd == -1) {
perror("cannot write output file");
return 1;
}
dmxfd = open(dmxdev, O_RDONLY);
if (dmxfd == -1) {
perror("cannot open dmx device");
return 1;
}
if (getenv("BUF_SIZE") && ((BUF_SIZE = strtoul(getenv("BUF_SIZE"), NULL, 0)) > 0))
fprintf(stderr, "BUF_SIZE = %lu\n", BUF_SIZE);
pid = strtoul(argv[2], &chkp, 0);
if (pid > 0x2000 || chkp == argv[2])
usage();
fprintf(stderr, "adding filter for PID 0x%04x\n", pid);
memset(&f, 0, sizeof(f));
f.pid = (uint16_t) pid;
f.input = DMX_IN_FRONTEND;
f.output = DMX_OUT_TSDEMUX_TAP;
f.pes_type = DMX_PES_OTHER;
if (ioctl(dmxfd, DMX_SET_PES_FILTER, &f) == -1) {
perror("DMX_SET_PES_FILTER");
return 1;
}
for (i = 3; i < argc; i++) {
pid = strtoul(argv[i], &chkp, 0);
if (pid > 0x2000 || chkp == argv[i])
usage();
fprintf(stderr, "adding filter for PID 0x%04x\n", pid);
if (ioctl(dmxfd, DMX_ADD_PID, &pid) == -1) {
perror("DMX_ADD_PID");
return 1;
}
}
if (ioctl(dmxfd, DMX_START) == -1) {
perror("DMX_START");
close(dmxfd);
return 1;
}
for (;;) {
process_data(dmxfd, tsfd);
}
close(dmxfd);
return 0;
}
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