From 9fe4d4ea9c054e539ab679ed2e9c076c35beb69d Mon Sep 17 00:00:00 2001 From: etobi Date: Tue, 3 Sep 2013 09:48:45 +0200 Subject: Imported Upstream version 1.1.1+rev1355 --- util/szap/util.c | 126 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 126 insertions(+) create mode 100644 util/szap/util.c (limited to 'util/szap/util.c') diff --git a/util/szap/util.c b/util/szap/util.c new file mode 100644 index 0000000..301d666 --- /dev/null +++ b/util/szap/util.c @@ -0,0 +1,126 @@ +/* + * 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 +#include +#include +#include + +#include +#include +#include +#include + +#include +#include + + +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; +} -- cgit v1.2.3