Imported Upstream version 1.1.1+rev1207upstream/1.1.1+rev1207

6 files changed, 687 insertions, 0 deletions

diff --git a/util/dvbscan/Makefile b/util/dvbscan/Makefile
new file mode 100644
index 0000000..d7e5de5
--- /dev/null
+++ b/util/dvbscan/Makefile
@@ -0,0 +1,22 @@
+# Makefile for linuxtv.org dvb-apps/util/dvbscan
+
+objects  = dvbscan.o  \
+	   dvbscan_structutils.o \
+           dvbscan_dvb.o \
+           dvbscan_atsc.o
+
+binaries = dvbscan
+
+inst_bin = $(binaries)
+
+CPPFLAGS += -I../../lib
+LDFLAGS  += -L../../lib/libdvbapi -L../../lib/libdvbcfg -L../../lib/libdvbsec -L../../lib/libucsi
+LDLIBS   += -ldvbcfg -lucsi -ldvbsec -ldvbapi -lpthread
+
+.PHONY: all
+
+all: $(binaries)
+
+$(binaries): $(objects)
+
+include ../../Make.rules
diff --git a/util/dvbscan/dvbscan.c b/util/dvbscan/dvbscan.c
new file mode 100644
index 0000000..c6f9ea8
--- /dev/null
+++ b/util/dvbscan/dvbscan.c
@@ -0,0 +1,370 @@
+/*
+	dvbscan utility
+
+	Copyright (C) 2006 Andrew de Quincey (adq_dvb@lidskialf.net)
+
+	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 <stdlib.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <string.h>
+#include <time.h>
+#include <libdvbsec/dvbsec_cfg.h>
+#include <libdvbcfg/dvbcfg_scanfile.h>
+#include <libdvbapi/dvbdemux.h>
+#include "dvbscan.h"
+
+
+#define OUTPUT_TYPE_RAW 		1
+#define OUTPUT_TYPE_CHANNELS 		2
+#define OUTPUT_TYPE_VDR12 		3
+#define OUTPUT_TYPE_VDR13 		4
+
+#define SERVICE_FILTER_TV		1
+#define SERVICE_FILTER_RADIO		2
+#define SERVICE_FILTER_OTHER		4
+#define SERVICE_FILTER_ENCRYPTED	8
+
+#define TIMEOUT_WAIT_LOCK		2
+
+
+// transponders we have yet to scan
+static struct transponder *toscan = NULL;
+static struct transponder *toscan_end = NULL;
+
+// transponders we have scanned
+static struct transponder *scanned = NULL;
+static struct transponder *scanned_end = NULL;
+
+
+static void usage(void)
+{
+	static const char *_usage = "\n"
+		" dvbscan: A digital tv channel scanning utility\n"
+		" Copyright (C) 2006 Andrew de Quincey (adq_dvb@lidskialf.net)\n\n"
+		" usage: dvbscan <options> as follows:\n"
+		" -h			help\n"
+		" -adapter <id>		adapter to use (default 0)\n"
+		" -frontend <id>	frontend to use (default 0)\n"
+		" -demux <id>		demux to use (default 0)\n"
+		" -secfile <filename>	Optional sec.conf file.\n"
+		" -secid <secid>	ID of the SEC configuration to use, one of:\n"
+		"			 * UNIVERSAL (default) - Europe, 10800 to 11800 MHz and 11600 to 12700 Mhz,\n"
+		" 						 Dual LO, loband 9750, hiband 10600 MHz.\n"
+		"			 * DBS - Expressvu, North America, 12200 to 12700 MHz, Single LO, 11250 MHz.\n"
+		"			 * STANDARD - 10945 to 11450 Mhz, Single LO, 10000 Mhz.\n"
+		"			 * ENHANCED - Astra, 10700 to 11700 MHz, Single LO, 9750 MHz.\n"
+		"			 * C-BAND - Big Dish, 3700 to 4200 MHz, Single LO, 5150 Mhz.\n"
+		"			 * C-MULTI - Big Dish - Multipoint LNBf, 3700 to 4200 MHz,\n"
+		"						Dual LO, H:5150MHz, V:5750MHz.\n"
+		"			 * One of the sec definitions from the secfile if supplied\n"
+		" -satpos <position>	Specify DISEQC switch position for DVB-S.\n"
+		" -inversion <on|off|auto> Specify inversion (default: auto).\n"
+		" -uk-ordering 		Use UK DVB-T channel ordering if present.\n"
+		" -timeout <secs>	Specify filter timeout to use (standard specced values will be used by default)\n"
+		" -filter <filter>	Specify service filter, a comma seperated list of the following tokens:\n"
+		" 			 (If no filter is supplied, all services will be output)\n"
+		"			 * tv - Output TV channels\n"
+		"			 * radio - Output radio channels\n"
+		"			 * other - Output other channels\n"
+		"			 * encrypted - Output encrypted channels\n"
+		" -out raw <filename>|-	 Output in raw format to <filename> or stdout\n"
+		"      channels <filename>|-  Output in channels.conf format to <filename> or stdout.\n"
+		"      vdr12 <filename>|- Output in vdr 1.2.x format to <filename> or stdout.\n"
+		"      vdr13 <filename>|- Output in vdr 1.3.x format to <filename> or stdout.\n"
+		" <initial scan file>\n";
+	fprintf(stderr, "%s\n", _usage);
+
+	exit(1);
+}
+
+
+static int scan_load_callback(struct dvbcfg_scanfile *channel, void *private_data)
+{
+	struct dvbfe_info *feinfo = (struct dvbfe_info *) private_data;
+
+	if (channel->fe_type != feinfo->type)
+		return 0;
+
+	struct transponder *t = new_transponder();
+	append_transponder(t, &toscan, &toscan_end);
+	memcpy(&t->params, &channel->fe_params, sizeof(struct dvbfe_parameters));
+
+	add_frequency(t, t->params.frequency);
+	t->params.frequency = 0;
+
+	return 0;
+}
+
+int main(int argc, char *argv[])
+{
+	uint32_t i;
+	int argpos = 1;
+	int adapter_id = 0;
+	int frontend_id = 0;
+	int demux_id = 0;
+	char *secfile = NULL;
+	char *secid = NULL;
+	int satpos = 0;
+	enum dvbfe_spectral_inversion inversion = DVBFE_INVERSION_AUTO;
+	int service_filter = -1;
+	int uk_ordering = 0;
+	int timeout = 5;
+	int output_type = OUTPUT_TYPE_RAW;
+	char *output_filename = NULL;
+	char *scan_filename = NULL;
+	struct dvbsec_config sec;
+	int valid_sec = 0;
+
+	while(argpos != argc) {
+		if (!strcmp(argv[argpos], "-h")) {
+			usage();
+		} else if (!strcmp(argv[argpos], "-adapter")) {
+			if ((argc - argpos) < 2)
+				usage();
+			if (sscanf(argv[argpos+1], "%i", &adapter_id) != 1)
+				usage();
+			argpos+=2;
+		} else if (!strcmp(argv[argpos], "-frontend")) {
+			if ((argc - argpos) < 2)
+				usage();
+			if (sscanf(argv[argpos+1], "%i", &frontend_id) != 1)
+				usage();
+			argpos+=2;
+		} else if (!strcmp(argv[argpos], "-demux")) {
+			if ((argc - argpos) < 2)
+				usage();
+			if (sscanf(argv[argpos+1], "%i", &demux_id) != 1)
+				usage();
+			argpos+=2;
+		} else if (!strcmp(argv[argpos], "-secfile")) {
+			if ((argc - argpos) < 2)
+				usage();
+			secfile = argv[argpos+1];
+			argpos+=2;
+		} else if (!strcmp(argv[argpos], "-secid")) {
+			if ((argc - argpos) < 2)
+				usage();
+			secid = argv[argpos+1];
+			argpos+=2;
+		} else if (!strcmp(argv[argpos], "-satpos")) {
+			if ((argc - argpos) < 2)
+				usage();
+			if (sscanf(argv[argpos+1], "%i", &satpos) != 1)
+				usage();
+			argpos+=2;
+		} else if (!strcmp(argv[argpos], "-inversion")) {
+			if ((argc - argpos) < 2)
+				usage();
+			if (!strcmp(argv[argpos+1], "off")) {
+				inversion = DVBFE_INVERSION_OFF;
+			} else if (!strcmp(argv[argpos+1], "on")) {
+				inversion = DVBFE_INVERSION_ON;
+			} else if (!strcmp(argv[argpos+1], "auto")) {
+				inversion = DVBFE_INVERSION_AUTO;
+			} else {
+				usage();
+			}
+			argpos+=2;
+		} else if (!strcmp(argv[argpos], "-uk-ordering")) {
+			if ((argc - argpos) < 1)
+				usage();
+			uk_ordering = 1;
+		} else if (!strcmp(argv[argpos], "-timeout")) {
+			if ((argc - argpos) < 2)
+				usage();
+			if (sscanf(argv[argpos+1], "%i", &timeout) != 1)
+				usage();
+			argpos+=2;
+		} else if (!strcmp(argv[argpos], "-filter")) {
+			if ((argc - argpos) < 2)
+				usage();
+			service_filter = 0;
+			if (!strstr(argv[argpos+1], "tv")) {
+				service_filter |= SERVICE_FILTER_TV;
+			}
+ 			if (!strstr(argv[argpos+1], "radio")) {
+				service_filter |= SERVICE_FILTER_RADIO;
+ 			}
+			if (!strstr(argv[argpos+1], "other")) {
+				service_filter |= SERVICE_FILTER_OTHER;
+			}
+			if (!strstr(argv[argpos+1], "encrypted")) {
+				service_filter |= SERVICE_FILTER_ENCRYPTED;
+			}
+			argpos+=2;
+		} else if (!strcmp(argv[argpos], "-out")) {
+			if ((argc - argpos) < 3)
+				usage();
+			if (!strcmp(argv[argpos+1], "raw")) {
+				output_type = OUTPUT_TYPE_RAW;
+			} else if (!strcmp(argv[argpos+1], "channels")) {
+				output_type = OUTPUT_TYPE_CHANNELS;
+			} else if (!strcmp(argv[argpos+1], "vdr12")) {
+				output_type = OUTPUT_TYPE_VDR12;
+			} else if (!strcmp(argv[argpos+1], "vdr13")) {
+				output_type = OUTPUT_TYPE_VDR13;
+			} else {
+				usage();
+			}
+			output_filename = argv[argpos+2];
+			if (!strcmp(output_filename, "-"))
+				output_filename = NULL;
+		} else {
+			if ((argc - argpos) != 1)
+				usage();
+			scan_filename = argv[argpos];
+			argpos++;
+		}
+	}
+
+	// open the frontend & get its type
+	struct dvbfe_handle *fe = dvbfe_open(adapter_id, frontend_id, 0);
+	if (fe == NULL) {
+		fprintf(stderr, "Failed to open frontend\n");
+		exit(1);
+	}
+	struct dvbfe_info feinfo;
+	if (dvbfe_get_info(fe, 0, &feinfo, DVBFE_INFO_QUERYTYPE_IMMEDIATE, 0) != 0) {
+		fprintf(stderr, "Failed to query frontend\n");
+		exit(1);
+	}
+
+	// default SEC with a DVBS card
+	if ((secid == NULL) && (feinfo.type == DVBFE_TYPE_DVBS))
+		secid = "UNIVERSAL";
+
+	// look up SECID if one was supplied
+	if (secid != NULL) {
+		if (dvbsec_cfg_find(secfile, secid, &sec)) {
+			fprintf(stderr, "Unable to find suitable sec/lnb configuration for channel\n");
+			exit(1);
+		}
+		valid_sec = 1;
+	}
+
+	// load the initial scan file
+	FILE *scan_file = fopen(scan_filename, "r");
+	if (scan_file == NULL) {
+		fprintf(stderr, "Could not open scan file %s\n", scan_filename);
+		exit(1);
+	}
+	if (dvbcfg_scanfile_parse(scan_file, scan_load_callback, &feinfo) < 0) {
+		fprintf(stderr, "Could not parse scan file %s\n", scan_filename);
+		exit(1);
+	}
+	fclose(scan_file);
+
+	// main scan loop
+	while(toscan) {
+		// get the first item on the toscan list
+		struct transponder *tmp = first_transponder(&toscan, &toscan_end);
+
+		// have we already seen this transponder?
+		if (seen_transponder(tmp, scanned)) {
+			free_transponder(tmp);
+			continue;
+		}
+
+		// do we have a valid SEC configuration?
+		struct dvbsec_config *psec = NULL;
+		if (valid_sec)
+			psec = &sec;
+
+		// tune it
+		int tuned_ok = 0;
+		for(i=0; i < tmp->frequency_count; i++) {
+			tmp->params.frequency = tmp->frequencies[i];
+			if (dvbsec_set(fe,
+					psec,
+					tmp->polarization,
+					(satpos & 0x01) ? DISEQC_SWITCH_B : DISEQC_SWITCH_A,
+					(satpos & 0x02) ? DISEQC_SWITCH_B : DISEQC_SWITCH_A,
+					&tmp->params,
+					0)) {
+				fprintf(stderr, "Failed to set frontend\n");
+				exit(1);
+			}
+
+			// wait for lock
+			time_t starttime = time(NULL);
+			while((time(NULL) - starttime) < TIMEOUT_WAIT_LOCK) {
+				if (dvbfe_get_info(fe, DVBFE_INFO_LOCKSTATUS, &feinfo,
+				    			DVBFE_INFO_QUERYTYPE_IMMEDIATE, 0) !=
+					DVBFE_INFO_QUERYTYPE_IMMEDIATE) {
+					fprintf(stderr, "Unable to query frontend status\n");
+					exit(1);
+				}
+				if (feinfo.lock) {
+					tuned_ok = 1;
+					break;
+				}
+				usleep(100000);
+			}
+		}
+		if (!tuned_ok) {
+			free_transponder(tmp);
+			continue;
+		}
+
+		// scan it
+		switch(feinfo.type) {
+		case DVBFE_TYPE_DVBS:
+		case DVBFE_TYPE_DVBC:
+		case DVBFE_TYPE_DVBT:
+			dvbscan_scan_dvb(fe);
+			break;
+
+		case DVBFE_TYPE_ATSC:
+			dvbscan_scan_atsc(fe);
+			break;
+		}
+
+		// add to scanned list.
+		append_transponder(tmp, &scanned, &scanned_end);
+	}
+
+	// FIXME: output the data
+
+	return 0;
+}
+
+int create_section_filter(int adapter, int demux, uint16_t pid, uint8_t table_id)
+{
+	int demux_fd = -1;
+	uint8_t filter[18];
+	uint8_t mask[18];
+
+	// open the demuxer
+	if ((demux_fd = dvbdemux_open_demux(adapter, demux, 0)) < 0) {
+		return -1;
+	}
+
+	// create a section filter
+	memset(filter, 0, sizeof(filter));
+	memset(mask, 0, sizeof(mask));
+	filter[0] = table_id;
+	mask[0] = 0xFF;
+	if (dvbdemux_set_section_filter(demux_fd, pid, filter, mask, 1, 1)) {
+		close(demux_fd);
+		return -1;
+	}
+
+	// done
+	return demux_fd;
+}
diff --git a/util/dvbscan/dvbscan.h b/util/dvbscan/dvbscan.h
new file mode 100644
index 0000000..ddf61cf
--- /dev/null
+++ b/util/dvbscan/dvbscan.h
@@ -0,0 +1,136 @@
+/*
+	dvbscan utility
+
+	Copyright (C) 2006 Andrew de Quincey (adq_dvb@lidskialf.net)
+
+	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.
+*/
+
+#ifndef DVBSCAN_H
+#define DVBSCAN_H 1
+
+#include <libdvbapi/dvbfe.h>
+#include <libdvbsec/dvbsec_api.h>
+#include <libucsi/types.h>
+
+/**
+ * A stream which is part of a service.
+ */
+struct stream
+{
+	uint8_t stream_type;
+	iso639lang_t language;
+
+	struct stream *next;
+};
+
+/**
+ * A service (programme) which is part of a transponder.
+ */
+struct service
+{
+	/**
+	 * Service identification stuff. Strings are in UTF-8.
+	 */
+	uint16_t service_id;
+	char *provider_name;
+	char *service_name;
+
+	/**
+	 * Pids common to the whole service.
+	 */
+	uint16_t pmt_pid;
+	uint16_t pcr_pid;
+
+	/**
+	 * CA stuff.
+	 */
+	uint16_t *ca_ids;
+	uint32_t ca_ids_count;
+	uint8_t is_scrambled;
+
+	/**
+	 * BBC channel number (-1 if unknown).
+	 */
+	int bbc_channel_number;
+
+	/**
+	 * Streams composing this service.
+	 */
+	struct stream *streams;
+	struct stream *streams_end;
+
+	/**
+	 * Next service in list.
+	 */
+	struct service *next;
+};
+
+/**
+ * A collection of multiplexed services.
+ */
+struct transponder
+{
+	/**
+	 * we need to have a seperate list of frequencies since the
+	 * DVB standard allows a frequency list descriptor of alternate
+	 * frequencies to be supplied.
+	 */
+	uint32_t *frequencies;
+	uint32_t frequency_count;
+
+	/**
+	 * The rest of the tuning parameters.
+	 */
+	struct dvbfe_parameters params;
+
+	/**
+	 * DVBS specific parameters
+	 */
+	enum dvbsec_diseqc_polarization polarization;
+	int oribital_position;
+
+	/**
+	 * Numerical IDs
+	 */
+	uint16_t network_id;
+	uint16_t original_network_id;
+	uint16_t transport_stream_id;
+
+	/**
+	 * Services detected on this transponder.
+	 */
+	struct service *services;
+	struct service *services_end;
+
+	/**
+	 * Next item in list.
+	 */
+	struct transponder *next;
+};
+
+extern void append_transponder(struct transponder *t, struct transponder **tlist, struct transponder **tlist_end);
+extern struct transponder *new_transponder(void);
+extern void free_transponder(struct transponder *t);
+extern int seen_transponder(struct transponder *t, struct transponder *checklist);
+extern void add_frequency(struct transponder *t, uint32_t frequency);
+extern struct transponder *first_transponder(struct transponder **tlist, struct transponder **tlist_end);
+
+extern int create_section_filter(int adapter, int demux, uint16_t pid, uint8_t table_id);
+extern void dvbscan_scan_dvb(struct dvbfe_handle *fe);
+extern void dvbscan_scan_atsc(struct dvbfe_handle *fe);
+
+#endif
diff --git a/util/dvbscan/dvbscan_atsc.c b/util/dvbscan/dvbscan_atsc.c
new file mode 100644
index 0000000..b346f78
--- /dev/null
+++ b/util/dvbscan/dvbscan_atsc.c
@@ -0,0 +1,30 @@
+/*
+	dvbscan utility
+
+	Copyright (C) 2006 Andrew de Quincey (adq_dvb@lidskialf.net)
+
+	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 <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include "dvbscan.h"
+
+void dvbscan_scan_atsc(struct dvbfe_handle *fe)
+{
+	// FIXME
+}
diff --git a/util/dvbscan/dvbscan_dvb.c b/util/dvbscan/dvbscan_dvb.c
new file mode 100644
index 0000000..c76d072
--- /dev/null
+++ b/util/dvbscan/dvbscan_dvb.c
@@ -0,0 +1,30 @@
+/*
+	dvbscan utility
+
+	Copyright (C) 2006 Andrew de Quincey (adq_dvb@lidskialf.net)
+
+	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 <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include "dvbscan.h"
+
+void dvbscan_scan_dvb(struct dvbfe_handle *fe)
+{
+	// FIXME
+}
diff --git a/util/dvbscan/dvbscan_structutils.c b/util/dvbscan/dvbscan_structutils.c
new file mode 100644
index 0000000..6fe3124
--- /dev/null
+++ b/util/dvbscan/dvbscan_structutils.c
@@ -0,0 +1,99 @@
+/*
+	dvbscan utility
+
+	Copyright (C) 2006 Andrew de Quincey (adq_dvb@lidskialf.net)
+
+	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 <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include "dvbscan.h"
+
+void append_transponder(struct transponder *t, struct transponder **tlist, struct transponder **tlist_end)
+{
+	if (*tlist_end == NULL) {
+		*tlist = t;
+	} else {
+		(*tlist_end)->next = t;
+	}
+	*tlist_end = t;
+	t->next = NULL;
+}
+
+struct transponder *new_transponder(void)
+{
+	struct transponder *t = (struct transponder *) malloc(sizeof(struct transponder));
+	if (t == NULL) {
+		fprintf(stderr, "Out of memory\n");
+		exit(1);
+	}
+	memset(t, 0, sizeof(struct transponder));
+
+	return t;
+}
+
+void free_transponder(struct transponder *t)
+{
+	if (t->frequencies)
+		free(t->frequencies);
+	// FIXME: free services
+	free(t);
+}
+
+int seen_transponder(struct transponder *t, struct transponder *checklist)
+{
+	uint32_t i;
+
+	struct transponder *cur_check = checklist;
+	while(cur_check) {
+		uint32_t freq1 = cur_check->params.frequency / 2000;
+		for(i=0; i < t->frequency_count; i++) {
+			uint32_t freq2 = t->frequencies[i] / 2000;
+			if (freq1 == freq2) {
+				return 1;
+			}
+		}
+		cur_check = cur_check->next;
+	}
+
+	return 0;
+}
+
+void add_frequency(struct transponder *t, uint32_t frequency)
+{
+	uint32_t *tmp;
+
+	tmp = (uint32_t*) realloc(t->frequencies, sizeof(uint32_t) * (t->frequency_count + 1));
+	if (tmp == NULL) {
+		fprintf(stderr, "Out of memory\n");
+		exit(1);
+	}
+	tmp[t->frequency_count++] = frequency;
+	t->frequencies = tmp;
+}
+
+struct transponder *first_transponder(struct transponder **tlist, struct transponder **tlist_end)
+{
+	struct transponder *t = *tlist;
+
+	*tlist = t->next;
+	if (*tlist == NULL)
+		*tlist_end = NULL;
+
+	return t;
+}