/* en50221 encoder An implementation for libdvb an implementation for the en50221 transport layer Copyright (C) 2004, 2005 Manu Abraham Copyright (C) 2005 Julian Scheel (julian at jusst dot de) Copyright (C) 2006 Andrew de Quincey (adq_dvb@lidskialf.net) This library 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include #include #include #include "en50221_app_teletext.h" #include "en50221_app_tags.h" #include "asn_1.h" struct en50221_app_teletext { struct en50221_app_send_functions *funcs; en50221_app_teletext_callback callback; void *callback_arg; pthread_mutex_t lock; }; static int en50221_app_teletext_parse_ebu(struct en50221_app_teletext *teletext, uint8_t slot_id, uint16_t session_number, uint8_t * data, uint32_t data_length); struct en50221_app_teletext * en50221_app_teletext_create(struct en50221_app_send_functions *funcs) { struct en50221_app_teletext *teletext = NULL; // create structure and set it up teletext = malloc(sizeof(struct en50221_app_teletext)); if (teletext == NULL) { return NULL; } teletext->funcs = funcs; teletext->callback = NULL; pthread_mutex_init(&teletext->lock, NULL); // done return teletext; } void en50221_app_teletext_destroy(struct en50221_app_teletext *teletext) { pthread_mutex_destroy(&teletext->lock); free(teletext); } void en50221_app_teletext_register_callback(struct en50221_app_teletext *teletext, en50221_app_teletext_callback callback, void *arg) { pthread_mutex_lock(&teletext->lock); teletext->callback = callback; teletext->callback_arg = arg; pthread_mutex_unlock(&teletext->lock); } int en50221_app_teletext_message(struct en50221_app_teletext *teletext, uint8_t slot_id, uint16_t session_number, uint32_t resource_id, uint8_t * data, uint32_t data_length) { (void) resource_id; // get the tag if (data_length < 3) { print(LOG_LEVEL, ERROR, 1, "Received short data\n"); return -1; } uint32_t tag = (data[0] << 16) | (data[1] << 8) | data[2]; switch (tag) { case TAG_TELETEXT_EBU: return en50221_app_teletext_parse_ebu(teletext, slot_id, session_number, data + 3, data_length - 3); } print(LOG_LEVEL, ERROR, 1, "Received unexpected tag %x\n", tag); return -1; } static int en50221_app_teletext_parse_ebu(struct en50221_app_teletext *teletext, uint8_t slot_id, uint16_t session_number, uint8_t *data, uint32_t data_length) { // first of all, decode the length field uint16_t asn_data_length; int length_field_len; if ((length_field_len = asn_1_decode(&asn_data_length, data, data_length)) < 0) { print(LOG_LEVEL, ERROR, 1, "ASN.1 decode error\n"); return -1; } // check it if (asn_data_length > (data_length - length_field_len)) { print(LOG_LEVEL, ERROR, 1, "Received short data\n"); return -1; } uint8_t *teletext_data = data + length_field_len; // tell the app pthread_mutex_lock(&teletext->lock); en50221_app_teletext_callback cb = teletext->callback; void *cb_arg = teletext->callback_arg; pthread_mutex_unlock(&teletext->lock); if (cb) { return cb(cb_arg, slot_id, session_number, teletext_data, asn_data_length); } return 0; } 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61

# Sweden - Ängelholm/Vegeholm
[CHANNEL]
	DELIVERY_SYSTEM = DVBT
	FREQUENCY = 482000000
	BANDWIDTH_HZ = 8000000
	CODE_RATE_HP = 3/4
	CODE_RATE_LP = NONE
	MODULATION = QAM/64
	TRANSMISSION_MODE = 8K
	GUARD_INTERVAL = 1/4
	HIERARCHY = NONE
	INVERSION = AUTO

[CHANNEL]
	DELIVERY_SYSTEM = DVBT
	FREQUENCY = 506000000
	BANDWIDTH_HZ = 8000000
	CODE_RATE_HP = 3/4
	CODE_RATE_LP = NONE
	MODULATION = QAM/64
	TRANSMISSION_MODE = 8K
	GUARD_INTERVAL = 1/4
	HIERARCHY = NONE
	INVERSION = AUTO

[CHANNEL]
	DELIVERY_SYSTEM = DVBT
	FREQUENCY = 634000000
	BANDWIDTH_HZ = 8000000
	CODE_RATE_HP = 3/4
	CODE_RATE_LP = NONE
	MODULATION = QAM/64
	TRANSMISSION_MODE = 8K
	GUARD_INTERVAL = 1/4
	HIERARCHY = NONE
	INVERSION = AUTO

[CHANNEL]
	DELIVERY_SYSTEM = DVBT
	FREQUENCY = 818000000
	BANDWIDTH_HZ = 8000000
	CODE_RATE_HP = 3/4
	CODE_RATE_LP = NONE
	MODULATION = QAM/64
	TRANSMISSION_MODE = 8K
	GUARD_INTERVAL = 1/4
	HIERARCHY = NONE
	INVERSION = AUTO

[CHANNEL]
	DELIVERY_SYSTEM = DVBT
	FREQUENCY = 794000000
	BANDWIDTH_HZ = 8000000
	CODE_RATE_HP = 3/4
	CODE_RATE_LP = NONE
	MODULATION = QAM/64
	TRANSMISSION_MODE = 8K
	GUARD_INTERVAL = 1/4
	HIERARCHY = NONE
	INVERSION = AUTO