diff options
Diffstat (limited to 'lib/libdvben50221/en50221_app_ai.c')
| -rw-r--r-- | lib/libdvben50221/en50221_app_ai.c | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/lib/libdvben50221/en50221_app_ai.c b/lib/libdvben50221/en50221_app_ai.c new file mode 100644 index 0000000..b7ded66 --- /dev/null +++ b/lib/libdvben50221/en50221_app_ai.c @@ -0,0 +1,191 @@ +/* + en50221 encoder An implementation for libdvb + an implementation for the en50221 transport layer + + Copyright (C) 2004, 2005 Manu Abraham <abraham.manu@gmail.com> + 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 <string.h> +#include <libdvbmisc/dvbmisc.h> +#include <pthread.h> +#include "en50221_app_ai.h" +#include "en50221_app_tags.h" +#include "asn_1.h" + +struct en50221_app_ai { + struct en50221_app_send_functions *funcs; + + en50221_app_ai_callback callback; + void *callback_arg; + + pthread_mutex_t lock; +}; + +static int en50221_app_ai_parse_app_info(struct en50221_app_ai *ai, + uint8_t slot_id, + uint16_t session_number, + uint8_t * data, + uint32_t data_length); + + +struct en50221_app_ai *en50221_app_ai_create(struct en50221_app_send_functions *funcs) +{ + struct en50221_app_ai *ai = NULL; + + // create structure and set it up + ai = malloc(sizeof(struct en50221_app_ai)); + if (ai == NULL) { + return NULL; + } + ai->funcs = funcs; + ai->callback = NULL; + + pthread_mutex_init(&ai->lock, NULL); + + // done + return ai; +} + +void en50221_app_ai_destroy(struct en50221_app_ai *ai) +{ + pthread_mutex_destroy(&ai->lock); + free(ai); +} + +void en50221_app_ai_register_callback(struct en50221_app_ai *ai, + en50221_app_ai_callback callback, + void *arg) +{ + pthread_mutex_lock(&ai->lock); + ai->callback = callback; + ai->callback_arg = arg; + pthread_mutex_unlock(&ai->lock); +} + +int en50221_app_ai_enquiry(struct en50221_app_ai *ai, + uint16_t session_number) +{ + uint8_t data[4]; + + data[0] = (TAG_APP_INFO_ENQUIRY >> 16) & 0xFF; + data[1] = (TAG_APP_INFO_ENQUIRY >> 8) & 0xFF; + data[2] = TAG_APP_INFO_ENQUIRY & 0xFF; + data[3] = 0; + + return ai->funcs->send_data(ai->funcs->arg, session_number, data, 4); +} + +int en50221_app_ai_entermenu(struct en50221_app_ai *ai, + uint16_t session_number) +{ + uint8_t data[4]; + + data[0] = (TAG_ENTER_MENU >> 16) & 0xFF; + data[1] = (TAG_ENTER_MENU >> 8) & 0xFF; + data[2] = TAG_ENTER_MENU & 0xFF; + data[3] = 0; + + return ai->funcs->send_data(ai->funcs->arg, session_number, data, 4); +} + +int en50221_app_ai_message(struct en50221_app_ai *ai, + 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_APP_INFO: + return en50221_app_ai_parse_app_info(ai, 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_ai_parse_app_info(struct en50221_app_ai *ai, + uint8_t slot_id, + uint16_t session_number, + uint8_t * data, + uint32_t data_length) +{ + // parse the length field + int length_field_len; + uint16_t asn_data_length; + if ((length_field_len = asn_1_decode(&asn_data_length, data, data_length)) < 0) { + print(LOG_LEVEL, ERROR, 1, + "Received data with invalid length from module on slot %02x\n", + slot_id); + return -1; + } + // check it + if (asn_data_length < 6) { + print(LOG_LEVEL, ERROR, 1, "Received short data\n"); + return -1; + } + if (asn_data_length > (data_length - length_field_len)) { + print(LOG_LEVEL, ERROR, 1, "Received short data\n"); + return -1; + } + uint8_t *app_info = data + length_field_len; + + // parse the fields + uint8_t application_type = app_info[0]; + uint16_t application_manufacturer = (app_info[1] << 8) | app_info[2]; + uint16_t manufacturer_code = (app_info[3] << 8) | app_info[4]; + uint8_t menu_string_length = app_info[5]; + uint8_t *menu_string = app_info + 6; + + // check the menu_string_length + if (menu_string_length > (asn_data_length - 6)) { + print(LOG_LEVEL, ERROR, 1, + "Received bad menu string length - adjusting\n"); + menu_string_length = asn_data_length - 6; + } + // tell the app + pthread_mutex_lock(&ai->lock); + en50221_app_ai_callback cb = ai->callback; + void *cb_arg = ai->callback_arg; + pthread_mutex_unlock(&ai->lock); + if (cb) { + return cb(cb_arg, slot_id, session_number, + application_type, application_manufacturer, + manufacturer_code, menu_string_length, + menu_string); + } + return 0; +} |