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186 lines
5.9 KiB
186 lines
5.9 KiB
/*
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en50221 encoder An implementation for libdvb
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an implementation for the en50221 transport layer
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Copyright (C) 2004, 2005 Manu Abraham (manu@kromtek.com)
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Copyright (C) 2005 Julian Scheel (julian at jusst dot de)
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Copyright (C) 2006 Andrew de Quincey (adq_dvb@lidskialf.net)
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This library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of
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the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <string.h>
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#include <libdvbmisc/dvbmisc.h>
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#include <pthread.h>
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#include "en50221_app_ai.h"
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#include "en50221_app_tags.h"
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#include "asn_1.h"
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struct en50221_app_ai_private {
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struct en50221_app_send_functions *funcs;
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en50221_app_ai_callback callback;
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void *callback_arg;
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pthread_mutex_t lock;
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};
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static int en50221_app_ai_parse_app_info(struct en50221_app_ai_private *private,
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uint8_t slot_id, uint16_t session_number,
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uint8_t *data, uint32_t data_length);
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en50221_app_ai en50221_app_ai_create(struct en50221_app_send_functions *funcs)
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{
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struct en50221_app_ai_private *private = NULL;
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// create structure and set it up
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private = malloc(sizeof(struct en50221_app_ai_private));
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if (private == NULL) {
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return NULL;
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}
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private->funcs = funcs;
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private->callback = NULL;
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pthread_mutex_init(&private->lock, NULL);
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// done
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return private;
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}
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void en50221_app_ai_destroy(en50221_app_ai ai)
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{
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struct en50221_app_ai_private *private = (struct en50221_app_ai_private *) ai;
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pthread_mutex_destroy(&private->lock);
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free(private);
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}
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void en50221_app_ai_register_callback(en50221_app_ai ai, en50221_app_ai_callback callback, void *arg)
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{
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struct en50221_app_ai_private *private = (struct en50221_app_ai_private *) ai;
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pthread_mutex_lock(&private->lock);
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private->callback = callback;
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private->callback_arg = arg;
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pthread_mutex_unlock(&private->lock);
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}
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int en50221_app_ai_enquiry(en50221_app_ai ai, uint16_t session_number)
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{
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struct en50221_app_ai_private *private = (struct en50221_app_ai_private *) ai;
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uint8_t data[4];
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data[0] = (TAG_APP_INFO_ENQUIRY >> 16) & 0xFF;
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data[1] = (TAG_APP_INFO_ENQUIRY >> 8) & 0xFF;
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data[2] = TAG_APP_INFO_ENQUIRY & 0xFF;
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data[3] = 0;
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return private->funcs->send_data(private->funcs->arg, session_number, data, 4);
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}
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int en50221_app_ai_entermenu(en50221_app_ai ai, uint16_t session_number)
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{
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struct en50221_app_ai_private *private = (struct en50221_app_ai_private *) ai;
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uint8_t data[4];
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data[0] = (TAG_ENTER_MENU >> 16) & 0xFF;
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data[1] = (TAG_ENTER_MENU >> 8) & 0xFF;
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data[2] = TAG_ENTER_MENU & 0xFF;
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data[3] = 0;
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return private->funcs->send_data(private->funcs->arg, session_number, data, 4);
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}
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int en50221_app_ai_message(en50221_app_ai ai,
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uint8_t slot_id,
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uint16_t session_number,
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uint32_t resource_id,
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uint8_t *data, uint32_t data_length)
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{
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struct en50221_app_ai_private *private = (struct en50221_app_ai_private *) ai;
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(void) resource_id;
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// get the tag
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if (data_length < 3) {
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print(LOG_LEVEL, ERROR, 1, "Received short data\n");
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return -1;
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}
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uint32_t tag = (data[0] << 16) | (data[1] << 8) | data[2];
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switch(tag)
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{
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case TAG_APP_INFO:
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return en50221_app_ai_parse_app_info(private, slot_id, session_number, data+3, data_length-3);
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}
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print(LOG_LEVEL, ERROR, 1, "Received unexpected tag %x\n", tag);
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return -1;
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}
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static int en50221_app_ai_parse_app_info(struct en50221_app_ai_private *private,
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uint8_t slot_id, uint16_t session_number,
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uint8_t *data, uint32_t data_length)
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{
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// parse the length field
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int length_field_len;
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uint16_t asn_data_length;
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if ((length_field_len = asn_1_decode(&asn_data_length, data, data_length)) < 0) {
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print(LOG_LEVEL, ERROR, 1, "Received data with invalid length from module on slot %02x\n", slot_id);
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return -1;
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}
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// check it
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if (asn_data_length < 6) {
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print(LOG_LEVEL, ERROR, 1, "Received short data\n");
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return -1;
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}
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if (asn_data_length > (data_length - length_field_len)) {
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print(LOG_LEVEL, ERROR, 1, "Received short data\n");
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return -1;
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}
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uint8_t *app_info = data + length_field_len;
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// parse the fields
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uint8_t application_type = app_info[0];
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uint16_t application_manufacturer = (app_info[1] << 8) | app_info[2];
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uint16_t manufacturer_code = (app_info[3] << 8) | app_info[4];
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uint8_t menu_string_length = app_info[5];
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uint8_t *menu_string = app_info + 6;
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// check the menu_string_length
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if (menu_string_length > (asn_data_length-6)) {
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print(LOG_LEVEL, ERROR, 1, "Received bad menu string length - adjusting\n");
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menu_string_length = asn_data_length-6;
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}
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// tell the app
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pthread_mutex_lock(&private->lock);
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en50221_app_ai_callback cb = private->callback;
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void *cb_arg = private->callback_arg;
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pthread_mutex_unlock(&private->lock);
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if (cb) {
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return cb(cb_arg, slot_id, session_number, application_type,
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application_manufacturer, manufacturer_code, menu_string_length, menu_string);
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}
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return 0;
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}
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