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/*
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_dvb.h"
#include "en50221_app_tags.h"
#include "asn_1.h"
struct en50221_app_dvb {
struct en50221_app_send_functions *funcs;
en50221_app_dvb_tune_callback tune_callback;
void *tune_callback_arg;
en50221_app_dvb_replace_callback replace_callback;
void *replace_callback_arg;
en50221_app_dvb_clear_replace_callback clear_replace_callback;
void *clear_replace_callback_arg;
pthread_mutex_t lock;
};
static int en50221_app_dvb_parse_tune(struct en50221_app_dvb *dvb,
uint8_t slot_id,
uint16_t session_number,
uint8_t * data,
uint32_t data_length);
static int en50221_app_dvb_parse_replace(struct en50221_app_dvb *dvb,
uint8_t slot_id,
uint16_t session_number,
uint8_t * data,
uint32_t data_length);
static int en50221_app_dvb_parse_clear_replace(struct en50221_app_dvb *dvb,
uint8_t slot_id,
uint16_t session_number,
uint8_t * data,
uint32_t data_length);
struct en50221_app_dvb *en50221_app_dvb_create(struct en50221_app_send_functions *funcs)
{
struct en50221_app_dvb *dvb = NULL;
// create structure and set it up
dvb = malloc(sizeof(struct en50221_app_dvb));
if (dvb == NULL) {
return NULL;
}
dvb->funcs = funcs;
dvb->tune_callback = NULL;
dvb->replace_callback = NULL;
dvb->clear_replace_callback = NULL;
pthread_mutex_init(&dvb->lock, NULL);
// done
return dvb;
}
void en50221_app_dvb_destroy(struct en50221_app_dvb *dvb)
{
pthread_mutex_destroy(&dvb->lock);
free(dvb);
}
void en50221_app_dvb_register_tune_callback(struct en50221_app_dvb *dvb,
en50221_app_dvb_tune_callback callback,
void *arg)
{
pthread_mutex_lock(&dvb->lock);
dvb->tune_callback = callback;
dvb->tune_callback_arg = arg;
pthread_mutex_unlock(&dvb->lock);
}
void en50221_app_dvb_register_replace_callback(struct en50221_app_dvb *dvb,
en50221_app_dvb_replace_callback callback,
void *arg)
{
pthread_mutex_lock(&dvb->lock);
dvb->replace_callback = callback;
dvb->replace_callback_arg = arg;
pthread_mutex_unlock(&dvb->lock);
}
void en50221_app_dvb_register_clear_replace_callback(struct en50221_app_dvb *dvb,
en50221_app_dvb_clear_replace_callback callback,
void *arg)
{
pthread_mutex_lock(&dvb->lock);
dvb->clear_replace_callback = callback;
dvb->clear_replace_callback_arg = arg;
pthread_mutex_unlock(&dvb->lock);
}
int en50221_app_dvb_ask_release(struct en50221_app_dvb *dvb,
uint16_t session_number)
{
uint8_t data[4];
data[0] = (TAG_ASK_RELEASE >> 16) & 0xFF;
data[1] = (TAG_ASK_RELEASE >> 8) & 0xFF;
data[2] = TAG_ASK_RELEASE & 0xFF;
data[3] = 0;
return dvb->funcs->send_data(dvb->funcs->arg, session_number, data, 4);
}
int en50221_app_dvb_message(struct en50221_app_dvb *dvb,
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_TUNE:
return en50221_app_dvb_parse_tune(dvb, slot_id,
session_number, data + 3,
data_length - 3);
case TAG_REPLACE:
return en50221_app_dvb_parse_replace(dvb, slot_id,
session_number,
data + 3,
data_length - 3);
case TAG_CLEAR_REPLACE:
return en50221_app_dvb_parse_clear_replace(dvb, 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_dvb_parse_tune(struct en50221_app_dvb *dvb,
uint8_t slot_id,
uint16_t session_number,
uint8_t * data, uint32_t data_length)
{
// validate data
if (data_length < 9) {
print(LOG_LEVEL, ERROR, 1, "Received short data\n");
return -1;
}
if (data[0] != 8) {
print(LOG_LEVEL, ERROR, 1, "Received short data\n");
return -1;
}
uint8_t *tune_data = data + 1;
// parse it
uint16_t network_id = (tune_data[0] << 8) | tune_data[1];
uint16_t original_network_id = (tune_data[2] << 8) | tune_data[3];
uint16_t transport_stream_id = (tune_data[4] << 8) | tune_data[5];
uint16_t service_id = (tune_data[6] << 8) | tune_data[7];
// tell the app
pthread_mutex_lock(&dvb->lock);
en50221_app_dvb_tune_callback cb = dvb->tune_callback;
void *cb_arg = dvb->tune_callback_arg;
pthread_mutex_unlock(&dvb->lock);
if (cb) {
return cb(cb_arg, slot_id, session_number, network_id,
original_network_id, transport_stream_id,
service_id);
}
return 0;
}
static int en50221_app_dvb_parse_replace(struct en50221_app_dvb *dvb,
uint8_t slot_id,
uint16_t session_number,
uint8_t * data,
uint32_t data_length)
{
// validate data
if (data_length < 6) {
print(LOG_LEVEL, ERROR, 1, "Received short data\n");
return -1;
}
if (data[0] != 5) {
print(LOG_LEVEL, ERROR, 1, "Received short data\n");
return -1;
}
uint8_t *replace_data = data + 1;
// parse it
uint8_t replacement_ref = replace_data[0];
uint16_t replace_pid =
((replace_data[1] & 0x1f) << 8) | replace_data[2];
uint16_t replacement_pid =
((replace_data[3] & 0x1f) << 8) | replace_data[4];
// tell the app
pthread_mutex_lock(&dvb->lock);
en50221_app_dvb_replace_callback cb = dvb->replace_callback;
void *cb_arg = dvb->replace_callback_arg;
pthread_mutex_unlock(&dvb->lock);
if (cb) {
return cb(cb_arg, slot_id, session_number, replacement_ref,
replace_pid, replacement_pid);
}
return 0;
}
static int en50221_app_dvb_parse_clear_replace(struct en50221_app_dvb *dvb,
uint8_t slot_id,
uint16_t session_number,
uint8_t * data,
uint32_t data_length)
{
// validate data
if (data_length < 2) {
print(LOG_LEVEL, ERROR, 1, "Received short data\n");
return -1;
}
if (data[0] != 1) {
print(LOG_LEVEL, ERROR, 1, "Received short data\n");
return -1;
}
uint8_t *replace_data = data + 1;
// parse it
uint8_t replacement_ref = replace_data[0];
// tell the app
pthread_mutex_lock(&dvb->lock);
en50221_app_dvb_clear_replace_callback cb =
dvb->clear_replace_callback;
void *cb_arg = dvb->clear_replace_callback_arg;
pthread_mutex_unlock(&dvb->lock);
if (cb) {
return cb(cb_arg, slot_id, session_number,
replacement_ref);
}
return 0;
}
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