/** @brief, tell if the eit have a newer version than the one recorded actually
* In the EIT pid there is a field to say if the EIT was updated
* This function check if it has changed (in order to rewrite the eit only once)
* Note this function can give false positive since it doesn't check the CRC32
*
*@param rewrite_vars the parameters for eit rewriting
*@param buf : the received buffer
*/
int eit_need_update(rewrite_parameters_t *rewrite_vars, unsigned char *buf, int raw)
{
//Get the SID of the new EIT
//loop over the stored EIT
//if found and version > : need update
//if not found need update
eit_t *eit;
//if it's a raw TS packet we search for the beginning
if(raw)
eit=(eit_t*)(get_ts_begin(buf));
else
eit=(eit_t*)(buf);
eit_packet_t *eit_packet;
if(eit) //It's the beginning of a new packet
{
eit_packet=eit_find_by_tsid(rewrite_vars,HILO(eit->service_id));
if(eit_packet==NULL)
{
log_message( log_module, MSG_DETAIL,"EIT sid %d not stored, need update.",
HILO(eit->service_id));
return 1;
}
// if((eit->table_id==0x4E)||((eit->table_id&0xF0)==0x50))
//if((eit->table_id&0xF0)==0x50)
// log_message( log_module, MSG_DETAIL,"EIT table id 0x%x schedule not supported yet.",eit->table_id);
if(eit->table_id==0x4E)
// 0x4E event_information_section - actual_transport_stream, present/following
// 0x50 to 0x5F event_information_section - actual_transport_stream, schedule
//TODO : deal with all these table id_ which could have different version number for the same service
{
/*current_next_indicator – A 1-bit indicator, which when set to '1' indicates that the table
sent is currently applicable.*/
if(eit->current_next_indicator == 0)
return 0;
if(eit->version_number!=eit_packet->version)
{
log_message( log_module, MSG_DETAIL,"EIT sid %d need update. stored version : %d, new: %d",
HILO(eit->service_id),
eit_packet->version,
eit->version_number);
return 1;
}
if(!eit_packet->sections_stored[eit->section_number] )
{
log_message( log_module, MSG_DETAIL,"EIT sid %d new section %d version : %d",
HILO(eit->service_id),
eit->section_number,
eit_packet->version,
eit->version_number);
return 1;
}
}
}
return 0;
}
/** @brief This function is called when a new EIT packet for a channel is there and we asked for rewrite
* This function copy the rewritten EIT to the buffer. And checks if the EIT was changed so the rewritten version have to be updated
*/
void eit_rewrite_new_channel_packet(unsigned char *ts_packet, rewrite_parameters_t *rewrite_vars, mumudvb_channel_t *channel,
multicast_parameters_t *multicast_vars, unicast_parameters_t *unicast_vars, mumudvb_chan_and_pids_t *chan_and_pids,fds_t *fds)
{
int i=0;
//If payload unit start indicator , we will send all the present EIT for this service, otherwise nothing
//We generate the TS packets on by one, and for each one, we check if we have to send
//Otherwise we skip the packet
//If payload unit start indicator, we will send all the present EIT for this service, otherwise nothing
//just a matter to send an EIT per service only if an EIT is starting in the stream,
//the better way would be an EIT starting and corresponding to this SID but, it's more difficult to get this information
ts_header_t *ts_header=(ts_header_t *)ts_packet;
if(!(ts_header->payload_unit_start_indicator))
return;
//If there is an EIT PID sorted for this channel
eit_packet_t *eit_pkt;
eit_pkt=eit_find_by_tsid(rewrite_vars,channel->service_id);
if((eit_pkt==NULL)||(!eit_pkt->full_eit_ok))
return;
//search for the next section we can send
//just in case we have a new version with less sections
channel->eit_section_to_send=channel->eit_section_to_send % (eit_pkt->last_section_number+1);
//the real search
while((i<=eit_pkt->last_section_number)&&(!eit_pkt->sections_stored[channel->eit_section_to_send]))
{
channel->eit_section_to_send++;
channel->eit_section_to_send=channel->eit_section_to_send % (eit_pkt->last_section_number+1);
i++;
}
//if nothing found
if(!eit_pkt->sections_stored[channel->eit_section_to_send])
return; //bye
//ok we send this!
mumudvb_ts_packet_t *pkt_to_send;
int data_left_to_send,sent;
unsigned char send_buf[TS_PACKET_SIZE];
ts_header=(ts_header_t *)send_buf;
pkt_to_send=eit_pkt->full_eit_sections[channel->eit_section_to_send];
data_left_to_send=pkt_to_send->full_buffer_len;
sent=0;
//log_message(log_module,MSG_FLOOD,"Sending EIT to channel %s (sid %d) section %d data_len %d",
// channel->name,
// channel->service_id,
// channel->eit_section_to_send,
// data_left_to_send);
while(data_left_to_send>0)
{
int header_len;
memset(send_buf,0,TS_PACKET_SIZE*sizeof(unsigned char));
//we fill the TS header
ts_header->sync_byte=0x47;
if(sent==0)
{
ts_header->payload_unit_start_indicator=1;
header_len=TS_HEADER_LEN; //includes the pointer field
}
else
header_len=TS_HEADER_LEN-1; //the packet has started, we don't count the pointer field
ts_header->pid_lo=18; //specify the PID
ts_header->adaptation_field_control=1; //always one
ts_header->continuity_counter=channel->eit_cc; //continuity counter
channel->eit_cc++;
channel->eit_cc= channel->eit_cc % 16;
//We send the data
//plus one because of pointer field
if(data_left_to_send>(TS_PACKET_SIZE-header_len))
{
memcpy(send_buf+header_len,pkt_to_send->data_full+sent,(TS_PACKET_SIZE-header_len)*sizeof(unsigned char));
sent+=(TS_PACKET_SIZE-header_len);
data_left_to_send-=(TS_PACKET_SIZE-header_len);
}
else
{
memcpy(send_buf+header_len,pkt_to_send->data_full+sent,data_left_to_send*sizeof(unsigned char));
sent+=data_left_to_send;
//Padding with OxFF
memset(send_buf+header_len+data_left_to_send,
0xFF,
(TS_PACKET_SIZE-(header_len+data_left_to_send))*sizeof(unsigned char));
data_left_to_send=0;
}
//NOW we really send the data over the network
// we fill the channel buffer
memcpy(channel->buf + channel->nb_bytes, send_buf, TS_PACKET_SIZE*sizeof(unsigned char));
channel->nb_bytes += TS_PACKET_SIZE;
//The buffer is full, we send it
if ((!multicast_vars->rtp_header && ((channel->nb_bytes + TS_PACKET_SIZE) > MAX_UDP_SIZE))
||(multicast_vars->rtp_header && ((channel->nb_bytes + RTP_HEADER_LEN + TS_PACKET_SIZE) > MAX_UDP_SIZE)))
{
uint64_t now_time;
now_time=get_time();
send_func(channel, &now_time, unicast_vars, multicast_vars, chan_and_pids, fds);
}
}
//We update which section we want to send
channel->eit_section_to_send++;
channel->eit_section_to_send=channel->eit_section_to_send % (eit_pkt->last_section_number+1);
//TODO increase table id if we reached the end
}
/** @brief This function is called when a new EIT packet for a channel is there and we asked for rewrite
* This function copy the rewritten EIT to the buffer. And checks if the EIT was changed so the rewritten version have to be updated
*/
void eit_rewrite_new_channel_packet(unsigned char *ts_packet, rewrite_parameters_t *rewrite_vars, mumudvb_channel_t *channel,
multi_p_t *multi_p, unicast_parameters_t *unicast_vars, void *scam_vars_v,fds_t *fds)
{
int i=0;
//If payload unit start indicator , we will send all the present EIT for this service, otherwise nothing
//We generate the TS packets on by one, and for each one, we check if we have to send
//Otherwise we skip the packet
//If payload unit start indicator, we will send all the present EIT for this service, otherwise nothing
//just a matter to send an EIT per service only if an EIT is starting in the stream,
//the better way would be an EIT starting and corresponding to this SID but, it's more difficult to get this information
ts_header_t *ts_header=(ts_header_t *)ts_packet;
if(!(ts_header->payload_unit_start_indicator))
return;
//If there is an EIT PID sorted for this channel
eit_packet_t *eit_pkt;
uint8_t section_start;
//we check we start with a valid section
if((channel->eit_table_id_to_send!=0x4E)&&((channel->eit_table_id_to_send&0xF0)!=0x50))
channel->eit_table_id_to_send=0x4E;
//We search for the EIT packet to send, if not found we loop on the sections
section_start=channel->eit_table_id_to_send;
do
{
eit_pkt=eit_find_by_tsid(rewrite_vars,channel->service_id,channel->eit_table_id_to_send);
//loop over the table id
if((eit_pkt==NULL)||(!eit_pkt->full_eit_ok))
{
channel->eit_table_id_to_send=eit_next_table_id(channel->eit_table_id_to_send);
eit_pkt=NULL;
}
}
while((eit_pkt==NULL)&&(channel->eit_table_id_to_send!=section_start));
//we go away if there is no EIT packet to send
if(eit_pkt==NULL)
return;
//search for the next section we can send
//just in case we have a new version with less sections
channel->eit_section_to_send=channel->eit_section_to_send % (eit_pkt->last_section_number+1);
//the real search
while((i<=eit_pkt->last_section_number)&&(!eit_pkt->sections_stored[channel->eit_section_to_send]))
{
channel->eit_section_to_send++;
channel->eit_section_to_send=channel->eit_section_to_send % (eit_pkt->last_section_number+1);
i++;
}
//if nothing found
if(!eit_pkt->sections_stored[channel->eit_section_to_send])
{
//bye (we should be here BTW) but we avoid to stay on invalid packet by going to next section
channel->eit_table_id_to_send=eit_next_table_id(channel->eit_table_id_to_send);
return;
}
//ok we send this!
mumudvb_ts_packet_t *pkt_to_send;
int data_left_to_send,sent;
unsigned char send_buf[TS_PACKET_SIZE];
ts_header=(ts_header_t *)send_buf;
pkt_to_send=eit_pkt->full_eit_sections[channel->eit_section_to_send];
data_left_to_send=pkt_to_send->len_full;
sent=0;
//log_message(log_module,MSG_FLOOD,"Sending EIT to channel %s (sid %d) section %d table_id 0x%02x data_len %d",
// channel->name,
// channel->service_id,
// channel->eit_section_to_send,
// channel->eit_table_id_to_send,
// data_left_to_send);
while(data_left_to_send>0)
{
int header_len;
memset(send_buf,0,TS_PACKET_SIZE*sizeof(unsigned char));
//we fill the TS header
ts_header->sync_byte=0x47;
if(sent==0)
{
ts_header->payload_unit_start_indicator=1;
header_len=TS_HEADER_LEN; //includes the pointer field
}
else
header_len=TS_HEADER_LEN-1; //the packet has started, we don't count the pointer field
ts_header->pid_lo=18; //specify the PID
ts_header->adaptation_field_control=1; //always one
ts_header->continuity_counter=channel->eit_cc; //continuity counter
channel->eit_cc++;
channel->eit_cc= channel->eit_cc % 16;
//We send the data
//plus one because of pointer field
if(data_left_to_send>=(TS_PACKET_SIZE-header_len))
{
memcpy(send_buf+header_len,pkt_to_send->data_full+sent,(TS_PACKET_SIZE-header_len)*sizeof(unsigned char));
sent+=(TS_PACKET_SIZE-header_len);
data_left_to_send-=(TS_PACKET_SIZE-header_len);
}
else
{
memcpy(send_buf+header_len,pkt_to_send->data_full+sent,data_left_to_send*sizeof(unsigned char));
sent+=data_left_to_send;
//Padding with OxFF
memset(send_buf+header_len+data_left_to_send,
0xFF,
(TS_PACKET_SIZE-(header_len+data_left_to_send))*sizeof(unsigned char));
data_left_to_send=0;
}
//NOW we fill the channel buffer for sending
buffer_func(channel, send_buf, unicast_vars, multi_p, scam_vars_v, fds);
}
//We update which section we want to send
channel->eit_section_to_send++;
channel->eit_section_to_send=channel->eit_section_to_send % (eit_pkt->last_section_number+1);
//if we reached the end, we go to the next table_id
if(channel->eit_section_to_send==0)
channel->eit_table_id_to_send=eit_next_table_id(channel->eit_table_id_to_send);
}