/*****************************************************************************
* Entry point
*****************************************************************************/
int main( int i_argc, char **pp_argv )
{
int c;
int i_priority = -1;
int i_ttl = 0;
bool b_udp = false;
struct pollfd pfd[2];
while ( (c = getopt( i_argc, pp_argv, "i:t:wo:x:X:Um:R:h" )) != -1 )
{
switch ( c )
{
case 'i':
i_priority = strtol( optarg, NULL, 0 );
break;
case 't':
i_ttl = strtol( optarg, NULL, 0 );
break;
case 'w':
b_overwrite_timestamps = true;
break;
case 'o':
{
struct in_addr maddr;
if ( !inet_aton( optarg, &maddr ) )
usage();
i_ssrc = maddr.s_addr;
b_overwrite_ssrc = true;
break;
}
case 'x':
i_retx_buffer = strtoll( optarg, NULL, 0 ) * 27000;
break;
case 'X':
i_retx_fd = OpenSocket( optarg, 0, 0, 0, NULL, &b_retx_tcp, NULL );
if ( i_retx_fd == -1 )
{
msg_Err( NULL, "unable to set up retx with %s\n", optarg );
exit(EXIT_FAILURE);
}
pfd[1].fd = i_retx_fd;
pfd[1].events = POLLIN | POLLERR | POLLRDHUP | POLLHUP;
p_retx_block = malloc( sizeof(block_t) + RETX_HEADER_SIZE );
p_retx_block->p_data = (uint8_t *)p_retx_block + sizeof(block_t);
p_retx_block->i_size = 0;
break;
case 'U':
b_udp = true;
break;
case 'm':
i_asked_payload_size = strtol( optarg, NULL, 0 );
break;
case 'R':
i_rtp_header_size = strtol( optarg, NULL, 0 );
break;
case 'h':
default:
usage();
break;
}
}
if ( optind >= i_argc - 1 )
usage();
i_input_fd = OpenSocket( pp_argv[optind], 0, DEFAULT_PORT, 0, NULL,
&b_input_tcp, NULL );
if ( i_input_fd == -1 )
{
msg_Err( NULL, "unable to open input socket" );
exit(EXIT_FAILURE);
}
optind++;
pfd[0].fd = i_input_fd;
pfd[0].events = POLLIN | POLLERR | POLLRDHUP | POLLHUP;
while ( optind < i_argc )
{
p_outputs = realloc( p_outputs, ++i_nb_outputs * sizeof(output_t) );
p_outputs[i_nb_outputs - 1].i_fd =
OpenSocket( pp_argv[optind++], i_ttl, 0, DEFAULT_PORT,
&p_outputs[i_nb_outputs - 1].i_weight, NULL, NULL );
if ( p_outputs[i_nb_outputs - 1].i_fd == -1 )
{
msg_Err( NULL, "unable to open output socket" );
exit(EXIT_FAILURE);
}
p_outputs[i_nb_outputs - 1].i_weighted_size =
p_outputs[i_nb_outputs - 1].i_remainder = 0;
i_max_weight += p_outputs[i_nb_outputs - 1].i_weight;
}
msg_Dbg( NULL, "%d outputs weight %u%s", i_nb_outputs, i_max_weight,
i_retx_fd != -1 ? ", with retx" : "" );
if ( i_priority > 0 )
{
struct sched_param param;
int i_error;
memset( ¶m, 0, sizeof(struct sched_param) );
param.sched_priority = i_priority;
if ( (i_error = pthread_setschedparam( pthread_self(), SCHED_RR,
¶m )) )
{
msg_Warn( NULL, "couldn't set thread priority: %s",
strerror(i_error) );
}
}
for ( ; ; )
{
uint64_t i_current_date;
if ( poll( pfd, i_retx_fd == -1 ? 1 : 2, -1 ) < 0 )
{
int saved_errno = errno;
msg_Warn( NULL, "couldn't poll(): %s", strerror(errno) );
if ( saved_errno == EINTR ) continue;
exit(EXIT_FAILURE);
}
i_current_date = wall_Date();
if ( (pfd[0].revents & (POLLERR | POLLRDHUP | POLLHUP)) ||
(i_retx_fd != -1 &&
(pfd[1].revents & (POLLERR | POLLRDHUP | POLLHUP))))
{
msg_Err( NULL, "poll error\n" );
exit(EXIT_FAILURE);
}
if ( pfd[0].revents & POLLIN )
{
/* Read input block */
ssize_t i_size, i_wanted_size;
uint8_t *p_read_buffer;
if ( b_udp )
i_wanted_size = i_asked_payload_size + RTP_HEADER_SIZE;
else
i_wanted_size = i_asked_payload_size + i_rtp_header_size;
if ( p_input_block == NULL )
{
if ( b_udp )
{
p_input_block = malloc( sizeof(block_t) +
i_asked_payload_size +
RTP_HEADER_SIZE );
p_input_block->i_size = RTP_HEADER_SIZE;
}
else
{
p_input_block = malloc( sizeof(block_t) +
i_asked_payload_size +
i_rtp_header_size );
p_input_block->p_data = (uint8_t *)p_input_block +
sizeof(block_t);
p_input_block->i_size = 0;
}
p_input_block->p_data = (uint8_t *)p_input_block +
sizeof(block_t);
}
p_read_buffer = p_input_block->p_data + p_input_block->i_size;
i_wanted_size -= p_input_block->i_size;
i_size = read( i_input_fd, p_read_buffer, i_wanted_size );
if ( i_size < 0 && errno != EAGAIN && errno != EINTR )
{
msg_Err( NULL, "unrecoverable read error, dying (%s)",
strerror(errno) );
exit(EXIT_FAILURE);
}
if ( i_size <= 0 ) continue;
p_input_block->i_size += i_size;
if ( b_input_tcp && i_size != i_wanted_size )
continue;
if ( b_udp )
{
rtp_set_hdr( p_input_block->p_data );
rtp_set_type( p_input_block->p_data, RTP_TYPE_TS );
rtp_set_seqnum( p_input_block->p_data, i_rtp_seqnum );
i_rtp_seqnum++;
rtp_set_ssrc( p_input_block->p_data, (uint8_t *)&i_ssrc );
/* this isn't RFC-compliant, but we assume that at the other
* end, the RTP header will be stripped */
rtp_set_timestamp( p_input_block->p_data,
i_current_date / 300 );
}
else
{
if ( b_overwrite_ssrc )
rtp_set_ssrc( p_input_block->p_data,
(uint8_t *)&i_ssrc );
if ( b_overwrite_timestamps )
rtp_set_timestamp( p_input_block->p_data,
i_current_date / 300 );
}
/* Output block */
output_t *p_output = NextOutput();
SendBlock( p_output->i_fd, NULL, 0, p_input_block );
p_output->i_weighted_size += (i_size + p_output->i_remainder)
/ p_output->i_weight;
p_output->i_remainder = (i_size + p_output->i_remainder)
% p_output->i_weight;
if ( i_retx_fd != -1 )
RetxQueue( p_input_block, i_current_date );
else
free( p_input_block );
p_input_block = NULL;
}
if ( i_retx_fd != -1 && (pfd[1].revents & POLLIN) )
RetxHandle();
}
return EXIT_SUCCESS;
}
/*****************************************************************************
* RetxHandle: handle a retx query
*****************************************************************************/
static void RetxHandle( int i_fd )
{
ssize_t i_size = RETX_HEADER_SIZE - p_retx_block->i_size;
uint8_t *p_buffer = p_retx_block->p_data + p_retx_block->i_size;
sockaddr_t sout;
socklen_t i_len = sizeof(sout);
i_size = recvfrom( i_fd, p_buffer, i_size, 0, &sout.so, &i_len );
if ( i_size < 0 && errno != EAGAIN && errno != EINTR &&
errno != ECONNREFUSED )
{
msg_Err( NULL, "unrecoverable read error, dying (%s)",
strerror(errno) );
exit(EXIT_FAILURE);
}
if ( i_size <= 0 ) return;
p_retx_block->i_size += i_size;
if ( p_retx_block->i_size != RETX_HEADER_SIZE )
{
if ( b_retx_tcp ) return;
msg_Err( NULL, "invalid retx packet received, dying" );
exit(EXIT_FAILURE);
}
if ( !retx_check(p_retx_block->p_data) )
{
msg_Err( NULL, "invalid retx packet, dying" );
exit(EXIT_FAILURE);
}
uint16_t i_seqnum = retx_get_seqnum(p_retx_block->p_data);
uint16_t i_num = retx_get_num(p_retx_block->p_data);
block_t *p_block = p_retx_first;
p_retx_block->i_size = 0;
while ( p_block != NULL )
{
if ( rtp_get_seqnum(p_block->p_data) == i_seqnum )
break;
p_block = p_block->p_next;
}
if ( p_block == NULL )
{
msg_Warn( NULL, "unable to find packet %hu for retx", i_seqnum );
return;
}
while ( i_num && p_block != NULL )
{
if ( i_retx_fd == -1 )
{
output_t *p_output = NextOutput();
SendBlock( p_output->i_fd, NULL, 0, p_block );
}
else
{
SendBlock( i_retx_fd, i_len ? &sout.so : NULL, i_len, p_block );
}
p_block = p_block->p_next;
i_num--;
}
if ( i_num )
msg_Warn( NULL, "unable to find %hu packets after %hu", i_num,
i_seqnum );
}
