+/*****************************************************************************
+ * BlockScan:
+ *****************************************************************************/
+static block_t *BlockScan( access_t *p_access )
+{
+ access_sys_t *p_sys = p_access->p_sys;
+ scan_t *p_scan = &p_sys->scan;
+ scan_configuration_t cfg;
+ scan_session_t session;
+
+ /* */
+ if( scan_Next( p_scan, &cfg ) )
+ {
+ const bool b_first_eof = !p_access->info.b_eof;
+
+ if( b_first_eof )
+ msg_Warn( p_access, "Scanning finished" );
+
+ /* */
+ p_access->info.b_eof = true;
+ return b_first_eof ? scan_GetM3U( p_scan ) : NULL;
+ }
+
+ /* */
+
+ if( scan_session_Init( VLC_OBJECT(p_access), &session, &cfg ) )
+ return NULL;
+
+ /* */
+ msg_Dbg( p_access, "Scanning frequency %d", cfg.i_frequency );
+ var_SetInteger( p_access, "dvb-frequency", cfg.i_frequency );
+ var_SetInteger( p_access, "dvb-bandwidth", cfg.i_bandwidth );
+
+ /* Setting frontend parameters for tuning the hardware */
+ if( FrontendSet( p_access ) < 0 )
+ {
+ msg_Err( p_access, "Failed to tune the frontend" );
+ p_access->info.b_eof = true;
+ return NULL;
+ }
+
+ /* */
+ int64_t i_scan_start = mdate();
+
+ bool b_has_dvb_signal = false;
+ bool b_has_lock = false;
+ int i_best_snr = -1;
+
+ for ( ; ; )
+ {
+ struct pollfd ufds[2];
+ int i_ret;
+
+ /* Initialize file descriptor sets */
+ memset (ufds, 0, sizeof (ufds));
+ ufds[0].fd = p_sys->i_handle;
+ ufds[0].events = POLLIN;
+ ufds[1].fd = p_sys->i_frontend_handle;
+ ufds[1].events = POLLPRI;
+
+ /* We'll wait 0.1 second if nothing happens */
+ /* Find if some data is available */
+ i_ret = poll( ufds, 2, 100 );
+
+ if( !vlc_object_alive (p_access) || scan_IsCancelled( p_scan ) )
+ break;
+
+ if( i_ret <= 0 )
+ {
+ const mtime_t i_scan_time = mdate() - i_scan_start;
+ frontend_status_t status;
+
+ FrontendGetStatus( p_access, &status );
+
+ b_has_dvb_signal |= status.b_has_carrier;
+ b_has_lock |= status.b_has_lock;
+
+ if( ( !b_has_dvb_signal && i_scan_time > DVB_SCAN_MAX_SIGNAL_TIME ) ||
+ ( !b_has_lock && i_scan_time > DVB_SCAN_MAX_LOCK_TIME ) ||
+ ( i_scan_time > DVB_SCAN_MAX_PROBE_TIME ) )
+ {
+ msg_Dbg( p_access, "timed out scanning current frequency (s=%d l=%d)", b_has_dvb_signal, b_has_lock );
+ break;
+ }
+ }
+
+ if( i_ret < 0 )
+ {
+ if( errno == EINTR )
+ continue;
+
+ msg_Err( p_access, "poll error: %m" );
+ scan_session_Clean( p_scan, &session );
+
+ p_access->info.b_eof = true;
+ return NULL;
+ }
+
+ if( ufds[1].revents )
+ {
+ frontend_statistic_t stat;
+
+ FrontendPoll( p_access );
+
+ if( !FrontendGetStatistic( p_access, &stat ) )
+ {
+ if( stat.i_snr > i_best_snr )
+ i_best_snr = stat.i_snr;
+ }
+ }
+
+ if ( p_sys->i_frontend_timeout && mdate() > p_sys->i_frontend_timeout )
+ {
+ msg_Warn( p_access, "no lock, tuning again" );
+ FrontendSet( p_access );
+ }
+
+ if ( ufds[0].revents )
+ {
+ const int i_read_once = 1;
+ block_t *p_block = block_New( p_access, i_read_once * TS_PACKET_SIZE );
+
+ if( ( i_ret = read( p_sys->i_handle, p_block->p_buffer,
+ i_read_once * TS_PACKET_SIZE ) ) <= 0 )
+ {
+ msg_Warn( p_access, "read failed (%m)" );
+ block_Release( p_block );
+ continue;
+ }
+ p_block->i_buffer = i_ret;
+
+ /* */
+ if( scan_session_Push( &session, p_block ) )
+ {
+ msg_Dbg( p_access, "finished scanning current frequency" );
+ break;
+ }
+ }
+ }
+
+ /* */
+ if( i_best_snr > 0 )
+ scan_service_SetSNR( &session, i_best_snr );
+
+ scan_session_Clean( p_scan, &session );
+ return NULL;
+}
+