1 /*******************************************************************************
2 * input.c: input thread
4 *******************************************************************************
5 * Read an MPEG2 stream, demultiplex and parse it before sending it to
7 ******************************************************************************/
9 /*******************************************************************************
11 *******************************************************************************/
21 #include <sys/ioctl.h>
23 #include <netinet/in.h>
28 #include "vlc_thread.h"
33 #include "input_psi.h"
34 #include "input_pcr.h"
35 #include "input_netlist.h"
36 #include "decoder_fifo.h"
37 #include "input_file.h"
38 #include "input_network.h"
40 #include "audio_output.h"
41 #include "audio_decoder.h"
44 #include "video_output.h"
45 #include "video_decoder.h"
48 /******************************************************************************
50 ******************************************************************************/
51 static void RunThread ( input_thread_t *p_input );
52 static void ErrorThread ( input_thread_t *p_input );
53 static void EndThread ( input_thread_t *p_input );
55 static __inline__ int input_ReadPacket( input_thread_t *p_input );
56 static __inline__ void input_SortPacket( input_thread_t *p_input,
57 ts_packet_t *ts_packet );
58 static __inline__ void input_DemuxTS( input_thread_t *p_input,
59 ts_packet_t *ts_packet,
60 es_descriptor_t *es_descriptor );
61 static __inline__ void input_DemuxPES( input_thread_t *p_input,
62 ts_packet_t *ts_packet,
63 es_descriptor_t *p_es_descriptor,
64 boolean_t b_unit_start, boolean_t b_packet_lost );
65 static __inline__ void input_DemuxPSI( input_thread_t *p_input,
66 ts_packet_t *ts_packet,
67 es_descriptor_t *p_es_descriptor,
68 boolean_t b_unit_start, boolean_t b_packet_lost );
70 /*******************************************************************************
71 * input_CreateThread: creates a new input thread
72 *******************************************************************************
73 * This function creates a new input, and returns a pointer
74 * to its description. On error, it returns NULL.
75 * If pi_status is NULL, then the function will block until the thread is ready.
76 * If not, it will be updated using one of the THREAD_* constants.
77 *******************************************************************************/
78 input_thread_t *input_CreateThread ( int i_method, char *psz_source, int i_port, int i_vlan,
79 p_vout_thread_t p_vout, p_aout_thread_t p_aout, int *pi_status )
81 input_thread_t * p_input; /* thread descriptor */
82 int i_status; /* thread status */
83 int i_index; /* index for tables initialization */
85 /* Allocate descriptor */
87 p_input = (input_thread_t *)malloc( sizeof(input_thread_t) );
90 intf_ErrMsg("error: %s\n", strerror(ENOMEM));
94 /* Initialize thread properties */
97 p_input->pi_status = (pi_status != NULL) ? pi_status : &i_status;
98 *p_input->pi_status = THREAD_CREATE;
100 /* Initialize input method description */
101 p_input->i_method = i_method;
102 p_input->psz_source = psz_source;
103 p_input->i_port = i_port;
104 p_input->i_vlan = i_vlan;
107 case INPUT_METHOD_TS_FILE: /* file methods */
108 p_input->p_Open = input_FileOpen;
109 p_input->p_Read = input_FileRead;
110 p_input->p_Close = input_FileClose;
112 case INPUT_METHOD_TS_VLAN_BCAST: /* vlan network method */
113 if( !p_main->b_vlans )
115 intf_ErrMsg("error: vlans are not activated\n");
119 /* ... pass through */
120 case INPUT_METHOD_TS_UCAST: /* network methods */
121 case INPUT_METHOD_TS_MCAST:
122 case INPUT_METHOD_TS_BCAST:
123 p_input->p_Open = input_NetworkOpen;
124 p_input->p_Read = input_NetworkRead;
125 p_input->p_Close = input_NetworkClose;
128 intf_ErrMsg("error: unknow input method\n");
134 /* Initialize stream description */
135 for( i_index = 0; i_index < INPUT_MAX_ES; i_index++ )
137 p_input->p_es[i_index].i_id = EMPTY_PID;
140 /* Initialize default settings for spawned decoders */
141 p_input->p_aout = p_aout;
142 p_input->p_vout = p_vout;
145 /* Initialize statistics */
146 p_input->c_loops = 0;
147 p_input->c_bytes = 0;
148 p_input->c_payload_bytes = 0;
149 p_input->c_packets_read = 0;
150 p_input->c_packets_trashed = 0;
153 /* Initialize PSI and PCR decoders */
154 if( input_PsiInit( p_input ) )
160 if( input_PcrInit( p_input ) )
162 input_PsiEnd( p_input );
167 /* Initialize netlists */
168 if( input_NetlistInit( p_input ) )
170 input_PsiEnd( p_input );
171 input_PcrEnd( p_input );
176 intf_DbgMsg("configuration: method=%d, source=%s, port=%d, vlan=%d\n",
177 i_method, psz_source, i_port, i_vlan );
179 /* Let the appropriate method open the socket. */
180 if( p_input->p_Open( p_input ) )
182 input_NetlistEnd( p_input );
183 input_PsiEnd( p_input );
184 input_PcrEnd( p_input );
189 /* Create thread and set locks. */
190 vlc_mutex_init( &p_input->netlist.lock );
191 vlc_mutex_init( &p_input->programs_lock );
192 vlc_mutex_init( &p_input->es_lock );
193 if( vlc_thread_create(&p_input->thread_id, "input", (void *) RunThread, (void *) p_input) )
195 intf_ErrMsg("error: %s\n", strerror(errno) );
196 p_input->p_Close( p_input );
197 input_NetlistEnd( p_input );;
198 input_PsiEnd( p_input );
199 input_PcrEnd( p_input );
204 intf_Msg("Input initialized\n");
206 /* If status is NULL, wait until the thread is created */
207 if( pi_status == NULL )
211 msleep( THREAD_SLEEP );
212 }while( (i_status != THREAD_READY) && (i_status != THREAD_ERROR)
213 && (i_status != THREAD_FATAL) );
214 if( i_status != THREAD_READY )
222 /******************************************************************************
223 * input_DestroyThread: mark an input thread as zombie
224 ******************************************************************************
225 * This function should not return until the thread is effectively cancelled.
226 ******************************************************************************/
227 void input_DestroyThread( input_thread_t *p_input, int *pi_status )
229 int i_status; /* thread status */
232 p_input->pi_status = (pi_status != NULL) ? pi_status : &i_status;
233 *p_input->pi_status = THREAD_DESTROY;
235 /* Request thread destruction */
238 /* If status is NULL, wait until thread has been destroyed */
239 if( pi_status == NULL )
243 msleep( THREAD_SLEEP );
244 }while( (i_status != THREAD_OVER) && (i_status != THREAD_ERROR)
245 && (i_status != THREAD_FATAL) );
250 /*******************************************************************************
251 * input_OpenAudioStream: open an audio stream
252 *******************************************************************************
253 * This function spawns an audio decoder and plugs it on the audio output
255 *******************************************************************************/
256 int input_OpenAudioStream( input_thread_t *p_input, int i_id )
261 /*******************************************************************************
262 * input_CloseAudioStream: close an audio stream
263 *******************************************************************************
264 * This function destroys an audio decoder.
265 *******************************************************************************/
266 void input_CloseAudioStream( input_thread_t *p_input, int i_id )
271 /*******************************************************************************
272 * input_OpenVideoStream: open a video stream
273 *******************************************************************************
274 * This function spawns a video decoder and plugs it on a video output thread.
275 *******************************************************************************/
276 int input_OpenVideoStream( input_thread_t *p_input,
277 struct vout_thread_s *p_vout, struct video_cfg_s * p_cfg )
282 /*******************************************************************************
283 * input_CloseVideoStream: close a video stream
284 *******************************************************************************
285 * This function destroys an video decoder.
286 *******************************************************************************/
287 void input_CloseVideoStream( input_thread_t *p_input, int i_id )
293 /* following functions are local */
295 /*******************************************************************************
296 * InitThread: initialize input thread
297 *******************************************************************************
298 * This function is called from RunThread and performs the second step of the
299 * initialization. It returns 0 on success. Note that the thread's flag are not
300 * modified inside this function.
301 *******************************************************************************/
302 static int InitThread( input_thread_t *p_input )
304 /* Mark thread as running and return */
306 *p_input->pi_status = THREAD_READY;
307 intf_DbgMsg("thread ready\n");
311 /*******************************************************************************
312 * RunThread: main thread loop
313 *******************************************************************************
314 * Thread in charge of processing the network packets and demultiplexing.
315 *******************************************************************************/
316 static void RunThread( input_thread_t *p_input )
319 * Initialize thread and free configuration
321 p_input->b_error = InitThread( p_input );
322 if( p_input->b_error )
324 free( p_input ); /* destroy descriptor */
332 while( !p_input->b_die && !p_input->b_error )
334 /* Scatter read the UDP packet from the network or the file. */
335 if( (input_ReadPacket( p_input )) == (-1) )
337 /* ??? Normally, a thread can't kill itself, but we don't have
338 * any method in case of an error condition ... */
339 p_input->b_error = 1;
350 if( p_input->b_error )
352 ErrorThread( p_input );
356 EndThread( p_input );
357 intf_DbgMsg("thread end\n");
361 /******************************************************************************
362 * ErrorThread: RunThread() error loop
363 *******************************************************************************
364 * This function is called when an error occured during thread main's loop.
365 ******************************************************************************/
366 static void ErrorThread( input_thread_t *p_input )
368 /* Wait until a `die' order */
370 while( !p_input->b_die )
373 msleep( VOUT_IDLE_SLEEP );
377 /*******************************************************************************
378 * EndThread: end the input thread
379 *******************************************************************************/
380 static void EndThread( input_thread_t * p_input )
382 int * pi_status; /* threas status */
383 int i_es_loop; /* es index */
387 pi_status = p_input->pi_status;
388 *pi_status = THREAD_END;
390 /* Close input method */
391 p_input->p_Close( p_input );
393 /* Destroy all decoder threads */
395 (i_es_loop < INPUT_MAX_ES) && (p_input->pp_selected_es[i_es_loop] != NULL) ;
398 switch( p_input->pp_selected_es[i_es_loop]->i_type )
403 vdec_DestroyThread( (vdec_thread_t*)(p_input->pp_selected_es[i_es_loop]->p_dec) /*, NULL */ );
405 vpar_DestroyThread( (vpar_thread_t*)(p_input->pp_selected_es[i_es_loop]->p_dec) /*, NULL */ );
410 adec_DestroyThread( (adec_thread_t*)(p_input->pp_selected_es[i_es_loop]->p_dec) );
413 ac3dec_DestroyThread( (ac3dec_thread_t *)(p_input->pp_selected_es[i_es_loop]->p_dec) );
417 intf_DbgMsg("error: unknown decoder type %d\n", p_input->pp_selected_es[i_es_loop]->i_type );
423 input_NetlistEnd( p_input ); /* clean netlist */
424 input_PsiEnd( p_input ); /* clean PSI information */
425 input_PcrEnd( p_input ); /* clean PCR information */
426 free( p_input ); /* free input_thread structure */
429 *pi_status = THREAD_OVER;
432 /*******************************************************************************
433 * input_ReadPacket: reads a packet from the network or the file
434 *******************************************************************************/
435 static __inline__ int input_ReadPacket( input_thread_t *p_input )
437 int i_base_index; /* index of the first free iovec */
440 #ifdef INPUT_LIFO_TS_NETLIST
441 int i_meanwhile_released;
442 int i_currently_removed;
444 ts_packet_t * p_ts_packet;
446 /* In this function, we only care about the TS netlist. PES netlist
447 * is for the demultiplexer. */
448 #ifdef INPUT_LIFO_TS_NETLIST
449 i_base_index = p_input->netlist.i_ts_index;
451 /* Verify that we still have packets in the TS netlist */
452 if( (INPUT_MAX_TS + INPUT_TS_READ_ONCE - 1 - p_input->netlist.i_ts_index) <= INPUT_TS_READ_ONCE )
454 intf_ErrMsg("input error: TS netlist is empty !\n");
458 #else /* FIFO netlist */
459 i_base_index = p_input->netlist.i_ts_start;
460 if( p_input->netlist.i_ts_start + INPUT_TS_READ_ONCE -1 > INPUT_MAX_TS )
462 /* The netlist is splitted in 2 parts. We must gather them to consolidate
463 the FIFO (we make the loop easily in having the same iovec at the far
464 end and in the beginning of netlist_free).
465 That's why the netlist is (INPUT_MAX_TS +1) + (INPUT_TS_READ_ONCE -1)
467 memcpy( p_input->netlist.p_ts_free + INPUT_MAX_TS + 1,
468 p_input->netlist.p_ts_free,
469 (p_input->netlist.i_ts_start + INPUT_TS_READ_ONCE - 1 - INPUT_MAX_TS)
470 * sizeof(struct iovec) );
473 /* Verify that we still have packets in the TS netlist */
474 if( ((p_input->netlist.i_ts_end -1 - p_input->netlist.i_ts_start) & INPUT_MAX_TS) <= INPUT_TS_READ_ONCE )
476 intf_ErrMsg("input error: TS netlist is empty !\n");
479 #endif /* FIFO netlist */
481 /* Scatter read the buffer. */
482 i_packet_size = (*p_input->p_Read)( p_input,
483 &p_input->netlist.p_ts_free[i_base_index],
484 INPUT_TS_READ_ONCE );
485 if( i_packet_size == (-1) )
487 // intf_DbgMsg("Read packet %d %p %d %d\n", i_base_index,
488 // &p_input->netlist.p_ts_free[i_base_index],
489 // p_input->netlist.i_ts_start,
490 // p_input->netlist.i_ts_end);
491 intf_ErrMsg("input error: readv() failed (%s)\n", strerror(errno));
495 if( i_packet_size == 0 )
497 /* No packet has been received, so stop here. */
501 /* Demultiplex the TS packets (1..INPUT_TS_READ_ONCE) received. */
502 for( i_current_index = i_base_index;
503 (i_packet_size -= TS_PACKET_SIZE) >= 0;
506 /* BTW, something REALLY bad could happen if we receive packets with
508 p_ts_packet = (ts_packet_t*)(p_input->netlist.p_ts_free[i_current_index].iov_base);
509 /* Don't cry :-), we are allowed to do that cast, because initially,
510 our buffer was malloc'ed with sizeof(ts_packet_t) */
512 /* Find out if we need this packet and demultiplex. */
513 input_SortPacket( p_input /* for current PIDs and netlist */,
517 if( i_packet_size > 0 )
519 intf_ErrMsg("input error: wrong size\n");
523 /* Remove the TS packets we have just filled from the netlist */
524 #ifdef INPUT_LIFO_TS_NETLIST
525 /* We need to take a lock here while we're calculating index positions. */
526 vlc_mutex_lock( &p_input->netlist.lock );
528 i_meanwhile_released = i_base_index - p_input->netlist.i_ts_index;
529 if( i_meanwhile_released )
531 /* That's where it becomes funny :-). Since we didn't take locks for
532 efficiency reasons, other threads (including ourselves, with
533 input_DemuxPacket) might have released packets to the netlist.
534 So we have to copy these iovec where they should go.
536 BTW, that explains why the TS netlist is
537 (INPUT_MAX_TS +1) + (TS_READ_ONCE -1) large. */
539 i_currently_removed = i_current_index - i_base_index;
540 if( i_meanwhile_released < i_currently_removed )
542 /* Copy all iovecs in that case */
543 memcpy( &p_input->netlist.p_ts_free[p_input->netlist.i_ts_index]
544 + i_currently_removed,
545 &p_input->netlist.p_ts_free[p_input->netlist.i_ts_index],
546 i_meanwhile_released * sizeof(struct iovec) );
550 /* We have fewer places than items, so we only move
551 i_currently_removed of them. */
552 memcpy( &p_input->netlist.p_ts_free[i_base_index],
553 &p_input->netlist.p_ts_free[p_input->netlist.i_ts_index],
554 i_currently_removed * sizeof(struct iovec) );
557 /* Update i_netlist_index with the information gathered above. */
558 p_input->netlist.i_ts_index += i_currently_removed;
562 /* Nothing happened. */
563 p_input->netlist.i_ts_index = i_current_index;
566 vlc_mutex_unlock( &p_input->netlist.lock );
568 #else /* FIFO netlist */
569 /* & is modulo ; that's where we make the loop. */
570 p_input->netlist.i_ts_start = i_current_index & INPUT_MAX_TS;
574 p_input->c_packets_read += i_current_index - i_base_index;
575 p_input->c_bytes += (i_current_index - i_base_index) * TS_PACKET_SIZE;
580 /*******************************************************************************
581 * input_SortPacket: find out whether we need that packet
582 *******************************************************************************/
583 static __inline__ void input_SortPacket( input_thread_t *p_input,
584 ts_packet_t *p_ts_packet )
589 /* Verify that sync_byte, error_indicator and scrambling_control are
591 if( !(p_ts_packet->buffer[0] == 0x47) || (p_ts_packet->buffer[1] & 0x80) ||
592 (p_ts_packet->buffer[3] & 0xc0) )
594 intf_DbgMsg("input debug: invalid TS header (%p)\n", p_ts_packet);
598 /* Get the PID of the packet. Note that ntohs is needed, for endianness
599 purposes (see man page). */
600 i_current_pid = U16_AT(&p_ts_packet->buffer[1]) & 0x1fff;
602 // intf_DbgMsg("input debug: pid %d received (%p)\n",
603 // i_current_pid, p_ts_packet);
605 /* Lock current ES state. */
606 vlc_mutex_lock( &p_input->es_lock );
608 /* Verify that we actually want this PID. */
609 for( i_es_loop = 0; i_es_loop < INPUT_MAX_SELECTED_ES; i_es_loop++ )
611 if( p_input->pp_selected_es[i_es_loop] != NULL)
613 if( (*p_input->pp_selected_es[i_es_loop]).i_id
616 /* Don't need the lock anymore, since the value pointed
617 out by p_input->pp_selected_es[i_es_loop] can only be
618 modified from inside the input_thread (by the PSI
619 decoder): interface thread is only allowed to modify
620 the pp_selected_es table */
621 vlc_mutex_unlock( &p_input->es_lock );
623 /* We're interested. Pass it to the demultiplexer. */
624 input_DemuxTS( p_input, p_ts_packet,
625 p_input->pp_selected_es[i_es_loop] );
631 /* pp_selected_es should not contain any hole. */
635 vlc_mutex_unlock( &p_input->es_lock );
638 /* We weren't interested in receiving this packet. Give it back to the
640 // intf_DbgMsg("SortPacket: freeing unwanted TS %p (pid %d)\n", p_ts_packet,
641 // U16_AT(&p_ts_packet->buffer[1]) & 0x1fff);
642 input_NetlistFreeTS( p_input, p_ts_packet );
644 p_input->c_packets_trashed++;
648 /*******************************************************************************
649 * input_DemuxTS: first step of demultiplexing: the TS header
650 *******************************************************************************
651 * Stream must also only contain PES and PSI, so PID must have been filtered
652 *******************************************************************************/
653 static __inline__ void input_DemuxTS( input_thread_t *p_input,
654 ts_packet_t *p_ts_packet,
655 es_descriptor_t *p_es_descriptor )
658 boolean_t b_adaption; /* Adaption field is present */
659 boolean_t b_payload; /* Packet carries payload */
660 boolean_t b_unit_start; /* A PSI or a PES start in the packet */
661 boolean_t b_trash = 0; /* Must the packet be trashed ? */
662 boolean_t b_lost = 0; /* Was there a packet lost ? */
666 ASSERT(p_es_descriptor);
668 #define p (p_ts_packet->buffer)
670 // intf_DbgMsg("input debug: TS-demultiplexing packet %p, pid %d, number %d\n",
671 // p_ts_packet, U16_AT(&p[1]) & 0x1fff, p[3] & 0x0f);
674 p_es_descriptor->c_packets++;
675 p_es_descriptor->c_bytes += TS_PACKET_SIZE;
678 /* Extract flags values from TS common header. */
679 b_unit_start = (p[1] & 0x40);
680 b_adaption = (p[3] & 0x20);
681 b_payload = (p[3] & 0x10);
683 /* Extract adaption field informations if any */
686 /* We don't have any adaptation_field, so payload start immediately
687 after the 4 byte TS header */
688 p_ts_packet->i_payload_start = 4;
692 /* p[4] is adaptation_field_length minus one */
693 p_ts_packet->i_payload_start = 5 + p[4];
695 /* The adaption field can be limited to the adaptation_field_length byte,
696 so that there is nothing to do: skip this possibility */
699 /* If the packet has both adaptation_field and payload, adaptation_field
700 cannot be more than 182 bytes long; if there is only an
701 adaptation_field, it must fill the next 183 bytes. */
702 if( b_payload ? (p[4] > 182) : (p[4] != 183) )
704 intf_DbgMsg("input debug: invalid TS adaptation field (%p)\n",
707 p_es_descriptor->c_invalid_packets++;
712 /* No we are sure that the byte containing flags is present: read it */
715 /* discontinuity_indicator */
718 intf_DbgMsg("discontinuity_indicator encountered by TS demux " \
719 "(position read: %d, saved: %d)\n", p[5] & 0x80,
720 p_es_descriptor->i_continuity_counter);
722 /* If the PID carries the PCR, there will be a system time-base
723 discontinuity. We let the PCR decoder handle that. */
724 p_es_descriptor->b_discontinuity = 1;
726 /* There also may be a continuity_counter discontinuity:
727 resynchronise our counter with the one of the stream */
728 p_es_descriptor->i_continuity_counter = (p[3] & 0x0f) - 1;
731 /* random_access_indicator */
732 p_es_descriptor->b_random |= p[5] & 0x40;
734 /* If this is a PCR_PID, and this TS packet contains a PCR,
735 we pass it along to the PCR decoder. */
736 if( (p_es_descriptor->b_pcr) && (p[5] & 0x10) )
738 /* There should be a PCR field in the packet, check if the
739 adaption field is long enough to carry it */
742 /* Call the PCR decoder */
743 input_PcrDecode( p_input, p_es_descriptor, &p[6] );
750 /* Check the continuity of the stream. */
751 i_dummy = ((p[3] & 0x0f) - p_es_descriptor->i_continuity_counter) & 0x0f;
754 /* Everything is ok, just increase our counter */
755 p_es_descriptor->i_continuity_counter++;
759 if( !b_payload && i_dummy == 0 )
761 /* This is a packet without payload, this is allowed by the draft
762 As there is nothing interessant in this packet (except PCR that
763 have already been handled), we can trash the packet. */
764 intf_DbgMsg("Packet without payload received by TS demux\n");
767 else if( i_dummy <= 0 )
769 /* Duplicate packet: mark it as being to be trashed. */
770 intf_DbgMsg("Duplicate packet received by TS demux\n");
773 else if( p_es_descriptor->i_continuity_counter == 0xFF )
775 /* This means that the packet is the first one we receive for this
776 ES since the continuity counter ranges between 0 and 0x0F
777 excepts when it has been initialized by the input: Init the
778 counter to the correct value. */
779 intf_DbgMsg("First packet for PID %d received by TS demux\n",
780 p_es_descriptor->i_id);
781 p_es_descriptor->i_continuity_counter = (p[3] & 0x0f);
785 /* This can indicate that we missed a packet or that the
786 continuity_counter wrapped and we received a dup packet: as we
787 don't know, do as if we missed a packet to be sure to recover
788 from this situation */
789 intf_DbgMsg("Packet lost by TS demux: current %d, packet %d\n",
790 p_es_descriptor->i_continuity_counter & 0x0f,
793 p_es_descriptor->i_continuity_counter = p[3] & 0x0f;
797 /* Trash the packet if it has no payload or if it is bad */
800 input_NetlistFreeTS( p_input, p_ts_packet );
802 p_input->c_packets_trashed++;
807 if( p_es_descriptor->b_psi )
809 /* The payload contains PSI tables */
810 input_DemuxPSI( p_input, p_ts_packet, p_es_descriptor,
811 b_unit_start, b_lost );
815 /* The payload carries a PES stream */
816 input_DemuxPES( p_input, p_ts_packet, p_es_descriptor,
817 b_unit_start, b_lost );
827 /*******************************************************************************
829 *******************************************************************************
830 * Gather a PES packet and analyzes its header.
831 *******************************************************************************/
832 static __inline__ void input_DemuxPES( input_thread_t *p_input,
833 ts_packet_t *p_ts_packet,
834 es_descriptor_t *p_es_descriptor,
835 boolean_t b_unit_start,
836 boolean_t b_packet_lost )
838 decoder_fifo_t * p_fifo;
839 u8 i_pes_header_size;
841 pes_packet_t* p_last_pes;
843 int i_ts_payload_size;
846 #define p_pes (p_es_descriptor->p_pes_packet)
850 ASSERT(p_es_descriptor);
852 // intf_DbgMsg("PES-demultiplexing %p (%p)\n", p_ts_packet, p_pes);
854 /* If we lost data, discard the PES packet we are trying to reassemble
855 if any and wait for the beginning of a new one in order to synchronise
857 if( b_packet_lost && p_pes != NULL )
859 intf_DbgMsg("PES %p trashed because of packet lost\n", p_pes);
860 input_NetlistFreePES( p_input, p_pes );
864 /* If the TS packet contains the begining of a new PES packet, and if we
865 were reassembling a PES packet, then the PES should be complete now,
866 so parse its header and give it to the decoders */
867 if( b_unit_start && p_pes != NULL )
869 // intf_DbgMsg("End of PES packet %p\n", p_pes);
871 /* Parse the header. The header has a variable length, but in order
872 to improve the algorithm, we will read the 14 bytes we may be
874 p_ts = p_pes->p_first_ts;
875 i_ts_payload_size = p_ts->i_payload_end - p_ts->i_payload_start;
878 if(i_ts_payload_size >= PES_HEADER_SIZE)
880 /* This part of the header entirely fits in the payload of
881 the first TS packet */
882 p_pes->p_pes_header = &(p_ts->buffer[p_ts->i_payload_start]);
886 /* This part of the header does not fit in the current TS packet:
887 copy the part of the header we are interested in to the
888 p_pes_header_save buffer. The buffer is dynamicly allocated if
889 needed so it's time expensive but this situation almost never
891 intf_DbgMsg("Code never tested encountered, WARNING ! (benny)\n");
892 if( !p_pes->p_pes_header_save )
893 p_pes->p_pes_header_save = malloc(PES_HEADER_SIZE);
897 memcpy(p_pes->p_pes_header_save + i_dummy,
898 &p_ts->buffer[p_ts->i_payload_start], i_ts_payload_size);
899 i_dummy += i_ts_payload_size;
901 p_ts = p_ts->p_next_ts;
904 /* The payload of the PES packet is shorter than the 14 bytes
905 we would read. This means that high packet lost occured
906 so the PES won't be usefull for any decoder. Moreover,
907 this should never happen so we can trash the packet and
908 exit roughly without regrets */
909 intf_DbgMsg("PES packet too short: trashed\n");
910 input_NetlistFreePES( p_input, p_pes );
916 i_ts_payload_size = p_ts->i_payload_end - p_ts->i_payload_start;
918 while(i_ts_payload_size + i_dummy < PES_HEADER_SIZE);
920 /* This last TS packet is partly header, partly payload, so just
921 copy the header part */
922 memcpy(p_pes->p_pes_header_save + i_dummy,
923 &p_ts->buffer[p_ts->i_payload_start],
924 PES_HEADER_SIZE - i_dummy);
926 /* The header must be read in the buffer not in any TS packet */
927 p_pes->p_pes_header = p_pes->p_pes_header_save;
930 /* Now we have the part of the PES header we were interested in:
933 /* First read the 6 header bytes common to all PES packets:
934 use them to test the PES validity */
935 if( (p_pes->p_pes_header[0] || p_pes->p_pes_header[1] ||
936 (p_pes->p_pes_header[2] != 1)) ||
937 /* packet_start_code_prefix != 0x000001 */
938 ((i_dummy = U16_AT(p_pes->p_pes_header + 4)) &&
939 (i_dummy + 6 != p_pes->i_pes_size)) )
940 /* PES_packet_length is set and != total received payload */
942 /* Trash the packet and set p_pes to NULL to be sure the next PES
943 packet will have its b_data_lost flag set */
944 intf_DbgMsg("Corrupted PES packet received: trashed\n");
945 input_NetlistFreePES( p_input, p_pes );
951 /* The PES packet is valid. Check its type to test if it may
952 carry additional informations in a header extension */
953 p_pes->i_stream_id = p_pes->p_pes_header[3];
955 switch( p_pes->i_stream_id )
957 case 0xBE: /* Padding */
958 case 0xBC: /* Program stream map */
959 case 0xBF: /* Private stream 2 */
962 case 0xFF: /* Program stream directory */
963 case 0xF2: /* DSMCC stream */
964 case 0xF8: /* ITU-T H.222.1 type E stream */
965 /* The payload begins immediatly after the 6 bytes header, so
966 we have finished with the parsing */
967 i_pes_header_size = 6;
971 /* The PES header contains at least 3 more bytes: parse them */
972 p_pes->b_data_alignment = p_pes->p_pes_header[6] & 0x04;
973 p_pes->b_has_pts = p_pes->p_pes_header[7] & 0x80;
974 i_pes_header_size = p_pes->p_pes_header[8] + 9;
976 /* Now parse the optional header extensions (in the limit of
978 if( p_pes->b_has_pts )
980 pcr_descriptor_t * p_pcr;
982 p_pcr = p_input->p_pcr;
985 ( ((mtime_t)(p_pes->p_pes_header[9] & 0x0E) << 29) |
986 (((mtime_t)U16_AT(p_pes->p_pes_header + 10) << 14) - (1 << 14)) |
987 ((mtime_t)U16_AT(p_pes->p_pes_header + 12) >> 1) ) * 300;
990 if( p_pcr->i_synchro_state )
992 switch( p_pcr->i_synchro_state )
994 case SYNCHRO_NOT_STARTED:
995 p_pes->b_has_pts = 0;
999 p_pes->i_pts += p_pcr->delta_pcr;
1000 p_pcr->delta_absolute = mdate() - p_pes->i_pts + 500000;
1001 p_pes->i_pts += p_pcr->delta_absolute;
1002 p_pcr->i_synchro_state = 0;
1005 case SYNCHRO_REINIT: /* We skip a PES */
1006 p_pes->b_has_pts = 0;
1007 p_pcr->i_synchro_state = SYNCHRO_START;
1013 p_pes->i_pts += p_pcr->delta_pcr + p_pcr->delta_absolute;
1019 /* Now we've parsed the header, we just have to indicate in some
1020 specific TS packets where the PES payload begins (renumber
1021 i_payload_start), so that the decoders can find the beginning
1022 of their data right out of the box. */
1023 p_ts = p_pes->p_first_ts;
1024 i_ts_payload_size = p_ts->i_payload_end - p_ts->i_payload_start;
1025 while( i_pes_header_size > i_ts_payload_size )
1027 /* These packets are entirely filled by the PES header. */
1028 i_pes_header_size -= i_ts_payload_size;
1029 p_ts->i_payload_start = p_ts->i_payload_end;
1030 /* Go to the next TS packet: here we won't have to test it is
1031 not NULL because we trash the PES packets when packet lost
1033 p_ts = p_ts->p_next_ts;
1034 i_ts_payload_size = p_ts->i_payload_end - p_ts->i_payload_start;
1036 /* This last packet is partly header, partly payload. */
1037 p_ts->i_payload_start += i_pes_header_size;
1040 /* Now we can eventually put the PES packet in the decoder's
1042 switch( p_es_descriptor->i_type )
1044 case MPEG1_VIDEO_ES:
1045 case MPEG2_VIDEO_ES:
1047 p_fifo = &(((vdec_thread_t*)(p_es_descriptor->p_dec))->fifo);
1049 p_fifo = &(((vpar_thread_t*)(p_es_descriptor->p_dec))->fifo);
1053 case MPEG1_AUDIO_ES:
1054 case MPEG2_AUDIO_ES:
1055 p_fifo = &(((adec_thread_t*)(p_es_descriptor->p_dec))->fifo);
1059 /* we skip 4 bytes at the beginning of the AC3 payload */
1060 p_ts->i_payload_start += 4;
1061 p_fifo = &(((ac3dec_thread_t *)(p_es_descriptor->p_dec))->fifo);
1065 /* This should never happen */
1066 intf_DbgMsg("Unknown stream type (%d, %d): PES trashed\n",
1067 p_es_descriptor->i_id, p_es_descriptor->i_type);
1072 if( p_fifo != NULL )
1074 vlc_mutex_lock( &p_fifo->data_lock );
1075 if( DECODER_FIFO_ISFULL( *p_fifo ) )
1077 /* The FIFO is full !!! This should not happen. */
1079 p_input->c_packets_trashed += p_pes->i_ts_packets;
1080 p_es_descriptor->c_invalid_packets += p_pes->i_ts_packets;
1082 input_NetlistFreePES( p_input, p_pes );
1083 intf_DbgMsg("PES trashed - fifo full ! (%d, %d)\n",
1084 p_es_descriptor->i_id, p_es_descriptor->i_type);
1088 // intf_DbgMsg("Putting %p into fifo %p/%d\n",
1089 // p_pes, p_fifo, p_fifo->i_end);
1090 p_fifo->buffer[p_fifo->i_end] = p_pes;
1091 DECODER_FIFO_INCEND( *p_fifo );
1093 /* Warn the decoder that it's got work to do. */
1094 vlc_cond_signal( &p_fifo->data_wait );
1096 vlc_mutex_unlock( &p_fifo->data_lock );
1100 intf_DbgMsg("No fifo to receive PES %p: trash\n", p_pes);
1102 p_input->c_packets_trashed += p_pes->i_ts_packets;
1103 p_es_descriptor->c_invalid_packets += p_pes->i_ts_packets;
1105 input_NetlistFreePES( p_input, p_pes );
1111 /* If we are at the beginning of a new PES packet, we must fetch a new
1112 PES buffer to begin with the reassembly of this PES packet. This is
1113 also here that we can synchronise with the stream if we we lost
1114 packets or if the decoder has just started */
1119 /* Get a new one PES from the PES netlist. */
1120 if( (p_pes = input_NetlistGetPES( p_input )) == (NULL) )
1122 /* PES netlist is empty ! */
1123 p_input->b_error = 1;
1127 // intf_DbgMsg("New PES packet %p (first TS: %p)\n", p_pes, p_ts_packet);
1129 /* Init the PES fields so that the first TS packet could be correctly
1130 added to the PES packet (see below) */
1131 p_pes->p_first_ts = p_ts_packet;
1132 p_pes->p_last_ts = NULL;
1134 /* If the last pes packet was null, this means that the synchronisation
1135 was lost and so warn the decoder that he will have to find a way to
1138 p_pes->b_data_loss = 1;
1140 /* Read the b_random_access flag status and then reinit it */
1141 p_pes->b_random_access = p_es_descriptor->b_random;
1142 p_es_descriptor->b_random = 0;
1147 /* If we are synchronised with the stream, and so if we are ready to
1148 receive correctly the data, add the TS packet to the current PES
1152 // intf_DbgMsg("Adding TS %p to PES %p\n", p_ts_packet, p_pes);
1154 /* Size of the payload carried in the TS packet */
1155 i_ts_payload_size = p_ts_packet->i_payload_end -
1156 p_ts_packet->i_payload_start;
1158 /* Update the relations between the TS packets */
1159 p_ts_packet->p_prev_ts = p_pes->p_last_ts;
1160 p_ts_packet->p_next_ts = NULL;
1161 if( p_pes->i_ts_packets != 0 )
1163 /* Regarder si il serait pas plus efficace de ne creer que les liens
1164 precedent->suivant pour le moment, et les liens suivant->precedent
1165 quand le paquet est termine */
1166 /* Otherwise it is the first TS packet. */
1167 p_pes->p_last_ts->p_next_ts = p_ts_packet;
1169 /* Now add the TS to the PES packet */
1170 p_pes->p_last_ts = p_ts_packet;
1171 p_pes->i_ts_packets++;
1172 p_pes->i_pes_size += i_ts_payload_size;
1176 i_dummy = p_ts_packet->i_payload_end - p_ts_packet->i_payload_start;
1177 p_es_descriptor->c_payload_bytes += i_dummy;
1182 /* Since we don't use the TS packet to build a PES packet, we don't
1183 need it anymore, so give it back to the netlist */
1184 // intf_DbgMsg("Trashing TS %p: no PES being build\n", p_ts_packet);
1185 input_NetlistFreeTS( p_input, p_ts_packet );
1194 /*******************************************************************************
1196 *******************************************************************************
1197 * Notice that current ES state has been locked by input_SortPacket. (No more true,
1198 * changed by benny - See if it's ok, and definitely change the code ???????? )
1199 *******************************************************************************/
1200 static __inline__ void input_DemuxPSI( input_thread_t *p_input,
1201 ts_packet_t *p_ts_packet,
1202 es_descriptor_t *p_es_descriptor,
1203 boolean_t b_unit_start, boolean_t b_packet_lost )
1205 int i_data_offset; /* Offset of the interesting data in the TS packet */
1206 u16 i_data_length; /* Length of those data */
1207 //boolean_t b_first_section; /* Was there another section in the TS packet ? */
1210 ASSERT(p_ts_packet);
1211 ASSERT(p_es_descriptor);
1213 #define p_psi (p_es_descriptor->p_psi_section)
1215 // intf_DbgMsg( "input debug: PSI demultiplexing %p (%p)\n", p_ts_packet, p_input);
1217 // intf_DbgMsg( "Packet: %x %x %x %x %x %x %x %x %x %x %x %x %x %x %x %x %x %x %x %x %x (unit start: %d)\n", p_ts_packet->buffer[p_ts_packet->i_payload_start], p_ts_packet->buffer[p_ts_packet->i_payload_start+1], p_ts_packet->buffer[p_ts_packet->i_payload_start+2], p_ts_packet->buffer[p_ts_packet->i_payload_start+3], p_ts_packet->buffer[p_ts_packet->i_payload_start+4], p_ts_packet->buffer[p_ts_packet->i_payload_start+5], p_ts_packet->buffer[p_ts_packet->i_payload_start+6], p_ts_packet->buffer[p_ts_packet->i_payload_start+7], p_ts_packet->buffer[p_ts_packet->i_payload_start+8], p_ts_packet->buffer[p_ts_packet->i_payload_start+9], p_ts_packet->buffer[p_ts_packet->i_payload_start+10], p_ts_packet->buffer[p_ts_packet->i_payload_start+11], p_ts_packet->buffer[p_ts_packet->i_payload_start+12], p_ts_packet->buffer[p_ts_packet->i_payload_start+13], p_ts_packet->buffer[p_ts_packet->i_payload_start+14], p_ts_packet->buffer[p_ts_packet->i_payload_start+15], p_ts_packet->buffer[p_ts_packet->i_payload_start+16], p_ts_packet->buffer[p_ts_packet->i_payload_start+17], p_ts_packet->buffer[p_ts_packet->i_payload_start+18], p_ts_packet->buffer[p_ts_packet->i_payload_start+19], p_ts_packet->buffer[p_ts_packet->i_payload_start+20], b_unit_start);
1220 /* Try to find the beginning of the payload in the packet to initialise
1221 the do-while loop that follows -> Compute the i_data_offset variable:
1222 by default, the value is set so that we won't enter in the while loop.
1223 It will be set to a correct value if the data are not corrupted */
1224 i_data_offset = TS_PACKET_SIZE;
1226 /* Has the reassembly of a section already began in a previous packet ? */
1227 if( p_psi->b_running_section )
1229 /* Was data lost since the last TS packet ? */
1232 /* Discard the packet and wait for the begining of a new one to resynch */
1233 p_psi->b_running_section = 0;
1234 p_psi->i_current_position = 0;
1235 intf_DbgMsg( "PSI section(s) discarded due to packet loss\n" );
1239 /* The data that complete a previously began section are always at
1240 the beginning of the TS payload... */
1241 i_data_offset = p_ts_packet->i_payload_start;
1242 /* ...Unless there is a pointer field, that we have to bypass */
1245 // intf_DbgMsg( "New part of the section received at offset %d\n", i_data_offset );
1248 /* We are looking for the beginning of a new section */
1253 /* Get the offset at which the data for that section can be found
1254 The offset is stored in the pointer_field since we are interested in
1255 the first section of the TS packet. Note that the +1 is to bypass
1256 the pointer field */
1257 i_data_offset = p_ts_packet->i_payload_start +
1258 p_ts_packet->buffer[p_ts_packet->i_payload_start] + 1;
1259 // intf_DbgMsg( "New section beginning at offset %d in TS packet\n", i_data_offset );
1263 /* This may either mean that the TS is bad or that the packet contains
1264 the end of a section that had been discarded in a previous loop:
1265 trash the TS packet since we cannot do anything with those data: */
1266 p_psi->b_running_section = 0;
1267 p_psi->i_current_position = 0;
1268 intf_DbgMsg( "PSI packet discarded due to lack of synchronisation\n" );
1272 /* The section we will deal with during the first iteration of the following
1273 loop is the first one contained in the TS packet */
1274 // b_first_section = 1;
1276 /* Reassemble the pieces of sections contained in the TS packet and decode
1277 the sections that could have been completed.
1278 Stop when we reach the end of the packet or stuffing bytes */
1279 while( i_data_offset < TS_PACKET_SIZE && p_ts_packet->buffer[i_data_offset] != 0xFF )
1281 /* If the current section is a new one, reinit the data fields of the p_psi
1282 struct to start its decoding */
1283 if( !p_psi->b_running_section )
1285 /* Read the length of the new section */
1286 p_psi->i_length = (U16_AT(&p_ts_packet->buffer[i_data_offset+1]) & 0xFFF) + 3;
1287 // intf_DbgMsg( "Section length %d\n", p_psi->i_length );
1288 if( p_psi->i_length > PSI_SECTION_SIZE )
1290 /* The TS packet is corrupted, stop here to avoid possible a seg fault */
1291 intf_DbgMsg( "PSI Section size is too big, aborting its reception\n" );
1295 /* Init the reassembly of that section */
1296 p_psi->b_running_section = 1;
1297 p_psi->i_current_position = 0;
1300 /* Compute the length of data related to the section in this TS packet */
1301 if( p_psi->i_length - p_psi->i_current_position > TS_PACKET_SIZE - i_data_offset)
1302 i_data_length = TS_PACKET_SIZE - i_data_offset;
1304 i_data_length = p_psi->i_length - p_psi->i_current_position;
1306 /* Copy those data in the section buffer */
1307 memcpy( &p_psi->buffer[p_psi->i_current_position], &p_ts_packet->buffer[i_data_offset],
1310 /* Interesting data are now after the ones we copied, since no gap is
1311 allowed between 2 sections in a TS packets */
1312 i_data_offset += i_data_length;
1314 /* Decode the packet if it is now complete */
1315 if (p_psi->i_length == p_psi->i_current_position + i_data_length)
1317 /* Packet is complete, decode it */
1318 // intf_DbgMsg( "SECTION COMPLETE: starting decoding of its data\n" );
1319 input_PsiDecode( p_input, p_psi );
1321 /* Prepare the buffer to receive a new section */
1322 p_psi->i_current_position = 0;
1323 p_psi->b_running_section = 0;
1325 /* The new section won't be the first anymore */
1326 //b_first_section = 0;
1330 /* Prepare the buffer to receive the next part of the section */
1331 p_psi->i_current_position += i_data_length;
1332 // intf_DbgMsg( "Section not complete, waiting for the end\n" );
1335 // intf_DbgMsg( "Must loop ? Next data offset: %d, stuffing: %d\n",
1336 // i_data_offset, p_ts_packet->buffer[i_data_offset] );
1339 /* Relase the TS packet, we don't need it anymore */
1340 input_NetlistFreeTS( p_input, p_ts_packet );