1 /*******************************************************************************
2 * input.c: input thread
4 *******************************************************************************
5 * Read an MPEG2 stream, demultiplex and parse it before sending it to
7 *******************************************************************************/
9 /*******************************************************************************
11 *******************************************************************************/
14 #include <sys/uio.h> /* iovec */
18 #include <X11/extensions/XShm.h>
19 #include <sys/soundcard.h>
21 #include <stdlib.h> /* atoi(), malloc(), free() */
23 #include <sys/ioctl.h> /* ioctl() */
24 #include <net/if.h> /* ifreq */
25 #include <netinet/in.h>
34 #include "input_psi.h"
35 #include "input_pcr.h"
36 #include "input_netlist.h"
37 #include "decoder_fifo.h"
38 #include "input_file.h"
39 #include "input_network.h"
41 #include "audio_output.h"
42 #include "audio_decoder.h"
45 #include "video_output.h"
46 #include "video_decoder.h"
48 /******************************************************************************
50 ******************************************************************************/
51 static void input_Thread( input_thread_t *p_input );
52 static __inline__ int input_ReadPacket( input_thread_t *p_input );
53 static __inline__ void input_SortPacket( input_thread_t *p_input,
54 ts_packet_t *ts_packet );
55 static __inline__ void input_DemuxTS( input_thread_t *p_input,
56 ts_packet_t *ts_packet,
57 es_descriptor_t *es_descriptor );
58 static __inline__ void input_DemuxPES( input_thread_t *p_input,
59 ts_packet_t *ts_packet,
60 es_descriptor_t *p_es_descriptor,
61 boolean_t b_unit_start, boolean_t b_packet_lost );
62 static __inline__ void input_DemuxPSI( input_thread_t *p_input,
63 ts_packet_t *ts_packet,
64 es_descriptor_t *p_es_descriptor,
65 boolean_t b_unit_start, boolean_t b_packet_lost );
67 /*******************************************************************************
68 * input_CreateThread: initialize and spawn an input thread
69 *******************************************************************************
70 * This function initializes and spawns an input thread. It returns NULL on
71 * failure. If you want a better understanding of the input thread, don't start
72 * by reading this function :-).
73 *******************************************************************************/
74 input_thread_t *input_CreateThread( input_cfg_t *p_cfg )
76 input_thread_t * p_input;
79 intf_DbgMsg("input debug 1-1: creating thread (cfg : %p)\n", p_cfg );
81 /* Allocate input_thread_t structure. */
82 if( !( p_input = (input_thread_t *)malloc(sizeof(input_thread_t)) ) )
84 intf_ErrMsg("input error: can't allocate input thread structure (%s)\n",
89 bzero( p_input, sizeof(input_thread_t));
90 for( i_index = 0; i_index < INPUT_MAX_ES; i_index++ )
92 p_input->p_es[i_index].i_id = EMPTY_PID;
95 /* Find out which method we are gonna use and retrieve pointers. */
96 if( !((p_cfg->i_properties) & INPUT_CFG_METHOD) )
98 /* i_method is not set. */
99 intf_DbgMsg("input debug: using default method (%d)\n",
100 INPUT_DEFAULT_METHOD);
101 p_cfg->i_method = INPUT_DEFAULT_METHOD;
102 p_cfg->i_properties |= INPUT_CFG_METHOD;
104 p_input->i_method = p_cfg->i_method;
105 switch( p_cfg->i_method )
108 case INPUT_METHOD_TS_FILE:
109 p_input->p_open = &input_FileCreateMethod;
110 p_input->p_read = &input_FileRead;
111 p_input->p_clean = &input_FileDestroyMethod;
114 /* Network methods */
115 case INPUT_METHOD_TS_UCAST:
116 case INPUT_METHOD_TS_MCAST:
117 case INPUT_METHOD_TS_BCAST:
118 case INPUT_METHOD_TS_VLAN_BCAST:
119 p_input->p_open = &input_NetworkCreateMethod;
120 p_input->p_read = &input_NetworkRead;
121 p_input->p_clean = &input_NetworkDestroyMethod;
124 case INPUT_METHOD_NONE:
127 /* Internal error, which should never happen */
128 intf_DbgMsg("input debug: unknow method type %d\n",
135 /* Initialize PSI decoder. */
136 intf_DbgMsg("Initializing PSI decoder\n");
137 if( input_PsiInit( p_input ) == -1 )
143 /* Initialize PCR decoder. */
144 intf_DbgMsg("Initializing PCR decoder\n");
145 if( input_PcrInit( p_input ) == -1 )
147 input_PsiClean( p_input );
152 /* Initialize netlists. */
153 if( input_NetlistOpen( p_input ) )
155 input_PsiClean( p_input );
156 input_PcrClean( p_input );
162 /* Initialize counters. */
163 p_input->c_bytes = 0;
164 p_input->c_payload_bytes = 0;
165 p_input->c_ts_packets_read = 0;
166 p_input->c_ts_packets_trashed = 0;
168 p_input->c_loops = 0;
172 /* Let the appropriate method open the socket. */
173 if( (*(p_input->p_open))( p_input, p_cfg ) == -1 )
175 input_NetlistClean( p_input );
176 input_PsiClean( p_input );
177 input_PcrClean( p_input );
182 intf_DbgMsg("input debug: method %d properly initialized the socket\n",
185 /* Create thread and set locks. */
187 pthread_mutex_init( &p_input->netlist.lock, NULL );
188 pthread_mutex_init( &p_input->programs_lock, NULL );
189 pthread_mutex_init( &p_input->es_lock, NULL );
191 input_Thread( p_input );
193 if( pthread_create(&p_input->thread_id, NULL, (void *) input_Thread,
196 intf_ErrMsg("input error: can't spawn input thread (%s)\n",
198 (*p_input->p_clean)( p_input );
199 input_NetlistClean( p_input );;
200 input_PsiClean( p_input );
201 input_PcrClean( p_input );
207 /* Default setting for new decoders */
208 p_input->p_aout = p_cfg->p_aout;
213 /******************************************************************************
214 * input_DestroyThread: mark an input thread as zombie
215 ******************************************************************************
216 * This function should not return until the thread is effectively cancelled.
217 ******************************************************************************/
218 void input_DestroyThread( input_thread_t *p_input )
222 intf_DbgMsg("input debug: requesting termination of input thread\n");
223 p_input->b_die = 1; /* ask thread to kill itself */
224 pthread_join( p_input->thread_id, NULL ); /* wait until it's done */
226 (*p_input->p_clean)( p_input ); /* close input method */
228 /* Destroy all decoder threads. */
229 for( i_es_loop = 0; i_es_loop < INPUT_MAX_ES; i_es_loop++ )
231 if( p_input->pp_selected_es[i_es_loop] )
233 switch( p_input->pp_selected_es[i_es_loop]->i_type )
237 vdec_DestroyThread( (vdec_thread_t*)(p_input->pp_selected_es[i_es_loop]->p_dec), NULL );
241 adec_DestroyThread( (adec_thread_t*)(p_input->pp_selected_es[i_es_loop]->p_dec) );
245 /* This should never happen. */
246 intf_DbgMsg("input debug: unknown stream type ! (%d, %d)\n",
247 p_input->pp_selected_es[i_es_loop]->i_id,
248 p_input->pp_selected_es[i_es_loop]->i_type);
255 /* pp_selected_es should not contain any hole. */
260 input_NetlistClean( p_input ); /* clean netlist */
261 input_PsiClean( p_input ); /* clean PSI information */
262 input_PcrClean( p_input ); /* clean PCR information */
263 free( p_input ); /* free input_thread structure */
267 /*******************************************************************************
268 * input_OpenAudioStream: open an audio stream
269 *******************************************************************************
270 * This function spawns an audio decoder and plugs it on the audio output
272 *******************************************************************************/
273 int input_OpenAudioStream( input_thread_t *p_input, int i_id )
278 /*******************************************************************************
279 * input_CloseAudioStream: close an audio stream
280 *******************************************************************************
281 * This function destroys an audio decoder.
282 *******************************************************************************/
283 void input_CloseAudioStream( input_thread_t *p_input, int i_id )
288 /*******************************************************************************
289 * input_OpenVideoStream: open a video stream
290 *******************************************************************************
291 * This function spawns a video decoder and plugs it on a video output thread.
292 *******************************************************************************/
293 int input_OpenVideoStream( input_thread_t *p_input,
294 struct vout_thread_s *p_vout, struct video_cfg_s * p_cfg )
299 /*******************************************************************************
300 * input_CloseVideoStream: close a video stream
301 *******************************************************************************
302 * This function destroys an video decoder.
303 *******************************************************************************/
304 void input_CloseVideoStream( input_thread_t *p_input, int i_id )
310 /* following functions are local */
312 /*******************************************************************************
313 * input_Thread: input thread
314 *******************************************************************************
315 * Thread in charge of processing the network packets and demultiplexing.
316 *******************************************************************************/
317 static void input_Thread( input_thread_t *p_input )
319 intf_DbgMsg("input debug 11-1: thread %p is active\n", p_input);
320 while( !p_input->b_die )
322 /* Scatter read the UDP packet from the network or the file. */
323 if( (input_ReadPacket( p_input )) == (-1) )
325 /* ??? Normally, a thread can't kill itself, but we don't have
326 * any method in case of an error condition ... */
335 /* Ohoh, we have to die as soon as possible. */
336 intf_DbgMsg("input debug: thread %p destroyed\n", p_input);
340 /*******************************************************************************
341 * input_ReadPacket: reads a packet from the network or the file
342 *******************************************************************************/
343 static __inline__ int input_ReadPacket( input_thread_t *p_input )
345 int i_base_index; /* index of the first free iovec */
348 #ifdef INPUT_LIFO_TS_NETLIST
349 int i_meanwhile_released;
350 int i_currently_removed;
352 ts_packet_t * p_ts_packet;
354 /* In this function, we only care about the TS netlist. PES netlist
355 * is for the demultiplexer. */
356 #ifdef INPUT_LIFO_TS_NETLIST
357 i_base_index = p_input->netlist.i_ts_index;
359 /* Verify that we still have packets in the TS netlist */
360 if( (INPUT_MAX_TS + INPUT_TS_READ_ONCE - 1 - p_input->netlist.i_ts_index) <= INPUT_TS_READ_ONCE )
362 intf_ErrMsg("input error: TS netlist is empty !\n");
366 #else /* FIFO netlist */
367 i_base_index = p_input->netlist.i_ts_start;
368 if( p_input->netlist.i_ts_start + INPUT_TS_READ_ONCE -1 > INPUT_MAX_TS )
370 /* The netlist is splitted in 2 parts. We must gather them to consolidate
371 the FIFO (we make the loop easily in having the same iovec at the far
372 end and in the beginning of netlist_free).
373 That's why the netlist is (INPUT_MAX_TS +1) + (INPUT_TS_READ_ONCE -1)
375 memcpy( p_input->netlist.p_ts_free + INPUT_MAX_TS + 1,
376 p_input->netlist.p_ts_free,
377 (p_input->netlist.i_ts_start + INPUT_TS_READ_ONCE - 1 - INPUT_MAX_TS)
378 * sizeof(struct iovec) );
381 /* Verify that we still have packets in the TS netlist */
382 if( ((p_input->netlist.i_ts_end -1 - p_input->netlist.i_ts_start) & INPUT_MAX_TS) <= INPUT_TS_READ_ONCE )
384 intf_ErrMsg("input error: TS netlist is empty !\n");
387 #endif /* FIFO netlist */
389 /* Scatter read the buffer. */
390 i_packet_size = (*p_input->p_read)( p_input,
391 &p_input->netlist.p_ts_free[i_base_index],
392 INPUT_TS_READ_ONCE );
393 if( i_packet_size == (-1) )
395 intf_DbgMsg("Read packet %d %p %d %d\n", i_base_index,
396 &p_input->netlist.p_ts_free[i_base_index],
397 p_input->netlist.i_ts_start,
398 p_input->netlist.i_ts_end);
399 intf_ErrMsg("input error: readv() failed (%s)\n", strerror(errno));
403 if( i_packet_size == 0 )
405 /* No packet has been received, so stop here. */
409 /* Demultiplex the TS packets (1..INPUT_TS_READ_ONCE) received. */
410 for( i_current_index = i_base_index;
411 (i_packet_size -= TS_PACKET_SIZE) >= 0;
414 /* BTW, something REALLY bad could happen if we receive packets with
416 p_ts_packet = (ts_packet_t*)(p_input->netlist.p_ts_free[i_current_index].iov_base);
417 /* Don't cry :-), we are allowed to do that cast, because initially,
418 our buffer was malloc'ed with sizeof(ts_packet_t) */
420 /* Find out if we need this packet and demultiplex. */
421 input_SortPacket( p_input /* for current PIDs and netlist */,
425 if( i_packet_size > 0 )
427 intf_ErrMsg("input error: wrong size\n");
431 /* Remove the TS packets we have just filled from the netlist */
432 #ifdef INPUT_LIFO_TS_NETLIST
433 /* We need to take a lock here while we're calculating index positions. */
434 pthread_mutex_lock( &p_input->netlist.lock );
436 i_meanwhile_released = i_base_index - p_input->netlist.i_ts_index;
437 if( i_meanwhile_released )
439 /* That's where it becomes funny :-). Since we didn't take locks for
440 efficiency reasons, other threads (including ourselves, with
441 input_DemuxPacket) might have released packets to the netlist.
442 So we have to copy these iovec where they should go.
444 BTW, that explains why the TS netlist is
445 (INPUT_MAX_TS +1) + (TS_READ_ONCE -1) large. */
447 i_currently_removed = i_current_index - i_base_index;
448 if( i_meanwhile_released < i_currently_removed )
450 /* Copy all iovecs in that case */
451 memcpy( &p_input->netlist.p_ts_free[p_input->netlist.i_ts_index]
452 + i_currently_removed,
453 &p_input->netlist.p_ts_free[p_input->netlist.i_ts_index],
454 i_meanwhile_released * sizeof(struct iovec) );
458 /* We have fewer places than items, so we only move
459 i_currently_removed of them. */
460 memcpy( &p_input->netlist.p_ts_free[i_base_index],
461 &p_input->netlist.p_ts_free[p_input->netlist.i_ts_index],
462 i_currently_removed * sizeof(struct iovec) );
465 /* Update i_netlist_index with the information gathered above. */
466 p_input->netlist.i_ts_index += i_currently_removed;
470 /* Nothing happened. */
471 p_input->netlist.i_ts_index = i_current_index;
474 pthread_mutex_unlock( &p_input->netlist.lock );
476 #else /* FIFO netlist */
477 /* & is modulo ; that's where we make the loop. */
478 p_input->netlist.i_ts_start = i_current_index & INPUT_MAX_TS;
482 p_input->c_ts_packets_read += i_current_index - i_base_index;
483 p_input->c_bytes += (i_current_index - i_base_index) * TS_PACKET_SIZE;
488 /*******************************************************************************
489 * input_SortPacket: find out whether we need that packet
490 *******************************************************************************/
491 static __inline__ void input_SortPacket( input_thread_t *p_input,
492 ts_packet_t *p_ts_packet )
497 /* Verify that sync_byte, error_indicator and scrambling_control are
499 if( !(p_ts_packet->buffer[0] == 0x47) || (p_ts_packet->buffer[1] & 0x80) ||
500 (p_ts_packet->buffer[3] & 0xc0) )
502 intf_DbgMsg("input debug: invalid TS header (%p)\n", p_ts_packet);
506 /* Get the PID of the packet. Note that ntohs is needed, for endianness
507 purposes (see man page). */
508 i_current_pid = U16_AT(&p_ts_packet->buffer[1]) & 0x1fff;
510 // intf_DbgMsg("input debug: pid %d received (%p)\n",
511 // i_current_pid, p_ts_packet);
513 /* Lock current ES state. */
514 pthread_mutex_lock( &p_input->es_lock );
516 /* Verify that we actually want this PID. */
517 for( i_es_loop = 0; i_es_loop < INPUT_MAX_SELECTED_ES; i_es_loop++ )
519 if( p_input->pp_selected_es[i_es_loop] != NULL)
521 if( (*p_input->pp_selected_es[i_es_loop]).i_id
524 /* Don't need the lock anymore, since the value pointed
525 out by p_input->pp_selected_es[i_es_loop] can only be
526 modified from inside the input_thread (by the PSI
527 decoder): interface thread is only allowed to modify
528 the pp_selected_es table */
529 pthread_mutex_unlock( &p_input->es_lock );
531 /* We're interested. Pass it to the demultiplexer. */
532 input_DemuxTS( p_input, p_ts_packet,
533 p_input->pp_selected_es[i_es_loop] );
539 /* pp_selected_es should not contain any hole. */
543 pthread_mutex_unlock( &p_input->es_lock );
546 /* We weren't interested in receiving this packet. Give it back to the
548 // intf_DbgMsg("SortPacket: freeing unwanted TS %p (pid %d)\n", p_ts_packet,
549 // U16_AT(&p_ts_packet->buffer[1]) & 0x1fff);
550 input_NetlistFreeTS( p_input, p_ts_packet );
552 p_input->c_ts_packets_trashed++;
556 /*******************************************************************************
557 * input_DemuxTS: first step of demultiplexing: the TS header
558 *******************************************************************************
559 * Stream must also only contain PES and PSI, so PID must have been filtered
560 *******************************************************************************/
561 static __inline__ void input_DemuxTS( input_thread_t *p_input,
562 ts_packet_t *p_ts_packet,
563 es_descriptor_t *p_es_descriptor )
566 boolean_t b_adaption; /* Adaption field is present */
567 boolean_t b_payload; /* Packet carries payload */
568 boolean_t b_unit_start; /* A PSI or a PES start in the packet */
569 boolean_t b_trash = 0; /* Must the packet be trashed ? */
570 boolean_t b_lost = 0; /* Was there a packet lost ? */
574 ASSERT(p_es_descriptor);
576 #define p (p_ts_packet->buffer)
578 // intf_DbgMsg("input debug: TS-demultiplexing packet %p, pid %d, number %d\n",
579 // p_ts_packet, U16_AT(&p[1]) & 0x1fff, p[3] & 0x0f);
582 p_es_descriptor->c_packets++;
583 p_es_descriptor->c_bytes += TS_PACKET_SIZE;
586 /* Extract flags values from TS common header. */
587 b_unit_start = (p[1] & 0x40);
588 b_adaption = (p[3] & 0x20);
589 b_payload = (p[3] & 0x10);
591 /* Extract adaption field informations if any */
594 /* We don't have any adaptation_field, so payload start immediately
595 after the 4 byte TS header */
596 p_ts_packet->i_payload_start = 4;
600 /* p[4] is adaptation_field_length minus one */
601 p_ts_packet->i_payload_start = 5 + p[4];
603 /* The adaption field can be limited to the adaptation_field_length byte,
604 so that there is nothing to do: skip this possibility */
607 /* If the packet has both adaptation_field and payload, adaptation_field
608 cannot be more than 182 bytes long; if there is only an adaptation_field,
609 it must fill the next 183 bytes. */
610 if( b_payload ? (p[4] > 182) : (p[4] != 183) )
612 intf_DbgMsg("input debug: invalid TS adaptation field (%p)\n",
615 p_es_descriptor->c_invalid_packets++;
620 /* No we are sure that the byte containing flags is present: read it */
623 /* discontinuity_indicator */
626 intf_DbgMsg("discontinuity_indicator encountered by TS demux " \
627 "(position read: %d, saved: %d)\n", p[5] & 0x80,
628 p_es_descriptor->i_continuity_counter);
630 /* If the PID carries the PCR, there will be a system time-base
631 discontinuity. We let the PCR decoder handle that. */
632 p_es_descriptor->b_discontinuity = 1;
634 /* There also may be a continuity_counter discontinuity: resynchronise
635 our counter with the one of the stream */
636 p_es_descriptor->i_continuity_counter = (p[3] & 0x0f) - 1;
639 /* random_access_indicator */
640 p_es_descriptor->b_random |= p[5] & 0x40;
642 /* If this is a PCR_PID, and this TS packet contains a PCR, we pass it
643 along to the PCR decoder. */
644 if( (p_es_descriptor->b_pcr) && (p[5] & 0x10) )
646 /* There should be a PCR field in the packet, check if the adaption
647 field is long enough to carry it */
650 /* Call the PCR decoder */
651 input_PcrDecode( p_input, p_es_descriptor, &p[6] );
658 /* Check the continuity of the stream. */
659 i_dummy = ((p[3] & 0x0f) - p_es_descriptor->i_continuity_counter) & 0x0f;
662 /* Everything is ok, just increase our counter */
663 p_es_descriptor->i_continuity_counter++;
667 if( !b_payload && i_dummy == 0 )
669 /* This is a packet without payload, this is allowed by the draft
670 As there is nothing interessant in this packet (except PCR that
671 have already been handled), we can trash the packet. */
672 intf_DbgMsg("Packet without payload received by TS demux\n");
675 else if( i_dummy <= 0 )
677 /* Duplicate packet: mark it as being to be trashed. */
678 intf_DbgMsg("Duplicate packet received by TS demux\n");
683 /* This can indicate that we missed a packet or that the
684 continuity_counter wrapped and we received a dup packet: as we
685 don't know, do as if we missed a packet to be sure to recover
686 from this situation */
687 intf_DbgMsg("Packet lost by TS demux: current %d, packet %d\n",
688 p_es_descriptor->i_continuity_counter & 0x0f,
691 p_es_descriptor->i_continuity_counter = p[3] & 0x0f;
695 /* Trash the packet if it has no payload or if it is bad */
698 input_NetlistFreeTS( p_input, p_ts_packet );
700 p_input->c_ts_packets_trashed++;
705 if( p_es_descriptor->b_psi )
707 /* The payload contains PSI tables */
708 input_DemuxPSI( p_input, p_ts_packet, p_es_descriptor,
709 b_unit_start, b_lost );
713 /* The payload carries a PES stream */
714 input_DemuxPES( p_input, p_ts_packet, p_es_descriptor,
715 b_unit_start, b_lost );
725 /*******************************************************************************
727 *******************************************************************************
728 * Gather a PES packet and analyzes its header.
729 *******************************************************************************/
730 static __inline__ void input_DemuxPES( input_thread_t *p_input,
731 ts_packet_t *p_ts_packet,
732 es_descriptor_t *p_es_descriptor,
733 boolean_t b_unit_start,
734 boolean_t b_packet_lost )
736 decoder_fifo_t * p_fifo;
737 u8 i_pes_header_size;
739 pes_packet_t* p_last_pes;
741 int i_ts_payload_size;
744 #define p_pes (p_es_descriptor->p_pes_packet)
748 ASSERT(p_es_descriptor);
750 // intf_DbgMsg("PES-demultiplexing %p (%p)\n", p_ts_packet, p_pes);
752 /* If we lost data, discard the PES packet we are trying to reassemble
753 if any and wait for the beginning of a new one in order to synchronise
755 if( b_packet_lost && p_pes != NULL )
757 intf_DbgMsg("PES %p trashed because of packet lost\n", p_pes);
758 input_NetlistFreePES( p_input, p_pes );
762 /* If the TS packet contains the begining of a new PES packet, and if we
763 were reassembling a PES packet, then the PES should be complete now,
764 so parse its header and give it to the decoders */
765 if( b_unit_start && p_pes != NULL )
767 // intf_DbgMsg("End of PES packet %p\n", p_pes);
769 /* Parse the header. The header has a variable length, but in order
770 to improve the algorithm, we will read the 14 bytes we may be
772 p_ts = p_pes->p_first_ts;
773 i_ts_payload_size = p_ts->i_payload_end - p_ts->i_payload_start;
776 if(i_ts_payload_size >= PES_HEADER_SIZE)
778 /* This part of the header entirely fits in the payload of
779 the first TS packet */
780 p_pes->p_pes_header = &(p_ts->buffer[p_ts->i_payload_start]);
784 /* This part of the header does not fit in the current TS packet:
785 copy the part of the header we are interested in to the
786 p_pes_header_save buffer */
787 intf_DbgMsg("Code never tested encourtered, WARNING ! (benny)\n");
790 memcpy(p_pes->p_pes_header_save + i_dummy,
791 &p_ts->buffer[p_ts->i_payload_start], i_ts_payload_size);
792 i_dummy += i_ts_payload_size;
794 p_ts = p_ts->p_next_ts;
797 /* The payload of the PES packet is shorter than the 14 bytes
798 we would read. This means that high packet lost occured
799 so the PES won't be usefull for any decoder. Moreover,
800 this should never happen so we can trash the packet and
801 exit roughly without regrets */
802 intf_DbgMsg("PES packet too short: trashed\n");
803 input_NetlistFreePES( p_input, p_pes );
809 i_ts_payload_size = p_ts->i_payload_end - p_ts->i_payload_start;
811 while(i_ts_payload_size + i_dummy < PES_HEADER_SIZE);
813 /* This last TS packet is partly header, partly payload, so just
814 copy the header part */
815 memcpy(p_pes->p_pes_header_save + i_dummy,
816 &p_ts->buffer[p_ts->i_payload_start],
817 PES_HEADER_SIZE - i_dummy);
819 /* The header must be read in the buffer not in any TS packet */
820 p_pes->p_pes_header = p_pes->p_pes_header_save;
823 /* Now we have the part of the PES header we were interested in:
826 /* First read the 6 header bytes common to all PES packets:
827 use them to test the PES validity */
828 if( (p_pes->p_pes_header[0] || p_pes->p_pes_header[1] ||
829 (p_pes->p_pes_header[2] != 1)) ||
830 /* packet_start_code_prefix != 0x000001 */
831 ((i_dummy = U16_AT(p_pes->p_pes_header + 4)) &&
832 (i_dummy + 6 != p_pes->i_pes_size)) )
833 /* PES_packet_length is set and != total received payload */
835 /* Trash the packet and set p_pes to NULL to be sure the next PES
836 packet will have its b_data_lost flag set */
837 intf_DbgMsg("Corrupted PES packet received: trashed\n");
838 input_NetlistFreePES( p_input, p_pes );
844 /* The PES packet is valid. Check its type to test if it may
845 carry additional informations in a header extension */
846 p_pes->i_stream_id = p_pes->p_pes_header[3];
848 switch( p_pes->i_stream_id )
850 case 0xBE: /* Padding */
851 case 0xBC: /* Program stream map */
852 case 0xBF: /* Private stream 2 */
855 case 0xFF: /* Program stream directory */
856 case 0xF2: /* DSMCC stream */
857 case 0xF8: /* ITU-T H.222.1 type E stream */
858 /* The payload begins immediatly after the 6 bytes header, so
859 we have finished with the parsing */
860 i_pes_header_size = 6;
864 /* The PES header contains at least 3 more bytes: parse them */
865 p_pes->b_data_alignment = p_pes->p_pes_header[6] & 0x10;
866 p_pes->b_has_pts = p_pes->p_pes_header[7] & 0x4;
867 i_pes_header_size = 9 + p_pes->p_pes_header[8];
869 /* Now parse the optional header extensions (in the limit of
871 if( p_pes->b_has_pts )
873 /* The PTS field is split in 3 bit records. We have to add
874 them, and thereafter we substract the 2 marker_bits */
875 p_pes->i_pts = ( (p_pes->p_pes_header[9] << 29) +
876 (U16_AT(p_pes->p_pes_header + 10) << 14) +
877 (U16_AT(p_pes->p_pes_header + 12) >> 1) -
878 (1 << 14) - (1 << 29) );
883 /* Now we've parsed the header, we just have to indicate in some
884 specific TS packets where the PES payload begins (renumber
885 i_payload_start), so that the decoders can find the beginning
886 of their data right out of the box. */
887 p_ts = p_pes->p_first_ts;
888 i_ts_payload_size = p_ts->i_payload_end - p_ts->i_payload_start;
889 while( i_pes_header_size > i_ts_payload_size )
891 /* These packets are entirely filled by the PES header. */
892 i_pes_header_size -= i_ts_payload_size;
893 p_ts->i_payload_start = p_ts->i_payload_end;
894 /* Go to the next TS packet: here we won't have to test it is
895 not NULL because we trash the PES packets when packet lost
897 p_ts = p_ts->p_next_ts;
898 i_ts_payload_size = p_ts->i_payload_end - p_ts->i_payload_start;
900 /* This last packet is partly header, partly payload. */
901 p_ts->i_payload_start += i_pes_header_size;
903 /* Now we can eventually put the PES packet in the decoder's
905 switch( p_es_descriptor->i_type )
909 p_fifo = &(((vdec_thread_t*)(p_es_descriptor->p_dec))->fifo);
913 p_fifo = &(((adec_thread_t*)(p_es_descriptor->p_dec))->fifo);
916 /* This should never happen. */
917 intf_DbgMsg("Unknown stream type (%d, %d): PES trashed\n",
918 p_es_descriptor->i_id, p_es_descriptor->i_type);
925 pthread_mutex_lock( &p_fifo->data_lock );
926 if( DECODER_FIFO_ISFULL( *p_fifo ) )
928 /* The FIFO is full !!! This should not happen. */
930 p_input->c_ts_packets_trashed += p_pes->i_ts_packets;
931 p_es_descriptor->c_invalid_packets += p_pes->i_ts_packets;
933 input_NetlistFreePES( p_input, p_pes );
934 intf_DbgMsg("PES trashed - fifo full ! (%d, %d)\n",
935 p_es_descriptor->i_id, p_es_descriptor->i_type);
939 // intf_DbgMsg("Putting %p into fifo %p/%d\n",
940 // p_pes, p_fifo, p_fifo->i_end);
941 p_fifo->buffer[p_fifo->i_end] = p_pes;
942 DECODER_FIFO_INCEND( *p_fifo );
944 /* Warn the decoder that it's got work to do. */
945 pthread_cond_signal( &p_fifo->data_wait );
947 pthread_mutex_unlock( &p_fifo->data_lock );
951 intf_DbgMsg("No fifo to receive PES %p: trash\n", p_pes);
953 p_input->c_ts_packets_trashed += p_pes->i_ts_packets;
954 p_es_descriptor->c_invalid_packets += p_pes->i_ts_packets;
956 input_NetlistFreePES( p_input, p_pes );
962 /* If we are at the beginning of a new PES packet, we must fetch a new
963 PES buffer to begin with the reassembly of this PES packet. This is
964 also here that we can synchronise with the stream if we we lost
965 packets or if the decoder has just started */
970 /* Get a new one PES from the PES netlist. */
971 if( (p_pes = input_NetlistGetPES( p_input )) == (NULL) )
973 /* PES netlist is empty ! */
974 p_input->b_error = 1;
978 // intf_DbgMsg("New PES packet %p (first TS: %p)\n", p_pes, p_ts_packet);
980 /* Init the PES fields so that the first TS packet could be correctly
981 added to the PES packet (see below) */
982 p_pes->p_first_ts = p_ts_packet;
983 p_pes->p_last_ts = NULL;
985 /* If the last pes packet was null, this means that the synchronisation
986 was lost and so warn the decoder that he will have to find a way to
989 p_pes->b_data_loss = 1;
991 /* Read the b_random_access flag status and then reinit it */
992 p_pes->b_random_access = p_es_descriptor->b_random;
993 p_es_descriptor->b_random = 0;
998 /* If we are synchronised with the stream, and so if we are ready to
999 receive correctly the data, add the TS packet to the current PES
1003 // intf_DbgMsg("Adding TS %p to PES %p\n", p_ts_packet, p_pes);
1005 /* Size of the payload carried in the TS packet */
1006 i_ts_payload_size = p_ts_packet->i_payload_end -
1007 p_ts_packet->i_payload_start;
1009 /* Update the relations between the TS packets */
1010 p_ts_packet->p_prev_ts = p_pes->p_last_ts;
1011 p_ts_packet->p_next_ts = NULL;
1012 if( p_pes->i_ts_packets != 0 )
1014 /* Regarder si il serait pas plus efficace de ne creer que les liens
1015 precedent->suivant pour le moment, et les liens suivant->precedent
1016 quand le paquet est termine */
1017 /* Otherwise it is the first TS packet. */
1018 p_pes->p_last_ts->p_next_ts = p_ts_packet;
1020 /* Now add the TS to the PES packet */
1021 p_pes->p_last_ts = p_ts_packet;
1022 p_pes->i_ts_packets++;
1023 p_pes->i_pes_size += i_ts_payload_size;
1027 i_dummy = p_ts_packet->i_payload_end - p_ts_packet->i_payload_start;
1028 p_es_descriptor->c_payload_bytes += i_dummy;
1033 /* Since we don't use the TS packet to build a PES packet, we don't
1034 need it anymore, so give it back to the netlist */
1035 // intf_DbgMsg("Trashing TS %p: no PES being build\n", p_ts_packet);
1036 input_NetlistFreeTS( p_input, p_ts_packet );
1045 /*******************************************************************************
1047 *******************************************************************************
1048 * Notice that current ES state has been locked by input_SortPacket. (No more true,
1049 * changed by benny - See if it'a ok, and definitely change the code ???????? )
1050 *******************************************************************************/
1051 static __inline__ void input_DemuxPSI( input_thread_t *p_input,
1052 ts_packet_t *p_ts_packet,
1053 es_descriptor_t *p_es_descriptor,
1054 boolean_t b_unit_start, boolean_t b_packet_lost )
1056 int i_data_offset; /* Offset of the interesting data in the TS packet */
1057 u16 i_data_length; /* Length of those data */
1058 boolean_t b_first_section; /* Was there another section in the TS packet ? */
1061 ASSERT(p_ts_packet);
1062 ASSERT(p_es_descriptor);
1064 #define p_psi (p_es_descriptor->p_psi_section)
1066 // intf_DbgMsg( "input debug: PSI demultiplexing %p (%p)\n", p_ts_packet, p_input);
1068 // 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);
1070 /* The section we will deal with during the first iteration of the following
1071 loop is the first one contained in the TS packet */
1072 b_first_section = 1;
1074 /* Reassemble the pieces of sections contained in the TS packet and decode
1075 the sections that could have been completed */
1078 /* Has the reassembly of a section already began in a previous packet ? */
1079 if( p_psi->b_running_section )
1081 /* Was data lost since the last TS packet ? */
1084 /* Discard the section and wait for the begining of a new one to resynch */
1085 p_psi->b_running_section = 0;
1086 intf_DbgMsg( "Section discarded due to packet loss\n" );
1090 /* The data that complete a previously began section are always at
1091 the beginning of the TS payload... */
1092 i_data_offset = p_ts_packet->i_payload_start;
1093 /* ...Unless there is a pointer field, that we have to bypass */
1096 // intf_DbgMsg( "New part of the section received at offset %d\n", i_data_offset );
1099 /* We are looking for the beginning of a new section */
1104 /* Cannot do anything with those data: trash both PSI section and TS packet */
1105 p_psi->b_running_section = 0;
1110 /* Get the offset at which the data for that section can be found */
1111 if( b_first_section )
1113 /* The offset is stored in the pointer_field since we are interested in
1114 the first section of the TS packet. Note that the +1 is to bypass
1115 the pointer field */
1116 i_data_offset = p_ts_packet->i_payload_start +
1117 p_ts_packet->buffer[p_ts_packet->i_payload_start] + 1;
1121 /* Since no gap is allowed between 2 sections in a TS packet, the
1122 offset is given by the end of the previous section. In fact, there
1123 is nothing to do, i_offset was set to the right value in the
1124 previous iteration */
1126 // intf_DbgMsg( "New section beginning at offset %d in TS packet\n", i_data_offset );
1128 /* Read the length of that section */
1129 p_psi->i_length = (U16_AT(&p_ts_packet->buffer[i_data_offset+1]) & 0xFFF) + 3;
1130 // intf_DbgMsg( "Section length %d\n", p_psi->i_length );
1131 if( p_psi->i_length > PSI_SECTION_SIZE )
1133 /* The TS packet is corrupted, stop here to avoid possible a seg fault */
1134 intf_DbgMsg( "Section size is too big, aborting its reception\n" );
1138 /* Init the reassembly of that section */
1139 p_psi->b_running_section = 1;
1140 p_psi->i_current_position = 0;
1144 /* Compute the length of data related to the section in this TS packet */
1145 if( p_psi->i_length - p_psi->i_current_position > TS_PACKET_SIZE - i_data_offset)
1146 i_data_length = TS_PACKET_SIZE - i_data_offset;
1148 i_data_length = p_psi->i_length - p_psi->i_current_position;
1150 /* Copy those data in the section buffer */
1151 memcpy( &p_psi->buffer[p_psi->i_current_position], &p_ts_packet->buffer[i_data_offset],
1154 /* Interesting data are now after the ones we copied */
1155 i_data_offset += i_data_length;
1157 /* Decode the packet if it is now complete */
1158 if (p_psi->i_length == p_psi->i_current_position + i_data_length)
1160 /* Packet is complete, decode it */
1161 // intf_DbgMsg( "SECTION COMPLETE: starting decoding of its data\n" );
1162 input_PsiDecode( p_input, p_psi );
1164 /* Prepare the buffer to receive a new section */
1165 p_psi->i_current_position = 0;
1166 p_psi->b_running_section = 0;
1168 /* The new section won't be the first anymore */
1169 b_first_section = 0;
1173 /* Prepare the buffer to receive the next part of the section */
1174 p_psi->i_current_position += i_data_length;
1175 // intf_DbgMsg( "Section not complete, waiting for the end\n" );
1178 // intf_DbgMsg( "Must loop ? Next data offset: %d, stuffing: %d\n",
1179 // i_data_offset, p_ts_packet->buffer[i_data_offset] );
1181 /* Stop if we reached the end of the packet or stuffing bytes */
1182 while( i_data_offset < TS_PACKET_SIZE && p_ts_packet->buffer[i_data_offset] != 0xFF );
1184 /* Relase the TS packet, we don't need it anymore */
1185 input_NetlistFreeTS( p_input, p_ts_packet );