1 /*******************************************************************************
2 * input.c: input thread
4 *******************************************************************************
5 * Read an MPEG2 stream, demultiplex and parse it before sending it to
7 ******************************************************************************/
9 /*******************************************************************************
11 ******************************************************************************/
13 #include <sys/uio.h> /* iovec */
17 #include <X11/extensions/XShm.h>
18 #include <sys/soundcard.h>
20 #include <stdlib.h> /* atoi(), malloc(), free() */
22 #include <sys/ioctl.h> /* ioctl() */
23 #include <net/if.h> /* ifreq */
24 #include <netinet/in.h>
29 #include "vlc_thread.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 void ErrorThread( input_thread_t *p_input );
53 static void EndThread( input_thread_t *p_input );
54 static __inline__ int input_ReadPacket( input_thread_t *p_input );
55 static __inline__ void input_SortPacket( input_thread_t *p_input,
56 ts_packet_t *ts_packet );
57 static __inline__ void input_DemuxTS( input_thread_t *p_input,
58 ts_packet_t *ts_packet,
59 es_descriptor_t *es_descriptor );
60 static __inline__ void input_DemuxPES( input_thread_t *p_input,
61 ts_packet_t *ts_packet,
62 es_descriptor_t *p_es_descriptor,
63 boolean_t b_unit_start, boolean_t b_packet_lost );
64 static __inline__ void input_DemuxPSI( input_thread_t *p_input,
65 ts_packet_t *ts_packet,
66 es_descriptor_t *p_es_descriptor,
67 boolean_t b_unit_start, boolean_t b_packet_lost );
69 /*******************************************************************************
70 * input_CreateThread: initialize and spawn an input thread
71 *******************************************************************************
72 * This function initializes and spawns an input thread. It returns NULL on
73 * failure. If you want a better understanding of the input thread, don't start
74 * by reading this function :-).
75 *******************************************************************************/
76 input_thread_t *input_CreateThread( input_cfg_t *p_cfg )
78 input_thread_t * p_input;
81 intf_DbgMsg("input debug 1-1: creating thread (cfg : %p)\n", p_cfg );
83 /* Allocate input_thread_t structure. */
84 if( !( p_input = (input_thread_t *)malloc(sizeof(input_thread_t)) ) )
86 intf_ErrMsg("input error: can't allocate input thread structure (%s)\n",
91 bzero( p_input, sizeof(input_thread_t));
92 for( i_index = 0; i_index < INPUT_MAX_ES; i_index++ )
94 p_input->p_es[i_index].i_id = EMPTY_PID;
97 /* Find out which method we are gonna use and retrieve pointers. */
98 if( !((p_cfg->i_properties) & INPUT_CFG_METHOD) )
100 /* i_method is not set. */
101 intf_DbgMsg("input debug: using default method (%d)\n",
102 INPUT_DEFAULT_METHOD);
103 p_cfg->i_method = INPUT_DEFAULT_METHOD;
104 p_cfg->i_properties |= INPUT_CFG_METHOD;
106 p_input->i_method = p_cfg->i_method;
107 switch( p_cfg->i_method )
110 case INPUT_METHOD_TS_FILE:
111 p_input->p_open = &input_FileCreateMethod;
112 p_input->p_read = &input_FileRead;
113 p_input->p_clean = &input_FileDestroyMethod;
116 /* Network methods */
117 case INPUT_METHOD_TS_UCAST:
118 case INPUT_METHOD_TS_MCAST:
119 case INPUT_METHOD_TS_BCAST:
120 case INPUT_METHOD_TS_VLAN_BCAST:
121 p_input->p_open = &input_NetworkCreateMethod;
122 p_input->p_read = &input_NetworkRead;
123 p_input->p_clean = &input_NetworkDestroyMethod;
126 case INPUT_METHOD_NONE:
129 /* Internal error, which should never happen */
130 intf_DbgMsg("input debug: unknow method type %d\n",
137 /* Initialize PSI decoder. */
138 intf_DbgMsg("Initializing PSI decoder\n");
139 if( input_PsiInit( p_input ) == -1 )
145 /* Initialize PCR decoder. */
146 intf_DbgMsg("Initializing PCR decoder\n");
147 if( input_PcrInit( p_input ) == -1 )
149 input_PsiClean( p_input );
154 /* Initialize netlists. */
155 if( input_NetlistOpen( p_input ) )
157 input_PsiClean( p_input );
158 input_PcrClean( p_input );
164 /* Initialize counters. */
165 p_input->c_bytes = 0;
166 p_input->c_payload_bytes = 0;
167 p_input->c_ts_packets_read = 0;
168 p_input->c_ts_packets_trashed = 0;
170 p_input->c_loops = 0;
174 /* Let the appropriate method open the socket. */
175 if( (*(p_input->p_open))( p_input, p_cfg ) == -1 )
177 input_NetlistClean( p_input );
178 input_PsiClean( p_input );
179 input_PcrClean( p_input );
184 intf_DbgMsg("input debug: method %d properly initialized the socket\n",
187 /* Create thread and set locks. */
189 vlc_mutex_init( &p_input->netlist.lock );
190 vlc_mutex_init( &p_input->programs_lock );
191 vlc_mutex_init( &p_input->es_lock );
193 input_Thread( p_input );
195 if( vlc_thread_create(&p_input->thread_id, "input", (vlc_thread_func)input_Thread,
198 intf_ErrMsg("input error: can't spawn input thread (%s)\n",
200 (*p_input->p_clean)( p_input );
201 input_NetlistClean( p_input );;
202 input_PsiClean( p_input );
203 input_PcrClean( p_input );
209 /* Default setting for new decoders */
210 p_input->p_aout = p_cfg->p_aout;
215 /******************************************************************************
216 * input_DestroyThread: mark an input thread as zombie
217 ******************************************************************************
218 * This function should not return until the thread is effectively cancelled.
219 ******************************************************************************/
220 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 */
225 /* Remove this as soon as the "status" flag is implemented */
226 vlc_thread_join( p_input->thread_id ); /* wait until it's done */
230 /*******************************************************************************
231 * input_OpenAudioStream: open an audio stream
232 *******************************************************************************
233 * This function spawns an audio decoder and plugs it on the audio output
235 *******************************************************************************/
236 int input_OpenAudioStream( input_thread_t *p_input, int i_id )
241 /*******************************************************************************
242 * input_CloseAudioStream: close an audio stream
243 *******************************************************************************
244 * This function destroys an audio decoder.
245 *******************************************************************************/
246 void input_CloseAudioStream( input_thread_t *p_input, int i_id )
251 /*******************************************************************************
252 * input_OpenVideoStream: open a video stream
253 *******************************************************************************
254 * This function spawns a video decoder and plugs it on a video output thread.
255 *******************************************************************************/
256 int input_OpenVideoStream( input_thread_t *p_input,
257 struct vout_thread_s *p_vout, struct video_cfg_s * p_cfg )
262 /*******************************************************************************
263 * input_CloseVideoStream: close a video stream
264 *******************************************************************************
265 * This function destroys an video decoder.
266 *******************************************************************************/
267 void input_CloseVideoStream( input_thread_t *p_input, int i_id )
273 /* following functions are local */
275 /*******************************************************************************
276 * input_Thread: input thread
277 *******************************************************************************
278 * Thread in charge of processing the network packets and demultiplexing.
279 *******************************************************************************/
280 static void input_Thread( input_thread_t *p_input )
282 intf_DbgMsg("input debug 11-1: thread %p is active\n", p_input);
283 while( !p_input->b_die && !p_input->b_error )
285 /* Scatter read the UDP packet from the network or the file. */
286 if( (input_ReadPacket( p_input )) == (-1) )
288 /* ??? Normally, a thread can't kill itself, but we don't have
289 * any method in case of an error condition ... */
290 p_input->b_error = 1;
298 if( p_input->b_error )
300 ErrorThread( p_input );
303 /* Ohoh, we have to die as soon as possible. */
304 EndThread( p_input );
306 intf_DbgMsg("input debug: thread %p destroyed\n", p_input);
307 vlc_thread_exit( 0 );
311 /******************************************************************************
312 * ErrorThread: RunThread() error loop
313 ******************************************************************************/
314 static void ErrorThread( input_thread_t *p_input )
316 while( !p_input->b_die )
318 msleep( INPUT_IDLE_SLEEP );
322 /*******************************************************************************
323 * EndThread: end the input thread
324 *******************************************************************************/
325 static void EndThread( input_thread_t * p_input )
329 (*p_input->p_clean)( p_input ); /* close input method */
331 /* Destroy all decoder threads. */
332 for( i_es_loop = 0; i_es_loop < INPUT_MAX_ES; i_es_loop++ )
334 if( p_input->pp_selected_es[i_es_loop] )
336 switch( p_input->pp_selected_es[i_es_loop]->i_type )
340 vdec_DestroyThread( (vdec_thread_t*)(p_input->pp_selected_es[i_es_loop]->p_dec) /*, NULL */ );
345 adec_DestroyThread( (adec_thread_t*)(p_input->pp_selected_es[i_es_loop]->p_dec) );
354 /* pp_selected_es should not contain any hole. */
359 input_NetlistClean( p_input ); /* clean netlist */
360 input_PsiClean( p_input ); /* clean PSI information */
361 input_PcrClean( p_input ); /* clean PCR information */
362 free( p_input ); /* free input_thread structure */
364 intf_DbgMsg("input debug: EndThread(%p)\n", p_input);
367 /*******************************************************************************
368 * input_ReadPacket: reads a packet from the network or the file
369 *******************************************************************************/
370 static __inline__ int input_ReadPacket( input_thread_t *p_input )
372 int i_base_index; /* index of the first free iovec */
375 #ifdef INPUT_LIFO_TS_NETLIST
376 int i_meanwhile_released;
377 int i_currently_removed;
379 ts_packet_t * p_ts_packet;
381 /* In this function, we only care about the TS netlist. PES netlist
382 * is for the demultiplexer. */
383 #ifdef INPUT_LIFO_TS_NETLIST
384 i_base_index = p_input->netlist.i_ts_index;
386 /* Verify that we still have packets in the TS netlist */
387 if( (INPUT_MAX_TS + INPUT_TS_READ_ONCE - 1 - p_input->netlist.i_ts_index) <= INPUT_TS_READ_ONCE )
389 intf_ErrMsg("input error: TS netlist is empty !\n");
393 #else /* FIFO netlist */
394 i_base_index = p_input->netlist.i_ts_start;
395 if( p_input->netlist.i_ts_start + INPUT_TS_READ_ONCE -1 > INPUT_MAX_TS )
397 /* The netlist is splitted in 2 parts. We must gather them to consolidate
398 the FIFO (we make the loop easily in having the same iovec at the far
399 end and in the beginning of netlist_free).
400 That's why the netlist is (INPUT_MAX_TS +1) + (INPUT_TS_READ_ONCE -1)
402 memcpy( p_input->netlist.p_ts_free + INPUT_MAX_TS + 1,
403 p_input->netlist.p_ts_free,
404 (p_input->netlist.i_ts_start + INPUT_TS_READ_ONCE - 1 - INPUT_MAX_TS)
405 * sizeof(struct iovec) );
408 /* Verify that we still have packets in the TS netlist */
409 if( ((p_input->netlist.i_ts_end -1 - p_input->netlist.i_ts_start) & INPUT_MAX_TS) <= INPUT_TS_READ_ONCE )
411 intf_ErrMsg("input error: TS netlist is empty !\n");
414 #endif /* FIFO netlist */
416 /* Scatter read the buffer. */
417 i_packet_size = (*p_input->p_read)( p_input,
418 &p_input->netlist.p_ts_free[i_base_index],
419 INPUT_TS_READ_ONCE );
420 if( i_packet_size == (-1) )
422 // intf_DbgMsg("Read packet %d %p %d %d\n", i_base_index,
423 // &p_input->netlist.p_ts_free[i_base_index],
424 // p_input->netlist.i_ts_start,
425 // p_input->netlist.i_ts_end);
426 intf_ErrMsg("input error: readv() failed (%s)\n", strerror(errno));
430 if( i_packet_size == 0 )
432 /* No packet has been received, so stop here. */
436 /* Demultiplex the TS packets (1..INPUT_TS_READ_ONCE) received. */
437 for( i_current_index = i_base_index;
438 (i_packet_size -= TS_PACKET_SIZE) >= 0;
441 /* BTW, something REALLY bad could happen if we receive packets with
443 p_ts_packet = (ts_packet_t*)(p_input->netlist.p_ts_free[i_current_index].iov_base);
444 /* Don't cry :-), we are allowed to do that cast, because initially,
445 our buffer was malloc'ed with sizeof(ts_packet_t) */
447 /* Find out if we need this packet and demultiplex. */
448 input_SortPacket( p_input /* for current PIDs and netlist */,
452 if( i_packet_size > 0 )
454 intf_ErrMsg("input error: wrong size\n");
458 /* Remove the TS packets we have just filled from the netlist */
459 #ifdef INPUT_LIFO_TS_NETLIST
460 /* We need to take a lock here while we're calculating index positions. */
461 vlc_mutex_lock( &p_input->netlist.lock );
463 i_meanwhile_released = i_base_index - p_input->netlist.i_ts_index;
464 if( i_meanwhile_released )
466 /* That's where it becomes funny :-). Since we didn't take locks for
467 efficiency reasons, other threads (including ourselves, with
468 input_DemuxPacket) might have released packets to the netlist.
469 So we have to copy these iovec where they should go.
471 BTW, that explains why the TS netlist is
472 (INPUT_MAX_TS +1) + (TS_READ_ONCE -1) large. */
474 i_currently_removed = i_current_index - i_base_index;
475 if( i_meanwhile_released < i_currently_removed )
477 /* Copy all iovecs in that case */
478 memcpy( &p_input->netlist.p_ts_free[p_input->netlist.i_ts_index]
479 + i_currently_removed,
480 &p_input->netlist.p_ts_free[p_input->netlist.i_ts_index],
481 i_meanwhile_released * sizeof(struct iovec) );
485 /* We have fewer places than items, so we only move
486 i_currently_removed of them. */
487 memcpy( &p_input->netlist.p_ts_free[i_base_index],
488 &p_input->netlist.p_ts_free[p_input->netlist.i_ts_index],
489 i_currently_removed * sizeof(struct iovec) );
492 /* Update i_netlist_index with the information gathered above. */
493 p_input->netlist.i_ts_index += i_currently_removed;
497 /* Nothing happened. */
498 p_input->netlist.i_ts_index = i_current_index;
501 vlc_mutex_unlock( &p_input->netlist.lock );
503 #else /* FIFO netlist */
504 /* & is modulo ; that's where we make the loop. */
505 p_input->netlist.i_ts_start = i_current_index & INPUT_MAX_TS;
509 p_input->c_ts_packets_read += i_current_index - i_base_index;
510 p_input->c_bytes += (i_current_index - i_base_index) * TS_PACKET_SIZE;
515 /*******************************************************************************
516 * input_SortPacket: find out whether we need that packet
517 *******************************************************************************/
518 static __inline__ void input_SortPacket( input_thread_t *p_input,
519 ts_packet_t *p_ts_packet )
524 /* Verify that sync_byte, error_indicator and scrambling_control are
526 if( !(p_ts_packet->buffer[0] == 0x47) || (p_ts_packet->buffer[1] & 0x80) ||
527 (p_ts_packet->buffer[3] & 0xc0) )
529 intf_DbgMsg("input debug: invalid TS header (%p)\n", p_ts_packet);
533 /* Get the PID of the packet. Note that ntohs is needed, for endianness
534 purposes (see man page). */
535 i_current_pid = U16_AT(&p_ts_packet->buffer[1]) & 0x1fff;
537 // intf_DbgMsg("input debug: pid %d received (%p)\n",
538 // i_current_pid, p_ts_packet);
540 /* Lock current ES state. */
541 vlc_mutex_lock( &p_input->es_lock );
543 /* Verify that we actually want this PID. */
544 for( i_es_loop = 0; i_es_loop < INPUT_MAX_SELECTED_ES; i_es_loop++ )
546 if( p_input->pp_selected_es[i_es_loop] != NULL)
548 if( (*p_input->pp_selected_es[i_es_loop]).i_id
551 /* Don't need the lock anymore, since the value pointed
552 out by p_input->pp_selected_es[i_es_loop] can only be
553 modified from inside the input_thread (by the PSI
554 decoder): interface thread is only allowed to modify
555 the pp_selected_es table */
556 vlc_mutex_unlock( &p_input->es_lock );
558 /* We're interested. Pass it to the demultiplexer. */
559 input_DemuxTS( p_input, p_ts_packet,
560 p_input->pp_selected_es[i_es_loop] );
566 /* pp_selected_es should not contain any hole. */
570 vlc_mutex_unlock( &p_input->es_lock );
573 /* We weren't interested in receiving this packet. Give it back to the
575 // intf_DbgMsg("SortPacket: freeing unwanted TS %p (pid %d)\n", p_ts_packet,
576 // U16_AT(&p_ts_packet->buffer[1]) & 0x1fff);
577 input_NetlistFreeTS( p_input, p_ts_packet );
579 p_input->c_ts_packets_trashed++;
583 /*******************************************************************************
584 * input_DemuxTS: first step of demultiplexing: the TS header
585 *******************************************************************************
586 * Stream must also only contain PES and PSI, so PID must have been filtered
587 *******************************************************************************/
588 static __inline__ void input_DemuxTS( input_thread_t *p_input,
589 ts_packet_t *p_ts_packet,
590 es_descriptor_t *p_es_descriptor )
593 boolean_t b_adaption; /* Adaption field is present */
594 boolean_t b_payload; /* Packet carries payload */
595 boolean_t b_unit_start; /* A PSI or a PES start in the packet */
596 boolean_t b_trash = 0; /* Must the packet be trashed ? */
597 boolean_t b_lost = 0; /* Was there a packet lost ? */
601 ASSERT(p_es_descriptor);
603 #define p (p_ts_packet->buffer)
605 // intf_DbgMsg("input debug: TS-demultiplexing packet %p, pid %d, number %d\n",
606 // p_ts_packet, U16_AT(&p[1]) & 0x1fff, p[3] & 0x0f);
609 p_es_descriptor->c_packets++;
610 p_es_descriptor->c_bytes += TS_PACKET_SIZE;
613 /* Extract flags values from TS common header. */
614 b_unit_start = (p[1] & 0x40);
615 b_adaption = (p[3] & 0x20);
616 b_payload = (p[3] & 0x10);
618 /* Extract adaption field informations if any */
621 /* We don't have any adaptation_field, so payload start immediately
622 after the 4 byte TS header */
623 p_ts_packet->i_payload_start = 4;
627 /* p[4] is adaptation_field_length minus one */
628 p_ts_packet->i_payload_start = 5 + p[4];
630 /* The adaption field can be limited to the adaptation_field_length byte,
631 so that there is nothing to do: skip this possibility */
634 /* If the packet has both adaptation_field and payload, adaptation_field
635 cannot be more than 182 bytes long; if there is only an
636 adaptation_field, it must fill the next 183 bytes. */
637 if( b_payload ? (p[4] > 182) : (p[4] != 183) )
639 intf_DbgMsg("input debug: invalid TS adaptation field (%p)\n",
642 p_es_descriptor->c_invalid_packets++;
647 /* No we are sure that the byte containing flags is present: read it */
650 /* discontinuity_indicator */
653 intf_DbgMsg("discontinuity_indicator encountered by TS demux " \
654 "(position read: %d, saved: %d)\n", p[5] & 0x80,
655 p_es_descriptor->i_continuity_counter);
657 /* If the PID carries the PCR, there will be a system time-base
658 discontinuity. We let the PCR decoder handle that. */
659 p_es_descriptor->b_discontinuity = 1;
661 /* There also may be a continuity_counter discontinuity:
662 resynchronise our counter with the one of the stream */
663 p_es_descriptor->i_continuity_counter = (p[3] & 0x0f) - 1;
666 /* random_access_indicator */
667 p_es_descriptor->b_random |= p[5] & 0x40;
669 /* If this is a PCR_PID, and this TS packet contains a PCR,
670 we pass it along to the PCR decoder. */
671 if( (p_es_descriptor->b_pcr) && (p[5] & 0x10) )
673 /* There should be a PCR field in the packet, check if the
674 adaption field is long enough to carry it */
677 /* Call the PCR decoder */
678 input_PcrDecode( p_input, p_es_descriptor, &p[6] );
685 /* Check the continuity of the stream. */
686 i_dummy = ((p[3] & 0x0f) - p_es_descriptor->i_continuity_counter) & 0x0f;
689 /* Everything is ok, just increase our counter */
690 p_es_descriptor->i_continuity_counter++;
694 if( !b_payload && i_dummy == 0 )
696 /* This is a packet without payload, this is allowed by the draft
697 As there is nothing interessant in this packet (except PCR that
698 have already been handled), we can trash the packet. */
699 intf_DbgMsg("Packet without payload received by TS demux\n");
702 else if( i_dummy <= 0 )
704 /* Duplicate packet: mark it as being to be trashed. */
705 intf_DbgMsg("Duplicate packet received by TS demux\n");
708 else if( p_es_descriptor->i_continuity_counter == 0xFF )
710 /* This means that the packet is the first one we receive for this
711 ES since the continuity counter ranges between 0 and 0x0F
712 excepts when it has been initialized by the input: Init the
713 counter to the correct value. */
714 intf_DbgMsg("First packet for PID %d received by TS demux\n",
715 p_es_descriptor->i_id);
716 p_es_descriptor->i_continuity_counter = (p[3] & 0x0f);
720 /* This can indicate that we missed a packet or that the
721 continuity_counter wrapped and we received a dup packet: as we
722 don't know, do as if we missed a packet to be sure to recover
723 from this situation */
724 intf_DbgMsg("Packet lost by TS demux: current %d, packet %d\n",
725 p_es_descriptor->i_continuity_counter & 0x0f,
728 p_es_descriptor->i_continuity_counter = p[3] & 0x0f;
732 /* Trash the packet if it has no payload or if it is bad */
735 input_NetlistFreeTS( p_input, p_ts_packet );
737 p_input->c_ts_packets_trashed++;
742 if( p_es_descriptor->b_psi )
744 /* The payload contains PSI tables */
745 input_DemuxPSI( p_input, p_ts_packet, p_es_descriptor,
746 b_unit_start, b_lost );
750 /* The payload carries a PES stream */
751 input_DemuxPES( p_input, p_ts_packet, p_es_descriptor,
752 b_unit_start, b_lost );
762 /*******************************************************************************
764 *******************************************************************************
765 * Gather a PES packet and analyzes its header.
766 *******************************************************************************/
767 static __inline__ void input_DemuxPES( input_thread_t *p_input,
768 ts_packet_t *p_ts_packet,
769 es_descriptor_t *p_es_descriptor,
770 boolean_t b_unit_start,
771 boolean_t b_packet_lost )
773 decoder_fifo_t * p_fifo;
774 u8 i_pes_header_size;
776 pes_packet_t* p_last_pes;
778 int i_ts_payload_size;
781 #define p_pes (p_es_descriptor->p_pes_packet)
785 ASSERT(p_es_descriptor);
787 // intf_DbgMsg("PES-demultiplexing %p (%p)\n", p_ts_packet, p_pes);
789 /* If we lost data, discard the PES packet we are trying to reassemble
790 if any and wait for the beginning of a new one in order to synchronise
792 if( b_packet_lost && p_pes != NULL )
794 intf_DbgMsg("PES %p trashed because of packet lost\n", p_pes);
795 input_NetlistFreePES( p_input, p_pes );
799 /* If the TS packet contains the begining of a new PES packet, and if we
800 were reassembling a PES packet, then the PES should be complete now,
801 so parse its header and give it to the decoders */
802 if( b_unit_start && p_pes != NULL )
804 // intf_DbgMsg("End of PES packet %p\n", p_pes);
806 /* Parse the header. The header has a variable length, but in order
807 to improve the algorithm, we will read the 14 bytes we may be
809 p_ts = p_pes->p_first_ts;
810 i_ts_payload_size = p_ts->i_payload_end - p_ts->i_payload_start;
813 if(i_ts_payload_size >= PES_HEADER_SIZE)
815 /* This part of the header entirely fits in the payload of
816 the first TS packet */
817 p_pes->p_pes_header = &(p_ts->buffer[p_ts->i_payload_start]);
821 /* This part of the header does not fit in the current TS packet:
822 copy the part of the header we are interested in to the
823 p_pes_header_save buffer. The buffer is dynamicly allocated if
824 needed so it's time expensive but this situation almost never
826 intf_DbgMsg("Code never tested encountered, WARNING ! (benny)\n");
827 if( !p_pes->p_pes_header_save )
828 p_pes->p_pes_header_save = malloc(PES_HEADER_SIZE);
832 memcpy(p_pes->p_pes_header_save + i_dummy,
833 &p_ts->buffer[p_ts->i_payload_start], i_ts_payload_size);
834 i_dummy += i_ts_payload_size;
836 p_ts = p_ts->p_next_ts;
839 /* The payload of the PES packet is shorter than the 14 bytes
840 we would read. This means that high packet lost occured
841 so the PES won't be usefull for any decoder. Moreover,
842 this should never happen so we can trash the packet and
843 exit roughly without regrets */
844 intf_DbgMsg("PES packet too short: trashed\n");
845 input_NetlistFreePES( p_input, p_pes );
851 i_ts_payload_size = p_ts->i_payload_end - p_ts->i_payload_start;
853 while(i_ts_payload_size + i_dummy < PES_HEADER_SIZE);
855 /* This last TS packet is partly header, partly payload, so just
856 copy the header part */
857 memcpy(p_pes->p_pes_header_save + i_dummy,
858 &p_ts->buffer[p_ts->i_payload_start],
859 PES_HEADER_SIZE - i_dummy);
861 /* The header must be read in the buffer not in any TS packet */
862 p_pes->p_pes_header = p_pes->p_pes_header_save;
865 /* Now we have the part of the PES header we were interested in:
868 /* First read the 6 header bytes common to all PES packets:
869 use them to test the PES validity */
870 if( (p_pes->p_pes_header[0] || p_pes->p_pes_header[1] ||
871 (p_pes->p_pes_header[2] != 1)) ||
872 /* packet_start_code_prefix != 0x000001 */
873 ((i_dummy = U16_AT(p_pes->p_pes_header + 4)) &&
874 (i_dummy + 6 != p_pes->i_pes_size)) )
875 /* PES_packet_length is set and != total received payload */
877 /* Trash the packet and set p_pes to NULL to be sure the next PES
878 packet will have its b_data_lost flag set */
879 intf_DbgMsg("Corrupted PES packet received: trashed\n");
880 input_NetlistFreePES( p_input, p_pes );
886 /* The PES packet is valid. Check its type to test if it may
887 carry additional informations in a header extension */
888 p_pes->i_stream_id = p_pes->p_pes_header[3];
890 switch( p_pes->i_stream_id )
892 case 0xBE: /* Padding */
893 case 0xBC: /* Program stream map */
894 case 0xBF: /* Private stream 2 */
897 case 0xFF: /* Program stream directory */
898 case 0xF2: /* DSMCC stream */
899 case 0xF8: /* ITU-T H.222.1 type E stream */
900 /* The payload begins immediatly after the 6 bytes header, so
901 we have finished with the parsing */
902 i_pes_header_size = 6;
906 /* The PES header contains at least 3 more bytes: parse them */
907 p_pes->b_data_alignment = p_pes->p_pes_header[6] & 0x04;
908 p_pes->b_has_pts = p_pes->p_pes_header[7] & 0x80;
909 i_pes_header_size = 9 + p_pes->p_pes_header[8];
911 /* Now parse the optional header extensions (in the limit of
913 if( p_pes->b_has_pts )
915 pcr_descriptor_t * p_pcr;
917 p_pcr = p_input->p_pcr;
920 ( ((mtime_t)(p_pes->p_pes_header[9] & 0x0E) << 29) |
921 (((mtime_t)U16_AT(p_pes->p_pes_header + 10) << 14) - (1 << 14)) |
922 ((mtime_t)U16_AT(p_pes->p_pes_header + 12) >> 1) ) * 300;
925 if( p_pcr->i_synchro_state )
927 switch( p_pcr->i_synchro_state )
929 case SYNCHRO_NOT_STARTED:
930 p_pes->b_has_pts = 0;
934 p_pes->i_pts += p_pcr->delta_pcr;
935 p_pcr->delta_absolute = mdate() - p_pes->i_pts + 500000;
936 p_pes->i_pts += p_pcr->delta_absolute;
937 p_pcr->i_synchro_state = 0;
940 case SYNCHRO_REINIT: /* We skip a PES */
941 p_pes->b_has_pts = 0;
942 p_pcr->i_synchro_state = SYNCHRO_START;
948 p_pes->i_pts += p_pcr->delta_pcr + p_pcr->delta_absolute;
954 /* Now we've parsed the header, we just have to indicate in some
955 specific TS packets where the PES payload begins (renumber
956 i_payload_start), so that the decoders can find the beginning
957 of their data right out of the box. */
958 p_ts = p_pes->p_first_ts;
959 i_ts_payload_size = p_ts->i_payload_end - p_ts->i_payload_start;
960 while( i_pes_header_size > i_ts_payload_size )
962 /* These packets are entirely filled by the PES header. */
963 i_pes_header_size -= i_ts_payload_size;
964 p_ts->i_payload_start = p_ts->i_payload_end;
965 /* Go to the next TS packet: here we won't have to test it is
966 not NULL because we trash the PES packets when packet lost
968 p_ts = p_ts->p_next_ts;
969 i_ts_payload_size = p_ts->i_payload_end - p_ts->i_payload_start;
971 /* This last packet is partly header, partly payload. */
972 p_ts->i_payload_start += i_pes_header_size;
974 /* Now we can eventually put the PES packet in the decoder's
976 switch( p_es_descriptor->i_type )
980 p_fifo = &(((vdec_thread_t*)(p_es_descriptor->p_dec))->fifo);
984 p_fifo = &(((adec_thread_t*)(p_es_descriptor->p_dec))->fifo);
987 /* This should never happen. */
988 intf_DbgMsg("Unknown stream type (%d, %d): PES trashed\n",
989 p_es_descriptor->i_id, p_es_descriptor->i_type);
996 vlc_mutex_lock( &p_fifo->data_lock );
997 if( DECODER_FIFO_ISFULL( *p_fifo ) )
999 /* The FIFO is full !!! This should not happen. */
1001 p_input->c_ts_packets_trashed += p_pes->i_ts_packets;
1002 p_es_descriptor->c_invalid_packets += p_pes->i_ts_packets;
1004 input_NetlistFreePES( p_input, p_pes );
1005 intf_DbgMsg("PES trashed - fifo full ! (%d, %d)\n",
1006 p_es_descriptor->i_id, p_es_descriptor->i_type);
1010 // intf_DbgMsg("Putting %p into fifo %p/%d\n",
1011 // p_pes, p_fifo, p_fifo->i_end);
1012 p_fifo->buffer[p_fifo->i_end] = p_pes;
1013 DECODER_FIFO_INCEND( *p_fifo );
1015 /* Warn the decoder that it's got work to do. */
1016 vlc_cond_signal( &p_fifo->data_wait );
1018 vlc_mutex_unlock( &p_fifo->data_lock );
1022 intf_DbgMsg("No fifo to receive PES %p: trash\n", p_pes);
1024 p_input->c_ts_packets_trashed += p_pes->i_ts_packets;
1025 p_es_descriptor->c_invalid_packets += p_pes->i_ts_packets;
1027 input_NetlistFreePES( p_input, p_pes );
1033 /* If we are at the beginning of a new PES packet, we must fetch a new
1034 PES buffer to begin with the reassembly of this PES packet. This is
1035 also here that we can synchronise with the stream if we we lost
1036 packets or if the decoder has just started */
1041 /* Get a new one PES from the PES netlist. */
1042 if( (p_pes = input_NetlistGetPES( p_input )) == (NULL) )
1044 /* PES netlist is empty ! */
1045 p_input->b_error = 1;
1049 // intf_DbgMsg("New PES packet %p (first TS: %p)\n", p_pes, p_ts_packet);
1051 /* Init the PES fields so that the first TS packet could be correctly
1052 added to the PES packet (see below) */
1053 p_pes->p_first_ts = p_ts_packet;
1054 p_pes->p_last_ts = NULL;
1056 /* If the last pes packet was null, this means that the synchronisation
1057 was lost and so warn the decoder that he will have to find a way to
1060 p_pes->b_data_loss = 1;
1062 /* Read the b_random_access flag status and then reinit it */
1063 p_pes->b_random_access = p_es_descriptor->b_random;
1064 p_es_descriptor->b_random = 0;
1069 /* If we are synchronised with the stream, and so if we are ready to
1070 receive correctly the data, add the TS packet to the current PES
1074 // intf_DbgMsg("Adding TS %p to PES %p\n", p_ts_packet, p_pes);
1076 /* Size of the payload carried in the TS packet */
1077 i_ts_payload_size = p_ts_packet->i_payload_end -
1078 p_ts_packet->i_payload_start;
1080 /* Update the relations between the TS packets */
1081 p_ts_packet->p_prev_ts = p_pes->p_last_ts;
1082 p_ts_packet->p_next_ts = NULL;
1083 if( p_pes->i_ts_packets != 0 )
1085 /* Regarder si il serait pas plus efficace de ne creer que les liens
1086 precedent->suivant pour le moment, et les liens suivant->precedent
1087 quand le paquet est termine */
1088 /* Otherwise it is the first TS packet. */
1089 p_pes->p_last_ts->p_next_ts = p_ts_packet;
1091 /* Now add the TS to the PES packet */
1092 p_pes->p_last_ts = p_ts_packet;
1093 p_pes->i_ts_packets++;
1094 p_pes->i_pes_size += i_ts_payload_size;
1098 i_dummy = p_ts_packet->i_payload_end - p_ts_packet->i_payload_start;
1099 p_es_descriptor->c_payload_bytes += i_dummy;
1104 /* Since we don't use the TS packet to build a PES packet, we don't
1105 need it anymore, so give it back to the netlist */
1106 // intf_DbgMsg("Trashing TS %p: no PES being build\n", p_ts_packet);
1107 input_NetlistFreeTS( p_input, p_ts_packet );
1116 /*******************************************************************************
1118 *******************************************************************************
1119 * Notice that current ES state has been locked by input_SortPacket. (No more true,
1120 * changed by benny - See if it's ok, and definitely change the code ???????? )
1121 *******************************************************************************/
1122 static __inline__ void input_DemuxPSI( input_thread_t *p_input,
1123 ts_packet_t *p_ts_packet,
1124 es_descriptor_t *p_es_descriptor,
1125 boolean_t b_unit_start, boolean_t b_packet_lost )
1127 int i_data_offset; /* Offset of the interesting data in the TS packet */
1128 u16 i_data_length; /* Length of those data */
1129 //boolean_t b_first_section; /* Was there another section in the TS packet ? */
1132 ASSERT(p_ts_packet);
1133 ASSERT(p_es_descriptor);
1135 #define p_psi (p_es_descriptor->p_psi_section)
1137 // intf_DbgMsg( "input debug: PSI demultiplexing %p (%p)\n", p_ts_packet, p_input);
1139 // 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);
1142 /* Try to find the beginning of the payload in the packet to initialise
1143 the do-while loop that follows -> Compute the i_data_offset variable:
1144 by default, the value is set so that we won't enter in the while loop.
1145 It will be set to a correct value if the data are not corrupted */
1146 i_data_offset = TS_PACKET_SIZE;
1148 /* Has the reassembly of a section already began in a previous packet ? */
1149 if( p_psi->b_running_section )
1151 /* Was data lost since the last TS packet ? */
1154 /* Discard the packet and wait for the begining of a new one to resynch */
1155 p_psi->b_running_section = 0;
1156 p_psi->i_current_position = 0;
1157 intf_DbgMsg( "PSI section(s) discarded due to packet loss\n" );
1161 /* The data that complete a previously began section are always at
1162 the beginning of the TS payload... */
1163 i_data_offset = p_ts_packet->i_payload_start;
1164 /* ...Unless there is a pointer field, that we have to bypass */
1167 // intf_DbgMsg( "New part of the section received at offset %d\n", i_data_offset );
1170 /* We are looking for the beginning of a new section */
1175 /* Get the offset at which the data for that section can be found
1176 The offset is stored in the pointer_field since we are interested in
1177 the first section of the TS packet. Note that the +1 is to bypass
1178 the pointer field */
1179 i_data_offset = p_ts_packet->i_payload_start +
1180 p_ts_packet->buffer[p_ts_packet->i_payload_start] + 1;
1181 // intf_DbgMsg( "New section beginning at offset %d in TS packet\n", i_data_offset );
1185 /* This may either mean that the TS is bad or that the packet contains
1186 the end of a section that had been discarded in a previous loop:
1187 trash the TS packet since we cannot do anything with those data: */
1188 p_psi->b_running_section = 0;
1189 p_psi->i_current_position = 0;
1190 intf_DbgMsg( "PSI packet discarded due to lack of synchronisation\n" );
1194 /* The section we will deal with during the first iteration of the following
1195 loop is the first one contained in the TS packet */
1196 // b_first_section = 1;
1198 /* Reassemble the pieces of sections contained in the TS packet and decode
1199 the sections that could have been completed.
1200 Stop when we reach the end of the packet or stuffing bytes */
1201 while( i_data_offset < TS_PACKET_SIZE && p_ts_packet->buffer[i_data_offset] != 0xFF )
1203 /* If the current section is a new one, reinit the data fields of the p_psi
1204 struct to start its decoding */
1205 if( !p_psi->b_running_section )
1207 /* Read the length of the new section */
1208 p_psi->i_length = (U16_AT(&p_ts_packet->buffer[i_data_offset+1]) & 0xFFF) + 3;
1209 // intf_DbgMsg( "Section length %d\n", p_psi->i_length );
1210 if( p_psi->i_length > PSI_SECTION_SIZE )
1212 /* The TS packet is corrupted, stop here to avoid possible a seg fault */
1213 intf_DbgMsg( "PSI Section size is too big, aborting its reception\n" );
1217 /* Init the reassembly of that section */
1218 p_psi->b_running_section = 1;
1219 p_psi->i_current_position = 0;
1222 /* Compute the length of data related to the section in this TS packet */
1223 if( p_psi->i_length - p_psi->i_current_position > TS_PACKET_SIZE - i_data_offset)
1224 i_data_length = TS_PACKET_SIZE - i_data_offset;
1226 i_data_length = p_psi->i_length - p_psi->i_current_position;
1228 /* Copy those data in the section buffer */
1229 memcpy( &p_psi->buffer[p_psi->i_current_position], &p_ts_packet->buffer[i_data_offset],
1232 /* Interesting data are now after the ones we copied, since no gap is
1233 allowed between 2 sections in a TS packets */
1234 i_data_offset += i_data_length;
1236 /* Decode the packet if it is now complete */
1237 if (p_psi->i_length == p_psi->i_current_position + i_data_length)
1239 /* Packet is complete, decode it */
1240 // intf_DbgMsg( "SECTION COMPLETE: starting decoding of its data\n" );
1241 input_PsiDecode( p_input, p_psi );
1243 /* Prepare the buffer to receive a new section */
1244 p_psi->i_current_position = 0;
1245 p_psi->b_running_section = 0;
1247 /* The new section won't be the first anymore */
1248 //b_first_section = 0;
1252 /* Prepare the buffer to receive the next part of the section */
1253 p_psi->i_current_position += i_data_length;
1254 // intf_DbgMsg( "Section not complete, waiting for the end\n" );
1257 // intf_DbgMsg( "Must loop ? Next data offset: %d, stuffing: %d\n",
1258 // i_data_offset, p_ts_packet->buffer[i_data_offset] );
1261 /* Relase the TS packet, we don't need it anymore */
1262 input_NetlistFreeTS( p_input, p_ts_packet );