1 /*****************************************************************************
2 * input.c: input thread
3 * Read an MPEG2 stream, demultiplex and parse it before sending it to
5 *****************************************************************************
6 * Copyright (C) 1998, 1999, 2000 VideoLAN
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
20 * You should have received a copy of the GNU General Public
21 * License along with this program; if not, write to the
22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 * Boston, MA 02111-1307, USA.
24 *****************************************************************************/
26 /*****************************************************************************
28 *****************************************************************************/
31 #include <errno.h> /* errno */
32 #include <sys/types.h> /* on BSD, uio.h needs types.h */
33 #include <sys/uio.h> /* "input.h" */
34 #include <string.h> /* strerror() */
36 #include <stdlib.h> /* free() */
37 #include <netinet/in.h> /* ntohs() */
48 #include "input_psi.h"
49 #include "input_pcr.h"
50 #include "input_netlist.h"
51 #include "decoder_fifo.h"
52 #include "input_file.h"
53 #include "input_network.h"
55 #include "audio_output.h" /* aout_thread_t */
57 #include "audio_decoder.h" /* adec_thread_t */
59 #include "ac3_decoder.h" /* ac3dec_t (for ac3_decoder_thread.h) */
60 #include "ac3_decoder_thread.h" /* ac3dec_thread_t */
62 #include "video.h" /* picture_t (for video_output.h) */
63 #include "video_output.h" /* vout_thread_t */
65 #include "vdec_idct.h" /* dctelem_t (for video_parser.h) */
66 #include "vdec_motion.h" /* f_motion_t (for video_parser.h) */
67 #include "vpar_blocks.h" /* macroblock_t (for video_parser.h) */
68 #include "vpar_headers.h" /* sequence_t (for video_parser.h) */
69 #include "vpar_synchro.h" /* video_synchro_t (for video_parser.h) */
70 #include "video_parser.h" /* vpar_thread_t */
72 #include "spu_decoder.h" /* spudec_thread_t */
76 /*****************************************************************************
78 *****************************************************************************/
79 static void RunThread ( input_thread_t *p_input );
80 static void ErrorThread ( input_thread_t *p_input );
81 static void EndThread ( input_thread_t *p_input );
83 static __inline__ int input_ReadPacket( input_thread_t *p_input );
84 static __inline__ void input_SortPacket( input_thread_t *p_input,
85 ts_packet_t *ts_packet );
86 static __inline__ void input_DemuxTS( input_thread_t *p_input,
87 ts_packet_t *ts_packet,
88 es_descriptor_t *es_descriptor );
89 static __inline__ void input_DemuxPES( input_thread_t *p_input,
90 ts_packet_t *ts_packet,
91 es_descriptor_t *p_es_descriptor,
92 boolean_t b_unit_start, boolean_t b_packet_lost );
93 static __inline__ void input_DemuxPSI( input_thread_t *p_input,
94 ts_packet_t *ts_packet,
95 es_descriptor_t *p_es_descriptor,
96 boolean_t b_unit_start, boolean_t b_packet_lost );
98 /*****************************************************************************
99 * input_CreateThread: creates a new input thread
100 *****************************************************************************
101 * This function creates a new input, and returns a pointer
102 * to its description. On error, it returns NULL.
103 * If pi_status is NULL, then the function will block until the thread is ready.
104 * If not, it will be updated using one of the THREAD_* constants.
105 *****************************************************************************/
106 input_thread_t *input_CreateThread ( int i_method, char *psz_source, int i_port, int i_vlan,
107 p_vout_thread_t p_vout, p_aout_thread_t p_aout, int *pi_status )
109 input_thread_t * p_input; /* thread descriptor */
110 int i_status; /* thread status */
111 int i_index; /* index for tables initialization */
113 /* Allocate descriptor */
115 p_input = (input_thread_t *)malloc( sizeof(input_thread_t) );
116 if( p_input == NULL )
118 intf_ErrMsg("error: %s\n", strerror(ENOMEM));
122 /* Initialize thread properties */
124 p_input->b_error = 0;
125 p_input->pi_status = (pi_status != NULL) ? pi_status : &i_status;
126 *p_input->pi_status = THREAD_CREATE;
128 /* Initialize input method description */
129 p_input->i_method = i_method;
130 p_input->psz_source = psz_source;
131 p_input->i_port = i_port;
132 p_input->i_vlan = i_vlan;
135 case INPUT_METHOD_TS_FILE: /* file methods */
136 p_input->p_Open = input_FileOpen;
137 p_input->p_Read = input_FileRead;
138 p_input->p_Close = input_FileClose;
140 case INPUT_METHOD_TS_VLAN_BCAST: /* vlan network method */
141 if( !p_main->b_vlans )
143 intf_ErrMsg("error: vlans are not activated\n");
147 /* ... pass through */
148 case INPUT_METHOD_TS_UCAST: /* network methods */
149 case INPUT_METHOD_TS_MCAST:
150 case INPUT_METHOD_TS_BCAST:
151 p_input->p_Open = input_NetworkOpen;
152 p_input->p_Read = input_NetworkRead;
153 p_input->p_Close = input_NetworkClose;
156 intf_ErrMsg("error: unknow input method\n");
162 /* Initialize stream description */
163 for( i_index = 0; i_index < INPUT_MAX_ES; i_index++ )
165 p_input->p_es[i_index].i_id = EMPTY_PID;
166 p_input->pp_selected_es[i_index] = NULL;
169 /* Initialize default settings for spawned decoders */
170 p_input->p_aout = p_aout;
171 p_input->p_vout = p_vout;
174 /* Initialize statistics */
175 p_input->c_loops = 0;
176 p_input->c_bytes = 0;
177 p_input->c_payload_bytes = 0;
178 p_input->c_packets_read = 0;
179 p_input->c_packets_trashed = 0;
182 /* Initialize PSI and PCR decoders */
183 if( input_PsiInit( p_input ) )
189 if( input_PcrInit( p_input ) )
191 input_PsiEnd( p_input );
196 /* Initialize netlists */
197 if( input_NetlistInit( p_input ) )
199 input_PsiEnd( p_input );
200 input_PcrEnd( p_input );
205 intf_DbgMsg("configuration: method=%d, source=%s, port=%d, vlan=%d\n",
206 i_method, psz_source, i_port, i_vlan );
208 /* Let the appropriate method open the socket. */
209 if( p_input->p_Open( p_input ) )
211 input_NetlistEnd( p_input );
212 input_PsiEnd( p_input );
213 input_PcrEnd( p_input );
218 /* Create thread and set locks. */
219 vlc_mutex_init( &p_input->netlist.lock );
220 vlc_mutex_init( &p_input->programs_lock );
221 vlc_mutex_init( &p_input->es_lock );
222 if( vlc_thread_create(&p_input->thread_id, "input", (void *) RunThread, (void *) p_input) )
224 intf_ErrMsg("error: %s\n", strerror(errno) );
225 p_input->p_Close( p_input );
226 input_NetlistEnd( p_input );;
227 input_PsiEnd( p_input );
228 input_PcrEnd( p_input );
233 intf_Msg("Input initialized\n");
235 /* If status is NULL, wait until the thread is created */
236 if( pi_status == NULL )
240 msleep( THREAD_SLEEP );
241 }while( (i_status != THREAD_READY) && (i_status != THREAD_ERROR)
242 && (i_status != THREAD_FATAL) );
243 if( i_status != THREAD_READY )
251 /*****************************************************************************
252 * input_DestroyThread: mark an input thread as zombie
253 *****************************************************************************
254 * This function should not return until the thread is effectively cancelled.
255 *****************************************************************************/
256 void input_DestroyThread( input_thread_t *p_input, int *pi_status )
258 int i_status; /* thread status */
261 p_input->pi_status = (pi_status != NULL) ? pi_status : &i_status;
262 *p_input->pi_status = THREAD_DESTROY;
264 /* Request thread destruction */
267 /* If status is NULL, wait until thread has been destroyed */
268 if( pi_status == NULL )
272 msleep( THREAD_SLEEP );
273 }while( (i_status != THREAD_OVER) && (i_status != THREAD_ERROR)
274 && (i_status != THREAD_FATAL) );
279 /*****************************************************************************
280 * input_OpenAudioStream: open an audio stream
281 *****************************************************************************
282 * This function spawns an audio decoder and plugs it on the audio output
284 *****************************************************************************/
285 int input_OpenAudioStream( input_thread_t *p_input, int i_id )
290 /*****************************************************************************
291 * input_CloseAudioStream: close an audio stream
292 *****************************************************************************
293 * This function destroys an audio decoder.
294 *****************************************************************************/
295 void input_CloseAudioStream( input_thread_t *p_input, int i_id )
300 /*****************************************************************************
301 * input_OpenVideoStream: open a video stream
302 *****************************************************************************
303 * This function spawns a video decoder and plugs it on a video output thread.
304 *****************************************************************************/
305 int input_OpenVideoStream( input_thread_t *p_input,
306 struct vout_thread_s *p_vout, struct video_cfg_s * p_cfg )
311 /*****************************************************************************
312 * input_CloseVideoStream: close a video stream
313 *****************************************************************************
314 * This function destroys an video decoder.
315 *****************************************************************************/
316 void input_CloseVideoStream( input_thread_t *p_input, int i_id )
322 /* following functions are local */
324 /*****************************************************************************
325 * InitThread: initialize input thread
326 *****************************************************************************
327 * This function is called from RunThread and performs the second step of the
328 * initialization. It returns 0 on success. Note that the thread's flag are not
329 * modified inside this function.
330 *****************************************************************************/
331 static int InitThread( input_thread_t *p_input )
333 /* Mark thread as running and return */
335 *p_input->pi_status = THREAD_READY;
336 intf_DbgMsg("thread ready\n");
340 /*****************************************************************************
341 * RunThread: main thread loop
342 *****************************************************************************
343 * Thread in charge of processing the network packets and demultiplexing.
344 *****************************************************************************/
345 static void RunThread( input_thread_t *p_input )
348 * Initialize thread and free configuration
350 p_input->b_error = InitThread( p_input );
351 if( p_input->b_error )
353 free( p_input ); /* destroy descriptor */
361 while( !p_input->b_die && !p_input->b_error )
363 /* Scatter read the UDP packet from the network or the file. */
364 if( (input_ReadPacket( p_input )) == (-1) )
366 /* FIXME??: Normally, a thread can't kill itself, but we don't have
367 * any method in case of an error condition ... */
368 p_input->b_error = 1;
379 if( p_input->b_error )
381 ErrorThread( p_input );
385 EndThread( p_input );
386 intf_DbgMsg("thread end\n");
390 /*****************************************************************************
391 * ErrorThread: RunThread() error loop
392 *****************************************************************************
393 * This function is called when an error occured during thread main's loop.
394 *****************************************************************************/
395 static void ErrorThread( input_thread_t *p_input )
397 /* Wait until a `die' order */
399 while( !p_input->b_die )
402 msleep( VOUT_IDLE_SLEEP );
406 /*****************************************************************************
407 * EndThread: end the input thread
408 *****************************************************************************/
409 static void EndThread( input_thread_t * p_input )
411 int * pi_status; /* threas status */
412 int i_es_loop; /* es index */
416 pi_status = p_input->pi_status;
417 *pi_status = THREAD_END;
419 /* Close input method */
420 p_input->p_Close( p_input );
422 /* Destroy all decoder threads */
424 (i_es_loop < INPUT_MAX_ES) && (p_input->pp_selected_es[i_es_loop] != NULL) ;
427 switch( p_input->pp_selected_es[i_es_loop]->i_type )
432 vdec_DestroyThread( (vdec_thread_t*)(p_input->pp_selected_es[i_es_loop]->p_dec) /*, NULL */ );
434 vpar_DestroyThread( (vpar_thread_t*)(p_input->pp_selected_es[i_es_loop]->p_dec) /*, NULL */ );
439 adec_DestroyThread( (adec_thread_t*)(p_input->pp_selected_es[i_es_loop]->p_dec) );
442 ac3dec_DestroyThread( (ac3dec_thread_t *)(p_input->pp_selected_es[i_es_loop]->p_dec) );
445 spudec_DestroyThread( (spudec_thread_t *)(p_input->pp_selected_es[i_es_loop]->p_dec) );
448 /* Special streams for the PSI decoder, PID 0 and 1 */
452 intf_DbgMsg("error: unknown decoder type %d\n", p_input->pp_selected_es[i_es_loop]->i_type );
458 input_NetlistEnd( p_input ); /* clean netlist */
459 input_PsiEnd( p_input ); /* clean PSI information */
460 input_PcrEnd( p_input ); /* clean PCR information */
461 free( p_input ); /* free input_thread structure */
464 *pi_status = THREAD_OVER;
467 /*****************************************************************************
468 * input_ReadPacket: reads a packet from the network or the file
469 *****************************************************************************/
470 static __inline__ int input_ReadPacket( input_thread_t *p_input )
472 int i_base_index; /* index of the first free iovec */
475 #ifdef INPUT_LIFO_TS_NETLIST
476 int i_meanwhile_released;
477 int i_currently_removed;
479 ts_packet_t * p_ts_packet;
481 /* In this function, we only care about the TS netlist. PES netlist
482 * is for the demultiplexer. */
483 #ifdef INPUT_LIFO_TS_NETLIST
484 i_base_index = p_input->netlist.i_ts_index;
486 /* Verify that we still have packets in the TS netlist */
487 if( (INPUT_MAX_TS + INPUT_TS_READ_ONCE - 1 - p_input->netlist.i_ts_index) <= INPUT_TS_READ_ONCE )
489 intf_ErrMsg("input error: TS netlist is empty !\n");
493 #else /* FIFO netlist */
494 i_base_index = p_input->netlist.i_ts_start;
495 if( p_input->netlist.i_ts_start + INPUT_TS_READ_ONCE -1 > INPUT_MAX_TS )
497 /* The netlist is splitted in 2 parts. We must gather them to consolidate
498 the FIFO (we make the loop easily in having the same iovec at the far
499 end and in the beginning of netlist_free).
500 That's why the netlist is (INPUT_MAX_TS +1) + (INPUT_TS_READ_ONCE -1)
502 memcpy( p_input->netlist.p_ts_free + INPUT_MAX_TS + 1,
503 p_input->netlist.p_ts_free,
504 (p_input->netlist.i_ts_start + INPUT_TS_READ_ONCE - 1 - INPUT_MAX_TS)
505 * sizeof(struct iovec) );
508 /* Verify that we still have packets in the TS netlist */
509 if( ((p_input->netlist.i_ts_end -1 - p_input->netlist.i_ts_start) & INPUT_MAX_TS) <= INPUT_TS_READ_ONCE )
511 intf_ErrMsg("input error: TS netlist is empty !\n");
514 #endif /* FIFO netlist */
516 /* Scatter read the buffer. */
517 i_packet_size = (*p_input->p_Read)( p_input,
518 &p_input->netlist.p_ts_free[i_base_index],
519 INPUT_TS_READ_ONCE );
520 if( i_packet_size == (-1) )
523 intf_DbgMsg("Read packet %d %p %d %d\n", i_base_index,
524 &p_input->netlist.p_ts_free[i_base_index],
525 p_input->netlist.i_ts_start,
526 p_input->netlist.i_ts_end);
528 intf_ErrMsg("input error: readv() failed (%s)\n", strerror(errno));
532 if( i_packet_size == 0 )
534 /* No packet has been received, so stop here. */
538 /* Demultiplex the TS packets (1..INPUT_TS_READ_ONCE) received. */
539 for( i_current_index = i_base_index;
540 (i_packet_size -= TS_PACKET_SIZE) >= 0;
543 /* BTW, something REALLY bad could happen if we receive packets with
545 p_ts_packet = (ts_packet_t*)(p_input->netlist.p_ts_free[i_current_index].iov_base);
546 /* Don't cry :-), we are allowed to do that cast, because initially,
547 our buffer was malloc'ed with sizeof(ts_packet_t) */
549 /* Find out if we need this packet and demultiplex. */
550 input_SortPacket( p_input /* for current PIDs and netlist */,
554 if( i_packet_size > 0 )
556 intf_ErrMsg("input error: wrong size\n");
560 /* Remove the TS packets we have just filled from the netlist */
561 #ifdef INPUT_LIFO_TS_NETLIST
562 /* We need to take a lock here while we're calculating index positions. */
563 vlc_mutex_lock( &p_input->netlist.lock );
565 i_meanwhile_released = i_base_index - p_input->netlist.i_ts_index;
566 if( i_meanwhile_released )
568 /* That's where it becomes funny :-). Since we didn't take locks for
569 efficiency reasons, other threads (including ourselves, with
570 input_DemuxPacket) might have released packets to the netlist.
571 So we have to copy these iovec where they should go.
573 BTW, that explains why the TS netlist is
574 (INPUT_MAX_TS +1) + (TS_READ_ONCE -1) large. */
576 i_currently_removed = i_current_index - i_base_index;
577 if( i_meanwhile_released < i_currently_removed )
579 /* Copy all iovecs in that case */
580 memcpy( &p_input->netlist.p_ts_free[p_input->netlist.i_ts_index]
581 + i_currently_removed,
582 &p_input->netlist.p_ts_free[p_input->netlist.i_ts_index],
583 i_meanwhile_released * sizeof(struct iovec) );
587 /* We have fewer places than items, so we only move
588 i_currently_removed of them. */
589 memcpy( &p_input->netlist.p_ts_free[i_base_index],
590 &p_input->netlist.p_ts_free[p_input->netlist.i_ts_index],
591 i_currently_removed * sizeof(struct iovec) );
594 /* Update i_netlist_index with the information gathered above. */
595 p_input->netlist.i_ts_index += i_currently_removed;
599 /* Nothing happened. */
600 p_input->netlist.i_ts_index = i_current_index;
603 vlc_mutex_unlock( &p_input->netlist.lock );
605 #else /* FIFO netlist */
606 /* & is modulo ; that's where we make the loop. */
607 p_input->netlist.i_ts_start = i_current_index & INPUT_MAX_TS;
611 p_input->c_packets_read += i_current_index - i_base_index;
612 p_input->c_bytes += (i_current_index - i_base_index) * TS_PACKET_SIZE;
617 /*****************************************************************************
618 * input_SortPacket: find out whether we need that packet
619 *****************************************************************************/
620 static __inline__ void input_SortPacket( input_thread_t *p_input,
621 ts_packet_t *p_ts_packet )
626 /* Verify that sync_byte, error_indicator and scrambling_control are
628 if( !(p_ts_packet->buffer[0] == 0x47) || (p_ts_packet->buffer[1] & 0x80) ||
629 (p_ts_packet->buffer[3] & 0xc0) )
631 intf_DbgMsg("input debug: invalid TS header (%p)\n", p_ts_packet);
635 /* Get the PID of the packet. Note that ntohs is needed, for endianness
636 purposes (see man page). */
637 i_current_pid = U16_AT(&p_ts_packet->buffer[1]) & 0x1fff;
639 //intf_DbgMsg("input debug: pid %d received (%p)\n",
640 // i_current_pid, p_ts_packet);
642 /* Lock current ES state. */
643 vlc_mutex_lock( &p_input->es_lock );
645 /* Verify that we actually want this PID. */
646 for( i_es_loop = 0; i_es_loop < INPUT_MAX_SELECTED_ES; i_es_loop++ )
648 if( p_input->pp_selected_es[i_es_loop] != NULL)
650 if( (*p_input->pp_selected_es[i_es_loop]).i_id
653 /* Don't need the lock anymore, since the value pointed
654 out by p_input->pp_selected_es[i_es_loop] can only be
655 modified from inside the input_thread (by the PSI
656 decoder): interface thread is only allowed to modify
657 the pp_selected_es table */
658 vlc_mutex_unlock( &p_input->es_lock );
660 /* We're interested. Pass it to the demultiplexer. */
661 input_DemuxTS( p_input, p_ts_packet,
662 p_input->pp_selected_es[i_es_loop] );
668 /* pp_selected_es should not contain any hole. */
672 vlc_mutex_unlock( &p_input->es_lock );
675 /* We weren't interested in receiving this packet. Give it back to the
677 //intf_DbgMsg("SortPacket: freeing unwanted TS %p (pid %d)\n", p_ts_packet,
678 // U16_AT(&p_ts_packet->buffer[1]) & 0x1fff);
679 input_NetlistFreeTS( p_input, p_ts_packet );
681 p_input->c_packets_trashed++;
685 /*****************************************************************************
686 * input_DemuxTS: first step of demultiplexing: the TS header
687 *****************************************************************************
688 * Stream must also only contain PES and PSI, so PID must have been filtered
689 *****************************************************************************/
690 static __inline__ void input_DemuxTS( input_thread_t *p_input,
691 ts_packet_t *p_ts_packet,
692 es_descriptor_t *p_es_descriptor )
695 boolean_t b_adaption; /* Adaption field is present */
696 boolean_t b_payload; /* Packet carries payload */
697 boolean_t b_unit_start; /* A PSI or a PES start in the packet */
698 boolean_t b_trash = 0; /* Must the packet be trashed ? */
699 boolean_t b_lost = 0; /* Was there a packet lost ? */
703 ASSERT(p_es_descriptor);
705 #define p (p_ts_packet->buffer)
707 //intf_DbgMsg("input debug: TS-demultiplexing packet %p, pid %d, number %d\n",
708 // p_ts_packet, U16_AT(&p[1]) & 0x1fff, p[3] & 0x0f);
711 p_es_descriptor->c_packets++;
712 p_es_descriptor->c_bytes += TS_PACKET_SIZE;
715 /* Extract flags values from TS common header. */
716 b_unit_start = (p[1] & 0x40);
717 b_adaption = (p[3] & 0x20);
718 b_payload = (p[3] & 0x10);
720 /* Extract adaption field informations if any */
723 /* We don't have any adaptation_field, so payload start immediately
724 after the 4 byte TS header */
725 p_ts_packet->i_payload_start = 4;
729 /* p[4] is adaptation_field_length minus one */
730 p_ts_packet->i_payload_start = 5 + p[4];
732 /* The adaption field can be limited to the adaptation_field_length byte,
733 so that there is nothing to do: skip this possibility */
736 /* If the packet has both adaptation_field and payload, adaptation_field
737 cannot be more than 182 bytes long; if there is only an
738 adaptation_field, it must fill the next 183 bytes. */
739 if( b_payload ? (p[4] > 182) : (p[4] != 183) )
741 intf_DbgMsg("input debug: invalid TS adaptation field (%p)\n",
744 p_es_descriptor->c_invalid_packets++;
749 /* No we are sure that the byte containing flags is present: read it */
752 /* discontinuity_indicator */
755 intf_DbgMsg("discontinuity_indicator encountered by TS demux " \
756 "(position read: %d, saved: %d)\n", p[5] & 0x80,
757 p_es_descriptor->i_continuity_counter);
759 /* If the PID carries the PCR, there will be a system time-base
760 discontinuity. We let the PCR decoder handle that. */
761 p_es_descriptor->b_discontinuity = 1;
763 /* There also may be a continuity_counter discontinuity:
764 resynchronise our counter with the one of the stream */
765 p_es_descriptor->i_continuity_counter = (p[3] & 0x0f) - 1;
768 /* random_access_indicator */
769 p_es_descriptor->b_random |= p[5] & 0x40;
771 /* If this is a PCR_PID, and this TS packet contains a PCR,
772 we pass it along to the PCR decoder. */
773 if( (p_es_descriptor->b_pcr) && (p[5] & 0x10) )
775 /* There should be a PCR field in the packet, check if the
776 adaption field is long enough to carry it */
779 /* Call the PCR decoder */
780 input_PcrDecode( p_input, p_es_descriptor, &p[6] );
787 /* Check the continuity of the stream. */
788 i_dummy = ((p[3] & 0x0f) - p_es_descriptor->i_continuity_counter) & 0x0f;
791 /* Everything is ok, just increase our counter */
792 p_es_descriptor->i_continuity_counter++;
796 if( !b_payload && i_dummy == 0 )
798 /* This is a packet without payload, this is allowed by the draft
799 As there is nothing interessant in this packet (except PCR that
800 have already been handled), we can trash the packet. */
801 intf_DbgMsg("Packet without payload received by TS demux\n");
804 else if( i_dummy <= 0 )
806 /* Duplicate packet: mark it as being to be trashed. */
807 intf_DbgMsg("Duplicate packet received by TS demux\n");
810 else if( p_es_descriptor->i_continuity_counter == 0xFF )
812 /* This means that the packet is the first one we receive for this
813 ES since the continuity counter ranges between 0 and 0x0F
814 excepts when it has been initialized by the input: Init the
815 counter to the correct value. */
816 intf_DbgMsg("First packet for PID %d received by TS demux\n",
817 p_es_descriptor->i_id);
818 p_es_descriptor->i_continuity_counter = (p[3] & 0x0f);
822 /* This can indicate that we missed a packet or that the
823 continuity_counter wrapped and we received a dup packet: as we
824 don't know, do as if we missed a packet to be sure to recover
825 from this situation */
826 intf_DbgMsg("Packet lost by TS demux: current %d, packet %d\n",
827 p_es_descriptor->i_continuity_counter & 0x0f,
830 p_es_descriptor->i_continuity_counter = p[3] & 0x0f;
834 /* Trash the packet if it has no payload or if it is bad */
837 input_NetlistFreeTS( p_input, p_ts_packet );
839 p_input->c_packets_trashed++;
844 if( p_es_descriptor->b_psi )
846 /* The payload contains PSI tables */
847 input_DemuxPSI( p_input, p_ts_packet, p_es_descriptor,
848 b_unit_start, b_lost );
852 /* The payload carries a PES stream */
853 input_DemuxPES( p_input, p_ts_packet, p_es_descriptor,
854 b_unit_start, b_lost );
864 /*****************************************************************************
866 *****************************************************************************
867 * Gather a PES packet and analyzes its header.
868 *****************************************************************************/
869 static __inline__ void input_DemuxPES( input_thread_t *p_input,
870 ts_packet_t *p_ts_packet,
871 es_descriptor_t *p_es_descriptor,
872 boolean_t b_unit_start,
873 boolean_t b_packet_lost )
875 decoder_fifo_t * p_fifo;
876 u8 i_pes_header_size;
878 pes_packet_t* p_last_pes;
880 int i_ts_payload_size;
883 #define p_pes (p_es_descriptor->p_pes_packet)
887 ASSERT(p_es_descriptor);
889 //intf_DbgMsg("PES-demultiplexing %p (%p)\n", p_ts_packet, p_pes);
891 /* If we lost data, discard the PES packet we are trying to reassemble
892 if any and wait for the beginning of a new one in order to synchronise
894 if( b_packet_lost && p_pes != NULL )
896 intf_DbgMsg("PES %p trashed because of packet lost\n", p_pes);
897 input_NetlistFreePES( p_input, p_pes );
901 /* If the TS packet contains the begining of a new PES packet, and if we
902 were reassembling a PES packet, then the PES should be complete now,
903 so parse its header and give it to the decoders */
904 if( b_unit_start && p_pes != NULL )
906 //intf_DbgMsg("End of PES packet %p\n", p_pes);
908 /* Parse the header. The header has a variable length, but in order
909 to improve the algorithm, we will read the 14 bytes we may be
911 p_ts = p_pes->p_first_ts;
912 i_ts_payload_size = p_ts->i_payload_end - p_ts->i_payload_start;
915 if(i_ts_payload_size >= PES_HEADER_SIZE)
917 /* This part of the header entirely fits in the payload of
918 the first TS packet */
919 p_pes->p_pes_header = &(p_ts->buffer[p_ts->i_payload_start]);
923 /* This part of the header does not fit in the current TS packet:
924 copy the part of the header we are interested in to the
925 p_pes_header_save buffer. The buffer is dynamicly allocated if
926 needed so it's time expensive but this situation almost never occur. */
927 intf_DbgMsg("Code never tested encountered, WARNING ! (benny)\n");
928 if( !p_pes->p_pes_header_save )
930 p_pes->p_pes_header_save = malloc(PES_HEADER_SIZE);
935 memcpy(p_pes->p_pes_header_save + i_dummy,
936 &p_ts->buffer[p_ts->i_payload_start], i_ts_payload_size);
937 i_dummy += i_ts_payload_size;
939 p_ts = p_ts->p_next_ts;
942 /* The payload of the PES packet is shorter than the 14 bytes
943 we would read. This means that high packet lost occured
944 so the PES won't be usefull for any decoder. Moreover,
945 this should never happen so we can trash the packet and
946 exit roughly without regrets */
947 intf_DbgMsg("PES packet too short: trashed\n");
948 input_NetlistFreePES( p_input, p_pes );
954 i_ts_payload_size = p_ts->i_payload_end - p_ts->i_payload_start;
956 while(i_ts_payload_size + i_dummy < PES_HEADER_SIZE);
958 /* This last TS packet is partly header, partly payload, so just
959 copy the header part */
960 memcpy(p_pes->p_pes_header_save + i_dummy,
961 &p_ts->buffer[p_ts->i_payload_start],
962 PES_HEADER_SIZE - i_dummy);
964 /* The header must be read in the buffer not in any TS packet */
965 p_pes->p_pes_header = p_pes->p_pes_header_save;
968 /* Now we have the part of the PES header we were interested in:
971 /* First read the 6 header bytes common to all PES packets:
972 use them to test the PES validity */
973 if( (p_pes->p_pes_header[0] || p_pes->p_pes_header[1] ||
974 (p_pes->p_pes_header[2] != 1)) ||
975 /* packet_start_code_prefix != 0x000001 */
976 ((i_dummy = U16_AT(p_pes->p_pes_header + 4)) &&
977 (i_dummy + 6 != p_pes->i_pes_size)) )
978 /* PES_packet_length is set and != total received payload */
980 /* Trash the packet and set p_pes to NULL to be sure the next PES
981 packet will have its b_data_lost flag set */
982 intf_DbgMsg("Corrupted PES packet received: trashed\n");
983 input_NetlistFreePES( p_input, p_pes );
989 /* The PES packet is valid. Check its type to test if it may
990 carry additional informations in a header extension */
991 p_pes->i_stream_id = p_pes->p_pes_header[3];
993 switch( p_pes->i_stream_id )
995 case 0xBE: /* Padding */
996 case 0xBC: /* Program stream map */
997 case 0xBF: /* Private stream 2 */
1000 case 0xFF: /* Program stream directory */
1001 case 0xF2: /* DSMCC stream */
1002 case 0xF8: /* ITU-T H.222.1 type E stream */
1003 /* The payload begins immediatly after the 6 bytes header, so
1004 we have finished with the parsing */
1005 i_pes_header_size = 6;
1009 /* The PES header contains at least 3 more bytes: parse them */
1010 p_pes->b_data_alignment = p_pes->p_pes_header[6] & 0x04;
1011 p_pes->b_has_pts = p_pes->p_pes_header[7] & 0x80;
1012 i_pes_header_size = p_pes->p_pes_header[8] + 9;
1014 /* Now parse the optional header extensions (in the limit of
1016 if( p_pes->b_has_pts )
1018 pcr_descriptor_t * p_pcr;
1020 p_pcr = p_input->p_pcr;
1023 ( ((mtime_t)(p_pes->p_pes_header[9] & 0x0E) << 29) |
1024 (((mtime_t)U16_AT(p_pes->p_pes_header + 10) << 14) - (1 << 14)) |
1025 ((mtime_t)U16_AT(p_pes->p_pes_header + 12) >> 1) ) * 300;
1028 if( p_pcr->i_synchro_state )
1030 switch( p_pcr->i_synchro_state )
1032 case SYNCHRO_NOT_STARTED:
1033 p_pes->b_has_pts = 0;
1037 p_pes->i_pts += p_pcr->delta_pcr;
1038 p_pcr->delta_absolute = mdate() - p_pes->i_pts + INPUT_PTS_DELAY;
1039 p_pes->i_pts += p_pcr->delta_absolute;
1040 p_pcr->i_synchro_state = 0;
1043 case SYNCHRO_REINIT: /* We skip a PES */
1044 p_pes->b_has_pts = 0;
1045 p_pcr->i_synchro_state = SYNCHRO_START;
1051 p_pes->i_pts += p_pcr->delta_pcr + p_pcr->delta_absolute;
1057 /* Now we've parsed the header, we just have to indicate in some
1058 specific TS packets where the PES payload begins (renumber
1059 i_payload_start), so that the decoders can find the beginning
1060 of their data right out of the box. */
1061 p_ts = p_pes->p_first_ts;
1062 i_ts_payload_size = p_ts->i_payload_end - p_ts->i_payload_start;
1063 while( i_pes_header_size > i_ts_payload_size )
1065 /* These packets are entirely filled by the PES header. */
1066 i_pes_header_size -= i_ts_payload_size;
1067 p_ts->i_payload_start = p_ts->i_payload_end;
1068 /* Go to the next TS packet: here we won't have to test it is
1069 not NULL because we trash the PES packets when packet lost
1071 p_ts = p_ts->p_next_ts;
1072 i_ts_payload_size = p_ts->i_payload_end - p_ts->i_payload_start;
1074 /* This last packet is partly header, partly payload. */
1075 p_ts->i_payload_start += i_pes_header_size;
1078 /* Now we can eventually put the PES packet in the decoder's
1080 switch( p_es_descriptor->i_type )
1082 case MPEG1_VIDEO_ES:
1083 case MPEG2_VIDEO_ES:
1085 p_fifo = &(((vdec_thread_t*)(p_es_descriptor->p_dec))->fifo);
1087 p_fifo = &(((vpar_thread_t*)(p_es_descriptor->p_dec))->fifo);
1091 case MPEG1_AUDIO_ES:
1092 case MPEG2_AUDIO_ES:
1093 p_fifo = &(((adec_thread_t*)(p_es_descriptor->p_dec))->fifo);
1098 /* we skip 4 bytes at the beginning of the AC3 payload */
1099 p_ts->i_payload_start += 4;
1101 p_fifo = &(((ac3dec_thread_t *)(p_es_descriptor->p_dec))->fifo);
1105 /* we skip 4 bytes at the beginning of the subpicture payload */
1106 p_ts->i_payload_start += 4;
1107 p_fifo = &(((spudec_thread_t *)(p_es_descriptor->p_dec))->fifo);
1111 /* This should never happen */
1112 intf_DbgMsg("Unknown stream type (%d, %d): PES trashed\n",
1113 p_es_descriptor->i_id, p_es_descriptor->i_type);
1118 if( p_fifo != NULL )
1120 vlc_mutex_lock( &p_fifo->data_lock );
1121 if( DECODER_FIFO_ISFULL( *p_fifo ) )
1123 /* The FIFO is full !!! This should not happen. */
1125 p_input->c_packets_trashed += p_pes->i_ts_packets;
1126 p_es_descriptor->c_invalid_packets += p_pes->i_ts_packets;
1128 input_NetlistFreePES( p_input, p_pes );
1129 intf_DbgMsg("PES trashed - fifo full ! (%d, %d)\n",
1130 p_es_descriptor->i_id, p_es_descriptor->i_type);
1134 //intf_DbgMsg("Putting %p into fifo %p/%d\n",
1135 // p_pes, p_fifo, p_fifo->i_end);
1136 p_fifo->buffer[p_fifo->i_end] = p_pes;
1137 DECODER_FIFO_INCEND( *p_fifo );
1139 /* Warn the decoder that it's got work to do. */
1140 vlc_cond_signal( &p_fifo->data_wait );
1142 vlc_mutex_unlock( &p_fifo->data_lock );
1146 intf_DbgMsg("No fifo to receive PES %p: trash\n", p_pes);
1148 p_input->c_packets_trashed += p_pes->i_ts_packets;
1149 p_es_descriptor->c_invalid_packets += p_pes->i_ts_packets;
1151 input_NetlistFreePES( p_input, p_pes );
1157 /* If we are at the beginning of a new PES packet, we must fetch a new
1158 PES buffer to begin with the reassembly of this PES packet. This is
1159 also here that we can synchronise with the stream if we we lost
1160 packets or if the decoder has just started */
1165 /* Get a new one PES from the PES netlist. */
1166 if( (p_pes = input_NetlistGetPES( p_input )) == (NULL) )
1168 /* PES netlist is empty ! */
1169 p_input->b_error = 1;
1173 //intf_DbgMsg("New PES packet %p (first TS: %p)\n", p_pes, p_ts_packet);
1175 /* Init the PES fields so that the first TS packet could be correctly
1176 added to the PES packet (see below) */
1177 p_pes->p_first_ts = p_ts_packet;
1178 p_pes->p_last_ts = NULL;
1180 /* If the last pes packet was null, this means that the synchronisation
1181 was lost and so warn the decoder that he will have to find a way to
1184 p_pes->b_data_loss = 1;
1186 /* Read the b_random_access flag status and then reinit it */
1187 p_pes->b_random_access = p_es_descriptor->b_random;
1188 p_es_descriptor->b_random = 0;
1193 /* If we are synchronised with the stream, and so if we are ready to
1194 receive correctly the data, add the TS packet to the current PES
1198 //intf_DbgMsg("Adding TS %p to PES %p\n", p_ts_packet, p_pes);
1200 /* Size of the payload carried in the TS packet */
1201 i_ts_payload_size = p_ts_packet->i_payload_end -
1202 p_ts_packet->i_payload_start;
1204 /* Update the relations between the TS packets */
1205 p_ts_packet->p_prev_ts = p_pes->p_last_ts;
1206 p_ts_packet->p_next_ts = NULL;
1207 if( p_pes->i_ts_packets != 0 )
1209 /* Regarder si il serait pas plus efficace de ne creer que les liens
1210 precedent->suivant pour le moment, et les liens suivant->precedent
1211 quand le paquet est termine */
1212 /* Otherwise it is the first TS packet. */
1213 p_pes->p_last_ts->p_next_ts = p_ts_packet;
1215 /* Now add the TS to the PES packet */
1216 p_pes->p_last_ts = p_ts_packet;
1217 p_pes->i_ts_packets++;
1218 p_pes->i_pes_size += i_ts_payload_size;
1222 i_dummy = p_ts_packet->i_payload_end - p_ts_packet->i_payload_start;
1223 p_es_descriptor->c_payload_bytes += i_dummy;
1228 /* Since we don't use the TS packet to build a PES packet, we don't
1229 need it anymore, so give it back to the netlist */
1230 //intf_DbgMsg("Trashing TS %p: no PES being build\n", p_ts_packet);
1231 input_NetlistFreeTS( p_input, p_ts_packet );
1240 /*****************************************************************************
1242 *****************************************************************************
1243 * Notice that current ES state has been locked by input_SortPacket. (No more true,
1244 * changed by benny - FIXME: See if it's ok, and definitely change the code ?? )
1245 *****************************************************************************/
1246 static __inline__ void input_DemuxPSI( input_thread_t *p_input,
1247 ts_packet_t *p_ts_packet,
1248 es_descriptor_t *p_es_descriptor,
1249 boolean_t b_unit_start, boolean_t b_packet_lost )
1251 int i_data_offset; /* Offset of the interesting data in the TS packet */
1252 u16 i_data_length; /* Length of those data */
1253 //boolean_t b_first_section; /* Was there another section in the TS packet ? */
1256 ASSERT(p_ts_packet);
1257 ASSERT(p_es_descriptor);
1259 #define p_psi (p_es_descriptor->p_psi_section)
1261 //intf_DbgMsg( "input debug: PSI demultiplexing %p (%p)\n", p_ts_packet, p_input);
1263 //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);
1266 /* Try to find the beginning of the payload in the packet to initialise
1267 the do-while loop that follows -> Compute the i_data_offset variable:
1268 by default, the value is set so that we won't enter in the while loop.
1269 It will be set to a correct value if the data are not corrupted */
1270 i_data_offset = TS_PACKET_SIZE;
1272 /* Has the reassembly of a section already began in a previous packet ? */
1273 if( p_psi->b_running_section )
1275 /* Was data lost since the last TS packet ? */
1278 /* Discard the packet and wait for the begining of a new one to resynch */
1279 p_psi->b_running_section = 0;
1280 p_psi->i_current_position = 0;
1281 intf_DbgMsg( "PSI section(s) discarded due to packet loss\n" );
1285 /* The data that complete a previously began section are always at
1286 the beginning of the TS payload... */
1287 i_data_offset = p_ts_packet->i_payload_start;
1288 /* ...Unless there is a pointer field, that we have to bypass */
1291 //intf_DbgMsg( "New part of the section received at offset %d\n", i_data_offset );
1294 /* We are looking for the beginning of a new section */
1299 /* Get the offset at which the data for that section can be found
1300 The offset is stored in the pointer_field since we are interested in
1301 the first section of the TS packet. Note that the +1 is to bypass
1302 the pointer field */
1303 i_data_offset = p_ts_packet->i_payload_start +
1304 p_ts_packet->buffer[p_ts_packet->i_payload_start] + 1;
1305 //intf_DbgMsg( "New section beginning at offset %d in TS packet\n", i_data_offset );
1309 /* This may either mean that the TS is bad or that the packet contains
1310 the end of a section that had been discarded in a previous loop:
1311 trash the TS packet since we cannot do anything with those data: */
1312 p_psi->b_running_section = 0;
1313 p_psi->i_current_position = 0;
1314 intf_DbgMsg( "PSI packet discarded due to lack of synchronisation\n" );
1318 /* The section we will deal with during the first iteration of the following
1319 loop is the first one contained in the TS packet */
1320 // b_first_section = 1;
1322 /* Reassemble the pieces of sections contained in the TS packet and decode
1323 the sections that could have been completed.
1324 Stop when we reach the end of the packet or stuffing bytes */
1325 while( i_data_offset < TS_PACKET_SIZE && p_ts_packet->buffer[i_data_offset] != 0xFF )
1327 /* If the current section is a new one, reinit the data fields of the p_psi
1328 struct to start its decoding */
1329 if( !p_psi->b_running_section )
1331 /* Read the length of the new section */
1332 p_psi->i_length = (U16_AT(&p_ts_packet->buffer[i_data_offset+1]) & 0xFFF) + 3;
1333 //intf_DbgMsg( "Section length %d\n", p_psi->i_length );
1334 if( p_psi->i_length > PSI_SECTION_SIZE )
1336 /* The TS packet is corrupted, stop here to avoid possible a seg fault */
1337 intf_DbgMsg( "PSI Section size is too big, aborting its reception\n" );
1341 /* Init the reassembly of that section */
1342 p_psi->b_running_section = 1;
1343 p_psi->i_current_position = 0;
1346 /* Compute the length of data related to the section in this TS packet */
1347 if( p_psi->i_length - p_psi->i_current_position > TS_PACKET_SIZE - i_data_offset)
1348 i_data_length = TS_PACKET_SIZE - i_data_offset;
1350 i_data_length = p_psi->i_length - p_psi->i_current_position;
1352 /* Copy those data in the section buffer */
1353 memcpy( &p_psi->buffer[p_psi->i_current_position], &p_ts_packet->buffer[i_data_offset],
1356 /* Interesting data are now after the ones we copied, since no gap is
1357 allowed between 2 sections in a TS packets */
1358 i_data_offset += i_data_length;
1360 /* Decode the packet if it is now complete */
1361 if (p_psi->i_length == p_psi->i_current_position + i_data_length)
1363 /* Packet is complete, decode it */
1364 //intf_DbgMsg( "SECTION COMPLETE: starting decoding of its data\n" );
1365 input_PsiDecode( p_input, p_psi );
1367 /* Prepare the buffer to receive a new section */
1368 p_psi->i_current_position = 0;
1369 p_psi->b_running_section = 0;
1371 /* The new section won't be the first anymore */
1372 //b_first_section = 0;
1376 /* Prepare the buffer to receive the next part of the section */
1377 p_psi->i_current_position += i_data_length;
1378 //intf_DbgMsg( "Section not complete, waiting for the end\n" );
1381 //intf_DbgMsg( "Must loop ? Next data offset: %d, stuffing: %d\n",
1382 // i_data_offset, p_ts_packet->buffer[i_data_offset] );
1385 /* Relase the TS packet, we don't need it anymore */
1386 input_NetlistFreeTS( p_input, p_ts_packet );