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
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
23 *****************************************************************************/
25 /*****************************************************************************
27 *****************************************************************************/
30 #include <errno.h> /* errno */
31 #include <sys/types.h> /* on BSD, uio.h needs types.h */
32 #include <sys/uio.h> /* "input.h" */
33 #include <string.h> /* strerror() */
35 #include <stdlib.h> /* free() */
36 #include <netinet/in.h> /* ntohs() */
47 #include "input_psi.h"
48 #include "input_pcr.h"
49 #include "input_netlist.h"
50 #include "decoder_fifo.h"
51 #include "input_file.h"
52 #include "input_network.h"
54 #include "audio_output.h" /* aout_thread_t */
56 #include "audio_decoder.h" /* audiodec_t (for audio_decoder_thread.h) */
57 #include "audio_decoder_thread.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 "lpcm_decoder.h"
63 #include "lpcm_decoder_thread.h"
65 #include "video.h" /* picture_t (for video_output.h) */
66 #include "video_output.h" /* vout_thread_t */
68 #include "vdec_idct.h" /* dctelem_t (for video_parser.h) */
69 #include "vdec_motion.h" /* f_motion_t (for video_parser.h) */
70 #include "vpar_blocks.h" /* macroblock_t (for video_parser.h) */
71 #include "vpar_headers.h" /* sequence_t (for video_parser.h) */
72 #include "vpar_synchro.h" /* video_synchro_t (for video_parser.h) */
73 #include "video_parser.h" /* vpar_thread_t */
75 #include "spu_decoder.h" /* spudec_thread_t */
79 /*****************************************************************************
81 *****************************************************************************/
82 static void RunThread ( input_thread_t *p_input );
83 static void ErrorThread ( input_thread_t *p_input );
84 static void EndThread ( input_thread_t *p_input );
86 static __inline__ int input_ReadPacket( input_thread_t *p_input );
87 static __inline__ void input_SortPacket( input_thread_t *p_input,
88 ts_packet_t *ts_packet );
89 static __inline__ void input_DemuxTS( input_thread_t *p_input,
90 ts_packet_t *ts_packet,
91 es_descriptor_t *es_descriptor );
92 static __inline__ void input_DemuxPES( input_thread_t *p_input,
93 ts_packet_t *ts_packet,
94 es_descriptor_t *p_es_descriptor,
95 boolean_t b_unit_start, boolean_t b_packet_lost );
96 static __inline__ void input_ParsePES( input_thread_t *p_input,
97 es_descriptor_t *p_es_descriptor );
98 static __inline__ void input_DemuxPSI( input_thread_t *p_input,
99 ts_packet_t *ts_packet,
100 es_descriptor_t *p_es_descriptor,
101 boolean_t b_unit_start, boolean_t b_packet_lost );
103 /*****************************************************************************
104 * input_CreateThread: creates a new input thread
105 *****************************************************************************
106 * This function creates a new input, and returns a pointer
107 * to its description. On error, it returns NULL.
108 * If pi_status is NULL, then the function will block until the thread is ready.
109 * If not, it will be updated using one of the THREAD_* constants.
110 *****************************************************************************/
111 input_thread_t *input_CreateThread ( int i_method, char *psz_source, int i_port, int i_vlan,
112 p_vout_thread_t p_vout, p_aout_thread_t p_aout, int *pi_status )
114 input_thread_t * p_input; /* thread descriptor */
115 int i_status; /* thread status */
116 int i_index; /* index for tables initialization */
118 /* Allocate descriptor */
120 p_input = (input_thread_t *)malloc( sizeof(input_thread_t) );
121 if( p_input == NULL )
123 intf_ErrMsg("error: %s\n", strerror(ENOMEM));
127 /* Initialize thread properties */
129 p_input->b_error = 0;
130 p_input->pi_status = (pi_status != NULL) ? pi_status : &i_status;
131 *p_input->pi_status = THREAD_CREATE;
133 /* Initialize input method description */
134 p_input->i_method = i_method;
135 p_input->psz_source = psz_source;
136 p_input->i_port = i_port;
137 p_input->i_vlan = i_vlan;
140 case INPUT_METHOD_TS_FILE: /* file methods */
141 p_input->p_Open = input_FileOpen;
142 p_input->p_Read = input_FileRead;
143 p_input->p_Close = input_FileClose;
145 case INPUT_METHOD_TS_VLAN_BCAST: /* vlan network method */
146 if( !p_main->b_vlans )
148 intf_ErrMsg("error: vlans are not activated\n");
152 /* ... pass through */
153 case INPUT_METHOD_TS_UCAST: /* network methods */
154 case INPUT_METHOD_TS_MCAST:
155 case INPUT_METHOD_TS_BCAST:
156 p_input->p_Open = input_NetworkOpen;
157 p_input->p_Read = input_NetworkRead;
158 p_input->p_Close = input_NetworkClose;
161 intf_ErrMsg("error: unknow input method\n");
167 /* Initialize stream description */
168 for( i_index = 0; i_index < INPUT_MAX_ES; i_index++ )
170 p_input->p_es[i_index].i_id = EMPTY_PID;
171 p_input->pp_selected_es[i_index] = NULL;
174 /* Initialize default settings for spawned decoders */
175 p_input->p_aout = p_aout;
176 p_input->p_vout = p_vout;
179 /* Initialize statistics */
180 p_input->c_loops = 0;
181 p_input->c_bytes = 0;
182 p_input->c_payload_bytes = 0;
183 p_input->c_packets_read = 0;
184 p_input->c_packets_trashed = 0;
187 /* Initialize PSI and PCR decoders */
188 if( input_PsiInit( p_input ) )
194 if( input_PcrInit( p_input ) )
196 input_PsiEnd( p_input );
201 /* Initialize netlists */
202 if( input_NetlistInit( p_input ) )
204 input_PsiEnd( p_input );
205 input_PcrEnd( p_input );
210 intf_DbgMsg("configuration: method=%d, source=%s, port=%d, vlan=%d\n",
211 i_method, psz_source, i_port, i_vlan );
213 /* Let the appropriate method open the socket. */
214 if( p_input->p_Open( p_input ) )
216 input_NetlistEnd( p_input );
217 input_PsiEnd( p_input );
218 input_PcrEnd( p_input );
223 /* Create thread and set locks. */
224 vlc_mutex_init( &p_input->netlist.lock );
225 vlc_mutex_init( &p_input->programs_lock );
226 vlc_mutex_init( &p_input->es_lock );
227 if( vlc_thread_create(&p_input->thread_id, "input", (void *) RunThread, (void *) p_input) )
229 intf_ErrMsg("error: %s\n", strerror(errno) );
230 p_input->p_Close( p_input );
231 input_NetlistEnd( p_input );;
232 input_PsiEnd( p_input );
233 input_PcrEnd( p_input );
238 intf_Msg("Input initialized\n");
240 /* If status is NULL, wait until the thread is created */
241 if( pi_status == NULL )
245 msleep( THREAD_SLEEP );
246 }while( (i_status != THREAD_READY) && (i_status != THREAD_ERROR)
247 && (i_status != THREAD_FATAL) );
248 if( i_status != THREAD_READY )
256 /*****************************************************************************
257 * input_DestroyThread: mark an input thread as zombie
258 *****************************************************************************
259 * This function should not return until the thread is effectively cancelled.
260 *****************************************************************************/
261 void input_DestroyThread( input_thread_t *p_input, int *pi_status )
263 int i_status; /* thread status */
266 p_input->pi_status = (pi_status != NULL) ? pi_status : &i_status;
267 *p_input->pi_status = THREAD_DESTROY;
269 /* Request thread destruction */
272 /* If status is NULL, wait until thread has been destroyed */
273 if( pi_status == NULL )
277 msleep( THREAD_SLEEP );
278 }while( (i_status != THREAD_OVER) && (i_status != THREAD_ERROR)
279 && (i_status != THREAD_FATAL) );
284 /*****************************************************************************
285 * input_OpenAudioStream: open an audio stream
286 *****************************************************************************
287 * This function spawns an audio decoder and plugs it on the audio output
289 *****************************************************************************/
290 int input_OpenAudioStream( input_thread_t *p_input, int i_id )
295 /*****************************************************************************
296 * input_CloseAudioStream: close an audio stream
297 *****************************************************************************
298 * This function destroys an audio decoder.
299 *****************************************************************************/
300 void input_CloseAudioStream( input_thread_t *p_input, int i_id )
305 /*****************************************************************************
306 * input_OpenVideoStream: open a video stream
307 *****************************************************************************
308 * This function spawns a video decoder and plugs it on a video output thread.
309 *****************************************************************************/
310 int input_OpenVideoStream( input_thread_t *p_input,
311 struct vout_thread_s *p_vout, struct video_cfg_s * p_cfg )
316 /*****************************************************************************
317 * input_CloseVideoStream: close a video stream
318 *****************************************************************************
319 * This function destroys an video decoder.
320 *****************************************************************************/
321 void input_CloseVideoStream( input_thread_t *p_input, int i_id )
327 /* following functions are local */
329 /*****************************************************************************
330 * InitThread: initialize input thread
331 *****************************************************************************
332 * This function is called from RunThread and performs the second step of the
333 * initialization. It returns 0 on success. Note that the thread's flag are not
334 * modified inside this function.
335 *****************************************************************************/
336 static int InitThread( input_thread_t *p_input )
338 /* Mark thread as running and return */
340 *p_input->pi_status = THREAD_READY;
341 intf_DbgMsg("thread ready\n");
345 /*****************************************************************************
346 * RunThread: main thread loop
347 *****************************************************************************
348 * Thread in charge of processing the network packets and demultiplexing.
349 *****************************************************************************/
350 static void RunThread( input_thread_t *p_input )
353 * Initialize thread and free configuration
355 p_input->b_error = InitThread( p_input );
356 if( p_input->b_error )
358 free( p_input ); /* destroy descriptor */
366 while( !p_input->b_die && !p_input->b_error )
368 /* Scatter read the UDP packet from the network or the file. */
369 if( (input_ReadPacket( p_input )) == (-1) )
371 /* FIXME??: Normally, a thread can't kill itself, but we don't have
372 * any method in case of an error condition ... */
373 p_input->b_error = 1;
384 if( p_input->b_error )
386 ErrorThread( p_input );
390 EndThread( p_input );
391 intf_DbgMsg("thread end\n");
395 /*****************************************************************************
396 * ErrorThread: RunThread() error loop
397 *****************************************************************************
398 * This function is called when an error occured during thread main's loop.
399 *****************************************************************************/
400 static void ErrorThread( input_thread_t *p_input )
402 /* Wait until a `die' order */
404 while( !p_input->b_die )
407 msleep( VOUT_IDLE_SLEEP );
411 /*****************************************************************************
412 * EndThread: end the input thread
413 *****************************************************************************/
414 static void EndThread( input_thread_t * p_input )
416 int * pi_status; /* threas status */
417 int i_es_loop; /* es index */
421 pi_status = p_input->pi_status;
422 *pi_status = THREAD_END;
424 /* Close input method */
425 p_input->p_Close( p_input );
427 /* Destroy all decoder threads */
429 (i_es_loop < INPUT_MAX_ES) && (p_input->pp_selected_es[i_es_loop] != NULL) ;
432 switch( p_input->pp_selected_es[i_es_loop]->i_type )
437 vdec_DestroyThread( (vdec_thread_t*)(p_input->pp_selected_es[i_es_loop]->p_dec) /*, NULL */ );
439 vpar_DestroyThread( (vpar_thread_t*)(p_input->pp_selected_es[i_es_loop]->p_dec) /*, NULL */ );
444 adec_DestroyThread( (adec_thread_t*)(p_input->pp_selected_es[i_es_loop]->p_dec) );
447 ac3dec_DestroyThread( (ac3dec_thread_t *)(p_input->pp_selected_es[i_es_loop]->p_dec) );
450 lpcmdec_DestroyThread((lpcmdec_thread_t *)(p_input->pp_selected_es[i_es_loop]->p_dec) );
453 spudec_DestroyThread( (spudec_thread_t *)(p_input->pp_selected_es[i_es_loop]->p_dec) );
456 /* Special streams for the PSI decoder, PID 0 and 1 */
460 intf_DbgMsg("error: unknown decoder type %d\n", p_input->pp_selected_es[i_es_loop]->i_type );
466 input_NetlistEnd( p_input ); /* clean netlist */
467 input_PsiEnd( p_input ); /* clean PSI information */
468 input_PcrEnd( p_input ); /* clean PCR information */
469 free( p_input ); /* free input_thread structure */
472 *pi_status = THREAD_OVER;
475 /*****************************************************************************
476 * input_ReadPacket: reads a packet from the network or the file
477 *****************************************************************************/
478 static __inline__ int input_ReadPacket( input_thread_t *p_input )
480 int i_base_index; /* index of the first free iovec */
483 #ifdef INPUT_LIFO_TS_NETLIST
484 int i_meanwhile_released;
485 int i_currently_removed;
487 ts_packet_t * p_ts_packet;
489 /* In this function, we only care about the TS netlist. PES netlist
490 * is for the demultiplexer. */
491 #ifdef INPUT_LIFO_TS_NETLIST
492 i_base_index = p_input->netlist.i_ts_index;
494 /* Verify that we still have packets in the TS netlist */
495 if( (INPUT_MAX_TS + INPUT_TS_READ_ONCE - 1 - p_input->netlist.i_ts_index) <= INPUT_TS_READ_ONCE )
497 intf_ErrMsg("input error: TS netlist is empty !\n");
501 #else /* FIFO netlist */
502 i_base_index = p_input->netlist.i_ts_start;
503 if( p_input->netlist.i_ts_start + INPUT_TS_READ_ONCE -1 > INPUT_MAX_TS )
505 /* The netlist is splitted in 2 parts. We must gather them to consolidate
506 the FIFO (we make the loop easily in having the same iovec at the far
507 end and in the beginning of netlist_free).
508 That's why the netlist is (INPUT_MAX_TS +1) + (INPUT_TS_READ_ONCE -1)
510 memcpy( p_input->netlist.p_ts_free + INPUT_MAX_TS + 1,
511 p_input->netlist.p_ts_free,
512 (p_input->netlist.i_ts_start + INPUT_TS_READ_ONCE - 1 - INPUT_MAX_TS)
513 * sizeof(struct iovec) );
516 /* Verify that we still have packets in the TS netlist */
517 if( ((p_input->netlist.i_ts_end -1 - p_input->netlist.i_ts_start) & INPUT_MAX_TS) <= INPUT_TS_READ_ONCE )
519 intf_ErrMsg("input error: TS netlist is empty !\n");
522 #endif /* FIFO netlist */
524 /* Scatter read the buffer. */
525 i_packet_size = (*p_input->p_Read)( p_input,
526 &p_input->netlist.p_ts_free[i_base_index],
527 INPUT_TS_READ_ONCE );
528 if( i_packet_size == (-1) )
531 intf_DbgMsg("Read packet %d %p %d %d\n", i_base_index,
532 &p_input->netlist.p_ts_free[i_base_index],
533 p_input->netlist.i_ts_start,
534 p_input->netlist.i_ts_end);
536 intf_ErrMsg("input error: readv() failed (%s)\n", strerror(errno));
540 if( i_packet_size == 0 )
542 /* No packet has been received, so stop here. */
546 /* Demultiplex the TS packets (1..INPUT_TS_READ_ONCE) received. */
547 for( i_current_index = i_base_index;
548 (i_packet_size -= TS_PACKET_SIZE) >= 0;
551 /* BTW, something REALLY bad could happen if we receive packets with
553 p_ts_packet = (ts_packet_t*)(p_input->netlist.p_ts_free[i_current_index].iov_base);
554 /* Don't cry :-), we are allowed to do that cast, because initially,
555 our buffer was malloc'ed with sizeof(ts_packet_t) */
557 /* Find out if we need this packet and demultiplex. */
558 input_SortPacket( p_input /* for current PIDs and netlist */,
562 if( i_packet_size > 0 )
564 intf_ErrMsg("input error: wrong size\n");
568 /* Remove the TS packets we have just filled from the netlist */
569 #ifdef INPUT_LIFO_TS_NETLIST
570 /* We need to take a lock here while we're calculating index positions. */
571 vlc_mutex_lock( &p_input->netlist.lock );
573 i_meanwhile_released = i_base_index - p_input->netlist.i_ts_index;
574 if( i_meanwhile_released )
576 /* That's where it becomes funny :-). Since we didn't take locks for
577 efficiency reasons, other threads (including ourselves, with
578 input_DemuxPacket) might have released packets to the netlist.
579 So we have to copy these iovec where they should go.
581 BTW, that explains why the TS netlist is
582 (INPUT_MAX_TS +1) + (TS_READ_ONCE -1) large. */
584 i_currently_removed = i_current_index - i_base_index;
585 if( i_meanwhile_released < i_currently_removed )
587 /* Copy all iovecs in that case */
588 memcpy( &p_input->netlist.p_ts_free[p_input->netlist.i_ts_index]
589 + i_currently_removed,
590 &p_input->netlist.p_ts_free[p_input->netlist.i_ts_index],
591 i_meanwhile_released * sizeof(struct iovec) );
595 /* We have fewer places than items, so we only move
596 i_currently_removed of them. */
597 memcpy( &p_input->netlist.p_ts_free[i_base_index],
598 &p_input->netlist.p_ts_free[p_input->netlist.i_ts_index],
599 i_currently_removed * sizeof(struct iovec) );
602 /* Update i_netlist_index with the information gathered above. */
603 p_input->netlist.i_ts_index += i_currently_removed;
607 /* Nothing happened. */
608 p_input->netlist.i_ts_index = i_current_index;
611 vlc_mutex_unlock( &p_input->netlist.lock );
613 #else /* FIFO netlist */
614 /* & is modulo ; that's where we make the loop. */
615 p_input->netlist.i_ts_start = i_current_index & INPUT_MAX_TS;
619 p_input->c_packets_read += i_current_index - i_base_index;
620 p_input->c_bytes += (i_current_index - i_base_index) * TS_PACKET_SIZE;
625 /*****************************************************************************
626 * input_SortPacket: find out whether we need that packet
627 *****************************************************************************/
628 static __inline__ void input_SortPacket( input_thread_t *p_input,
629 ts_packet_t *p_ts_packet )
634 /* Verify that sync_byte, error_indicator and scrambling_control are
636 if( !(p_ts_packet->buffer[0] == 0x47) || (p_ts_packet->buffer[1] & 0x80) ||
637 (p_ts_packet->buffer[3] & 0xc0) )
639 intf_DbgMsg("input debug: invalid TS header (%p)\n", p_ts_packet);
643 /* Get the PID of the packet. Note that ntohs is needed, for endianness
644 purposes (see man page). */
645 i_current_pid = U16_AT(&p_ts_packet->buffer[1]) & 0x1fff;
647 //intf_DbgMsg("input debug: pid %d received (%p)\n",
648 // i_current_pid, p_ts_packet);
650 /* Lock current ES state. */
651 vlc_mutex_lock( &p_input->es_lock );
653 /* Verify that we actually want this PID. */
654 for( i_es_loop = 0; i_es_loop < INPUT_MAX_SELECTED_ES; i_es_loop++ )
656 if( p_input->pp_selected_es[i_es_loop] != NULL)
658 if( (*p_input->pp_selected_es[i_es_loop]).i_id
661 /* Don't need the lock anymore, since the value pointed
662 out by p_input->pp_selected_es[i_es_loop] can only be
663 modified from inside the input_thread (by the PSI
664 decoder): interface thread is only allowed to modify
665 the pp_selected_es table */
666 vlc_mutex_unlock( &p_input->es_lock );
668 /* We're interested. Pass it to the demultiplexer. */
669 input_DemuxTS( p_input, p_ts_packet,
670 p_input->pp_selected_es[i_es_loop] );
676 /* pp_selected_es should not contain any hole. */
680 vlc_mutex_unlock( &p_input->es_lock );
683 /* We weren't interested in receiving this packet. Give it back to the
685 //intf_DbgMsg("SortPacket: freeing unwanted TS %p (pid %d)\n", p_ts_packet,
686 // U16_AT(&p_ts_packet->buffer[1]) & 0x1fff);
687 input_NetlistFreeTS( p_input, p_ts_packet );
689 p_input->c_packets_trashed++;
693 /*****************************************************************************
694 * input_DemuxTS: first step of demultiplexing: the TS header
695 *****************************************************************************
696 * Stream must also only contain PES and PSI, so PID must have been filtered
697 *****************************************************************************/
698 static __inline__ void input_DemuxTS( input_thread_t *p_input,
699 ts_packet_t *p_ts_packet,
700 es_descriptor_t *p_es_descriptor )
703 boolean_t b_adaption; /* Adaption field is present */
704 boolean_t b_payload; /* Packet carries payload */
705 boolean_t b_unit_start; /* A PSI or a PES start in the packet */
706 boolean_t b_trash = 0; /* Must the packet be trashed ? */
707 boolean_t b_lost = 0; /* Was there a packet lost ? */
711 ASSERT(p_es_descriptor);
713 #define p (p_ts_packet->buffer)
715 //intf_DbgMsg("input debug: TS-demultiplexing packet %p, pid %d, number %d\n",
716 // p_ts_packet, U16_AT(&p[1]) & 0x1fff, p[3] & 0x0f);
719 p_es_descriptor->c_packets++;
720 p_es_descriptor->c_bytes += TS_PACKET_SIZE;
723 /* Extract flags values from TS common header. */
724 b_unit_start = (p[1] & 0x40);
725 b_adaption = (p[3] & 0x20);
726 b_payload = (p[3] & 0x10);
728 /* Extract adaption field informations if any */
731 /* We don't have any adaptation_field, so payload start immediately
732 after the 4 byte TS header */
733 p_ts_packet->i_payload_start = 4;
737 /* p[4] is adaptation_field_length minus one */
738 p_ts_packet->i_payload_start = 5 + p[4];
740 /* The adaption field can be limited to the adaptation_field_length byte,
741 so that there is nothing to do: skip this possibility */
744 /* If the packet has both adaptation_field and payload, adaptation_field
745 cannot be more than 182 bytes long; if there is only an
746 adaptation_field, it must fill the next 183 bytes. */
747 if( b_payload ? (p[4] > 182) : (p[4] != 183) )
749 intf_DbgMsg("input debug: invalid TS adaptation field (%p)\n",
752 p_es_descriptor->c_invalid_packets++;
757 /* No we are sure that the byte containing flags is present: read it */
760 /* discontinuity_indicator */
763 intf_DbgMsg("discontinuity_indicator encountered by TS demux " \
764 "(position read: %d, saved: %d)\n", p[5] & 0x80,
765 p_es_descriptor->i_continuity_counter);
767 /* If the PID carries the PCR, there will be a system time-base
768 discontinuity. We let the PCR decoder handle that. */
769 p_es_descriptor->b_discontinuity = 1;
771 /* There also may be a continuity_counter discontinuity:
772 resynchronise our counter with the one of the stream */
773 p_es_descriptor->i_continuity_counter = (p[3] & 0x0f) - 1;
776 /* random_access_indicator */
777 p_es_descriptor->b_random |= p[5] & 0x40;
779 /* If this is a PCR_PID, and this TS packet contains a PCR,
780 we pass it along to the PCR decoder. */
781 if( (p_es_descriptor->b_pcr) && (p[5] & 0x10) )
783 /* There should be a PCR field in the packet, check if the
784 adaption field is long enough to carry it */
787 /* Call the PCR decoder */
788 input_PcrDecode( p_input, p_es_descriptor, &p[6] );
795 /* Check the continuity of the stream. */
796 i_dummy = ((p[3] & 0x0f) - p_es_descriptor->i_continuity_counter) & 0x0f;
799 /* Everything is ok, just increase our counter */
800 p_es_descriptor->i_continuity_counter++;
804 if( !b_payload && i_dummy == 0 )
806 /* This is a packet without payload, this is allowed by the draft
807 As there is nothing interesting in this packet (except PCR that
808 have already been handled), we can trash the packet. */
809 intf_DbgMsg("Packet without payload received by TS demux\n");
812 else if( i_dummy <= 0 )
814 /* Duplicate packet: mark it as being to be trashed. */
815 intf_DbgMsg("Duplicate packet received by TS demux\n");
818 else if( p_es_descriptor->i_continuity_counter == 0xFF )
820 /* This means that the packet is the first one we receive for this
821 ES since the continuity counter ranges between 0 and 0x0F
822 excepts when it has been initialized by the input: Init the
823 counter to the correct value. */
824 intf_DbgMsg("First packet for PID %d received by TS demux\n",
825 p_es_descriptor->i_id);
826 p_es_descriptor->i_continuity_counter = (p[3] & 0x0f);
830 /* This can indicate that we missed a packet or that the
831 continuity_counter wrapped and we received a dup packet: as we
832 don't know, do as if we missed a packet to be sure to recover
833 from this situation */
834 intf_DbgMsg("Packet lost by TS demux: current %d, packet %d\n",
835 p_es_descriptor->i_continuity_counter & 0x0f,
838 p_es_descriptor->i_continuity_counter = p[3] & 0x0f;
842 /* Trash the packet if it has no payload or if it is bad */
845 input_NetlistFreeTS( p_input, p_ts_packet );
847 p_input->c_packets_trashed++;
852 if( p_es_descriptor->b_psi )
854 /* The payload contains PSI tables */
855 input_DemuxPSI( p_input, p_ts_packet, p_es_descriptor,
856 b_unit_start, b_lost );
860 /* The payload carries a PES stream */
861 input_DemuxPES( p_input, p_ts_packet, p_es_descriptor,
862 b_unit_start, b_lost );
872 /*****************************************************************************
874 *****************************************************************************
875 * Gather a PES packet.
876 *****************************************************************************/
877 static __inline__ void input_DemuxPES( input_thread_t *p_input,
878 ts_packet_t *p_ts_packet,
879 es_descriptor_t *p_es_descriptor,
880 boolean_t b_unit_start,
881 boolean_t b_packet_lost )
884 pes_packet_t* p_last_pes;
886 int i_ts_payload_size;
889 #define p_pes (p_es_descriptor->p_pes_packet)
893 ASSERT(p_es_descriptor);
895 //intf_DbgMsg("PES-demultiplexing %p (%p)\n", p_ts_packet, p_pes);
897 /* If we lost data, discard the PES packet we are trying to reassemble
898 if any and wait for the beginning of a new one in order to synchronise
900 if( b_packet_lost && p_pes != NULL )
902 intf_DbgMsg("PES %p trashed because of packet lost\n", p_pes);
903 input_NetlistFreePES( p_input, p_pes );
907 /* If the TS packet contains the begining of a new PES packet, and if we
908 were reassembling a PES packet, then the PES should be complete now,
909 so parse its header and give it to the decoders */
910 if( b_unit_start && p_pes != NULL )
912 /* Parse the header. The header has a variable length, but in order
913 to improve the algorithm, we will read the 14 bytes we may be
916 /* If this part of the header did not fit in the current TS packet,
917 copy the part of the header we are interested in to the
918 p_pes_header_save buffer. The buffer is dynamicly allocated if
919 needed so it's time expensive but this situation almost never
921 p_ts = p_pes->p_first_ts;
922 i_ts_payload_size = p_ts->i_payload_end - p_ts->i_payload_start;
924 if(i_ts_payload_size < PES_HEADER_SIZE)
926 intf_DbgMsg("Code never tested encountered, WARNING ! (benny)\n");
927 if( !p_pes->p_pes_header_save )
929 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 useful 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;
967 /* Get the PES size if defined */
968 if( (i_dummy = U16_AT(p_pes->p_pes_header + 4)) )
970 p_pes->i_pes_real_size = i_dummy + 6;
974 /* Now we have the part of the PES header we were interested in:
975 p_pes_header and i_pes_real_size ; we can parse it */
976 input_ParsePES( p_input, p_es_descriptor );
979 /* If we are at the beginning of a new PES packet, we must fetch a new
980 PES buffer to begin with the reassembly of this PES packet. This is
981 also here that we can synchronise with the stream if we we lost
982 packets or if the decoder has just started */
987 /* Get a new one PES from the PES netlist. */
988 if( (p_pes = input_NetlistGetPES( p_input )) == (NULL) )
990 /* PES netlist is empty ! */
991 p_input->b_error = 1;
995 //intf_DbgMsg("New PES packet %p (first TS: %p)\n", p_pes, p_ts_packet);
997 /* Init the PES fields so that the first TS packet could be
998 * correctly added to the PES packet (see below) */
999 p_pes->p_first_ts = p_ts_packet;
1000 p_pes->p_last_ts = NULL;
1002 /* If the last pes packet was null, this means that the
1003 * synchronization was lost and so warn the decoder that he
1004 * will have to find a way to recover */
1006 p_pes->b_data_loss = 1;
1008 /* Read the b_random_access flag status and then reinit it */
1009 p_pes->b_random_access = p_es_descriptor->b_random;
1010 p_es_descriptor->b_random = 0;
1013 /* If the PES header fits in the first TS packet, we can
1014 * already set p_pes->p_pes_header, and in all cases we
1015 * set p_pes->i_pes_real_size */
1016 if( p_ts_packet->i_payload_end - p_ts_packet->i_payload_start
1017 >= PES_HEADER_SIZE )
1019 p_pes->p_pes_header = &(p_ts_packet->buffer[p_ts_packet->i_payload_start]);
1020 if( (i_dummy = U16_AT(p_pes->p_pes_header + 4)) )
1022 p_pes->i_pes_real_size = i_dummy + 6;
1028 /* If we are synchronized with the stream, and so if we are ready to
1029 receive correctly the data, add the TS packet to the current PES
1033 //intf_DbgMsg("Adding TS %p to PES %p\n", p_ts_packet, p_pes);
1035 /* Size of the payload carried in the TS packet */
1036 i_ts_payload_size = p_ts_packet->i_payload_end -
1037 p_ts_packet->i_payload_start;
1039 /* Update the relations between the TS packets */
1040 p_ts_packet->p_prev_ts = p_pes->p_last_ts;
1041 p_ts_packet->p_next_ts = NULL;
1042 if( p_pes->i_ts_packets != 0 )
1044 /* Regarder si il serait pas plus efficace de ne creer que
1045 * les liens precedent->suivant pour le moment, et les
1046 * liens suivant->precedent quand le paquet est termine */
1047 /* Otherwise it is the first TS packet. */
1048 p_pes->p_last_ts->p_next_ts = p_ts_packet;
1050 /* Now add the TS to the PES packet */
1051 p_pes->p_last_ts = p_ts_packet;
1052 p_pes->i_ts_packets++;
1053 p_pes->i_pes_size += i_ts_payload_size;
1057 i_dummy = p_ts_packet->i_payload_end - p_ts_packet->i_payload_start;
1058 p_es_descriptor->c_payload_bytes += i_dummy;
1061 /* We can check if the packet is finished */
1062 if( p_pes->i_pes_size == p_pes->i_pes_real_size )
1064 /* The packet is finished, parse it */
1065 input_ParsePES( p_input, p_es_descriptor );
1067 /* Tell the Demux we have parsed this PES, no need to redo it */
1073 /* Since we don't use the TS packet to build a PES packet, we don't
1074 need it anymore, so give it back to the netlist */
1075 //intf_DbgMsg("Trashing TS %p: no PES being build\n", p_ts_packet);
1076 input_NetlistFreeTS( p_input, p_ts_packet );
1084 /*****************************************************************************
1086 *****************************************************************************
1087 * Parse a finished PES packet and analyze its header.
1088 *****************************************************************************/
1089 static __inline__ void input_ParsePES( input_thread_t *p_input,
1090 es_descriptor_t *p_es_descriptor )
1092 decoder_fifo_t * p_fifo;
1093 u8 i_pes_header_size;
1095 int i_ts_payload_size;
1098 #define p_pes (p_es_descriptor->p_pes_packet)
1100 //intf_DbgMsg("End of PES packet %p\n", p_pes);
1102 /* First read the 6 header bytes common to all PES packets:
1103 use them to test the PES validity */
1104 if( (p_pes->p_pes_header[0] || p_pes->p_pes_header[1] ||
1105 (p_pes->p_pes_header[2] != 1)) ||
1106 /* packet_start_code_prefix != 0x000001 */
1107 ((p_pes->i_pes_real_size) &&
1108 (p_pes->i_pes_real_size != p_pes->i_pes_size)) )
1109 /* PES_packet_length is set and != total received payload */
1111 /* Trash the packet and set p_pes to NULL to be sure the next PES
1112 packet will have its b_data_lost flag set */
1113 intf_DbgMsg("Corrupted PES packet received: trashed\n");
1114 input_NetlistFreePES( p_input, p_pes );
1120 /* The PES packet is valid. Check its type to test if it may
1121 carry additional informations in a header extension */
1122 p_pes->i_stream_id = p_pes->p_pes_header[3];
1124 switch( p_pes->i_stream_id )
1126 case 0xBE: /* Padding */
1127 case 0xBC: /* Program stream map */
1128 case 0xBF: /* Private stream 2 */
1129 case 0xB0: /* ECM */
1130 case 0xB1: /* EMM */
1131 case 0xFF: /* Program stream directory */
1132 case 0xF2: /* DSMCC stream */
1133 case 0xF8: /* ITU-T H.222.1 type E stream */
1134 /* The payload begins immediatly after the 6 bytes header, so
1135 we have finished with the parsing */
1136 i_pes_header_size = 6;
1140 /* The PES header contains at least 3 more bytes: parse them */
1141 p_pes->b_data_alignment = p_pes->p_pes_header[6] & 0x04;
1142 p_pes->b_has_pts = p_pes->p_pes_header[7] & 0x80;
1143 i_pes_header_size = p_pes->p_pes_header[8] + 9;
1145 /* Now parse the optional header extensions (in the limit of
1147 if( p_pes->b_has_pts )
1149 pcr_descriptor_t * p_pcr;
1151 p_pcr = p_input->p_pcr;
1154 ( ((mtime_t)(p_pes->p_pes_header[9] & 0x0E) << 29) |
1155 (((mtime_t)U16_AT(p_pes->p_pes_header + 10) << 14) - (1 << 14)) |
1156 ((mtime_t)U16_AT(p_pes->p_pes_header + 12) >> 1) ) * 300;
1159 if( p_pcr->i_synchro_state )
1161 switch( p_pcr->i_synchro_state )
1163 case SYNCHRO_NOT_STARTED:
1164 p_pes->b_has_pts = 0;
1168 p_pes->i_pts += p_pcr->delta_pcr;
1169 p_pcr->delta_absolute = mdate() - p_pes->i_pts + INPUT_PTS_DELAY;
1170 p_pes->i_pts += p_pcr->delta_absolute;
1171 p_pcr->i_synchro_state = 0;
1174 case SYNCHRO_REINIT: /* We skip a PES */
1175 p_pes->b_has_pts = 0;
1176 p_pcr->i_synchro_state = SYNCHRO_START;
1182 p_pes->i_pts += p_pcr->delta_pcr + p_pcr->delta_absolute;
1188 /* Now we've parsed the header, we just have to indicate in some
1189 specific TS packets where the PES payload begins (renumber
1190 i_payload_start), so that the decoders can find the beginning
1191 of their data right out of the box. */
1192 p_ts = p_pes->p_first_ts;
1193 i_ts_payload_size = p_ts->i_payload_end - p_ts->i_payload_start;
1194 while( i_pes_header_size > i_ts_payload_size )
1196 /* These packets are entirely filled by the PES header. */
1197 i_pes_header_size -= i_ts_payload_size;
1198 p_ts->i_payload_start = p_ts->i_payload_end;
1199 /* Go to the next TS packet: here we won't have to test it is
1200 not NULL because we trash the PES packets when packet lost
1202 p_ts = p_ts->p_next_ts;
1203 i_ts_payload_size = p_ts->i_payload_end - p_ts->i_payload_start;
1205 /* This last packet is partly header, partly payload. */
1206 p_ts->i_payload_start += i_pes_header_size;
1209 /* Now we can eventually put the PES packet in the decoder's
1211 switch( p_es_descriptor->i_type )
1213 case MPEG1_VIDEO_ES:
1214 case MPEG2_VIDEO_ES:
1216 p_fifo = &(((vdec_thread_t*)(p_es_descriptor->p_dec))->fifo);
1218 p_fifo = &(((vpar_thread_t*)(p_es_descriptor->p_dec))->fifo);
1222 case MPEG1_AUDIO_ES:
1223 case MPEG2_AUDIO_ES:
1224 p_fifo = &(((adec_thread_t*)(p_es_descriptor->p_dec))->fifo);
1228 /* we skip 4 bytes at the beginning of the AC3 payload */
1229 //p_ts->i_payload_start += 4;
1230 p_fifo = &(((ac3dec_thread_t *)(p_es_descriptor->p_dec))->fifo);
1234 p_fifo = &(((lpcmdec_thread_t *)(p_es_descriptor->p_dec))->fifo);
1238 /* we skip the first byte at the beginning of the
1239 * subpicture payload, it only contains the SPU ID. */
1240 p_ts->i_payload_start++;
1241 p_fifo = &(((spudec_thread_t *)(p_es_descriptor->p_dec))->fifo);
1245 /* This should never happen */
1246 intf_DbgMsg("Unknown stream type (%d, %d): PES trashed\n",
1247 p_es_descriptor->i_id, p_es_descriptor->i_type);
1252 if( p_fifo != NULL )
1254 vlc_mutex_lock( &p_fifo->data_lock );
1255 if( DECODER_FIFO_ISFULL( *p_fifo ) )
1257 /* The FIFO is full !!! This should not happen. */
1259 p_input->c_packets_trashed += p_pes->i_ts_packets;
1260 p_es_descriptor->c_invalid_packets += p_pes->i_ts_packets;
1262 input_NetlistFreePES( p_input, p_pes );
1263 intf_DbgMsg("PES trashed - fifo full ! (%d, %d)\n",
1264 p_es_descriptor->i_id, p_es_descriptor->i_type);
1268 //intf_DbgMsg("Putting %p into fifo %p/%d\n",
1269 // p_pes, p_fifo, p_fifo->i_end);
1270 p_fifo->buffer[p_fifo->i_end] = p_pes;
1271 DECODER_FIFO_INCEND( *p_fifo );
1273 /* Warn the decoder that it's got work to do. */
1274 vlc_cond_signal( &p_fifo->data_wait );
1276 vlc_mutex_unlock( &p_fifo->data_lock );
1280 intf_DbgMsg("No fifo to receive PES %p: trash\n", p_pes);
1282 p_input->c_packets_trashed += p_pes->i_ts_packets;
1283 p_es_descriptor->c_invalid_packets += p_pes->i_ts_packets;
1285 input_NetlistFreePES( p_input, p_pes );
1293 /*****************************************************************************
1295 *****************************************************************************
1296 * Notice that current ES state has been locked by input_SortPacket. (No more true,
1297 * changed by benny - FIXME: See if it's ok, and definitely change the code ?? )
1298 *****************************************************************************/
1299 static __inline__ void input_DemuxPSI( input_thread_t *p_input,
1300 ts_packet_t *p_ts_packet,
1301 es_descriptor_t *p_es_descriptor,
1302 boolean_t b_unit_start, boolean_t b_packet_lost )
1304 int i_data_offset; /* Offset of the interesting data in the TS packet */
1305 u16 i_data_length; /* Length of those data */
1306 //boolean_t b_first_section; /* Was there another section in the TS packet ? */
1309 ASSERT(p_ts_packet);
1310 ASSERT(p_es_descriptor);
1312 #define p_psi (p_es_descriptor->p_psi_section)
1314 //intf_DbgMsg( "input debug: PSI demultiplexing %p (%p)\n", p_ts_packet, p_input);
1316 //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);
1319 /* Try to find the beginning of the payload in the packet to initialise
1320 the do-while loop that follows -> Compute the i_data_offset variable:
1321 by default, the value is set so that we won't enter in the while loop.
1322 It will be set to a correct value if the data are not corrupted */
1323 i_data_offset = TS_PACKET_SIZE;
1325 /* Has the reassembly of a section already began in a previous packet ? */
1326 if( p_psi->b_running_section )
1328 /* Was data lost since the last TS packet ? */
1331 /* Discard the packet and wait for the begining of a new one to resynch */
1332 p_psi->b_running_section = 0;
1333 p_psi->i_current_position = 0;
1334 intf_DbgMsg( "PSI section(s) discarded due to packet loss\n" );
1338 /* The data that complete a previously began section are always at
1339 the beginning of the TS payload... */
1340 i_data_offset = p_ts_packet->i_payload_start;
1341 /* ...Unless there is a pointer field, that we have to bypass */
1344 //intf_DbgMsg( "New part of the section received at offset %d\n", i_data_offset );
1347 /* We are looking for the beginning of a new section */
1352 /* Get the offset at which the data for that section can be found
1353 The offset is stored in the pointer_field since we are interested in
1354 the first section of the TS packet. Note that the +1 is to bypass
1355 the pointer field */
1356 i_data_offset = p_ts_packet->i_payload_start +
1357 p_ts_packet->buffer[p_ts_packet->i_payload_start] + 1;
1358 //intf_DbgMsg( "New section beginning at offset %d in TS packet\n", i_data_offset );
1362 /* This may either mean that the TS is bad or that the packet contains
1363 the end of a section that had been discarded in a previous loop:
1364 trash the TS packet since we cannot do anything with those data: */
1365 p_psi->b_running_section = 0;
1366 p_psi->i_current_position = 0;
1367 intf_DbgMsg( "PSI packet discarded due to lack of synchronisation\n" );
1371 /* The section we will deal with during the first iteration of the following
1372 loop is the first one contained in the TS packet */
1373 // b_first_section = 1;
1375 /* Reassemble the pieces of sections contained in the TS packet and decode
1376 the sections that could have been completed.
1377 Stop when we reach the end of the packet or stuffing bytes */
1378 while( i_data_offset < TS_PACKET_SIZE && p_ts_packet->buffer[i_data_offset] != 0xFF )
1380 /* If the current section is a new one, reinit the data fields of the p_psi
1381 struct to start its decoding */
1382 if( !p_psi->b_running_section )
1384 /* Read the length of the new section */
1385 p_psi->i_length = (U16_AT(&p_ts_packet->buffer[i_data_offset+1]) & 0xFFF) + 3;
1386 //intf_DbgMsg( "Section length %d\n", p_psi->i_length );
1387 if( p_psi->i_length > PSI_SECTION_SIZE )
1389 /* The TS packet is corrupted, stop here to avoid possible a seg fault */
1390 intf_DbgMsg( "PSI Section size is too big, aborting its reception\n" );
1394 /* Init the reassembly of that section */
1395 p_psi->b_running_section = 1;
1396 p_psi->i_current_position = 0;
1399 /* Compute the length of data related to the section in this TS packet */
1400 if( p_psi->i_length - p_psi->i_current_position > TS_PACKET_SIZE - i_data_offset)
1401 i_data_length = TS_PACKET_SIZE - i_data_offset;
1403 i_data_length = p_psi->i_length - p_psi->i_current_position;
1405 /* Copy those data in the section buffer */
1406 memcpy( &p_psi->buffer[p_psi->i_current_position], &p_ts_packet->buffer[i_data_offset],
1409 /* Interesting data are now after the ones we copied, since no gap is
1410 allowed between 2 sections in a TS packets */
1411 i_data_offset += i_data_length;
1413 /* Decode the packet if it is now complete */
1414 if (p_psi->i_length == p_psi->i_current_position + i_data_length)
1416 /* Packet is complete, decode it */
1417 //intf_DbgMsg( "SECTION COMPLETE: starting decoding of its data\n" );
1418 input_PsiDecode( p_input, p_psi );
1420 /* Prepare the buffer to receive a new section */
1421 p_psi->i_current_position = 0;
1422 p_psi->b_running_section = 0;
1424 /* The new section won't be the first anymore */
1425 //b_first_section = 0;
1429 /* Prepare the buffer to receive the next part of the section */
1430 p_psi->i_current_position += i_data_length;
1431 //intf_DbgMsg( "Section not complete, waiting for the end\n" );
1434 //intf_DbgMsg( "Must loop ? Next data offset: %d, stuffing: %d\n",
1435 // i_data_offset, p_ts_packet->buffer[i_data_offset] );
1438 /* Relase the TS packet, we don't need it anymore */
1439 input_NetlistFreeTS( p_input, p_ts_packet );