1 /*******************************************************************************
2 * input.c: input thread
4 *******************************************************************************
5 * Read an MPEG2 stream, demultiplex and parse it before sending it to
7 ******************************************************************************/
9 /*******************************************************************************
11 *******************************************************************************/
20 #include <X11/extensions/XShm.h>
21 #include <sys/soundcard.h>
25 #include <sys/ioctl.h>
27 #include <netinet/in.h>
32 #include "vlc_thread.h"
37 #include "input_psi.h"
38 #include "input_pcr.h"
39 #include "input_netlist.h"
40 #include "decoder_fifo.h"
41 #include "input_file.h"
42 #include "input_network.h"
44 #include "audio_output.h"
45 #include "audio_decoder.h"
48 #include "video_output.h"
49 #include "video_decoder.h"
52 /******************************************************************************
54 ******************************************************************************/
55 static void input_Thread( input_thread_t *p_input );
56 static void ErrorThread( input_thread_t *p_input );
57 static void EndThread( input_thread_t *p_input );
58 static __inline__ int input_ReadPacket( input_thread_t *p_input );
59 static __inline__ void input_SortPacket( input_thread_t *p_input,
60 ts_packet_t *ts_packet );
61 static __inline__ void input_DemuxTS( input_thread_t *p_input,
62 ts_packet_t *ts_packet,
63 es_descriptor_t *es_descriptor );
64 static __inline__ void input_DemuxPES( 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 );
68 static __inline__ void input_DemuxPSI( input_thread_t *p_input,
69 ts_packet_t *ts_packet,
70 es_descriptor_t *p_es_descriptor,
71 boolean_t b_unit_start, boolean_t b_packet_lost );
73 /*******************************************************************************
74 * input_CreateThread: initialize and spawn an input thread
75 *******************************************************************************
76 * This function initializes and spawns an input thread. It returns NULL on
77 * failure. If you want a better understanding of the input thread, don't start
78 * by reading this function :-).
79 *******************************************************************************/
80 input_thread_t *input_CreateThread( input_cfg_t *p_cfg )
82 input_thread_t * p_input;
85 intf_DbgMsg("input debug 1-1: creating thread (cfg : %p)\n", p_cfg );
87 /* Allocate input_thread_t structure. */
88 if( !( p_input = (input_thread_t *)malloc(sizeof(input_thread_t)) ) )
90 intf_ErrMsg("input error: can't allocate input thread structure (%s)\n",
95 bzero( p_input, sizeof(input_thread_t));
96 for( i_index = 0; i_index < INPUT_MAX_ES; i_index++ )
98 p_input->p_es[i_index].i_id = EMPTY_PID;
101 /* Find out which method we are gonna use and retrieve pointers. */
102 if( !((p_cfg->i_properties) & INPUT_CFG_METHOD) )
104 /* i_method is not set. */
105 intf_DbgMsg("input debug: using default method (%d)\n",
106 INPUT_DEFAULT_METHOD);
107 p_cfg->i_method = INPUT_DEFAULT_METHOD;
108 p_cfg->i_properties |= INPUT_CFG_METHOD;
110 p_input->i_method = p_cfg->i_method;
111 switch( p_cfg->i_method )
114 case INPUT_METHOD_TS_FILE:
115 p_input->p_open = &input_FileCreateMethod;
116 p_input->p_read = &input_FileRead;
117 p_input->p_clean = &input_FileDestroyMethod;
120 /* Network methods */
121 case INPUT_METHOD_TS_UCAST:
122 case INPUT_METHOD_TS_MCAST:
123 case INPUT_METHOD_TS_BCAST:
124 case INPUT_METHOD_TS_VLAN_BCAST:
125 p_input->p_open = &input_NetworkCreateMethod;
126 p_input->p_read = &input_NetworkRead;
127 p_input->p_clean = &input_NetworkDestroyMethod;
130 case INPUT_METHOD_NONE:
133 /* Internal error, which should never happen */
134 intf_DbgMsg("input debug: unknow method type %d\n",
141 /* Initialize PSI decoder. */
142 intf_DbgMsg("Initializing PSI decoder\n");
143 if( input_PsiInit( p_input ) == -1 )
149 /* Initialize PCR decoder. */
150 intf_DbgMsg("Initializing PCR decoder\n");
151 if( input_PcrInit( p_input ) == -1 )
153 input_PsiClean( p_input );
158 /* Initialize netlists. */
159 if( input_NetlistOpen( p_input ) )
161 input_PsiClean( p_input );
162 input_PcrClean( p_input );
168 /* Initialize counters. */
169 p_input->c_bytes = 0;
170 p_input->c_payload_bytes = 0;
171 p_input->c_ts_packets_read = 0;
172 p_input->c_ts_packets_trashed = 0;
174 p_input->c_loops = 0;
178 /* Let the appropriate method open the socket. */
179 if( (*(p_input->p_open))( p_input, p_cfg ) == -1 )
181 input_NetlistClean( p_input );
182 input_PsiClean( p_input );
183 input_PcrClean( p_input );
188 intf_DbgMsg("input debug: method %d properly initialized the socket\n",
191 /* Create thread and set locks. */
193 vlc_mutex_init( &p_input->netlist.lock );
194 vlc_mutex_init( &p_input->programs_lock );
195 vlc_mutex_init( &p_input->es_lock );
197 input_Thread( p_input );
199 if( vlc_thread_create(&p_input->thread_id, "input", (vlc_thread_func_t)input_Thread,
202 intf_ErrMsg("input error: can't spawn input thread (%s)\n",
204 (*p_input->p_clean)( p_input );
205 input_NetlistClean( p_input );;
206 input_PsiClean( p_input );
207 input_PcrClean( p_input );
213 /* Default setting for new decoders */
214 p_input->p_aout = p_cfg->p_aout;
219 /******************************************************************************
220 * input_DestroyThread: mark an input thread as zombie
221 ******************************************************************************
222 * This function should not return until the thread is effectively cancelled.
223 ******************************************************************************/
224 void input_DestroyThread( input_thread_t *p_input )
226 intf_DbgMsg("input debug: requesting termination of input thread\n");
227 p_input->b_die = 1; /* ask thread to kill itself */
229 /* Remove this as soon as the "status" flag is implemented */
230 vlc_thread_join( p_input->thread_id ); /* wait until it's done */
234 /*******************************************************************************
235 * input_OpenAudioStream: open an audio stream
236 *******************************************************************************
237 * This function spawns an audio decoder and plugs it on the audio output
239 *******************************************************************************/
240 int input_OpenAudioStream( input_thread_t *p_input, int i_id )
245 /*******************************************************************************
246 * input_CloseAudioStream: close an audio stream
247 *******************************************************************************
248 * This function destroys an audio decoder.
249 *******************************************************************************/
250 void input_CloseAudioStream( input_thread_t *p_input, int i_id )
255 /*******************************************************************************
256 * input_OpenVideoStream: open a video stream
257 *******************************************************************************
258 * This function spawns a video decoder and plugs it on a video output thread.
259 *******************************************************************************/
260 int input_OpenVideoStream( input_thread_t *p_input,
261 struct vout_thread_s *p_vout, struct video_cfg_s * p_cfg )
266 /*******************************************************************************
267 * input_CloseVideoStream: close a video stream
268 *******************************************************************************
269 * This function destroys an video decoder.
270 *******************************************************************************/
271 void input_CloseVideoStream( input_thread_t *p_input, int i_id )
277 /* following functions are local */
279 /*******************************************************************************
280 * input_Thread: input thread
281 *******************************************************************************
282 * Thread in charge of processing the network packets and demultiplexing.
283 *******************************************************************************/
284 static void input_Thread( input_thread_t *p_input )
286 intf_DbgMsg("input debug 11-1: thread %p is active\n", p_input);
287 while( !p_input->b_die && !p_input->b_error )
289 /* Scatter read the UDP packet from the network or the file. */
290 if( (input_ReadPacket( p_input )) == (-1) )
292 /* ??? Normally, a thread can't kill itself, but we don't have
293 * any method in case of an error condition ... */
294 p_input->b_error = 1;
302 if( p_input->b_error )
304 ErrorThread( p_input );
307 /* Ohoh, we have to die as soon as possible. */
308 EndThread( p_input );
310 intf_DbgMsg("input debug: thread %p destroyed\n", p_input);
315 /******************************************************************************
316 * ErrorThread: RunThread() error loop
317 ******************************************************************************/
318 static void ErrorThread( input_thread_t *p_input )
320 while( !p_input->b_die )
322 msleep( INPUT_IDLE_SLEEP );
326 /*******************************************************************************
327 * EndThread: end the input thread
328 *******************************************************************************/
329 static void EndThread( input_thread_t * p_input )
333 (*p_input->p_clean)( p_input ); /* close input method */
335 /* Destroy all decoder threads. */
336 for( i_es_loop = 0; i_es_loop < INPUT_MAX_ES; i_es_loop++ )
338 if( p_input->pp_selected_es[i_es_loop] )
340 switch( p_input->pp_selected_es[i_es_loop]->i_type )
344 vdec_DestroyThread( (vdec_thread_t*)(p_input->pp_selected_es[i_es_loop]->p_dec) /*, NULL */ );
349 adec_DestroyThread( (adec_thread_t*)(p_input->pp_selected_es[i_es_loop]->p_dec) );
358 /* pp_selected_es should not contain any hole. */
363 input_NetlistClean( p_input ); /* clean netlist */
364 input_PsiClean( p_input ); /* clean PSI information */
365 input_PcrClean( p_input ); /* clean PCR information */
366 free( p_input ); /* free input_thread structure */
368 intf_DbgMsg("input debug: EndThread(%p)\n", p_input);
371 /*******************************************************************************
372 * input_ReadPacket: reads a packet from the network or the file
373 *******************************************************************************/
374 static __inline__ int input_ReadPacket( input_thread_t *p_input )
376 int i_base_index; /* index of the first free iovec */
379 #ifdef INPUT_LIFO_TS_NETLIST
380 int i_meanwhile_released;
381 int i_currently_removed;
383 ts_packet_t * p_ts_packet;
385 /* In this function, we only care about the TS netlist. PES netlist
386 * is for the demultiplexer. */
387 #ifdef INPUT_LIFO_TS_NETLIST
388 i_base_index = p_input->netlist.i_ts_index;
390 /* Verify that we still have packets in the TS netlist */
391 if( (INPUT_MAX_TS + INPUT_TS_READ_ONCE - 1 - p_input->netlist.i_ts_index) <= INPUT_TS_READ_ONCE )
393 intf_ErrMsg("input error: TS netlist is empty !\n");
397 #else /* FIFO netlist */
398 i_base_index = p_input->netlist.i_ts_start;
399 if( p_input->netlist.i_ts_start + INPUT_TS_READ_ONCE -1 > INPUT_MAX_TS )
401 /* The netlist is splitted in 2 parts. We must gather them to consolidate
402 the FIFO (we make the loop easily in having the same iovec at the far
403 end and in the beginning of netlist_free).
404 That's why the netlist is (INPUT_MAX_TS +1) + (INPUT_TS_READ_ONCE -1)
406 memcpy( p_input->netlist.p_ts_free + INPUT_MAX_TS + 1,
407 p_input->netlist.p_ts_free,
408 (p_input->netlist.i_ts_start + INPUT_TS_READ_ONCE - 1 - INPUT_MAX_TS)
409 * sizeof(struct iovec) );
412 /* Verify that we still have packets in the TS netlist */
413 if( ((p_input->netlist.i_ts_end -1 - p_input->netlist.i_ts_start) & INPUT_MAX_TS) <= INPUT_TS_READ_ONCE )
415 intf_ErrMsg("input error: TS netlist is empty !\n");
418 #endif /* FIFO netlist */
420 /* Scatter read the buffer. */
421 i_packet_size = (*p_input->p_read)( p_input,
422 &p_input->netlist.p_ts_free[i_base_index],
423 INPUT_TS_READ_ONCE );
424 if( i_packet_size == (-1) )
426 // intf_DbgMsg("Read packet %d %p %d %d\n", i_base_index,
427 // &p_input->netlist.p_ts_free[i_base_index],
428 // p_input->netlist.i_ts_start,
429 // p_input->netlist.i_ts_end);
430 intf_ErrMsg("input error: readv() failed (%s)\n", strerror(errno));
434 if( i_packet_size == 0 )
436 /* No packet has been received, so stop here. */
440 /* Demultiplex the TS packets (1..INPUT_TS_READ_ONCE) received. */
441 for( i_current_index = i_base_index;
442 (i_packet_size -= TS_PACKET_SIZE) >= 0;
445 /* BTW, something REALLY bad could happen if we receive packets with
447 p_ts_packet = (ts_packet_t*)(p_input->netlist.p_ts_free[i_current_index].iov_base);
448 /* Don't cry :-), we are allowed to do that cast, because initially,
449 our buffer was malloc'ed with sizeof(ts_packet_t) */
451 /* Find out if we need this packet and demultiplex. */
452 input_SortPacket( p_input /* for current PIDs and netlist */,
456 if( i_packet_size > 0 )
458 intf_ErrMsg("input error: wrong size\n");
462 /* Remove the TS packets we have just filled from the netlist */
463 #ifdef INPUT_LIFO_TS_NETLIST
464 /* We need to take a lock here while we're calculating index positions. */
465 vlc_mutex_lock( &p_input->netlist.lock );
467 i_meanwhile_released = i_base_index - p_input->netlist.i_ts_index;
468 if( i_meanwhile_released )
470 /* That's where it becomes funny :-). Since we didn't take locks for
471 efficiency reasons, other threads (including ourselves, with
472 input_DemuxPacket) might have released packets to the netlist.
473 So we have to copy these iovec where they should go.
475 BTW, that explains why the TS netlist is
476 (INPUT_MAX_TS +1) + (TS_READ_ONCE -1) large. */
478 i_currently_removed = i_current_index - i_base_index;
479 if( i_meanwhile_released < i_currently_removed )
481 /* Copy all iovecs in that case */
482 memcpy( &p_input->netlist.p_ts_free[p_input->netlist.i_ts_index]
483 + i_currently_removed,
484 &p_input->netlist.p_ts_free[p_input->netlist.i_ts_index],
485 i_meanwhile_released * sizeof(struct iovec) );
489 /* We have fewer places than items, so we only move
490 i_currently_removed of them. */
491 memcpy( &p_input->netlist.p_ts_free[i_base_index],
492 &p_input->netlist.p_ts_free[p_input->netlist.i_ts_index],
493 i_currently_removed * sizeof(struct iovec) );
496 /* Update i_netlist_index with the information gathered above. */
497 p_input->netlist.i_ts_index += i_currently_removed;
501 /* Nothing happened. */
502 p_input->netlist.i_ts_index = i_current_index;
505 vlc_mutex_unlock( &p_input->netlist.lock );
507 #else /* FIFO netlist */
508 /* & is modulo ; that's where we make the loop. */
509 p_input->netlist.i_ts_start = i_current_index & INPUT_MAX_TS;
513 p_input->c_ts_packets_read += i_current_index - i_base_index;
514 p_input->c_bytes += (i_current_index - i_base_index) * TS_PACKET_SIZE;
519 /*******************************************************************************
520 * input_SortPacket: find out whether we need that packet
521 *******************************************************************************/
522 static __inline__ void input_SortPacket( input_thread_t *p_input,
523 ts_packet_t *p_ts_packet )
528 /* Verify that sync_byte, error_indicator and scrambling_control are
530 if( !(p_ts_packet->buffer[0] == 0x47) || (p_ts_packet->buffer[1] & 0x80) ||
531 (p_ts_packet->buffer[3] & 0xc0) )
533 intf_DbgMsg("input debug: invalid TS header (%p)\n", p_ts_packet);
537 /* Get the PID of the packet. Note that ntohs is needed, for endianness
538 purposes (see man page). */
539 i_current_pid = U16_AT(&p_ts_packet->buffer[1]) & 0x1fff;
541 // intf_DbgMsg("input debug: pid %d received (%p)\n",
542 // i_current_pid, p_ts_packet);
544 /* Lock current ES state. */
545 vlc_mutex_lock( &p_input->es_lock );
547 /* Verify that we actually want this PID. */
548 for( i_es_loop = 0; i_es_loop < INPUT_MAX_SELECTED_ES; i_es_loop++ )
550 if( p_input->pp_selected_es[i_es_loop] != NULL)
552 if( (*p_input->pp_selected_es[i_es_loop]).i_id
555 /* Don't need the lock anymore, since the value pointed
556 out by p_input->pp_selected_es[i_es_loop] can only be
557 modified from inside the input_thread (by the PSI
558 decoder): interface thread is only allowed to modify
559 the pp_selected_es table */
560 vlc_mutex_unlock( &p_input->es_lock );
562 /* We're interested. Pass it to the demultiplexer. */
563 input_DemuxTS( p_input, p_ts_packet,
564 p_input->pp_selected_es[i_es_loop] );
570 /* pp_selected_es should not contain any hole. */
574 vlc_mutex_unlock( &p_input->es_lock );
577 /* We weren't interested in receiving this packet. Give it back to the
579 // intf_DbgMsg("SortPacket: freeing unwanted TS %p (pid %d)\n", p_ts_packet,
580 // U16_AT(&p_ts_packet->buffer[1]) & 0x1fff);
581 input_NetlistFreeTS( p_input, p_ts_packet );
583 p_input->c_ts_packets_trashed++;
587 /*******************************************************************************
588 * input_DemuxTS: first step of demultiplexing: the TS header
589 *******************************************************************************
590 * Stream must also only contain PES and PSI, so PID must have been filtered
591 *******************************************************************************/
592 static __inline__ void input_DemuxTS( input_thread_t *p_input,
593 ts_packet_t *p_ts_packet,
594 es_descriptor_t *p_es_descriptor )
597 boolean_t b_adaption; /* Adaption field is present */
598 boolean_t b_payload; /* Packet carries payload */
599 boolean_t b_unit_start; /* A PSI or a PES start in the packet */
600 boolean_t b_trash = 0; /* Must the packet be trashed ? */
601 boolean_t b_lost = 0; /* Was there a packet lost ? */
605 ASSERT(p_es_descriptor);
607 #define p (p_ts_packet->buffer)
609 // intf_DbgMsg("input debug: TS-demultiplexing packet %p, pid %d, number %d\n",
610 // p_ts_packet, U16_AT(&p[1]) & 0x1fff, p[3] & 0x0f);
613 p_es_descriptor->c_packets++;
614 p_es_descriptor->c_bytes += TS_PACKET_SIZE;
617 /* Extract flags values from TS common header. */
618 b_unit_start = (p[1] & 0x40);
619 b_adaption = (p[3] & 0x20);
620 b_payload = (p[3] & 0x10);
622 /* Extract adaption field informations if any */
625 /* We don't have any adaptation_field, so payload start immediately
626 after the 4 byte TS header */
627 p_ts_packet->i_payload_start = 4;
631 /* p[4] is adaptation_field_length minus one */
632 p_ts_packet->i_payload_start = 5 + p[4];
634 /* The adaption field can be limited to the adaptation_field_length byte,
635 so that there is nothing to do: skip this possibility */
638 /* If the packet has both adaptation_field and payload, adaptation_field
639 cannot be more than 182 bytes long; if there is only an
640 adaptation_field, it must fill the next 183 bytes. */
641 if( b_payload ? (p[4] > 182) : (p[4] != 183) )
643 intf_DbgMsg("input debug: invalid TS adaptation field (%p)\n",
646 p_es_descriptor->c_invalid_packets++;
651 /* No we are sure that the byte containing flags is present: read it */
654 /* discontinuity_indicator */
657 intf_DbgMsg("discontinuity_indicator encountered by TS demux " \
658 "(position read: %d, saved: %d)\n", p[5] & 0x80,
659 p_es_descriptor->i_continuity_counter);
661 /* If the PID carries the PCR, there will be a system time-base
662 discontinuity. We let the PCR decoder handle that. */
663 p_es_descriptor->b_discontinuity = 1;
665 /* There also may be a continuity_counter discontinuity:
666 resynchronise our counter with the one of the stream */
667 p_es_descriptor->i_continuity_counter = (p[3] & 0x0f) - 1;
670 /* random_access_indicator */
671 p_es_descriptor->b_random |= p[5] & 0x40;
673 /* If this is a PCR_PID, and this TS packet contains a PCR,
674 we pass it along to the PCR decoder. */
675 if( (p_es_descriptor->b_pcr) && (p[5] & 0x10) )
677 /* There should be a PCR field in the packet, check if the
678 adaption field is long enough to carry it */
681 /* Call the PCR decoder */
682 input_PcrDecode( p_input, p_es_descriptor, &p[6] );
689 /* Check the continuity of the stream. */
690 i_dummy = ((p[3] & 0x0f) - p_es_descriptor->i_continuity_counter) & 0x0f;
693 /* Everything is ok, just increase our counter */
694 p_es_descriptor->i_continuity_counter++;
698 if( !b_payload && i_dummy == 0 )
700 /* This is a packet without payload, this is allowed by the draft
701 As there is nothing interessant in this packet (except PCR that
702 have already been handled), we can trash the packet. */
703 intf_DbgMsg("Packet without payload received by TS demux\n");
706 else if( i_dummy <= 0 )
708 /* Duplicate packet: mark it as being to be trashed. */
709 intf_DbgMsg("Duplicate packet received by TS demux\n");
712 else if( p_es_descriptor->i_continuity_counter == 0xFF )
714 /* This means that the packet is the first one we receive for this
715 ES since the continuity counter ranges between 0 and 0x0F
716 excepts when it has been initialized by the input: Init the
717 counter to the correct value. */
718 intf_DbgMsg("First packet for PID %d received by TS demux\n",
719 p_es_descriptor->i_id);
720 p_es_descriptor->i_continuity_counter = (p[3] & 0x0f);
724 /* This can indicate that we missed a packet or that the
725 continuity_counter wrapped and we received a dup packet: as we
726 don't know, do as if we missed a packet to be sure to recover
727 from this situation */
728 intf_DbgMsg("Packet lost by TS demux: current %d, packet %d\n",
729 p_es_descriptor->i_continuity_counter & 0x0f,
732 p_es_descriptor->i_continuity_counter = p[3] & 0x0f;
736 /* Trash the packet if it has no payload or if it is bad */
739 input_NetlistFreeTS( p_input, p_ts_packet );
741 p_input->c_ts_packets_trashed++;
746 if( p_es_descriptor->b_psi )
748 /* The payload contains PSI tables */
749 input_DemuxPSI( p_input, p_ts_packet, p_es_descriptor,
750 b_unit_start, b_lost );
754 /* The payload carries a PES stream */
755 input_DemuxPES( p_input, p_ts_packet, p_es_descriptor,
756 b_unit_start, b_lost );
766 /*******************************************************************************
768 *******************************************************************************
769 * Gather a PES packet and analyzes its header.
770 *******************************************************************************/
771 static __inline__ void input_DemuxPES( input_thread_t *p_input,
772 ts_packet_t *p_ts_packet,
773 es_descriptor_t *p_es_descriptor,
774 boolean_t b_unit_start,
775 boolean_t b_packet_lost )
777 decoder_fifo_t * p_fifo;
778 u8 i_pes_header_size;
780 pes_packet_t* p_last_pes;
782 int i_ts_payload_size;
785 #define p_pes (p_es_descriptor->p_pes_packet)
789 ASSERT(p_es_descriptor);
791 // intf_DbgMsg("PES-demultiplexing %p (%p)\n", p_ts_packet, p_pes);
793 /* If we lost data, discard the PES packet we are trying to reassemble
794 if any and wait for the beginning of a new one in order to synchronise
796 if( b_packet_lost && p_pes != NULL )
798 intf_DbgMsg("PES %p trashed because of packet lost\n", p_pes);
799 input_NetlistFreePES( p_input, p_pes );
803 /* If the TS packet contains the begining of a new PES packet, and if we
804 were reassembling a PES packet, then the PES should be complete now,
805 so parse its header and give it to the decoders */
806 if( b_unit_start && p_pes != NULL )
808 // intf_DbgMsg("End of PES packet %p\n", p_pes);
810 /* Parse the header. The header has a variable length, but in order
811 to improve the algorithm, we will read the 14 bytes we may be
813 p_ts = p_pes->p_first_ts;
814 i_ts_payload_size = p_ts->i_payload_end - p_ts->i_payload_start;
817 if(i_ts_payload_size >= PES_HEADER_SIZE)
819 /* This part of the header entirely fits in the payload of
820 the first TS packet */
821 p_pes->p_pes_header = &(p_ts->buffer[p_ts->i_payload_start]);
825 /* This part of the header does not fit in the current TS packet:
826 copy the part of the header we are interested in to the
827 p_pes_header_save buffer. The buffer is dynamicly allocated if
828 needed so it's time expensive but this situation almost never
830 intf_DbgMsg("Code never tested encountered, WARNING ! (benny)\n");
831 if( !p_pes->p_pes_header_save )
832 p_pes->p_pes_header_save = malloc(PES_HEADER_SIZE);
836 memcpy(p_pes->p_pes_header_save + i_dummy,
837 &p_ts->buffer[p_ts->i_payload_start], i_ts_payload_size);
838 i_dummy += i_ts_payload_size;
840 p_ts = p_ts->p_next_ts;
843 /* The payload of the PES packet is shorter than the 14 bytes
844 we would read. This means that high packet lost occured
845 so the PES won't be usefull for any decoder. Moreover,
846 this should never happen so we can trash the packet and
847 exit roughly without regrets */
848 intf_DbgMsg("PES packet too short: trashed\n");
849 input_NetlistFreePES( p_input, p_pes );
855 i_ts_payload_size = p_ts->i_payload_end - p_ts->i_payload_start;
857 while(i_ts_payload_size + i_dummy < PES_HEADER_SIZE);
859 /* This last TS packet is partly header, partly payload, so just
860 copy the header part */
861 memcpy(p_pes->p_pes_header_save + i_dummy,
862 &p_ts->buffer[p_ts->i_payload_start],
863 PES_HEADER_SIZE - i_dummy);
865 /* The header must be read in the buffer not in any TS packet */
866 p_pes->p_pes_header = p_pes->p_pes_header_save;
869 /* Now we have the part of the PES header we were interested in:
872 /* First read the 6 header bytes common to all PES packets:
873 use them to test the PES validity */
874 if( (p_pes->p_pes_header[0] || p_pes->p_pes_header[1] ||
875 (p_pes->p_pes_header[2] != 1)) ||
876 /* packet_start_code_prefix != 0x000001 */
877 ((i_dummy = U16_AT(p_pes->p_pes_header + 4)) &&
878 (i_dummy + 6 != p_pes->i_pes_size)) )
879 /* PES_packet_length is set and != total received payload */
881 /* Trash the packet and set p_pes to NULL to be sure the next PES
882 packet will have its b_data_lost flag set */
883 intf_DbgMsg("Corrupted PES packet received: trashed\n");
884 input_NetlistFreePES( p_input, p_pes );
890 /* The PES packet is valid. Check its type to test if it may
891 carry additional informations in a header extension */
892 p_pes->i_stream_id = p_pes->p_pes_header[3];
894 switch( p_pes->i_stream_id )
896 case 0xBE: /* Padding */
897 case 0xBC: /* Program stream map */
898 case 0xBF: /* Private stream 2 */
901 case 0xFF: /* Program stream directory */
902 case 0xF2: /* DSMCC stream */
903 case 0xF8: /* ITU-T H.222.1 type E stream */
904 /* The payload begins immediatly after the 6 bytes header, so
905 we have finished with the parsing */
906 i_pes_header_size = 6;
910 /* The PES header contains at least 3 more bytes: parse them */
911 p_pes->b_data_alignment = p_pes->p_pes_header[6] & 0x04;
912 p_pes->b_has_pts = p_pes->p_pes_header[7] & 0x80;
913 i_pes_header_size = 9 + p_pes->p_pes_header[8];
915 /* Now parse the optional header extensions (in the limit of
917 if( p_pes->b_has_pts )
919 pcr_descriptor_t * p_pcr;
921 p_pcr = p_input->p_pcr;
924 ( ((mtime_t)(p_pes->p_pes_header[9] & 0x0E) << 29) |
925 (((mtime_t)U16_AT(p_pes->p_pes_header + 10) << 14) - (1 << 14)) |
926 ((mtime_t)U16_AT(p_pes->p_pes_header + 12) >> 1) ) * 300;
929 if( p_pcr->i_synchro_state )
931 switch( p_pcr->i_synchro_state )
933 case SYNCHRO_NOT_STARTED:
934 p_pes->b_has_pts = 0;
938 p_pes->i_pts += p_pcr->delta_pcr;
939 p_pcr->delta_absolute = mdate() - p_pes->i_pts + 500000;
940 p_pes->i_pts += p_pcr->delta_absolute;
941 p_pcr->i_synchro_state = 0;
944 case SYNCHRO_REINIT: /* We skip a PES */
945 p_pes->b_has_pts = 0;
946 p_pcr->i_synchro_state = SYNCHRO_START;
952 p_pes->i_pts += p_pcr->delta_pcr + p_pcr->delta_absolute;
958 /* Now we've parsed the header, we just have to indicate in some
959 specific TS packets where the PES payload begins (renumber
960 i_payload_start), so that the decoders can find the beginning
961 of their data right out of the box. */
962 p_ts = p_pes->p_first_ts;
963 i_ts_payload_size = p_ts->i_payload_end - p_ts->i_payload_start;
964 while( i_pes_header_size > i_ts_payload_size )
966 /* These packets are entirely filled by the PES header. */
967 i_pes_header_size -= i_ts_payload_size;
968 p_ts->i_payload_start = p_ts->i_payload_end;
969 /* Go to the next TS packet: here we won't have to test it is
970 not NULL because we trash the PES packets when packet lost
972 p_ts = p_ts->p_next_ts;
973 i_ts_payload_size = p_ts->i_payload_end - p_ts->i_payload_start;
975 /* This last packet is partly header, partly payload. */
976 p_ts->i_payload_start += i_pes_header_size;
978 /* Now we can eventually put the PES packet in the decoder's
980 switch( p_es_descriptor->i_type )
984 p_fifo = &(((vdec_thread_t*)(p_es_descriptor->p_dec))->fifo);
988 p_fifo = &(((adec_thread_t*)(p_es_descriptor->p_dec))->fifo);
991 /* This should never happen. */
992 intf_DbgMsg("Unknown stream type (%d, %d): PES trashed\n",
993 p_es_descriptor->i_id, p_es_descriptor->i_type);
1000 vlc_mutex_lock( &p_fifo->data_lock );
1001 if( DECODER_FIFO_ISFULL( *p_fifo ) )
1003 /* The FIFO is full !!! This should not happen. */
1005 p_input->c_ts_packets_trashed += p_pes->i_ts_packets;
1006 p_es_descriptor->c_invalid_packets += p_pes->i_ts_packets;
1008 input_NetlistFreePES( p_input, p_pes );
1009 intf_DbgMsg("PES trashed - fifo full ! (%d, %d)\n",
1010 p_es_descriptor->i_id, p_es_descriptor->i_type);
1014 // intf_DbgMsg("Putting %p into fifo %p/%d\n",
1015 // p_pes, p_fifo, p_fifo->i_end);
1016 p_fifo->buffer[p_fifo->i_end] = p_pes;
1017 DECODER_FIFO_INCEND( *p_fifo );
1019 /* Warn the decoder that it's got work to do. */
1020 vlc_cond_signal( &p_fifo->data_wait );
1022 vlc_mutex_unlock( &p_fifo->data_lock );
1026 intf_DbgMsg("No fifo to receive PES %p: trash\n", p_pes);
1028 p_input->c_ts_packets_trashed += p_pes->i_ts_packets;
1029 p_es_descriptor->c_invalid_packets += p_pes->i_ts_packets;
1031 input_NetlistFreePES( p_input, p_pes );
1037 /* If we are at the beginning of a new PES packet, we must fetch a new
1038 PES buffer to begin with the reassembly of this PES packet. This is
1039 also here that we can synchronise with the stream if we we lost
1040 packets or if the decoder has just started */
1045 /* Get a new one PES from the PES netlist. */
1046 if( (p_pes = input_NetlistGetPES( p_input )) == (NULL) )
1048 /* PES netlist is empty ! */
1049 p_input->b_error = 1;
1053 // intf_DbgMsg("New PES packet %p (first TS: %p)\n", p_pes, p_ts_packet);
1055 /* Init the PES fields so that the first TS packet could be correctly
1056 added to the PES packet (see below) */
1057 p_pes->p_first_ts = p_ts_packet;
1058 p_pes->p_last_ts = NULL;
1060 /* If the last pes packet was null, this means that the synchronisation
1061 was lost and so warn the decoder that he will have to find a way to
1064 p_pes->b_data_loss = 1;
1066 /* Read the b_random_access flag status and then reinit it */
1067 p_pes->b_random_access = p_es_descriptor->b_random;
1068 p_es_descriptor->b_random = 0;
1073 /* If we are synchronised with the stream, and so if we are ready to
1074 receive correctly the data, add the TS packet to the current PES
1078 // intf_DbgMsg("Adding TS %p to PES %p\n", p_ts_packet, p_pes);
1080 /* Size of the payload carried in the TS packet */
1081 i_ts_payload_size = p_ts_packet->i_payload_end -
1082 p_ts_packet->i_payload_start;
1084 /* Update the relations between the TS packets */
1085 p_ts_packet->p_prev_ts = p_pes->p_last_ts;
1086 p_ts_packet->p_next_ts = NULL;
1087 if( p_pes->i_ts_packets != 0 )
1089 /* Regarder si il serait pas plus efficace de ne creer que les liens
1090 precedent->suivant pour le moment, et les liens suivant->precedent
1091 quand le paquet est termine */
1092 /* Otherwise it is the first TS packet. */
1093 p_pes->p_last_ts->p_next_ts = p_ts_packet;
1095 /* Now add the TS to the PES packet */
1096 p_pes->p_last_ts = p_ts_packet;
1097 p_pes->i_ts_packets++;
1098 p_pes->i_pes_size += i_ts_payload_size;
1102 i_dummy = p_ts_packet->i_payload_end - p_ts_packet->i_payload_start;
1103 p_es_descriptor->c_payload_bytes += i_dummy;
1108 /* Since we don't use the TS packet to build a PES packet, we don't
1109 need it anymore, so give it back to the netlist */
1110 // intf_DbgMsg("Trashing TS %p: no PES being build\n", p_ts_packet);
1111 input_NetlistFreeTS( p_input, p_ts_packet );
1120 /*******************************************************************************
1122 *******************************************************************************
1123 * Notice that current ES state has been locked by input_SortPacket. (No more true,
1124 * changed by benny - See if it's ok, and definitely change the code ???????? )
1125 *******************************************************************************/
1126 static __inline__ void input_DemuxPSI( input_thread_t *p_input,
1127 ts_packet_t *p_ts_packet,
1128 es_descriptor_t *p_es_descriptor,
1129 boolean_t b_unit_start, boolean_t b_packet_lost )
1131 int i_data_offset; /* Offset of the interesting data in the TS packet */
1132 u16 i_data_length; /* Length of those data */
1133 //boolean_t b_first_section; /* Was there another section in the TS packet ? */
1136 ASSERT(p_ts_packet);
1137 ASSERT(p_es_descriptor);
1139 #define p_psi (p_es_descriptor->p_psi_section)
1141 // intf_DbgMsg( "input debug: PSI demultiplexing %p (%p)\n", p_ts_packet, p_input);
1143 // 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);
1146 /* Try to find the beginning of the payload in the packet to initialise
1147 the do-while loop that follows -> Compute the i_data_offset variable:
1148 by default, the value is set so that we won't enter in the while loop.
1149 It will be set to a correct value if the data are not corrupted */
1150 i_data_offset = TS_PACKET_SIZE;
1152 /* Has the reassembly of a section already began in a previous packet ? */
1153 if( p_psi->b_running_section )
1155 /* Was data lost since the last TS packet ? */
1158 /* Discard the packet and wait for the begining of a new one to resynch */
1159 p_psi->b_running_section = 0;
1160 p_psi->i_current_position = 0;
1161 intf_DbgMsg( "PSI section(s) discarded due to packet loss\n" );
1165 /* The data that complete a previously began section are always at
1166 the beginning of the TS payload... */
1167 i_data_offset = p_ts_packet->i_payload_start;
1168 /* ...Unless there is a pointer field, that we have to bypass */
1171 // intf_DbgMsg( "New part of the section received at offset %d\n", i_data_offset );
1174 /* We are looking for the beginning of a new section */
1179 /* Get the offset at which the data for that section can be found
1180 The offset is stored in the pointer_field since we are interested in
1181 the first section of the TS packet. Note that the +1 is to bypass
1182 the pointer field */
1183 i_data_offset = p_ts_packet->i_payload_start +
1184 p_ts_packet->buffer[p_ts_packet->i_payload_start] + 1;
1185 // intf_DbgMsg( "New section beginning at offset %d in TS packet\n", i_data_offset );
1189 /* This may either mean that the TS is bad or that the packet contains
1190 the end of a section that had been discarded in a previous loop:
1191 trash the TS packet since we cannot do anything with those data: */
1192 p_psi->b_running_section = 0;
1193 p_psi->i_current_position = 0;
1194 intf_DbgMsg( "PSI packet discarded due to lack of synchronisation\n" );
1198 /* The section we will deal with during the first iteration of the following
1199 loop is the first one contained in the TS packet */
1200 // b_first_section = 1;
1202 /* Reassemble the pieces of sections contained in the TS packet and decode
1203 the sections that could have been completed.
1204 Stop when we reach the end of the packet or stuffing bytes */
1205 while( i_data_offset < TS_PACKET_SIZE && p_ts_packet->buffer[i_data_offset] != 0xFF )
1207 /* If the current section is a new one, reinit the data fields of the p_psi
1208 struct to start its decoding */
1209 if( !p_psi->b_running_section )
1211 /* Read the length of the new section */
1212 p_psi->i_length = (U16_AT(&p_ts_packet->buffer[i_data_offset+1]) & 0xFFF) + 3;
1213 // intf_DbgMsg( "Section length %d\n", p_psi->i_length );
1214 if( p_psi->i_length > PSI_SECTION_SIZE )
1216 /* The TS packet is corrupted, stop here to avoid possible a seg fault */
1217 intf_DbgMsg( "PSI Section size is too big, aborting its reception\n" );
1221 /* Init the reassembly of that section */
1222 p_psi->b_running_section = 1;
1223 p_psi->i_current_position = 0;
1226 /* Compute the length of data related to the section in this TS packet */
1227 if( p_psi->i_length - p_psi->i_current_position > TS_PACKET_SIZE - i_data_offset)
1228 i_data_length = TS_PACKET_SIZE - i_data_offset;
1230 i_data_length = p_psi->i_length - p_psi->i_current_position;
1232 /* Copy those data in the section buffer */
1233 memcpy( &p_psi->buffer[p_psi->i_current_position], &p_ts_packet->buffer[i_data_offset],
1236 /* Interesting data are now after the ones we copied, since no gap is
1237 allowed between 2 sections in a TS packets */
1238 i_data_offset += i_data_length;
1240 /* Decode the packet if it is now complete */
1241 if (p_psi->i_length == p_psi->i_current_position + i_data_length)
1243 /* Packet is complete, decode it */
1244 // intf_DbgMsg( "SECTION COMPLETE: starting decoding of its data\n" );
1245 input_PsiDecode( p_input, p_psi );
1247 /* Prepare the buffer to receive a new section */
1248 p_psi->i_current_position = 0;
1249 p_psi->b_running_section = 0;
1251 /* The new section won't be the first anymore */
1252 //b_first_section = 0;
1256 /* Prepare the buffer to receive the next part of the section */
1257 p_psi->i_current_position += i_data_length;
1258 // intf_DbgMsg( "Section not complete, waiting for the end\n" );
1261 // intf_DbgMsg( "Must loop ? Next data offset: %d, stuffing: %d\n",
1262 // i_data_offset, p_ts_packet->buffer[i_data_offset] );
1265 /* Relase the TS packet, we don't need it anymore */
1266 input_NetlistFreeTS( p_input, p_ts_packet );