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) );
353 ac3dec_DestroyThread( (ac3dec_thread_t *)(p_input->pp_selected_es[i_es_loop]->p_dec) );
362 /* pp_selected_es should not contain any hole. */
367 input_NetlistClean( p_input ); /* clean netlist */
368 input_PsiClean( p_input ); /* clean PSI information */
369 input_PcrClean( p_input ); /* clean PCR information */
370 free( p_input ); /* free input_thread structure */
372 intf_DbgMsg("input debug: EndThread(%p)\n", p_input);
375 /*******************************************************************************
376 * input_ReadPacket: reads a packet from the network or the file
377 *******************************************************************************/
378 static __inline__ int input_ReadPacket( input_thread_t *p_input )
380 int i_base_index; /* index of the first free iovec */
383 #ifdef INPUT_LIFO_TS_NETLIST
384 int i_meanwhile_released;
385 int i_currently_removed;
387 ts_packet_t * p_ts_packet;
389 /* In this function, we only care about the TS netlist. PES netlist
390 * is for the demultiplexer. */
391 #ifdef INPUT_LIFO_TS_NETLIST
392 i_base_index = p_input->netlist.i_ts_index;
394 /* Verify that we still have packets in the TS netlist */
395 if( (INPUT_MAX_TS + INPUT_TS_READ_ONCE - 1 - p_input->netlist.i_ts_index) <= INPUT_TS_READ_ONCE )
397 intf_ErrMsg("input error: TS netlist is empty !\n");
401 #else /* FIFO netlist */
402 i_base_index = p_input->netlist.i_ts_start;
403 if( p_input->netlist.i_ts_start + INPUT_TS_READ_ONCE -1 > INPUT_MAX_TS )
405 /* The netlist is splitted in 2 parts. We must gather them to consolidate
406 the FIFO (we make the loop easily in having the same iovec at the far
407 end and in the beginning of netlist_free).
408 That's why the netlist is (INPUT_MAX_TS +1) + (INPUT_TS_READ_ONCE -1)
410 memcpy( p_input->netlist.p_ts_free + INPUT_MAX_TS + 1,
411 p_input->netlist.p_ts_free,
412 (p_input->netlist.i_ts_start + INPUT_TS_READ_ONCE - 1 - INPUT_MAX_TS)
413 * sizeof(struct iovec) );
416 /* Verify that we still have packets in the TS netlist */
417 if( ((p_input->netlist.i_ts_end -1 - p_input->netlist.i_ts_start) & INPUT_MAX_TS) <= INPUT_TS_READ_ONCE )
419 intf_ErrMsg("input error: TS netlist is empty !\n");
422 #endif /* FIFO netlist */
424 /* Scatter read the buffer. */
425 i_packet_size = (*p_input->p_read)( p_input,
426 &p_input->netlist.p_ts_free[i_base_index],
427 INPUT_TS_READ_ONCE );
428 if( i_packet_size == (-1) )
430 // intf_DbgMsg("Read packet %d %p %d %d\n", i_base_index,
431 // &p_input->netlist.p_ts_free[i_base_index],
432 // p_input->netlist.i_ts_start,
433 // p_input->netlist.i_ts_end);
434 intf_ErrMsg("input error: readv() failed (%s)\n", strerror(errno));
438 if( i_packet_size == 0 )
440 /* No packet has been received, so stop here. */
444 /* Demultiplex the TS packets (1..INPUT_TS_READ_ONCE) received. */
445 for( i_current_index = i_base_index;
446 (i_packet_size -= TS_PACKET_SIZE) >= 0;
449 /* BTW, something REALLY bad could happen if we receive packets with
451 p_ts_packet = (ts_packet_t*)(p_input->netlist.p_ts_free[i_current_index].iov_base);
452 /* Don't cry :-), we are allowed to do that cast, because initially,
453 our buffer was malloc'ed with sizeof(ts_packet_t) */
455 /* Find out if we need this packet and demultiplex. */
456 input_SortPacket( p_input /* for current PIDs and netlist */,
460 if( i_packet_size > 0 )
462 intf_ErrMsg("input error: wrong size\n");
466 /* Remove the TS packets we have just filled from the netlist */
467 #ifdef INPUT_LIFO_TS_NETLIST
468 /* We need to take a lock here while we're calculating index positions. */
469 vlc_mutex_lock( &p_input->netlist.lock );
471 i_meanwhile_released = i_base_index - p_input->netlist.i_ts_index;
472 if( i_meanwhile_released )
474 /* That's where it becomes funny :-). Since we didn't take locks for
475 efficiency reasons, other threads (including ourselves, with
476 input_DemuxPacket) might have released packets to the netlist.
477 So we have to copy these iovec where they should go.
479 BTW, that explains why the TS netlist is
480 (INPUT_MAX_TS +1) + (TS_READ_ONCE -1) large. */
482 i_currently_removed = i_current_index - i_base_index;
483 if( i_meanwhile_released < i_currently_removed )
485 /* Copy all iovecs in that case */
486 memcpy( &p_input->netlist.p_ts_free[p_input->netlist.i_ts_index]
487 + i_currently_removed,
488 &p_input->netlist.p_ts_free[p_input->netlist.i_ts_index],
489 i_meanwhile_released * sizeof(struct iovec) );
493 /* We have fewer places than items, so we only move
494 i_currently_removed of them. */
495 memcpy( &p_input->netlist.p_ts_free[i_base_index],
496 &p_input->netlist.p_ts_free[p_input->netlist.i_ts_index],
497 i_currently_removed * sizeof(struct iovec) );
500 /* Update i_netlist_index with the information gathered above. */
501 p_input->netlist.i_ts_index += i_currently_removed;
505 /* Nothing happened. */
506 p_input->netlist.i_ts_index = i_current_index;
509 vlc_mutex_unlock( &p_input->netlist.lock );
511 #else /* FIFO netlist */
512 /* & is modulo ; that's where we make the loop. */
513 p_input->netlist.i_ts_start = i_current_index & INPUT_MAX_TS;
517 p_input->c_ts_packets_read += i_current_index - i_base_index;
518 p_input->c_bytes += (i_current_index - i_base_index) * TS_PACKET_SIZE;
523 /*******************************************************************************
524 * input_SortPacket: find out whether we need that packet
525 *******************************************************************************/
526 static __inline__ void input_SortPacket( input_thread_t *p_input,
527 ts_packet_t *p_ts_packet )
532 /* Verify that sync_byte, error_indicator and scrambling_control are
534 if( !(p_ts_packet->buffer[0] == 0x47) || (p_ts_packet->buffer[1] & 0x80) ||
535 (p_ts_packet->buffer[3] & 0xc0) )
537 intf_DbgMsg("input debug: invalid TS header (%p)\n", p_ts_packet);
541 /* Get the PID of the packet. Note that ntohs is needed, for endianness
542 purposes (see man page). */
543 i_current_pid = U16_AT(&p_ts_packet->buffer[1]) & 0x1fff;
545 // intf_DbgMsg("input debug: pid %d received (%p)\n",
546 // i_current_pid, p_ts_packet);
548 /* Lock current ES state. */
549 vlc_mutex_lock( &p_input->es_lock );
551 /* Verify that we actually want this PID. */
552 for( i_es_loop = 0; i_es_loop < INPUT_MAX_SELECTED_ES; i_es_loop++ )
554 if( p_input->pp_selected_es[i_es_loop] != NULL)
556 if( (*p_input->pp_selected_es[i_es_loop]).i_id
559 /* Don't need the lock anymore, since the value pointed
560 out by p_input->pp_selected_es[i_es_loop] can only be
561 modified from inside the input_thread (by the PSI
562 decoder): interface thread is only allowed to modify
563 the pp_selected_es table */
564 vlc_mutex_unlock( &p_input->es_lock );
566 /* We're interested. Pass it to the demultiplexer. */
567 input_DemuxTS( p_input, p_ts_packet,
568 p_input->pp_selected_es[i_es_loop] );
574 /* pp_selected_es should not contain any hole. */
578 vlc_mutex_unlock( &p_input->es_lock );
581 /* We weren't interested in receiving this packet. Give it back to the
583 // intf_DbgMsg("SortPacket: freeing unwanted TS %p (pid %d)\n", p_ts_packet,
584 // U16_AT(&p_ts_packet->buffer[1]) & 0x1fff);
585 input_NetlistFreeTS( p_input, p_ts_packet );
587 p_input->c_ts_packets_trashed++;
591 /*******************************************************************************
592 * input_DemuxTS: first step of demultiplexing: the TS header
593 *******************************************************************************
594 * Stream must also only contain PES and PSI, so PID must have been filtered
595 *******************************************************************************/
596 static __inline__ void input_DemuxTS( input_thread_t *p_input,
597 ts_packet_t *p_ts_packet,
598 es_descriptor_t *p_es_descriptor )
601 boolean_t b_adaption; /* Adaption field is present */
602 boolean_t b_payload; /* Packet carries payload */
603 boolean_t b_unit_start; /* A PSI or a PES start in the packet */
604 boolean_t b_trash = 0; /* Must the packet be trashed ? */
605 boolean_t b_lost = 0; /* Was there a packet lost ? */
609 ASSERT(p_es_descriptor);
611 #define p (p_ts_packet->buffer)
613 // intf_DbgMsg("input debug: TS-demultiplexing packet %p, pid %d, number %d\n",
614 // p_ts_packet, U16_AT(&p[1]) & 0x1fff, p[3] & 0x0f);
617 p_es_descriptor->c_packets++;
618 p_es_descriptor->c_bytes += TS_PACKET_SIZE;
621 /* Extract flags values from TS common header. */
622 b_unit_start = (p[1] & 0x40);
623 b_adaption = (p[3] & 0x20);
624 b_payload = (p[3] & 0x10);
626 /* Extract adaption field informations if any */
629 /* We don't have any adaptation_field, so payload start immediately
630 after the 4 byte TS header */
631 p_ts_packet->i_payload_start = 4;
635 /* p[4] is adaptation_field_length minus one */
636 p_ts_packet->i_payload_start = 5 + p[4];
638 /* The adaption field can be limited to the adaptation_field_length byte,
639 so that there is nothing to do: skip this possibility */
642 /* If the packet has both adaptation_field and payload, adaptation_field
643 cannot be more than 182 bytes long; if there is only an
644 adaptation_field, it must fill the next 183 bytes. */
645 if( b_payload ? (p[4] > 182) : (p[4] != 183) )
647 intf_DbgMsg("input debug: invalid TS adaptation field (%p)\n",
650 p_es_descriptor->c_invalid_packets++;
655 /* No we are sure that the byte containing flags is present: read it */
658 /* discontinuity_indicator */
661 intf_DbgMsg("discontinuity_indicator encountered by TS demux " \
662 "(position read: %d, saved: %d)\n", p[5] & 0x80,
663 p_es_descriptor->i_continuity_counter);
665 /* If the PID carries the PCR, there will be a system time-base
666 discontinuity. We let the PCR decoder handle that. */
667 p_es_descriptor->b_discontinuity = 1;
669 /* There also may be a continuity_counter discontinuity:
670 resynchronise our counter with the one of the stream */
671 p_es_descriptor->i_continuity_counter = (p[3] & 0x0f) - 1;
674 /* random_access_indicator */
675 p_es_descriptor->b_random |= p[5] & 0x40;
677 /* If this is a PCR_PID, and this TS packet contains a PCR,
678 we pass it along to the PCR decoder. */
679 if( (p_es_descriptor->b_pcr) && (p[5] & 0x10) )
681 /* There should be a PCR field in the packet, check if the
682 adaption field is long enough to carry it */
685 /* Call the PCR decoder */
686 input_PcrDecode( p_input, p_es_descriptor, &p[6] );
693 /* Check the continuity of the stream. */
694 i_dummy = ((p[3] & 0x0f) - p_es_descriptor->i_continuity_counter) & 0x0f;
697 /* Everything is ok, just increase our counter */
698 p_es_descriptor->i_continuity_counter++;
702 if( !b_payload && i_dummy == 0 )
704 /* This is a packet without payload, this is allowed by the draft
705 As there is nothing interessant in this packet (except PCR that
706 have already been handled), we can trash the packet. */
707 intf_DbgMsg("Packet without payload received by TS demux\n");
710 else if( i_dummy <= 0 )
712 /* Duplicate packet: mark it as being to be trashed. */
713 intf_DbgMsg("Duplicate packet received by TS demux\n");
716 else if( p_es_descriptor->i_continuity_counter == 0xFF )
718 /* This means that the packet is the first one we receive for this
719 ES since the continuity counter ranges between 0 and 0x0F
720 excepts when it has been initialized by the input: Init the
721 counter to the correct value. */
722 intf_DbgMsg("First packet for PID %d received by TS demux\n",
723 p_es_descriptor->i_id);
724 p_es_descriptor->i_continuity_counter = (p[3] & 0x0f);
728 /* This can indicate that we missed a packet or that the
729 continuity_counter wrapped and we received a dup packet: as we
730 don't know, do as if we missed a packet to be sure to recover
731 from this situation */
732 intf_DbgMsg("Packet lost by TS demux: current %d, packet %d\n",
733 p_es_descriptor->i_continuity_counter & 0x0f,
736 p_es_descriptor->i_continuity_counter = p[3] & 0x0f;
740 /* Trash the packet if it has no payload or if it is bad */
743 input_NetlistFreeTS( p_input, p_ts_packet );
745 p_input->c_ts_packets_trashed++;
750 if( p_es_descriptor->b_psi )
752 /* The payload contains PSI tables */
753 input_DemuxPSI( p_input, p_ts_packet, p_es_descriptor,
754 b_unit_start, b_lost );
758 /* The payload carries a PES stream */
759 input_DemuxPES( p_input, p_ts_packet, p_es_descriptor,
760 b_unit_start, b_lost );
770 /*******************************************************************************
772 *******************************************************************************
773 * Gather a PES packet and analyzes its header.
774 *******************************************************************************/
775 static __inline__ void input_DemuxPES( input_thread_t *p_input,
776 ts_packet_t *p_ts_packet,
777 es_descriptor_t *p_es_descriptor,
778 boolean_t b_unit_start,
779 boolean_t b_packet_lost )
781 decoder_fifo_t * p_fifo;
782 u8 i_pes_header_size;
784 pes_packet_t* p_last_pes;
786 int i_ts_payload_size;
789 #define p_pes (p_es_descriptor->p_pes_packet)
793 ASSERT(p_es_descriptor);
795 // intf_DbgMsg("PES-demultiplexing %p (%p)\n", p_ts_packet, p_pes);
797 /* If we lost data, discard the PES packet we are trying to reassemble
798 if any and wait for the beginning of a new one in order to synchronise
800 if( b_packet_lost && p_pes != NULL )
802 intf_DbgMsg("PES %p trashed because of packet lost\n", p_pes);
803 input_NetlistFreePES( p_input, p_pes );
807 /* If the TS packet contains the begining of a new PES packet, and if we
808 were reassembling a PES packet, then the PES should be complete now,
809 so parse its header and give it to the decoders */
810 if( b_unit_start && p_pes != NULL )
812 // intf_DbgMsg("End of PES packet %p\n", p_pes);
814 /* Parse the header. The header has a variable length, but in order
815 to improve the algorithm, we will read the 14 bytes we may be
817 p_ts = p_pes->p_first_ts;
818 i_ts_payload_size = p_ts->i_payload_end - p_ts->i_payload_start;
821 if(i_ts_payload_size >= PES_HEADER_SIZE)
823 /* This part of the header entirely fits in the payload of
824 the first TS packet */
825 p_pes->p_pes_header = &(p_ts->buffer[p_ts->i_payload_start]);
829 /* This part of the header does not fit in the current TS packet:
830 copy the part of the header we are interested in to the
831 p_pes_header_save buffer. The buffer is dynamicly allocated if
832 needed so it's time expensive but this situation almost never
834 intf_DbgMsg("Code never tested encountered, WARNING ! (benny)\n");
835 if( !p_pes->p_pes_header_save )
836 p_pes->p_pes_header_save = malloc(PES_HEADER_SIZE);
840 memcpy(p_pes->p_pes_header_save + i_dummy,
841 &p_ts->buffer[p_ts->i_payload_start], i_ts_payload_size);
842 i_dummy += i_ts_payload_size;
844 p_ts = p_ts->p_next_ts;
847 /* The payload of the PES packet is shorter than the 14 bytes
848 we would read. This means that high packet lost occured
849 so the PES won't be usefull for any decoder. Moreover,
850 this should never happen so we can trash the packet and
851 exit roughly without regrets */
852 intf_DbgMsg("PES packet too short: trashed\n");
853 input_NetlistFreePES( p_input, p_pes );
859 i_ts_payload_size = p_ts->i_payload_end - p_ts->i_payload_start;
861 while(i_ts_payload_size + i_dummy < PES_HEADER_SIZE);
863 /* This last TS packet is partly header, partly payload, so just
864 copy the header part */
865 memcpy(p_pes->p_pes_header_save + i_dummy,
866 &p_ts->buffer[p_ts->i_payload_start],
867 PES_HEADER_SIZE - i_dummy);
869 /* The header must be read in the buffer not in any TS packet */
870 p_pes->p_pes_header = p_pes->p_pes_header_save;
873 /* Now we have the part of the PES header we were interested in:
876 /* First read the 6 header bytes common to all PES packets:
877 use them to test the PES validity */
878 if( (p_pes->p_pes_header[0] || p_pes->p_pes_header[1] ||
879 (p_pes->p_pes_header[2] != 1)) ||
880 /* packet_start_code_prefix != 0x000001 */
881 ((i_dummy = U16_AT(p_pes->p_pes_header + 4)) &&
882 (i_dummy + 6 != p_pes->i_pes_size)) )
883 /* PES_packet_length is set and != total received payload */
885 /* Trash the packet and set p_pes to NULL to be sure the next PES
886 packet will have its b_data_lost flag set */
887 intf_DbgMsg("Corrupted PES packet received: trashed\n");
888 input_NetlistFreePES( p_input, p_pes );
894 /* The PES packet is valid. Check its type to test if it may
895 carry additional informations in a header extension */
896 p_pes->i_stream_id = p_pes->p_pes_header[3];
898 switch( p_pes->i_stream_id )
900 case 0xBE: /* Padding */
901 case 0xBC: /* Program stream map */
902 case 0xBF: /* Private stream 2 */
905 case 0xFF: /* Program stream directory */
906 case 0xF2: /* DSMCC stream */
907 case 0xF8: /* ITU-T H.222.1 type E stream */
908 /* The payload begins immediatly after the 6 bytes header, so
909 we have finished with the parsing */
910 i_pes_header_size = 6;
914 /* The PES header contains at least 3 more bytes: parse them */
915 p_pes->b_data_alignment = p_pes->p_pes_header[6] & 0x04;
916 p_pes->b_has_pts = p_pes->p_pes_header[7] & 0x80;
917 i_pes_header_size = 9 + p_pes->p_pes_header[8];
919 /* Now parse the optional header extensions (in the limit of
921 if( p_pes->b_has_pts )
923 pcr_descriptor_t * p_pcr;
925 p_pcr = p_input->p_pcr;
928 ( ((mtime_t)(p_pes->p_pes_header[9] & 0x0E) << 29) |
929 (((mtime_t)U16_AT(p_pes->p_pes_header + 10) << 14) - (1 << 14)) |
930 ((mtime_t)U16_AT(p_pes->p_pes_header + 12) >> 1) ) * 300;
933 if( p_pcr->i_synchro_state )
935 switch( p_pcr->i_synchro_state )
937 case SYNCHRO_NOT_STARTED:
938 p_pes->b_has_pts = 0;
942 p_pes->i_pts += p_pcr->delta_pcr;
943 p_pcr->delta_absolute = mdate() - p_pes->i_pts + 500000;
944 p_pes->i_pts += p_pcr->delta_absolute;
945 p_pcr->i_synchro_state = 0;
948 case SYNCHRO_REINIT: /* We skip a PES */
949 p_pes->b_has_pts = 0;
950 p_pcr->i_synchro_state = SYNCHRO_START;
956 p_pes->i_pts += p_pcr->delta_pcr + p_pcr->delta_absolute;
962 /* Now we've parsed the header, we just have to indicate in some
963 specific TS packets where the PES payload begins (renumber
964 i_payload_start), so that the decoders can find the beginning
965 of their data right out of the box. */
966 p_ts = p_pes->p_first_ts;
967 i_ts_payload_size = p_ts->i_payload_end - p_ts->i_payload_start;
968 while( i_pes_header_size > i_ts_payload_size )
970 /* These packets are entirely filled by the PES header. */
971 i_pes_header_size -= i_ts_payload_size;
972 p_ts->i_payload_start = p_ts->i_payload_end;
973 /* Go to the next TS packet: here we won't have to test it is
974 not NULL because we trash the PES packets when packet lost
976 p_ts = p_ts->p_next_ts;
977 i_ts_payload_size = p_ts->i_payload_end - p_ts->i_payload_start;
979 /* This last packet is partly header, partly payload. */
980 p_ts->i_payload_start += i_pes_header_size;
982 /* Now we can eventually put the PES packet in the decoder's
984 switch( p_es_descriptor->i_type )
988 p_fifo = &(((vdec_thread_t*)(p_es_descriptor->p_dec))->fifo);
993 p_fifo = &(((adec_thread_t*)(p_es_descriptor->p_dec))->fifo);
997 p_fifo = &(((ac3dec_thread_t *)(p_es_descriptor->p_dec))->fifo);
1001 /* This should never happen */
1002 intf_DbgMsg("Unknown stream type (%d, %d): PES trashed\n",
1003 p_es_descriptor->i_id, p_es_descriptor->i_type);
1008 if( p_fifo != NULL )
1010 vlc_mutex_lock( &p_fifo->data_lock );
1011 if( DECODER_FIFO_ISFULL( *p_fifo ) )
1013 /* The FIFO is full !!! This should not happen. */
1015 p_input->c_ts_packets_trashed += p_pes->i_ts_packets;
1016 p_es_descriptor->c_invalid_packets += p_pes->i_ts_packets;
1018 input_NetlistFreePES( p_input, p_pes );
1019 intf_DbgMsg("PES trashed - fifo full ! (%d, %d)\n",
1020 p_es_descriptor->i_id, p_es_descriptor->i_type);
1024 // intf_DbgMsg("Putting %p into fifo %p/%d\n",
1025 // p_pes, p_fifo, p_fifo->i_end);
1026 p_fifo->buffer[p_fifo->i_end] = p_pes;
1027 DECODER_FIFO_INCEND( *p_fifo );
1029 /* Warn the decoder that it's got work to do. */
1030 vlc_cond_signal( &p_fifo->data_wait );
1032 vlc_mutex_unlock( &p_fifo->data_lock );
1036 intf_DbgMsg("No fifo to receive PES %p: trash\n", p_pes);
1038 p_input->c_ts_packets_trashed += p_pes->i_ts_packets;
1039 p_es_descriptor->c_invalid_packets += p_pes->i_ts_packets;
1041 input_NetlistFreePES( p_input, p_pes );
1047 /* If we are at the beginning of a new PES packet, we must fetch a new
1048 PES buffer to begin with the reassembly of this PES packet. This is
1049 also here that we can synchronise with the stream if we we lost
1050 packets or if the decoder has just started */
1055 /* Get a new one PES from the PES netlist. */
1056 if( (p_pes = input_NetlistGetPES( p_input )) == (NULL) )
1058 /* PES netlist is empty ! */
1059 p_input->b_error = 1;
1063 // intf_DbgMsg("New PES packet %p (first TS: %p)\n", p_pes, p_ts_packet);
1065 /* Init the PES fields so that the first TS packet could be correctly
1066 added to the PES packet (see below) */
1067 p_pes->p_first_ts = p_ts_packet;
1068 p_pes->p_last_ts = NULL;
1070 /* If the last pes packet was null, this means that the synchronisation
1071 was lost and so warn the decoder that he will have to find a way to
1074 p_pes->b_data_loss = 1;
1076 /* Read the b_random_access flag status and then reinit it */
1077 p_pes->b_random_access = p_es_descriptor->b_random;
1078 p_es_descriptor->b_random = 0;
1083 /* If we are synchronised with the stream, and so if we are ready to
1084 receive correctly the data, add the TS packet to the current PES
1088 // intf_DbgMsg("Adding TS %p to PES %p\n", p_ts_packet, p_pes);
1090 /* Size of the payload carried in the TS packet */
1091 i_ts_payload_size = p_ts_packet->i_payload_end -
1092 p_ts_packet->i_payload_start;
1094 /* Update the relations between the TS packets */
1095 p_ts_packet->p_prev_ts = p_pes->p_last_ts;
1096 p_ts_packet->p_next_ts = NULL;
1097 if( p_pes->i_ts_packets != 0 )
1099 /* Regarder si il serait pas plus efficace de ne creer que les liens
1100 precedent->suivant pour le moment, et les liens suivant->precedent
1101 quand le paquet est termine */
1102 /* Otherwise it is the first TS packet. */
1103 p_pes->p_last_ts->p_next_ts = p_ts_packet;
1105 /* Now add the TS to the PES packet */
1106 p_pes->p_last_ts = p_ts_packet;
1107 p_pes->i_ts_packets++;
1108 p_pes->i_pes_size += i_ts_payload_size;
1112 i_dummy = p_ts_packet->i_payload_end - p_ts_packet->i_payload_start;
1113 p_es_descriptor->c_payload_bytes += i_dummy;
1118 /* Since we don't use the TS packet to build a PES packet, we don't
1119 need it anymore, so give it back to the netlist */
1120 // intf_DbgMsg("Trashing TS %p: no PES being build\n", p_ts_packet);
1121 input_NetlistFreeTS( p_input, p_ts_packet );
1130 /*******************************************************************************
1132 *******************************************************************************
1133 * Notice that current ES state has been locked by input_SortPacket. (No more true,
1134 * changed by benny - See if it's ok, and definitely change the code ???????? )
1135 *******************************************************************************/
1136 static __inline__ void input_DemuxPSI( input_thread_t *p_input,
1137 ts_packet_t *p_ts_packet,
1138 es_descriptor_t *p_es_descriptor,
1139 boolean_t b_unit_start, boolean_t b_packet_lost )
1141 int i_data_offset; /* Offset of the interesting data in the TS packet */
1142 u16 i_data_length; /* Length of those data */
1143 //boolean_t b_first_section; /* Was there another section in the TS packet ? */
1146 ASSERT(p_ts_packet);
1147 ASSERT(p_es_descriptor);
1149 #define p_psi (p_es_descriptor->p_psi_section)
1151 // intf_DbgMsg( "input debug: PSI demultiplexing %p (%p)\n", p_ts_packet, p_input);
1153 // 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);
1156 /* Try to find the beginning of the payload in the packet to initialise
1157 the do-while loop that follows -> Compute the i_data_offset variable:
1158 by default, the value is set so that we won't enter in the while loop.
1159 It will be set to a correct value if the data are not corrupted */
1160 i_data_offset = TS_PACKET_SIZE;
1162 /* Has the reassembly of a section already began in a previous packet ? */
1163 if( p_psi->b_running_section )
1165 /* Was data lost since the last TS packet ? */
1168 /* Discard the packet and wait for the begining of a new one to resynch */
1169 p_psi->b_running_section = 0;
1170 p_psi->i_current_position = 0;
1171 intf_DbgMsg( "PSI section(s) discarded due to packet loss\n" );
1175 /* The data that complete a previously began section are always at
1176 the beginning of the TS payload... */
1177 i_data_offset = p_ts_packet->i_payload_start;
1178 /* ...Unless there is a pointer field, that we have to bypass */
1181 // intf_DbgMsg( "New part of the section received at offset %d\n", i_data_offset );
1184 /* We are looking for the beginning of a new section */
1189 /* Get the offset at which the data for that section can be found
1190 The offset is stored in the pointer_field since we are interested in
1191 the first section of the TS packet. Note that the +1 is to bypass
1192 the pointer field */
1193 i_data_offset = p_ts_packet->i_payload_start +
1194 p_ts_packet->buffer[p_ts_packet->i_payload_start] + 1;
1195 // intf_DbgMsg( "New section beginning at offset %d in TS packet\n", i_data_offset );
1199 /* This may either mean that the TS is bad or that the packet contains
1200 the end of a section that had been discarded in a previous loop:
1201 trash the TS packet since we cannot do anything with those data: */
1202 p_psi->b_running_section = 0;
1203 p_psi->i_current_position = 0;
1204 intf_DbgMsg( "PSI packet discarded due to lack of synchronisation\n" );
1208 /* The section we will deal with during the first iteration of the following
1209 loop is the first one contained in the TS packet */
1210 // b_first_section = 1;
1212 /* Reassemble the pieces of sections contained in the TS packet and decode
1213 the sections that could have been completed.
1214 Stop when we reach the end of the packet or stuffing bytes */
1215 while( i_data_offset < TS_PACKET_SIZE && p_ts_packet->buffer[i_data_offset] != 0xFF )
1217 /* If the current section is a new one, reinit the data fields of the p_psi
1218 struct to start its decoding */
1219 if( !p_psi->b_running_section )
1221 /* Read the length of the new section */
1222 p_psi->i_length = (U16_AT(&p_ts_packet->buffer[i_data_offset+1]) & 0xFFF) + 3;
1223 // intf_DbgMsg( "Section length %d\n", p_psi->i_length );
1224 if( p_psi->i_length > PSI_SECTION_SIZE )
1226 /* The TS packet is corrupted, stop here to avoid possible a seg fault */
1227 intf_DbgMsg( "PSI Section size is too big, aborting its reception\n" );
1231 /* Init the reassembly of that section */
1232 p_psi->b_running_section = 1;
1233 p_psi->i_current_position = 0;
1236 /* Compute the length of data related to the section in this TS packet */
1237 if( p_psi->i_length - p_psi->i_current_position > TS_PACKET_SIZE - i_data_offset)
1238 i_data_length = TS_PACKET_SIZE - i_data_offset;
1240 i_data_length = p_psi->i_length - p_psi->i_current_position;
1242 /* Copy those data in the section buffer */
1243 memcpy( &p_psi->buffer[p_psi->i_current_position], &p_ts_packet->buffer[i_data_offset],
1246 /* Interesting data are now after the ones we copied, since no gap is
1247 allowed between 2 sections in a TS packets */
1248 i_data_offset += i_data_length;
1250 /* Decode the packet if it is now complete */
1251 if (p_psi->i_length == p_psi->i_current_position + i_data_length)
1253 /* Packet is complete, decode it */
1254 // intf_DbgMsg( "SECTION COMPLETE: starting decoding of its data\n" );
1255 input_PsiDecode( p_input, p_psi );
1257 /* Prepare the buffer to receive a new section */
1258 p_psi->i_current_position = 0;
1259 p_psi->b_running_section = 0;
1261 /* The new section won't be the first anymore */
1262 //b_first_section = 0;
1266 /* Prepare the buffer to receive the next part of the section */
1267 p_psi->i_current_position += i_data_length;
1268 // intf_DbgMsg( "Section not complete, waiting for the end\n" );
1271 // intf_DbgMsg( "Must loop ? Next data offset: %d, stuffing: %d\n",
1272 // i_data_offset, p_ts_packet->buffer[i_data_offset] );
1275 /* Relase the TS packet, we don't need it anymore */
1276 input_NetlistFreeTS( p_input, p_ts_packet );