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:
116 p_input->p_open = &input_FileCreateMethod;
117 p_input->p_read = &input_FileRead;
118 p_input->p_clean = &input_FileDestroyMethod;
120 p_input->p_open = input_FileCreateMethod;
121 p_input->p_read = input_FileRead;
122 p_input->p_clean = input_FileDestroyMethod;
126 /* Network methods */
127 case INPUT_METHOD_TS_UCAST:
128 case INPUT_METHOD_TS_MCAST:
129 case INPUT_METHOD_TS_BCAST:
130 case INPUT_METHOD_TS_VLAN_BCAST:
132 p_input->p_open = &input_NetworkCreateMethod;
133 p_input->p_read = &input_NetworkRead;
134 p_input->p_clean = &input_NetworkDestroyMethod;
136 p_input->p_open = input_NetworkCreateMethod;
137 p_input->p_read = input_NetworkRead;
138 p_input->p_clean = input_NetworkDestroyMethod;
142 case INPUT_METHOD_NONE:
145 /* Internal error, which should never happen */
146 intf_DbgMsg("input debug: unknow method type %d\n",
153 /* Initialize PSI decoder. */
154 intf_DbgMsg("Initializing PSI decoder\n");
155 if( input_PsiInit( p_input ) == -1 )
161 /* Initialize PCR decoder. */
162 intf_DbgMsg("Initializing PCR decoder\n");
163 if( input_PcrInit( p_input ) == -1 )
165 input_PsiClean( p_input );
170 /* Initialize netlists. */
171 if( input_NetlistOpen( p_input ) )
173 input_PsiClean( p_input );
174 input_PcrClean( p_input );
180 /* Initialize counters. */
181 p_input->c_bytes = 0;
182 p_input->c_payload_bytes = 0;
183 p_input->c_ts_packets_read = 0;
184 p_input->c_ts_packets_trashed = 0;
186 p_input->c_loops = 0;
190 /* Let the appropriate method open the socket. */
191 if( (*(p_input->p_open))( p_input, p_cfg ) == -1 )
193 input_NetlistClean( p_input );
194 input_PsiClean( p_input );
195 input_PcrClean( p_input );
200 intf_DbgMsg("input debug: method %d properly initialized the socket\n",
203 /* Create thread and set locks. */
205 vlc_mutex_init( &p_input->netlist.lock );
206 vlc_mutex_init( &p_input->programs_lock );
207 vlc_mutex_init( &p_input->es_lock );
209 input_Thread( p_input );
211 if( vlc_thread_create(&p_input->thread_id, "input", (vlc_thread_func_t)input_Thread,
214 intf_ErrMsg("input error: can't spawn input thread (%s)\n",
216 (*p_input->p_clean)( p_input );
217 input_NetlistClean( p_input );;
218 input_PsiClean( p_input );
219 input_PcrClean( p_input );
225 /* Default setting for new decoders */
226 p_input->p_aout = p_cfg->p_aout;
231 /******************************************************************************
232 * input_DestroyThread: mark an input thread as zombie
233 ******************************************************************************
234 * This function should not return until the thread is effectively cancelled.
235 ******************************************************************************/
236 void input_DestroyThread( input_thread_t *p_input )
238 intf_DbgMsg("input debug: requesting termination of input thread\n");
239 p_input->b_die = 1; /* ask thread to kill itself */
241 /* Remove this as soon as the "status" flag is implemented */
242 vlc_thread_join( p_input->thread_id ); /* wait until it's done */
246 /*******************************************************************************
247 * input_OpenAudioStream: open an audio stream
248 *******************************************************************************
249 * This function spawns an audio decoder and plugs it on the audio output
251 *******************************************************************************/
252 int input_OpenAudioStream( input_thread_t *p_input, int i_id )
257 /*******************************************************************************
258 * input_CloseAudioStream: close an audio stream
259 *******************************************************************************
260 * This function destroys an audio decoder.
261 *******************************************************************************/
262 void input_CloseAudioStream( input_thread_t *p_input, int i_id )
267 /*******************************************************************************
268 * input_OpenVideoStream: open a video stream
269 *******************************************************************************
270 * This function spawns a video decoder and plugs it on a video output thread.
271 *******************************************************************************/
272 int input_OpenVideoStream( input_thread_t *p_input,
273 struct vout_thread_s *p_vout, struct video_cfg_s * p_cfg )
278 /*******************************************************************************
279 * input_CloseVideoStream: close a video stream
280 *******************************************************************************
281 * This function destroys an video decoder.
282 *******************************************************************************/
283 void input_CloseVideoStream( input_thread_t *p_input, int i_id )
289 /* following functions are local */
291 /*******************************************************************************
292 * input_Thread: input thread
293 *******************************************************************************
294 * Thread in charge of processing the network packets and demultiplexing.
295 *******************************************************************************/
296 static void input_Thread( input_thread_t *p_input )
298 intf_DbgMsg("input debug 11-1: thread %p is active\n", p_input);
299 while( !p_input->b_die && !p_input->b_error )
301 /* Scatter read the UDP packet from the network or the file. */
302 if( (input_ReadPacket( p_input )) == (-1) )
304 /* ??? Normally, a thread can't kill itself, but we don't have
305 * any method in case of an error condition ... */
306 p_input->b_error = 1;
314 if( p_input->b_error )
316 ErrorThread( p_input );
319 /* Ohoh, we have to die as soon as possible. */
320 EndThread( p_input );
322 intf_DbgMsg("input debug: thread %p destroyed\n", p_input);
327 /******************************************************************************
328 * ErrorThread: RunThread() error loop
329 ******************************************************************************/
330 static void ErrorThread( input_thread_t *p_input )
332 while( !p_input->b_die )
334 msleep( INPUT_IDLE_SLEEP );
338 /*******************************************************************************
339 * EndThread: end the input thread
340 *******************************************************************************/
341 static void EndThread( input_thread_t * p_input )
345 (*p_input->p_clean)( p_input ); /* close input method */
347 /* Destroy all decoder threads. */
348 for( i_es_loop = 0; i_es_loop < INPUT_MAX_ES; i_es_loop++ )
350 if( p_input->pp_selected_es[i_es_loop] )
352 switch( p_input->pp_selected_es[i_es_loop]->i_type )
357 vdec_DestroyThread( (vdec_thread_t*)(p_input->pp_selected_es[i_es_loop]->p_dec) /*, NULL */ );
359 vpar_DestroyThread( (vpar_thread_t*)(p_input->pp_selected_es[i_es_loop]->p_dec) /*, NULL */ );
365 adec_DestroyThread( (adec_thread_t*)(p_input->pp_selected_es[i_es_loop]->p_dec) );
369 ac3dec_DestroyThread( (ac3dec_thread_t *)(p_input->pp_selected_es[i_es_loop]->p_dec) );
378 /* pp_selected_es should not contain any hole. */
383 input_NetlistClean( p_input ); /* clean netlist */
384 input_PsiClean( p_input ); /* clean PSI information */
385 input_PcrClean( p_input ); /* clean PCR information */
386 free( p_input ); /* free input_thread structure */
388 intf_DbgMsg("input debug: EndThread(%p)\n", p_input);
391 /*******************************************************************************
392 * input_ReadPacket: reads a packet from the network or the file
393 *******************************************************************************/
394 static __inline__ int input_ReadPacket( input_thread_t *p_input )
396 int i_base_index; /* index of the first free iovec */
399 #ifdef INPUT_LIFO_TS_NETLIST
400 int i_meanwhile_released;
401 int i_currently_removed;
403 ts_packet_t * p_ts_packet;
405 /* In this function, we only care about the TS netlist. PES netlist
406 * is for the demultiplexer. */
407 #ifdef INPUT_LIFO_TS_NETLIST
408 i_base_index = p_input->netlist.i_ts_index;
410 /* Verify that we still have packets in the TS netlist */
411 if( (INPUT_MAX_TS + INPUT_TS_READ_ONCE - 1 - p_input->netlist.i_ts_index) <= INPUT_TS_READ_ONCE )
413 intf_ErrMsg("input error: TS netlist is empty !\n");
417 #else /* FIFO netlist */
418 i_base_index = p_input->netlist.i_ts_start;
419 if( p_input->netlist.i_ts_start + INPUT_TS_READ_ONCE -1 > INPUT_MAX_TS )
421 /* The netlist is splitted in 2 parts. We must gather them to consolidate
422 the FIFO (we make the loop easily in having the same iovec at the far
423 end and in the beginning of netlist_free).
424 That's why the netlist is (INPUT_MAX_TS +1) + (INPUT_TS_READ_ONCE -1)
426 memcpy( p_input->netlist.p_ts_free + INPUT_MAX_TS + 1,
427 p_input->netlist.p_ts_free,
428 (p_input->netlist.i_ts_start + INPUT_TS_READ_ONCE - 1 - INPUT_MAX_TS)
429 * sizeof(struct iovec) );
432 /* Verify that we still have packets in the TS netlist */
433 if( ((p_input->netlist.i_ts_end -1 - p_input->netlist.i_ts_start) & INPUT_MAX_TS) <= INPUT_TS_READ_ONCE )
435 intf_ErrMsg("input error: TS netlist is empty !\n");
438 #endif /* FIFO netlist */
440 /* Scatter read the buffer. */
441 i_packet_size = (*p_input->p_read)( p_input,
442 &p_input->netlist.p_ts_free[i_base_index],
443 INPUT_TS_READ_ONCE );
444 if( i_packet_size == (-1) )
446 // intf_DbgMsg("Read packet %d %p %d %d\n", i_base_index,
447 // &p_input->netlist.p_ts_free[i_base_index],
448 // p_input->netlist.i_ts_start,
449 // p_input->netlist.i_ts_end);
450 intf_ErrMsg("input error: readv() failed (%s)\n", strerror(errno));
454 if( i_packet_size == 0 )
456 /* No packet has been received, so stop here. */
460 /* Demultiplex the TS packets (1..INPUT_TS_READ_ONCE) received. */
461 for( i_current_index = i_base_index;
462 (i_packet_size -= TS_PACKET_SIZE) >= 0;
465 /* BTW, something REALLY bad could happen if we receive packets with
467 p_ts_packet = (ts_packet_t*)(p_input->netlist.p_ts_free[i_current_index].iov_base);
468 /* Don't cry :-), we are allowed to do that cast, because initially,
469 our buffer was malloc'ed with sizeof(ts_packet_t) */
471 /* Find out if we need this packet and demultiplex. */
472 input_SortPacket( p_input /* for current PIDs and netlist */,
476 if( i_packet_size > 0 )
478 intf_ErrMsg("input error: wrong size\n");
482 /* Remove the TS packets we have just filled from the netlist */
483 #ifdef INPUT_LIFO_TS_NETLIST
484 /* We need to take a lock here while we're calculating index positions. */
485 vlc_mutex_lock( &p_input->netlist.lock );
487 i_meanwhile_released = i_base_index - p_input->netlist.i_ts_index;
488 if( i_meanwhile_released )
490 /* That's where it becomes funny :-). Since we didn't take locks for
491 efficiency reasons, other threads (including ourselves, with
492 input_DemuxPacket) might have released packets to the netlist.
493 So we have to copy these iovec where they should go.
495 BTW, that explains why the TS netlist is
496 (INPUT_MAX_TS +1) + (TS_READ_ONCE -1) large. */
498 i_currently_removed = i_current_index - i_base_index;
499 if( i_meanwhile_released < i_currently_removed )
501 /* Copy all iovecs in that case */
502 memcpy( &p_input->netlist.p_ts_free[p_input->netlist.i_ts_index]
503 + i_currently_removed,
504 &p_input->netlist.p_ts_free[p_input->netlist.i_ts_index],
505 i_meanwhile_released * sizeof(struct iovec) );
509 /* We have fewer places than items, so we only move
510 i_currently_removed of them. */
511 memcpy( &p_input->netlist.p_ts_free[i_base_index],
512 &p_input->netlist.p_ts_free[p_input->netlist.i_ts_index],
513 i_currently_removed * sizeof(struct iovec) );
516 /* Update i_netlist_index with the information gathered above. */
517 p_input->netlist.i_ts_index += i_currently_removed;
521 /* Nothing happened. */
522 p_input->netlist.i_ts_index = i_current_index;
525 vlc_mutex_unlock( &p_input->netlist.lock );
527 #else /* FIFO netlist */
528 /* & is modulo ; that's where we make the loop. */
529 p_input->netlist.i_ts_start = i_current_index & INPUT_MAX_TS;
533 p_input->c_ts_packets_read += i_current_index - i_base_index;
534 p_input->c_bytes += (i_current_index - i_base_index) * TS_PACKET_SIZE;
539 /*******************************************************************************
540 * input_SortPacket: find out whether we need that packet
541 *******************************************************************************/
542 static __inline__ void input_SortPacket( input_thread_t *p_input,
543 ts_packet_t *p_ts_packet )
548 /* Verify that sync_byte, error_indicator and scrambling_control are
550 if( !(p_ts_packet->buffer[0] == 0x47) || (p_ts_packet->buffer[1] & 0x80) ||
551 (p_ts_packet->buffer[3] & 0xc0) )
553 intf_DbgMsg("input debug: invalid TS header (%p)\n", p_ts_packet);
557 /* Get the PID of the packet. Note that ntohs is needed, for endianness
558 purposes (see man page). */
559 i_current_pid = U16_AT(&p_ts_packet->buffer[1]) & 0x1fff;
561 // intf_DbgMsg("input debug: pid %d received (%p)\n",
562 // i_current_pid, p_ts_packet);
564 /* Lock current ES state. */
565 vlc_mutex_lock( &p_input->es_lock );
567 /* Verify that we actually want this PID. */
568 for( i_es_loop = 0; i_es_loop < INPUT_MAX_SELECTED_ES; i_es_loop++ )
570 if( p_input->pp_selected_es[i_es_loop] != NULL)
572 if( (*p_input->pp_selected_es[i_es_loop]).i_id
575 /* Don't need the lock anymore, since the value pointed
576 out by p_input->pp_selected_es[i_es_loop] can only be
577 modified from inside the input_thread (by the PSI
578 decoder): interface thread is only allowed to modify
579 the pp_selected_es table */
580 vlc_mutex_unlock( &p_input->es_lock );
582 /* We're interested. Pass it to the demultiplexer. */
583 input_DemuxTS( p_input, p_ts_packet,
584 p_input->pp_selected_es[i_es_loop] );
590 /* pp_selected_es should not contain any hole. */
594 vlc_mutex_unlock( &p_input->es_lock );
597 /* We weren't interested in receiving this packet. Give it back to the
599 // intf_DbgMsg("SortPacket: freeing unwanted TS %p (pid %d)\n", p_ts_packet,
600 // U16_AT(&p_ts_packet->buffer[1]) & 0x1fff);
601 input_NetlistFreeTS( p_input, p_ts_packet );
603 p_input->c_ts_packets_trashed++;
607 /*******************************************************************************
608 * input_DemuxTS: first step of demultiplexing: the TS header
609 *******************************************************************************
610 * Stream must also only contain PES and PSI, so PID must have been filtered
611 *******************************************************************************/
612 static __inline__ void input_DemuxTS( input_thread_t *p_input,
613 ts_packet_t *p_ts_packet,
614 es_descriptor_t *p_es_descriptor )
617 boolean_t b_adaption; /* Adaption field is present */
618 boolean_t b_payload; /* Packet carries payload */
619 boolean_t b_unit_start; /* A PSI or a PES start in the packet */
620 boolean_t b_trash = 0; /* Must the packet be trashed ? */
621 boolean_t b_lost = 0; /* Was there a packet lost ? */
625 ASSERT(p_es_descriptor);
627 #define p (p_ts_packet->buffer)
629 // intf_DbgMsg("input debug: TS-demultiplexing packet %p, pid %d, number %d\n",
630 // p_ts_packet, U16_AT(&p[1]) & 0x1fff, p[3] & 0x0f);
633 p_es_descriptor->c_packets++;
634 p_es_descriptor->c_bytes += TS_PACKET_SIZE;
637 /* Extract flags values from TS common header. */
638 b_unit_start = (p[1] & 0x40);
639 b_adaption = (p[3] & 0x20);
640 b_payload = (p[3] & 0x10);
642 /* Extract adaption field informations if any */
645 /* We don't have any adaptation_field, so payload start immediately
646 after the 4 byte TS header */
647 p_ts_packet->i_payload_start = 4;
651 /* p[4] is adaptation_field_length minus one */
652 p_ts_packet->i_payload_start = 5 + p[4];
654 /* The adaption field can be limited to the adaptation_field_length byte,
655 so that there is nothing to do: skip this possibility */
658 /* If the packet has both adaptation_field and payload, adaptation_field
659 cannot be more than 182 bytes long; if there is only an
660 adaptation_field, it must fill the next 183 bytes. */
661 if( b_payload ? (p[4] > 182) : (p[4] != 183) )
663 intf_DbgMsg("input debug: invalid TS adaptation field (%p)\n",
666 p_es_descriptor->c_invalid_packets++;
671 /* No we are sure that the byte containing flags is present: read it */
674 /* discontinuity_indicator */
677 intf_DbgMsg("discontinuity_indicator encountered by TS demux " \
678 "(position read: %d, saved: %d)\n", p[5] & 0x80,
679 p_es_descriptor->i_continuity_counter);
681 /* If the PID carries the PCR, there will be a system time-base
682 discontinuity. We let the PCR decoder handle that. */
683 p_es_descriptor->b_discontinuity = 1;
685 /* There also may be a continuity_counter discontinuity:
686 resynchronise our counter with the one of the stream */
687 p_es_descriptor->i_continuity_counter = (p[3] & 0x0f) - 1;
690 /* random_access_indicator */
691 p_es_descriptor->b_random |= p[5] & 0x40;
693 /* If this is a PCR_PID, and this TS packet contains a PCR,
694 we pass it along to the PCR decoder. */
695 if( (p_es_descriptor->b_pcr) && (p[5] & 0x10) )
697 /* There should be a PCR field in the packet, check if the
698 adaption field is long enough to carry it */
701 /* Call the PCR decoder */
702 input_PcrDecode( p_input, p_es_descriptor, &p[6] );
709 /* Check the continuity of the stream. */
710 i_dummy = ((p[3] & 0x0f) - p_es_descriptor->i_continuity_counter) & 0x0f;
713 /* Everything is ok, just increase our counter */
714 p_es_descriptor->i_continuity_counter++;
718 if( !b_payload && i_dummy == 0 )
720 /* This is a packet without payload, this is allowed by the draft
721 As there is nothing interessant in this packet (except PCR that
722 have already been handled), we can trash the packet. */
723 intf_DbgMsg("Packet without payload received by TS demux\n");
726 else if( i_dummy <= 0 )
728 /* Duplicate packet: mark it as being to be trashed. */
729 intf_DbgMsg("Duplicate packet received by TS demux\n");
732 else if( p_es_descriptor->i_continuity_counter == 0xFF )
734 /* This means that the packet is the first one we receive for this
735 ES since the continuity counter ranges between 0 and 0x0F
736 excepts when it has been initialized by the input: Init the
737 counter to the correct value. */
738 intf_DbgMsg("First packet for PID %d received by TS demux\n",
739 p_es_descriptor->i_id);
740 p_es_descriptor->i_continuity_counter = (p[3] & 0x0f);
744 /* This can indicate that we missed a packet or that the
745 continuity_counter wrapped and we received a dup packet: as we
746 don't know, do as if we missed a packet to be sure to recover
747 from this situation */
748 intf_DbgMsg("Packet lost by TS demux: current %d, packet %d\n",
749 p_es_descriptor->i_continuity_counter & 0x0f,
752 p_es_descriptor->i_continuity_counter = p[3] & 0x0f;
756 /* Trash the packet if it has no payload or if it is bad */
759 input_NetlistFreeTS( p_input, p_ts_packet );
761 p_input->c_ts_packets_trashed++;
766 if( p_es_descriptor->b_psi )
768 /* The payload contains PSI tables */
769 input_DemuxPSI( p_input, p_ts_packet, p_es_descriptor,
770 b_unit_start, b_lost );
774 /* The payload carries a PES stream */
775 input_DemuxPES( p_input, p_ts_packet, p_es_descriptor,
776 b_unit_start, b_lost );
786 /*******************************************************************************
788 *******************************************************************************
789 * Gather a PES packet and analyzes its header.
790 *******************************************************************************/
791 static __inline__ void input_DemuxPES( input_thread_t *p_input,
792 ts_packet_t *p_ts_packet,
793 es_descriptor_t *p_es_descriptor,
794 boolean_t b_unit_start,
795 boolean_t b_packet_lost )
797 decoder_fifo_t * p_fifo;
798 u8 i_pes_header_size;
800 pes_packet_t* p_last_pes;
802 int i_ts_payload_size;
805 #define p_pes (p_es_descriptor->p_pes_packet)
809 ASSERT(p_es_descriptor);
811 // intf_DbgMsg("PES-demultiplexing %p (%p)\n", p_ts_packet, p_pes);
813 /* If we lost data, discard the PES packet we are trying to reassemble
814 if any and wait for the beginning of a new one in order to synchronise
816 if( b_packet_lost && p_pes != NULL )
818 intf_DbgMsg("PES %p trashed because of packet lost\n", p_pes);
819 input_NetlistFreePES( p_input, p_pes );
823 /* If the TS packet contains the begining of a new PES packet, and if we
824 were reassembling a PES packet, then the PES should be complete now,
825 so parse its header and give it to the decoders */
826 if( b_unit_start && p_pes != NULL )
828 // intf_DbgMsg("End of PES packet %p\n", p_pes);
830 /* Parse the header. The header has a variable length, but in order
831 to improve the algorithm, we will read the 14 bytes we may be
833 p_ts = p_pes->p_first_ts;
834 i_ts_payload_size = p_ts->i_payload_end - p_ts->i_payload_start;
837 if(i_ts_payload_size >= PES_HEADER_SIZE)
839 /* This part of the header entirely fits in the payload of
840 the first TS packet */
841 p_pes->p_pes_header = &(p_ts->buffer[p_ts->i_payload_start]);
845 /* This part of the header does not fit in the current TS packet:
846 copy the part of the header we are interested in to the
847 p_pes_header_save buffer. The buffer is dynamicly allocated if
848 needed so it's time expensive but this situation almost never
850 intf_DbgMsg("Code never tested encountered, WARNING ! (benny)\n");
851 if( !p_pes->p_pes_header_save )
852 p_pes->p_pes_header_save = malloc(PES_HEADER_SIZE);
856 memcpy(p_pes->p_pes_header_save + i_dummy,
857 &p_ts->buffer[p_ts->i_payload_start], i_ts_payload_size);
858 i_dummy += i_ts_payload_size;
860 p_ts = p_ts->p_next_ts;
863 /* The payload of the PES packet is shorter than the 14 bytes
864 we would read. This means that high packet lost occured
865 so the PES won't be usefull for any decoder. Moreover,
866 this should never happen so we can trash the packet and
867 exit roughly without regrets */
868 intf_DbgMsg("PES packet too short: trashed\n");
869 input_NetlistFreePES( p_input, p_pes );
875 i_ts_payload_size = p_ts->i_payload_end - p_ts->i_payload_start;
877 while(i_ts_payload_size + i_dummy < PES_HEADER_SIZE);
879 /* This last TS packet is partly header, partly payload, so just
880 copy the header part */
881 memcpy(p_pes->p_pes_header_save + i_dummy,
882 &p_ts->buffer[p_ts->i_payload_start],
883 PES_HEADER_SIZE - i_dummy);
885 /* The header must be read in the buffer not in any TS packet */
886 p_pes->p_pes_header = p_pes->p_pes_header_save;
889 /* Now we have the part of the PES header we were interested in:
892 /* First read the 6 header bytes common to all PES packets:
893 use them to test the PES validity */
894 if( (p_pes->p_pes_header[0] || p_pes->p_pes_header[1] ||
895 (p_pes->p_pes_header[2] != 1)) ||
896 /* packet_start_code_prefix != 0x000001 */
897 ((i_dummy = U16_AT(p_pes->p_pes_header + 4)) &&
898 (i_dummy + 6 != p_pes->i_pes_size)) )
899 /* PES_packet_length is set and != total received payload */
901 /* Trash the packet and set p_pes to NULL to be sure the next PES
902 packet will have its b_data_lost flag set */
903 intf_DbgMsg("Corrupted PES packet received: trashed\n");
904 input_NetlistFreePES( p_input, p_pes );
910 /* The PES packet is valid. Check its type to test if it may
911 carry additional informations in a header extension */
912 p_pes->i_stream_id = p_pes->p_pes_header[3];
914 switch( p_pes->i_stream_id )
916 case 0xBE: /* Padding */
917 case 0xBC: /* Program stream map */
918 case 0xBF: /* Private stream 2 */
921 case 0xFF: /* Program stream directory */
922 case 0xF2: /* DSMCC stream */
923 case 0xF8: /* ITU-T H.222.1 type E stream */
924 /* The payload begins immediatly after the 6 bytes header, so
925 we have finished with the parsing */
926 i_pes_header_size = 6;
930 /* The PES header contains at least 3 more bytes: parse them */
931 p_pes->b_data_alignment = p_pes->p_pes_header[6] & 0x04;
932 p_pes->b_has_pts = p_pes->p_pes_header[7] & 0x80;
933 i_pes_header_size = p_pes->p_pes_header[8] + 9;
935 /* Now parse the optional header extensions (in the limit of
937 if( p_pes->b_has_pts )
939 pcr_descriptor_t * p_pcr;
941 p_pcr = p_input->p_pcr;
944 ( ((mtime_t)(p_pes->p_pes_header[9] & 0x0E) << 29) |
945 (((mtime_t)U16_AT(p_pes->p_pes_header + 10) << 14) - (1 << 14)) |
946 ((mtime_t)U16_AT(p_pes->p_pes_header + 12) >> 1) ) * 300;
949 if( p_pcr->i_synchro_state )
951 switch( p_pcr->i_synchro_state )
953 case SYNCHRO_NOT_STARTED:
954 p_pes->b_has_pts = 0;
958 p_pes->i_pts += p_pcr->delta_pcr;
959 p_pcr->delta_absolute = mdate() - p_pes->i_pts + 500000;
960 p_pes->i_pts += p_pcr->delta_absolute;
961 p_pcr->i_synchro_state = 0;
964 case SYNCHRO_REINIT: /* We skip a PES */
965 p_pes->b_has_pts = 0;
966 p_pcr->i_synchro_state = SYNCHRO_START;
972 p_pes->i_pts += p_pcr->delta_pcr + p_pcr->delta_absolute;
978 /* Now we've parsed the header, we just have to indicate in some
979 specific TS packets where the PES payload begins (renumber
980 i_payload_start), so that the decoders can find the beginning
981 of their data right out of the box. */
982 p_ts = p_pes->p_first_ts;
983 i_ts_payload_size = p_ts->i_payload_end - p_ts->i_payload_start;
984 while( i_pes_header_size > i_ts_payload_size )
986 /* These packets are entirely filled by the PES header. */
987 i_pes_header_size -= i_ts_payload_size;
988 p_ts->i_payload_start = p_ts->i_payload_end;
989 /* Go to the next TS packet: here we won't have to test it is
990 not NULL because we trash the PES packets when packet lost
992 p_ts = p_ts->p_next_ts;
993 i_ts_payload_size = p_ts->i_payload_end - p_ts->i_payload_start;
995 /* This last packet is partly header, partly payload. */
996 p_ts->i_payload_start += i_pes_header_size;
999 /* Now we can eventually put the PES packet in the decoder's
1001 switch( p_es_descriptor->i_type )
1003 case MPEG1_VIDEO_ES:
1004 case MPEG2_VIDEO_ES:
1006 p_fifo = &(((vdec_thread_t*)(p_es_descriptor->p_dec))->fifo);
1008 p_fifo = &(((vpar_thread_t*)(p_es_descriptor->p_dec))->fifo);
1012 case MPEG1_AUDIO_ES:
1013 case MPEG2_AUDIO_ES:
1014 p_fifo = &(((adec_thread_t*)(p_es_descriptor->p_dec))->fifo);
1018 /* we skip 4 bytes at the beginning of the AC3 payload */
1019 p_ts->i_payload_start += 4;
1020 p_fifo = &(((ac3dec_thread_t *)(p_es_descriptor->p_dec))->fifo);
1024 /* This should never happen */
1025 intf_DbgMsg("Unknown stream type (%d, %d): PES trashed\n",
1026 p_es_descriptor->i_id, p_es_descriptor->i_type);
1031 if( p_fifo != NULL )
1033 vlc_mutex_lock( &p_fifo->data_lock );
1034 if( DECODER_FIFO_ISFULL( *p_fifo ) )
1036 /* The FIFO is full !!! This should not happen. */
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 );
1042 intf_DbgMsg("PES trashed - fifo full ! (%d, %d)\n",
1043 p_es_descriptor->i_id, p_es_descriptor->i_type);
1047 // intf_DbgMsg("Putting %p into fifo %p/%d\n",
1048 // p_pes, p_fifo, p_fifo->i_end);
1049 p_fifo->buffer[p_fifo->i_end] = p_pes;
1050 DECODER_FIFO_INCEND( *p_fifo );
1052 /* Warn the decoder that it's got work to do. */
1053 vlc_cond_signal( &p_fifo->data_wait );
1055 vlc_mutex_unlock( &p_fifo->data_lock );
1059 intf_DbgMsg("No fifo to receive PES %p: trash\n", p_pes);
1061 p_input->c_ts_packets_trashed += p_pes->i_ts_packets;
1062 p_es_descriptor->c_invalid_packets += p_pes->i_ts_packets;
1064 input_NetlistFreePES( p_input, p_pes );
1070 /* If we are at the beginning of a new PES packet, we must fetch a new
1071 PES buffer to begin with the reassembly of this PES packet. This is
1072 also here that we can synchronise with the stream if we we lost
1073 packets or if the decoder has just started */
1078 /* Get a new one PES from the PES netlist. */
1079 if( (p_pes = input_NetlistGetPES( p_input )) == (NULL) )
1081 /* PES netlist is empty ! */
1082 p_input->b_error = 1;
1086 // intf_DbgMsg("New PES packet %p (first TS: %p)\n", p_pes, p_ts_packet);
1088 /* Init the PES fields so that the first TS packet could be correctly
1089 added to the PES packet (see below) */
1090 p_pes->p_first_ts = p_ts_packet;
1091 p_pes->p_last_ts = NULL;
1093 /* If the last pes packet was null, this means that the synchronisation
1094 was lost and so warn the decoder that he will have to find a way to
1097 p_pes->b_data_loss = 1;
1099 /* Read the b_random_access flag status and then reinit it */
1100 p_pes->b_random_access = p_es_descriptor->b_random;
1101 p_es_descriptor->b_random = 0;
1106 /* If we are synchronised with the stream, and so if we are ready to
1107 receive correctly the data, add the TS packet to the current PES
1111 // intf_DbgMsg("Adding TS %p to PES %p\n", p_ts_packet, p_pes);
1113 /* Size of the payload carried in the TS packet */
1114 i_ts_payload_size = p_ts_packet->i_payload_end -
1115 p_ts_packet->i_payload_start;
1117 /* Update the relations between the TS packets */
1118 p_ts_packet->p_prev_ts = p_pes->p_last_ts;
1119 p_ts_packet->p_next_ts = NULL;
1120 if( p_pes->i_ts_packets != 0 )
1122 /* Regarder si il serait pas plus efficace de ne creer que les liens
1123 precedent->suivant pour le moment, et les liens suivant->precedent
1124 quand le paquet est termine */
1125 /* Otherwise it is the first TS packet. */
1126 p_pes->p_last_ts->p_next_ts = p_ts_packet;
1128 /* Now add the TS to the PES packet */
1129 p_pes->p_last_ts = p_ts_packet;
1130 p_pes->i_ts_packets++;
1131 p_pes->i_pes_size += i_ts_payload_size;
1135 i_dummy = p_ts_packet->i_payload_end - p_ts_packet->i_payload_start;
1136 p_es_descriptor->c_payload_bytes += i_dummy;
1141 /* Since we don't use the TS packet to build a PES packet, we don't
1142 need it anymore, so give it back to the netlist */
1143 // intf_DbgMsg("Trashing TS %p: no PES being build\n", p_ts_packet);
1144 input_NetlistFreeTS( p_input, p_ts_packet );
1153 /*******************************************************************************
1155 *******************************************************************************
1156 * Notice that current ES state has been locked by input_SortPacket. (No more true,
1157 * changed by benny - See if it's ok, and definitely change the code ???????? )
1158 *******************************************************************************/
1159 static __inline__ void input_DemuxPSI( input_thread_t *p_input,
1160 ts_packet_t *p_ts_packet,
1161 es_descriptor_t *p_es_descriptor,
1162 boolean_t b_unit_start, boolean_t b_packet_lost )
1164 int i_data_offset; /* Offset of the interesting data in the TS packet */
1165 u16 i_data_length; /* Length of those data */
1166 //boolean_t b_first_section; /* Was there another section in the TS packet ? */
1169 ASSERT(p_ts_packet);
1170 ASSERT(p_es_descriptor);
1172 #define p_psi (p_es_descriptor->p_psi_section)
1174 // intf_DbgMsg( "input debug: PSI demultiplexing %p (%p)\n", p_ts_packet, p_input);
1176 // 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);
1179 /* Try to find the beginning of the payload in the packet to initialise
1180 the do-while loop that follows -> Compute the i_data_offset variable:
1181 by default, the value is set so that we won't enter in the while loop.
1182 It will be set to a correct value if the data are not corrupted */
1183 i_data_offset = TS_PACKET_SIZE;
1185 /* Has the reassembly of a section already began in a previous packet ? */
1186 if( p_psi->b_running_section )
1188 /* Was data lost since the last TS packet ? */
1191 /* Discard the packet and wait for the begining of a new one to resynch */
1192 p_psi->b_running_section = 0;
1193 p_psi->i_current_position = 0;
1194 intf_DbgMsg( "PSI section(s) discarded due to packet loss\n" );
1198 /* The data that complete a previously began section are always at
1199 the beginning of the TS payload... */
1200 i_data_offset = p_ts_packet->i_payload_start;
1201 /* ...Unless there is a pointer field, that we have to bypass */
1204 // intf_DbgMsg( "New part of the section received at offset %d\n", i_data_offset );
1207 /* We are looking for the beginning of a new section */
1212 /* Get the offset at which the data for that section can be found
1213 The offset is stored in the pointer_field since we are interested in
1214 the first section of the TS packet. Note that the +1 is to bypass
1215 the pointer field */
1216 i_data_offset = p_ts_packet->i_payload_start +
1217 p_ts_packet->buffer[p_ts_packet->i_payload_start] + 1;
1218 // intf_DbgMsg( "New section beginning at offset %d in TS packet\n", i_data_offset );
1222 /* This may either mean that the TS is bad or that the packet contains
1223 the end of a section that had been discarded in a previous loop:
1224 trash the TS packet since we cannot do anything with those data: */
1225 p_psi->b_running_section = 0;
1226 p_psi->i_current_position = 0;
1227 intf_DbgMsg( "PSI packet discarded due to lack of synchronisation\n" );
1231 /* The section we will deal with during the first iteration of the following
1232 loop is the first one contained in the TS packet */
1233 // b_first_section = 1;
1235 /* Reassemble the pieces of sections contained in the TS packet and decode
1236 the sections that could have been completed.
1237 Stop when we reach the end of the packet or stuffing bytes */
1238 while( i_data_offset < TS_PACKET_SIZE && p_ts_packet->buffer[i_data_offset] != 0xFF )
1240 /* If the current section is a new one, reinit the data fields of the p_psi
1241 struct to start its decoding */
1242 if( !p_psi->b_running_section )
1244 /* Read the length of the new section */
1245 p_psi->i_length = (U16_AT(&p_ts_packet->buffer[i_data_offset+1]) & 0xFFF) + 3;
1246 // intf_DbgMsg( "Section length %d\n", p_psi->i_length );
1247 if( p_psi->i_length > PSI_SECTION_SIZE )
1249 /* The TS packet is corrupted, stop here to avoid possible a seg fault */
1250 intf_DbgMsg( "PSI Section size is too big, aborting its reception\n" );
1254 /* Init the reassembly of that section */
1255 p_psi->b_running_section = 1;
1256 p_psi->i_current_position = 0;
1259 /* Compute the length of data related to the section in this TS packet */
1260 if( p_psi->i_length - p_psi->i_current_position > TS_PACKET_SIZE - i_data_offset)
1261 i_data_length = TS_PACKET_SIZE - i_data_offset;
1263 i_data_length = p_psi->i_length - p_psi->i_current_position;
1265 /* Copy those data in the section buffer */
1266 memcpy( &p_psi->buffer[p_psi->i_current_position], &p_ts_packet->buffer[i_data_offset],
1269 /* Interesting data are now after the ones we copied, since no gap is
1270 allowed between 2 sections in a TS packets */
1271 i_data_offset += i_data_length;
1273 /* Decode the packet if it is now complete */
1274 if (p_psi->i_length == p_psi->i_current_position + i_data_length)
1276 /* Packet is complete, decode it */
1277 // intf_DbgMsg( "SECTION COMPLETE: starting decoding of its data\n" );
1278 input_PsiDecode( p_input, p_psi );
1280 /* Prepare the buffer to receive a new section */
1281 p_psi->i_current_position = 0;
1282 p_psi->b_running_section = 0;
1284 /* The new section won't be the first anymore */
1285 //b_first_section = 0;
1289 /* Prepare the buffer to receive the next part of the section */
1290 p_psi->i_current_position += i_data_length;
1291 // intf_DbgMsg( "Section not complete, waiting for the end\n" );
1294 // intf_DbgMsg( "Must loop ? Next data offset: %d, stuffing: %d\n",
1295 // i_data_offset, p_ts_packet->buffer[i_data_offset] );
1298 /* Relase the TS packet, we don't need it anymore */
1299 input_NetlistFreeTS( p_input, p_ts_packet );