1 /*****************************************************************************
2 * mpeg_system.c: TS, PS and PES management
3 *****************************************************************************
4 * Copyright (C) 1998, 1999, 2000 VideoLAN
5 * $Id: mpeg_system.c,v 1.56 2001/07/18 15:21:51 massiot Exp $
7 * Authors: Christophe Massiot <massiot@via.ecp.fr>
8 * Michel Lespinasse <walken@via.ecp.fr>
9 * BenoƮt Steiner <benny@via.ecp.fr>
10 * Samuel Hocevar <sam@via.ecp.fr>
11 * Henri Fallon <henri@via.ecp.fr>
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
26 *****************************************************************************/
28 /*****************************************************************************
30 *****************************************************************************/
34 #include <string.h> /* memcpy(), memset() */
35 #include <sys/types.h> /* off_t */
44 #include "stream_control.h"
45 #include "input_ext-intf.h"
46 #include "input_ext-dec.h"
47 #include "input_ext-plugins.h"
49 #include "main.h" /* AC3/MPEG channel, SPU channel */
51 /*****************************************************************************
53 *****************************************************************************/
55 static void input_DecodePAT( input_thread_t *, es_descriptor_t *);
56 static void input_DecodePMT( input_thread_t *, es_descriptor_t *);
59 * PES Packet management
62 /*****************************************************************************
64 *****************************************************************************
65 * Small utility function used to parse discontinuous headers safely. Copies
66 * i_buf_len bytes of data to a buffer and returns the size copied.
67 * It also solves some alignment problems on non-IA-32, non-PPC processors.
68 * This is a variation on the theme of input_ext-dec.h:GetChunk().
69 *****************************************************************************/
70 static __inline__ size_t MoveChunk( byte_t * p_dest,
71 data_packet_t ** pp_data_src,
75 ptrdiff_t i_available;
77 if( (i_available = (*pp_data_src)->p_payload_end - *pp_src)
81 memcpy( p_dest, *pp_src, i_buf_len );
87 size_t i_init_len = i_buf_len;
92 memcpy( p_dest, *pp_src, i_available );
93 *pp_data_src = (*pp_data_src)->p_next;
94 i_buf_len -= i_available;
95 p_dest += i_available;
96 if( *pp_data_src == NULL )
99 return( i_init_len - i_buf_len );
101 *pp_src = (*pp_data_src)->p_payload_start;
103 while( (i_available = (*pp_data_src)->p_payload_end - *pp_src)
109 memcpy( p_dest, *pp_src, i_buf_len );
110 *pp_src += i_buf_len;
112 return( i_init_len );
116 /*****************************************************************************
118 *****************************************************************************
119 * Parse a finished PES packet and analyze its header.
120 *****************************************************************************/
121 #define PES_HEADER_SIZE 7
122 void input_ParsePES( input_thread_t * p_input, es_descriptor_t * p_es )
124 data_packet_t * p_data;
126 byte_t p_header[PES_HEADER_SIZE];
129 #define p_pes (p_es->p_pes)
131 //intf_DbgMsg("End of PES packet %p", p_pes);
133 /* Parse the header. The header has a variable length, but in order
134 * to improve the algorithm, we will read the 14 bytes we may be
136 p_data = p_pes->p_first;
137 p_byte = p_data->p_payload_start;
140 if( MoveChunk( p_header, &p_data, &p_byte, PES_HEADER_SIZE )
143 intf_WarnMsg( 1, "PES packet too short to have a header" );
144 p_input->pf_delete_pes( p_input->p_method_data, p_pes );
149 /* Get the PES size if defined */
150 p_es->i_pes_real_size = U16_AT(p_header + 4);
151 if( p_es->i_pes_real_size )
152 p_es->i_pes_real_size += 6;
154 /* First read the 6 header bytes common to all PES packets:
155 * use them to test the PES validity */
156 if( (p_header[0] || p_header[1] || (p_header[2] != 1)) )
158 /* packet_start_code_prefix != 0x000001 */
159 intf_ErrMsg( "PES packet doesn't start with 0x000001 : data loss" );
160 p_input->pf_delete_pes( p_input->p_method_data, p_pes );
165 int i_pes_header_size, i_payload_size;
167 if ( p_es->i_pes_real_size &&
168 (p_es->i_pes_real_size != p_pes->i_pes_size) )
170 /* PES_packet_length is set and != total received payload */
171 /* Warn the decoder that the data may be corrupt. */
172 intf_WarnMsg( 1, "PES sizes do not match : packet corrupted" );
175 switch( p_es->i_stream_id )
177 case 0xBC: /* Program stream map */
178 case 0xBE: /* Padding */
179 case 0xBF: /* Private stream 2 */
182 case 0xFF: /* Program stream directory */
183 case 0xF2: /* DSMCC stream */
184 case 0xF8: /* ITU-T H.222.1 type E stream */
185 /* The payload begins immediately after the 6 bytes header, so
186 * we have finished with the parsing */
187 i_pes_header_size = 6;
191 if( (p_header[6] & 0xC0) == 0x80 )
193 /* MPEG-2 : the PES header contains at least 3 more bytes. */
195 boolean_t b_has_pts, b_has_dts;
196 byte_t p_full_header[12];
198 p_pes->b_data_alignment = p_header[6] & 0x04;
200 i_max_len = MoveChunk( p_full_header, &p_data, &p_byte, 12 );
204 "PES packet too short to have a MPEG-2 header" );
205 p_input->pf_delete_pes( p_input->p_method_data,
211 b_has_pts = p_full_header[0] & 0x80;
212 b_has_dts = p_full_header[0] & 0x40;
213 i_pes_header_size = p_full_header[1] + 9;
215 /* Now parse the optional header extensions */
221 "PES packet too short to have a MPEG-2 header" );
222 p_input->pf_delete_pes( p_input->p_method_data,
227 p_pes->i_pts = input_ClockGetTS( p_input, p_es->p_pgrm,
228 ( ((mtime_t)(p_full_header[2] & 0x0E) << 29) |
229 ((mtime_t)(p_full_header[3]) << 22) |
230 ((mtime_t)(p_full_header[4] & 0xFE) << 14) |
231 ((mtime_t)p_full_header[5] << 7) |
232 ((mtime_t)p_full_header[6] >> 1) ) );
239 "PES packet too short to have a MPEG-2 header" );
240 p_input->pf_delete_pes( p_input->p_method_data,
245 p_pes->i_dts = input_ClockGetTS( p_input, p_es->p_pgrm,
246 ( ((mtime_t)(p_full_header[7] & 0x0E) << 29) |
247 (((mtime_t)U16_AT(p_full_header + 8) << 14)
249 ((mtime_t)U16_AT(p_full_header + 10) >> 1) ) );
255 /* Probably MPEG-1 */
256 boolean_t b_has_pts, b_has_dts;
258 i_pes_header_size = 6;
259 p_data = p_pes->p_first;
260 p_byte = p_data->p_payload_start;
261 /* Cannot fail because the previous one succeeded. */
262 MoveChunk( NULL, &p_data, &p_byte, 6 );
264 while( *p_byte == 0xFF && i_pes_header_size < 23 )
267 if( MoveChunk( NULL, &p_data, &p_byte, 1 ) != 1 )
270 "PES packet too short to have a MPEG-1 header" );
271 p_input->pf_delete_pes( p_input->p_method_data, p_pes );
276 if( i_pes_header_size == 23 )
278 intf_ErrMsg( "Too much MPEG-1 stuffing" );
279 p_input->pf_delete_pes( p_input->p_method_data, p_pes );
284 if( (*p_byte & 0xC0) == 0x40 )
286 /* Don't ask why... --Meuuh */
287 /* Erm... why ? --Sam */
288 /* Well... According to the recommendation, it is for
289 * STD_buffer_scale and STD_buffer_size. --Meuuh */
290 i_pes_header_size += 2;
291 if( MoveChunk( NULL, &p_data, &p_byte, 2 ) != 2 )
294 "PES packet too short to have a MPEG-1 header" );
295 p_input->pf_delete_pes( p_input->p_method_data, p_pes );
303 b_has_pts = *p_byte & 0x20;
304 b_has_dts = *p_byte & 0x10;
310 i_pes_header_size += 4;
311 if( MoveChunk( p_ts, &p_data, &p_byte, 5 ) != 5 )
314 "PES packet too short to have a MPEG-1 header" );
315 p_input->pf_delete_pes( p_input->p_method_data, p_pes );
320 p_pes->i_pts = input_ClockGetTS( p_input, p_es->p_pgrm,
321 ( ((mtime_t)(p_ts[0] & 0x0E) << 29) |
322 (((mtime_t)U32_AT(p_ts) & 0xFFFE00) << 6) |
323 ((mtime_t)p_ts[3] << 7) |
324 ((mtime_t)p_ts[4] >> 1) ) );
328 i_pes_header_size += 5;
329 if( MoveChunk( p_ts, &p_data, &p_byte, 5 ) != 5 )
332 "PES packet too short to have a MPEG-1 header" );
333 p_input->pf_delete_pes( p_input->p_method_data,
339 p_pes->i_dts = input_ClockGetTS( p_input,
341 ( ((mtime_t)(p_ts[0] & 0x0E) << 29) |
342 (((mtime_t)U32_AT(p_ts) & 0xFFFE00) << 6) |
343 ((mtime_t)p_ts[3] << 7) |
344 ((mtime_t)p_ts[4] >> 1) ) );
352 if( p_es->i_stream_id == 0xbd )
354 /* With private stream 1, the first byte of the payload
355 * is a stream_private_id, so skip it. */
359 /* Now we've parsed the header, we just have to indicate in some
360 * specific data packets where the PES payload begins (renumber
361 * p_payload_start), so that the decoders can find the beginning
362 * of their data right out of the box. */
363 p_data = p_pes->p_first;
364 i_payload_size = p_data->p_payload_end
365 - p_data->p_payload_start;
366 while( i_pes_header_size > i_payload_size )
368 /* These packets are entirely filled by the PES header. */
369 i_pes_header_size -= i_payload_size;
370 p_data->p_payload_start = p_data->p_payload_end;
371 /* Go to the next data packet. */
372 if( (p_data = p_data->p_next) == NULL )
374 intf_ErrMsg( "PES header bigger than payload" );
375 p_input->pf_delete_pes( p_input->p_method_data, p_pes );
379 i_payload_size = p_data->p_payload_end
380 - p_data->p_payload_start;
382 /* This last packet is partly header, partly payload. */
383 if( i_payload_size < i_pes_header_size )
385 intf_ErrMsg( "PES header bigger than payload" );
386 p_input->pf_delete_pes( p_input->p_method_data, p_pes );
390 p_data->p_payload_start += i_pes_header_size;
392 /* Now we can eventually put the PES packet in the decoder's
394 if( p_es->p_decoder_fifo != NULL )
396 input_DecodePES( p_es->p_decoder_fifo, p_pes );
400 intf_ErrMsg("No fifo to receive PES %p (who wrote this damn code ?)",
402 p_input->pf_delete_pes( p_input->p_method_data, p_pes );
410 /*****************************************************************************
412 *****************************************************************************
413 * Gather a PES packet.
414 *****************************************************************************/
415 void input_GatherPES( input_thread_t * p_input, data_packet_t * p_data,
416 es_descriptor_t * p_es,
417 boolean_t b_unit_start, boolean_t b_packet_lost )
419 #define p_pes (p_es->p_pes)
421 //intf_DbgMsg("PES-demultiplexing %p (%p)", p_ts_packet, p_pes);
423 /* If we lost data, insert a NULL data packet (philosophy : 0 is quite
424 * often an escape sequence in decoders, so that should make them wait
425 * for the next start code). */
428 input_NullPacket( p_input, p_es );
431 if( b_unit_start && p_pes != NULL )
433 /* If the data packet contains the begining of a new PES packet, and
434 * if we were reassembling a PES packet, then the PES should be
435 * complete now, so parse its header and give it to the decoders. */
436 input_ParsePES( p_input, p_es );
439 if( !b_unit_start && p_pes == NULL )
441 /* Random access... */
442 p_input->pf_delete_packet( p_input->p_method_data, p_data );
448 /* If we are at the beginning of a new PES packet, we must fetch
449 * a new PES buffer to begin with the reassembly of this PES
450 * packet. This is also here that we can synchronize with the
451 * stream if we lost packets or if the decoder has just
453 if( (p_pes = p_input->pf_new_pes( p_input->p_method_data ) ) == NULL )
455 intf_ErrMsg("Out of memory");
456 p_input->b_error = 1;
459 p_pes->i_rate = p_input->stream.control.i_rate;
460 p_pes->p_first = p_data;
462 /* If the PES header fits in the first data packet, we can
463 * already set p_gather->i_pes_real_size. */
464 if( p_data->p_payload_end - p_data->p_payload_start
467 p_es->i_pes_real_size =
468 U16_AT(p_data->p_payload_start + 4) + 6;
473 p_es->i_pes_real_size = 0;
478 /* Update the relations between the data packets */
479 p_es->p_last->p_next = p_data;
482 p_es->p_last = p_data;
484 /* Size of the payload carried in the data packet */
485 p_pes->i_pes_size += (p_data->p_payload_end
486 - p_data->p_payload_start);
488 /* We can check if the packet is finished */
489 if( p_pes->i_pes_size == p_es->i_pes_real_size )
491 /* The packet is finished, parse it */
492 input_ParsePES( p_input, p_es );
503 /*****************************************************************************
504 * GetID: Get the ID of a stream
505 *****************************************************************************/
506 static u16 GetID( data_packet_t * p_data )
510 i_id = p_data->p_payload_start[3]; /* stream_id */
513 /* FIXME : this is not valid if the header is split in multiple
515 /* stream_private_id */
516 i_id |= p_data->p_payload_start[ 9 + p_data->p_payload_start[8] ] << 8;
521 /*****************************************************************************
522 * DecodePSM: Decode the Program Stream Map information
523 *****************************************************************************
524 * FIXME : loads are not aligned in this function
525 *****************************************************************************/
526 static void DecodePSM( input_thread_t * p_input, data_packet_t * p_data )
528 stream_ps_data_t * p_demux =
529 (stream_ps_data_t *)p_input->stream.p_demux_data;
533 int i_new_es_number = 0;
535 if( p_data->p_payload_start + 10 > p_data->p_payload_end )
537 intf_ErrMsg( "PSM too short : packet corrupt" );
541 if( p_demux->b_has_PSM
542 && p_demux->i_PSM_version == (p_data->p_payload_start[6] & 0x1F) )
544 /* Already got that one. */
548 intf_DbgMsg( "Building PSM" );
549 p_demux->b_has_PSM = 1;
550 p_demux->i_PSM_version = p_data->p_payload_start[6] & 0x1F;
552 /* Go to elementary_stream_map_length, jumping over
553 * program_stream_info. */
554 p_byte = p_data->p_payload_start + 10
555 + U16_AT(&p_data->p_payload_start[8]);
556 if( p_byte > p_data->p_payload_end )
558 intf_ErrMsg( "PSM too short : packet corrupt" );
561 /* This is the full size of the elementary_stream_map.
562 * 2 == elementary_stream_map_length
563 * Please note that CRC_32 is not included in the length. */
564 p_end = p_byte + 2 + U16_AT(p_byte);
566 if( p_end > p_data->p_payload_end )
568 intf_ErrMsg( "PSM too short : packet corrupt" );
572 vlc_mutex_lock( &p_input->stream.stream_lock );
574 /* 4 == minimum useful size of a section */
575 while( p_byte + 4 <= p_end )
577 es_descriptor_t * p_es = NULL;
578 u8 i_stream_id = p_byte[1];
579 /* FIXME: there will be a problem with private streams... (same
582 /* Look for the ES in the ES table */
583 for( i = i_new_es_number;
584 i < p_input->stream.pp_programs[0]->i_es_number;
587 if( p_input->stream.pp_programs[0]->pp_es[i]->i_stream_id
590 p_es = p_input->stream.pp_programs[0]->pp_es[i];
591 if( p_es->i_type != p_byte[0] )
593 input_DelES( p_input, p_es );
598 /* Move the ES to the beginning. */
599 p_input->stream.pp_programs[0]->pp_es[i]
600 = p_input->stream.pp_programs[0]->pp_es[ i_new_es_number ];
601 p_input->stream.pp_programs[0]->pp_es[ i_new_es_number ]
609 /* The goal is to have all the ES we have just read in the
610 * beginning of the pp_es table, and all the others at the end,
611 * so that we can close them more easily at the end. */
614 p_es = input_AddES( p_input, p_input->stream.pp_programs[0],
616 p_es->i_type = p_byte[0];
617 p_es->b_audio = ( p_es->i_type == MPEG1_AUDIO_ES
618 || p_es->i_type == MPEG2_AUDIO_ES
619 || p_es->i_type == AC3_AUDIO_ES
620 || p_es->i_type == LPCM_AUDIO_ES
623 /* input_AddES has inserted the new element at the end. */
624 p_input->stream.pp_programs[0]->pp_es[
625 p_input->stream.pp_programs[0]->i_es_number ]
626 = p_input->stream.pp_programs[0]->pp_es[ i_new_es_number ];
627 p_input->stream.pp_programs[0]->pp_es[ i_new_es_number ] = p_es;
630 p_byte += 4 + U16_AT(&p_byte[2]);
633 /* Un-select the streams that are no longer parts of the program. */
634 for( i = i_new_es_number;
635 i < p_input->stream.pp_programs[0]->i_es_number;
638 /* We remove pp_es[i_new_es_member] and not pp_es[i] because the
639 * list will be emptied starting from the end */
640 input_DelES( p_input,
641 p_input->stream.pp_programs[0]->pp_es[i_new_es_number] );
645 intf_Msg( "input info: The stream map after the PSM is now :" );
646 input_DumpStream( p_input );
649 vlc_mutex_unlock( &p_input->stream.stream_lock );
652 /*****************************************************************************
653 * input_ParsePS: read the PS header
654 *****************************************************************************/
655 es_descriptor_t * input_ParsePS( input_thread_t * p_input,
656 data_packet_t * p_data )
659 es_descriptor_t * p_es = NULL;
661 i_code = p_data->p_payload_start[3];
663 if( i_code > 0xBC ) /* ES start code */
668 /* This is a PES packet. Find out if we want it or not. */
669 i_id = GetID( p_data );
671 vlc_mutex_lock( &p_input->stream.stream_lock );
672 if( p_input->stream.pp_programs[0]->b_is_ok )
674 /* Look only at the selected ES. */
675 for( i_dummy = 0; i_dummy < p_input->stream.i_selected_es_number;
678 if( p_input->stream.pp_selected_es[i_dummy] != NULL
679 && p_input->stream.pp_selected_es[i_dummy]->i_id == i_id )
681 p_es = p_input->stream.pp_selected_es[i_dummy];
688 stream_ps_data_t * p_demux =
689 (stream_ps_data_t *)p_input->stream.pp_programs[0]->p_demux_data;
691 /* Search all ES ; if not found -> AddES */
692 p_es = input_FindES( p_input, i_id );
694 if( p_es == NULL && !p_demux->b_has_PSM )
696 p_es = input_AddES( p_input, p_input->stream.pp_programs[0],
700 p_es->i_stream_id = p_data->p_payload_start[3];
702 /* Set stream type and auto-spawn. */
703 if( (i_id & 0xF0) == 0xE0 )
706 p_es->i_type = MPEG2_VIDEO_ES;
707 p_es->i_cat = VIDEO_ES;
709 if( !p_input->stream.b_seekable )
710 input_SelectES( p_input, p_es );
713 else if( (i_id & 0xE0) == 0xC0 )
716 p_es->i_type = MPEG2_AUDIO_ES;
718 p_es->i_cat = AUDIO_ES;
720 if( !p_input->stream.b_seekable )
721 if( main_GetIntVariable( INPUT_CHANNEL_VAR, 0 )
722 == (p_es->i_id & 0x1F) )
723 switch( main_GetIntVariable( INPUT_AUDIO_VAR, 0 ) )
726 main_PutIntVariable( INPUT_CHANNEL_VAR,
729 input_SelectES( p_input, p_es );
733 else if( (i_id & 0xF0FF) == 0x80BD )
735 /* AC3 audio (0x80->0x8F) */
736 p_es->i_type = AC3_AUDIO_ES;
738 p_es->i_cat = AUDIO_ES;
740 if( !p_input->stream.b_seekable )
741 if( main_GetIntVariable( INPUT_CHANNEL_VAR, 0 )
742 == ((p_es->i_id & 0xF00) >> 8) )
743 switch( main_GetIntVariable( INPUT_AUDIO_VAR, 0 ) )
746 main_PutIntVariable( INPUT_CHANNEL_VAR,
749 input_SelectES( p_input, p_es );
753 else if( (i_id & 0xE0FF) == 0x20BD )
755 /* Subtitles video (0x20->0x3F) */
756 p_es->i_type = DVD_SPU_ES;
757 p_es->i_cat = SPU_ES;
759 if( main_GetIntVariable( INPUT_SUBTITLE_VAR, -1 )
760 == ((p_es->i_id & 0x1F00) >> 8) )
762 if( !p_input->stream.b_seekable )
763 input_SelectES( p_input, p_es );
767 else if( (i_id & 0xF0FF) == 0xA0BD )
769 /* LPCM audio (0xA0->0xAF) */
770 p_es->i_type = LPCM_AUDIO_ES;
772 p_es->i_cat = AUDIO_ES;
773 /* FIXME : write the decoder */
777 p_es->i_type = UNKNOWN_ES;
781 } /* stream.b_is_ok */
782 vlc_mutex_unlock( &p_input->stream.stream_lock );
783 } /* i_code > 0xBC */
788 /*****************************************************************************
789 * input_DemuxPS: first step of demultiplexing: the PS header
790 *****************************************************************************/
791 void input_DemuxPS( input_thread_t * p_input, data_packet_t * p_data )
794 boolean_t b_trash = 0;
795 es_descriptor_t * p_es = NULL;
797 i_code = U32_AT( p_data->p_payload_start );
798 if( i_code <= 0x1BC )
802 case 0x1BA: /* PACK_START_CODE */
808 if( (p_data->p_payload_start[4] & 0xC0) == 0x40 )
813 p_byte = p_data->p_payload_start;
815 if( MoveChunk( p_header, &p_data, &p_byte, 14 ) != 14 )
817 intf_WarnMsg( 1, "Packet too short to have a header" );
822 ((mtime_t)(p_header[4] & 0x38) << 27) |
823 ((mtime_t)(U32_AT(p_header + 4) & 0x03FFF800)
825 ((( ((mtime_t)U16_AT(p_header + 6) << 16)
826 | (mtime_t)U16_AT(p_header + 8) ) & 0x03FFF800)
830 i_mux_rate = ((u32)U16_AT(p_header + 10) << 6)
831 | (p_header[12] >> 2);
832 /* FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
833 * This is the biggest kludge ever !
834 * I don't know what's wrong with mux_rate calculation
835 * but this heuristic work well : */
841 /* MPEG-1 SCR is like PTS. */
844 p_byte = p_data->p_payload_start;
846 if( MoveChunk( p_header, &p_data, &p_byte, 12 ) != 12 )
848 intf_WarnMsg( 1, "Packet too short to have a header" );
853 ((mtime_t)(p_header[4] & 0x0E) << 29) |
854 (((mtime_t)U32_AT(p_header + 4) & 0xFFFE00) << 6) |
855 ((mtime_t)p_header[7] << 7) |
856 ((mtime_t)p_header[8] >> 1);
859 i_mux_rate = (U32_AT(p_header + 8) & 0x7FFFFE) >> 1;
861 /* Call the pace control. */
862 input_ClockManageRef( p_input, p_input->stream.pp_programs[0],
865 if( i_mux_rate != p_input->stream.i_mux_rate
866 && p_input->stream.i_mux_rate )
869 "Mux_rate changed - expect cosmetic errors");
871 p_input->stream.i_mux_rate = i_mux_rate;
877 case 0x1BB: /* SYSTEM_START_CODE */
878 b_trash = 1; /* Nothing interesting */
881 case 0x1BC: /* PROGRAM_STREAM_MAP_CODE */
882 DecodePSM( p_input, p_data );
886 case 0x1B9: /* PROGRAM_END_CODE */
891 /* This should not happen */
893 intf_WarnMsg( 3, "Unwanted packet received with start code 0x%.8x",
899 p_es = input_ParsePS( p_input, p_data );
901 vlc_mutex_lock( &p_input->stream.control.control_lock );
902 if( p_es != NULL && p_es->p_decoder_fifo != NULL
903 && (!p_es->b_audio || !p_input->stream.control.b_mute) )
905 vlc_mutex_unlock( &p_input->stream.control.control_lock );
909 input_GatherPES( p_input, p_data, p_es, 1, 0 );
913 vlc_mutex_unlock( &p_input->stream.control.control_lock );
918 /* Trash the packet if it has no payload or if it isn't selected */
921 p_input->pf_delete_packet( p_input->p_method_data, p_data );
923 p_input->c_packets_trashed++;
933 /*****************************************************************************
934 * input_DemuxTS: first step of demultiplexing: the TS header
935 *****************************************************************************/
936 void input_DemuxTS( input_thread_t * p_input, data_packet_t * p_data )
940 boolean_t b_adaptation; /* Adaptation field is present */
941 boolean_t b_payload; /* Packet carries payload */
942 boolean_t b_unit_start; /* A PSI or a PES start in the packet */
943 boolean_t b_trash = 0; /* Is the packet unuseful ? */
944 boolean_t b_lost = 0; /* Was there a packet loss ? */
945 boolean_t b_psi = 0; /* Is this a PSI ? */
946 es_descriptor_t * p_es = NULL;
947 es_ts_data_t * p_es_demux = NULL;
948 pgrm_ts_data_t * p_pgrm_demux = NULL;
950 #define p (p_data->p_buffer)
951 /* Extract flags values from TS common header. */
952 i_pid = U16_AT(&p[1]) & 0x1fff;
953 b_unit_start = (p[1] & 0x40);
954 b_adaptation = (p[3] & 0x20);
955 b_payload = (p[3] & 0x10);
957 /* Find out the elementary stream. */
958 vlc_mutex_lock( &p_input->stream.stream_lock );
960 p_es= input_FindES( p_input, i_pid );
962 if( (p_es != NULL) && (p_es->p_demux_data != NULL) )
964 p_es_demux = (es_ts_data_t *)p_es->p_demux_data;
966 if( p_es_demux->b_psi )
969 p_pgrm_demux = (pgrm_ts_data_t *)p_es->p_pgrm->p_demux_data;
972 vlc_mutex_lock( &p_input->stream.control.control_lock );
973 if( ( p_es == NULL ) || (p_es->b_audio && p_input->stream.control.b_mute) )
975 /* Not selected. Just read the adaptation field for a PCR. */
978 else if( p_es->p_decoder_fifo == NULL && !b_psi )
981 vlc_mutex_unlock( &p_input->stream.control.control_lock );
982 vlc_mutex_unlock( &p_input->stream.stream_lock );
985 /* Don't change the order of the tests : if b_psi then p_pgrm_demux
986 * may still be null. Who said it was ugly ? */
987 if( ( p_es != NULL ) &&
988 ((p_es->p_decoder_fifo != NULL) || b_psi
989 || (p_pgrm_demux->i_pcr_pid == i_pid) ) )
995 /* Extract adaptation field information if any */
999 /* We don't have any adaptation_field, so payload starts
1000 * immediately after the 4 byte TS header */
1001 p_data->p_payload_start += 4;
1005 /* p[4] is adaptation_field_length minus one */
1006 p_data->p_payload_start += 5 + p[4];
1008 /* The adaptation field can be limited to the
1009 * adaptation_field_length byte, so that there is nothing to do:
1010 * skip this possibility */
1013 /* If the packet has both adaptation_field and payload,
1014 * adaptation_field cannot be more than 182 bytes long; if
1015 * there is only an adaptation_field, it must fill the next
1017 if( b_payload ? (p[4] > 182) : (p[4] != 183) )
1020 "invalid TS adaptation field (%p)",
1022 p_data->b_discard_payload = 1;
1024 p_es->c_invalid_packets++;
1028 /* Now we are sure that the byte containing flags is present:
1032 /* discontinuity_indicator */
1036 "discontinuity_indicator"
1037 " encountered by TS demux (position read: %d,"
1039 p[5] & 0x80, p_es_demux->i_continuity_counter );
1041 /* If the PID carries the PCR, there will be a system
1042 * time-based discontinuity. We let the PCR decoder
1044 p_es->p_pgrm->i_synchro_state = SYNCHRO_REINIT;
1046 /* There also may be a continuity_counter
1047 * discontinuity: resynchronise our counter with
1048 * the one of the stream. */
1049 p_es_demux->i_continuity_counter = (p[3] & 0x0f) - 1;
1052 /* If this is a PCR_PID, and this TS packet contains a
1053 * PCR, we pass it along to the PCR decoder. */
1055 if( !b_psi && (p_pgrm_demux->i_pcr_pid == i_pid) && (p[5] & 0x10) )
1057 /* There should be a PCR field in the packet, check
1058 * if the adaptation field is long enough to carry
1065 ( (mtime_t)U32_AT((u32*)&p[6]) << 1 )
1067 /* Call the pace control. */
1068 input_ClockManageRef( p_input, p_es->p_pgrm,
1072 } /* valid TS adaptation field ? */
1074 } /* has adaptation field */
1075 /* Check the continuity of the stream. */
1076 i_dummy = ((p[3] & 0x0f) - p_es_demux->i_continuity_counter) & 0x0f;
1079 /* Everything is ok, just increase our counter */
1080 (p_es_demux->i_continuity_counter)++;
1084 if( !b_payload && i_dummy == 0 )
1086 /* This is a packet without payload, this is allowed by the
1087 * draft. As there is nothing interesting in this packet
1088 * (except PCR that have already been handled), we can trash
1091 "Packet without payload received by TS demux" );
1094 else if( i_dummy <= 0 )
1096 /* FIXME: this can never happen, can it ? --Meuuh */
1097 /* Duplicate packet: mark it as being to be trashed. */
1098 intf_WarnMsg( 3, "Duplicate packet received by TS demux" );
1101 else if( p_es_demux->i_continuity_counter == 0xFF )
1103 /* This means that the packet is the first one we receive for
1104 * this ES since the continuity counter ranges between 0 and
1105 * 0x0F excepts when it has been initialized by the input:
1106 * init the counter to the correct value. */
1107 intf_DbgMsg( "First packet for PID %d received by TS demux",
1109 p_es_demux->i_continuity_counter = (p[3] & 0x0f);
1113 /* This can indicate that we missed a packet or that the
1114 * continuity_counter wrapped and we received a dup packet:
1115 * as we don't know, do as if we missed a packet to be sure
1116 * to recover from this situation */
1118 "Packet lost by TS demux: current %d, packet %d",
1119 p_es_demux->i_continuity_counter & 0x0f,
1122 p_es_demux->i_continuity_counter = p[3] & 0x0f;
1123 } /* not continuous */
1125 } /* if selected or PCR */
1127 /* Trash the packet if it has no payload or if it isn't selected */
1130 p_input->pf_delete_packet( p_input->p_method_data, p_data );
1132 p_input->c_packets_trashed++;
1139 /* The payload contains PSI tables */
1140 input_DemuxPSI( p_input, p_data, p_es,
1141 b_unit_start, b_lost );
1146 /* The payload carries a PES stream */
1147 input_GatherPES( p_input, p_data, p_es, b_unit_start, b_lost );
1157 * PSI demultiplexing and decoding
1160 /*****************************************************************************
1161 * DemuxPSI : makes up complete PSI data
1162 *****************************************************************************/
1163 void input_DemuxPSI( input_thread_t * p_input, data_packet_t * p_data,
1164 es_descriptor_t * p_es, boolean_t b_unit_start, boolean_t b_lost )
1166 es_ts_data_t * p_demux_data;
1168 p_demux_data = (es_ts_data_t *)p_es->p_demux_data;
1170 #define p_psi (p_demux_data->p_psi_section)
1171 #define p (p_data->p_payload_start)
1175 /* unit_start set to 1 -> presence of a pointer field
1176 * (see ISO/IEC 13818 (2.4.4.2) which should be set to 0x00 */
1177 if( (u8)p[0] != 0x00 )
1180 "Non zero pointer field found. Trying to continue" );
1186 /* This is the begining of a new section */
1188 if( ((u8)(p[1]) & 0xc0) != 0x80 )
1190 intf_WarnMsg( 2, "Invalid PSI packet" );
1195 p_psi->i_section_length = U16_AT(p+1) & 0x0fff;
1196 p_psi->b_section_complete = 0;
1197 p_psi->i_read_in_section = 0;
1198 p_psi->i_section_number = (u8)p[6];
1200 if( p_psi->b_is_complete || p_psi->i_section_number == 0 )
1202 /* This is a new PSI packet */
1203 p_psi->b_is_complete = 0;
1205 p_psi->i_version_number = ( p[5] >> 1 ) & 0x1f;
1206 p_psi->i_last_section_number = (u8)p[7];
1208 /* We'll write at the begining of the buffer */
1209 p_psi->p_current = p_psi->buffer;
1213 if( p_psi->b_section_complete )
1215 /* New Section of an already started PSI */
1216 p_psi->b_section_complete = 0;
1218 if( p_psi->i_version_number != (( p[5] >> 1 ) & 0x1f) )
1220 intf_WarnMsg( 2,"PSI version differs inside same PAT" );
1223 if( p_psi->i_section_number + 1 != (u8)p[6] )
1226 "PSI Section discontinuity. Packet lost ?");
1230 p_psi->i_section_number++;
1234 intf_WarnMsg( 2, "Received unexpected new PSI section" );
1239 } /* b_unit_start */
1241 if( !p_psi->b_trash )
1244 if( (p_data->p_payload_end - p) >=
1245 ( p_psi->i_section_length - p_psi->i_read_in_section ) )
1247 /* The end of the section is in this TS packet */
1248 memcpy( p_psi->p_current, p,
1249 (p_psi->i_section_length - p_psi->i_read_in_section) );
1251 p_psi->b_section_complete = 1;
1253 (p_psi->i_section_length - p_psi->i_read_in_section);
1255 if( p_psi->i_section_number == p_psi->i_last_section_number )
1257 /* This was the last section of PSI */
1258 p_psi->b_is_complete = 1;
1263 memcpy( p_psi->buffer, p, p_data->p_payload_end - p );
1264 p_psi->i_read_in_section+= p_data->p_payload_end - p;
1266 p_psi->p_current += p_data->p_payload_end - p;
1270 if ( p_psi->b_is_complete )
1272 switch( p_demux_data->i_psi_type)
1275 input_DecodePAT( p_input, p_es );
1278 input_DecodePMT( p_input, p_es );
1281 intf_WarnMsg(2, "Received unknown PSI in demuxPSI");
1290 /*****************************************************************************
1291 * DecodePAT : Decodes Programm association table and deal with it
1292 *****************************************************************************/
1293 static void input_DecodePAT( input_thread_t * p_input, es_descriptor_t * p_es )
1296 stream_ts_data_t * p_stream_data;
1297 es_ts_data_t * p_demux_data;
1299 p_demux_data = (es_ts_data_t *)p_es->p_demux_data;
1300 p_stream_data = (stream_ts_data_t *)p_input->stream.p_demux_data;
1302 #define p_psi (p_demux_data->p_psi_section)
1304 if( p_stream_data->i_pat_version != p_psi->i_version_number )
1306 /* PAT has changed. We are going to delete all programms and
1307 * create new ones. We chose not to only change what was needed
1308 * as a PAT change may mean the stream is radically changing and
1309 * this is a secure method to avoid krashes */
1310 pgrm_descriptor_t * p_pgrm;
1311 es_descriptor_t * p_current_es;
1312 es_ts_data_t * p_es_demux;
1313 pgrm_ts_data_t * p_pgrm_demux;
1314 byte_t * p_current_data;
1316 int i_section_length,i_program_id,i_pmt_pid;
1317 int i_loop, i_current_section;
1319 p_current_data = p_psi->buffer;
1322 for( i_loop = 0; i_loop < p_input->stream.i_pgrm_number; i_loop++ )
1324 input_DelProgram( p_input, p_input->stream.pp_programs[i_loop] );
1329 i_section_length = U16_AT(p_current_data+1) & 0x0fff;
1330 i_current_section = (u8)p_current_data[6];
1332 for( i_loop = 0; i_loop < (i_section_length-9)/4 ; i_loop++ )
1334 i_program_id = U16_AT(p_current_data + i_loop*4 + 8);
1335 i_pmt_pid = U16_AT( p_current_data + i_loop*4 + 10) & 0x1fff;
1337 /* If program = 0, we're having info about NIT not PMT */
1340 /* Add this program */
1341 p_pgrm = input_AddProgram( p_input, i_program_id,
1342 sizeof( pgrm_ts_data_t ) );
1344 /* whatis the PID of the PMT of this program */
1345 p_pgrm_demux = (pgrm_ts_data_t *)p_pgrm->p_demux_data;
1346 p_pgrm_demux->i_pmt_version = PMT_UNINITIALIZED;
1348 /* Add the PMT ES to this program */
1349 p_current_es = input_AddES( p_input, p_pgrm,(u16)i_pmt_pid,
1350 sizeof( es_ts_data_t) );
1351 p_es_demux = (es_ts_data_t *)p_current_es->p_demux_data;
1352 p_es_demux->b_psi = 1;
1353 p_es_demux->i_psi_type = PSI_IS_PMT;
1355 p_es_demux->p_psi_section =
1356 malloc( sizeof( psi_section_t ) );
1357 p_es_demux->p_psi_section->b_is_complete = 0;
1361 p_current_data+=3+i_section_length;
1363 } while( i_current_section < p_psi->i_last_section_number );
1365 /* Go to the beginning of the next section*/
1366 p_stream_data->i_pat_version = p_psi->i_version_number;
1373 /*****************************************************************************
1374 * DecodePMT : decode a given Program Stream Map
1375 * ***************************************************************************
1376 * When the PMT changes, it may mean a deep change in the stream, and it is
1377 * careful to delete the ES and add them again. If the PMT doesn't change,
1378 * there no need to do anything.
1379 *****************************************************************************/
1380 static void input_DecodePMT( input_thread_t * p_input, es_descriptor_t * p_es )
1383 pgrm_ts_data_t * p_pgrm_data;
1384 es_ts_data_t * p_demux_data;
1386 p_demux_data = (es_ts_data_t *)p_es->p_demux_data;
1387 p_pgrm_data = (pgrm_ts_data_t *)p_es->p_pgrm->p_demux_data;
1389 #define p_psi (p_demux_data->p_psi_section)
1391 if( p_psi->i_version_number != p_pgrm_data->i_pmt_version )
1393 es_descriptor_t * p_new_es;
1394 es_ts_data_t * p_es_demux;
1395 byte_t * p_current_data, * p_current_section;
1396 int i_section_length,i_current_section;
1397 int i_prog_info_length, i_loop;
1398 int i_es_info_length, i_pid, i_stream_type;
1399 int i_audio_es, i_spu_es;
1400 int i_required_audio_es, i_required_spu_es;
1402 p_current_section = p_psi->buffer;
1403 p_current_data = p_psi->buffer;
1405 p_pgrm_data->i_pcr_pid = U16_AT(p_current_section + 8) & 0x1fff;
1410 /* Lock stream information */
1411 vlc_mutex_lock( &p_input->stream.stream_lock );
1413 /* Get the number of the required audio stream */
1414 if( p_main->b_audio )
1416 /* Default is the first one */
1417 i_required_audio_es = main_GetIntVariable( INPUT_CHANNEL_VAR, 1 );
1418 if( i_required_audio_es < 0 )
1420 main_PutIntVariable( INPUT_CHANNEL_VAR, 1 );
1421 i_required_audio_es = 1;
1426 i_required_audio_es = 0;
1429 /* Same thing for subtitles */
1430 if( p_main->b_video )
1432 /* for spu, default is none */
1433 i_required_spu_es = main_GetIntVariable( INPUT_SUBTITLE_VAR, 0 );
1434 if( i_required_spu_es < 0 )
1436 main_PutIntVariable( INPUT_SUBTITLE_VAR, 0 );
1437 i_required_spu_es = 0;
1442 i_required_spu_es = 0;
1445 /* Delete all ES in this program except the PSI */
1446 for( i_loop=0; i_loop < p_es->p_pgrm->i_es_number; i_loop++ )
1448 p_es_demux = (es_ts_data_t *)
1449 p_es->p_pgrm->pp_es[i_loop]->p_demux_data;
1450 if ( ! p_es_demux->b_psi )
1451 input_DelES( p_input, p_es->p_pgrm->pp_es[i_loop] );
1454 /* Then add what we received in this PMT */
1458 i_section_length = U16_AT(p_current_data+1) & 0x0fff;
1459 i_current_section = (u8)p_current_data[6];
1460 i_prog_info_length = U16_AT(p_current_data+10) & 0x0fff;
1462 /* For the moment we ignore program descriptors */
1463 p_current_data += 12+i_prog_info_length;
1465 /* The end of the section, before the CRC is at
1466 * p_current_section + i_section_length -1 */
1467 while( p_current_data < p_current_section + i_section_length -1 )
1469 i_stream_type = (int)p_current_data[0];
1470 i_pid = U16_AT( p_current_data + 1 ) & 0x1fff;
1471 i_es_info_length = U16_AT( p_current_data + 3 ) & 0x0fff;
1473 /* Add this ES to the program */
1474 p_new_es = input_AddES( p_input, p_es->p_pgrm,
1475 (u16)i_pid, sizeof( es_ts_data_t ) );
1477 /* Tell the decoders what kind of stream it is */
1478 p_new_es->i_type = i_stream_type;
1480 /* Tell the interface what kind of stream it is and select
1481 * the required ones */
1482 switch( i_stream_type )
1484 case MPEG1_VIDEO_ES:
1485 case MPEG2_VIDEO_ES:
1486 p_new_es->i_cat = VIDEO_ES;
1487 input_SelectES( p_input, p_new_es );
1489 case MPEG1_AUDIO_ES:
1490 case MPEG2_AUDIO_ES:
1491 case LPCM_AUDIO_ES :
1492 p_new_es->i_cat = AUDIO_ES;
1494 if( i_audio_es == i_required_audio_es )
1495 input_SelectES( p_input, p_new_es );
1498 p_new_es->i_stream_id = 0xBD;
1499 p_new_es->i_cat = AUDIO_ES;
1501 if( i_audio_es == i_required_audio_es )
1502 input_SelectES( p_input, p_new_es );
1504 /* Not sure this one is fully norm-compliant */
1506 p_new_es->i_cat = SPU_ES;
1508 if( i_spu_es == i_required_spu_es )
1509 input_SelectES( p_input, p_new_es );
1512 p_new_es->i_cat = UNKNOWN_ES;
1516 p_current_data += 5 + i_es_info_length;
1519 /* Go to the beginning of the next section*/
1520 p_current_data += 3+i_section_length;
1522 p_current_section+=1;
1524 } while( i_current_section < p_psi->i_last_section_number );
1526 if( i_required_audio_es > i_audio_es )
1527 intf_WarnMsg( 2, "TS input: Non-existing audio es required." );
1529 if( i_required_spu_es > i_spu_es )
1530 intf_WarnMsg( 2, "TS input: Non-existing subtitles es required." );
1532 p_pgrm_data->i_pmt_version = p_psi->i_version_number;
1534 /* inform interface that stream has changed */
1535 p_input->stream.b_changed = 1;
1541 vlc_mutex_unlock( &p_input->stream.stream_lock );