1 /*****************************************************************************
2 * mpeg_system.c: TS, PS and PES management
3 *****************************************************************************
4 * Copyright (C) 1998, 1999, 2000 VideoLAN
5 * $Id: mpeg_system.c,v 1.41 2001/03/05 16:00:30 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 *****************************************************************************/
42 #include "stream_control.h"
43 #include "input_ext-intf.h"
44 #include "input_ext-dec.h"
47 #include "mpeg_system.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( 3, "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) + 6;
152 /* First read the 6 header bytes common to all PES packets:
153 * use them to test the PES validity */
154 if( (p_header[0] || p_header[1] || (p_header[2] != 1)) )
156 /* packet_start_code_prefix != 0x000001 */
157 intf_ErrMsg( "PES packet doesn't start with 0x000001 : data loss" );
158 p_input->pf_delete_pes( p_input->p_method_data, p_pes );
163 int i_pes_header_size, i_payload_size;
165 if ( p_es->i_pes_real_size &&
166 (p_es->i_pes_real_size != p_pes->i_pes_size) )
168 /* PES_packet_length is set and != total received payload */
169 /* Warn the decoder that the data may be corrupt. */
170 intf_WarnMsg( 3, "PES sizes do not match : packet corrupted" );
173 switch( p_es->i_stream_id )
175 case 0xBC: /* Program stream map */
176 case 0xBE: /* Padding */
177 case 0xBF: /* Private stream 2 */
180 case 0xFF: /* Program stream directory */
181 case 0xF2: /* DSMCC stream */
182 case 0xF8: /* ITU-T H.222.1 type E stream */
183 /* The payload begins immediately after the 6 bytes header, so
184 * we have finished with the parsing */
185 i_pes_header_size = 6;
189 if( (p_header[6] & 0xC0) == 0x80 )
191 /* MPEG-2 : the PES header contains at least 3 more bytes. */
193 boolean_t b_has_pts, b_has_dts;
194 byte_t p_full_header[12];
196 p_pes->b_data_alignment = p_header[6] & 0x04;
198 i_max_len = MoveChunk( p_full_header, &p_data, &p_byte, 12 );
202 "PES packet too short to have a MPEG-2 header" );
203 p_input->pf_delete_pes( p_input->p_method_data,
209 b_has_pts = p_full_header[0] & 0x80;
210 b_has_dts = p_full_header[0] & 0x40;
211 i_pes_header_size = p_full_header[1] + 9;
213 /* Now parse the optional header extensions */
219 "PES packet too short to have a MPEG-2 header" );
220 p_input->pf_delete_pes( p_input->p_method_data,
225 p_pes->i_pts = input_ClockGetTS( p_input, p_es->p_pgrm,
226 ( ((mtime_t)(p_full_header[2] & 0x0E) << 29) |
227 (((mtime_t)U32_AT(p_full_header + 2) & 0xFFFE00) << 6) |
228 ((mtime_t)p_full_header[5] << 7) |
229 ((mtime_t)p_full_header[6] >> 1) ) );
236 "PES packet too short to have a MPEG-2 header" );
237 p_input->pf_delete_pes( p_input->p_method_data,
242 p_pes->i_dts = input_ClockGetTS( p_input, p_es->p_pgrm,
243 ( ((mtime_t)(p_full_header[7] & 0x0E) << 29) |
244 (((mtime_t)U16_AT(p_full_header + 8) << 14)
246 ((mtime_t)U16_AT(p_full_header + 10) >> 1) ) );
252 /* Probably MPEG-1 */
253 boolean_t b_has_pts, b_has_dts;
255 i_pes_header_size = 6;
256 p_data = p_pes->p_first;
257 p_byte = p_data->p_payload_start;
258 /* Cannot fail because the previous one succeeded. */
259 MoveChunk( NULL, &p_data, &p_byte, 6 );
261 while( *p_byte == 0xFF && i_pes_header_size < 23 )
264 if( MoveChunk( NULL, &p_data, &p_byte, 1 ) != 1 )
267 "PES packet too short to have a MPEG-1 header" );
268 p_input->pf_delete_pes( p_input->p_method_data, p_pes );
273 if( i_pes_header_size == 23 )
275 intf_ErrMsg( "Too much MPEG-1 stuffing" );
276 p_input->pf_delete_pes( p_input->p_method_data, p_pes );
281 if( (*p_byte & 0xC0) == 0x40 )
283 /* Don't ask why... --Meuuh */
284 /* Erm... why ? --Sam */
285 /* Well... According to the recommendation, it is for
286 * STD_buffer_scale and STD_buffer_size. --Meuuh */
287 i_pes_header_size += 2;
288 if( MoveChunk( NULL, &p_data, &p_byte, 2 ) != 2 )
291 "PES packet too short to have a MPEG-1 header" );
292 p_input->pf_delete_pes( p_input->p_method_data, p_pes );
300 b_has_pts = *p_byte & 0x20;
301 b_has_dts = *p_byte & 0x10;
307 i_pes_header_size += 4;
308 if( MoveChunk( p_ts, &p_data, &p_byte, 5 ) != 5 )
311 "PES packet too short to have a MPEG-1 header" );
312 p_input->pf_delete_pes( p_input->p_method_data, p_pes );
317 p_pes->i_pts = input_ClockGetTS( p_input, p_es->p_pgrm,
318 ( ((mtime_t)(p_ts[0] & 0x0E) << 29) |
319 (((mtime_t)U32_AT(p_ts) & 0xFFFE00) << 6) |
320 ((mtime_t)p_ts[3] << 7) |
321 ((mtime_t)p_ts[4] >> 1) ) );
325 i_pes_header_size += 5;
326 if( MoveChunk( p_ts, &p_data, &p_byte, 5 ) != 5 )
329 "PES packet too short to have a MPEG-1 header" );
330 p_input->pf_delete_pes( p_input->p_method_data,
336 p_pes->i_dts = input_ClockGetTS( p_input,
338 ( ((mtime_t)(p_ts[0] & 0x0E) << 29) |
339 (((mtime_t)U32_AT(p_ts) & 0xFFFE00) << 6) |
340 ((mtime_t)p_ts[3] << 7) |
341 ((mtime_t)p_ts[4] >> 1) ) );
349 if( p_es->i_stream_id == 0xbd )
351 /* With private stream 1, the first byte of the payload
352 * is a stream_private_id, so skip it. */
356 /* Now we've parsed the header, we just have to indicate in some
357 * specific data packets where the PES payload begins (renumber
358 * p_payload_start), so that the decoders can find the beginning
359 * of their data right out of the box. */
360 p_data = p_pes->p_first;
361 i_payload_size = p_data->p_payload_end
362 - p_data->p_payload_start;
363 while( i_pes_header_size > i_payload_size )
365 /* These packets are entirely filled by the PES header. */
366 i_pes_header_size -= i_payload_size;
367 p_data->p_payload_start = p_data->p_payload_end;
368 /* Go to the next data packet. */
369 if( (p_data = p_data->p_next) == NULL )
371 intf_ErrMsg( "PES header bigger than payload" );
372 p_input->pf_delete_pes( p_input->p_method_data, p_pes );
376 i_payload_size = p_data->p_payload_end
377 - p_data->p_payload_start;
379 /* This last packet is partly header, partly payload. */
380 if( i_payload_size < i_pes_header_size )
382 intf_ErrMsg( "PES header bigger than payload" );
383 p_input->pf_delete_pes( p_input->p_method_data, p_pes );
387 p_data->p_payload_start += i_pes_header_size;
389 /* Now we can eventually put the PES packet in the decoder's
391 if( p_es->p_decoder_fifo != NULL )
393 input_DecodePES( p_es->p_decoder_fifo, p_pes );
397 intf_ErrMsg("No fifo to receive PES %p (who wrote this damn code ?)",
399 p_input->pf_delete_pes( p_input->p_method_data, p_pes );
407 /*****************************************************************************
409 *****************************************************************************
410 * Gather a PES packet.
411 *****************************************************************************/
412 void input_GatherPES( input_thread_t * p_input, data_packet_t * p_data,
413 es_descriptor_t * p_es,
414 boolean_t b_unit_start, boolean_t b_packet_lost )
416 #define p_pes (p_es->p_pes)
418 //intf_DbgMsg("PES-demultiplexing %p (%p)", p_ts_packet, p_pes);
420 /* If we lost data, insert a NULL data packet (philosophy : 0 is quite
421 * often an escape sequence in decoders, so that should make them wait
422 * for the next start code). */
425 input_NullPacket( p_input, p_es );
428 if( b_unit_start && p_pes != NULL )
430 /* If the data packet contains the begining of a new PES packet, and
431 * if we were reassembling a PES packet, then the PES should be
432 * complete now, so parse its header and give it to the decoders. */
433 input_ParsePES( p_input, p_es );
436 if( !b_unit_start && p_pes == NULL )
438 /* Random access... */
439 p_input->pf_delete_packet( p_input->p_method_data, p_data );
445 /* If we are at the beginning of a new PES packet, we must fetch
446 * a new PES buffer to begin with the reassembly of this PES
447 * packet. This is also here that we can synchronize with the
448 * stream if we lost packets or if the decoder has just
450 if( (p_pes = p_input->pf_new_pes( p_input->p_method_data ) ) == NULL )
452 intf_ErrMsg("Out of memory");
453 p_input->b_error = 1;
456 p_pes->i_rate = p_input->stream.control.i_rate;
457 p_pes->p_first = p_data;
459 /* If the PES header fits in the first data packet, we can
460 * already set p_gather->i_pes_real_size. */
461 if( p_data->p_payload_end - p_data->p_payload_start
464 p_es->i_pes_real_size =
465 U16_AT(p_data->p_payload_start + 4) + 6;
470 p_es->i_pes_real_size = 0;
475 /* Update the relations between the data packets */
476 p_es->p_last->p_next = p_data;
479 p_es->p_last = p_data;
481 /* Size of the payload carried in the data packet */
482 p_pes->i_pes_size += (p_data->p_payload_end
483 - p_data->p_payload_start);
485 /* We can check if the packet is finished */
486 if( p_pes->i_pes_size == p_es->i_pes_real_size )
488 /* The packet is finished, parse it */
489 input_ParsePES( p_input, p_es );
500 /*****************************************************************************
501 * GetID: Get the ID of a stream
502 *****************************************************************************/
503 static u16 GetID( data_packet_t * p_data )
507 i_id = p_data->p_payload_start[3]; /* stream_id */
510 /* FIXME : this is not valid if the header is split in multiple
512 /* stream_private_id */
513 i_id |= p_data->p_payload_start[ 9 + p_data->p_payload_start[8] ] << 8;
518 /*****************************************************************************
519 * DecodePSM: Decode the Program Stream Map information
520 *****************************************************************************
521 * FIXME : loads are not aligned in this function
522 *****************************************************************************/
523 static void DecodePSM( input_thread_t * p_input, data_packet_t * p_data )
525 stream_ps_data_t * p_demux =
526 (stream_ps_data_t *)p_input->stream.p_demux_data;
530 int i_new_es_number = 0;
532 if( p_data->p_payload_start + 10 > p_data->p_payload_end )
534 intf_ErrMsg( "PSM too short : packet corrupt" );
538 if( p_demux->b_has_PSM
539 && p_demux->i_PSM_version == (p_data->p_payload_start[6] & 0x1F) )
541 /* Already got that one. */
545 intf_DbgMsg( "Building PSM" );
546 p_demux->b_has_PSM = 1;
547 p_demux->i_PSM_version = p_data->p_payload_start[6] & 0x1F;
549 /* Go to elementary_stream_map_length, jumping over
550 * program_stream_info. */
551 p_byte = p_data->p_payload_start + 10
552 + U16_AT(&p_data->p_payload_start[8]);
553 if( p_byte > p_data->p_payload_end )
555 intf_ErrMsg( "PSM too short : packet corrupt" );
558 /* This is the full size of the elementary_stream_map.
559 * 2 == elementary_stream_map_length
560 * Please note that CRC_32 is not included in the length. */
561 p_end = p_byte + 2 + U16_AT(p_byte);
563 if( p_end > p_data->p_payload_end )
565 intf_ErrMsg( "PSM too short : packet corrupt" );
569 vlc_mutex_lock( &p_input->stream.stream_lock );
571 /* 4 == minimum useful size of a section */
572 while( p_byte + 4 <= p_end )
574 es_descriptor_t * p_es = NULL;
575 u8 i_stream_id = p_byte[1];
576 /* FIXME: there will be a problem with private streams... (same
579 /* Look for the ES in the ES table */
580 for( i = i_new_es_number;
581 i < p_input->stream.pp_programs[0]->i_es_number;
584 if( p_input->stream.pp_programs[0]->pp_es[i]->i_stream_id
587 p_es = p_input->stream.pp_programs[0]->pp_es[i];
588 if( p_es->i_type != p_byte[0] )
590 input_DelES( p_input, p_es );
595 /* Move the ES to the beginning. */
596 p_input->stream.pp_programs[0]->pp_es[i]
597 = p_input->stream.pp_programs[0]->pp_es[ i_new_es_number ];
598 p_input->stream.pp_programs[0]->pp_es[ i_new_es_number ]
606 /* The goal is to have all the ES we have just read in the
607 * beginning of the pp_es table, and all the others at the end,
608 * so that we can close them more easily at the end. */
611 p_es = input_AddES( p_input, p_input->stream.pp_programs[0],
613 p_es->i_type = p_byte[0];
614 p_es->b_audio = ( p_es->i_type == MPEG1_AUDIO_ES
615 || p_es->i_type == MPEG2_AUDIO_ES
616 || p_es->i_type == AC3_AUDIO_ES
617 || p_es->i_type == LPCM_AUDIO_ES
620 /* input_AddES has inserted the new element at the end. */
621 p_input->stream.pp_programs[0]->pp_es[
622 p_input->stream.pp_programs[0]->i_es_number ]
623 = p_input->stream.pp_programs[0]->pp_es[ i_new_es_number ];
624 p_input->stream.pp_programs[0]->pp_es[ i_new_es_number ] = p_es;
627 p_byte += 4 + U16_AT(&p_byte[2]);
630 /* Un-select the streams that are no longer parts of the program. */
631 for( i = i_new_es_number;
632 i < p_input->stream.pp_programs[0]->i_es_number;
635 /* We remove pp_es[i_new_es_member] and not pp_es[i] because the
636 * list will be emptied starting from the end */
637 input_DelES( p_input,
638 p_input->stream.pp_programs[0]->pp_es[i_new_es_number] );
642 intf_Msg( "input info: The stream map after the PSM is now :" );
643 input_DumpStream( p_input );
646 vlc_mutex_unlock( &p_input->stream.stream_lock );
649 /*****************************************************************************
650 * input_ParsePS: read the PS header
651 *****************************************************************************/
652 es_descriptor_t * input_ParsePS( input_thread_t * p_input,
653 data_packet_t * p_data )
656 es_descriptor_t * p_es = NULL;
658 i_code = p_data->p_payload_start[3];
659 if( i_code > 0xBC ) /* ES start code */
664 /* This is a PES packet. Find out if we want it or not. */
665 i_id = GetID( p_data );
667 vlc_mutex_lock( &p_input->stream.stream_lock );
668 if( p_input->stream.pp_programs[0]->b_is_ok )
670 /* Look only at the selected ES. */
671 for( i_dummy = 0; i_dummy < p_input->stream.i_selected_es_number;
674 if( p_input->stream.pp_selected_es[i_dummy] != NULL
675 && p_input->stream.pp_selected_es[i_dummy]->i_id == i_id )
677 p_es = p_input->stream.pp_selected_es[i_dummy];
684 stream_ps_data_t * p_demux =
685 (stream_ps_data_t *)p_input->stream.pp_programs[0]->p_demux_data;
687 /* Search all ES ; if not found -> AddES */
688 p_es = input_FindES( p_input, i_id );
690 if( p_es == NULL && !p_demux->b_has_PSM )
692 p_es = input_AddES( p_input, p_input->stream.pp_programs[0],
696 p_es->i_stream_id = p_data->p_payload_start[3];
698 /* Set stream type and auto-spawn. */
699 if( (i_id & 0xF0) == 0xE0 )
702 p_es->i_type = MPEG2_VIDEO_ES;
704 if( !p_input->stream.b_seekable )
705 input_SelectES( p_input, p_es );
708 else if( (i_id & 0xE0) == 0xC0 )
711 p_es->i_type = MPEG2_AUDIO_ES;
714 if( !p_input->stream.b_seekable )
715 if( main_GetIntVariable( INPUT_CHANNEL_VAR, 0 )
716 == (p_es->i_id & 0x1F) )
717 switch( main_GetIntVariable( INPUT_AUDIO_VAR, 0 ) )
720 main_PutIntVariable( INPUT_CHANNEL_VAR,
723 input_SelectES( p_input, p_es );
727 else if( (i_id & 0xF0FF) == 0x80BD )
729 /* AC3 audio (0x80->0x8F) */
730 p_es->i_type = AC3_AUDIO_ES;
733 if( !p_input->stream.b_seekable )
734 if( main_GetIntVariable( INPUT_CHANNEL_VAR, 0 )
735 == ((p_es->i_id & 0xF00) >> 8) )
736 switch( main_GetIntVariable( INPUT_AUDIO_VAR, 0 ) )
739 main_PutIntVariable( INPUT_CHANNEL_VAR,
742 input_SelectES( p_input, p_es );
746 else if( (i_id & 0xE0FF) == 0x20BD )
748 /* Subtitles video (0x20->0x3F) */
749 p_es->i_type = DVD_SPU_ES;
751 if( main_GetIntVariable( INPUT_SUBTITLE_VAR, -1 )
752 == ((p_es->i_id & 0x1F00) >> 8) )
754 if( !p_input->stream.b_seekable )
755 input_SelectES( p_input, p_es );
759 else if( (i_id & 0xF0FF) == 0xA0BD )
761 /* LPCM audio (0xA0->0xAF) */
762 p_es->i_type = LPCM_AUDIO_ES;
764 /* FIXME : write the decoder */
768 p_es->i_type = UNKNOWN_ES;
772 } /* stream.b_is_ok */
773 vlc_mutex_unlock( &p_input->stream.stream_lock );
774 } /* i_code > 0xBC */
779 /*****************************************************************************
780 * input_DemuxPS: first step of demultiplexing: the PS header
781 *****************************************************************************/
782 void input_DemuxPS( input_thread_t * p_input, data_packet_t * p_data )
785 boolean_t b_trash = 0;
786 es_descriptor_t * p_es = NULL;
788 i_code = U32_AT( p_data->p_payload_start );
789 if( i_code <= 0x1BC )
793 case 0x1BA: /* PACK_START_CODE */
799 if( (p_data->p_payload_start[4] & 0xC0) == 0x40 )
804 p_byte = p_data->p_payload_start;
806 if( MoveChunk( p_header, &p_data, &p_byte, 14 ) != 14 )
808 intf_WarnMsg( 3, "Packet too short to have a header" );
813 ((mtime_t)(p_header[4] & 0x38) << 27) |
814 ((mtime_t)(U32_AT(p_header + 4) & 0x03FFF800)
816 ((( ((mtime_t)U16_AT(p_header + 6) << 16)
817 | (mtime_t)U16_AT(p_header + 8) ) & 0x03FFF800)
821 i_mux_rate = ((u32)U16_AT(p_header + 10) << 6)
822 | (p_header[12] >> 2);
826 /* MPEG-1 SCR is like PTS. */
829 p_byte = p_data->p_payload_start;
831 if( MoveChunk( p_header, &p_data, &p_byte, 12 ) != 12 )
833 intf_WarnMsg( 3, "Packet too short to have a header" );
838 ((mtime_t)(p_header[4] & 0x0E) << 29) |
839 (((mtime_t)U32_AT(p_header + 4) & 0xFFFE00) << 6) |
840 ((mtime_t)p_header[7] << 7) |
841 ((mtime_t)p_header[8] >> 1);
844 i_mux_rate = (U32_AT(p_header + 8) & 0x7FFFFE) >> 1;
846 /* Call the pace control. */
847 input_ClockManageRef( p_input, p_input->stream.pp_programs[0],
850 if( i_mux_rate != p_input->stream.i_mux_rate
851 && p_input->stream.i_mux_rate )
854 "Mux_rate changed - expect cosmetic errors");
856 p_input->stream.i_mux_rate = i_mux_rate;
862 case 0x1BB: /* SYSTEM_START_CODE */
863 b_trash = 1; /* Nothing interesting */
866 case 0x1BC: /* PROGRAM_STREAM_MAP_CODE */
867 DecodePSM( p_input, p_data );
871 case 0x1B9: /* PROGRAM_END_CODE */
876 /* This should not happen */
878 intf_WarnMsg( 1, "Unwanted packet received with start code %x",
884 p_es = input_ParsePS( p_input, p_data );
886 vlc_mutex_lock( &p_input->stream.control.control_lock );
887 if( p_es != NULL && p_es->p_decoder_fifo != NULL
888 && (!p_es->b_audio || !p_input->stream.control.b_mute) )
890 vlc_mutex_unlock( &p_input->stream.control.control_lock );
894 input_GatherPES( p_input, p_data, p_es, 1, 0 );
898 vlc_mutex_unlock( &p_input->stream.control.control_lock );
903 /* Trash the packet if it has no payload or if it isn't selected */
906 p_input->pf_delete_packet( p_input->p_method_data, p_data );
908 p_input->c_packets_trashed++;
918 /*****************************************************************************
919 * input_DemuxTS: first step of demultiplexing: the TS header
920 *****************************************************************************/
921 void input_DemuxTS( input_thread_t * p_input, data_packet_t * p_data )
925 boolean_t b_adaptation; /* Adaptation field is present */
926 boolean_t b_payload; /* Packet carries payload */
927 boolean_t b_unit_start; /* A PSI or a PES start in the packet */
928 boolean_t b_trash = 0; /* Is the packet unuseful ? */
929 boolean_t b_lost = 0; /* Was there a packet loss ? */
930 boolean_t b_psi = 0; /* Is this a PSI ? */
931 es_descriptor_t * p_es = NULL;
932 es_ts_data_t * p_es_demux = NULL;
933 pgrm_ts_data_t * p_pgrm_demux = NULL;
935 #define p (p_data->p_buffer)
937 /* Extract flags values from TS common header. */
938 i_pid = U16_AT(&p[1]) & 0x1fff;
939 b_unit_start = (p[1] & 0x40);
940 b_adaptation = (p[3] & 0x20);
941 b_payload = (p[3] & 0x10);
943 /* Find out the elementary stream. */
944 vlc_mutex_lock( &p_input->stream.stream_lock );
947 p_es= input_FindES( p_input, i_pid );
949 if( (p_es != NULL) && (p_es->p_demux_data != NULL) )
951 p_es_demux = (es_ts_data_t *)p_es->p_demux_data;
953 if( p_es_demux->b_psi )
957 vlc_mutex_lock( &p_input->stream.control.control_lock );
959 if( ( p_es == NULL ) || (p_es->b_audio && p_input->stream.control.b_mute) )
961 /* Not selected. Just read the adaptation field for a PCR. */
964 else if( p_es->p_decoder_fifo == NULL && !b_psi )
967 vlc_mutex_unlock( &p_input->stream.control.control_lock );
968 vlc_mutex_unlock( &p_input->stream.stream_lock );
971 if( ( p_es != NULL ) &&
972 ((p_es->p_decoder_fifo != NULL) || b_psi
973 || (p_pgrm_demux->i_pcr_pid == i_pid) ) )
975 p_es_demux = (es_ts_data_t *)p_es->p_demux_data;
977 if( ! p_es_demux->b_psi )
979 p_pgrm_demux = (pgrm_ts_data_t *)p_es->p_pgrm->p_demux_data;
986 /* Extract adaptation field information if any */
990 /* We don't have any adaptation_field, so payload starts
991 * immediately after the 4 byte TS header */
992 p_data->p_payload_start += 4;
996 /* p[4] is adaptation_field_length minus one */
997 p_data->p_payload_start += 5 + p[4];
999 /* The adaptation field can be limited to the
1000 * adaptation_field_length byte, so that there is nothing to do:
1001 * skip this possibility */
1004 /* If the packet has both adaptation_field and payload,
1005 * adaptation_field cannot be more than 182 bytes long; if
1006 * there is only an adaptation_field, it must fill the next
1008 if( b_payload ? (p[4] > 182) : (p[4] != 183) )
1011 "invalid TS adaptation field (%p)",
1013 p_data->b_discard_payload = 1;
1015 p_es->c_invalid_packets++;
1019 /* Now we are sure that the byte containing flags is present:
1023 /* discontinuity_indicator */
1027 "discontinuity_indicator"
1028 " encountered by TS demux (position read: %d,"
1030 p[5] & 0x80, p_es_demux->i_continuity_counter );
1032 /* If the PID carries the PCR, there will be a system
1033 * time-based discontinuity. We let the PCR decoder
1035 p_es->p_pgrm->i_synchro_state = SYNCHRO_REINIT;
1037 /* There also may be a continuity_counter
1038 * discontinuity: resynchronise our counter with
1039 * the one of the stream. */
1040 p_es_demux->i_continuity_counter = (p[3] & 0x0f) - 1;
1043 /* If this is a PCR_PID, and this TS packet contains a
1044 * PCR, we pass it along to the PCR decoder. */
1046 if( (p_pgrm_demux->i_pcr_pid == i_pid) && (p[5] & 0x10) )
1048 /* There should be a PCR field in the packet, check
1049 * if the adaptation field is long enough to carry
1056 ( (mtime_t)U32_AT((u32*)&p[6]) << 1 )
1058 /* Call the pace control. */
1059 input_ClockManageRef( p_input, p_es->p_pgrm,
1063 } /* valid TS adaptation field ? */
1065 } /* has adaptation field */
1066 /* Check the continuity of the stream. */
1067 i_dummy = ((p[3] & 0x0f) - p_es_demux->i_continuity_counter) & 0x0f;
1070 /* Everything is ok, just increase our counter */
1071 (p_es_demux->i_continuity_counter)++;
1075 if( !b_payload && i_dummy == 0 )
1077 /* This is a packet without payload, this is allowed by the
1078 * draft. As there is nothing interesting in this packet
1079 * (except PCR that have already been handled), we can trash
1082 "Packet without payload received by TS demux" );
1085 else if( i_dummy <= 0 )
1087 /* FIXME: this can never happen, can it ? --Meuuh */
1088 /* Duplicate packet: mark it as being to be trashed. */
1089 intf_WarnMsg( 1, "Duplicate packet received by TS demux" );
1092 else if( p_es_demux->i_continuity_counter == 0xFF )
1094 /* This means that the packet is the first one we receive for
1095 * this ES since the continuity counter ranges between 0 and
1096 * 0x0F excepts when it has been initialized by the input:
1097 * init the counter to the correct value. */
1098 intf_DbgMsg( "First packet for PID %d received by TS demux",
1100 p_es_demux->i_continuity_counter = (p[3] & 0x0f);
1104 /* This can indicate that we missed a packet or that the
1105 * continuity_counter wrapped and we received a dup packet:
1106 * as we don't know, do as if we missed a packet to be sure
1107 * to recover from this situation */
1109 "Packet lost by TS demux: current %d, packet %d",
1110 p_es_demux->i_continuity_counter & 0x0f,
1113 p_es_demux->i_continuity_counter = p[3] & 0x0f;
1114 } /* not continuous */
1116 } /* if selected or PCR */
1118 /* Trash the packet if it has no payload or if it isn't selected */
1121 p_input->pf_delete_packet( p_input->p_method_data, p_data );
1123 p_input->c_packets_trashed++;
1130 /* The payload contains PSI tables */
1131 input_DemuxPSI( p_input, p_data, p_es,
1132 b_unit_start, b_lost );
1137 /* The payload carries a PES stream */
1138 input_GatherPES( p_input, p_data, p_es, b_unit_start, b_lost );
1148 * PSI demultiplexing and decoding
1151 /*****************************************************************************
1152 * DemuxPSI : makes up complete PSI data
1153 *****************************************************************************/
1154 void input_DemuxPSI( input_thread_t * p_input, data_packet_t * p_data,
1155 es_descriptor_t * p_es, boolean_t b_unit_start, boolean_t b_lost )
1157 es_ts_data_t * p_demux_data;
1159 p_demux_data = (es_ts_data_t *)p_es->p_demux_data;
1161 #define p_psi (p_demux_data->p_psi_section)
1162 #define p (p_data->p_payload_start)
1166 /* unit_start set to 1 -> presence of a pointer field
1167 * (see ISO/IEC 13818 (2.4.4.2) which should be set to 0x00 */
1168 if( (u8)p[0] != 0x00 )
1170 /* intf_WarnMsg( 2, */
1171 intf_ErrMsg( "Non zero pointer field found. Trying to continue" );
1177 /* This is the begining of a new section */
1179 if( ((u8)(p[1]) & 0xc0) != 0x80 )
1181 intf_ErrMsg( "Invalid PSI packet" );
1186 p_psi->i_section_length = U16_AT(p+1) & 0x0fff;
1187 p_psi->b_section_complete = 0;
1188 p_psi->i_read_in_section = 0;
1189 p_psi->i_section_number = (u8)p[6];
1191 if( p_psi->b_is_complete || p_psi->i_section_number == 0 )
1193 /* This is a new PSI packet */
1194 p_psi->b_is_complete = 0;
1196 p_psi->i_version_number = ( p[5] >> 1 ) & 0x1f;
1197 p_psi->i_last_section_number = (u8)p[7];
1199 /* We'll write at the begining of the buffer */
1200 p_psi->p_current = p_psi->buffer;
1204 if( p_psi->b_section_complete )
1206 /* New Section of an already started PSI */
1207 p_psi->b_section_complete = 0;
1209 if( p_psi->i_version_number != (( p[5] >> 1 ) & 0x1f) )
1211 intf_WarnMsg( 2,"PSI version differs inside same PAT" );
1214 if( p_psi->i_section_number + 1 != (u8)p[6] )
1217 "PSI Section discontinuity. Packet lost ?");
1221 p_psi->i_section_number++;
1225 intf_WarnMsg( 2, "Received unexpected new PSI section" );
1230 } /* b_unit_start */
1232 if( !p_psi->b_trash )
1235 if( (p_data->p_payload_end - p) >=
1236 ( p_psi->i_section_length - p_psi->i_read_in_section ) )
1238 /* The end of the section is in this TS packet */
1239 memcpy( p_psi->p_current, p,
1240 (p_psi->i_section_length - p_psi->i_read_in_section) );
1242 p_psi->b_section_complete = 1;
1244 (p_psi->i_section_length - p_psi->i_read_in_section);
1246 if( p_psi->i_section_number == p_psi->i_last_section_number )
1248 /* This was the last section of PSI */
1249 p_psi->b_is_complete = 1;
1254 memcpy( p_psi->buffer, p, p_data->p_payload_end - p );
1255 p_psi->i_read_in_section+= p_data->p_payload_end - p;
1257 p_psi->p_current += p_data->p_payload_end - p;
1261 if ( p_psi->b_is_complete )
1263 switch( p_demux_data->i_psi_type)
1266 input_DecodePAT( p_input, p_es );
1269 input_DecodePMT( p_input, p_es );
1272 intf_ErrMsg("Received unknown PSI in demuxPSI");
1281 /*****************************************************************************
1282 * DecodePAT : Decodes Programm association table and deal with it
1283 *****************************************************************************/
1284 static void input_DecodePAT( input_thread_t * p_input, es_descriptor_t * p_es )
1287 stream_ts_data_t * p_stream_data;
1288 es_ts_data_t * p_demux_data;
1291 p_demux_data = (es_ts_data_t *)p_es->p_demux_data;
1292 p_stream_data = (stream_ts_data_t *)p_input->stream.p_demux_data;
1294 #define p_psi (p_demux_data->p_psi_section)
1296 if( p_stream_data->i_pat_version != p_psi->i_version_number )
1298 /* PAT has changed. We are going to delete all programms and
1299 * create new ones. We chose not to only change what was needed
1300 * as a PAT change may mean the stream is radically changing and
1301 * this is a secure method to avoid krashed */
1302 pgrm_descriptor_t * p_pgrm;
1303 es_descriptor_t * p_current_es;
1304 es_ts_data_t * p_es_demux;
1305 pgrm_ts_data_t * p_pgrm_demux;
1306 byte_t * p_current_data;
1308 int i_section_length,i_program_id,i_pmt_pid;
1309 int i_loop, i_current_section;
1311 p_current_data = p_psi->buffer;
1314 for( i_loop = 0; i_loop < p_input->stream.i_pgrm_number; i_loop++ )
1316 input_DelProgram( p_input, p_input->stream.pp_programs[i_loop] );
1321 i_section_length = U16_AT(p_current_data+1) & 0x0fff;
1322 i_current_section = (u8)p_current_data[6];
1324 for( i_loop = 0; i_loop < (i_section_length-9)/4 ; i_loop++ )
1326 i_program_id = U16_AT(p_current_data + i_loop*4 + 8);
1327 i_pmt_pid = U16_AT( p_current_data + i_loop*4 + 10) & 0x1fff;
1329 /* If program = 0, we're having info about NIT not PMT */
1332 /* Add this program */
1333 p_pgrm = input_AddProgram( p_input, i_program_id,
1334 sizeof( pgrm_ts_data_t ) );
1336 /* whatis the PID of the PMT of this program */
1337 p_pgrm_demux = (pgrm_ts_data_t *)p_pgrm->p_demux_data;
1338 p_pgrm_demux->i_pmt_version = PMT_UNINITIALIZED;
1340 /* Add the PMT ES to this program */
1341 p_current_es = input_AddES( p_input, p_pgrm,(u16)i_pmt_pid,
1342 sizeof( es_ts_data_t) );
1343 p_es_demux = (es_ts_data_t *)p_current_es->p_demux_data;
1344 p_es_demux->b_psi = 1;
1345 p_es_demux->i_psi_type = PSI_IS_PMT;
1347 p_es_demux->p_psi_section =
1348 malloc( sizeof( psi_section_t ) );
1349 p_es_demux->p_psi_section->b_is_complete = 0;
1353 p_current_data+=3+i_section_length;
1355 } while( i_current_section < p_psi->i_last_section_number );
1357 /* Go to the beginning of the next section*/
1358 p_stream_data->i_pat_version = p_psi->i_version_number;
1365 /*****************************************************************************
1366 * DecodePMT : decode a given Program Stream Map
1367 * ***************************************************************************
1368 * When the PMT changes, it may mean a deep change in the stream, and it is
1369 * careful to deletes the ES and add them again. If the PMT doesn't change,
1370 * there no need to do anything.
1371 *****************************************************************************/
1372 static void input_DecodePMT( input_thread_t * p_input, es_descriptor_t * p_es )
1375 pgrm_ts_data_t * p_pgrm_data;
1376 es_ts_data_t * p_demux_data;
1378 p_demux_data = (es_ts_data_t *)p_es->p_demux_data;
1379 p_pgrm_data = (pgrm_ts_data_t *)p_es->p_pgrm->p_demux_data;
1381 #define p_psi (p_demux_data->p_psi_section)
1383 if( p_psi->i_version_number != p_pgrm_data->i_pmt_version )
1385 es_descriptor_t * p_new_es;
1386 es_ts_data_t * p_es_demux;
1387 byte_t * p_current_data, * p_current_section;
1388 int i_section_length,i_current_section;
1389 int i_prog_info_length, i_loop;
1390 int i_es_info_length, i_pid, i_stream_type;
1392 p_current_section = p_psi->buffer;
1393 p_current_data = p_psi->buffer;
1395 p_pgrm_data->i_pcr_pid = U16_AT(p_current_section + 8) & 0x1fff;
1397 /* Delete all ES in this program except the PSI */
1398 for( i_loop=0; i_loop < p_es->p_pgrm->i_es_number; i_loop++ )
1400 p_es_demux = (es_ts_data_t *)
1401 p_es->p_pgrm->pp_es[i_loop]->p_demux_data;
1402 if ( ! p_es_demux->b_psi )
1403 input_DelES( p_input, p_es->p_pgrm->pp_es[i_loop] );
1406 /* Then add what we received in this PMT */
1410 i_section_length = U16_AT(p_current_data+1) & 0x0fff;
1411 i_current_section = (u8)p_current_data[6];
1412 i_prog_info_length = U16_AT(p_current_data+10) & 0x0fff;
1414 /* For the moment we ignore program descriptors */
1415 p_current_data += 12+i_prog_info_length;
1417 /* The end of the section, before the CRC is at
1418 * p_current_section + i_section_length -1 */
1419 while( p_current_data < p_current_section + i_section_length -1 )
1421 i_stream_type = (int)p_current_data[0];
1422 i_pid = U16_AT( p_current_data + 1 ) & 0x1fff;
1423 i_es_info_length = U16_AT( p_current_data + 3 ) & 0x0fff;
1425 /* Add this ES to the program */
1426 p_new_es = input_AddES( p_input, p_es->p_pgrm,
1427 (u16)i_pid, sizeof( es_ts_data_t ) );
1428 p_new_es->i_type = i_stream_type;
1430 /* We want to decode */
1431 input_SelectES( p_input, p_new_es );
1433 p_current_data += 5 + i_es_info_length;
1436 /* Go to the beginning of the next section*/
1437 p_current_data += 3+i_section_length;
1439 p_current_section+=1;
1441 } while( i_current_section < p_psi->i_last_section_number );
1443 p_pgrm_data->i_pmt_version = p_psi->i_version_number;