1 /*****************************************************************************
2 * mpeg_system.c: TS, PS and PES management
3 *****************************************************************************
4 * Copyright (C) 1998-2001 VideoLAN
5 * $Id: mpeg_system.c,v 1.76 2001/12/19 10:00:00 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 */
42 #include "stream_control.h"
43 #include "input_ext-intf.h"
44 #include "input_ext-dec.h"
45 #include "input_ext-plugins.h"
47 /*****************************************************************************
49 *****************************************************************************/
51 static void input_DecodePAT( input_thread_t *, es_descriptor_t *);
52 static void input_DecodePMT( input_thread_t *, es_descriptor_t *);
55 * PES Packet management
58 /*****************************************************************************
60 *****************************************************************************
61 * Small utility function used to parse discontinuous headers safely. Copies
62 * i_buf_len bytes of data to a buffer and returns the size copied.
63 * It also solves some alignment problems on non-IA-32, non-PPC processors.
64 * This is a variation on the theme of input_ext-dec.h:GetChunk().
65 *****************************************************************************/
66 static __inline__ size_t MoveChunk( byte_t * p_dest,
67 data_packet_t ** pp_data_src,
71 ptrdiff_t i_available;
73 if( (i_available = (*pp_data_src)->p_payload_end - *pp_src)
77 memcpy( p_dest, *pp_src, i_buf_len );
83 size_t i_init_len = i_buf_len;
88 memcpy( p_dest, *pp_src, i_available );
89 *pp_data_src = (*pp_data_src)->p_next;
90 i_buf_len -= i_available;
91 p_dest += i_available;
92 if( *pp_data_src == NULL )
95 return( i_init_len - i_buf_len );
97 *pp_src = (*pp_data_src)->p_payload_start;
99 while( (i_available = (*pp_data_src)->p_payload_end - *pp_src)
105 memcpy( p_dest, *pp_src, i_buf_len );
106 *pp_src += i_buf_len;
108 return( i_init_len );
112 /*****************************************************************************
114 *****************************************************************************
115 * Parse a finished PES packet and analyze its header.
116 *****************************************************************************/
117 #define PES_HEADER_SIZE 7
118 void input_ParsePES( input_thread_t * p_input, es_descriptor_t * p_es )
120 data_packet_t * p_data;
122 byte_t p_header[PES_HEADER_SIZE];
125 #define p_pes (p_es->p_pes)
127 //intf_DbgMsg("End of PES packet %p", p_pes);
129 /* Parse the header. The header has a variable length, but in order
130 * to improve the algorithm, we will read the 14 bytes we may be
132 p_data = p_pes->p_first;
133 p_byte = p_data->p_payload_start;
136 if( MoveChunk( p_header, &p_data, &p_byte, PES_HEADER_SIZE )
139 intf_WarnMsg( 1, "input: PES packet too short to have a header" );
140 p_input->pf_delete_pes( p_input->p_method_data, p_pes );
145 /* Get the PES size if defined */
146 p_es->i_pes_real_size = U16_AT(p_header + 4);
147 if( p_es->i_pes_real_size )
149 p_es->i_pes_real_size += 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( "input error: data loss, "
158 "PES packet doesn't start with 0x000001" );
159 p_input->pf_delete_pes( p_input->p_method_data, p_pes );
164 int i_pes_header_size, i_payload_size;
166 if ( p_es->i_pes_real_size &&
167 (p_es->i_pes_real_size != p_pes->i_pes_size) )
169 /* PES_packet_length is set and != total received payload */
170 /* Warn the decoder that the data may be corrupt. */
171 intf_WarnMsg( 1, "input: packet corrupted, "
172 "PES sizes do not match" );
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( "input error: 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 )
293 intf_WarnMsg( 1, "input: PES packet too short "
294 "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 )
313 intf_WarnMsg( 1, "input: PES packet too short "
314 "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 )
331 intf_WarnMsg( 1, "input: PES packet too short "
332 "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( "input error: 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( "input error: 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( "input error: no fifo to receive PES %p "
401 "(who wrote this damn code ?)", p_pes );
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( "input error: 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_pes->p_last->p_next = p_data;
482 p_pes->p_last = p_data;
485 /* Size of the payload carried in the data packet */
486 p_pes->i_pes_size += (p_data->p_payload_end
487 - p_data->p_payload_start);
489 /* We can check if the packet is finished */
490 if( p_pes->i_pes_size == p_es->i_pes_real_size )
492 /* The packet is finished, parse it */
493 input_ParsePES( p_input, p_es );
504 /*****************************************************************************
505 * GetID: Get the ID of a stream
506 *****************************************************************************/
507 static u16 GetID( data_packet_t * p_data )
511 i_id = p_data->p_demux_start[3]; /* stream_id */
514 /* FIXME : this is not valid if the header is split in multiple
516 /* stream_private_id */
517 i_id |= p_data->p_demux_start[ 9 + p_data->p_demux_start[8] ] << 8;
522 /*****************************************************************************
523 * DecodePSM: Decode the Program Stream Map information
524 *****************************************************************************
525 * FIXME : loads are not aligned in this function
526 *****************************************************************************/
527 static void DecodePSM( input_thread_t * p_input, data_packet_t * p_data )
529 stream_ps_data_t * p_demux =
530 (stream_ps_data_t *)p_input->stream.p_demux_data;
534 int i_new_es_number = 0;
536 if( p_data->p_demux_start + 10 > p_data->p_payload_end )
538 intf_ErrMsg( "input error: PSM too short : packet corrupt" );
542 if( p_demux->b_has_PSM
543 && p_demux->i_PSM_version == (p_data->p_demux_start[6] & 0x1F) )
545 /* Already got that one. */
549 intf_DbgMsg( "input: building PSM" );
550 p_demux->b_has_PSM = 1;
551 p_demux->i_PSM_version = p_data->p_demux_start[6] & 0x1F;
553 /* Go to elementary_stream_map_length, jumping over
554 * program_stream_info. */
555 p_byte = p_data->p_demux_start + 10
556 + U16_AT(&p_data->p_demux_start[8]);
557 if( p_byte > p_data->p_payload_end )
559 intf_ErrMsg( "input error: PSM too short, packet corrupt" );
562 /* This is the full size of the elementary_stream_map.
563 * 2 == elementary_stream_map_length
564 * Please note that CRC_32 is not included in the length. */
565 p_end = p_byte + 2 + U16_AT(p_byte);
567 if( p_end > p_data->p_payload_end )
569 intf_ErrMsg( "input error: PSM too short, packet corrupt" );
573 vlc_mutex_lock( &p_input->stream.stream_lock );
575 /* 4 == minimum useful size of a section */
576 while( p_byte + 4 <= p_end )
578 es_descriptor_t * p_es = NULL;
579 u8 i_stream_id = p_byte[1];
580 /* FIXME: there will be a problem with private streams... (same
583 /* Look for the ES in the ES table */
584 for( i = i_new_es_number;
585 i < p_input->stream.pp_programs[0]->i_es_number;
588 if( p_input->stream.pp_programs[0]->pp_es[i]->i_stream_id
591 p_es = p_input->stream.pp_programs[0]->pp_es[i];
592 if( p_es->i_type != p_byte[0] )
594 input_DelES( p_input, p_es );
599 /* Move the ES to the beginning. */
600 p_input->stream.pp_programs[0]->pp_es[i]
601 = p_input->stream.pp_programs[0]->pp_es[ i_new_es_number ];
602 p_input->stream.pp_programs[0]->pp_es[ i_new_es_number ]
610 /* The goal is to have all the ES we have just read in the
611 * beginning of the pp_es table, and all the others at the end,
612 * so that we can close them more easily at the end. */
615 p_es = input_AddES( p_input, p_input->stream.pp_programs[0],
617 p_es->i_type = p_byte[0];
618 p_es->b_audio = ( p_es->i_type == MPEG1_AUDIO_ES
619 || p_es->i_type == MPEG2_AUDIO_ES
620 || p_es->i_type == AC3_AUDIO_ES
621 || p_es->i_type == LPCM_AUDIO_ES
624 /* input_AddES has inserted the new element at the end. */
625 p_input->stream.pp_programs[0]->pp_es[
626 p_input->stream.pp_programs[0]->i_es_number ]
627 = p_input->stream.pp_programs[0]->pp_es[ i_new_es_number ];
628 p_input->stream.pp_programs[0]->pp_es[ i_new_es_number ] = p_es;
631 p_byte += 4 + U16_AT(&p_byte[2]);
634 /* Un-select the streams that are no longer parts of the program. */
635 while( i_new_es_number < p_input->stream.pp_programs[0]->i_es_number )
637 /* We remove pp_es[i_new_es_member] and not pp_es[i] because the
638 * list will be emptied starting from the end */
639 input_DelES( p_input,
640 p_input->stream.pp_programs[0]->pp_es[i_new_es_number] );
643 if( p_main->b_stats )
645 intf_StatMsg( "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_demux_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_demux_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 /* Tell the interface the stream has changed */
782 p_input->stream.b_changed = 1;
784 } /* stream.b_is_ok */
785 vlc_mutex_unlock( &p_input->stream.stream_lock );
786 } /* i_code > 0xBC */
791 /*****************************************************************************
792 * input_DemuxPS: first step of demultiplexing: the PS header
793 *****************************************************************************/
794 void input_DemuxPS( input_thread_t * p_input, data_packet_t * p_data )
797 boolean_t b_trash = 0;
798 es_descriptor_t * p_es = NULL;
800 i_code = ((u32)p_data->p_demux_start[0] << 24)
801 | ((u32)p_data->p_demux_start[1] << 16)
802 | ((u32)p_data->p_demux_start[2] << 8)
803 | p_data->p_demux_start[3];
804 if( i_code <= 0x1BC )
808 case 0x1BA: /* PACK_START_CODE */
814 if( (p_data->p_demux_start[4] & 0xC0) == 0x40 )
819 p_byte = p_data->p_demux_start;
821 if( MoveChunk( p_header, &p_data, &p_byte, 14 ) != 14 )
823 intf_WarnMsg( 1, "input: packet too short "
824 "to have a header" );
829 ((mtime_t)(p_header[4] & 0x38) << 27) |
830 ((mtime_t)(U32_AT(p_header + 4) & 0x03FFF800)
832 ((( ((mtime_t)U16_AT(p_header + 6) << 16)
833 | (mtime_t)U16_AT(p_header + 8) ) & 0x03FFF800)
837 i_mux_rate = ((u32)U16_AT(p_header + 10) << 6)
838 | (p_header[12] >> 2);
839 /* FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
840 * This is the biggest kludge ever !
841 * I don't know what's wrong with mux_rate calculation
842 * but this heuristic work well : */
848 /* MPEG-1 SCR is like PTS. */
851 p_byte = p_data->p_demux_start;
853 if( MoveChunk( p_header, &p_data, &p_byte, 12 ) != 12 )
855 intf_WarnMsg( 1, "input: packet too short "
856 "to have a header" );
861 ((mtime_t)(p_header[4] & 0x0E) << 29) |
862 (((mtime_t)U32_AT(p_header + 4) & 0xFFFE00) << 6) |
863 ((mtime_t)p_header[7] << 7) |
864 ((mtime_t)p_header[8] >> 1);
867 i_mux_rate = (U32_AT(p_header + 8) & 0x7FFFFE) >> 1;
869 /* Call the pace control. */
870 input_ClockManageRef( p_input, p_input->stream.pp_programs[0],
873 if( i_mux_rate != p_input->stream.i_mux_rate
874 && p_input->stream.i_mux_rate )
876 intf_WarnMsg( 2, "input: mux_rate changed, "
877 "expect cosmetic errors" );
879 p_input->stream.i_mux_rate = i_mux_rate;
885 case 0x1BB: /* SYSTEM_START_CODE */
886 b_trash = 1; /* Nothing interesting */
889 case 0x1BC: /* PROGRAM_STREAM_MAP_CODE */
890 DecodePSM( p_input, p_data );
894 case 0x1B9: /* PROGRAM_END_CODE */
899 /* This should not happen */
901 intf_WarnMsg( 3, "input: unwanted packet received "
902 "with start code 0x%.8x", i_code );
907 p_es = input_ParsePS( p_input, p_data );
909 vlc_mutex_lock( &p_input->stream.control.control_lock );
910 if( p_es != NULL && p_es->p_decoder_fifo != NULL
911 && (!p_es->b_audio || !p_input->stream.control.b_mute) )
913 vlc_mutex_unlock( &p_input->stream.control.control_lock );
915 input_GatherPES( p_input, p_data, p_es, 1, 0 );
919 vlc_mutex_unlock( &p_input->stream.control.control_lock );
924 /* Trash the packet if it has no payload or if it isn't selected */
927 p_input->pf_delete_packet( p_input->p_method_data, p_data );
928 p_input->stream.c_packets_trashed++;
937 /*****************************************************************************
938 * input_DemuxTS: first step of demultiplexing: the TS header
939 *****************************************************************************/
940 void input_DemuxTS( input_thread_t * p_input, data_packet_t * p_data )
944 boolean_t b_adaptation; /* Adaptation field is present */
945 boolean_t b_payload; /* Packet carries payload */
946 boolean_t b_unit_start; /* A PSI or a PES start in the packet */
947 boolean_t b_trash = 0; /* Is the packet unuseful ? */
948 boolean_t b_lost = 0; /* Was there a packet loss ? */
949 boolean_t b_psi = 0; /* Is this a PSI ? */
950 es_descriptor_t * p_es = NULL;
951 es_ts_data_t * p_es_demux = NULL;
952 pgrm_ts_data_t * p_pgrm_demux = NULL;
954 #define p (p_data->p_demux_start)
955 /* Extract flags values from TS common header. */
956 i_pid = ((p[1] & 0x1F) << 8) | p[2];
957 b_unit_start = (p[1] & 0x40);
958 b_adaptation = (p[3] & 0x20);
959 b_payload = (p[3] & 0x10);
961 /* Find out the elementary stream. */
962 vlc_mutex_lock( &p_input->stream.stream_lock );
964 p_es= input_FindES( p_input, i_pid );
966 if( (p_es != NULL) && (p_es->p_demux_data != NULL) )
968 p_es_demux = (es_ts_data_t *)p_es->p_demux_data;
970 if( p_es_demux->b_psi )
976 p_pgrm_demux = (pgrm_ts_data_t *)p_es->p_pgrm->p_demux_data;
980 vlc_mutex_lock( &p_input->stream.control.control_lock );
981 if( ( p_es == NULL ) || (p_es->b_audio && p_input->stream.control.b_mute) )
983 /* Not selected. Just read the adaptation field for a PCR. */
986 else if( p_es->p_decoder_fifo == NULL && !b_psi )
991 vlc_mutex_unlock( &p_input->stream.control.control_lock );
992 vlc_mutex_unlock( &p_input->stream.stream_lock );
995 /* Don't change the order of the tests : if b_psi then p_pgrm_demux
996 * may still be null. Who said it was ugly ?
997 * I have written worse. --Meuuh */
998 if( ( p_es != NULL ) &&
999 ((p_es->p_decoder_fifo != NULL) || b_psi
1000 || (p_pgrm_demux->i_pcr_pid == i_pid) ) )
1004 /* Extract adaptation field information if any */
1008 /* We don't have any adaptation_field, so payload starts
1009 * immediately after the 4 byte TS header */
1010 p_data->p_payload_start += 4;
1014 /* p[4] is adaptation_field_length minus one */
1015 p_data->p_payload_start += 5 + p[4];
1017 /* The adaptation field can be limited to the
1018 * adaptation_field_length byte, so that there is nothing to do:
1019 * skip this possibility */
1022 /* If the packet has both adaptation_field and payload,
1023 * adaptation_field cannot be more than 182 bytes long; if
1024 * there is only an adaptation_field, it must fill the next
1026 if( b_payload ? (p[4] > 182) : (p[4] != 183) )
1029 "input: invalid TS adaptation field (%p)",
1031 p_data->b_discard_payload = 1;
1032 p_es->c_invalid_packets++;
1035 /* Now we are sure that the byte containing flags is present:
1039 /* discontinuity_indicator */
1043 "input: discontinuity_indicator"
1044 " encountered by TS demux (position read: %d,"
1046 p[5] & 0x80, p_es_demux->i_continuity_counter );
1048 /* If the PID carries the PCR, there will be a system
1049 * time-based discontinuity. We let the PCR decoder
1051 p_es->p_pgrm->i_synchro_state = SYNCHRO_REINIT;
1053 /* There also may be a continuity_counter
1054 * discontinuity: resynchronize our counter with
1055 * the one of the stream. */
1056 p_es_demux->i_continuity_counter = (p[3] & 0x0f) - 1;
1059 /* If this is a PCR_PID, and this TS packet contains a
1060 * PCR, we pass it along to the PCR decoder. */
1062 if( !b_psi && (p_pgrm_demux->i_pcr_pid == i_pid)
1065 /* There should be a PCR field in the packet, check
1066 * if the adaptation field is long enough to carry
1072 pcr_time = ( (mtime_t)p[6] << 25 ) |
1073 ( (mtime_t)p[7] << 17 ) |
1074 ( (mtime_t)p[8] << 9 ) |
1075 ( (mtime_t)p[9] << 1 ) |
1076 ( (mtime_t)p[10] >> 7 );
1077 /* Call the pace control. */
1078 input_ClockManageRef( p_input, p_es->p_pgrm,
1082 } /* valid TS adaptation field ? */
1084 } /* has adaptation field */
1085 /* Check the continuity of the stream. */
1086 i_dummy = ((p[3] & 0x0f) - p_es_demux->i_continuity_counter) & 0x0f;
1089 /* Everything is ok, just increase our counter */
1090 (p_es_demux->i_continuity_counter)++;
1094 if( !b_payload && i_dummy == 0 )
1096 /* This is a packet without payload, this is allowed by the
1097 * draft. As there is nothing interesting in this packet
1098 * (except PCR that have already been handled), we can trash
1100 intf_WarnMsg( 3, "input: packet without payload received "
1104 else if( i_dummy <= 0 )
1106 /* Duplicate packet: mark it as being to be trashed. */
1107 intf_WarnMsg( 3, "input: duplicate packet received "
1111 else if( p_es_demux->i_continuity_counter == 0xFF )
1113 /* This means that the packet is the first one we receive for
1114 * this ES since the continuity counter ranges between 0 and
1115 * 0x0F excepts when it has been initialized by the input:
1116 * init the counter to the correct value. */
1117 intf_WarnMsg( 3, "input: first packet for PID %d received "
1118 "by TS demux", p_es->i_id );
1119 p_es_demux->i_continuity_counter = (p[3] & 0x0f);
1123 /* This can indicate that we missed a packet or that the
1124 * continuity_counter wrapped and we received a dup packet:
1125 * as we don't know, do as if we missed a packet to be sure
1126 * to recover from this situation */
1127 intf_WarnMsg( 2, "input: packet lost by TS demux: "
1128 "current %d, packet %d",
1129 p_es_demux->i_continuity_counter & 0x0f,
1132 p_es_demux->i_continuity_counter = p[3] & 0x0f;
1133 } /* not continuous */
1135 } /* if selected or PCR */
1137 /* Trash the packet if it has no payload or if it isn't selected */
1140 p_input->pf_delete_packet( p_input->p_method_data, p_data );
1141 p_input->stream.c_packets_trashed++;
1147 /* The payload contains PSI tables */
1148 input_DemuxPSI( p_input, p_data, p_es,
1149 b_unit_start, b_lost );
1154 /* The payload carries a PES stream */
1155 input_GatherPES( p_input, p_data, p_es, b_unit_start, b_lost );
1165 * PSI demultiplexing and decoding
1168 /*****************************************************************************
1169 * DemuxPSI : makes up complete PSI data
1170 *****************************************************************************/
1171 void input_DemuxPSI( input_thread_t * p_input, data_packet_t * p_data,
1172 es_descriptor_t * p_es, boolean_t b_unit_start, boolean_t b_lost )
1174 es_ts_data_t * p_demux_data;
1176 p_demux_data = (es_ts_data_t *)p_es->p_demux_data;
1178 #define p_psi (p_demux_data->p_psi_section)
1179 #define p (p_data->p_payload_start)
1183 /* unit_start set to 1 -> presence of a pointer field
1184 * (see ISO/IEC 13818 (2.4.4.2) which should be set to 0x00 */
1185 if( (u8)p[0] != 0x00 )
1187 intf_WarnMsg( 2, "input: non zero pointer field found, "
1188 "trying to continue" );
1196 /* This is the begining of a new section */
1198 if( ((u8)(p[1]) & 0xc0) != 0x80 )
1200 intf_WarnMsg( 2, "input: invalid PSI packet" );
1205 p_psi->i_section_length = ((p[1] & 0xF) << 8) | p[2];
1206 p_psi->b_section_complete = 0;
1207 p_psi->i_read_in_section = 0;
1208 p_psi->i_section_number = (u8)p[6];
1210 if( p_psi->b_is_complete || p_psi->i_section_number == 0 )
1212 /* This is a new PSI packet */
1213 p_psi->b_is_complete = 0;
1215 p_psi->i_version_number = ( p[5] >> 1 ) & 0x1f;
1216 p_psi->i_last_section_number = (u8)p[7];
1218 /* We'll write at the begining of the buffer */
1219 p_psi->p_current = p_psi->buffer;
1223 if( p_psi->b_section_complete )
1225 /* New Section of an already started PSI */
1226 p_psi->b_section_complete = 0;
1228 if( p_psi->i_version_number != (( p[5] >> 1 ) & 0x1f) )
1230 intf_WarnMsg( 2, "input: PSI version differs "
1231 "inside same PAT" );
1234 if( p_psi->i_section_number + 1 != (u8)p[6] )
1236 intf_WarnMsg( 2, "input: PSI Section discontinuity, "
1241 p_psi->i_section_number++;
1245 intf_WarnMsg( 2, "input: got unexpected new PSI section" );
1250 } /* b_unit_start */
1252 if( !p_psi->b_trash )
1255 if( (p_data->p_payload_end - p) >=
1256 ( p_psi->i_section_length - p_psi->i_read_in_section ) )
1258 /* The end of the section is in this TS packet */
1259 memcpy( p_psi->p_current, p,
1260 (p_psi->i_section_length - p_psi->i_read_in_section) );
1262 p_psi->b_section_complete = 1;
1264 (p_psi->i_section_length - p_psi->i_read_in_section);
1266 if( p_psi->i_section_number == p_psi->i_last_section_number )
1268 /* This was the last section of PSI */
1269 p_psi->b_is_complete = 1;
1271 switch( p_demux_data->i_psi_type)
1274 input_DecodePAT( p_input, p_es );
1277 input_DecodePMT( p_input, p_es );
1280 intf_WarnMsg(2, "Received unknown PSI in DemuxPSI");
1286 memcpy( p_psi->buffer, p, p_data->p_payload_end - p );
1287 p_psi->i_read_in_section += p_data->p_payload_end - p;
1289 p_psi->p_current += p_data->p_payload_end - p;
1296 p_input->pf_delete_packet( p_input->p_method_data, p_data );
1301 /*****************************************************************************
1302 * DecodePAT : Decodes Programm association table and deal with it
1303 *****************************************************************************/
1304 static void input_DecodePAT( input_thread_t * p_input, es_descriptor_t * p_es )
1306 stream_ts_data_t * p_stream_data;
1307 es_ts_data_t * p_demux_data;
1309 pgrm_descriptor_t * p_pgrm;
1310 es_descriptor_t * p_current_es;
1311 byte_t * p_current_data;
1313 int i_section_length, i_program_id, i_pmt_pid;
1314 int i_loop, i_current_section;
1316 boolean_t b_changed = 0;
1318 p_demux_data = (es_ts_data_t *)p_es->p_demux_data;
1319 p_stream_data = (stream_ts_data_t *)p_input->stream.p_demux_data;
1321 #define p_psi (p_demux_data->p_psi_section)
1323 /* Not so fast, Mike ! If the PAT version has changed, we first check
1324 * that its content has really changed before doing anything */
1325 if( p_stream_data->i_pat_version != p_psi->i_version_number )
1327 int i_programs = p_input->stream.i_pgrm_number;
1329 p_current_data = p_psi->buffer;
1333 i_section_length = ((u32)(p_current_data[1] & 0xF) << 8) |
1335 i_current_section = (u8)p_current_data[6];
1338 ( i_loop < (i_section_length - 9) / 4 ) && !b_changed;
1341 i_program_id = ( (u32)*(p_current_data + i_loop * 4 + 8) << 8 )
1342 | *(p_current_data + i_loop * 4 + 9);
1343 i_pmt_pid = ( ((u32)*(p_current_data + i_loop * 4 + 10) & 0x1F)
1345 | *(p_current_data + i_loop * 4 + 11);
1349 if( (p_pgrm = input_FindProgram( p_input, i_program_id ))
1350 && (p_current_es = input_FindES( p_input, i_pmt_pid ))
1351 && p_current_es->p_pgrm == p_pgrm
1352 && p_current_es->i_id == i_pmt_pid
1353 && ((es_ts_data_t *)p_current_es->p_demux_data)->b_psi
1354 && ((es_ts_data_t *)p_current_es->p_demux_data)
1355 ->i_psi_type == PSI_IS_PMT )
1366 p_current_data += 3 + i_section_length;
1368 } while( ( i_current_section < p_psi->i_last_section_number )
1371 /* If we didn't find the expected amount of programs, the PAT has
1372 * changed. Otherwise, it only changed if b_changed is already != 0 */
1373 b_changed = b_changed || i_programs;
1378 /* PAT has changed. We are going to delete all programs and
1379 * create new ones. We chose not to only change what was needed
1380 * as a PAT change may mean the stream is radically changing and
1381 * this is a secure method to avoid crashes */
1382 es_ts_data_t * p_es_demux;
1383 pgrm_ts_data_t * p_pgrm_demux;
1385 p_current_data = p_psi->buffer;
1387 /* Delete all programs */
1388 while( p_input->stream.i_pgrm_number )
1390 input_DelProgram( p_input, p_input->stream.pp_programs[0] );
1395 i_section_length = ((u32)(p_current_data[1] & 0xF) << 8) |
1397 i_current_section = (u8)p_current_data[6];
1399 for( i_loop = 0; i_loop < (i_section_length - 9) / 4 ; i_loop++ )
1401 i_program_id = ( (u32)*(p_current_data + i_loop * 4 + 8) << 8 )
1402 | *(p_current_data + i_loop * 4 + 9);
1403 i_pmt_pid = ( ((u32)*(p_current_data + i_loop * 4 + 10) & 0x1F)
1405 | *(p_current_data + i_loop * 4 + 11);
1407 /* If program = 0, we're having info about NIT not PMT */
1410 /* Add this program */
1411 p_pgrm = input_AddProgram( p_input, i_program_id,
1412 sizeof( pgrm_ts_data_t ) );
1414 /* whatis the PID of the PMT of this program */
1415 p_pgrm_demux = (pgrm_ts_data_t *)p_pgrm->p_demux_data;
1416 p_pgrm_demux->i_pmt_version = PMT_UNINITIALIZED;
1418 /* Add the PMT ES to this program */
1419 p_current_es = input_AddES( p_input, p_pgrm,(u16)i_pmt_pid,
1420 sizeof( es_ts_data_t) );
1421 p_es_demux = (es_ts_data_t *)p_current_es->p_demux_data;
1422 p_es_demux->b_psi = 1;
1423 p_es_demux->i_psi_type = PSI_IS_PMT;
1425 p_es_demux->p_psi_section =
1426 malloc( sizeof( psi_section_t ) );
1427 p_es_demux->p_psi_section->b_is_complete = 0;
1431 p_current_data += 3 + i_section_length;
1433 } while( i_current_section < p_psi->i_last_section_number );
1435 /* Go to the beginning of the next section */
1436 p_stream_data->i_pat_version = p_psi->i_version_number;
1441 /* FIXME This has nothing to do here */
1442 p_input->stream.p_selected_program = p_input->stream.pp_programs[0] ;
1445 /*****************************************************************************
1446 * DecodePMT : decode a given Program Stream Map
1447 * ***************************************************************************
1448 * When the PMT changes, it may mean a deep change in the stream, and it is
1449 * careful to delete the ES and add them again. If the PMT doesn't change,
1450 * there no need to do anything.
1451 *****************************************************************************/
1452 static void input_DecodePMT( input_thread_t * p_input, es_descriptor_t * p_es )
1455 pgrm_ts_data_t * p_pgrm_data;
1456 es_ts_data_t * p_demux_data;
1458 p_demux_data = (es_ts_data_t *)p_es->p_demux_data;
1459 p_pgrm_data = (pgrm_ts_data_t *)p_es->p_pgrm->p_demux_data;
1461 #define p_psi (p_demux_data->p_psi_section)
1463 if( p_psi->i_version_number != p_pgrm_data->i_pmt_version )
1465 es_descriptor_t * p_new_es;
1466 es_ts_data_t * p_es_demux;
1467 byte_t * p_current_data, * p_current_section;
1468 int i_section_length,i_current_section;
1469 int i_prog_info_length, i_loop;
1470 int i_es_info_length, i_pid, i_stream_type;
1471 int i_audio_es, i_spu_es;
1472 int i_required_audio_es, i_required_spu_es;
1474 p_current_section = p_psi->buffer;
1475 p_current_data = p_psi->buffer;
1477 p_pgrm_data->i_pcr_pid = ( ((u32)*(p_current_section + 8) & 0x1F) << 8 ) |
1478 *(p_current_section + 9);
1483 /* Lock stream information */
1484 vlc_mutex_lock( &p_input->stream.stream_lock );
1486 /* Get the number of the required audio stream */
1487 if( p_main->b_audio )
1489 /* Default is the first one */
1490 i_required_audio_es = main_GetIntVariable( INPUT_CHANNEL_VAR, 1 );
1491 if( i_required_audio_es < 0 )
1493 main_PutIntVariable( INPUT_CHANNEL_VAR, 1 );
1494 i_required_audio_es = 1;
1499 i_required_audio_es = 0;
1502 /* Same thing for subtitles */
1503 if( p_main->b_video )
1505 /* for spu, default is none */
1506 i_required_spu_es = main_GetIntVariable( INPUT_SUBTITLE_VAR, 0 );
1507 if( i_required_spu_es < 0 )
1509 main_PutIntVariable( INPUT_SUBTITLE_VAR, 0 );
1510 i_required_spu_es = 0;
1515 i_required_spu_es = 0;
1518 /* Delete all ES in this program except the PSI. We start from the
1519 * end because i_es_number gets decremented after each deletion. */
1520 for( i_loop = p_es->p_pgrm->i_es_number ; i_loop ; )
1523 p_es_demux = (es_ts_data_t *)
1524 p_es->p_pgrm->pp_es[i_loop]->p_demux_data;
1525 if ( ! p_es_demux->b_psi )
1527 input_DelES( p_input, p_es->p_pgrm->pp_es[i_loop] );
1531 /* Then add what we received in this PMT */
1534 i_section_length = ( ((u32)*(p_current_data + 1) & 0xF) << 8 ) |
1535 *(p_current_data + 2);
1536 i_current_section = (u8)p_current_data[6];
1537 i_prog_info_length = ( ((u32)*(p_current_data + 10) & 0xF) << 8 ) |
1538 *(p_current_data + 11);
1540 /* For the moment we ignore program descriptors */
1541 p_current_data += 12 + i_prog_info_length;
1543 /* The end of the section, before the CRC is at
1544 * p_current_section + i_section_length -1 */
1545 while( p_current_data < p_current_section + i_section_length -1 )
1547 i_stream_type = (int)p_current_data[0];
1548 i_pid = ( ((u32)*(p_current_data + 1) & 0x1F) << 8 ) |
1549 *(p_current_data + 2);
1550 i_es_info_length = ( ((u32)*(p_current_data + 3) & 0xF) << 8 ) |
1551 *(p_current_data + 4);
1553 /* Add this ES to the program */
1554 p_new_es = input_AddES( p_input, p_es->p_pgrm,
1555 (u16)i_pid, sizeof( es_ts_data_t ) );
1557 /* Tell the decoders what kind of stream it is */
1558 p_new_es->i_type = i_stream_type;
1560 /* Tell the interface what kind of stream it is and select
1561 * the required ones */
1562 switch( i_stream_type )
1564 case MPEG1_VIDEO_ES:
1565 case MPEG2_VIDEO_ES:
1566 p_new_es->i_cat = VIDEO_ES;
1567 input_SelectES( p_input, p_new_es );
1569 case MPEG1_AUDIO_ES:
1570 case MPEG2_AUDIO_ES:
1571 p_new_es->i_cat = AUDIO_ES;
1573 if( i_audio_es == i_required_audio_es )
1574 input_SelectES( p_input, p_new_es );
1576 case LPCM_AUDIO_ES :
1578 p_new_es->i_stream_id = 0xBD;
1579 p_new_es->i_cat = AUDIO_ES;
1581 if( i_audio_es == i_required_audio_es )
1582 input_SelectES( p_input, p_new_es );
1584 /* Not sure this one is fully specification-compliant */
1586 p_new_es->i_stream_id = 0xBD;
1587 p_new_es->i_cat = SPU_ES;
1589 if( i_spu_es == i_required_spu_es )
1590 input_SelectES( p_input, p_new_es );
1593 p_new_es->i_cat = UNKNOWN_ES;
1597 p_current_data += 5 + i_es_info_length;
1600 /* Go to the beginning of the next section*/
1601 p_current_data += 3 + i_section_length;
1603 p_current_section++;
1605 } while( i_current_section < p_psi->i_last_section_number );
1607 if( i_required_audio_es > i_audio_es )
1609 intf_WarnMsg( 2, "input: non-existing audio ES required" );
1612 if( i_required_spu_es > i_spu_es )
1614 intf_WarnMsg( 2, "input: non-existing subtitles ES required" );
1617 p_pgrm_data->i_pmt_version = p_psi->i_version_number;
1619 /* inform interface that stream has changed */
1620 p_input->stream.b_changed = 1;
1622 vlc_mutex_unlock( &p_input->stream.stream_lock );