1 /*****************************************************************************
2 * mpeg_system.c: TS, PS and PES management
3 *****************************************************************************
4 * Copyright (C) 1998-2001 VideoLAN
5 * $Id: mpeg_system.c,v 1.97.2.3 2002/09/26 22:43:45 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 *****************************************************************************/
32 #include <string.h> /* memcpy(), memset() */
33 #include <sys/types.h> /* off_t */
35 #include <videolan/vlc.h>
37 #include "stream_control.h"
38 #include "input_ext-intf.h"
39 #include "input_ext-dec.h"
40 #include "input_ext-plugins.h"
43 * PES Packet management
46 /*****************************************************************************
48 *****************************************************************************
49 * Small utility function used to parse discontinuous headers safely. Copies
50 * i_buf_len bytes of data to a buffer and returns the size copied.
51 * It also solves some alignment problems on non-IA-32, non-PPC processors.
52 * This is a variation on the theme of input_ext-dec.h:GetChunk().
53 *****************************************************************************/
54 static inline size_t MoveChunk( byte_t * p_dest, data_packet_t ** pp_data_src,
55 byte_t ** pp_src, size_t i_buf_len )
57 ptrdiff_t i_available;
59 if( (i_available = (*pp_data_src)->p_payload_end - *pp_src)
63 memcpy( p_dest, *pp_src, i_buf_len );
69 size_t i_init_len = i_buf_len;
74 memcpy( p_dest, *pp_src, i_available );
75 *pp_data_src = (*pp_data_src)->p_next;
76 i_buf_len -= i_available;
77 p_dest += i_available;
78 if( *pp_data_src == NULL )
81 return( i_init_len - i_buf_len );
83 *pp_src = (*pp_data_src)->p_payload_start;
85 while( (i_available = (*pp_data_src)->p_payload_end - *pp_src)
91 memcpy( p_dest, *pp_src, i_buf_len );
98 /*****************************************************************************
100 *****************************************************************************
101 * Parse a finished PES packet and analyze its header.
102 *****************************************************************************/
103 #define PES_HEADER_SIZE 7
104 void input_ParsePES( input_thread_t * p_input, es_descriptor_t * p_es )
106 data_packet_t * p_data;
108 byte_t p_header[PES_HEADER_SIZE];
111 #define p_pes (p_es->p_pes)
113 /* Parse the header. The header has a variable length, but in order
114 * to improve the algorithm, we will read the 14 bytes we may be
116 p_data = p_pes->p_first;
117 p_byte = p_data->p_payload_start;
120 if( MoveChunk( p_header, &p_data, &p_byte, PES_HEADER_SIZE )
123 intf_WarnMsg( 1, "input: PES packet too short to have a header" );
124 input_DeletePES( p_input->p_method_data, p_pes );
129 /* Get the PES size if defined */
130 p_es->i_pes_real_size = U16_AT(p_header + 4);
131 if( p_es->i_pes_real_size )
133 p_es->i_pes_real_size += 6;
136 /* First read the 6 header bytes common to all PES packets:
137 * use them to test the PES validity */
138 if( (p_header[0] || p_header[1] || (p_header[2] != 1)) )
140 /* packet_start_code_prefix != 0x000001 */
141 intf_ErrMsg( "input error: data loss, "
142 "PES packet doesn't start with 0x000001" );
143 input_DeletePES( p_input->p_method_data, p_pes );
148 int i_pes_header_size, i_payload_size;
150 if ( p_es->i_pes_real_size &&
151 (p_es->i_pes_real_size != p_pes->i_pes_size) )
153 /* PES_packet_length is set and != total received payload */
154 /* Warn the decoder that the data may be corrupt. */
155 intf_WarnMsg( 1, "input: packet corrupted, "
156 "PES sizes do not match" );
159 switch( p_es->i_stream_id )
161 case 0xBC: /* Program stream map */
162 case 0xBE: /* Padding */
163 case 0xBF: /* Private stream 2 */
166 case 0xFF: /* Program stream directory */
167 case 0xF2: /* DSMCC stream */
168 case 0xF8: /* ITU-T H.222.1 type E stream */
169 /* The payload begins immediately after the 6 bytes header, so
170 * we have finished with the parsing */
171 i_pes_header_size = 6;
175 if( (p_header[6] & 0xC0) == 0x80 )
177 /* MPEG-2 : the PES header contains at least 3 more bytes. */
179 boolean_t b_has_pts, b_has_dts;
180 byte_t p_full_header[12];
182 p_pes->b_data_alignment = p_header[6] & 0x04;
184 i_max_len = MoveChunk( p_full_header, &p_data, &p_byte, 12 );
188 "PES packet too short to have a MPEG-2 header" );
189 input_DeletePES( p_input->p_method_data,
195 b_has_pts = p_full_header[0] & 0x80;
196 b_has_dts = p_full_header[0] & 0x40;
197 i_pes_header_size = p_full_header[1] + 9;
199 /* Now parse the optional header extensions */
205 "PES packet too short to have a MPEG-2 header" );
206 input_DeletePES( p_input->p_method_data,
211 p_pes->i_pts = input_ClockGetTS( p_input, p_es->p_pgrm,
212 ( ((mtime_t)(p_full_header[2] & 0x0E) << 29) |
213 ((mtime_t)(p_full_header[3]) << 22) |
214 ((mtime_t)(p_full_header[4] & 0xFE) << 14) |
215 ((mtime_t)p_full_header[5] << 7) |
216 ((mtime_t)p_full_header[6] >> 1) ) );
223 "PES packet too short to have a MPEG-2 header" );
224 input_DeletePES( p_input->p_method_data,
229 p_pes->i_dts = input_ClockGetTS( p_input, p_es->p_pgrm,
230 ( ((mtime_t)(p_full_header[7] & 0x0E) << 29) |
231 (((mtime_t)U16_AT(p_full_header + 8) << 14)
233 ((mtime_t)U16_AT(p_full_header + 10) >> 1) ) );
239 /* Probably MPEG-1 */
240 boolean_t b_has_pts, b_has_dts;
242 i_pes_header_size = 6;
243 p_data = p_pes->p_first;
244 p_byte = p_data->p_payload_start;
245 /* Cannot fail because the previous one succeeded. */
246 MoveChunk( NULL, &p_data, &p_byte, 6 );
248 while( *p_byte == 0xFF && i_pes_header_size < 23 )
251 if( MoveChunk( NULL, &p_data, &p_byte, 1 ) != 1 )
254 "PES packet too short to have a MPEG-1 header" );
255 input_DeletePES( p_input->p_method_data, p_pes );
260 if( i_pes_header_size == 23 )
262 intf_ErrMsg( "input error: too much MPEG-1 stuffing" );
263 input_DeletePES( p_input->p_method_data, p_pes );
268 if( (*p_byte & 0xC0) == 0x40 )
270 /* Don't ask why... --Meuuh */
271 /* Erm... why ? --Sam */
272 /* Well... According to the recommendation, it is for
273 * STD_buffer_scale and STD_buffer_size. --Meuuh */
274 i_pes_header_size += 2;
275 if( MoveChunk( NULL, &p_data, &p_byte, 2 ) != 2 )
277 intf_WarnMsg( 1, "input: PES packet too short "
278 "to have a MPEG-1 header" );
279 input_DeletePES( p_input->p_method_data, p_pes );
287 b_has_pts = *p_byte & 0x20;
288 b_has_dts = *p_byte & 0x10;
294 i_pes_header_size += 4;
295 if( MoveChunk( p_ts, &p_data, &p_byte, 5 ) != 5 )
297 intf_WarnMsg( 1, "input: PES packet too short "
298 "to have a MPEG-1 header" );
299 input_DeletePES( p_input->p_method_data, p_pes );
304 p_pes->i_pts = input_ClockGetTS( p_input, p_es->p_pgrm,
305 ( ((mtime_t)(p_ts[0] & 0x0E) << 29) |
306 (((mtime_t)U32_AT(p_ts) & 0xFFFE00) << 6) |
307 ((mtime_t)p_ts[3] << 7) |
308 ((mtime_t)p_ts[4] >> 1) ) );
312 i_pes_header_size += 5;
313 if( MoveChunk( p_ts, &p_data, &p_byte, 5 ) != 5 )
315 intf_WarnMsg( 1, "input: PES packet too short "
316 "to have a MPEG-1 header" );
317 input_DeletePES( p_input->p_method_data,
323 p_pes->i_dts = input_ClockGetTS( p_input,
325 ( ((mtime_t)(p_ts[0] & 0x0E) << 29) |
326 (((mtime_t)U32_AT(p_ts) & 0xFFFE00) << 6) |
327 ((mtime_t)p_ts[3] << 7) |
328 ((mtime_t)p_ts[4] >> 1) ) );
336 if ( p_es->i_type == A52B_AUDIO_ES
337 || p_es->i_type == AC3_AUDIO_ES )
339 /* With A/52 audio, we need to skip the first 3 bytes */
340 i_pes_header_size += 3;
343 if( p_es->i_type == A52B_AUDIO_ES
344 || p_es->i_type == LPCMB_AUDIO_ES
345 || p_es->i_type == DVDB_SPU_ES )
347 /* stream_private_id */
348 i_pes_header_size += 1;
351 /* Now we've parsed the header, we just have to indicate in some
352 * specific data packets where the PES payload begins (renumber
353 * p_payload_start), so that the decoders can find the beginning
354 * of their data right out of the box. */
355 p_data = p_pes->p_first;
356 i_payload_size = p_data->p_payload_end
357 - p_data->p_payload_start;
358 while( i_pes_header_size > i_payload_size )
360 /* These packets are entirely filled by the PES header. */
361 i_pes_header_size -= i_payload_size;
362 p_data->p_payload_start = p_data->p_payload_end;
363 /* Go to the next data packet. */
364 if( (p_data = p_data->p_next) == NULL )
366 intf_ErrMsg( "input error: PES header bigger than payload" );
367 input_DeletePES( p_input->p_method_data, p_pes );
371 i_payload_size = p_data->p_payload_end
372 - p_data->p_payload_start;
374 /* This last packet is partly header, partly payload. */
375 if( i_payload_size < i_pes_header_size )
377 intf_ErrMsg( "input error: PES header bigger than payload" );
378 input_DeletePES( p_input->p_method_data, p_pes );
382 p_data->p_payload_start += i_pes_header_size;
385 /* Now we can eventually put the PES packet in the decoder's
387 if( p_es->p_decoder_fifo != NULL )
389 input_DecodePES( p_es->p_decoder_fifo, p_pes );
393 intf_ErrMsg( "input error: no fifo to receive PES %p "
394 "(who wrote this damn code ?)", p_pes );
395 input_DeletePES( p_input->p_method_data, p_pes );
403 /*****************************************************************************
405 *****************************************************************************
406 * Gather a PES packet.
407 *****************************************************************************/
408 void input_GatherPES( input_thread_t * p_input, data_packet_t * p_data,
409 es_descriptor_t * p_es,
410 boolean_t b_unit_start, boolean_t b_packet_lost )
412 #define p_pes (p_es->p_pes)
414 /* If we lost data, insert a NULL data packet (philosophy : 0 is quite
415 * often an escape sequence in decoders, so that should make them wait
416 * for the next start code). */
419 input_NullPacket( p_input, p_es );
422 if( b_unit_start && p_pes != NULL )
424 /* If the data packet contains the begining of a new PES packet, and
425 * if we were reassembling a PES packet, then the PES should be
426 * complete now, so parse its header and give it to the decoders. */
427 input_ParsePES( p_input, p_es );
430 if( !b_unit_start && p_pes == NULL )
432 /* Random access... */
433 input_DeletePacket( p_input->p_method_data, p_data );
439 /* If we are at the beginning of a new PES packet, we must fetch
440 * a new PES buffer to begin with the reassembly of this PES
441 * packet. This is also here that we can synchronize with the
442 * stream if we lost packets or if the decoder has just
444 if( (p_pes = input_NewPES( p_input->p_method_data ) ) == NULL )
446 intf_ErrMsg( "input error: out of memory" );
447 p_input->b_error = 1;
450 p_pes->i_rate = p_input->stream.control.i_rate;
451 p_pes->p_first = p_data;
453 /* If the PES header fits in the first data packet, we can
454 * already set p_gather->i_pes_real_size. */
455 if( p_data->p_payload_end - p_data->p_payload_start
458 p_es->i_pes_real_size = ((u16)p_data->p_payload_start[4] << 8)
459 + p_data->p_payload_start[5] + 6;
463 p_es->i_pes_real_size = 0;
468 /* Update the relations between the data packets */
469 p_pes->p_last->p_next = p_data;
472 p_pes->p_last = p_data;
475 /* Size of the payload carried in the data packet */
476 p_pes->i_pes_size += (p_data->p_payload_end
477 - p_data->p_payload_start);
479 /* We can check if the packet is finished */
480 if( p_pes->i_pes_size == p_es->i_pes_real_size )
482 /* The packet is finished, parse it */
483 input_ParsePES( p_input, p_es );
494 /*****************************************************************************
495 * GetID: Get the ID of a stream
496 *****************************************************************************/
497 static u16 GetID( data_packet_t * p_data )
501 i_id = p_data->p_demux_start[3]; /* stream_id */
504 /* FIXME : this is not valid if the header is split in multiple
506 /* stream_private_id */
507 i_id |= p_data->p_demux_start[ 9 + p_data->p_demux_start[8] ] << 8;
512 /*****************************************************************************
513 * DecodePSM: Decode the Program Stream Map information
514 *****************************************************************************
515 * FIXME : loads are not aligned in this function
516 *****************************************************************************/
517 static void DecodePSM( input_thread_t * p_input, data_packet_t * p_data )
519 stream_ps_data_t * p_demux =
520 (stream_ps_data_t *)p_input->stream.p_demux_data;
524 int i_new_es_number = 0;
526 if( p_data->p_demux_start + 10 > p_data->p_payload_end )
528 intf_ErrMsg( "input error: PSM too short : packet corrupt" );
532 if( p_demux->b_has_PSM
533 && p_demux->i_PSM_version == (p_data->p_demux_start[6] & 0x1F) )
535 /* Already got that one. */
539 p_demux->b_has_PSM = 1;
540 p_demux->i_PSM_version = p_data->p_demux_start[6] & 0x1F;
542 /* Go to elementary_stream_map_length, jumping over
543 * program_stream_info. */
544 p_byte = p_data->p_demux_start + 10
545 + U16_AT(&p_data->p_demux_start[8]);
546 if( p_byte > p_data->p_payload_end )
548 intf_ErrMsg( "input error: PSM too short, packet corrupt" );
551 /* This is the full size of the elementary_stream_map.
552 * 2 == elementary_stream_map_length
553 * Please note that CRC_32 is not included in the length. */
554 p_end = p_byte + 2 + U16_AT(p_byte);
556 if( p_end > p_data->p_payload_end )
558 intf_ErrMsg( "input error: PSM too short, packet corrupt" );
562 vlc_mutex_lock( &p_input->stream.stream_lock );
564 /* 4 == minimum useful size of a section */
565 while( p_byte + 4 <= p_end )
567 es_descriptor_t * p_es = NULL;
568 u8 i_stream_id = p_byte[1];
569 /* FIXME: there will be a problem with private streams... (same
572 /* Look for the ES in the ES table */
573 for( i = i_new_es_number;
574 i < p_input->stream.pp_programs[0]->i_es_number;
577 if( p_input->stream.pp_programs[0]->pp_es[i]->i_stream_id
580 p_es = p_input->stream.pp_programs[0]->pp_es[i];
581 if( p_es->i_type != p_byte[0] )
583 input_DelES( p_input, p_es );
588 /* Move the ES to the beginning. */
589 p_input->stream.pp_programs[0]->pp_es[i]
590 = p_input->stream.pp_programs[0]->pp_es[ i_new_es_number ];
591 p_input->stream.pp_programs[0]->pp_es[ i_new_es_number ]
599 /* The goal is to have all the ES we have just read in the
600 * beginning of the pp_es table, and all the others at the end,
601 * so that we can close them more easily at the end. */
604 p_es = input_AddES( p_input, p_input->stream.pp_programs[0],
606 p_es->i_type = p_byte[0];
607 p_es->b_audio = ( p_es->i_type == MPEG1_AUDIO_ES
608 || p_es->i_type == MPEG2_AUDIO_ES
609 || p_es->i_type == AC3_AUDIO_ES
610 || p_es->i_type == A52B_AUDIO_ES
611 || p_es->i_type == LPCM_AUDIO_ES
612 || p_es->i_type == LPCMB_AUDIO_ES
615 /* input_AddES has inserted the new element at the end. */
616 p_input->stream.pp_programs[0]->pp_es[
617 p_input->stream.pp_programs[0]->i_es_number ]
618 = p_input->stream.pp_programs[0]->pp_es[ i_new_es_number ];
619 p_input->stream.pp_programs[0]->pp_es[ i_new_es_number ] = p_es;
622 p_byte += 4 + U16_AT(&p_byte[2]);
625 /* Un-select the streams that are no longer parts of the program. */
626 while( i_new_es_number < p_input->stream.pp_programs[0]->i_es_number )
628 /* We remove pp_es[i_new_es_member] and not pp_es[i] because the
629 * list will be emptied starting from the end */
630 input_DelES( p_input,
631 p_input->stream.pp_programs[0]->pp_es[i_new_es_number] );
634 if( p_main->b_stats )
636 intf_StatMsg( "input info: The stream map after the PSM is now :" );
637 input_DumpStream( p_input );
640 vlc_mutex_unlock( &p_input->stream.stream_lock );
643 /*****************************************************************************
644 * input_ReadPS: store a PS packet into a data_buffer_t
645 *****************************************************************************/
646 #define PEEK( SIZE ) \
647 i_error = input_Peek( p_input, &p_peek, SIZE ); \
648 if( i_error == -1 ) \
652 else if( i_error < SIZE ) \
658 ssize_t input_ReadPS( input_thread_t * p_input, data_packet_t ** pp_data )
661 size_t i_packet_size;
662 ssize_t i_error, i_read;
664 /* Read what we believe to be a packet header. */
667 if( p_peek[0] || p_peek[1] || p_peek[2] != 1 || p_peek[3] < 0xB9 )
669 if( p_peek[0] || p_peek[1] || p_peek[2] )
671 /* It is common for MPEG-1 streams to pad with zeros
672 * (although it is forbidden by the recommendation), so
673 * don't bother everybody in this case. */
674 intf_WarnMsg( 3, "input warning: garbage (0x%.2x%.2x%.2x%.2x)",
675 p_peek[0], p_peek[1], p_peek[2], p_peek[3] );
678 /* This is not the startcode of a packet. Read the stream
679 * until we find one. */
680 while( p_peek[0] || p_peek[1] || p_peek[2] != 1 || p_peek[3] < 0xB9 )
682 p_input->p_current_data++;
684 if( p_input->b_die ) return( -1 );
689 /* 0x1B9 == SYSTEM_END_CODE, it is only 4 bytes long. */
690 if( p_peek[3] != 0xB9 )
692 /* The packet is at least 6 bytes long. */
695 if( p_peek[3] != 0xBA )
697 /* That's the case for all packets, except pack header. */
698 i_packet_size = (p_peek[4] << 8) | p_peek[5];
703 if( (p_peek[4] & 0xC0) == 0x40 )
708 else if( (p_peek[4] & 0xF0) == 0x20 )
715 intf_ErrMsg( "Unable to determine stream type" );
722 /* System End Code */
726 /* Fetch a packet of the appropriate size. */
727 i_read = input_SplitBuffer( p_input, pp_data, i_packet_size + 6 );
733 /* In MPEG-2 pack headers we still have to read stuffing bytes. */
734 if( ((*pp_data)->p_demux_start[3] == 0xBA) && (i_packet_size == 8) )
736 size_t i_stuffing = ((*pp_data)->p_demux_start[13] & 0x7);
737 /* Force refill of the input buffer - though we don't care
738 * about p_peek. Please note that this is unoptimized. */
740 p_input->p_current_data += i_stuffing;
748 /*****************************************************************************
749 * input_ParsePS: read the PS header
750 *****************************************************************************/
751 es_descriptor_t * input_ParsePS( input_thread_t * p_input,
752 data_packet_t * p_data )
755 es_descriptor_t * p_es = NULL;
757 i_code = p_data->p_demux_start[3];
759 if( i_code > 0xBC ) /* ES start code */
764 /* This is a PES packet. Find out if we want it or not. */
765 i_id = GetID( p_data );
767 vlc_mutex_lock( &p_input->stream.stream_lock );
768 if( p_input->stream.pp_programs[0]->b_is_ok )
770 /* Look only at the selected ES. */
771 for( i_dummy = 0; i_dummy < p_input->stream.i_selected_es_number;
774 if( p_input->stream.pp_selected_es[i_dummy] != NULL
775 && p_input->stream.pp_selected_es[i_dummy]->i_id == i_id )
777 p_es = p_input->stream.pp_selected_es[i_dummy];
784 stream_ps_data_t * p_demux =
785 (stream_ps_data_t *)p_input->stream.pp_programs[0]->p_demux_data;
787 /* Search all ES ; if not found -> AddES */
788 p_es = input_FindES( p_input, i_id );
790 if( p_es == NULL && !p_demux->b_has_PSM )
792 p_es = input_AddES( p_input, p_input->stream.pp_programs[0],
796 p_es->i_stream_id = p_data->p_demux_start[3];
798 /* Set stream type and auto-spawn. */
799 if( (i_id & 0xF0) == 0xE0 )
802 p_es->i_type = MPEG2_VIDEO_ES;
803 p_es->i_cat = VIDEO_ES;
805 if( !p_input->stream.b_seekable )
806 input_SelectES( p_input, p_es );
809 else if( (i_id & 0xE0) == 0xC0 )
812 p_es->i_type = MPEG2_AUDIO_ES;
814 p_es->i_cat = AUDIO_ES;
816 if( !p_input->stream.b_seekable )
817 if( config_GetIntVariable( "audio-channel" )
818 == (p_es->i_id & 0x1F) ||
819 ( config_GetIntVariable( "audio-channel" ) < 0
820 && !(p_es->i_id & 0x1F) ) )
821 switch( config_GetIntVariable( "audio-type" ) )
825 input_SelectES( p_input, p_es );
829 else if( (i_id & 0xF0FF) == 0x80BD )
831 /* AC3 audio (0x80->0x8F) */
832 p_es->i_type = A52B_AUDIO_ES;
834 p_es->i_cat = AUDIO_ES;
836 if( !p_input->stream.b_seekable )
837 if( config_GetIntVariable( "audio-channel" )
838 == ((p_es->i_id & 0xF00) >> 8) ||
839 ( config_GetIntVariable( "audio-channel" ) < 0
840 && !((p_es->i_id & 0xF00) >> 8)) )
841 switch( config_GetIntVariable( "audio-type" ) )
845 input_SelectES( p_input, p_es );
849 else if( (i_id & 0xE0FF) == 0x20BD )
851 /* Subtitles video (0x20->0x3F) */
852 p_es->i_type = DVDB_SPU_ES;
853 p_es->i_cat = SPU_ES;
855 if( config_GetIntVariable( "spu-channel" )
856 == ((p_es->i_id & 0x1F00) >> 8) )
858 if( !p_input->stream.b_seekable )
859 input_SelectES( p_input, p_es );
863 else if( (i_id & 0xF0FF) == 0xA0BD )
865 /* LPCM audio (0xA0->0xAF) */
866 p_es->i_type = LPCMB_AUDIO_ES;
868 p_es->i_cat = AUDIO_ES;
872 p_es->i_type = UNKNOWN_ES;
876 /* Tell the interface the stream has changed */
877 p_input->stream.b_changed = 1;
879 } /* stream.b_is_ok */
880 vlc_mutex_unlock( &p_input->stream.stream_lock );
881 } /* i_code > 0xBC */
886 /*****************************************************************************
887 * input_DemuxPS: first step of demultiplexing: the PS header
888 *****************************************************************************/
889 void input_DemuxPS( input_thread_t * p_input, data_packet_t * p_data )
892 boolean_t b_trash = 0;
893 es_descriptor_t * p_es = NULL;
895 i_code = ((u32)p_data->p_demux_start[0] << 24)
896 | ((u32)p_data->p_demux_start[1] << 16)
897 | ((u32)p_data->p_demux_start[2] << 8)
898 | p_data->p_demux_start[3];
899 if( i_code <= 0x1BC )
903 case 0x1BA: /* PACK_START_CODE */
909 if( (p_data->p_demux_start[4] & 0xC0) == 0x40 )
914 p_byte = p_data->p_demux_start;
916 if( MoveChunk( p_header, &p_data, &p_byte, 14 ) != 14 )
918 intf_WarnMsg( 1, "input: packet too short "
919 "to have a header" );
924 ((mtime_t)(p_header[4] & 0x38) << 27) |
925 ((mtime_t)(U32_AT(p_header + 4) & 0x03FFF800)
927 ((( ((mtime_t)U16_AT(p_header + 6) << 16)
928 | (mtime_t)U16_AT(p_header + 8) ) & 0x03FFF800)
932 i_mux_rate = ((u32)U16_AT(p_header + 10) << 6)
933 | (p_header[12] >> 2);
934 /* FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
935 * This is the biggest kludge ever !
936 * I don't know what's wrong with mux_rate calculation
937 * but this heuristic work well : */
943 /* MPEG-1 SCR is like PTS. */
946 p_byte = p_data->p_demux_start;
948 if( MoveChunk( p_header, &p_data, &p_byte, 12 ) != 12 )
950 intf_WarnMsg( 1, "input: packet too short "
951 "to have a header" );
956 ((mtime_t)(p_header[4] & 0x0E) << 29) |
957 (((mtime_t)U32_AT(p_header + 4) & 0xFFFE00) << 6) |
958 ((mtime_t)p_header[7] << 7) |
959 ((mtime_t)p_header[8] >> 1);
962 i_mux_rate = (U32_AT(p_header + 8) & 0x7FFFFE) >> 1;
964 /* Call the pace control. */
965 input_ClockManageRef( p_input,
966 p_input->stream.p_selected_program,
969 if( i_mux_rate != p_input->stream.i_mux_rate
970 && p_input->stream.i_mux_rate )
972 intf_WarnMsg( 2, "input: mux_rate changed, "
973 "expect cosmetic errors" );
975 p_input->stream.i_mux_rate = i_mux_rate;
981 case 0x1BB: /* SYSTEM_START_CODE */
982 b_trash = 1; /* Nothing interesting */
985 case 0x1BC: /* PROGRAM_STREAM_MAP_CODE */
986 DecodePSM( p_input, p_data );
990 case 0x1B9: /* PROGRAM_END_CODE */
995 /* This should not happen */
997 intf_WarnMsg( 3, "input: unwanted packet received "
998 "with start code 0x%.8x", i_code );
1003 p_es = input_ParsePS( p_input, p_data );
1005 vlc_mutex_lock( &p_input->stream.control.control_lock );
1006 if( p_es != NULL && p_es->p_decoder_fifo != NULL
1007 && (!p_es->b_audio || !p_input->stream.control.b_mute) )
1009 vlc_mutex_unlock( &p_input->stream.control.control_lock );
1011 input_GatherPES( p_input, p_data, p_es, 1, 0 );
1015 vlc_mutex_unlock( &p_input->stream.control.control_lock );
1020 /* Trash the packet if it has no payload or if it isn't selected */
1023 input_DeletePacket( p_input->p_method_data, p_data );
1024 p_input->stream.c_packets_trashed++;
1033 /*****************************************************************************
1034 * input_ReadTS: store a TS packet into a data_buffer_t
1035 *****************************************************************************/
1036 #define PEEK( SIZE ) \
1037 i_error = input_Peek( p_input, &p_peek, SIZE ); \
1038 if( i_error == -1 ) \
1042 else if( i_error < SIZE ) \
1048 ssize_t input_ReadTS( input_thread_t * p_input, data_packet_t ** pp_data )
1051 ssize_t i_error, i_read;
1055 if( *p_peek != TS_SYNC_CODE )
1057 intf_WarnMsg( 3, "input warning: garbage at input (%x)", *p_peek );
1059 if( p_input->i_mtu )
1061 while( *p_peek != TS_SYNC_CODE )
1063 /* Try to resync on next packet. */
1064 PEEK( TS_PACKET_SIZE );
1065 p_input->p_current_data += TS_PACKET_SIZE;
1071 /* Move forward until we find 0x47 (and hope it's the good
1073 while( *p_peek != TS_SYNC_CODE )
1075 p_input->p_current_data++;
1081 i_read = input_SplitBuffer( p_input, pp_data, TS_PACKET_SIZE );
1090 /*****************************************************************************
1091 * input_DemuxTS: first step of demultiplexing: the TS header
1092 *****************************************************************************/
1093 void input_DemuxTS( input_thread_t * p_input, data_packet_t * p_data,
1094 psi_callback_t pf_psi_callback )
1098 boolean_t b_adaptation; /* Adaptation field is present */
1099 boolean_t b_payload; /* Packet carries payload */
1100 boolean_t b_unit_start; /* A PSI or a PES start in the packet */
1101 boolean_t b_trash = 0; /* Is the packet unuseful ? */
1102 boolean_t b_lost = 0; /* Was there a packet loss ? */
1103 boolean_t b_psi = 0; /* Is this a PSI ? */
1104 boolean_t b_pcr = 0; /* Does it have a PCR ? */
1105 es_descriptor_t * p_es = NULL;
1106 es_ts_data_t * p_es_demux = NULL;
1107 pgrm_ts_data_t * p_pgrm_demux = NULL;
1109 #define p (p_data->p_demux_start)
1110 /* Extract flags values from TS common header. */
1111 i_pid = ((p[1] & 0x1F) << 8) | p[2];
1112 b_unit_start = (p[1] & 0x40);
1113 b_adaptation = (p[3] & 0x20);
1114 b_payload = (p[3] & 0x10);
1116 /* Find out the elementary stream. */
1117 vlc_mutex_lock( &p_input->stream.stream_lock );
1119 for( i_dummy = 0; i_dummy < p_input->stream.i_pgrm_number; i_dummy ++ )
1121 if( (( pgrm_ts_data_t * ) p_input->stream.pp_programs[i_dummy]->
1122 p_demux_data)->i_pcr_pid == i_pid )
1129 p_es= input_FindES( p_input, i_pid );
1131 if( (p_es != NULL) && (p_es->p_demux_data != NULL) )
1133 p_es_demux = (es_ts_data_t *)p_es->p_demux_data;
1135 if( p_es_demux->b_psi )
1141 p_pgrm_demux = (pgrm_ts_data_t *)p_es->p_pgrm->p_demux_data;
1145 vlc_mutex_lock( &p_input->stream.control.control_lock );
1146 if( ( p_es == NULL ) || (p_es->b_audio && p_input->stream.control.b_mute) )
1148 /* Not selected. Just read the adaptation field for a PCR. */
1151 else if( p_es->p_decoder_fifo == NULL && !b_psi )
1156 vlc_mutex_unlock( &p_input->stream.control.control_lock );
1157 vlc_mutex_unlock( &p_input->stream.stream_lock );
1160 /* Don't change the order of the tests : if b_psi then p_pgrm_demux
1161 * may still be null. Who said it was ugly ?
1162 * I have written worse. --Meuuh */
1164 ((p_es->p_decoder_fifo != NULL) || b_psi || b_pcr ) )
1168 /* Extract adaptation field information if any */
1172 /* We don't have any adaptation_field, so payload starts
1173 * immediately after the 4 byte TS header */
1174 p_data->p_payload_start += 4;
1178 /* p[4] is adaptation_field_length minus one */
1179 p_data->p_payload_start += 5 + p[4];
1181 /* The adaptation field can be limited to the
1182 * adaptation_field_length byte, so that there is nothing to do:
1183 * skip this possibility */
1186 /* If the packet has both adaptation_field and payload,
1187 * adaptation_field cannot be more than 182 bytes long; if
1188 * there is only an adaptation_field, it must fill the next
1190 if( b_payload ? (p[4] > 182) : (p[4] != 183) )
1193 "input: invalid TS adaptation field (%p)",
1195 p_data->b_discard_payload = 1;
1196 p_es->c_invalid_packets++;
1199 /* Now we are sure that the byte containing flags is present:
1203 /* discontinuity_indicator */
1207 "input: discontinuity_indicator"
1208 " encountered by TS demux (position read: %d,"
1210 p[5] & 0x80, p_es_demux->i_continuity_counter );
1212 /* If the PID carries the PCR, there will be a system
1213 * time-based discontinuity. We let the PCR decoder
1215 p_es->p_pgrm->i_synchro_state = SYNCHRO_REINIT;
1217 /* There also may be a continuity_counter
1218 * discontinuity: resynchronize our counter with
1219 * the one of the stream. */
1220 p_es_demux->i_continuity_counter = (p[3] & 0x0f) - 1;
1223 } /* valid TS adaptation field ? */
1225 } /* has adaptation field */
1226 /* Check the continuity of the stream. */
1227 i_dummy = ((p[3] & 0x0f) - p_es_demux->i_continuity_counter) & 0x0f;
1230 /* Everything is ok, just increase our counter */
1231 (p_es_demux->i_continuity_counter)++;
1235 if( !b_payload && i_dummy == 0 )
1237 /* This is a packet without payload, this is allowed by the
1238 * draft. As there is nothing interesting in this packet
1239 * (except PCR that have already been handled), we can trash
1243 else if( i_dummy <= 0 )
1245 /* Duplicate packet: mark it as being to be trashed. */
1246 intf_WarnMsg( 3, "input: duplicate packet received "
1250 else if( p_es_demux->i_continuity_counter == 0xFF )
1252 /* This means that the packet is the first one we receive for
1253 * this ES since the continuity counter ranges between 0 and
1254 * 0x0F excepts when it has been initialized by the input:
1255 * init the counter to the correct value. */
1256 intf_WarnMsg( 3, "input: first packet for PID %d received "
1257 "by TS demux", p_es->i_id );
1258 p_es_demux->i_continuity_counter = (p[3] & 0x0f);
1262 /* This can indicate that we missed a packet or that the
1263 * continuity_counter wrapped and we received a dup packet:
1264 * as we don't know, do as if we missed a packet to be sure
1265 * to recover from this situation */
1266 intf_WarnMsg( 2, "input: packet lost by TS demux: "
1267 "current %d, packet %d",
1268 p_es_demux->i_continuity_counter & 0x0f,
1271 p_es_demux->i_continuity_counter = p[3] & 0x0f;
1272 } /* not continuous */
1274 } /* if selected or PCR */
1277 if( b_pcr && b_adaptation && (p[5] & 0x10) && p[4]>=7 )
1281 pcr_time = ( (mtime_t)p[6] << 25 ) |
1282 ( (mtime_t)p[7] << 17 ) |
1283 ( (mtime_t)p[8] << 9 ) |
1284 ( (mtime_t)p[9] << 1 ) |
1285 ( (mtime_t)p[10] >> 7 );
1286 /* Call the pace control. */
1287 for( i_dummy = 0; i_dummy < p_input->stream.i_pgrm_number;
1290 if( ( ( pgrm_ts_data_t * ) p_input->stream.pp_programs[i_dummy]->
1291 p_demux_data )->i_pcr_pid == i_pid )
1293 input_ClockManageRef( p_input,
1294 p_input->stream.pp_programs[i_dummy], pcr_time );
1300 /* Trash the packet if it has no payload or if it isn't selected */
1303 input_DeletePacket( p_input->p_method_data, p_data );
1304 p_input->stream.c_packets_trashed++;
1310 /* The payload contains PSI tables */
1311 (* pf_psi_callback) ( p_input, p_data, p_es, b_unit_start );
1315 /* The payload carries a PES stream */
1316 input_GatherPES( p_input, p_data, p_es, b_unit_start, b_lost );