1 /*****************************************************************************
2 * mpeg_system.c: TS, PS and PES management
3 *****************************************************************************
4 * Copyright (C) 1998, 1999, 2000 VideoLAN
5 * $Id: mpeg_system.c,v 1.27 2001/01/24 19:05:55 massiot Exp $
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
38 #include "stream_control.h"
39 #include "input_ext-intf.h"
40 #include "input_ext-dec.h"
43 #include "mpeg_system.h"
45 #include "main.h" /* AC3/MPEG channel, SPU channel */
47 /*****************************************************************************
49 *****************************************************************************/
53 * PES Packet management
56 /*****************************************************************************
58 *****************************************************************************
59 * Small utility function used to parse discontinuous headers safely. Copies
60 * i_buf_len bytes of data to a buffer and returns the size copied.
61 * This is a variation on the theme of input_ext-dec.h:GetChunk().
62 *****************************************************************************/
63 static __inline__ size_t MoveChunk( byte_t * p_dest,
64 data_packet_t ** pp_data_src,
68 ptrdiff_t i_available;
70 if( (i_available = (*pp_data_src)->p_payload_end - *pp_src)
74 memcpy( p_dest, *pp_src, i_buf_len );
80 size_t i_init_len = i_buf_len;
85 memcpy( p_dest, *pp_src, i_available );
86 *pp_data_src = (*pp_data_src)->p_next;
87 i_buf_len -= i_available;
88 p_dest += i_available;
89 if( *pp_data_src == NULL )
92 return( i_init_len - i_buf_len );
94 *pp_src = (*pp_data_src)->p_payload_start;
96 while( (i_available = (*pp_data_src)->p_payload_end - *pp_src)
102 memcpy( p_dest, *pp_src, i_buf_len );
103 *pp_src += i_buf_len;
105 return( i_init_len );
109 /*****************************************************************************
111 *****************************************************************************
112 * Parse a finished PES packet and analyze its header.
113 *****************************************************************************/
114 #define PES_HEADER_SIZE 7
115 void input_ParsePES( input_thread_t * p_input, es_descriptor_t * p_es )
117 data_packet_t * p_data;
119 byte_t p_header[PES_HEADER_SIZE];
122 #define p_pes (p_es->p_pes)
124 //intf_DbgMsg("End of PES packet %p", p_pes);
126 /* Parse the header. The header has a variable length, but in order
127 * to improve the algorithm, we will read the 14 bytes we may be
129 p_data = p_pes->p_first;
130 p_byte = p_data->p_payload_start;
133 if( MoveChunk( p_header, &p_data, &p_byte, PES_HEADER_SIZE )
136 intf_WarnMsg( 3, "PES packet too short to have a header" );
137 p_input->p_plugin->pf_delete_pes( p_input->p_method_data, p_pes );
142 /* Get the PES size if defined */
143 p_es->i_pes_real_size = U16_AT(p_header + 4) + 6;
145 /* First read the 6 header bytes common to all PES packets:
146 * use them to test the PES validity */
147 if( (p_header[0] || p_header[1] || (p_header[2] != 1)) )
149 /* packet_start_code_prefix != 0x000001 */
150 intf_ErrMsg( "PES packet doesn't start with 0x000001 : data loss" );
151 p_input->p_plugin->pf_delete_pes( p_input->p_method_data, p_pes );
156 int i_pes_header_size, i_payload_size;
158 if ( p_es->i_pes_real_size &&
159 (p_es->i_pes_real_size != p_pes->i_pes_size) )
161 /* PES_packet_length is set and != total received payload */
162 /* Warn the decoder that the data may be corrupt. */
163 intf_WarnMsg( 3, "PES sizes do not match : packet corrupted" );
164 p_pes->b_messed_up = 1;
167 switch( p_es->i_stream_id )
169 case 0xBC: /* Program stream map */
170 case 0xBE: /* Padding */
171 case 0xBF: /* Private stream 2 */
174 case 0xFF: /* Program stream directory */
175 case 0xF2: /* DSMCC stream */
176 case 0xF8: /* ITU-T H.222.1 type E stream */
177 /* The payload begins immediately after the 6 bytes header, so
178 * we have finished with the parsing */
179 i_pes_header_size = 6;
183 if( (p_header[6] & 0xC0) == 0x80 )
185 /* MPEG-2 : the PES header contains at least 3 more bytes. */
187 boolean_t b_has_pts, b_has_dts;
188 byte_t p_full_header[12];
190 p_pes->b_data_alignment = p_header[6] & 0x04;
192 i_max_len = MoveChunk( p_full_header, &p_data, &p_byte, 12 );
196 "PES packet too short to have a MPEG-2 header" );
197 p_input->p_plugin->pf_delete_pes( p_input->p_method_data,
203 b_has_pts = p_full_header[0] & 0x80;
204 b_has_dts = p_full_header[0] & 0x40;
205 i_pes_header_size = p_full_header[1] + 9;
207 /* Now parse the optional header extensions */
213 "PES packet too short to have a MPEG-2 header" );
214 p_input->p_plugin->pf_delete_pes(
215 p_input->p_method_data,
220 p_pes->i_pts = input_ClockToSysdate( p_input, p_es->p_pgrm,
221 ( ((mtime_t)(p_full_header[2] & 0x0E) << 29) |
222 (((mtime_t)U16_AT(p_full_header + 3) << 14) - (1 << 14)) |
223 ((mtime_t)U16_AT(p_full_header + 5) >> 1) ) )
231 "PES packet too short to have a MPEG-2 header" );
232 p_input->p_plugin->pf_delete_pes(
233 p_input->p_method_data,
238 p_pes->i_dts = input_ClockToSysdate( p_input,
240 ( ((mtime_t)(p_full_header[7] & 0x0E) << 29) |
241 (((mtime_t)U16_AT(p_full_header + 8) << 14)
243 ((mtime_t)U16_AT(p_full_header + 10) >> 1) ) )
250 /* Probably MPEG-1 */
251 boolean_t b_has_pts, b_has_dts;
253 i_pes_header_size = 6;
254 p_data = p_pes->p_first;
255 p_byte = p_data->p_payload_start;
256 /* Cannot fail because the previous one succeeded. */
257 MoveChunk( NULL, &p_data, &p_byte, 6 );
259 while( *p_byte == 0xFF && i_pes_header_size < 22 )
262 if( MoveChunk( NULL, &p_data, &p_byte, 1 ) != 1 )
265 "PES packet too short to have a MPEG-1 header" );
266 p_input->p_plugin->pf_delete_pes( p_input->p_method_data, p_pes );
271 if( i_pes_header_size == 22 )
273 intf_ErrMsg( "Too much MPEG-1 stuffing" );
274 p_input->p_plugin->pf_delete_pes( p_input->p_method_data, p_pes );
279 if( (*p_byte & 0xC0) == 0x40 )
281 /* Don't ask why... --Meuuh */
282 /* Erm... why ? --Sam */
283 /* Well... According to the recommendation, it is for
284 * STD_buffer_scale and STD_buffer_size. --Meuuh */
285 i_pes_header_size += 2;
286 if( MoveChunk( NULL, &p_data, &p_byte, 2 ) != 2 )
289 "PES packet too short to have a MPEG-1 header" );
290 p_input->p_plugin->pf_delete_pes( p_input->p_method_data, p_pes );
298 b_has_pts = *p_byte & 0x20;
299 b_has_dts = *p_byte & 0x10;
305 i_pes_header_size += 4;
306 if( MoveChunk( p_ts, &p_data, &p_byte, 5 ) != 5 )
309 "PES packet too short to have a MPEG-1 header" );
310 p_input->p_plugin->pf_delete_pes(
311 p_input->p_method_data, p_pes );
316 p_pes->i_pts = input_ClockToSysdate( p_input, p_es->p_pgrm,
317 ( ((mtime_t)(p_ts[0] & 0x0E) << 29) |
318 (((mtime_t)U16_AT(p_ts + 1) << 14) - (1 << 14)) |
319 ((mtime_t)U16_AT(p_ts + 3) >> 1) ) )
324 i_pes_header_size += 5;
325 if( MoveChunk( p_ts, &p_data, &p_byte, 5 ) != 5 )
328 "PES packet too short to have a MPEG-1 header" );
329 p_input->p_plugin->pf_delete_pes(
330 p_input->p_method_data, p_pes );
335 p_pes->i_dts = input_ClockToSysdate( p_input,
337 ( ((mtime_t)(p_ts[0] & 0x0E) << 29) |
338 (((mtime_t)U16_AT(p_ts + 1) << 14) - (1 << 14)) |
339 ((mtime_t)U16_AT(p_ts + 3) >> 1) ) )
348 if( p_es->i_stream_id == 0xbd )
350 /* With private stream 1, the first byte of the payload
351 * is a stream_private_id, so skip it. */
355 /* Now we've parsed the header, we just have to indicate in some
356 * specific data packets where the PES payload begins (renumber
357 * p_payload_start), so that the decoders can find the beginning
358 * of their data right out of the box. */
359 p_data = p_pes->p_first;
360 i_payload_size = p_data->p_payload_end
361 - p_data->p_payload_start;
362 while( i_pes_header_size > i_payload_size )
364 /* These packets are entirely filled by the PES header. */
365 i_pes_header_size -= i_payload_size;
366 p_data->p_payload_start = p_data->p_payload_end;
367 /* Go to the next data packet. */
368 if( (p_data = p_data->p_next) == NULL )
370 intf_ErrMsg( "PES header bigger than payload" );
371 p_input->p_plugin->pf_delete_pes( p_input->p_method_data,
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->p_plugin->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->p_plugin->pf_delete_pes( p_input->p_method_data, p_pes );
406 /*****************************************************************************
408 *****************************************************************************
409 * Gather a PES packet.
410 *****************************************************************************/
411 void input_GatherPES( input_thread_t * p_input, data_packet_t * p_data,
412 es_descriptor_t * p_es,
413 boolean_t b_unit_start, boolean_t b_packet_lost )
415 #define p_pes (p_es->p_pes)
417 //intf_DbgMsg("PES-demultiplexing %p (%p)", p_ts_packet, p_pes);
419 /* If we lost data, insert a NULL data packet (philosophy : 0 is quite
420 * often an escape sequence in decoders, so that should make them wait
421 * for the next start code). */
422 if( b_packet_lost || p_es->b_discontinuity )
424 input_NullPacket( p_input, p_es );
427 if( b_unit_start && p_pes != NULL )
429 /* If the data packet contains the begining of a new PES packet, and
430 * if we were reassembling a PES packet, then the PES should be
431 * complete now, so parse its header and give it to the decoders. */
432 input_ParsePES( p_input, p_es );
435 if( !b_unit_start && p_pes == NULL )
437 /* Random access... */
438 p_input->p_plugin->pf_delete_packet( p_input->p_method_data, p_data );
444 /* If we are at the beginning of a new PES packet, we must fetch
445 * a new PES buffer to begin with the reassembly of this PES
446 * packet. This is also here that we can synchronize with the
447 * stream if we lost packets or if the decoder has just
449 if( (p_pes = p_input->p_plugin->pf_new_pes( p_input->p_method_data ) ) == NULL )
451 intf_ErrMsg("Out of memory");
452 p_input->b_error = 1;
455 p_pes->i_rate = p_input->stream.control.i_rate;
456 p_pes->p_first = p_data;
458 /* If the PES header fits in the first data packet, we can
459 * already set p_gather->i_pes_real_size. */
460 if( p_data->p_payload_end - p_data->p_payload_start
463 p_es->i_pes_real_size =
464 U16_AT(p_data->p_payload_start + 4) + 6;
468 p_es->i_pes_real_size = 0;
473 /* Update the relations between the data packets */
474 p_es->p_last->p_next = p_data;
477 p_es->p_last = p_data;
479 /* Size of the payload carried in the data packet */
480 p_pes->i_pes_size += (p_data->p_payload_end
481 - p_data->p_payload_start);
483 /* We can check if the packet is finished */
484 if( p_pes->i_pes_size == p_es->i_pes_real_size )
486 /* The packet is finished, parse it */
487 input_ParsePES( p_input, p_es );
499 * DISCUSSION : SYNCHRONIZATION METHOD
501 * In some cases we can impose the pace of reading (when reading from a
502 * file or a pipe), and for the synchronization we simply sleep() until
503 * it is time to deliver the packet to the decoders. When reading from
504 * the network, we must be read at the same pace as the server writes,
505 * otherwise the kernel's buffer will trash packets. The risk is now to
506 * overflow the input buffers in case the server goes too fast, that is
507 * why we do these calculations :
509 * We compute an average for the pcr because we want to eliminate the
510 * network jitter and keep the low frequency variations. The average is
511 * in fact a low pass filter and the jitter is a high frequency signal
512 * that is why it is eliminated by the filter/average.
514 * The low frequency variations enable us to synchronize the client clock
515 * with the server clock because they represent the time variation between
516 * the 2 clocks. Those variations (ie the filtered pcr) are used to compute
517 * the presentation dates for the audio and video frames. With those dates
518 * we can decode (or trash) the MPEG2 stream at "exactly" the same rate
519 * as it is sent by the server and so we keep the synchronization between
520 * the server and the client.
522 * It is a very important matter if you want to avoid underflow or overflow
523 * in all the FIFOs, but it may be not enough.
526 /*****************************************************************************
528 *****************************************************************************/
530 /* Maximum number of samples used to compute the dynamic average value,
531 * it is also the maximum of c_average_count in pgrm_ts_data_t.
532 * We use the following formula :
533 * new_average = (old_average * c_average + new_sample_value) / (c_average +1) */
534 #define CR_MAX_AVERAGE_COUNTER 40
536 /* Maximum gap allowed between two CRs. */
537 #define CR_MAX_GAP 1000000
539 /*****************************************************************************
540 * CRReInit : Reinitialize the clock reference
541 *****************************************************************************/
542 static void CRReInit( pgrm_descriptor_t * p_pgrm )
544 p_pgrm->delta_cr = 0;
546 p_pgrm->c_average_count = 0;
549 /* FIXME: find a better name */
550 /*****************************************************************************
551 * CRDecode : Decode a clock reference
552 *****************************************************************************/
553 static void CRDecode( input_thread_t * p_input, pgrm_descriptor_t * p_pgrm,
556 if( p_pgrm->i_synchro_state != SYNCHRO_OK )
558 input_ClockNewRef( p_input, p_pgrm, cr_time );
559 p_pgrm->i_synchro_state = SYNCHRO_OK;
563 if( p_pgrm->b_discontinuity ||
564 ( p_pgrm->last_cr != 0 &&
565 ( (p_pgrm->last_cr - cr_time) > CR_MAX_GAP
566 || (p_pgrm->last_cr - cr_time) < - CR_MAX_GAP ) ) )
569 /* This code is deprecated */
572 /* Stream discontinuity. */
573 intf_WarnMsg( 3, "CR re-initialiazed" );
575 p_pgrm->i_synchro_state = SYNCHRO_REINIT;
576 p_pgrm->b_discontinuity = 0;
578 /* Warn all the elementary streams */
579 for( i_es = 0; i_es < p_pgrm->i_es_number; i_es++ )
581 p_pgrm->pp_es[i_es]->b_discontinuity = 1;
585 p_pgrm->last_cr = cr_time;
587 if( p_input->stream.b_pace_control )
589 /* Wait a while before delivering the packets to the decoder. */
590 mwait( input_ClockToSysdate( p_input, p_pgrm, cr_time ) );
595 /* This code is deprecated, too */
596 mtime_t sys_time, delta_cr;
599 delta_cr = sys_time - cr_time;
601 if( p_pgrm->c_average_count == CR_MAX_AVERAGE_COUNTER )
603 p_pgrm->delta_cr = ( delta_cr + (p_pgrm->delta_cr
604 * (CR_MAX_AVERAGE_COUNTER - 1)) )
605 / CR_MAX_AVERAGE_COUNTER;
609 p_pgrm->delta_cr = ( delta_cr + (p_pgrm->delta_cr
610 * p_pgrm->c_average_count) )
611 / ( p_pgrm->c_average_count + 1 );
612 p_pgrm->c_average_count++;
624 /*****************************************************************************
625 * GetID: Get the ID of a stream
626 *****************************************************************************/
627 static u16 GetID( data_packet_t * p_data )
631 i_id = p_data->p_buffer[3]; /* stream_id */
634 /* stream_private_id */
635 i_id |= p_data->p_buffer[ 9 + p_data->p_buffer[8] ] << 8;
640 /*****************************************************************************
641 * DecodePSM: Decode the Program Stream Map information
642 *****************************************************************************/
643 static void DecodePSM( input_thread_t * p_input, data_packet_t * p_data )
645 stream_ps_data_t * p_demux =
646 (stream_ps_data_t *)p_input->stream.p_demux_data;
650 int i_new_es_number = 0;
652 intf_Msg("input info: Your stream contains Program Stream Map information");
653 intf_Msg("input info: Please send a mail to <massiot@via.ecp.fr>");
655 if( p_data->p_payload_start + 10 > p_data->p_payload_end )
657 intf_ErrMsg( "PSM too short : packet corrupt" );
661 if( p_demux->b_has_PSM
662 && p_demux->i_PSM_version == (p_data->p_buffer[6] & 0x1F) )
664 /* Already got that one. */
668 intf_DbgMsg( "Building PSM" );
669 p_demux->b_has_PSM = 1;
670 p_demux->i_PSM_version = p_data->p_buffer[6] & 0x1F;
672 /* Go to elementary_stream_map_length, jumping over
673 * program_stream_info. */
674 p_byte = p_data->p_payload_start + 10
675 + U16_AT(&p_data->p_payload_start[8]);
676 if( p_byte > p_data->p_payload_end )
678 intf_ErrMsg( "PSM too short : packet corrupt" );
681 /* This is the full size of the elementary_stream_map.
682 * 2 == elementary_stream_map_length
683 * Please note that CRC_32 is not included in the length. */
684 p_end = p_byte + 2 + U16_AT(p_byte);
686 if( p_end > p_data->p_payload_end )
688 intf_ErrMsg( "PSM too short : packet corrupt" );
692 vlc_mutex_lock( &p_input->stream.stream_lock );
694 /* 4 == minimum useful size of a section */
695 while( p_byte + 4 <= p_end )
697 es_descriptor_t * p_es = NULL;
698 u8 i_stream_id = p_byte[1];
699 /* FIXME: there will be a problem with private streams... (same
702 /* Look for the ES in the ES table */
703 for( i = i_new_es_number;
704 i < p_input->stream.pp_programs[0]->i_es_number;
707 if( p_input->stream.pp_programs[0]->pp_es[i]->i_stream_id
710 p_es = p_input->stream.pp_programs[0]->pp_es[i];
711 if( p_es->i_type != p_byte[0] )
713 input_DelES( p_input, p_es );
718 /* Move the ES to the beginning. */
719 p_input->stream.pp_programs[0]->pp_es[i]
720 = p_input->stream.pp_programs[0]->pp_es[ i_new_es_number ];
721 p_input->stream.pp_programs[0]->pp_es[ i_new_es_number ]
729 /* The goal is to have all the ES we have just read in the
730 * beginning of the pp_es table, and all the others at the end,
731 * so that we can close them more easily at the end. */
734 p_es = input_AddES( p_input, p_input->stream.pp_programs[0],
736 p_es->i_type = p_byte[0];
737 p_es->b_audio = ( p_es->i_type == MPEG1_AUDIO_ES
738 || p_es->i_type == MPEG2_AUDIO_ES
739 || p_es->i_type == AC3_AUDIO_ES
740 || p_es->i_type == LPCM_AUDIO_ES
743 /* input_AddES has inserted the new element at the end. */
744 p_input->stream.pp_programs[0]->pp_es[
745 p_input->stream.pp_programs[0]->i_es_number ]
746 = p_input->stream.pp_programs[0]->pp_es[ i_new_es_number ];
747 p_input->stream.pp_programs[0]->pp_es[ i_new_es_number ] = p_es;
750 p_byte += 4 + U16_AT(&p_byte[2]);
753 /* Un-select the streams that are no longer parts of the program. */
754 for( i = i_new_es_number;
755 i < p_input->stream.pp_programs[0]->i_es_number;
758 /* We remove pp_es[i_new_es_member] and not pp_es[i] because the
759 * list will be emptied starting from the end */
760 input_DelES( p_input,
761 p_input->stream.pp_programs[0]->pp_es[i_new_es_number] );
765 intf_Msg( "input info: The stream map after the PSM is now :" );
766 input_DumpStream( p_input );
769 vlc_mutex_unlock( &p_input->stream.stream_lock );
772 /*****************************************************************************
773 * input_ParsePS: read the PS header
774 *****************************************************************************/
775 es_descriptor_t * input_ParsePS( input_thread_t * p_input,
776 data_packet_t * p_data )
779 es_descriptor_t * p_es = NULL;
781 i_code = U32_AT( p_data->p_buffer );
782 if( i_code > 0x1BC ) /* ES start code */
787 /* This is a PES packet. Find out if we want it or not. */
788 i_id = GetID( p_data );
790 vlc_mutex_lock( &p_input->stream.stream_lock );
791 if( p_input->stream.pp_programs[0]->b_is_ok )
793 /* Look only at the selected ES. */
794 for( i_dummy = 0; i_dummy < p_input->stream.i_selected_es_number;
797 if( p_input->stream.pp_selected_es[i_dummy] != NULL
798 && p_input->stream.pp_selected_es[i_dummy]->i_id == i_id )
800 p_es = p_input->stream.pp_selected_es[i_dummy];
807 stream_ps_data_t * p_demux =
808 (stream_ps_data_t *)p_input->stream.pp_programs[0]->p_demux_data;
810 /* Search all ES ; if not found -> AddES */
811 p_es = input_FindES( p_input, i_id );
813 if( p_es == NULL && !p_demux->b_has_PSM )
815 p_es = input_AddES( p_input, p_input->stream.pp_programs[0],
819 p_es->i_stream_id = p_data->p_buffer[3];
821 /* Set stream type and auto-spawn. */
822 if( (i_id & 0xF0) == 0xE0 )
825 p_es->i_type = MPEG2_VIDEO_ES;
827 if( !p_input->stream.b_seekable )
828 input_SelectES( p_input, p_es );
831 else if( (i_id & 0xE0) == 0xC0 )
834 p_es->i_type = MPEG2_AUDIO_ES;
837 if( main_GetIntVariable( INPUT_DVD_AUDIO_VAR, 0 )
839 && main_GetIntVariable( INPUT_DVD_CHANNEL_VAR, 0 )
840 == (p_es->i_id & 0x1F) )
842 if( !p_input->stream.b_seekable )
843 input_SelectES( p_input, p_es );
847 else if( (i_id & 0xF0FF) == 0x80BD )
849 /* AC3 audio (0x80->0x8F) */
850 p_es->i_type = AC3_AUDIO_ES;
853 if( main_GetIntVariable( INPUT_DVD_AUDIO_VAR, 0 )
855 && main_GetIntVariable( INPUT_DVD_CHANNEL_VAR, 0 )
856 == ((p_es->i_id & 0xF00) >> 8) )
858 if( !p_input->stream.b_seekable )
859 input_SelectES( p_input, p_es );
863 else if( (i_id & 0xE0FF) == 0x20BD )
865 /* Subtitles video (0x20->0x3F) */
866 p_es->i_type = DVD_SPU_ES;
868 if( main_GetIntVariable( INPUT_DVD_SUBTITLE_VAR, -1 )
869 == ((p_es->i_id & 0x1F00) >> 8) )
871 if( !p_input->stream.b_seekable )
872 input_SelectES( p_input, p_es );
876 else if( (i_id & 0xF0FF) == 0xA0BD )
878 /* LPCM audio (0xA0->0xAF) */
879 p_es->i_type = LPCM_AUDIO_ES;
881 /* FIXME : write the decoder */
885 p_es->i_type = UNKNOWN_ES;
889 } /* stream.b_is_ok */
890 vlc_mutex_unlock( &p_input->stream.stream_lock );
891 } /* i_code > 0xBC */
896 /*****************************************************************************
897 * input_DemuxPS: first step of demultiplexing: the PS header
898 *****************************************************************************/
899 void input_DemuxPS( input_thread_t * p_input, data_packet_t * p_data )
902 boolean_t b_trash = 0;
903 es_descriptor_t * p_es = NULL;
905 i_code = U32_AT( p_data->p_buffer );
906 if( i_code <= 0x1BC )
910 case 0x1BA: /* PACK_START_CODE */
915 if( (p_data->p_buffer[4] & 0xC0) == 0x40 )
919 ((mtime_t)(p_data->p_buffer[4] & 0x38) << 27) |
920 ((mtime_t)(U32_AT(p_data->p_buffer + 4) & 0x03FFF800)
922 ((mtime_t)(U32_AT(p_data->p_buffer + 6) & 0x03FFF800)
927 /* MPEG-1 SCR is like PTS. */
929 ((mtime_t)(p_data->p_buffer[4] & 0x0E) << 29) |
930 (((mtime_t)U16_AT(p_data->p_buffer + 5) << 14)
932 ((mtime_t)U16_AT(p_data->p_buffer + 7) >> 1);
934 /* Call the pace control. */
935 //intf_Msg("+%lld", scr_time);
936 CRDecode( p_input, p_input->stream.pp_programs[0],
942 case 0x1BB: /* SYSTEM_START_CODE */
943 b_trash = 1; /* Nothing interesting */
946 case 0x1BC: /* PROGRAM_STREAM_MAP_CODE */
947 DecodePSM( p_input, p_data );
951 case 0x1B9: /* PROGRAM_END_CODE */
956 /* This should not happen */
958 intf_WarnMsg( 1, "Unwanted packet received with start code %x",
964 p_es = input_ParsePS( p_input, p_data );
966 if( p_es != NULL && p_es->p_decoder_fifo != NULL )
971 input_GatherPES( p_input, p_data, p_es, 1, 0 );
979 /* Trash the packet if it has no payload or if it isn't selected */
982 p_input->p_plugin->pf_delete_packet( p_input, p_data );
984 p_input->c_packets_trashed++;
994 /*****************************************************************************
995 * input_DemuxTS: first step of demultiplexing: the TS header
996 *****************************************************************************/
997 void input_DemuxTS( input_thread_t * p_input, data_packet_t * p_data )
1000 boolean_t b_adaptation; /* Adaptation field is present */
1001 boolean_t b_payload; /* Packet carries payload */
1002 boolean_t b_unit_start; /* A PSI or a PES start in the packet */
1003 boolean_t b_trash = 0; /* Is the packet unuseful ? */
1004 boolean_t b_lost = 0; /* Was there a packet loss ? */
1005 es_descriptor_t * p_es = NULL;
1006 es_ts_data_t * p_es_demux = NULL;
1007 pgrm_ts_data_t * p_pgrm_demux = NULL;
1009 #define p (p_data->p_buffer)
1011 //intf_DbgMsg("input debug: TS-demultiplexing packet %p, pid %d",
1012 // p_ts_packet, U16_AT(&p[1]) & 0x1fff);
1014 /* Extract flags values from TS common header. */
1015 i_pid = U16_AT(&p[1]) & 0x1fff;
1016 b_unit_start = (p[1] & 0x40);
1017 b_adaptation = (p[3] & 0x20);
1018 b_payload = (p[3] & 0x10);
1020 /* Find out the elementary stream. */
1021 vlc_mutex_lock( &p_input->stream.stream_lock );
1022 p_es = input_FindES( p_input, i_pid );
1023 vlc_mutex_unlock( &p_input->stream.stream_lock );
1025 if( p_es == NULL || p_es->p_decoder_fifo == NULL )
1027 /* Not selected. Just read the adaptation field for a PCR. */
1031 if( (p_es->p_decoder_fifo != NULL) || (p_pgrm_demux->i_pcr_pid == i_pid) )
1037 /* Extract adaptation field information if any */
1040 /* We don't have any adaptation_field, so payload starts
1041 * immediately after the 4 byte TS header */
1042 p_data->p_payload_start += 4;
1046 /* p[4] is adaptation_field_length minus one */
1047 p_data->p_payload_start += 5 + p[4];
1049 /* The adaptation field can be limited to the
1050 * adaptation_field_length byte, so that there is nothing to do:
1051 * skip this possibility */
1054 /* If the packet has both adaptation_field and payload,
1055 * adaptation_field cannot be more than 182 bytes long; if
1056 * there is only an adaptation_field, it must fill the next
1058 if( b_payload ? (p[4] > 182) : (p[4] != 183) )
1061 "invalid TS adaptation field (%p)",
1063 p_data->b_discard_payload = 1;
1065 p_es->c_invalid_packets++;
1069 /* Now we are sure that the byte containing flags is present:
1073 /* discontinuity_indicator */
1077 "discontinuity_indicator"
1078 " encountered by TS demux (position read: %d,"
1080 p[5] & 0x80, p_es_demux->i_continuity_counter );
1082 /* If the PID carries the PCR, there will be a system
1083 * time-based discontinuity. We let the PCR decoder
1085 p_es->p_pgrm->b_discontinuity = 1;
1087 /* There also may be a continuity_counter
1088 * discontinuity: resynchronise our counter with
1089 * the one of the stream. */
1090 p_es_demux->i_continuity_counter = (p[3] & 0x0f) - 1;
1093 /* If this is a PCR_PID, and this TS packet contains a
1094 * PCR, we pass it along to the PCR decoder. */
1095 if( (p_pgrm_demux->i_pcr_pid == i_pid) && (p[5] & 0x10) )
1097 /* There should be a PCR field in the packet, check
1098 * if the adaptation field is long enough to carry
1105 ( (mtime_t)U32_AT((u32*)&p[6]) << 1 )
1107 /* Call the pace control. */
1108 CRDecode( p_input, p_es->p_pgrm, pcr_time );
1111 } /* valid TS adaptation field ? */
1113 } /* has adaptation field */
1115 /* Check the continuity of the stream. */
1116 i_dummy = ((p[3] & 0x0f) - p_es_demux->i_continuity_counter) & 0x0f;
1119 /* Everything is ok, just increase our counter */
1120 p_es_demux->i_continuity_counter++;
1124 if( !b_payload && i_dummy == 0 )
1126 /* This is a packet without payload, this is allowed by the
1127 * draft. As there is nothing interesting in this packet
1128 * (except PCR that have already been handled), we can trash
1131 "Packet without payload received by TS demux" );
1134 else if( i_dummy <= 0 )
1136 /* FIXME: this can never happen, can it ? --Meuuh */
1137 /* Duplicate packet: mark it as being to be trashed. */
1138 intf_WarnMsg( 1, "Duplicate packet received by TS demux" );
1141 else if( p_es_demux->i_continuity_counter == 0xFF )
1143 /* This means that the packet is the first one we receive for
1144 * this ES since the continuity counter ranges between 0 and
1145 * 0x0F excepts when it has been initialized by the input:
1146 * init the counter to the correct value. */
1147 intf_DbgMsg( "First packet for PID %d received by TS demux",
1149 p_es_demux->i_continuity_counter = (p[3] & 0x0f);
1153 /* This can indicate that we missed a packet or that the
1154 * continuity_counter wrapped and we received a dup packet:
1155 * as we don't know, do as if we missed a packet to be sure
1156 * to recover from this situation */
1158 "Packet lost by TS demux: current %d, packet %d",
1159 p_es_demux->i_continuity_counter & 0x0f,
1162 p_es_demux->i_continuity_counter = p[3] & 0x0f;
1163 } /* not continuous */
1165 } /* if selected or PCR */
1167 /* Trash the packet if it has no payload or if it isn't selected */
1170 p_input->p_plugin->pf_delete_packet( p_input, p_data );
1172 p_input->c_packets_trashed++;
1177 if( p_es_demux->b_psi )
1179 /* The payload contains PSI tables */
1181 input_DemuxPSI( p_input, p_data, p_es,
1182 b_unit_start, b_lost );
1187 /* The payload carries a PES stream */
1189 input_GatherPES( p_input, p_data, p_es, b_unit_start, b_lost );