1 /*****************************************************************************
2 * input.c: input thread
3 * Read an MPEG2 stream, demultiplex and parse it before sending it to
5 *****************************************************************************
6 * Copyright (C) 1998, 1999, 2000 VideoLAN
8 * Authors: Christophe Massiot <massiot@via.ecp.fr>
9 * BenoƮt Steiner <benny@via.ecp.fr>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
24 *****************************************************************************/
26 /*****************************************************************************
28 *****************************************************************************/
31 #include <errno.h> /* errno */
32 #include <sys/types.h> /* on BSD, uio.h needs types.h */
33 #include <sys/uio.h> /* "input.h" */
34 #include <string.h> /* strerror() */
36 #include <stdlib.h> /* free() */
37 #include <netinet/in.h> /* ntohs() */
48 #include "input_psi.h"
49 #include "input_pcr.h"
50 #include "input_netlist.h"
51 #include "decoder_fifo.h"
52 #include "input_file.h"
53 #include "input_network.h"
55 #include "audio_output.h" /* aout_thread_t */
57 #include "audio_decoder.h" /* audiodec_t (for audio_decoder_thread.h) */
58 #include "audio_decoder_thread.h" /* adec_thread_t */
60 #include "ac3_decoder.h" /* ac3dec_t (for ac3_decoder_thread.h) */
61 #include "ac3_decoder_thread.h" /* ac3dec_thread_t */
63 #include "lpcm_decoder.h"
64 #include "lpcm_decoder_thread.h"
66 #include "video.h" /* picture_t (for video_output.h) */
67 #include "video_output.h" /* vout_thread_t */
69 #include "vdec_idct.h" /* dctelem_t (for video_parser.h) */
70 #include "vdec_motion.h" /* f_motion_t (for video_parser.h) */
71 #include "vpar_blocks.h" /* macroblock_t (for video_parser.h) */
72 #include "vpar_headers.h" /* sequence_t (for video_parser.h) */
73 #include "vpar_synchro.h" /* video_synchro_t (for video_parser.h) */
74 #include "video_parser.h" /* vpar_thread_t */
76 #include "spu_decoder.h" /* spudec_thread_t */
80 /*****************************************************************************
82 *****************************************************************************/
83 static void RunThread ( input_thread_t *p_input );
84 static void ErrorThread ( input_thread_t *p_input );
85 static void EndThread ( input_thread_t *p_input );
87 static __inline__ int input_ReadPacket( input_thread_t *p_input );
88 static __inline__ void input_SortPacket( input_thread_t *p_input,
89 ts_packet_t *ts_packet );
90 static __inline__ void input_DemuxTS( input_thread_t *p_input,
91 ts_packet_t *ts_packet,
92 es_descriptor_t *es_descriptor );
93 static __inline__ void input_DemuxPES( input_thread_t *p_input,
94 ts_packet_t *ts_packet,
95 es_descriptor_t *p_es_descriptor,
96 boolean_t b_unit_start,
97 boolean_t b_packet_lost );
98 static __inline__ void input_ParsePES( input_thread_t *p_input,
99 es_descriptor_t *p_es_descriptor );
100 static __inline__ void input_DemuxPSI( input_thread_t *p_input,
101 ts_packet_t *ts_packet,
102 es_descriptor_t *p_es_descriptor,
103 boolean_t b_unit_start,
104 boolean_t b_packet_lost );
106 /*****************************************************************************
107 * input_CreateThread: creates a new input thread
108 *****************************************************************************
109 * This function creates a new input, and returns a pointer
110 * to its description. On error, it returns NULL.
111 * If pi_status is NULL, then the function will block until the thread is ready.
112 * If not, it will be updated using one of the THREAD_* constants.
113 *****************************************************************************/
114 input_thread_t *input_CreateThread ( int i_method, void *p_source, int i_port,
115 int i_vlan, p_vout_thread_t p_vout,
116 p_aout_thread_t p_aout, int *pi_status )
118 input_thread_t * p_input; /* thread descriptor */
119 int i_status; /* thread status */
120 int i_index; /* index for tables initialization */
122 /* Allocate descriptor */
124 p_input = (input_thread_t *)malloc( sizeof(input_thread_t) );
125 if( p_input == NULL )
127 intf_ErrMsg("error: %s\n", strerror(ENOMEM));
131 /* Initialize thread properties */
133 p_input->b_error = 0;
134 p_input->pi_status = (pi_status != NULL) ? pi_status : &i_status;
135 *p_input->pi_status = THREAD_CREATE;
137 /* Initialize input method description */
138 p_input->i_method = i_method;
139 p_input->p_source = p_source;
140 p_input->i_port = i_port;
141 p_input->i_vlan = i_vlan;
144 case INPUT_METHOD_TS_FILE: /* file methods */
145 p_input->p_Open = input_FileOpen;
146 p_input->p_Read = input_FileRead;
147 p_input->p_Close = input_FileClose;
149 case INPUT_METHOD_TS_VLAN_BCAST: /* vlan network method */
150 if( !p_main->b_vlans )
152 intf_ErrMsg("error: vlans are not activated\n");
156 /* ... pass through */
157 case INPUT_METHOD_TS_UCAST: /* network methods */
158 case INPUT_METHOD_TS_MCAST:
159 case INPUT_METHOD_TS_BCAST:
160 p_input->p_Open = input_NetworkOpen;
161 p_input->p_Read = input_NetworkRead;
162 p_input->p_Close = input_NetworkClose;
165 intf_ErrMsg("error: unknow input method\n");
171 /* Initialize stream description */
172 for( i_index = 0; i_index < INPUT_MAX_ES; i_index++ )
174 p_input->p_es[i_index].i_id = EMPTY_PID;
175 p_input->pp_selected_es[i_index] = NULL;
178 /* Initialize default settings for spawned decoders */
179 p_input->p_aout = p_aout;
180 p_input->p_vout = p_vout;
183 /* Initialize statistics */
184 p_input->c_loops = 0;
185 p_input->c_bytes = 0;
186 p_input->c_payload_bytes = 0;
187 p_input->c_packets_read = 0;
188 p_input->c_packets_trashed = 0;
191 /* Initialize PSI and PCR decoders */
192 if( input_PsiInit( p_input ) )
198 if( input_PcrInit( p_input ) )
200 input_PsiEnd( p_input );
205 /* Initialize netlists */
206 if( input_NetlistInit( p_input ) )
208 input_PsiEnd( p_input );
209 input_PcrEnd( p_input );
214 intf_DbgMsg("configuration: method=%d, source=%s, port=%d, vlan=%d\n",
215 i_method, p_source, i_port, i_vlan );
217 /* Let the appropriate method open the socket. */
218 if( p_input->p_Open( p_input ) )
220 input_NetlistEnd( p_input );
221 input_PsiEnd( p_input );
222 input_PcrEnd( p_input );
227 /* Create thread and set locks. */
228 vlc_mutex_init( &p_input->netlist.lock );
229 vlc_mutex_init( &p_input->programs_lock );
230 vlc_mutex_init( &p_input->es_lock );
231 if( vlc_thread_create(&p_input->thread_id, "input", (void *) RunThread, (void *) p_input) )
233 intf_ErrMsg("error: %s\n", strerror(errno) );
234 p_input->p_Close( p_input );
235 input_NetlistEnd( p_input );;
236 input_PsiEnd( p_input );
237 input_PcrEnd( p_input );
242 intf_Msg("Input initialized\n");
244 /* If status is NULL, wait until the thread is created */
245 if( pi_status == NULL )
249 msleep( THREAD_SLEEP );
250 }while( (i_status != THREAD_READY) && (i_status != THREAD_ERROR)
251 && (i_status != THREAD_FATAL) );
252 if( i_status != THREAD_READY )
260 /*****************************************************************************
261 * input_DestroyThread: mark an input thread as zombie
262 *****************************************************************************
263 * This function should not return until the thread is effectively cancelled.
264 *****************************************************************************/
265 void input_DestroyThread( input_thread_t *p_input, int *pi_status )
267 int i_status; /* thread status */
270 p_input->pi_status = (pi_status != NULL) ? pi_status : &i_status;
271 *p_input->pi_status = THREAD_DESTROY;
273 /* Request thread destruction */
276 /* If status is NULL, wait until thread has been destroyed */
277 if( pi_status == NULL )
281 msleep( THREAD_SLEEP );
282 }while( (i_status != THREAD_OVER) && (i_status != THREAD_ERROR)
283 && (i_status != THREAD_FATAL) );
288 /*****************************************************************************
289 * input_OpenAudioStream: open an audio stream
290 *****************************************************************************
291 * This function spawns an audio decoder and plugs it on the audio output
293 *****************************************************************************/
294 int input_OpenAudioStream( input_thread_t *p_input, int i_id )
299 /*****************************************************************************
300 * input_CloseAudioStream: close an audio stream
301 *****************************************************************************
302 * This function destroys an audio decoder.
303 *****************************************************************************/
304 void input_CloseAudioStream( input_thread_t *p_input, int i_id )
309 /*****************************************************************************
310 * input_OpenVideoStream: open a video stream
311 *****************************************************************************
312 * This function spawns a video decoder and plugs it on a video output thread.
313 *****************************************************************************/
314 int input_OpenVideoStream( input_thread_t *p_input,
315 struct vout_thread_s *p_vout, struct video_cfg_s * p_cfg )
320 /*****************************************************************************
321 * input_CloseVideoStream: close a video stream
322 *****************************************************************************
323 * This function destroys an video decoder.
324 *****************************************************************************/
325 void input_CloseVideoStream( input_thread_t *p_input, int i_id )
331 /* following functions are local */
333 /*****************************************************************************
334 * InitThread: initialize input thread
335 *****************************************************************************
336 * This function is called from RunThread and performs the second step of the
337 * initialization. It returns 0 on success. Note that the thread's flag are not
338 * modified inside this function.
339 *****************************************************************************/
340 static int InitThread( input_thread_t *p_input )
342 /* Mark thread as running and return */
344 *p_input->pi_status = THREAD_READY;
345 intf_DbgMsg("thread ready\n");
349 /*****************************************************************************
351 *****************************************************************************
352 * Notice that current ES state has been locked by input_SortPacket.
353 * (No more true, changed by benny - FIXME: See if it's ok, and definitely
354 * change the code ?? )
355 *****************************************************************************/
356 static __inline__ void input_DemuxPSI( input_thread_t *p_input,
357 ts_packet_t *p_ts_packet,
358 es_descriptor_t *p_es_descriptor,
359 boolean_t b_unit_start,
360 boolean_t b_packet_lost )
362 int i_data_offset; /* Offset of the interesting data in the TS packet */
363 u16 i_data_length; /* Length of those data */
364 //boolean_t b_first_section; /* another section in the TS packet ? */
368 ASSERT(p_es_descriptor);
370 #define p_psi (p_es_descriptor->p_psi_section)
372 //intf_DbgMsg( "input debug: PSI demultiplexing %p (%p)\n", p_ts_packet, p_input);
374 //intf_DbgMsg( "Packet: %x %x %x %x %x %x %x %x %x %x %x %x %x %x %x %x %x %x %x %x %x (unit start: %d)\n", p_ts_packet->buffer[p_ts_packet->i_payload_start], p_ts_packet->buffer[p_ts_packet->i_payload_start+1], p_ts_packet->buffer[p_ts_packet->i_payload_start+2], p_ts_packet->buffer[p_ts_packet->i_payload_start+3], p_ts_packet->buffer[p_ts_packet->i_payload_start+4], p_ts_packet->buffer[p_ts_packet->i_payload_start+5], p_ts_packet->buffer[p_ts_packet->i_payload_start+6], p_ts_packet->buffer[p_ts_packet->i_payload_start+7], p_ts_packet->buffer[p_ts_packet->i_payload_start+8], p_ts_packet->buffer[p_ts_packet->i_payload_start+9], p_ts_packet->buffer[p_ts_packet->i_payload_start+10], p_ts_packet->buffer[p_ts_packet->i_payload_start+11], p_ts_packet->buffer[p_ts_packet->i_payload_start+12], p_ts_packet->buffer[p_ts_packet->i_payload_start+13], p_ts_packet->buffer[p_ts_packet->i_payload_start+14], p_ts_packet->buffer[p_ts_packet->i_payload_start+15], p_ts_packet->buffer[p_ts_packet->i_payload_start+16], p_ts_packet->buffer[p_ts_packet->i_payload_start+17], p_ts_packet->buffer[p_ts_packet->i_payload_start+18], p_ts_packet->buffer[p_ts_packet->i_payload_start+19], p_ts_packet->buffer[p_ts_packet->i_payload_start+20], b_unit_start);
377 /* Try to find the beginning of the payload in the packet to initialise
378 * the do-while loop that follows -> Compute the i_data_offset variable:
379 * by default, the value is set so that we won't enter in the while loop.
380 * It will be set to a correct value if the data are not corrupted */
381 i_data_offset = TS_PACKET_SIZE;
383 /* Has the reassembly of a section already begun in a previous packet ? */
384 if( p_psi->b_running_section )
386 /* Was data lost since the last TS packet ? */
389 /* Discard the packet and wait for the begining of a new one
391 p_psi->b_running_section = 0;
392 p_psi->i_current_position = 0;
393 intf_DbgMsg( "PSI section(s) discarded due to packet loss\n" );
397 /* The data that complete a previously began section are always at
398 * the beginning of the TS payload... */
399 i_data_offset = p_ts_packet->i_payload_start;
400 /* ...Unless there is a pointer field, that we have to bypass */
403 //intf_DbgMsg( "New part of the section received at offset %d\n", i_data_offset );
406 /* We are looking for the beginning of a new section */
411 /* Get the offset at which the data for that section can be found
412 * The offset is stored in the pointer_field since we are
413 * interested in the first section of the TS packet. Note that
414 * the +1 is to bypass the pointer field */
415 i_data_offset = p_ts_packet->i_payload_start +
416 p_ts_packet->buffer[p_ts_packet->i_payload_start] + 1;
417 //intf_DbgMsg( "New section beginning at offset %d in TS packet\n", i_data_offset );
421 /* This may either mean that the TS is bad or that the packet
422 * contains the end of a section that had been discarded in a
423 * previous loop: trash the TS packet since we cannot do
424 * anything with those data: */
425 p_psi->b_running_section = 0;
426 p_psi->i_current_position = 0;
427 intf_DbgMsg( "PSI packet discarded due to lack of synchronisation\n" );
431 /* The section we will deal with during the first iteration of the
432 * following loop is the first one contained in the TS packet */
433 // b_first_section = 1;
435 /* Reassemble the pieces of sections contained in the TS packet and
436 * decode the sections that could have been completed.
437 * Stop when we reach the end of the packet or stuffing bytes */
438 while( i_data_offset < TS_PACKET_SIZE && p_ts_packet->buffer[i_data_offset] != 0xFF )
440 /* If the current section is a new one, reinit the data fields of
441 * the p_psi struct to start its decoding */
442 if( !p_psi->b_running_section )
444 /* Read the length of the new section */
445 p_psi->i_length = (U16_AT(&p_ts_packet->buffer[i_data_offset+1]) & 0xFFF) + 3;
446 //intf_DbgMsg( "Section length %d\n", p_psi->i_length );
447 if( p_psi->i_length > PSI_SECTION_SIZE )
449 /* The TS packet is corrupted, stop here to avoid possible
451 intf_DbgMsg( "PSI Section size is too big, aborting its reception\n" );
455 /* Init the reassembly of that section */
456 p_psi->b_running_section = 1;
457 p_psi->i_current_position = 0;
460 /* Compute the length of data related to the section in this TS packet */
461 if( p_psi->i_length - p_psi->i_current_position > TS_PACKET_SIZE - i_data_offset)
462 i_data_length = TS_PACKET_SIZE - i_data_offset;
464 i_data_length = p_psi->i_length - p_psi->i_current_position;
466 /* Copy those data in the section buffer */
467 memcpy( &p_psi->buffer[p_psi->i_current_position], &p_ts_packet->buffer[i_data_offset],
470 /* Interesting data are now after the ones we copied, since no gap is
471 * allowed between 2 sections in a TS packets */
472 i_data_offset += i_data_length;
474 /* Decode the packet if it is now complete */
475 if (p_psi->i_length == p_psi->i_current_position + i_data_length)
477 /* Packet is complete, decode it */
478 //intf_DbgMsg( "SECTION COMPLETE: starting decoding of its data\n" );
479 input_PsiDecode( p_input, p_psi );
481 /* Prepare the buffer to receive a new section */
482 p_psi->i_current_position = 0;
483 p_psi->b_running_section = 0;
485 /* The new section won't be the first anymore */
486 //b_first_section = 0;
490 /* Prepare the buffer to receive the next part of the section */
491 p_psi->i_current_position += i_data_length;
492 //intf_DbgMsg( "Section not complete, waiting for the end\n" );
495 //intf_DbgMsg( "Must loop ? Next data offset: %d, stuffing: %d\n",
496 // i_data_offset, p_ts_packet->buffer[i_data_offset] );
499 /* Relase the TS packet, we don't need it anymore */
500 input_NetlistFreeTS( p_input, p_ts_packet );
505 /*****************************************************************************
507 *****************************************************************************
508 * Parse a finished PES packet and analyze its header.
509 *****************************************************************************/
510 static __inline__ void input_ParsePES( input_thread_t *p_input,
511 es_descriptor_t *p_es_descriptor )
513 decoder_fifo_t * p_fifo;
514 u8 i_pes_header_size;
516 int i_ts_payload_size;
519 #define p_pes (p_es_descriptor->p_pes_packet)
521 //intf_DbgMsg("End of PES packet %p\n", p_pes);
523 /* First read the 6 header bytes common to all PES packets:
524 use them to test the PES validity */
525 if( (p_pes->p_pes_header[0] || p_pes->p_pes_header[1] ||
526 (p_pes->p_pes_header[2] != 1)) ||
527 /* packet_start_code_prefix != 0x000001 */
528 ((p_pes->i_pes_real_size) &&
529 (p_pes->i_pes_real_size != p_pes->i_pes_size)) )
530 /* PES_packet_length is set and != total received payload */
532 /* Trash the packet and set p_pes to NULL to be sure the next PES
533 packet will have its b_data_lost flag set */
534 intf_DbgMsg("Corrupted PES packet (size doesn't match) : trashed\n");
535 input_NetlistFreePES( p_input, p_pes );
541 /* The PES packet is valid. Check its type to test if it may
542 carry additional informations in a header extension */
543 p_pes->i_stream_id = p_pes->p_pes_header[3];
545 switch( p_pes->i_stream_id )
547 case 0xBE: /* Padding */
548 case 0xBC: /* Program stream map */
549 case 0xBF: /* Private stream 2 */
552 case 0xFF: /* Program stream directory */
553 case 0xF2: /* DSMCC stream */
554 case 0xF8: /* ITU-T H.222.1 type E stream */
555 /* The payload begins immediatly after the 6 bytes header, so
556 we have finished with the parsing */
557 i_pes_header_size = 6;
561 switch( p_pes->p_pes_header[8] & 0xc0 )
563 case 0x80: /* MPEG2: 10xx xxxx */
564 case 0x00: /* FIXME: This shouldn't be allowed !! */
565 /* The PES header contains at least 3 more bytes: parse them */
566 p_pes->b_data_alignment = p_pes->p_pes_header[6] & 0x04;
567 p_pes->b_has_pts = p_pes->p_pes_header[7] & 0x80;
568 i_pes_header_size = p_pes->p_pes_header[8] + 9;
570 /* Now parse the optional header extensions (in the limit of
572 if( p_pes->b_has_pts )
574 pcr_descriptor_t * p_pcr;
576 p_pcr = p_input->p_pcr;
579 ( ((mtime_t)(p_pes->p_pes_header[9] & 0x0E) << 29) |
580 (((mtime_t)U16_AT(p_pes->p_pes_header + 10) << 14) - (1 << 14)) |
581 ((mtime_t)U16_AT(p_pes->p_pes_header + 12) >> 1) ) * 300;
584 if( p_pcr->i_synchro_state )
586 switch( p_pcr->i_synchro_state )
588 case SYNCHRO_NOT_STARTED:
589 p_pes->b_has_pts = 0;
593 p_pes->i_pts += p_pcr->delta_pcr;
594 p_pcr->delta_absolute = mdate() - p_pes->i_pts + INPUT_PTS_DELAY;
595 p_pes->i_pts += p_pcr->delta_absolute;
596 p_pcr->i_synchro_state = 0;
599 case SYNCHRO_REINIT: /* We skip a PES */
600 p_pes->b_has_pts = 0;
601 p_pcr->i_synchro_state = SYNCHRO_START;
607 p_pes->i_pts += p_pcr->delta_pcr + p_pcr->delta_absolute;
612 default: /* MPEG1 or some strange thing */
613 /* since this isn't supported yet, we certainly gonna crash */
614 intf_ErrMsg( "FIXME: unknown PES type %.2x\n",
615 p_pes->p_pes_header[8] );
616 i_pes_header_size = 6;
623 /* Now we've parsed the header, we just have to indicate in some
624 * specific TS packets where the PES payload begins (renumber
625 * i_payload_start), so that the decoders can find the beginning
626 * of their data right out of the box. */
627 p_ts = p_pes->p_first_ts;
628 i_ts_payload_size = p_ts->i_payload_end - p_ts->i_payload_start;
629 while( i_pes_header_size > i_ts_payload_size )
631 /* These packets are entirely filled by the PES header. */
632 i_pes_header_size -= i_ts_payload_size;
633 p_ts->i_payload_start = p_ts->i_payload_end;
634 /* Go to the next TS packet: here we won't have to test it is
635 * not NULL because we trash the PES packets when packet lost
637 p_ts = p_ts->p_next_ts;
638 i_ts_payload_size = p_ts->i_payload_end - p_ts->i_payload_start;
640 /* This last packet is partly header, partly payload. */
641 p_ts->i_payload_start += i_pes_header_size;
644 /* Now we can eventually put the PES packet in the decoder's
646 switch( p_es_descriptor->i_type )
650 p_fifo = &(((vpar_thread_t*)(p_es_descriptor->p_dec))->fifo);
655 p_fifo = &(((adec_thread_t*)(p_es_descriptor->p_dec))->fifo);
659 p_fifo = &(((ac3dec_thread_t *)(p_es_descriptor->p_dec))->fifo);
663 p_fifo = &(((lpcmdec_thread_t *)(p_es_descriptor->p_dec))->fifo);
667 /* we skip the first byte at the beginning of the
668 * subpicture payload, it only contains the SPU ID. */
669 p_ts->i_payload_start++;
670 p_fifo = &(((spudec_thread_t *)(p_es_descriptor->p_dec))->fifo);
674 /* This should never happen */
675 intf_DbgMsg("Unknown stream type (%d, %d): PES trashed\n",
676 p_es_descriptor->i_id, p_es_descriptor->i_type);
683 vlc_mutex_lock( &p_fifo->data_lock );
684 if( DECODER_FIFO_ISFULL( *p_fifo ) )
686 /* The FIFO is full !!! This should not happen. */
688 p_input->c_packets_trashed += p_pes->i_ts_packets;
689 p_es_descriptor->c_invalid_packets += p_pes->i_ts_packets;
691 input_NetlistFreePES( p_input, p_pes );
692 intf_DbgMsg("PES trashed - fifo full ! (%d, %d)\n",
693 p_es_descriptor->i_id, p_es_descriptor->i_type);
697 //intf_DbgMsg("Putting %p into fifo %p/%d\n",
698 // p_pes, p_fifo, p_fifo->i_end);
699 p_fifo->buffer[p_fifo->i_end] = p_pes;
700 DECODER_FIFO_INCEND( *p_fifo );
702 /* Warn the decoder that it's got work to do. */
703 vlc_cond_signal( &p_fifo->data_wait );
705 vlc_mutex_unlock( &p_fifo->data_lock );
709 intf_DbgMsg("No fifo to receive PES %p: trash\n", p_pes);
711 p_input->c_packets_trashed += p_pes->i_ts_packets;
712 p_es_descriptor->c_invalid_packets += p_pes->i_ts_packets;
714 input_NetlistFreePES( p_input, p_pes );
720 /*****************************************************************************
722 *****************************************************************************
723 * Gather a PES packet.
724 *****************************************************************************/
725 static __inline__ void input_DemuxPES( input_thread_t *p_input,
726 ts_packet_t *p_ts_packet,
727 es_descriptor_t *p_es_descriptor,
728 boolean_t b_unit_start,
729 boolean_t b_packet_lost )
732 pes_packet_t* p_last_pes;
734 int i_ts_payload_size;
737 #define p_pes (p_es_descriptor->p_pes_packet)
741 ASSERT(p_es_descriptor);
743 //intf_DbgMsg("PES-demultiplexing %p (%p)\n", p_ts_packet, p_pes);
745 /* If we lost data, discard the PES packet we are trying to reassemble
746 if any and wait for the beginning of a new one in order to synchronise
748 if( b_packet_lost && p_pes != NULL )
750 intf_DbgMsg("PES %p trashed because of packet lost\n", p_pes);
751 input_NetlistFreePES( p_input, p_pes );
755 /* If the TS packet contains the begining of a new PES packet, and if we
756 were reassembling a PES packet, then the PES should be complete now,
757 so parse its header and give it to the decoders */
758 if( b_unit_start && p_pes != NULL )
760 /* Parse the header. The header has a variable length, but in order
761 to improve the algorithm, we will read the 14 bytes we may be
764 /* If this part of the header did not fit in the current TS packet,
765 copy the part of the header we are interested in to the
766 p_pes_header_save buffer. The buffer is dynamicly allocated if
767 needed so it's time expensive but this situation almost never
769 p_ts = p_pes->p_first_ts;
770 i_ts_payload_size = p_ts->i_payload_end - p_ts->i_payload_start;
772 if(i_ts_payload_size < PES_HEADER_SIZE)
774 intf_WarnMsg(3, "Code never tested encountered, WARNING ! (benny)\n");
775 if( !p_pes->p_pes_header_save )
777 p_pes->p_pes_header_save = malloc(PES_HEADER_SIZE);
783 memcpy( p_pes->p_pes_header_save + i_dummy,
784 &p_ts->buffer[p_ts->i_payload_start],
786 i_dummy += i_ts_payload_size;
788 p_ts = p_ts->p_next_ts;
791 /* The payload of the PES packet is shorter than the 14 bytes
792 we would read. This means that high packet lost occured
793 so the PES won't be useful for any decoder. Moreover,
794 this should never happen so we can trash the packet and
795 exit roughly without regrets */
796 intf_DbgMsg("PES packet too short: trashed\n");
797 input_NetlistFreePES( p_input, p_pes );
803 i_ts_payload_size = p_ts->i_payload_end - p_ts->i_payload_start;
805 while(i_ts_payload_size + i_dummy < PES_HEADER_SIZE);
807 /* This last TS packet is partly header, partly payload, so just
808 copy the header part */
809 memcpy(p_pes->p_pes_header_save + i_dummy,
810 &p_ts->buffer[p_ts->i_payload_start],
811 PES_HEADER_SIZE - i_dummy);
813 /* The header must be read in the buffer not in any TS packet */
814 p_pes->p_pes_header = p_pes->p_pes_header_save;
816 /* Get the PES size if defined */
817 if( (i_dummy = U16_AT(p_pes->p_pes_header + 4)) )
819 p_pes->i_pes_real_size = i_dummy + 6;
823 /* Now we have the part of the PES header we were interested in:
824 p_pes_header and i_pes_real_size ; we can parse it */
825 input_ParsePES( p_input, p_es_descriptor );
828 /* If we are at the beginning of a new PES packet, we must fetch a new
829 PES buffer to begin with the reassembly of this PES packet. This is
830 also here that we can synchronise with the stream if we we lost
831 packets or if the decoder has just started */
836 /* Get a new one PES from the PES netlist. */
837 if( (p_pes = input_NetlistGetPES( p_input )) == (NULL) )
839 /* PES netlist is empty ! */
840 p_input->b_error = 1;
844 //intf_DbgMsg("New PES packet %p (first TS: %p)\n", p_pes, p_ts_packet);
846 /* Init the PES fields so that the first TS packet could be
847 * correctly added to the PES packet (see below) */
848 p_pes->p_first_ts = p_ts_packet;
849 p_pes->p_last_ts = NULL;
851 /* If the last pes packet was null, this means that the
852 * synchronization was lost and so warn the decoder that he
853 * will have to find a way to recover */
855 p_pes->b_data_loss = 1;
857 /* Read the b_random_access flag status and then reinit it */
858 p_pes->b_random_access = p_es_descriptor->b_random;
859 p_es_descriptor->b_random = 0;
862 /* If the PES header fits in the first TS packet, we can
863 * already set p_pes->p_pes_header, and in all cases we
864 * set p_pes->i_pes_real_size */
865 if( p_ts_packet->i_payload_end - p_ts_packet->i_payload_start
868 p_pes->p_pes_header = &(p_ts_packet->buffer[p_ts_packet->i_payload_start]);
869 if( (i_dummy = U16_AT(p_pes->p_pes_header + 4)) )
871 p_pes->i_pes_real_size = i_dummy + 6;
877 /* If we are synchronized with the stream, and so if we are ready to
878 receive correctly the data, add the TS packet to the current PES
882 //intf_DbgMsg("Adding TS %p to PES %p\n", p_ts_packet, p_pes);
884 /* Size of the payload carried in the TS packet */
885 i_ts_payload_size = p_ts_packet->i_payload_end -
886 p_ts_packet->i_payload_start;
888 /* Update the relations between the TS packets */
889 p_ts_packet->p_prev_ts = p_pes->p_last_ts;
890 p_ts_packet->p_next_ts = NULL;
891 if( p_pes->i_ts_packets != 0 )
893 /* Regarder si il serait pas plus efficace de ne creer que
894 * les liens precedent->suivant pour le moment, et les
895 * liens suivant->precedent quand le paquet est termine */
896 /* Otherwise it is the first TS packet. */
897 p_pes->p_last_ts->p_next_ts = p_ts_packet;
899 /* Now add the TS to the PES packet */
900 p_pes->p_last_ts = p_ts_packet;
901 p_pes->i_ts_packets++;
902 p_pes->i_pes_size += i_ts_payload_size;
906 i_dummy = p_ts_packet->i_payload_end - p_ts_packet->i_payload_start;
907 p_es_descriptor->c_payload_bytes += i_dummy;
908 p_input->c_payload_bytes += i_dummy;
911 /* We can check if the packet is finished */
912 if( p_pes->i_pes_size == p_pes->i_pes_real_size )
914 /* The packet is finished, parse it */
915 input_ParsePES( p_input, p_es_descriptor );
917 /* Tell the Demux we have parsed this PES, no need to redo it */
923 /* Since we don't use the TS packet to build a PES packet, we don't
924 need it anymore, so give it back to the netlist */
925 //intf_DbgMsg("Trashing TS %p: no PES being build\n", p_ts_packet);
926 input_NetlistFreeTS( p_input, p_ts_packet );
932 /*****************************************************************************
933 * input_DemuxTS: first step of demultiplexing: the TS header
934 *****************************************************************************
935 * Stream must also only contain PES and PSI, so PID must have been filtered
936 *****************************************************************************/
937 static __inline__ void input_DemuxTS( input_thread_t *p_input,
938 ts_packet_t *p_ts_packet,
939 es_descriptor_t *p_es_descriptor )
942 boolean_t b_adaption; /* Adaption field is present */
943 boolean_t b_payload; /* Packet carries payload */
944 boolean_t b_unit_start; /* A PSI or a PES start in the packet */
945 boolean_t b_trash = 0; /* Must the packet be trashed ? */
946 boolean_t b_lost = 0; /* Was there a packet lost ? */
950 ASSERT(p_es_descriptor);
952 #define p (p_ts_packet->buffer)
954 //intf_DbgMsg("input debug: TS-demultiplexing packet %p, pid %d, number %d\n",
955 // p_ts_packet, U16_AT(&p[1]) & 0x1fff, p[3] & 0x0f);
958 p_es_descriptor->c_packets++;
959 p_es_descriptor->c_bytes += TS_PACKET_SIZE;
962 /* Extract flags values from TS common header. */
963 b_unit_start = (p[1] & 0x40);
964 b_adaption = (p[3] & 0x20);
965 b_payload = (p[3] & 0x10);
967 /* Extract adaption field informations if any */
970 /* We don't have any adaptation_field, so payload start immediately
971 after the 4 byte TS header */
972 p_ts_packet->i_payload_start = 4;
976 /* p[4] is adaptation_field_length minus one */
977 p_ts_packet->i_payload_start = 5 + p[4];
979 /* The adaption field can be limited to the adaptation_field_length byte,
980 so that there is nothing to do: skip this possibility */
983 /* If the packet has both adaptation_field and payload, adaptation_field
984 cannot be more than 182 bytes long; if there is only an
985 adaptation_field, it must fill the next 183 bytes. */
986 if( b_payload ? (p[4] > 182) : (p[4] != 183) )
988 intf_DbgMsg("input debug: invalid TS adaptation field (%p)\n",
991 p_es_descriptor->c_invalid_packets++;
996 /* No we are sure that the byte containing flags is present: read it */
999 /* discontinuity_indicator */
1002 intf_DbgMsg("discontinuity_indicator encountered by TS demux " \
1003 "(position read: %d, saved: %d)\n", p[5] & 0x80,
1004 p_es_descriptor->i_continuity_counter);
1006 /* If the PID carries the PCR, there will be a system time-base
1007 discontinuity. We let the PCR decoder handle that. */
1008 p_es_descriptor->b_discontinuity = 1;
1010 /* There also may be a continuity_counter discontinuity:
1011 resynchronise our counter with the one of the stream */
1012 p_es_descriptor->i_continuity_counter = (p[3] & 0x0f) - 1;
1015 /* random_access_indicator */
1016 p_es_descriptor->b_random |= p[5] & 0x40;
1018 /* If this is a PCR_PID, and this TS packet contains a PCR,
1019 we pass it along to the PCR decoder. */
1020 if( (p_es_descriptor->b_pcr) && (p[5] & 0x10) )
1022 /* There should be a PCR field in the packet, check if the
1023 adaption field is long enough to carry it */
1026 /* Call the PCR decoder */
1027 input_PcrDecode( p_input, p_es_descriptor, &p[6] );
1034 /* Check the continuity of the stream. */
1035 i_dummy = ((p[3] & 0x0f) - p_es_descriptor->i_continuity_counter) & 0x0f;
1038 /* Everything is ok, just increase our counter */
1039 p_es_descriptor->i_continuity_counter++;
1043 if( !b_payload && i_dummy == 0 )
1045 /* This is a packet without payload, this is allowed by the draft
1046 As there is nothing interesting in this packet (except PCR that
1047 have already been handled), we can trash the packet. */
1048 intf_DbgMsg("Packet without payload received by TS demux\n");
1051 else if( i_dummy <= 0 )
1053 /* Duplicate packet: mark it as being to be trashed. */
1054 intf_DbgMsg("Duplicate packet received by TS demux\n");
1057 else if( p_es_descriptor->i_continuity_counter == 0xFF )
1059 /* This means that the packet is the first one we receive for this
1060 ES since the continuity counter ranges between 0 and 0x0F
1061 excepts when it has been initialized by the input: Init the
1062 counter to the correct value. */
1063 intf_DbgMsg("First packet for PID %d received by TS demux\n",
1064 p_es_descriptor->i_id);
1065 p_es_descriptor->i_continuity_counter = (p[3] & 0x0f);
1069 /* This can indicate that we missed a packet or that the
1070 continuity_counter wrapped and we received a dup packet: as we
1071 don't know, do as if we missed a packet to be sure to recover
1072 from this situation */
1073 intf_DbgMsg("Packet lost by TS demux: current %d, packet %d\n",
1074 p_es_descriptor->i_continuity_counter & 0x0f,
1077 p_es_descriptor->i_continuity_counter = p[3] & 0x0f;
1081 /* Trash the packet if it has no payload or if it is bad */
1084 input_NetlistFreeTS( p_input, p_ts_packet );
1086 p_input->c_packets_trashed++;
1091 if( p_es_descriptor->b_psi )
1093 /* The payload contains PSI tables */
1094 input_DemuxPSI( p_input, p_ts_packet, p_es_descriptor,
1095 b_unit_start, b_lost );
1099 /* The payload carries a PES stream */
1100 input_DemuxPES( p_input, p_ts_packet, p_es_descriptor,
1101 b_unit_start, b_lost );
1108 /*****************************************************************************
1109 * input_SortPacket: find out whether we need that packet
1110 *****************************************************************************/
1111 static __inline__ void input_SortPacket( input_thread_t *p_input,
1112 ts_packet_t *p_ts_packet )
1117 /* Verify that sync_byte, error_indicator and scrambling_control are
1118 what we expected. */
1119 if( !(p_ts_packet->buffer[0] == 0x47) || (p_ts_packet->buffer[1] & 0x80) ||
1120 (p_ts_packet->buffer[3] & 0xc0) )
1122 intf_DbgMsg("input debug: invalid TS header (%p)\n", p_ts_packet);
1126 /* Get the PID of the packet. Note that ntohs is needed, for endianness
1127 purposes (see man page). */
1128 i_current_pid = U16_AT(&p_ts_packet->buffer[1]) & 0x1fff;
1130 //intf_DbgMsg("input debug: pid %d received (%p)\n",
1131 // i_current_pid, p_ts_packet);
1133 /* Lock current ES state. */
1134 vlc_mutex_lock( &p_input->es_lock );
1136 /* Verify that we actually want this PID. */
1137 for( i_es_loop = 0; i_es_loop < INPUT_MAX_SELECTED_ES; i_es_loop++ )
1139 if( p_input->pp_selected_es[i_es_loop] != NULL)
1141 if( (*p_input->pp_selected_es[i_es_loop]).i_id
1144 /* Don't need the lock anymore, since the value pointed
1145 out by p_input->pp_selected_es[i_es_loop] can only be
1146 modified from inside the input_thread (by the PSI
1147 decoder): interface thread is only allowed to modify
1148 the pp_selected_es table */
1149 vlc_mutex_unlock( &p_input->es_lock );
1151 /* We're interested. Pass it to the demultiplexer. */
1152 input_DemuxTS( p_input, p_ts_packet,
1153 p_input->pp_selected_es[i_es_loop] );
1159 /* pp_selected_es should not contain any hole. */
1163 vlc_mutex_unlock( &p_input->es_lock );
1166 /* We weren't interested in receiving this packet. Give it back to the
1168 //intf_DbgMsg("SortPacket: freeing unwanted TS %p (pid %d)\n", p_ts_packet,
1169 // U16_AT(&p_ts_packet->buffer[1]) & 0x1fff);
1170 input_NetlistFreeTS( p_input, p_ts_packet );
1172 p_input->c_packets_trashed++;
1176 /*****************************************************************************
1177 * input_ReadPacket: reads a packet from the network or the file
1178 *****************************************************************************/
1179 static __inline__ int input_ReadPacket( input_thread_t *p_input )
1181 int i_base_index; /* index of the first free iovec */
1182 int i_current_index;
1184 #ifdef INPUT_LIFO_TS_NETLIST
1185 int i_meanwhile_released;
1186 int i_currently_removed;
1188 ts_packet_t * p_ts_packet;
1190 /* In this function, we only care about the TS netlist. PES netlist
1191 * is for the demultiplexer. */
1192 #ifdef INPUT_LIFO_TS_NETLIST
1193 i_base_index = p_input->netlist.i_ts_index;
1195 /* Verify that we still have packets in the TS netlist */
1196 if( (INPUT_MAX_TS + INPUT_TS_READ_ONCE - 1 - p_input->netlist.i_ts_index) <= INPUT_TS_READ_ONCE )
1198 intf_ErrMsg("input error: TS netlist is empty !\n");
1202 #else /* FIFO netlist */
1203 i_base_index = p_input->netlist.i_ts_start;
1204 if( p_input->netlist.i_ts_start + INPUT_TS_READ_ONCE -1 > INPUT_MAX_TS )
1206 /* The netlist is split in 2 parts. We must gather them to consolidate
1207 the FIFO (we make the loop easily in having the same iovec at the far
1208 end and in the beginning of netlist_free).
1209 That's why the netlist is (INPUT_MAX_TS +1) + (INPUT_TS_READ_ONCE -1)
1211 memcpy( p_input->netlist.p_ts_free + INPUT_MAX_TS + 1,
1212 p_input->netlist.p_ts_free,
1213 (p_input->netlist.i_ts_start + INPUT_TS_READ_ONCE - 1 - INPUT_MAX_TS)
1214 * sizeof(struct iovec) );
1217 /* Verify that we still have packets in the TS netlist */
1218 if( ((p_input->netlist.i_ts_end -1 - p_input->netlist.i_ts_start) & INPUT_MAX_TS) <= INPUT_TS_READ_ONCE )
1220 intf_ErrMsg("input error: TS netlist is empty !\n");
1223 #endif /* FIFO netlist */
1225 /* Scatter read the buffer. */
1226 i_packet_size = (*p_input->p_Read)( p_input,
1227 &p_input->netlist.p_ts_free[i_base_index],
1228 INPUT_TS_READ_ONCE );
1229 if( i_packet_size == (-1) )
1232 intf_DbgMsg("Read packet %d %p %d %d\n", i_base_index,
1233 &p_input->netlist.p_ts_free[i_base_index],
1234 p_input->netlist.i_ts_start,
1235 p_input->netlist.i_ts_end);
1237 intf_ErrMsg("input error: readv() failed (%s)\n", strerror(errno));
1241 if( i_packet_size == 0 )
1243 /* No packet has been received, so stop here. */
1247 /* Demultiplex the TS packets (1..INPUT_TS_READ_ONCE) received. */
1248 for( i_current_index = i_base_index;
1249 (i_packet_size -= TS_PACKET_SIZE) >= 0;
1252 /* BTW, something REALLY bad could happen if we receive packets with
1254 p_ts_packet = (ts_packet_t*)(p_input->netlist.p_ts_free[i_current_index].iov_base);
1255 /* Don't cry :-), we are allowed to do that cast, because initially,
1256 our buffer was malloc'ed with sizeof(ts_packet_t) */
1258 /* Find out if we need this packet and demultiplex. */
1259 input_SortPacket( p_input /* for current PIDs and netlist */,
1263 if( i_packet_size > 0 )
1265 intf_ErrMsg("input error: wrong size\n");
1269 /* Remove the TS packets we have just filled from the netlist */
1270 #ifdef INPUT_LIFO_TS_NETLIST
1271 /* We need to take a lock here while we're calculating index positions. */
1272 vlc_mutex_lock( &p_input->netlist.lock );
1274 i_meanwhile_released = i_base_index - p_input->netlist.i_ts_index;
1275 if( i_meanwhile_released )
1277 /* That's where it becomes funny :-). Since we didn't take locks for
1278 efficiency reasons, other threads (including ourselves, with
1279 input_DemuxPacket) might have released packets to the netlist.
1280 So we have to copy these iovec where they should go.
1282 BTW, that explains why the TS netlist is
1283 (INPUT_MAX_TS +1) + (TS_READ_ONCE -1) large. */
1285 i_currently_removed = i_current_index - i_base_index;
1286 if( i_meanwhile_released < i_currently_removed )
1288 /* Copy all iovecs in that case */
1289 memcpy( &p_input->netlist.p_ts_free[p_input->netlist.i_ts_index]
1290 + i_currently_removed,
1291 &p_input->netlist.p_ts_free[p_input->netlist.i_ts_index],
1292 i_meanwhile_released * sizeof(struct iovec) );
1296 /* We have fewer places than items, so we only move
1297 i_currently_removed of them. */
1298 memcpy( &p_input->netlist.p_ts_free[i_base_index],
1299 &p_input->netlist.p_ts_free[p_input->netlist.i_ts_index],
1300 i_currently_removed * sizeof(struct iovec) );
1303 /* Update i_netlist_index with the information gathered above. */
1304 p_input->netlist.i_ts_index += i_currently_removed;
1308 /* Nothing happened. */
1309 p_input->netlist.i_ts_index = i_current_index;
1312 vlc_mutex_unlock( &p_input->netlist.lock );
1314 #else /* FIFO netlist */
1315 /* & is modulo ; that's where we make the loop. */
1316 p_input->netlist.i_ts_start = i_current_index & INPUT_MAX_TS;
1320 p_input->c_packets_read += i_current_index - i_base_index;
1321 p_input->c_bytes += (i_current_index - i_base_index) * TS_PACKET_SIZE;
1326 /*****************************************************************************
1327 * RunThread: main thread loop
1328 *****************************************************************************
1329 * Thread in charge of processing the network packets and demultiplexing.
1330 *****************************************************************************/
1331 static void RunThread( input_thread_t *p_input )
1334 * Initialize thread and free configuration
1336 p_input->b_error = InitThread( p_input );
1337 if( p_input->b_error )
1339 free( p_input ); /* destroy descriptor */
1347 while( !p_input->b_die && !p_input->b_error )
1349 /* Scatter read the UDP packet from the network or the file. */
1350 if( (input_ReadPacket( p_input )) == (-1) )
1352 /* FIXME??: Normally, a thread can't kill itself, but we don't have
1353 * any method in case of an error condition ... */
1354 p_input->b_error = 1;
1365 if( p_input->b_error )
1367 ErrorThread( p_input );
1371 EndThread( p_input );
1372 intf_DbgMsg("thread end\n");
1376 /*****************************************************************************
1377 * ErrorThread: RunThread() error loop
1378 *****************************************************************************
1379 * This function is called when an error occured during thread main's loop.
1380 *****************************************************************************/
1381 static void ErrorThread( input_thread_t *p_input )
1383 /* Wait until a `die' order */
1385 while( !p_input->b_die )
1388 msleep( VOUT_IDLE_SLEEP );
1392 /*****************************************************************************
1393 * EndThread: end the input thread
1394 *****************************************************************************/
1395 static void EndThread( input_thread_t * p_input )
1397 int * pi_status; /* threas status */
1398 int i_es_loop; /* es index */
1402 pi_status = p_input->pi_status;
1403 *pi_status = THREAD_END;
1406 intf_Msg("input stats: Done %d loops\n", p_input->c_loops);
1407 intf_Msg("input stats: Read %d bytes (payload : %d)\n", p_input->c_bytes,
1408 p_input->c_payload_bytes);
1409 intf_Msg("input stats: Read %d packets (trashed : %d)\n",
1410 p_input->c_packets_read, p_input->c_packets_trashed);
1413 /* Close input method */
1414 p_input->p_Close( p_input );
1416 /* Destroy all decoder threads */
1418 (i_es_loop < INPUT_MAX_ES) && (p_input->pp_selected_es[i_es_loop] != NULL) ;
1421 switch( p_input->pp_selected_es[i_es_loop]->i_type )
1423 case MPEG1_VIDEO_ES:
1424 case MPEG2_VIDEO_ES:
1425 vpar_DestroyThread( (vpar_thread_t*)(p_input->pp_selected_es[i_es_loop]->p_dec) /*, NULL */ );
1427 case MPEG1_AUDIO_ES:
1428 case MPEG2_AUDIO_ES:
1429 adec_DestroyThread( (adec_thread_t*)(p_input->pp_selected_es[i_es_loop]->p_dec) );
1432 ac3dec_DestroyThread( (ac3dec_thread_t *)(p_input->pp_selected_es[i_es_loop]->p_dec) );
1435 lpcmdec_DestroyThread((lpcmdec_thread_t *)(p_input->pp_selected_es[i_es_loop]->p_dec) );
1438 spudec_DestroyThread( (spudec_thread_t *)(p_input->pp_selected_es[i_es_loop]->p_dec) );
1441 /* Special streams for the PSI decoder, PID 0 and 1 */
1445 intf_DbgMsg("error: unknown decoder type %d\n", p_input->pp_selected_es[i_es_loop]->i_type );
1451 input_NetlistEnd( p_input ); /* clean netlist */
1452 input_PsiEnd( p_input ); /* clean PSI information */
1453 input_PcrEnd( p_input ); /* clean PCR information */
1454 free( p_input ); /* free input_thread structure */
1457 *pi_status = THREAD_OVER;