1 /*****************************************************************************
2 * input_ps.c: PS demux and packet management
3 *****************************************************************************
4 * Copyright (C) 1998, 1999, 2000 VideoLAN
5 * $Id: input_ps.c,v 1.20 2001/04/28 03:36:25 sam Exp $
7 * Authors: Christophe Massiot <massiot@via.ecp.fr>
8 * Cyril Deguet <asmax@via.ecp.fr>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
23 *****************************************************************************/
25 #define MODULE_NAME ps
26 #include "modules_inner.h"
28 /*****************************************************************************
30 *****************************************************************************/
35 #ifdef STRNCASECMP_IN_STRINGS_H
40 #include <sys/types.h>
55 #include "stream_control.h"
56 #include "input_ext-intf.h"
57 #include "input_ext-dec.h"
62 #include "mpeg_system.h"
68 /*****************************************************************************
70 *****************************************************************************/
71 static int PSProbe ( probedata_t * );
72 static int PSRead ( struct input_thread_s *,
73 data_packet_t * p_packets[INPUT_READ_ONCE] );
74 static void PSInit ( struct input_thread_s * );
75 static void PSEnd ( struct input_thread_s * );
76 static void PSSeek ( struct input_thread_s *, off_t );
77 static struct pes_packet_s * NewPES ( void * );
78 static struct data_packet_s * NewPacket ( void *, size_t );
79 static void DeletePacket( void *, struct data_packet_s * );
80 static void DeletePES ( void *, struct pes_packet_s * );
82 /*****************************************************************************
83 * Functions exported as capabilities. They are declared as static so that
84 * we don't pollute the namespace too much.
85 *****************************************************************************/
86 void _M( input_getfunctions )( function_list_t * p_function_list )
88 #define input p_function_list->functions.input
89 p_function_list->pf_probe = PSProbe;
90 input.pf_init = PSInit;
91 input.pf_open = input_FileOpen;
92 input.pf_close = input_FileClose;
94 input.pf_set_area = NULL;
95 input.pf_read = PSRead;
96 input.pf_demux = input_DemuxPS;
97 input.pf_new_packet = NewPacket;
98 input.pf_new_pes = NewPES;
99 input.pf_delete_packet = DeletePacket;
100 input.pf_delete_pes = DeletePES;
101 input.pf_rewind = NULL;
102 input.pf_seek = PSSeek;
107 * Data reading functions
110 /*****************************************************************************
111 * PSProbe: verifies that the stream is a PS stream
112 *****************************************************************************/
113 static int PSProbe( probedata_t *p_data )
115 input_thread_t * p_input = (input_thread_t *)p_data;
117 char * psz_name = p_input->p_source;
121 if( TestMethod( INPUT_METHOD_VAR, "ps" ) )
126 if( ( strlen(psz_name) > 5 ) && !strncasecmp( psz_name, "file:", 5 ) )
128 /* If the user specified "file:" then it's probably a file */
133 i_handle = open( psz_name, 0 );
143 /*****************************************************************************
144 * PSInit: initializes PS structures
145 *****************************************************************************/
146 static void PSInit( input_thread_t * p_input )
148 thread_ps_data_t * p_method;
149 packet_cache_t * p_packet_cache;
152 (thread_ps_data_t *)malloc( sizeof(thread_ps_data_t) )) == NULL )
154 intf_ErrMsg( "Out of memory" );
155 p_input->b_error = 1;
158 p_input->p_plugin_data = (void *)p_method;
160 /* creates the packet cache structure */
161 p_packet_cache = malloc( sizeof(packet_cache_t) );
162 if ( p_packet_cache == NULL )
164 intf_ErrMsg( "Out of memory" );
165 p_input->b_error = 1;
168 p_input->p_method_data = (void *)p_packet_cache;
170 /* allocates the data cache */
171 p_packet_cache->data.p_stack = malloc( DATA_CACHE_SIZE *
172 sizeof(data_packet_t*) );
173 if ( p_packet_cache->data.p_stack == NULL )
175 intf_ErrMsg( "Out of memory" );
176 p_input->b_error = 1;
179 p_packet_cache->data.l_index = 0;
181 /* allocates the PES cache */
182 p_packet_cache->pes.p_stack = malloc( PES_CACHE_SIZE *
183 sizeof(pes_packet_t*) );
184 if ( p_packet_cache->pes.p_stack == NULL )
186 intf_ErrMsg( "Out of memory" );
187 p_input->b_error = 1;
190 p_packet_cache->pes.l_index = 0;
192 /* allocates the small buffer cache */
193 p_packet_cache->small.p_stack = malloc( SMALL_CACHE_SIZE *
194 sizeof(packet_buffer_t) );
195 if ( p_packet_cache->small.p_stack == NULL )
197 intf_ErrMsg( "Out of memory" );
198 p_input->b_error = 1;
201 p_packet_cache->small.l_index = 0;
203 /* allocates the large buffer cache */
204 p_packet_cache->large.p_stack = malloc( LARGE_CACHE_SIZE *
205 sizeof(packet_buffer_t) );
206 if ( p_packet_cache->large.p_stack == NULL )
208 intf_ErrMsg( "Out of memory" );
209 p_input->b_error = 1;
212 p_packet_cache->large.l_index = 0;
214 /* Re-open the socket as a buffered FILE stream */
215 if( (p_method->stream = fdopen( p_input->i_handle, "r" )) == NULL )
217 intf_ErrMsg( "Cannot open file (%s)", strerror(errno) );
218 p_input->b_error = 1;
221 rewind( p_method->stream );
223 /* FIXME : detect if InitStream failed */
224 input_InitStream( p_input, sizeof( stream_ps_data_t ) );
225 input_AddProgram( p_input, 0, sizeof( stream_ps_data_t ) );
227 if( p_input->stream.b_seekable )
229 stream_ps_data_t * p_demux_data =
230 (stream_ps_data_t *)p_input->stream.pp_programs[0]->p_demux_data;
232 /* Pre-parse the stream to gather stream_descriptor_t. */
233 p_input->stream.pp_programs[0]->b_is_ok = 0;
234 p_demux_data->i_PSM_version = EMPTY_PSM_VERSION;
236 while( !p_input->b_die && !p_input->b_error
237 && !p_demux_data->b_has_PSM )
240 data_packet_t * pp_packets[INPUT_READ_ONCE];
242 i_result = PSRead( p_input, pp_packets );
246 vlc_mutex_lock( &p_input->stream.stream_lock );
247 p_input->stream.pp_programs[0]->b_is_ok = 1;
248 vlc_mutex_unlock( &p_input->stream.stream_lock );
253 p_input->b_error = 1;
257 for( i = 0; i < INPUT_READ_ONCE && pp_packets[i] != NULL; i++ )
259 /* FIXME: use i_p_config_t */
260 input_ParsePS( p_input, pp_packets[i] );
261 DeletePacket( p_input->p_method_data, pp_packets[i] );
265 if( p_input->stream.p_selected_area->i_tell >
266 INPUT_PREPARSE_LENGTH )
271 rewind( p_method->stream );
272 vlc_mutex_lock( &p_input->stream.stream_lock );
274 p_input->stream.i_method = INPUT_METHOD_FILE;
275 p_input->stream.p_selected_area->i_tell = 0;
277 if( p_demux_data->b_has_PSM )
279 /* (The PSM decoder will care about spawning the decoders) */
280 p_input->stream.pp_programs[0]->b_is_ok = 1;
285 /* (We have to do it ourselves) */
288 /* FIXME: we should do multiple passes in case an audio type
291 i_es < p_input->stream.pp_programs[0]->i_es_number;
294 #define p_es p_input->stream.pp_programs[0]->pp_es[i_es]
295 switch( p_es->i_type )
299 input_SelectES( p_input, p_es );
304 if( main_GetIntVariable( INPUT_CHANNEL_VAR, 0 )
305 == (p_es->i_id & 0x1F) )
306 switch( main_GetIntVariable( INPUT_AUDIO_VAR, 0 ) )
309 main_PutIntVariable( INPUT_AUDIO_VAR,
312 input_SelectES( p_input, p_es );
317 if( main_GetIntVariable( INPUT_CHANNEL_VAR, 0 )
318 == ((p_es->i_id & 0xF00) >> 8) )
319 switch( main_GetIntVariable( INPUT_AUDIO_VAR, 0 ) )
322 main_PutIntVariable( INPUT_AUDIO_VAR,
325 input_SelectES( p_input, p_es );
330 if( main_GetIntVariable( INPUT_SUBTITLE_VAR, -1 )
331 == ((p_es->i_id & 0x1F00) >> 8) )
333 input_SelectES( p_input, p_es );
346 input_DumpStream( p_input );
348 vlc_mutex_unlock( &p_input->stream.stream_lock );
352 /* The programs will be added when we read them. */
353 vlc_mutex_lock( &p_input->stream.stream_lock );
354 p_input->stream.i_method = INPUT_METHOD_FILE;
355 p_input->stream.pp_programs[0]->b_is_ok = 0;
356 vlc_mutex_unlock( &p_input->stream.stream_lock );
360 /*****************************************************************************
361 * PSEnd: frees unused data
362 *****************************************************************************/
363 static void PSEnd( input_thread_t * p_input )
365 free( p_input->p_plugin_data );
368 /*****************************************************************************
369 * SafeRead: reads a chunk of stream and correctly detects errors
370 *****************************************************************************/
371 static __inline__ int SafeRead( input_thread_t * p_input, byte_t * p_buffer,
374 thread_ps_data_t * p_method;
377 p_method = (thread_ps_data_t *)p_input->p_plugin_data;
378 while( fread( p_buffer, i_len, 1, p_method->stream ) != 1 )
380 if( feof( p_method->stream ) )
385 if( (i_error = ferror( p_method->stream )) )
387 intf_ErrMsg( "Read failed (%s)", strerror(i_error) );
391 vlc_mutex_lock( &p_input->stream.stream_lock );
392 p_input->stream.p_selected_area->i_tell += i_len;
393 vlc_mutex_unlock( &p_input->stream.stream_lock );
397 /*****************************************************************************
398 * PSRead: reads data packets
399 *****************************************************************************
400 * Returns -1 in case of error, 0 if everything went well, and 1 in case of
402 *****************************************************************************/
403 static int PSRead( input_thread_t * p_input,
404 data_packet_t * pp_packets[INPUT_READ_ONCE] )
407 data_packet_t * p_data;
408 size_t i_packet_size;
409 int i_packet, i_error;
410 thread_ps_data_t * p_method;
412 p_method = (thread_ps_data_t *)p_input->p_plugin_data;
414 memset( pp_packets, 0, INPUT_READ_ONCE * sizeof(data_packet_t *) );
415 for( i_packet = 0; i_packet < INPUT_READ_ONCE; i_packet++ )
417 /* Read what we believe to be a packet header. */
418 if( (i_error = SafeRead( p_input, p_header, 6 )) )
423 if( (U32_AT(p_header) & 0xFFFFFF00) != 0x100L )
425 /* This is not the startcode of a packet. Read the stream
426 * until we find one. */
427 u32 i_startcode = U32_AT(p_header);
432 /* It is common for MPEG-1 streams to pad with zeros
433 * (although it is forbidden by the recommendation), so
434 * don't bother everybody in this case. */
435 intf_WarnMsg( 1, "Garbage at input (%.8x)", i_startcode );
438 while( (i_startcode & 0xFFFFFF00) != 0x100L )
441 if( (i_dummy = getc( p_method->stream )) != EOF )
443 i_startcode |= i_dummy;
451 *(u32 *)p_header = U32_AT(&i_startcode);
452 if( (i_error = SafeRead( p_input, p_header + 4, 2 )) )
458 if( U32_AT(p_header) != 0x1BA )
460 /* That's the case for all packets, except pack header. */
461 i_packet_size = U16_AT(&p_header[4]);
466 if( (p_header[4] & 0xC0) == 0x40 )
471 else if( (p_header[4] & 0xF0) == 0x20 )
478 intf_ErrMsg( "Unable to determine stream type" );
483 /* Fetch a packet of the appropriate size. */
484 if( (p_data = NewPacket( p_input->p_method_data, i_packet_size + 6 ))
487 intf_ErrMsg( "Out of memory" );
491 /* Copy the header we already read. */
492 memcpy( p_data->p_buffer, p_header, 6 );
494 /* Read the remaining of the packet. */
495 if( i_packet_size && (i_error =
496 SafeRead( p_input, p_data->p_buffer + 6, i_packet_size )) )
501 /* In MPEG-2 pack headers we still have to read stuffing bytes. */
502 if( U32_AT(p_header) == 0x1BA )
504 if( i_packet_size == 8 && (p_data->p_buffer[13] & 0x7) != 0 )
506 /* MPEG-2 stuffing bytes */
508 if( (i_error = SafeRead( p_input, p_garbage,
509 p_data->p_buffer[13] & 0x7)) )
516 /* Give the packet to the other input stages. */
517 pp_packets[i_packet] = p_data;
523 /*****************************************************************************
524 * PSSeek: changes the stream position indicator
525 *****************************************************************************/
526 static void PSSeek( input_thread_t * p_input, off_t i_position )
528 thread_ps_data_t * p_method;
530 p_method = (thread_ps_data_t *)p_input->p_plugin_data;
532 /* A little bourrin but should work for a while --Meuuh */
534 fseeko( p_method->stream, i_position, SEEK_SET );
536 fseek( p_method->stream, (long)i_position, SEEK_SET );
539 p_input->stream.p_selected_area->i_tell = i_position;
543 * Packet management utilities
547 /*****************************************************************************
548 * NewPacket: allocates a data packet
549 *****************************************************************************/
550 static struct data_packet_s * NewPacket( void * p_packet_cache,
553 packet_cache_t * p_cache;
554 data_packet_t * p_data;
557 p_cache = (packet_cache_t *)p_packet_cache;
560 if ( p_cache == NULL )
562 intf_ErrMsg( "PPacket cache not initialized" );
568 if( l_size > INPUT_MAX_PACKET_SIZE )
570 intf_ErrMsg( "Packet too big (%d)", l_size );
574 /* Checks whether the data cache is empty */
575 if( p_cache->data.l_index == 0 )
577 /* Allocates a new packet */
578 if ( (p_data = malloc( sizeof(data_packet_t) )) == NULL )
580 intf_ErrMsg( "Out of memory" );
584 intf_DbgMsg( "PS input: data packet allocated" );
589 /* Takes the packet out from the cache */
590 if( (p_data = p_cache->data.p_stack[ -- p_cache->data.l_index ])
593 intf_ErrMsg( "NULL packet in the data cache" );
598 if( l_size < MAX_SMALL_SIZE )
602 /* Checks whether the buffer cache is empty */
603 if( p_cache->small.l_index == 0 )
605 /* Allocates a new packet */
606 if ( (p_data->p_buffer = malloc( l_size )) == NULL )
608 intf_DbgMsg( "Out of memory" );
613 intf_DbgMsg( "PS input: small buffer allocated" );
615 p_data->l_size = l_size;
619 /* Takes the packet out from the cache */
620 l_index = -- p_cache->small.l_index;
621 if( (p_data->p_buffer = p_cache->small.p_stack[l_index].p_data)
624 intf_ErrMsg( "NULL packet in the small buffer cache" );
628 /* Reallocates the packet if it is too small or too large */
629 if( p_cache->small.p_stack[l_index].l_size < l_size ||
630 p_cache->small.p_stack[l_index].l_size > 2*l_size )
632 p_data->p_buffer = realloc( p_data->p_buffer, l_size );
633 p_data->l_size = l_size;
637 p_data->l_size = p_cache->small.p_stack[l_index].l_size;
645 /* Checks whether the buffer cache is empty */
646 if( p_cache->large.l_index == 0 )
648 /* Allocates a new packet */
649 if ( (p_data->p_buffer = malloc( l_size )) == NULL )
651 intf_ErrMsg( "Out of memory" );
656 intf_DbgMsg( "PS input: large buffer allocated" );
658 p_data->l_size = l_size;
662 /* Takes the packet out from the cache */
663 l_index = -- p_cache->large.l_index;
664 if( (p_data->p_buffer = p_cache->large.p_stack[l_index].p_data)
667 intf_ErrMsg( "NULL packet in the small buffer cache" );
671 /* Reallocates the packet if it is too small or too large */
672 if( p_cache->large.p_stack[l_index].l_size < l_size ||
673 p_cache->large.p_stack[l_index].l_size > 2*l_size )
675 p_data->p_buffer = realloc( p_data->p_buffer, l_size );
676 p_data->l_size = l_size;
680 p_data->l_size = p_cache->large.p_stack[l_index].l_size;
685 /* Initialize data */
686 p_data->p_next = NULL;
687 p_data->b_discard_payload = 0;
688 p_data->p_payload_start = p_data->p_buffer;
689 p_data->p_payload_end = p_data->p_buffer + l_size;
696 /*****************************************************************************
697 * NewPES: allocates a pes packet
698 *****************************************************************************/
699 static pes_packet_t * NewPES( void * p_packet_cache )
701 packet_cache_t * p_cache;
702 pes_packet_t * p_pes;
704 p_cache = (packet_cache_t *)p_packet_cache;
707 if ( p_cache == NULL )
709 intf_ErrMsg( "Packet cache not initialized" );
714 /* Checks whether the PES cache is empty */
715 if( p_cache->pes.l_index == 0 )
717 /* Allocates a new packet */
718 if ( (p_pes = malloc( sizeof(pes_packet_t) )) == NULL )
720 intf_DbgMsg( "Out of memory" );
724 intf_DbgMsg( "PS input: PES packet allocated" );
729 /* Takes the packet out from the cache */
730 if( (p_pes = p_cache->pes.p_stack[ -- p_cache->pes.l_index ])
733 intf_ErrMsg( "NULL packet in the data cache" );
738 p_pes->b_data_alignment = p_pes->b_discontinuity =
739 p_pes->i_pts = p_pes->i_dts = 0;
740 p_pes->i_pes_size = 0;
741 p_pes->p_first = NULL;
747 /*****************************************************************************
748 * DeletePacket: deletes a data packet
749 *****************************************************************************/
750 static void DeletePacket( void * p_packet_cache,
751 data_packet_t * p_data )
753 packet_cache_t * p_cache;
755 p_cache = (packet_cache_t *)p_packet_cache;
758 if ( p_cache == NULL )
760 intf_ErrMsg( "Packet cache not initialized" );
767 /* Checks whether the data cache is full */
768 if ( p_cache->data.l_index < DATA_CACHE_SIZE )
770 /* Cache not full: store the packet in it */
771 p_cache->data.p_stack[ p_cache->data.l_index ++ ] = p_data;
772 /* Small buffer or large buffer? */
773 if ( p_data->l_size < MAX_SMALL_SIZE )
775 /* Checks whether the small buffer cache is full */
776 if ( p_cache->small.l_index < SMALL_CACHE_SIZE )
778 p_cache->small.p_stack[ p_cache->small.l_index ].l_size =
780 p_cache->small.p_stack[ p_cache->small.l_index ++ ].p_data =
785 ASSERT( p_data->p_buffer );
786 free( p_data->p_buffer );
788 intf_DbgMsg( "PS input: small buffer freed" );
794 /* Checks whether the large buffer cache is full */
795 if ( p_cache->large.l_index < LARGE_CACHE_SIZE )
797 p_cache->large.p_stack[ p_cache->large.l_index ].l_size =
799 p_cache->large.p_stack[ p_cache->large.l_index ++ ].p_data =
804 ASSERT( p_data->p_buffer );
805 free( p_data->p_buffer );
807 intf_DbgMsg( "PS input: large buffer freed" );
814 /* Cache full: the packet must be freed */
815 free( p_data->p_buffer );
818 intf_DbgMsg( "PS input: data packet freed" );
824 /*****************************************************************************
825 * DeletePES: deletes a PES packet and associated data packets
826 *****************************************************************************/
827 static void DeletePES( void * p_packet_cache, pes_packet_t * p_pes )
829 packet_cache_t * p_cache;
830 data_packet_t * p_data;
831 data_packet_t * p_next;
833 p_cache = (packet_cache_t *)p_packet_cache;
836 if ( p_cache == NULL )
838 intf_ErrMsg( "Packet cache not initialized" );
845 p_data = p_pes->p_first;
847 while( p_data != NULL )
849 p_next = p_data->p_next;
850 DeletePacket( p_cache, p_data );
854 /* Checks whether the PES cache is full */
855 if ( p_cache->pes.l_index < PES_CACHE_SIZE )
857 /* Cache not full: store the packet in it */
858 p_cache->pes.p_stack[ p_cache->pes.l_index ++ ] = p_pes;
862 /* Cache full: the packet must be freed */
865 intf_DbgMsg( "PS input: PES packet freed" );