1 /*****************************************************************************
3 *****************************************************************************
4 * Copyright (C) 1999-2004 VLC authors and VideoLAN
7 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU Lesser General Public License as published by
11 * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this program; if not, write to the Free Software Foundation,
21 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
31 #include <vlc_common.h>
32 #include <vlc_strings.h>
33 #include <vlc_memory.h>
40 #include "input_internal.h"
42 // #define STREAM_DEBUG 1
45 * - tune the 2 methods (block/stream)
46 * - compute cost for seek
47 * - improve stream mode seeking with closest segments
53 * One linked list of data read
55 * More complex scheme using mutliple track to avoid seeking
56 * - using directly the access (only indirection for peeking).
57 * This method is known to introduce much less latency.
58 * It should probably defaulted (instead of the stream method (2)).
61 /* How many tracks we have, currently only used for stream mode */
62 #ifdef OPTIMIZE_MEMORY
63 # define STREAM_CACHE_TRACK 1
64 /* Max size of our cache 128Ko per track */
65 # define STREAM_CACHE_SIZE (STREAM_CACHE_TRACK*1024*128)
67 # define STREAM_CACHE_TRACK 3
68 /* Max size of our cache 4Mo per track */
69 # define STREAM_CACHE_SIZE (4*STREAM_CACHE_TRACK*1024*1024)
72 /* How many data we try to prebuffer
73 * XXX it should be small to avoid useless latency but big enough for
74 * efficient demux probing */
75 #define STREAM_CACHE_PREBUFFER_SIZE (128)
77 /* Method1: Simple, for pf_block.
78 * We get blocks and put them in the linked list.
79 * We release blocks once the total size is bigger than CACHE_BLOCK_SIZE
82 /* Method2: A bit more complex, for pf_read
83 * - We use ring buffers, only one if unseekable, all if seekable
84 * - Upon seek date current ring, then search if one ring match the pos,
85 * yes: switch to it, seek the access to match the end of the ring
86 * no: search the ring with i_end the closer to i_pos,
87 * if close enough, read data and use this ring
88 * else use the oldest ring, seek and use it.
90 * TODO: - with access non seekable: use all space available for only one ring, but
91 * we have to support seekable/non-seekable switch on the fly.
92 * - compute a good value for i_read_size
95 #define STREAM_READ_ATONCE 1024
96 #define STREAM_CACHE_TRACK_SIZE (STREAM_CACHE_SIZE/STREAM_CACHE_TRACK)
120 } stream_read_method_t;
126 stream_read_method_t method; /* method to use */
128 uint64_t i_pos; /* Current reading offset */
130 /* Method 1: pf_block */
133 uint64_t i_start; /* Offset of block for p_first */
134 uint64_t i_offset; /* Offset for data in p_current */
135 block_t *p_current; /* Current block */
137 uint64_t i_size; /* Total amount of data in the list */
143 /* Method 2: for pf_read */
146 unsigned i_offset; /* Buffer offset in the current track */
147 int i_tk; /* Current track */
148 stream_track_t tk[STREAM_CACHE_TRACK];
154 unsigned i_used; /* Used since last read */
155 unsigned i_read_size;
159 /* Peek temporary buffer */
163 /* Stat for both method */
166 bool b_fastseek; /* From access */
168 /* Stat about reading data */
169 uint64_t i_read_count;
171 uint64_t i_read_time;
173 /* Stat about seek */
174 unsigned i_seek_count;
175 uint64_t i_seek_time;
181 access_entry_t **list;
183 access_t *p_list_access;
187 static int AStreamReadBlock( stream_t *s, void *p_read, unsigned int i_read );
188 static int AStreamPeekBlock( stream_t *s, const uint8_t **p_peek, unsigned int i_read );
189 static int AStreamSeekBlock( stream_t *s, uint64_t i_pos );
190 static void AStreamPrebufferBlock( stream_t *s );
191 static block_t *AReadBlock( stream_t *s, bool *pb_eof );
194 static int AStreamReadStream( stream_t *s, void *p_read, unsigned int i_read );
195 static int AStreamPeekStream( stream_t *s, const uint8_t **pp_peek, unsigned int i_read );
196 static int AStreamSeekStream( stream_t *s, uint64_t i_pos );
197 static void AStreamPrebufferStream( stream_t *s );
198 static int AReadStream( stream_t *s, void *p_read, unsigned int i_read );
201 static int AStreamControl( stream_t *s, int i_query, va_list );
202 static void AStreamDestroy( stream_t *s );
203 static int ASeek( stream_t *s, uint64_t i_pos );
205 /****************************************************************************
206 * stream_CommonNew: create an empty stream structure
207 ****************************************************************************/
208 stream_t *stream_CommonNew( vlc_object_t *p_obj )
210 stream_t *s = (stream_t *)vlc_custom_create( p_obj, sizeof(*s), "stream" );
215 s->p_text = malloc( sizeof(*s->p_text) );
218 vlc_object_release( s );
222 /* UTF16 and UTF32 text file conversion */
223 s->p_text->conv = (vlc_iconv_t)(-1);
224 s->p_text->i_char_width = 1;
225 s->p_text->b_little_endian = false;
230 void stream_CommonDelete( stream_t *s )
234 if( s->p_text->conv != (vlc_iconv_t)(-1) )
235 vlc_iconv_close( s->p_text->conv );
238 free( s->psz_access );
240 vlc_object_release( s );
244 /****************************************************************************
245 * stream_UrlNew: create a stream from a access
246 ****************************************************************************/
247 stream_t *stream_UrlNew( vlc_object_t *p_parent, const char *psz_url )
249 const char *psz_access, *psz_demux, *psz_path, *psz_anchor;
255 char psz_dup[strlen( psz_url ) + 1];
256 strcpy( psz_dup, psz_url );
257 input_SplitMRL( &psz_access, &psz_demux, &psz_path, &psz_anchor, psz_dup );
259 /* Now try a real access */
260 p_access = access_New( p_parent, NULL, psz_access, psz_demux, psz_path );
261 if( p_access == NULL )
263 msg_Err( p_parent, "no suitable access module for `%s'", psz_url );
267 return stream_AccessNew( p_access, NULL );
270 stream_t *stream_AccessNew( access_t *p_access, char **ppsz_list )
272 stream_t *s = stream_CommonNew( VLC_OBJECT(p_access) );
278 s->p_input = p_access->p_input;
279 s->psz_access = strdup( p_access->psz_access );
280 s->psz_path = strdup( p_access->psz_location );
281 s->p_sys = p_sys = malloc( sizeof( *p_sys ) );
282 if( !s->psz_access || !s->psz_path || !s->p_sys )
284 stream_CommonDelete( s );
288 s->pf_read = NULL; /* Set up later */
290 s->pf_control = AStreamControl;
291 s->pf_destroy = AStreamDestroy;
294 p_sys->p_access = p_access;
295 if( p_access->pf_block )
296 p_sys->method = STREAM_METHOD_BLOCK;
298 p_sys->method = STREAM_METHOD_STREAM;
300 p_sys->i_pos = p_access->info.i_pos;
303 access_Control( p_access, ACCESS_CAN_FASTSEEK, &p_sys->stat.b_fastseek );
304 p_sys->stat.i_bytes = 0;
305 p_sys->stat.i_read_time = 0;
306 p_sys->stat.i_read_count = 0;
307 p_sys->stat.i_seek_count = 0;
308 p_sys->stat.i_seek_time = 0;
310 TAB_INIT( p_sys->i_list, p_sys->list );
311 p_sys->i_list_index = 0;
312 p_sys->p_list_access = NULL;
314 /* Get the additional list of inputs if any (for concatenation) */
315 if( ppsz_list && ppsz_list[0] )
317 access_entry_t *p_entry = malloc( sizeof(*p_entry) );
321 p_entry->i_size = p_access->info.i_size;
322 p_entry->psz_path = strdup( p_access->psz_location );
323 if( !p_entry->psz_path )
328 p_sys->p_list_access = p_access;
329 TAB_APPEND( p_sys->i_list, p_sys->list, p_entry );
330 msg_Dbg( p_access, "adding file `%s', (%"PRId64" bytes)",
331 p_entry->psz_path, p_access->info.i_size );
333 for( int i = 0; ppsz_list[i] != NULL; i++ )
335 char *psz_name = strdup( ppsz_list[i] );
340 access_t *p_tmp = access_New( p_access, p_access->p_input,
341 p_access->psz_access, "", psz_name );
345 msg_Dbg( p_access, "adding file `%s', (%"PRId64" bytes)",
346 psz_name, p_tmp->info.i_size );
348 p_entry = malloc( sizeof(*p_entry) );
351 p_entry->i_size = p_tmp->info.i_size;
352 p_entry->psz_path = psz_name;
353 TAB_APPEND( p_sys->i_list, p_sys->list, p_entry );
355 access_Delete( p_tmp );
361 p_sys->p_peek = NULL;
363 if( p_sys->method == STREAM_METHOD_BLOCK )
365 msg_Dbg( s, "Using block method for AStream*" );
366 s->pf_read = AStreamReadBlock;
367 s->pf_peek = AStreamPeekBlock;
369 /* Init all fields of p_sys->block */
370 p_sys->block.i_start = p_sys->i_pos;
371 p_sys->block.i_offset = 0;
372 p_sys->block.p_current = NULL;
373 p_sys->block.i_size = 0;
374 p_sys->block.p_first = NULL;
375 p_sys->block.pp_last = &p_sys->block.p_first;
377 /* Do the prebuffering */
378 AStreamPrebufferBlock( s );
380 if( p_sys->block.i_size <= 0 )
382 msg_Err( s, "cannot pre fill buffer" );
390 assert( p_sys->method == STREAM_METHOD_STREAM );
392 msg_Dbg( s, "Using stream method for AStream*" );
394 s->pf_read = AStreamReadStream;
395 s->pf_peek = AStreamPeekStream;
397 /* Allocate/Setup our tracks */
398 p_sys->stream.i_offset = 0;
399 p_sys->stream.i_tk = 0;
400 p_sys->stream.p_buffer = malloc( STREAM_CACHE_SIZE );
401 if( p_sys->stream.p_buffer == NULL )
403 p_sys->stream.i_used = 0;
404 p_sys->stream.i_read_size = STREAM_READ_ATONCE;
405 #if STREAM_READ_ATONCE < 256
406 # error "Invalid STREAM_READ_ATONCE value"
409 for( i = 0; i < STREAM_CACHE_TRACK; i++ )
411 p_sys->stream.tk[i].i_date = 0;
412 p_sys->stream.tk[i].i_start = p_sys->i_pos;
413 p_sys->stream.tk[i].i_end = p_sys->i_pos;
414 p_sys->stream.tk[i].p_buffer=
415 &p_sys->stream.p_buffer[i * STREAM_CACHE_TRACK_SIZE];
418 /* Do the prebuffering */
419 AStreamPrebufferStream( s );
421 if( p_sys->stream.tk[p_sys->stream.i_tk].i_end <= 0 )
423 msg_Err( s, "cannot pre fill buffer" );
431 if( p_sys->method == STREAM_METHOD_BLOCK )
437 free( p_sys->stream.p_buffer );
439 while( p_sys->i_list > 0 )
440 free( p_sys->list[--(p_sys->i_list)] );
443 stream_CommonDelete( s );
444 access_Delete( p_access );
448 /****************************************************************************
450 ****************************************************************************/
451 static void AStreamDestroy( stream_t *s )
453 stream_sys_t *p_sys = s->p_sys;
455 if( p_sys->method == STREAM_METHOD_BLOCK )
456 block_ChainRelease( p_sys->block.p_first );
458 free( p_sys->stream.p_buffer );
460 free( p_sys->p_peek );
462 if( p_sys->p_list_access && p_sys->p_list_access != p_sys->p_access )
463 access_Delete( p_sys->p_list_access );
465 while( p_sys->i_list-- )
467 free( p_sys->list[p_sys->i_list]->psz_path );
468 free( p_sys->list[p_sys->i_list] );
472 stream_CommonDelete( s );
473 access_Delete( p_sys->p_access );
477 /****************************************************************************
478 * AStreamControlReset:
479 ****************************************************************************/
480 static void AStreamControlReset( stream_t *s )
482 stream_sys_t *p_sys = s->p_sys;
484 p_sys->i_pos = p_sys->p_access->info.i_pos;
486 if( p_sys->method == STREAM_METHOD_BLOCK )
488 block_ChainRelease( p_sys->block.p_first );
490 /* Init all fields of p_sys->block */
491 p_sys->block.i_start = p_sys->i_pos;
492 p_sys->block.i_offset = 0;
493 p_sys->block.p_current = NULL;
494 p_sys->block.i_size = 0;
495 p_sys->block.p_first = NULL;
496 p_sys->block.pp_last = &p_sys->block.p_first;
498 /* Do the prebuffering */
499 AStreamPrebufferBlock( s );
505 assert( p_sys->method == STREAM_METHOD_STREAM );
507 /* Setup our tracks */
508 p_sys->stream.i_offset = 0;
509 p_sys->stream.i_tk = 0;
510 p_sys->stream.i_used = 0;
512 for( i = 0; i < STREAM_CACHE_TRACK; i++ )
514 p_sys->stream.tk[i].i_date = 0;
515 p_sys->stream.tk[i].i_start = p_sys->i_pos;
516 p_sys->stream.tk[i].i_end = p_sys->i_pos;
519 /* Do the prebuffering */
520 AStreamPrebufferStream( s );
524 /****************************************************************************
525 * AStreamControlUpdate:
526 ****************************************************************************/
527 static void AStreamControlUpdate( stream_t *s )
529 stream_sys_t *p_sys = s->p_sys;
531 p_sys->i_pos = p_sys->p_access->info.i_pos;
536 for( i = 0; i < p_sys->i_list_index; i++ )
538 p_sys->i_pos += p_sys->list[i]->i_size;
543 /****************************************************************************
545 ****************************************************************************/
546 static int AStreamControl( stream_t *s, int i_query, va_list args )
548 stream_sys_t *p_sys = s->p_sys;
549 access_t *p_access = p_sys->p_access;
551 uint64_t *pi_64, i_64;
556 case STREAM_GET_SIZE:
557 pi_64 = va_arg( args, uint64_t * );
558 if( s->p_sys->i_list )
562 for( i = 0; i < s->p_sys->i_list; i++ )
563 *pi_64 += s->p_sys->list[i]->i_size;
566 *pi_64 = p_access->info.i_size;
569 case STREAM_CAN_SEEK:
570 return access_vaControl( p_access, ACCESS_CAN_SEEK, args );
571 case STREAM_CAN_FASTSEEK:
572 return access_vaControl( p_access, ACCESS_CAN_FASTSEEK, args );
573 case STREAM_CAN_PAUSE:
574 return access_vaControl( p_access, ACCESS_CAN_PAUSE, args );
575 case STREAM_CAN_CONTROL_PACE:
576 return access_vaControl( p_access, ACCESS_CAN_CONTROL_PACE, args );
578 case STREAM_GET_POSITION:
579 pi_64 = va_arg( args, uint64_t * );
580 *pi_64 = p_sys->i_pos;
583 case STREAM_SET_POSITION:
584 i_64 = va_arg( args, uint64_t );
585 switch( p_sys->method )
587 case STREAM_METHOD_BLOCK:
588 return AStreamSeekBlock( s, i_64 );
589 case STREAM_METHOD_STREAM:
590 return AStreamSeekStream( s, i_64 );
596 case STREAM_CONTROL_ACCESS:
598 i_int = (int) va_arg( args, int );
599 if( i_int != ACCESS_SET_PRIVATE_ID_STATE &&
600 i_int != ACCESS_SET_PRIVATE_ID_CA &&
601 i_int != ACCESS_GET_PRIVATE_ID_STATE &&
602 i_int != ACCESS_SET_TITLE &&
603 i_int != ACCESS_SET_SEEKPOINT )
605 msg_Err( s, "Hey, what are you thinking ?"
606 "DON'T USE STREAM_CONTROL_ACCESS !!!" );
609 int i_ret = access_vaControl( p_access, i_int, args );
610 if( i_int == ACCESS_SET_TITLE || i_int == ACCESS_SET_SEEKPOINT )
611 AStreamControlReset( s );
615 case STREAM_UPDATE_SIZE:
616 AStreamControlUpdate( s );
619 case STREAM_GET_CONTENT_TYPE:
620 return access_vaControl( p_access, ACCESS_GET_CONTENT_TYPE, args );
622 case STREAM_SET_PAUSE_STATE:
623 return access_vaControl( p_access, ACCESS_SET_PAUSE_STATE, args );
625 case STREAM_SET_RECORD_STATE:
627 msg_Err( s, "invalid stream_vaControl query=0x%x", i_query );
633 /****************************************************************************
635 ****************************************************************************/
636 static void AStreamPrebufferBlock( stream_t *s )
638 stream_sys_t *p_sys = s->p_sys;
643 msg_Dbg( s, "starting pre-buffering" );
647 const int64_t i_date = mdate();
651 if( !vlc_object_alive(s) || p_sys->block.i_size > STREAM_CACHE_PREBUFFER_SIZE )
656 p_sys->stat.i_bytes = p_sys->block.i_size;
657 p_sys->stat.i_read_time = i_date - i_start;
658 i_byterate = ( INT64_C(1000000) * p_sys->stat.i_bytes ) /
659 (p_sys->stat.i_read_time + 1);
661 msg_Dbg( s, "prebuffering done %"PRId64" bytes in %"PRId64"s - "
664 p_sys->stat.i_read_time / INT64_C(1000000),
670 if( ( b = AReadBlock( s, &b_eof ) ) == NULL )
679 /* Append the block */
680 p_sys->block.i_size += b->i_buffer;
681 *p_sys->block.pp_last = b;
682 p_sys->block.pp_last = &b->p_next;
684 p_sys->stat.i_read_count++;
691 msg_Dbg( s, "received first data after %d ms",
692 (int)((i_first-i_start)/1000) );
696 p_sys->block.p_current = p_sys->block.p_first;
699 static int AStreamRefillBlock( stream_t *s );
701 static int AStreamReadBlock( stream_t *s, void *p_read, unsigned int i_read )
703 stream_sys_t *p_sys = s->p_sys;
705 uint8_t *p_data = p_read;
706 unsigned int i_data = 0;
709 if( p_sys->block.p_current == NULL )
714 /* seek within this stream if possible, else use plain old read and discard */
715 stream_sys_t *p_sys = s->p_sys;
716 access_t *p_access = p_sys->p_access;
718 access_Control( p_access, ACCESS_CAN_SEEK, &b_aseek );
720 return AStreamSeekBlock( s, p_sys->i_pos + i_read ) ? 0 : i_read;
723 while( i_data < i_read )
726 p_sys->block.p_current->i_buffer - p_sys->block.i_offset;
727 unsigned int i_copy = VLC_CLIP( (unsigned int)i_current, 0, i_read - i_data);
733 &p_sys->block.p_current->p_buffer[p_sys->block.i_offset],
739 p_sys->block.i_offset += i_copy;
740 if( p_sys->block.i_offset >= p_sys->block.p_current->i_buffer )
742 /* Current block is now empty, switch to next */
743 if( p_sys->block.p_current )
745 p_sys->block.i_offset = 0;
746 p_sys->block.p_current = p_sys->block.p_current->p_next;
748 /*Get a new block if needed */
749 if( !p_sys->block.p_current && AStreamRefillBlock( s ) )
756 p_sys->i_pos += i_data;
760 static int AStreamPeekBlock( stream_t *s, const uint8_t **pp_peek, unsigned int i_read )
762 stream_sys_t *p_sys = s->p_sys;
764 unsigned int i_data = 0;
766 unsigned int i_offset;
768 if( p_sys->block.p_current == NULL ) return 0; /* EOF */
770 /* We can directly give a pointer over our buffer */
771 if( i_read <= p_sys->block.p_current->i_buffer - p_sys->block.i_offset )
773 *pp_peek = &p_sys->block.p_current->p_buffer[p_sys->block.i_offset];
777 /* We need to create a local copy */
778 if( p_sys->i_peek < i_read )
780 p_sys->p_peek = realloc_or_free( p_sys->p_peek, i_read );
786 p_sys->i_peek = i_read;
789 /* Fill enough data */
790 while( p_sys->block.i_size - (p_sys->i_pos - p_sys->block.i_start)
793 block_t **pp_last = p_sys->block.pp_last;
795 if( AStreamRefillBlock( s ) ) break;
797 /* Our buffer are probably filled enough, don't try anymore */
798 if( pp_last == p_sys->block.pp_last ) break;
801 /* Copy what we have */
802 b = p_sys->block.p_current;
803 i_offset = p_sys->block.i_offset;
804 p_data = p_sys->p_peek;
806 while( b && i_data < i_read )
808 unsigned int i_current = __MAX(b->i_buffer - i_offset,0);
809 int i_copy = __MIN( i_current, i_read - i_data );
811 memcpy( p_data, &b->p_buffer[i_offset], i_copy );
816 if( i_offset >= b->i_buffer )
823 *pp_peek = p_sys->p_peek;
827 static int AStreamSeekBlock( stream_t *s, uint64_t i_pos )
829 stream_sys_t *p_sys = s->p_sys;
830 access_t *p_access = p_sys->p_access;
831 int64_t i_offset = i_pos - p_sys->block.i_start;
834 /* We already have thoses data, just update p_current/i_offset */
835 if( i_offset >= 0 && (uint64_t)i_offset < p_sys->block.i_size )
837 block_t *b = p_sys->block.p_first;
840 while( i_current + b->i_buffer < (uint64_t)i_offset )
842 i_current += b->i_buffer;
846 p_sys->block.p_current = b;
847 p_sys->block.i_offset = i_offset - i_current;
849 p_sys->i_pos = i_pos;
854 /* We may need to seek or to read data */
858 access_Control( p_access, ACCESS_CAN_SEEK, &b_aseek );
862 msg_Err( s, "backward seeking impossible (access not seekable)" );
870 bool b_aseek, b_aseekfast;
872 access_Control( p_access, ACCESS_CAN_SEEK, &b_aseek );
873 access_Control( p_access, ACCESS_CAN_FASTSEEK, &b_aseekfast );
878 msg_Warn( s, "%"PRId64" bytes need to be skipped "
879 "(access non seekable)",
880 i_offset - p_sys->block.i_size );
884 int64_t i_skip = i_offset - p_sys->block.i_size;
886 /* Avg bytes per packets */
887 int i_avg = p_sys->stat.i_bytes / p_sys->stat.i_read_count;
888 /* TODO compute a seek cost instead of fixed threshold */
889 int i_th = b_aseekfast ? 1 : 5;
891 if( i_skip <= i_th * i_avg &&
892 i_skip < STREAM_CACHE_SIZE )
897 msg_Dbg( s, "b_seek=%d th*avg=%d skip=%"PRId64,
898 b_seek, i_th*i_avg, i_skip );
904 int64_t i_start, i_end;
905 /* Do the access seek */
907 if( ASeek( s, i_pos ) ) return VLC_EGENERIC;
911 block_ChainRelease( p_sys->block.p_first );
914 p_sys->block.i_start = p_sys->i_pos = i_pos;
915 p_sys->block.i_offset = 0;
916 p_sys->block.p_current = NULL;
917 p_sys->block.i_size = 0;
918 p_sys->block.p_first = NULL;
919 p_sys->block.pp_last = &p_sys->block.p_first;
922 if( AStreamRefillBlock( s ) )
926 p_sys->stat.i_seek_time += i_end - i_start;
927 p_sys->stat.i_seek_count++;
934 while( p_sys->block.p_current &&
935 p_sys->i_pos + p_sys->block.p_current->i_buffer - p_sys->block.i_offset <= i_pos )
937 p_sys->i_pos += p_sys->block.p_current->i_buffer - p_sys->block.i_offset;
938 p_sys->block.p_current = p_sys->block.p_current->p_next;
939 p_sys->block.i_offset = 0;
941 if( !p_sys->block.p_current && AStreamRefillBlock( s ) )
943 if( p_sys->i_pos != i_pos )
947 while( p_sys->block.i_start + p_sys->block.i_size < i_pos );
949 p_sys->block.i_offset += i_pos - p_sys->i_pos;
950 p_sys->i_pos = i_pos;
958 static int AStreamRefillBlock( stream_t *s )
960 stream_sys_t *p_sys = s->p_sys;
964 while( p_sys->block.i_size >= STREAM_CACHE_SIZE &&
965 p_sys->block.p_first != p_sys->block.p_current )
967 block_t *b = p_sys->block.p_first;
969 p_sys->block.i_start += b->i_buffer;
970 p_sys->block.i_size -= b->i_buffer;
971 p_sys->block.p_first = b->p_next;
975 if( p_sys->block.i_size >= STREAM_CACHE_SIZE &&
976 p_sys->block.p_current == p_sys->block.p_first &&
977 p_sys->block.p_current->p_next ) /* At least 2 packets */
979 /* Enough data, don't read more */
983 /* Now read a new block */
984 const int64_t i_start = mdate();
989 if( !vlc_object_alive(s) )
993 if( ( b = AReadBlock( s, &b_eof ) ) )
999 p_sys->stat.i_read_time += mdate() - i_start;
1002 /* Append the block */
1003 p_sys->block.i_size += b->i_buffer;
1004 *p_sys->block.pp_last = b;
1005 p_sys->block.pp_last = &b->p_next;
1008 if( p_sys->block.p_current == NULL )
1009 p_sys->block.p_current = b;
1012 p_sys->stat.i_bytes += b->i_buffer;
1013 p_sys->stat.i_read_count++;
1021 /****************************************************************************
1023 ****************************************************************************/
1024 static int AStreamRefillStream( stream_t *s );
1025 static int AStreamReadNoSeekStream( stream_t *s, void *p_read, unsigned int i_read );
1027 static int AStreamReadStream( stream_t *s, void *p_read, unsigned int i_read )
1029 stream_sys_t *p_sys = s->p_sys;
1033 const uint64_t i_pos_wanted = p_sys->i_pos + i_read;
1035 if( AStreamSeekStream( s, i_pos_wanted ) )
1037 if( p_sys->i_pos != i_pos_wanted )
1042 return AStreamReadNoSeekStream( s, p_read, i_read );
1045 static int AStreamPeekStream( stream_t *s, const uint8_t **pp_peek, unsigned int i_read )
1047 stream_sys_t *p_sys = s->p_sys;
1048 stream_track_t *tk = &p_sys->stream.tk[p_sys->stream.i_tk];
1051 if( tk->i_start >= tk->i_end ) return 0; /* EOF */
1054 msg_Dbg( s, "AStreamPeekStream: %d pos=%"PRId64" tk=%d "
1055 "start=%"PRId64" offset=%d end=%"PRId64,
1056 i_read, p_sys->i_pos, p_sys->stream.i_tk,
1057 tk->i_start, p_sys->stream.i_offset, tk->i_end );
1060 /* Avoid problem, but that should *never* happen */
1061 if( i_read > STREAM_CACHE_TRACK_SIZE / 2 )
1062 i_read = STREAM_CACHE_TRACK_SIZE / 2;
1064 while( tk->i_end < tk->i_start + p_sys->stream.i_offset + i_read )
1066 if( p_sys->stream.i_used <= 1 )
1068 /* Be sure we will read something */
1069 p_sys->stream.i_used += tk->i_start + p_sys->stream.i_offset + i_read - tk->i_end;
1071 if( AStreamRefillStream( s ) ) break;
1074 if( tk->i_end < tk->i_start + p_sys->stream.i_offset + i_read )
1076 i_read = tk->i_end - tk->i_start - p_sys->stream.i_offset;
1080 /* Now, direct pointer or a copy ? */
1081 i_off = (tk->i_start + p_sys->stream.i_offset) % STREAM_CACHE_TRACK_SIZE;
1082 if( i_off + i_read <= STREAM_CACHE_TRACK_SIZE )
1084 *pp_peek = &tk->p_buffer[i_off];
1088 if( p_sys->i_peek < i_read )
1090 p_sys->p_peek = realloc_or_free( p_sys->p_peek, i_read );
1091 if( !p_sys->p_peek )
1096 p_sys->i_peek = i_read;
1099 memcpy( p_sys->p_peek, &tk->p_buffer[i_off],
1100 STREAM_CACHE_TRACK_SIZE - i_off );
1101 memcpy( &p_sys->p_peek[STREAM_CACHE_TRACK_SIZE - i_off],
1102 &tk->p_buffer[0], i_read - (STREAM_CACHE_TRACK_SIZE - i_off) );
1104 *pp_peek = p_sys->p_peek;
1108 static int AStreamSeekStream( stream_t *s, uint64_t i_pos )
1110 stream_sys_t *p_sys = s->p_sys;
1112 stream_track_t *p_current = &p_sys->stream.tk[p_sys->stream.i_tk];
1113 access_t *p_access = p_sys->p_access;
1115 if( p_current->i_start >= p_current->i_end && i_pos >= p_current->i_end )
1119 msg_Dbg( s, "AStreamSeekStream: to %"PRId64" pos=%"PRId64
1120 " tk=%d start=%"PRId64" offset=%d end=%"PRId64,
1121 i_pos, p_sys->i_pos, p_sys->stream.i_tk,
1123 p_sys->stream.i_offset,
1128 access_Control( p_access, ACCESS_CAN_SEEK, &b_aseek );
1129 if( !b_aseek && i_pos < p_current->i_start )
1131 msg_Warn( s, "AStreamSeekStream: can't seek" );
1132 return VLC_EGENERIC;
1136 access_Control( p_access, ACCESS_CAN_FASTSEEK, &b_afastseek );
1138 /* FIXME compute seek cost (instead of static 'stupid' value) */
1139 uint64_t i_skip_threshold;
1141 i_skip_threshold = b_afastseek ? 128 : 3*p_sys->stream.i_read_size;
1143 i_skip_threshold = INT64_MAX;
1145 /* Date the current track */
1146 p_current->i_date = mdate();
1148 /* Search a new track slot */
1149 stream_track_t *tk = NULL;
1152 /* Prefer the current track */
1153 if( p_current->i_start <= i_pos && i_pos <= p_current->i_end + i_skip_threshold )
1156 i_tk_idx = p_sys->stream.i_tk;
1160 /* Try to maximize already read data */
1161 for( int i = 0; i < STREAM_CACHE_TRACK; i++ )
1163 stream_track_t *t = &p_sys->stream.tk[i];
1165 if( t->i_start > i_pos || i_pos > t->i_end )
1168 if( !tk || tk->i_end < t->i_end )
1177 /* Use the oldest unused */
1178 for( int i = 0; i < STREAM_CACHE_TRACK; i++ )
1180 stream_track_t *t = &p_sys->stream.tk[i];
1182 if( !tk || tk->i_date > t->i_date )
1189 assert( i_tk_idx >= 0 && i_tk_idx < STREAM_CACHE_TRACK );
1191 if( tk != p_current )
1192 i_skip_threshold = 0;
1193 if( tk->i_start <= i_pos && i_pos <= tk->i_end + i_skip_threshold )
1196 msg_Err( s, "AStreamSeekStream: reusing %d start=%"PRId64
1197 " end=%"PRId64"(%s)",
1198 i_tk_idx, tk->i_start, tk->i_end,
1199 tk != p_current ? "seek" : i_pos > tk->i_end ? "skip" : "noseek" );
1201 if( tk != p_current )
1205 /* Seek at the end of the buffer
1206 * TODO it is stupid to seek now, it would be better to delay it
1208 if( ASeek( s, tk->i_end ) )
1209 return VLC_EGENERIC;
1211 else if( i_pos > tk->i_end )
1213 uint64_t i_skip = i_pos - tk->i_end;
1216 const int i_read_max = __MIN( 10 * STREAM_READ_ATONCE, i_skip );
1217 if( AStreamReadNoSeekStream( s, NULL, i_read_max ) != i_read_max )
1218 return VLC_EGENERIC;
1219 i_skip -= i_read_max;
1226 msg_Err( s, "AStreamSeekStream: hard seek" );
1228 /* Nothing good, seek and choose oldest segment */
1229 if( ASeek( s, i_pos ) )
1230 return VLC_EGENERIC;
1232 tk->i_start = i_pos;
1235 p_sys->stream.i_offset = i_pos - tk->i_start;
1236 p_sys->stream.i_tk = i_tk_idx;
1237 p_sys->i_pos = i_pos;
1239 /* If there is not enough data left in the track, refill */
1240 /* TODO How to get a correct value for
1241 * - refilling threshold
1242 * - how much to refill
1244 if( tk->i_end < tk->i_start + p_sys->stream.i_offset + p_sys->stream.i_read_size )
1246 if( p_sys->stream.i_used < STREAM_READ_ATONCE / 2 )
1247 p_sys->stream.i_used = STREAM_READ_ATONCE / 2;
1249 if( AStreamRefillStream( s ) && i_pos >= tk->i_end )
1250 return VLC_EGENERIC;
1255 static int AStreamReadNoSeekStream( stream_t *s, void *p_read, unsigned int i_read )
1257 stream_sys_t *p_sys = s->p_sys;
1258 stream_track_t *tk = &p_sys->stream.tk[p_sys->stream.i_tk];
1260 uint8_t *p_data = (uint8_t *)p_read;
1261 unsigned int i_data = 0;
1263 if( tk->i_start >= tk->i_end )
1267 msg_Dbg( s, "AStreamReadStream: %d pos=%"PRId64" tk=%d start=%"PRId64
1268 " offset=%d end=%"PRId64,
1269 i_read, p_sys->i_pos, p_sys->stream.i_tk,
1270 tk->i_start, p_sys->stream.i_offset, tk->i_end );
1273 while( i_data < i_read )
1275 unsigned i_off = (tk->i_start + p_sys->stream.i_offset) % STREAM_CACHE_TRACK_SIZE;
1276 unsigned int i_current =
1277 __MIN( tk->i_end - tk->i_start - p_sys->stream.i_offset,
1278 STREAM_CACHE_TRACK_SIZE - i_off );
1279 int i_copy = __MIN( i_current, i_read - i_data );
1281 if( i_copy <= 0 ) break; /* EOF */
1284 /* msg_Dbg( s, "AStreamReadStream: copy %d", i_copy ); */
1287 memcpy( p_data, &tk->p_buffer[i_off], i_copy );
1291 p_sys->stream.i_offset += i_copy;
1293 /* Update pos now */
1294 p_sys->i_pos += i_copy;
1297 p_sys->stream.i_used += i_copy;
1299 if( tk->i_end + i_data <= tk->i_start + p_sys->stream.i_offset + i_read )
1301 const unsigned i_read_requested = VLC_CLIP( i_read - i_data,
1302 STREAM_READ_ATONCE / 2,
1303 STREAM_READ_ATONCE * 10 );
1305 if( p_sys->stream.i_used < i_read_requested )
1306 p_sys->stream.i_used = i_read_requested;
1308 if( AStreamRefillStream( s ) )
1311 if( tk->i_start >= tk->i_end ) break;
1320 static int AStreamRefillStream( stream_t *s )
1322 stream_sys_t *p_sys = s->p_sys;
1323 stream_track_t *tk = &p_sys->stream.tk[p_sys->stream.i_tk];
1325 /* We read but won't increase i_start after initial start + offset */
1327 __MIN( p_sys->stream.i_used, STREAM_CACHE_TRACK_SIZE -
1328 (tk->i_end - tk->i_start - p_sys->stream.i_offset) );
1329 bool b_read = false;
1330 int64_t i_start, i_stop;
1332 if( i_toread <= 0 ) return VLC_EGENERIC; /* EOF */
1335 msg_Dbg( s, "AStreamRefillStream: used=%d toread=%d",
1336 p_sys->stream.i_used, i_toread );
1340 while( i_toread > 0 )
1342 int i_off = tk->i_end % STREAM_CACHE_TRACK_SIZE;
1345 if( !vlc_object_alive(s) )
1346 return VLC_EGENERIC;
1348 i_read = __MIN( i_toread, STREAM_CACHE_TRACK_SIZE - i_off );
1349 i_read = AReadStream( s, &tk->p_buffer[i_off], i_read );
1351 /* msg_Dbg( s, "AStreamRefillStream: read=%d", i_read ); */
1356 else if( i_read == 0 )
1359 return VLC_EGENERIC;
1365 tk->i_end += i_read;
1367 /* Windows of STREAM_CACHE_TRACK_SIZE */
1368 if( tk->i_start + STREAM_CACHE_TRACK_SIZE < tk->i_end )
1370 unsigned i_invalid = tk->i_end - tk->i_start - STREAM_CACHE_TRACK_SIZE;
1372 tk->i_start += i_invalid;
1373 p_sys->stream.i_offset -= i_invalid;
1377 p_sys->stream.i_used -= i_read;
1379 p_sys->stat.i_bytes += i_read;
1380 p_sys->stat.i_read_count++;
1384 p_sys->stat.i_read_time += i_stop - i_start;
1389 static void AStreamPrebufferStream( stream_t *s )
1391 stream_sys_t *p_sys = s->p_sys;
1393 int64_t i_first = 0;
1396 msg_Dbg( s, "starting pre-buffering" );
1400 stream_track_t *tk = &p_sys->stream.tk[p_sys->stream.i_tk];
1402 int64_t i_date = mdate();
1404 int i_buffered = tk->i_end - tk->i_start;
1406 if( !vlc_object_alive(s) || i_buffered >= STREAM_CACHE_PREBUFFER_SIZE )
1411 p_sys->stat.i_bytes = i_buffered;
1412 p_sys->stat.i_read_time = i_date - i_start;
1413 i_byterate = ( INT64_C(1000000) * p_sys->stat.i_bytes ) /
1414 (p_sys->stat.i_read_time+1);
1416 msg_Dbg( s, "pre-buffering done %"PRId64" bytes in %"PRId64"s - "
1418 p_sys->stat.i_bytes,
1419 p_sys->stat.i_read_time / INT64_C(1000000),
1420 i_byterate / 1024 );
1425 i_read = STREAM_CACHE_TRACK_SIZE - i_buffered;
1426 i_read = __MIN( (int)p_sys->stream.i_read_size, i_read );
1427 i_read = AReadStream( s, &tk->p_buffer[i_buffered], i_read );
1430 else if( i_read == 0 )
1436 msg_Dbg( s, "received first data after %d ms",
1437 (int)((i_first-i_start)/1000) );
1440 tk->i_end += i_read;
1442 p_sys->stat.i_read_count++;
1446 /****************************************************************************
1448 ****************************************************************************/
1450 * Read from the stream untill first newline.
1451 * \param s Stream handle to read from
1452 * \return A pointer to the allocated output string. You need to free this when you are done.
1454 #define STREAM_PROBE_LINE 2048
1455 #define STREAM_LINE_MAX (2048*100)
1456 char *stream_ReadLine( stream_t *s )
1458 char *p_line = NULL;
1459 int i_line = 0, i_read = 0;
1461 while( i_read < STREAM_LINE_MAX )
1464 const uint8_t *p_data;
1468 /* Probe new data */
1469 i_data = stream_Peek( s, &p_data, STREAM_PROBE_LINE );
1470 if( i_data <= 0 ) break; /* No more data */
1473 i_pos = stream_Tell( s );
1474 if( i_pos == 0 && i_data >= 2 )
1476 const char *psz_encoding = NULL;
1478 if( !memcmp( p_data, "\xFF\xFE", 2 ) )
1480 psz_encoding = "UTF-16LE";
1481 s->p_text->b_little_endian = true;
1483 else if( !memcmp( p_data, "\xFE\xFF", 2 ) )
1485 psz_encoding = "UTF-16BE";
1488 /* Open the converter if we need it */
1489 if( psz_encoding != NULL )
1491 msg_Dbg( s, "UTF-16 BOM detected" );
1492 s->p_text->i_char_width = 2;
1493 s->p_text->conv = vlc_iconv_open( "UTF-8", psz_encoding );
1494 if( s->p_text->conv == (vlc_iconv_t)-1 )
1495 msg_Err( s, "iconv_open failed" );
1499 if( i_data % s->p_text->i_char_width )
1501 /* keep i_char_width boundary */
1502 i_data = i_data - ( i_data % s->p_text->i_char_width );
1503 msg_Warn( s, "the read is not i_char_width compatible");
1509 /* Check if there is an EOL */
1510 if( s->p_text->i_char_width == 1 )
1512 /* UTF-8: 0A <LF> */
1513 psz_eol = memchr( p_data, '\n', i_data );
1514 if( psz_eol == NULL )
1515 /* UTF-8: 0D <CR> */
1516 psz_eol = memchr( p_data, '\r', i_data );
1520 const uint8_t *p_last = p_data + i_data - s->p_text->i_char_width;
1521 uint16_t eol = s->p_text->b_little_endian ? 0x0A00 : 0x00A0;
1523 assert( s->p_text->i_char_width == 2 );
1525 /* UTF-16: 000A <LF> */
1526 for( const uint8_t *p = p_data; p <= p_last; p += 2 )
1528 if( U16_AT( p ) == eol )
1530 psz_eol = (char *)p + 1;
1535 if( psz_eol == NULL )
1536 { /* UTF-16: 000D <CR> */
1537 eol = s->p_text->b_little_endian ? 0x0D00 : 0x00D0;
1538 for( const uint8_t *p = p_data; p <= p_last; p += 2 )
1540 if( U16_AT( p ) == eol )
1542 psz_eol = (char *)p + 1;
1551 i_data = (psz_eol - (char *)p_data) + 1;
1552 p_line = realloc_or_free( p_line,
1553 i_line + i_data + s->p_text->i_char_width ); /* add \0 */
1556 i_data = stream_Read( s, &p_line[i_line], i_data );
1557 if( i_data <= 0 ) break; /* Hmmm */
1558 i_line += i_data - s->p_text->i_char_width; /* skip \n */;
1561 /* We have our line */
1565 /* Read data (+1 for easy \0 append) */
1566 p_line = realloc_or_free( p_line,
1567 i_line + STREAM_PROBE_LINE + s->p_text->i_char_width );
1570 i_data = stream_Read( s, &p_line[i_line], STREAM_PROBE_LINE );
1571 if( i_data <= 0 ) break; /* Hmmm */
1579 for( j = 0; j < s->p_text->i_char_width; j++ )
1581 p_line[i_line + j] = '\0';
1583 i_line += s->p_text->i_char_width; /* the added \0 */
1584 if( s->p_text->i_char_width > 1 )
1587 size_t i_in = 0, i_out = 0;
1588 const char * p_in = NULL;
1589 char * p_out = NULL;
1590 char * psz_new_line = NULL;
1593 /* UTF-8 needs at most 150% of the buffer as many as UTF-16 */
1594 i_new_line = i_line * 3 / 2;
1595 psz_new_line = malloc( i_new_line );
1596 if( psz_new_line == NULL )
1598 i_in = (size_t)i_line;
1599 i_out = (size_t)i_new_line;
1601 p_out = psz_new_line;
1603 if( vlc_iconv( s->p_text->conv, &p_in, &i_in, &p_out, &i_out ) == (size_t)-1 )
1605 msg_Err( s, "iconv failed" );
1606 msg_Dbg( s, "original: %d, in %d, out %d", i_line, (int)i_in, (int)i_out );
1609 p_line = psz_new_line;
1610 i_line = (size_t)i_new_line - i_out; /* does not include \0 */
1613 /* Remove trailing LF/CR */
1614 while( i_line >= 2 && ( p_line[i_line-2] == '\r' ||
1615 p_line[i_line-2] == '\n') ) i_line--;
1617 /* Make sure the \0 is there */
1618 p_line[i_line-1] = '\0';
1624 /* We failed to read any data, probably EOF */
1628 if( s->p_text->conv != (vlc_iconv_t)(-1) )
1629 vlc_iconv_close( s->p_text->conv );
1630 s->p_text->conv = (vlc_iconv_t)(-1);
1634 /****************************************************************************
1635 * Access reading/seeking wrappers to handle concatenated streams.
1636 ****************************************************************************/
1637 static int AReadStream( stream_t *s, void *p_read, unsigned int i_read )
1639 stream_sys_t *p_sys = s->p_sys;
1640 access_t *p_access = p_sys->p_access;
1641 input_thread_t *p_input = s->p_input;
1642 int i_read_orig = i_read;
1644 if( !p_sys->i_list )
1646 i_read = p_access->pf_read( p_access, p_read, i_read );
1651 vlc_mutex_lock( &p_input->p->counters.counters_lock );
1652 stats_Update( p_input->p->counters.p_read_bytes, i_read, &total );
1653 stats_Update( p_input->p->counters.p_input_bitrate, total, NULL );
1654 stats_Update( p_input->p->counters.p_read_packets, 1, NULL );
1655 vlc_mutex_unlock( &p_input->p->counters.counters_lock );
1660 i_read = p_sys->p_list_access->pf_read( p_sys->p_list_access, p_read,
1663 /* If we reached an EOF then switch to the next stream in the list */
1664 if( i_read == 0 && p_sys->i_list_index + 1 < p_sys->i_list )
1666 char *psz_name = p_sys->list[++p_sys->i_list_index]->psz_path;
1667 access_t *p_list_access;
1669 msg_Dbg( s, "opening input `%s'", psz_name );
1671 p_list_access = access_New( s, s->p_input, p_access->psz_access, "", psz_name );
1673 if( !p_list_access ) return 0;
1675 if( p_sys->p_list_access != p_access )
1676 access_Delete( p_sys->p_list_access );
1678 p_sys->p_list_access = p_list_access;
1680 /* We have to read some data */
1681 return AReadStream( s, p_read, i_read_orig );
1684 /* Update read bytes in input */
1689 vlc_mutex_lock( &p_input->p->counters.counters_lock );
1690 stats_Update( p_input->p->counters.p_read_bytes, i_read, &total );
1691 stats_Update( p_input->p->counters.p_input_bitrate, total, NULL );
1692 stats_Update( p_input->p->counters.p_read_packets, 1, NULL );
1693 vlc_mutex_unlock( &p_input->p->counters.counters_lock );
1698 static block_t *AReadBlock( stream_t *s, bool *pb_eof )
1700 stream_sys_t *p_sys = s->p_sys;
1701 access_t *p_access = p_sys->p_access;
1702 input_thread_t *p_input = s->p_input;
1706 if( !p_sys->i_list )
1708 p_block = p_access->pf_block( p_access );
1709 if( pb_eof ) *pb_eof = p_access->info.b_eof;
1710 if( p_input && p_block && libvlc_stats (p_access) )
1714 vlc_mutex_lock( &p_input->p->counters.counters_lock );
1715 stats_Update( p_input->p->counters.p_read_bytes,
1716 p_block->i_buffer, &total );
1717 stats_Update( p_input->p->counters.p_input_bitrate,
1719 stats_Update( p_input->p->counters.p_read_packets, 1, NULL );
1720 vlc_mutex_unlock( &p_input->p->counters.counters_lock );
1725 p_block = p_sys->p_list_access->pf_block( p_sys->p_list_access );
1726 b_eof = p_sys->p_list_access->info.b_eof;
1727 if( pb_eof ) *pb_eof = b_eof;
1729 /* If we reached an EOF then switch to the next stream in the list */
1730 if( !p_block && b_eof && p_sys->i_list_index + 1 < p_sys->i_list )
1732 char *psz_name = p_sys->list[++p_sys->i_list_index]->psz_path;
1733 access_t *p_list_access;
1735 msg_Dbg( s, "opening input `%s'", psz_name );
1737 p_list_access = access_New( s, s->p_input, p_access->psz_access, "", psz_name );
1739 if( !p_list_access ) return 0;
1741 if( p_sys->p_list_access != p_access )
1742 access_Delete( p_sys->p_list_access );
1744 p_sys->p_list_access = p_list_access;
1746 /* We have to read some data */
1747 return AReadBlock( s, pb_eof );
1755 vlc_mutex_lock( &p_input->p->counters.counters_lock );
1756 stats_Update( p_input->p->counters.p_read_bytes,
1757 p_block->i_buffer, &total );
1758 stats_Update( p_input->p->counters.p_input_bitrate, total, NULL );
1759 stats_Update( p_input->p->counters.p_read_packets, 1 , NULL);
1760 vlc_mutex_unlock( &p_input->p->counters.counters_lock );
1766 static int ASeek( stream_t *s, uint64_t i_pos )
1768 stream_sys_t *p_sys = s->p_sys;
1769 access_t *p_access = p_sys->p_access;
1771 /* Check which stream we need to access */
1777 access_t *p_list_access = 0;
1779 for( i = 0; i < p_sys->i_list - 1; i++ )
1781 if( i_pos < p_sys->list[i]->i_size + i_size ) break;
1782 i_size += p_sys->list[i]->i_size;
1784 psz_name = p_sys->list[i]->psz_path;
1786 if( i != p_sys->i_list_index )
1787 msg_Dbg( s, "opening input `%s'", psz_name );
1789 if( i != p_sys->i_list_index && i != 0 )
1792 access_New( s, s->p_input, p_access->psz_access, "", psz_name );
1794 else if( i != p_sys->i_list_index )
1796 p_list_access = p_access;
1801 if( p_sys->p_list_access != p_access )
1802 access_Delete( p_sys->p_list_access );
1804 p_sys->p_list_access = p_list_access;
1807 p_sys->i_list_index = i;
1808 return p_sys->p_list_access->pf_seek( p_sys->p_list_access,
1812 return p_access->pf_seek( p_access, i_pos );
1817 * Try to read "i_read" bytes into a buffer pointed by "p_read". If
1818 * "p_read" is NULL then data are skipped instead of read.
1819 * \return The real number of bytes read/skip. If this value is less
1820 * than i_read that means that it's the end of the stream.
1821 * \note stream_Read increments the stream position, and when p_read is NULL,
1822 * this is its only task.
1824 int stream_Read( stream_t *s, void *p_read, int i_read )
1826 return s->pf_read( s, p_read, i_read );
1830 * Store in pp_peek a pointer to the next "i_peek" bytes in the stream
1831 * \return The real number of valid bytes. If it's less
1832 * or equal to 0, *pp_peek is invalid.
1833 * \note pp_peek is a pointer to internal buffer and it will be invalid as
1834 * soons as other stream_* functions are called.
1835 * \note Contrary to stream_Read, stream_Peek doesn't modify the stream
1836 * position, and doesn't necessarily involve copying of data. It's mainly
1837 * used by the modules to quickly probe the (head of the) stream.
1838 * \note Due to input limitation, the return value could be less than i_peek
1839 * without meaning the end of the stream (but only when you have i_peek >=
1840 * p_input->i_bufsize)
1842 int stream_Peek( stream_t *s, const uint8_t **pp_peek, int i_peek )
1844 return s->pf_peek( s, pp_peek, i_peek );
1848 * Use to control the "stream_t *". Look at #stream_query_e for
1849 * possible "i_query" value and format arguments. Return VLC_SUCCESS
1850 * if ... succeed ;) and VLC_EGENERIC if failed or unimplemented
1852 int stream_vaControl( stream_t *s, int i_query, va_list args )
1854 return s->pf_control( s, i_query, args );
1860 void stream_Delete( stream_t *s )
1865 int stream_Control( stream_t *s, int i_query, ... )
1871 return VLC_EGENERIC;
1873 va_start( args, i_query );
1874 i_result = s->pf_control( s, i_query, args );
1880 * Read "i_size" bytes and store them in a block_t.
1881 * It always read i_size bytes unless you are at the end of the stream
1882 * where it return what is available.
1884 block_t *stream_Block( stream_t *s, int i_size )
1886 if( i_size <= 0 ) return NULL;
1888 /* emulate block read */
1889 block_t *p_bk = block_Alloc( i_size );
1892 int i_read = stream_Read( s, p_bk->p_buffer, i_size );
1895 p_bk->i_buffer = i_read;
1898 block_Release( p_bk );
1904 * Read the remaining of the data if there is less than i_max_size bytes, otherwise
1907 * The stream position is unknown after the call.
1909 block_t *stream_BlockRemaining( stream_t *s, int i_max_size )
1911 int i_allocate = __MIN(1000000, i_max_size);
1912 int64_t i_size = stream_Size( s );
1915 int64_t i_position = stream_Tell( s );
1916 if( i_position + i_max_size < i_size )
1918 msg_Err( s, "Remaining stream size is greater than %d bytes",
1922 i_allocate = i_size - i_position;
1924 if( i_allocate <= 0 )
1927 block_t *p_block = block_Alloc( i_allocate );
1931 int i_read = stream_Read( s, &p_block->p_buffer[i_index],
1932 p_block->i_buffer - i_index);
1936 i_max_size -= i_read;
1937 if( i_max_size <= 0 )
1939 p_block = block_Realloc( p_block, 0, p_block->i_buffer +
1940 __MIN(1000000, i_max_size) );
1943 p_block->i_buffer = i_index;