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 = access_GetSize( p_access );
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_entry->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 p_entry = malloc( sizeof(*p_entry) );
348 p_entry->i_size = access_GetSize( p_tmp );
349 p_entry->psz_path = psz_name;
350 TAB_APPEND( p_sys->i_list, p_sys->list, p_entry );
351 msg_Dbg( p_access, "adding file `%s', (%"PRId64" bytes)",
352 p_entry->psz_path, p_entry->i_size );
354 access_Delete( p_tmp );
360 p_sys->p_peek = NULL;
362 if( p_sys->method == STREAM_METHOD_BLOCK )
364 msg_Dbg( s, "Using block method for AStream*" );
365 s->pf_read = AStreamReadBlock;
366 s->pf_peek = AStreamPeekBlock;
368 /* Init all fields of p_sys->block */
369 p_sys->block.i_start = p_sys->i_pos;
370 p_sys->block.i_offset = 0;
371 p_sys->block.p_current = NULL;
372 p_sys->block.i_size = 0;
373 p_sys->block.p_first = NULL;
374 p_sys->block.pp_last = &p_sys->block.p_first;
376 /* Do the prebuffering */
377 AStreamPrebufferBlock( s );
379 if( p_sys->block.i_size <= 0 )
381 msg_Err( s, "cannot pre fill buffer" );
389 assert( p_sys->method == STREAM_METHOD_STREAM );
391 msg_Dbg( s, "Using stream method for AStream*" );
393 s->pf_read = AStreamReadStream;
394 s->pf_peek = AStreamPeekStream;
396 /* Allocate/Setup our tracks */
397 p_sys->stream.i_offset = 0;
398 p_sys->stream.i_tk = 0;
399 p_sys->stream.p_buffer = malloc( STREAM_CACHE_SIZE );
400 if( p_sys->stream.p_buffer == NULL )
402 p_sys->stream.i_used = 0;
403 p_sys->stream.i_read_size = STREAM_READ_ATONCE;
404 #if STREAM_READ_ATONCE < 256
405 # error "Invalid STREAM_READ_ATONCE value"
408 for( i = 0; i < STREAM_CACHE_TRACK; i++ )
410 p_sys->stream.tk[i].i_date = 0;
411 p_sys->stream.tk[i].i_start = p_sys->i_pos;
412 p_sys->stream.tk[i].i_end = p_sys->i_pos;
413 p_sys->stream.tk[i].p_buffer=
414 &p_sys->stream.p_buffer[i * STREAM_CACHE_TRACK_SIZE];
417 /* Do the prebuffering */
418 AStreamPrebufferStream( s );
420 if( p_sys->stream.tk[p_sys->stream.i_tk].i_end <= 0 )
422 msg_Err( s, "cannot pre fill buffer" );
430 if( p_sys->method == STREAM_METHOD_BLOCK )
436 free( p_sys->stream.p_buffer );
438 while( p_sys->i_list > 0 )
439 free( p_sys->list[--(p_sys->i_list)] );
442 stream_CommonDelete( s );
443 access_Delete( p_access );
447 /****************************************************************************
449 ****************************************************************************/
450 static void AStreamDestroy( stream_t *s )
452 stream_sys_t *p_sys = s->p_sys;
454 if( p_sys->method == STREAM_METHOD_BLOCK )
455 block_ChainRelease( p_sys->block.p_first );
457 free( p_sys->stream.p_buffer );
459 free( p_sys->p_peek );
461 if( p_sys->p_list_access && p_sys->p_list_access != p_sys->p_access )
462 access_Delete( p_sys->p_list_access );
464 while( p_sys->i_list-- )
466 free( p_sys->list[p_sys->i_list]->psz_path );
467 free( p_sys->list[p_sys->i_list] );
471 stream_CommonDelete( s );
472 access_Delete( p_sys->p_access );
476 /****************************************************************************
477 * AStreamControlReset:
478 ****************************************************************************/
479 static void AStreamControlReset( stream_t *s )
481 stream_sys_t *p_sys = s->p_sys;
483 p_sys->i_pos = p_sys->p_access->info.i_pos;
485 if( p_sys->method == STREAM_METHOD_BLOCK )
487 block_ChainRelease( p_sys->block.p_first );
489 /* Init all fields of p_sys->block */
490 p_sys->block.i_start = p_sys->i_pos;
491 p_sys->block.i_offset = 0;
492 p_sys->block.p_current = NULL;
493 p_sys->block.i_size = 0;
494 p_sys->block.p_first = NULL;
495 p_sys->block.pp_last = &p_sys->block.p_first;
497 /* Do the prebuffering */
498 AStreamPrebufferBlock( s );
504 assert( p_sys->method == STREAM_METHOD_STREAM );
506 /* Setup our tracks */
507 p_sys->stream.i_offset = 0;
508 p_sys->stream.i_tk = 0;
509 p_sys->stream.i_used = 0;
511 for( i = 0; i < STREAM_CACHE_TRACK; i++ )
513 p_sys->stream.tk[i].i_date = 0;
514 p_sys->stream.tk[i].i_start = p_sys->i_pos;
515 p_sys->stream.tk[i].i_end = p_sys->i_pos;
518 /* Do the prebuffering */
519 AStreamPrebufferStream( s );
523 /****************************************************************************
524 * AStreamControlUpdate:
525 ****************************************************************************/
526 static void AStreamControlUpdate( stream_t *s )
528 stream_sys_t *p_sys = s->p_sys;
530 p_sys->i_pos = p_sys->p_access->info.i_pos;
535 for( i = 0; i < p_sys->i_list_index; i++ )
537 p_sys->i_pos += p_sys->list[i]->i_size;
542 /****************************************************************************
544 ****************************************************************************/
545 static int AStreamControl( stream_t *s, int i_query, va_list args )
547 stream_sys_t *p_sys = s->p_sys;
548 access_t *p_access = p_sys->p_access;
550 uint64_t *pi_64, i_64;
554 case STREAM_GET_SIZE:
555 pi_64 = va_arg( args, uint64_t * );
556 if( s->p_sys->i_list )
560 for( i = 0; i < s->p_sys->i_list; i++ )
561 *pi_64 += s->p_sys->list[i]->i_size;
564 *pi_64 = access_GetSize( p_access );
567 case STREAM_CAN_SEEK:
568 return access_vaControl( p_access, ACCESS_CAN_SEEK, args );
569 case STREAM_CAN_FASTSEEK:
570 return access_vaControl( p_access, ACCESS_CAN_FASTSEEK, args );
571 case STREAM_CAN_PAUSE:
572 return access_vaControl( p_access, ACCESS_CAN_PAUSE, args );
573 case STREAM_CAN_CONTROL_PACE:
574 return access_vaControl( p_access, ACCESS_CAN_CONTROL_PACE, args );
576 case STREAM_GET_POSITION:
577 pi_64 = va_arg( args, uint64_t * );
578 *pi_64 = p_sys->i_pos;
581 case STREAM_SET_POSITION:
582 i_64 = va_arg( args, uint64_t );
583 switch( p_sys->method )
585 case STREAM_METHOD_BLOCK:
586 return AStreamSeekBlock( s, i_64 );
587 case STREAM_METHOD_STREAM:
588 return AStreamSeekStream( s, i_64 );
594 case STREAM_CONTROL_ACCESS:
596 int i_int = (int) va_arg( args, int );
597 if( i_int != ACCESS_SET_PRIVATE_ID_STATE &&
598 i_int != ACCESS_SET_PRIVATE_ID_CA &&
599 i_int != ACCESS_GET_PRIVATE_ID_STATE )
601 msg_Err( s, "Hey, what are you thinking ?"
602 "DON'T USE STREAM_CONTROL_ACCESS !!!" );
605 return access_vaControl( p_access, i_int, args );
608 case STREAM_UPDATE_SIZE:
609 AStreamControlUpdate( s );
612 case STREAM_GET_TITLE_INFO:
613 return access_vaControl( p_access, ACCESS_GET_TITLE_INFO, args );
614 case STREAM_GET_META:
615 return access_vaControl( p_access, ACCESS_GET_META, args );
616 case STREAM_GET_CONTENT_TYPE:
617 return access_vaControl( p_access, ACCESS_GET_CONTENT_TYPE, args );
618 case STREAM_GET_SIGNAL:
619 return access_vaControl( p_access, ACCESS_GET_SIGNAL, args );
621 case STREAM_SET_PAUSE_STATE:
622 return access_vaControl( p_access, ACCESS_SET_PAUSE_STATE, args );
623 case STREAM_SET_TITLE:
625 int ret = access_vaControl( p_access, ACCESS_SET_TITLE, args );
626 if( ret == VLC_SUCCESS )
627 AStreamControlReset( s );
630 case STREAM_SET_SEEKPOINT:
632 int ret = access_vaControl( p_access, ACCESS_SET_SEEKPOINT, args );
633 if( ret == VLC_SUCCESS )
634 AStreamControlReset( s );
638 case STREAM_SET_RECORD_STATE:
640 msg_Err( s, "invalid stream_vaControl query=0x%x", i_query );
646 /****************************************************************************
648 ****************************************************************************/
649 static void AStreamPrebufferBlock( stream_t *s )
651 stream_sys_t *p_sys = s->p_sys;
656 msg_Dbg( s, "starting pre-buffering" );
660 const int64_t i_date = mdate();
664 if( !vlc_object_alive(s) || p_sys->block.i_size > STREAM_CACHE_PREBUFFER_SIZE )
669 p_sys->stat.i_bytes = p_sys->block.i_size;
670 p_sys->stat.i_read_time = i_date - i_start;
671 i_byterate = ( INT64_C(1000000) * p_sys->stat.i_bytes ) /
672 (p_sys->stat.i_read_time + 1);
674 msg_Dbg( s, "prebuffering done %"PRId64" bytes in %"PRId64"s - "
677 p_sys->stat.i_read_time / INT64_C(1000000),
683 if( ( b = AReadBlock( s, &b_eof ) ) == NULL )
692 /* Append the block */
693 p_sys->block.i_size += b->i_buffer;
694 *p_sys->block.pp_last = b;
695 p_sys->block.pp_last = &b->p_next;
697 p_sys->stat.i_read_count++;
704 msg_Dbg( s, "received first data after %d ms",
705 (int)((i_first-i_start)/1000) );
709 p_sys->block.p_current = p_sys->block.p_first;
712 static int AStreamRefillBlock( stream_t *s );
714 static int AStreamReadBlock( stream_t *s, void *p_read, unsigned int i_read )
716 stream_sys_t *p_sys = s->p_sys;
718 uint8_t *p_data = p_read;
719 unsigned int i_data = 0;
722 if( p_sys->block.p_current == NULL )
727 /* seek within this stream if possible, else use plain old read and discard */
728 stream_sys_t *p_sys = s->p_sys;
729 access_t *p_access = p_sys->p_access;
731 access_Control( p_access, ACCESS_CAN_SEEK, &b_aseek );
733 return AStreamSeekBlock( s, p_sys->i_pos + i_read ) ? 0 : i_read;
736 while( i_data < i_read )
739 p_sys->block.p_current->i_buffer - p_sys->block.i_offset;
740 unsigned int i_copy = VLC_CLIP( (unsigned int)i_current, 0, i_read - i_data);
746 &p_sys->block.p_current->p_buffer[p_sys->block.i_offset],
752 p_sys->block.i_offset += i_copy;
753 if( p_sys->block.i_offset >= p_sys->block.p_current->i_buffer )
755 /* Current block is now empty, switch to next */
756 if( p_sys->block.p_current )
758 p_sys->block.i_offset = 0;
759 p_sys->block.p_current = p_sys->block.p_current->p_next;
761 /*Get a new block if needed */
762 if( !p_sys->block.p_current && AStreamRefillBlock( s ) )
769 p_sys->i_pos += i_data;
773 static int AStreamPeekBlock( stream_t *s, const uint8_t **pp_peek, unsigned int i_read )
775 stream_sys_t *p_sys = s->p_sys;
777 unsigned int i_data = 0;
779 unsigned int i_offset;
781 if( p_sys->block.p_current == NULL ) return 0; /* EOF */
783 /* We can directly give a pointer over our buffer */
784 if( i_read <= p_sys->block.p_current->i_buffer - p_sys->block.i_offset )
786 *pp_peek = &p_sys->block.p_current->p_buffer[p_sys->block.i_offset];
790 /* We need to create a local copy */
791 if( p_sys->i_peek < i_read )
793 p_sys->p_peek = realloc_or_free( p_sys->p_peek, i_read );
799 p_sys->i_peek = i_read;
802 /* Fill enough data */
803 while( p_sys->block.i_size - (p_sys->i_pos - p_sys->block.i_start)
806 block_t **pp_last = p_sys->block.pp_last;
808 if( AStreamRefillBlock( s ) ) break;
810 /* Our buffer are probably filled enough, don't try anymore */
811 if( pp_last == p_sys->block.pp_last ) break;
814 /* Copy what we have */
815 b = p_sys->block.p_current;
816 i_offset = p_sys->block.i_offset;
817 p_data = p_sys->p_peek;
819 while( b && i_data < i_read )
821 unsigned int i_current = __MAX(b->i_buffer - i_offset,0);
822 int i_copy = __MIN( i_current, i_read - i_data );
824 memcpy( p_data, &b->p_buffer[i_offset], i_copy );
829 if( i_offset >= b->i_buffer )
836 *pp_peek = p_sys->p_peek;
840 static int AStreamSeekBlock( stream_t *s, uint64_t i_pos )
842 stream_sys_t *p_sys = s->p_sys;
843 access_t *p_access = p_sys->p_access;
844 int64_t i_offset = i_pos - p_sys->block.i_start;
847 /* We already have thoses data, just update p_current/i_offset */
848 if( i_offset >= 0 && (uint64_t)i_offset < p_sys->block.i_size )
850 block_t *b = p_sys->block.p_first;
853 while( i_current + b->i_buffer < (uint64_t)i_offset )
855 i_current += b->i_buffer;
859 p_sys->block.p_current = b;
860 p_sys->block.i_offset = i_offset - i_current;
862 p_sys->i_pos = i_pos;
867 /* We may need to seek or to read data */
871 access_Control( p_access, ACCESS_CAN_SEEK, &b_aseek );
875 msg_Err( s, "backward seeking impossible (access not seekable)" );
883 bool b_aseek, b_aseekfast;
885 access_Control( p_access, ACCESS_CAN_SEEK, &b_aseek );
886 access_Control( p_access, ACCESS_CAN_FASTSEEK, &b_aseekfast );
891 msg_Warn( s, "%"PRId64" bytes need to be skipped "
892 "(access non seekable)",
893 i_offset - p_sys->block.i_size );
897 int64_t i_skip = i_offset - p_sys->block.i_size;
899 /* Avg bytes per packets */
900 int i_avg = p_sys->stat.i_bytes / p_sys->stat.i_read_count;
901 /* TODO compute a seek cost instead of fixed threshold */
902 int i_th = b_aseekfast ? 1 : 5;
904 if( i_skip <= i_th * i_avg &&
905 i_skip < STREAM_CACHE_SIZE )
910 msg_Dbg( s, "b_seek=%d th*avg=%d skip=%"PRId64,
911 b_seek, i_th*i_avg, i_skip );
917 int64_t i_start, i_end;
918 /* Do the access seek */
920 if( ASeek( s, i_pos ) ) return VLC_EGENERIC;
924 block_ChainRelease( p_sys->block.p_first );
927 p_sys->block.i_start = p_sys->i_pos = i_pos;
928 p_sys->block.i_offset = 0;
929 p_sys->block.p_current = NULL;
930 p_sys->block.i_size = 0;
931 p_sys->block.p_first = NULL;
932 p_sys->block.pp_last = &p_sys->block.p_first;
935 if( AStreamRefillBlock( s ) )
939 p_sys->stat.i_seek_time += i_end - i_start;
940 p_sys->stat.i_seek_count++;
947 while( p_sys->block.p_current &&
948 p_sys->i_pos + p_sys->block.p_current->i_buffer - p_sys->block.i_offset <= i_pos )
950 p_sys->i_pos += p_sys->block.p_current->i_buffer - p_sys->block.i_offset;
951 p_sys->block.p_current = p_sys->block.p_current->p_next;
952 p_sys->block.i_offset = 0;
954 if( !p_sys->block.p_current && AStreamRefillBlock( s ) )
956 if( p_sys->i_pos != i_pos )
960 while( p_sys->block.i_start + p_sys->block.i_size < i_pos );
962 p_sys->block.i_offset += i_pos - p_sys->i_pos;
963 p_sys->i_pos = i_pos;
971 static int AStreamRefillBlock( stream_t *s )
973 stream_sys_t *p_sys = s->p_sys;
977 while( p_sys->block.i_size >= STREAM_CACHE_SIZE &&
978 p_sys->block.p_first != p_sys->block.p_current )
980 block_t *b = p_sys->block.p_first;
982 p_sys->block.i_start += b->i_buffer;
983 p_sys->block.i_size -= b->i_buffer;
984 p_sys->block.p_first = b->p_next;
988 if( p_sys->block.i_size >= STREAM_CACHE_SIZE &&
989 p_sys->block.p_current == p_sys->block.p_first &&
990 p_sys->block.p_current->p_next ) /* At least 2 packets */
992 /* Enough data, don't read more */
996 /* Now read a new block */
997 const int64_t i_start = mdate();
1002 if( !vlc_object_alive(s) )
1003 return VLC_EGENERIC;
1006 if( ( b = AReadBlock( s, &b_eof ) ) )
1009 return VLC_EGENERIC;
1012 p_sys->stat.i_read_time += mdate() - i_start;
1015 /* Append the block */
1016 p_sys->block.i_size += b->i_buffer;
1017 *p_sys->block.pp_last = b;
1018 p_sys->block.pp_last = &b->p_next;
1021 if( p_sys->block.p_current == NULL )
1022 p_sys->block.p_current = b;
1025 p_sys->stat.i_bytes += b->i_buffer;
1026 p_sys->stat.i_read_count++;
1034 /****************************************************************************
1036 ****************************************************************************/
1037 static int AStreamRefillStream( stream_t *s );
1038 static int AStreamReadNoSeekStream( stream_t *s, void *p_read, unsigned int i_read );
1040 static int AStreamReadStream( stream_t *s, void *p_read, unsigned int i_read )
1042 stream_sys_t *p_sys = s->p_sys;
1046 const uint64_t i_pos_wanted = p_sys->i_pos + i_read;
1048 if( AStreamSeekStream( s, i_pos_wanted ) )
1050 if( p_sys->i_pos != i_pos_wanted )
1055 return AStreamReadNoSeekStream( s, p_read, i_read );
1058 static int AStreamPeekStream( stream_t *s, const uint8_t **pp_peek, unsigned int i_read )
1060 stream_sys_t *p_sys = s->p_sys;
1061 stream_track_t *tk = &p_sys->stream.tk[p_sys->stream.i_tk];
1064 if( tk->i_start >= tk->i_end ) return 0; /* EOF */
1067 msg_Dbg( s, "AStreamPeekStream: %d pos=%"PRId64" tk=%d "
1068 "start=%"PRId64" offset=%d end=%"PRId64,
1069 i_read, p_sys->i_pos, p_sys->stream.i_tk,
1070 tk->i_start, p_sys->stream.i_offset, tk->i_end );
1073 /* Avoid problem, but that should *never* happen */
1074 if( i_read > STREAM_CACHE_TRACK_SIZE / 2 )
1075 i_read = STREAM_CACHE_TRACK_SIZE / 2;
1077 while( tk->i_end < tk->i_start + p_sys->stream.i_offset + i_read )
1079 if( p_sys->stream.i_used <= 1 )
1081 /* Be sure we will read something */
1082 p_sys->stream.i_used += tk->i_start + p_sys->stream.i_offset + i_read - tk->i_end;
1084 if( AStreamRefillStream( s ) ) break;
1087 if( tk->i_end < tk->i_start + p_sys->stream.i_offset + i_read )
1089 i_read = tk->i_end - tk->i_start - p_sys->stream.i_offset;
1093 /* Now, direct pointer or a copy ? */
1094 i_off = (tk->i_start + p_sys->stream.i_offset) % STREAM_CACHE_TRACK_SIZE;
1095 if( i_off + i_read <= STREAM_CACHE_TRACK_SIZE )
1097 *pp_peek = &tk->p_buffer[i_off];
1101 if( p_sys->i_peek < i_read )
1103 p_sys->p_peek = realloc_or_free( p_sys->p_peek, i_read );
1104 if( !p_sys->p_peek )
1109 p_sys->i_peek = i_read;
1112 memcpy( p_sys->p_peek, &tk->p_buffer[i_off],
1113 STREAM_CACHE_TRACK_SIZE - i_off );
1114 memcpy( &p_sys->p_peek[STREAM_CACHE_TRACK_SIZE - i_off],
1115 &tk->p_buffer[0], i_read - (STREAM_CACHE_TRACK_SIZE - i_off) );
1117 *pp_peek = p_sys->p_peek;
1121 static int AStreamSeekStream( stream_t *s, uint64_t i_pos )
1123 stream_sys_t *p_sys = s->p_sys;
1125 stream_track_t *p_current = &p_sys->stream.tk[p_sys->stream.i_tk];
1126 access_t *p_access = p_sys->p_access;
1128 if( p_current->i_start >= p_current->i_end && i_pos >= p_current->i_end )
1132 msg_Dbg( s, "AStreamSeekStream: to %"PRId64" pos=%"PRId64
1133 " tk=%d start=%"PRId64" offset=%d end=%"PRId64,
1134 i_pos, p_sys->i_pos, p_sys->stream.i_tk,
1136 p_sys->stream.i_offset,
1141 access_Control( p_access, ACCESS_CAN_SEEK, &b_aseek );
1142 if( !b_aseek && i_pos < p_current->i_start )
1144 msg_Warn( s, "AStreamSeekStream: can't seek" );
1145 return VLC_EGENERIC;
1149 access_Control( p_access, ACCESS_CAN_FASTSEEK, &b_afastseek );
1151 /* FIXME compute seek cost (instead of static 'stupid' value) */
1152 uint64_t i_skip_threshold;
1154 i_skip_threshold = b_afastseek ? 128 : 3*p_sys->stream.i_read_size;
1156 i_skip_threshold = INT64_MAX;
1158 /* Date the current track */
1159 p_current->i_date = mdate();
1161 /* Search a new track slot */
1162 stream_track_t *tk = NULL;
1165 /* Prefer the current track */
1166 if( p_current->i_start <= i_pos && i_pos <= p_current->i_end + i_skip_threshold )
1169 i_tk_idx = p_sys->stream.i_tk;
1173 /* Try to maximize already read data */
1174 for( int i = 0; i < STREAM_CACHE_TRACK; i++ )
1176 stream_track_t *t = &p_sys->stream.tk[i];
1178 if( t->i_start > i_pos || i_pos > t->i_end )
1181 if( !tk || tk->i_end < t->i_end )
1190 /* Use the oldest unused */
1191 for( int i = 0; i < STREAM_CACHE_TRACK; i++ )
1193 stream_track_t *t = &p_sys->stream.tk[i];
1195 if( !tk || tk->i_date > t->i_date )
1202 assert( i_tk_idx >= 0 && i_tk_idx < STREAM_CACHE_TRACK );
1204 if( tk != p_current )
1205 i_skip_threshold = 0;
1206 if( tk->i_start <= i_pos && i_pos <= tk->i_end + i_skip_threshold )
1209 msg_Err( s, "AStreamSeekStream: reusing %d start=%"PRId64
1210 " end=%"PRId64"(%s)",
1211 i_tk_idx, tk->i_start, tk->i_end,
1212 tk != p_current ? "seek" : i_pos > tk->i_end ? "skip" : "noseek" );
1214 if( tk != p_current )
1218 /* Seek at the end of the buffer
1219 * TODO it is stupid to seek now, it would be better to delay it
1221 if( ASeek( s, tk->i_end ) )
1222 return VLC_EGENERIC;
1224 else if( i_pos > tk->i_end )
1226 uint64_t i_skip = i_pos - tk->i_end;
1229 const int i_read_max = __MIN( 10 * STREAM_READ_ATONCE, i_skip );
1230 if( AStreamReadNoSeekStream( s, NULL, i_read_max ) != i_read_max )
1231 return VLC_EGENERIC;
1232 i_skip -= i_read_max;
1239 msg_Err( s, "AStreamSeekStream: hard seek" );
1241 /* Nothing good, seek and choose oldest segment */
1242 if( ASeek( s, i_pos ) )
1243 return VLC_EGENERIC;
1245 tk->i_start = i_pos;
1248 p_sys->stream.i_offset = i_pos - tk->i_start;
1249 p_sys->stream.i_tk = i_tk_idx;
1250 p_sys->i_pos = i_pos;
1252 /* If there is not enough data left in the track, refill */
1253 /* TODO How to get a correct value for
1254 * - refilling threshold
1255 * - how much to refill
1257 if( tk->i_end < tk->i_start + p_sys->stream.i_offset + p_sys->stream.i_read_size )
1259 if( p_sys->stream.i_used < STREAM_READ_ATONCE / 2 )
1260 p_sys->stream.i_used = STREAM_READ_ATONCE / 2;
1262 if( AStreamRefillStream( s ) && i_pos >= tk->i_end )
1263 return VLC_EGENERIC;
1268 static int AStreamReadNoSeekStream( stream_t *s, void *p_read, unsigned int i_read )
1270 stream_sys_t *p_sys = s->p_sys;
1271 stream_track_t *tk = &p_sys->stream.tk[p_sys->stream.i_tk];
1273 uint8_t *p_data = (uint8_t *)p_read;
1274 unsigned int i_data = 0;
1276 if( tk->i_start >= tk->i_end )
1280 msg_Dbg( s, "AStreamReadStream: %d pos=%"PRId64" tk=%d start=%"PRId64
1281 " offset=%d end=%"PRId64,
1282 i_read, p_sys->i_pos, p_sys->stream.i_tk,
1283 tk->i_start, p_sys->stream.i_offset, tk->i_end );
1286 while( i_data < i_read )
1288 unsigned i_off = (tk->i_start + p_sys->stream.i_offset) % STREAM_CACHE_TRACK_SIZE;
1289 unsigned int i_current =
1290 __MIN( tk->i_end - tk->i_start - p_sys->stream.i_offset,
1291 STREAM_CACHE_TRACK_SIZE - i_off );
1292 int i_copy = __MIN( i_current, i_read - i_data );
1294 if( i_copy <= 0 ) break; /* EOF */
1297 /* msg_Dbg( s, "AStreamReadStream: copy %d", i_copy ); */
1300 memcpy( p_data, &tk->p_buffer[i_off], i_copy );
1304 p_sys->stream.i_offset += i_copy;
1306 /* Update pos now */
1307 p_sys->i_pos += i_copy;
1310 p_sys->stream.i_used += i_copy;
1312 if( tk->i_end + i_data <= tk->i_start + p_sys->stream.i_offset + i_read )
1314 const unsigned i_read_requested = VLC_CLIP( i_read - i_data,
1315 STREAM_READ_ATONCE / 2,
1316 STREAM_READ_ATONCE * 10 );
1318 if( p_sys->stream.i_used < i_read_requested )
1319 p_sys->stream.i_used = i_read_requested;
1321 if( AStreamRefillStream( s ) )
1324 if( tk->i_start >= tk->i_end ) break;
1333 static int AStreamRefillStream( stream_t *s )
1335 stream_sys_t *p_sys = s->p_sys;
1336 stream_track_t *tk = &p_sys->stream.tk[p_sys->stream.i_tk];
1338 /* We read but won't increase i_start after initial start + offset */
1340 __MIN( p_sys->stream.i_used, STREAM_CACHE_TRACK_SIZE -
1341 (tk->i_end - tk->i_start - p_sys->stream.i_offset) );
1342 bool b_read = false;
1343 int64_t i_start, i_stop;
1345 if( i_toread <= 0 ) return VLC_EGENERIC; /* EOF */
1348 msg_Dbg( s, "AStreamRefillStream: used=%d toread=%d",
1349 p_sys->stream.i_used, i_toread );
1353 while( i_toread > 0 )
1355 int i_off = tk->i_end % STREAM_CACHE_TRACK_SIZE;
1358 if( !vlc_object_alive(s) )
1359 return VLC_EGENERIC;
1361 i_read = __MIN( i_toread, STREAM_CACHE_TRACK_SIZE - i_off );
1362 i_read = AReadStream( s, &tk->p_buffer[i_off], i_read );
1364 /* msg_Dbg( s, "AStreamRefillStream: read=%d", i_read ); */
1369 else if( i_read == 0 )
1372 return VLC_EGENERIC;
1378 tk->i_end += i_read;
1380 /* Windows of STREAM_CACHE_TRACK_SIZE */
1381 if( tk->i_start + STREAM_CACHE_TRACK_SIZE < tk->i_end )
1383 unsigned i_invalid = tk->i_end - tk->i_start - STREAM_CACHE_TRACK_SIZE;
1385 tk->i_start += i_invalid;
1386 p_sys->stream.i_offset -= i_invalid;
1390 p_sys->stream.i_used -= i_read;
1392 p_sys->stat.i_bytes += i_read;
1393 p_sys->stat.i_read_count++;
1397 p_sys->stat.i_read_time += i_stop - i_start;
1402 static void AStreamPrebufferStream( stream_t *s )
1404 stream_sys_t *p_sys = s->p_sys;
1406 int64_t i_first = 0;
1409 msg_Dbg( s, "starting pre-buffering" );
1413 stream_track_t *tk = &p_sys->stream.tk[p_sys->stream.i_tk];
1415 int64_t i_date = mdate();
1417 int i_buffered = tk->i_end - tk->i_start;
1419 if( !vlc_object_alive(s) || i_buffered >= STREAM_CACHE_PREBUFFER_SIZE )
1424 p_sys->stat.i_bytes = i_buffered;
1425 p_sys->stat.i_read_time = i_date - i_start;
1426 i_byterate = ( INT64_C(1000000) * p_sys->stat.i_bytes ) /
1427 (p_sys->stat.i_read_time+1);
1429 msg_Dbg( s, "pre-buffering done %"PRId64" bytes in %"PRId64"s - "
1431 p_sys->stat.i_bytes,
1432 p_sys->stat.i_read_time / INT64_C(1000000),
1433 i_byterate / 1024 );
1438 i_read = STREAM_CACHE_TRACK_SIZE - i_buffered;
1439 i_read = __MIN( (int)p_sys->stream.i_read_size, i_read );
1440 i_read = AReadStream( s, &tk->p_buffer[i_buffered], i_read );
1443 else if( i_read == 0 )
1449 msg_Dbg( s, "received first data after %d ms",
1450 (int)((i_first-i_start)/1000) );
1453 tk->i_end += i_read;
1455 p_sys->stat.i_read_count++;
1459 /****************************************************************************
1461 ****************************************************************************/
1463 * Read from the stream untill first newline.
1464 * \param s Stream handle to read from
1465 * \return A pointer to the allocated output string. You need to free this when you are done.
1467 #define STREAM_PROBE_LINE 2048
1468 #define STREAM_LINE_MAX (2048*100)
1469 char *stream_ReadLine( stream_t *s )
1471 char *p_line = NULL;
1472 int i_line = 0, i_read = 0;
1477 const uint8_t *p_data;
1481 /* Probe new data */
1482 i_data = stream_Peek( s, &p_data, STREAM_PROBE_LINE );
1483 if( i_data <= 0 ) break; /* No more data */
1486 i_pos = stream_Tell( s );
1487 if( i_pos == 0 && i_data >= 2 )
1489 const char *psz_encoding = NULL;
1491 if( !memcmp( p_data, "\xFF\xFE", 2 ) )
1493 psz_encoding = "UTF-16LE";
1494 s->p_text->b_little_endian = true;
1496 else if( !memcmp( p_data, "\xFE\xFF", 2 ) )
1498 psz_encoding = "UTF-16BE";
1501 /* Open the converter if we need it */
1502 if( psz_encoding != NULL )
1504 msg_Dbg( s, "UTF-16 BOM detected" );
1505 s->p_text->i_char_width = 2;
1506 s->p_text->conv = vlc_iconv_open( "UTF-8", psz_encoding );
1507 if( s->p_text->conv == (vlc_iconv_t)-1 )
1508 msg_Err( s, "iconv_open failed" );
1512 if( i_data % s->p_text->i_char_width )
1514 /* keep i_char_width boundary */
1515 i_data = i_data - ( i_data % s->p_text->i_char_width );
1516 msg_Warn( s, "the read is not i_char_width compatible");
1522 /* Check if there is an EOL */
1523 if( s->p_text->i_char_width == 1 )
1525 /* UTF-8: 0A <LF> */
1526 psz_eol = memchr( p_data, '\n', i_data );
1527 if( psz_eol == NULL )
1528 /* UTF-8: 0D <CR> */
1529 psz_eol = memchr( p_data, '\r', i_data );
1533 const uint8_t *p_last = p_data + i_data - s->p_text->i_char_width;
1534 uint16_t eol = s->p_text->b_little_endian ? 0x0A00 : 0x00A0;
1536 assert( s->p_text->i_char_width == 2 );
1538 /* UTF-16: 000A <LF> */
1539 for( const uint8_t *p = p_data; p <= p_last; p += 2 )
1541 if( U16_AT( p ) == eol )
1543 psz_eol = (char *)p + 1;
1548 if( psz_eol == NULL )
1549 { /* UTF-16: 000D <CR> */
1550 eol = s->p_text->b_little_endian ? 0x0D00 : 0x00D0;
1551 for( const uint8_t *p = p_data; p <= p_last; p += 2 )
1553 if( U16_AT( p ) == eol )
1555 psz_eol = (char *)p + 1;
1564 i_data = (psz_eol - (char *)p_data) + 1;
1565 p_line = realloc_or_free( p_line,
1566 i_line + i_data + s->p_text->i_char_width ); /* add \0 */
1569 i_data = stream_Read( s, &p_line[i_line], i_data );
1570 if( i_data <= 0 ) break; /* Hmmm */
1571 i_line += i_data - s->p_text->i_char_width; /* skip \n */;
1574 /* We have our line */
1578 /* Read data (+1 for easy \0 append) */
1579 p_line = realloc_or_free( p_line,
1580 i_line + STREAM_PROBE_LINE + s->p_text->i_char_width );
1583 i_data = stream_Read( s, &p_line[i_line], STREAM_PROBE_LINE );
1584 if( i_data <= 0 ) break; /* Hmmm */
1588 if( i_read >= STREAM_LINE_MAX )
1589 goto error; /* line too long */
1595 for( j = 0; j < s->p_text->i_char_width; j++ )
1597 p_line[i_line + j] = '\0';
1599 i_line += s->p_text->i_char_width; /* the added \0 */
1600 if( s->p_text->i_char_width > 1 )
1603 size_t i_in = 0, i_out = 0;
1604 const char * p_in = NULL;
1605 char * p_out = NULL;
1606 char * psz_new_line = NULL;
1609 /* UTF-8 needs at most 150% of the buffer as many as UTF-16 */
1610 i_new_line = i_line * 3 / 2;
1611 psz_new_line = malloc( i_new_line );
1612 if( psz_new_line == NULL )
1614 i_in = (size_t)i_line;
1615 i_out = (size_t)i_new_line;
1617 p_out = psz_new_line;
1619 if( vlc_iconv( s->p_text->conv, &p_in, &i_in, &p_out, &i_out ) == (size_t)-1 )
1621 msg_Err( s, "iconv failed" );
1622 msg_Dbg( s, "original: %d, in %d, out %d", i_line, (int)i_in, (int)i_out );
1625 p_line = psz_new_line;
1626 i_line = (size_t)i_new_line - i_out; /* does not include \0 */
1629 /* Remove trailing LF/CR */
1630 while( i_line >= 2 && ( p_line[i_line-2] == '\r' ||
1631 p_line[i_line-2] == '\n') ) i_line--;
1633 /* Make sure the \0 is there */
1634 p_line[i_line-1] = '\0';
1640 /* We failed to read any data, probably EOF */
1644 if( s->p_text->conv != (vlc_iconv_t)(-1) )
1645 vlc_iconv_close( s->p_text->conv );
1646 s->p_text->conv = (vlc_iconv_t)(-1);
1650 /****************************************************************************
1651 * Access reading/seeking wrappers to handle concatenated streams.
1652 ****************************************************************************/
1653 static int AReadStream( stream_t *s, void *p_read, unsigned int i_read )
1655 stream_sys_t *p_sys = s->p_sys;
1656 access_t *p_access = p_sys->p_access;
1657 input_thread_t *p_input = s->p_input;
1658 int i_read_orig = i_read;
1660 if( !p_sys->i_list )
1662 i_read = p_access->pf_read( p_access, p_read, i_read );
1667 vlc_mutex_lock( &p_input->p->counters.counters_lock );
1668 stats_Update( p_input->p->counters.p_read_bytes, i_read, &total );
1669 stats_Update( p_input->p->counters.p_input_bitrate, total, NULL );
1670 stats_Update( p_input->p->counters.p_read_packets, 1, NULL );
1671 vlc_mutex_unlock( &p_input->p->counters.counters_lock );
1676 i_read = p_sys->p_list_access->pf_read( p_sys->p_list_access, p_read,
1679 /* If we reached an EOF then switch to the next stream in the list */
1680 if( i_read == 0 && p_sys->i_list_index + 1 < p_sys->i_list )
1682 char *psz_name = p_sys->list[++p_sys->i_list_index]->psz_path;
1683 access_t *p_list_access;
1685 msg_Dbg( s, "opening input `%s'", psz_name );
1687 p_list_access = access_New( s, s->p_input, p_access->psz_access, "", psz_name );
1689 if( !p_list_access ) return 0;
1691 if( p_sys->p_list_access != p_access )
1692 access_Delete( p_sys->p_list_access );
1694 p_sys->p_list_access = p_list_access;
1696 /* We have to read some data */
1697 return AReadStream( s, p_read, i_read_orig );
1700 /* Update read bytes in input */
1705 vlc_mutex_lock( &p_input->p->counters.counters_lock );
1706 stats_Update( p_input->p->counters.p_read_bytes, i_read, &total );
1707 stats_Update( p_input->p->counters.p_input_bitrate, total, NULL );
1708 stats_Update( p_input->p->counters.p_read_packets, 1, NULL );
1709 vlc_mutex_unlock( &p_input->p->counters.counters_lock );
1714 static block_t *AReadBlock( stream_t *s, bool *pb_eof )
1716 stream_sys_t *p_sys = s->p_sys;
1717 access_t *p_access = p_sys->p_access;
1718 input_thread_t *p_input = s->p_input;
1722 if( !p_sys->i_list )
1724 p_block = p_access->pf_block( p_access );
1725 if( pb_eof ) *pb_eof = p_access->info.b_eof;
1726 if( p_input && p_block && libvlc_stats (p_access) )
1730 vlc_mutex_lock( &p_input->p->counters.counters_lock );
1731 stats_Update( p_input->p->counters.p_read_bytes,
1732 p_block->i_buffer, &total );
1733 stats_Update( p_input->p->counters.p_input_bitrate,
1735 stats_Update( p_input->p->counters.p_read_packets, 1, NULL );
1736 vlc_mutex_unlock( &p_input->p->counters.counters_lock );
1741 p_block = p_sys->p_list_access->pf_block( p_sys->p_list_access );
1742 b_eof = p_sys->p_list_access->info.b_eof;
1743 if( pb_eof ) *pb_eof = b_eof;
1745 /* If we reached an EOF then switch to the next stream in the list */
1746 if( !p_block && b_eof && p_sys->i_list_index + 1 < p_sys->i_list )
1748 char *psz_name = p_sys->list[++p_sys->i_list_index]->psz_path;
1749 access_t *p_list_access;
1751 msg_Dbg( s, "opening input `%s'", psz_name );
1753 p_list_access = access_New( s, s->p_input, p_access->psz_access, "", psz_name );
1755 if( !p_list_access ) return 0;
1757 if( p_sys->p_list_access != p_access )
1758 access_Delete( p_sys->p_list_access );
1760 p_sys->p_list_access = p_list_access;
1762 /* We have to read some data */
1763 return AReadBlock( s, pb_eof );
1771 vlc_mutex_lock( &p_input->p->counters.counters_lock );
1772 stats_Update( p_input->p->counters.p_read_bytes,
1773 p_block->i_buffer, &total );
1774 stats_Update( p_input->p->counters.p_input_bitrate, total, NULL );
1775 stats_Update( p_input->p->counters.p_read_packets, 1 , NULL);
1776 vlc_mutex_unlock( &p_input->p->counters.counters_lock );
1782 static int ASeek( stream_t *s, uint64_t i_pos )
1784 stream_sys_t *p_sys = s->p_sys;
1785 access_t *p_access = p_sys->p_access;
1787 /* Check which stream we need to access */
1793 access_t *p_list_access = 0;
1795 for( i = 0; i < p_sys->i_list - 1; i++ )
1797 if( i_pos < p_sys->list[i]->i_size + i_size ) break;
1798 i_size += p_sys->list[i]->i_size;
1800 psz_name = p_sys->list[i]->psz_path;
1802 if( i != p_sys->i_list_index )
1803 msg_Dbg( s, "opening input `%s'", psz_name );
1805 if( i != p_sys->i_list_index && i != 0 )
1808 access_New( s, s->p_input, p_access->psz_access, "", psz_name );
1810 else if( i != p_sys->i_list_index )
1812 p_list_access = p_access;
1817 if( p_sys->p_list_access != p_access )
1818 access_Delete( p_sys->p_list_access );
1820 p_sys->p_list_access = p_list_access;
1823 p_sys->i_list_index = i;
1824 return p_sys->p_list_access->pf_seek( p_sys->p_list_access,
1828 return p_access->pf_seek( p_access, i_pos );
1833 * Try to read "i_read" bytes into a buffer pointed by "p_read". If
1834 * "p_read" is NULL then data are skipped instead of read.
1835 * \return The real number of bytes read/skip. If this value is less
1836 * than i_read that means that it's the end of the stream.
1837 * \note stream_Read increments the stream position, and when p_read is NULL,
1838 * this is its only task.
1840 int stream_Read( stream_t *s, void *p_read, int i_read )
1842 return s->pf_read( s, p_read, i_read );
1846 * Store in pp_peek a pointer to the next "i_peek" bytes in the stream
1847 * \return The real number of valid bytes. If it's less
1848 * or equal to 0, *pp_peek is invalid.
1849 * \note pp_peek is a pointer to internal buffer and it will be invalid as
1850 * soons as other stream_* functions are called.
1851 * \note Contrary to stream_Read, stream_Peek doesn't modify the stream
1852 * position, and doesn't necessarily involve copying of data. It's mainly
1853 * used by the modules to quickly probe the (head of the) stream.
1854 * \note Due to input limitation, the return value could be less than i_peek
1855 * without meaning the end of the stream (but only when you have i_peek >=
1856 * p_input->i_bufsize)
1858 int stream_Peek( stream_t *s, const uint8_t **pp_peek, int i_peek )
1860 return s->pf_peek( s, pp_peek, i_peek );
1864 * Use to control the "stream_t *". Look at #stream_query_e for
1865 * possible "i_query" value and format arguments. Return VLC_SUCCESS
1866 * if ... succeed ;) and VLC_EGENERIC if failed or unimplemented
1868 int stream_vaControl( stream_t *s, int i_query, va_list args )
1870 return s->pf_control( s, i_query, args );
1876 void stream_Delete( stream_t *s )
1881 int stream_Control( stream_t *s, int i_query, ... )
1887 return VLC_EGENERIC;
1889 va_start( args, i_query );
1890 i_result = s->pf_control( s, i_query, args );
1896 * Read "i_size" bytes and store them in a block_t.
1897 * It always read i_size bytes unless you are at the end of the stream
1898 * where it return what is available.
1900 block_t *stream_Block( stream_t *s, int i_size )
1902 if( i_size <= 0 ) return NULL;
1904 /* emulate block read */
1905 block_t *p_bk = block_Alloc( i_size );
1908 int i_read = stream_Read( s, p_bk->p_buffer, i_size );
1911 p_bk->i_buffer = i_read;
1914 block_Release( p_bk );
1920 * Read the remaining of the data if there is less than i_max_size bytes, otherwise
1923 * The stream position is unknown after the call.
1925 block_t *stream_BlockRemaining( stream_t *s, int i_max_size )
1927 int i_allocate = __MIN(1000000, i_max_size);
1928 int64_t i_size = stream_Size( s );
1931 int64_t i_position = stream_Tell( s );
1932 if( i_position + i_max_size < i_size )
1934 msg_Err( s, "Remaining stream size is greater than %d bytes",
1938 i_allocate = i_size - i_position;
1940 if( i_allocate <= 0 )
1943 block_t *p_block = block_Alloc( i_allocate );
1947 int i_read = stream_Read( s, &p_block->p_buffer[i_index],
1948 p_block->i_buffer - i_index);
1952 i_max_size -= i_read;
1953 if( i_max_size <= 0 )
1955 p_block = block_Realloc( p_block, 0, p_block->i_buffer +
1956 __MIN(1000000, i_max_size) );
1959 p_block->i_buffer = i_index;