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 #define static_control_match(foo) \
543 static_assert((unsigned) STREAM_##foo == ACCESS_##foo, "Mismatch")
545 /****************************************************************************
547 ****************************************************************************/
548 static int AStreamControl( stream_t *s, int i_query, va_list args )
550 stream_sys_t *p_sys = s->p_sys;
551 access_t *p_access = p_sys->p_access;
553 static_control_match(CAN_SEEK);
554 static_control_match(CAN_FASTSEEK);
555 static_control_match(CAN_PAUSE);
556 static_control_match(CAN_CONTROL_PACE);
557 static_control_match(GET_TITLE_INFO);
558 static_control_match(GET_META);
559 static_control_match(GET_CONTENT_TYPE);
560 static_control_match(GET_SIGNAL);
561 static_control_match(SET_PAUSE_STATE);
562 static_control_match(SET_TITLE);
563 static_control_match(SET_SEEKPOINT);
564 static_control_match(SET_PRIVATE_ID_STATE);
565 static_control_match(SET_PRIVATE_ID_CA);
566 static_control_match(GET_PRIVATE_ID_STATE);
570 case STREAM_CAN_SEEK:
571 case STREAM_CAN_FASTSEEK:
572 case STREAM_CAN_PAUSE:
573 case STREAM_CAN_CONTROL_PACE:
574 case STREAM_GET_TITLE_INFO:
575 case STREAM_GET_META:
576 case STREAM_GET_CONTENT_TYPE:
577 case STREAM_GET_SIGNAL:
578 case STREAM_SET_PAUSE_STATE:
579 case STREAM_SET_PRIVATE_ID_STATE:
580 case STREAM_SET_PRIVATE_ID_CA:
581 case STREAM_GET_PRIVATE_ID_STATE:
582 return access_vaControl( p_access, i_query, args );
584 case STREAM_GET_SIZE:
586 uint64_t *pi_64 = va_arg( args, uint64_t * );
587 if( s->p_sys->i_list )
591 for( i = 0; i < s->p_sys->i_list; i++ )
592 *pi_64 += s->p_sys->list[i]->i_size;
595 *pi_64 = access_GetSize( p_access );
599 case STREAM_GET_POSITION:
600 *va_arg( args, uint64_t * ) = p_sys->i_pos;
603 case STREAM_SET_POSITION:
605 uint64_t offset = va_arg( args, uint64_t );
606 switch( p_sys->method )
608 case STREAM_METHOD_BLOCK:
609 return AStreamSeekBlock( s, offset );
610 case STREAM_METHOD_STREAM:
611 return AStreamSeekStream( s, offset );
618 case STREAM_UPDATE_SIZE:
619 AStreamControlUpdate( s );
622 case STREAM_SET_TITLE:
623 case STREAM_SET_SEEKPOINT:
625 int ret = access_vaControl( p_access, i_query, args );
626 if( ret == VLC_SUCCESS )
627 AStreamControlReset( s );
631 case STREAM_SET_RECORD_STATE:
633 msg_Err( s, "invalid stream_vaControl query=0x%x", i_query );
639 /****************************************************************************
641 ****************************************************************************/
642 static void AStreamPrebufferBlock( stream_t *s )
644 stream_sys_t *p_sys = s->p_sys;
649 msg_Dbg( s, "starting pre-buffering" );
653 const int64_t i_date = mdate();
657 if( !vlc_object_alive(s) || p_sys->block.i_size > STREAM_CACHE_PREBUFFER_SIZE )
662 p_sys->stat.i_bytes = p_sys->block.i_size;
663 p_sys->stat.i_read_time = i_date - i_start;
664 i_byterate = ( INT64_C(1000000) * p_sys->stat.i_bytes ) /
665 (p_sys->stat.i_read_time + 1);
667 msg_Dbg( s, "prebuffering done %"PRId64" bytes in %"PRId64"s - "
670 p_sys->stat.i_read_time / INT64_C(1000000),
676 if( ( b = AReadBlock( s, &b_eof ) ) == NULL )
685 /* Append the block */
686 p_sys->block.i_size += b->i_buffer;
687 *p_sys->block.pp_last = b;
688 p_sys->block.pp_last = &b->p_next;
690 p_sys->stat.i_read_count++;
697 msg_Dbg( s, "received first data after %d ms",
698 (int)((i_first-i_start)/1000) );
702 p_sys->block.p_current = p_sys->block.p_first;
705 static int AStreamRefillBlock( stream_t *s );
707 static int AStreamReadBlock( stream_t *s, void *p_read, unsigned int i_read )
709 stream_sys_t *p_sys = s->p_sys;
711 uint8_t *p_data = p_read;
712 unsigned int i_data = 0;
715 if( p_sys->block.p_current == NULL )
720 /* seek within this stream if possible, else use plain old read and discard */
721 stream_sys_t *p_sys = s->p_sys;
722 access_t *p_access = p_sys->p_access;
724 access_Control( p_access, ACCESS_CAN_SEEK, &b_aseek );
726 return AStreamSeekBlock( s, p_sys->i_pos + i_read ) ? 0 : i_read;
729 while( i_data < i_read )
732 p_sys->block.p_current->i_buffer - p_sys->block.i_offset;
733 unsigned int i_copy = VLC_CLIP( (unsigned int)i_current, 0, i_read - i_data);
739 &p_sys->block.p_current->p_buffer[p_sys->block.i_offset],
745 p_sys->block.i_offset += i_copy;
746 if( p_sys->block.i_offset >= p_sys->block.p_current->i_buffer )
748 /* Current block is now empty, switch to next */
749 if( p_sys->block.p_current )
751 p_sys->block.i_offset = 0;
752 p_sys->block.p_current = p_sys->block.p_current->p_next;
754 /*Get a new block if needed */
755 if( !p_sys->block.p_current && AStreamRefillBlock( s ) )
762 p_sys->i_pos += i_data;
766 static int AStreamPeekBlock( stream_t *s, const uint8_t **pp_peek, unsigned int i_read )
768 stream_sys_t *p_sys = s->p_sys;
770 unsigned int i_data = 0;
772 unsigned int i_offset;
774 if( p_sys->block.p_current == NULL ) return 0; /* EOF */
776 /* We can directly give a pointer over our buffer */
777 if( i_read <= p_sys->block.p_current->i_buffer - p_sys->block.i_offset )
779 *pp_peek = &p_sys->block.p_current->p_buffer[p_sys->block.i_offset];
783 /* We need to create a local copy */
784 if( p_sys->i_peek < i_read )
786 p_sys->p_peek = realloc_or_free( p_sys->p_peek, i_read );
792 p_sys->i_peek = i_read;
795 /* Fill enough data */
796 while( p_sys->block.i_size - (p_sys->i_pos - p_sys->block.i_start)
799 block_t **pp_last = p_sys->block.pp_last;
801 if( AStreamRefillBlock( s ) ) break;
803 /* Our buffer are probably filled enough, don't try anymore */
804 if( pp_last == p_sys->block.pp_last ) break;
807 /* Copy what we have */
808 b = p_sys->block.p_current;
809 i_offset = p_sys->block.i_offset;
810 p_data = p_sys->p_peek;
812 while( b && i_data < i_read )
814 unsigned int i_current = __MAX(b->i_buffer - i_offset,0);
815 int i_copy = __MIN( i_current, i_read - i_data );
817 memcpy( p_data, &b->p_buffer[i_offset], i_copy );
822 if( i_offset >= b->i_buffer )
829 *pp_peek = p_sys->p_peek;
833 static int AStreamSeekBlock( stream_t *s, uint64_t i_pos )
835 stream_sys_t *p_sys = s->p_sys;
836 access_t *p_access = p_sys->p_access;
837 int64_t i_offset = i_pos - p_sys->block.i_start;
840 /* We already have thoses data, just update p_current/i_offset */
841 if( i_offset >= 0 && (uint64_t)i_offset < p_sys->block.i_size )
843 block_t *b = p_sys->block.p_first;
846 while( i_current + b->i_buffer < (uint64_t)i_offset )
848 i_current += b->i_buffer;
852 p_sys->block.p_current = b;
853 p_sys->block.i_offset = i_offset - i_current;
855 p_sys->i_pos = i_pos;
860 /* We may need to seek or to read data */
864 access_Control( p_access, ACCESS_CAN_SEEK, &b_aseek );
868 msg_Err( s, "backward seeking impossible (access not seekable)" );
876 bool b_aseek, b_aseekfast;
878 access_Control( p_access, ACCESS_CAN_SEEK, &b_aseek );
879 access_Control( p_access, ACCESS_CAN_FASTSEEK, &b_aseekfast );
884 msg_Warn( s, "%"PRId64" bytes need to be skipped "
885 "(access non seekable)",
886 i_offset - p_sys->block.i_size );
890 int64_t i_skip = i_offset - p_sys->block.i_size;
892 /* Avg bytes per packets */
893 int i_avg = p_sys->stat.i_bytes / p_sys->stat.i_read_count;
894 /* TODO compute a seek cost instead of fixed threshold */
895 int i_th = b_aseekfast ? 1 : 5;
897 if( i_skip <= i_th * i_avg &&
898 i_skip < STREAM_CACHE_SIZE )
903 msg_Dbg( s, "b_seek=%d th*avg=%d skip=%"PRId64,
904 b_seek, i_th*i_avg, i_skip );
910 int64_t i_start, i_end;
911 /* Do the access seek */
913 if( ASeek( s, i_pos ) ) return VLC_EGENERIC;
917 block_ChainRelease( p_sys->block.p_first );
920 p_sys->block.i_start = p_sys->i_pos = i_pos;
921 p_sys->block.i_offset = 0;
922 p_sys->block.p_current = NULL;
923 p_sys->block.i_size = 0;
924 p_sys->block.p_first = NULL;
925 p_sys->block.pp_last = &p_sys->block.p_first;
928 if( AStreamRefillBlock( s ) )
932 p_sys->stat.i_seek_time += i_end - i_start;
933 p_sys->stat.i_seek_count++;
940 while( p_sys->block.p_current &&
941 p_sys->i_pos + p_sys->block.p_current->i_buffer - p_sys->block.i_offset <= i_pos )
943 p_sys->i_pos += p_sys->block.p_current->i_buffer - p_sys->block.i_offset;
944 p_sys->block.p_current = p_sys->block.p_current->p_next;
945 p_sys->block.i_offset = 0;
947 if( !p_sys->block.p_current && AStreamRefillBlock( s ) )
949 if( p_sys->i_pos != i_pos )
953 while( p_sys->block.i_start + p_sys->block.i_size < i_pos );
955 p_sys->block.i_offset += i_pos - p_sys->i_pos;
956 p_sys->i_pos = i_pos;
964 static int AStreamRefillBlock( stream_t *s )
966 stream_sys_t *p_sys = s->p_sys;
970 while( p_sys->block.i_size >= STREAM_CACHE_SIZE &&
971 p_sys->block.p_first != p_sys->block.p_current )
973 block_t *b = p_sys->block.p_first;
975 p_sys->block.i_start += b->i_buffer;
976 p_sys->block.i_size -= b->i_buffer;
977 p_sys->block.p_first = b->p_next;
981 if( p_sys->block.i_size >= STREAM_CACHE_SIZE &&
982 p_sys->block.p_current == p_sys->block.p_first &&
983 p_sys->block.p_current->p_next ) /* At least 2 packets */
985 /* Enough data, don't read more */
989 /* Now read a new block */
990 const int64_t i_start = mdate();
995 if( !vlc_object_alive(s) )
999 if( ( b = AReadBlock( s, &b_eof ) ) )
1002 return VLC_EGENERIC;
1005 p_sys->stat.i_read_time += mdate() - i_start;
1008 /* Append the block */
1009 p_sys->block.i_size += b->i_buffer;
1010 *p_sys->block.pp_last = b;
1011 p_sys->block.pp_last = &b->p_next;
1014 if( p_sys->block.p_current == NULL )
1015 p_sys->block.p_current = b;
1018 p_sys->stat.i_bytes += b->i_buffer;
1019 p_sys->stat.i_read_count++;
1027 /****************************************************************************
1029 ****************************************************************************/
1030 static int AStreamRefillStream( stream_t *s );
1031 static int AStreamReadNoSeekStream( stream_t *s, void *p_read, unsigned int i_read );
1033 static int AStreamReadStream( stream_t *s, void *p_read, unsigned int i_read )
1035 stream_sys_t *p_sys = s->p_sys;
1039 const uint64_t i_pos_wanted = p_sys->i_pos + i_read;
1041 if( AStreamSeekStream( s, i_pos_wanted ) )
1043 if( p_sys->i_pos != i_pos_wanted )
1048 return AStreamReadNoSeekStream( s, p_read, i_read );
1051 static int AStreamPeekStream( stream_t *s, const uint8_t **pp_peek, unsigned int i_read )
1053 stream_sys_t *p_sys = s->p_sys;
1054 stream_track_t *tk = &p_sys->stream.tk[p_sys->stream.i_tk];
1057 if( tk->i_start >= tk->i_end ) return 0; /* EOF */
1060 msg_Dbg( s, "AStreamPeekStream: %d pos=%"PRId64" tk=%d "
1061 "start=%"PRId64" offset=%d end=%"PRId64,
1062 i_read, p_sys->i_pos, p_sys->stream.i_tk,
1063 tk->i_start, p_sys->stream.i_offset, tk->i_end );
1066 /* Avoid problem, but that should *never* happen */
1067 if( i_read > STREAM_CACHE_TRACK_SIZE / 2 )
1068 i_read = STREAM_CACHE_TRACK_SIZE / 2;
1070 while( tk->i_end < tk->i_start + p_sys->stream.i_offset + i_read )
1072 if( p_sys->stream.i_used <= 1 )
1074 /* Be sure we will read something */
1075 p_sys->stream.i_used += tk->i_start + p_sys->stream.i_offset + i_read - tk->i_end;
1077 if( AStreamRefillStream( s ) ) break;
1080 if( tk->i_end < tk->i_start + p_sys->stream.i_offset + i_read )
1082 i_read = tk->i_end - tk->i_start - p_sys->stream.i_offset;
1086 /* Now, direct pointer or a copy ? */
1087 i_off = (tk->i_start + p_sys->stream.i_offset) % STREAM_CACHE_TRACK_SIZE;
1088 if( i_off + i_read <= STREAM_CACHE_TRACK_SIZE )
1090 *pp_peek = &tk->p_buffer[i_off];
1094 if( p_sys->i_peek < i_read )
1096 p_sys->p_peek = realloc_or_free( p_sys->p_peek, i_read );
1097 if( !p_sys->p_peek )
1102 p_sys->i_peek = i_read;
1105 memcpy( p_sys->p_peek, &tk->p_buffer[i_off],
1106 STREAM_CACHE_TRACK_SIZE - i_off );
1107 memcpy( &p_sys->p_peek[STREAM_CACHE_TRACK_SIZE - i_off],
1108 &tk->p_buffer[0], i_read - (STREAM_CACHE_TRACK_SIZE - i_off) );
1110 *pp_peek = p_sys->p_peek;
1114 static int AStreamSeekStream( stream_t *s, uint64_t i_pos )
1116 stream_sys_t *p_sys = s->p_sys;
1118 stream_track_t *p_current = &p_sys->stream.tk[p_sys->stream.i_tk];
1119 access_t *p_access = p_sys->p_access;
1121 if( p_current->i_start >= p_current->i_end && i_pos >= p_current->i_end )
1125 msg_Dbg( s, "AStreamSeekStream: to %"PRId64" pos=%"PRId64
1126 " tk=%d start=%"PRId64" offset=%d end=%"PRId64,
1127 i_pos, p_sys->i_pos, p_sys->stream.i_tk,
1129 p_sys->stream.i_offset,
1134 access_Control( p_access, ACCESS_CAN_SEEK, &b_aseek );
1135 if( !b_aseek && i_pos < p_current->i_start )
1137 msg_Warn( s, "AStreamSeekStream: can't seek" );
1138 return VLC_EGENERIC;
1142 access_Control( p_access, ACCESS_CAN_FASTSEEK, &b_afastseek );
1144 /* FIXME compute seek cost (instead of static 'stupid' value) */
1145 uint64_t i_skip_threshold;
1147 i_skip_threshold = b_afastseek ? 128 : 3*p_sys->stream.i_read_size;
1149 i_skip_threshold = INT64_MAX;
1151 /* Date the current track */
1152 p_current->i_date = mdate();
1154 /* Search a new track slot */
1155 stream_track_t *tk = NULL;
1158 /* Prefer the current track */
1159 if( p_current->i_start <= i_pos && i_pos <= p_current->i_end + i_skip_threshold )
1162 i_tk_idx = p_sys->stream.i_tk;
1166 /* Try to maximize already read data */
1167 for( int i = 0; i < STREAM_CACHE_TRACK; i++ )
1169 stream_track_t *t = &p_sys->stream.tk[i];
1171 if( t->i_start > i_pos || i_pos > t->i_end )
1174 if( !tk || tk->i_end < t->i_end )
1183 /* Use the oldest unused */
1184 for( int i = 0; i < STREAM_CACHE_TRACK; i++ )
1186 stream_track_t *t = &p_sys->stream.tk[i];
1188 if( !tk || tk->i_date > t->i_date )
1195 assert( i_tk_idx >= 0 && i_tk_idx < STREAM_CACHE_TRACK );
1197 if( tk != p_current )
1198 i_skip_threshold = 0;
1199 if( tk->i_start <= i_pos && i_pos <= tk->i_end + i_skip_threshold )
1202 msg_Err( s, "AStreamSeekStream: reusing %d start=%"PRId64
1203 " end=%"PRId64"(%s)",
1204 i_tk_idx, tk->i_start, tk->i_end,
1205 tk != p_current ? "seek" : i_pos > tk->i_end ? "skip" : "noseek" );
1207 if( tk != p_current )
1211 /* Seek at the end of the buffer
1212 * TODO it is stupid to seek now, it would be better to delay it
1214 if( ASeek( s, tk->i_end ) )
1215 return VLC_EGENERIC;
1217 else if( i_pos > tk->i_end )
1219 uint64_t i_skip = i_pos - tk->i_end;
1222 const int i_read_max = __MIN( 10 * STREAM_READ_ATONCE, i_skip );
1223 if( AStreamReadNoSeekStream( s, NULL, i_read_max ) != i_read_max )
1224 return VLC_EGENERIC;
1225 i_skip -= i_read_max;
1232 msg_Err( s, "AStreamSeekStream: hard seek" );
1234 /* Nothing good, seek and choose oldest segment */
1235 if( ASeek( s, i_pos ) )
1236 return VLC_EGENERIC;
1238 tk->i_start = i_pos;
1241 p_sys->stream.i_offset = i_pos - tk->i_start;
1242 p_sys->stream.i_tk = i_tk_idx;
1243 p_sys->i_pos = i_pos;
1245 /* If there is not enough data left in the track, refill */
1246 /* TODO How to get a correct value for
1247 * - refilling threshold
1248 * - how much to refill
1250 if( tk->i_end < tk->i_start + p_sys->stream.i_offset + p_sys->stream.i_read_size )
1252 if( p_sys->stream.i_used < STREAM_READ_ATONCE / 2 )
1253 p_sys->stream.i_used = STREAM_READ_ATONCE / 2;
1255 if( AStreamRefillStream( s ) && i_pos >= tk->i_end )
1256 return VLC_EGENERIC;
1261 static int AStreamReadNoSeekStream( stream_t *s, void *p_read, unsigned int i_read )
1263 stream_sys_t *p_sys = s->p_sys;
1264 stream_track_t *tk = &p_sys->stream.tk[p_sys->stream.i_tk];
1266 uint8_t *p_data = (uint8_t *)p_read;
1267 unsigned int i_data = 0;
1269 if( tk->i_start >= tk->i_end )
1273 msg_Dbg( s, "AStreamReadStream: %d pos=%"PRId64" tk=%d start=%"PRId64
1274 " offset=%d end=%"PRId64,
1275 i_read, p_sys->i_pos, p_sys->stream.i_tk,
1276 tk->i_start, p_sys->stream.i_offset, tk->i_end );
1279 while( i_data < i_read )
1281 unsigned i_off = (tk->i_start + p_sys->stream.i_offset) % STREAM_CACHE_TRACK_SIZE;
1282 unsigned int i_current =
1283 __MIN( tk->i_end - tk->i_start - p_sys->stream.i_offset,
1284 STREAM_CACHE_TRACK_SIZE - i_off );
1285 int i_copy = __MIN( i_current, i_read - i_data );
1287 if( i_copy <= 0 ) break; /* EOF */
1290 /* msg_Dbg( s, "AStreamReadStream: copy %d", i_copy ); */
1293 memcpy( p_data, &tk->p_buffer[i_off], i_copy );
1297 p_sys->stream.i_offset += i_copy;
1299 /* Update pos now */
1300 p_sys->i_pos += i_copy;
1303 p_sys->stream.i_used += i_copy;
1305 if( tk->i_end + i_data <= tk->i_start + p_sys->stream.i_offset + i_read )
1307 const unsigned i_read_requested = VLC_CLIP( i_read - i_data,
1308 STREAM_READ_ATONCE / 2,
1309 STREAM_READ_ATONCE * 10 );
1311 if( p_sys->stream.i_used < i_read_requested )
1312 p_sys->stream.i_used = i_read_requested;
1314 if( AStreamRefillStream( s ) )
1317 if( tk->i_start >= tk->i_end ) break;
1326 static int AStreamRefillStream( stream_t *s )
1328 stream_sys_t *p_sys = s->p_sys;
1329 stream_track_t *tk = &p_sys->stream.tk[p_sys->stream.i_tk];
1331 /* We read but won't increase i_start after initial start + offset */
1333 __MIN( p_sys->stream.i_used, STREAM_CACHE_TRACK_SIZE -
1334 (tk->i_end - tk->i_start - p_sys->stream.i_offset) );
1335 bool b_read = false;
1336 int64_t i_start, i_stop;
1338 if( i_toread <= 0 ) return VLC_EGENERIC; /* EOF */
1341 msg_Dbg( s, "AStreamRefillStream: used=%d toread=%d",
1342 p_sys->stream.i_used, i_toread );
1346 while( i_toread > 0 )
1348 int i_off = tk->i_end % STREAM_CACHE_TRACK_SIZE;
1351 if( !vlc_object_alive(s) )
1352 return VLC_EGENERIC;
1354 i_read = __MIN( i_toread, STREAM_CACHE_TRACK_SIZE - i_off );
1355 i_read = AReadStream( s, &tk->p_buffer[i_off], i_read );
1357 /* msg_Dbg( s, "AStreamRefillStream: read=%d", i_read ); */
1362 else if( i_read == 0 )
1365 return VLC_EGENERIC;
1371 tk->i_end += i_read;
1373 /* Windows of STREAM_CACHE_TRACK_SIZE */
1374 if( tk->i_start + STREAM_CACHE_TRACK_SIZE < tk->i_end )
1376 unsigned i_invalid = tk->i_end - tk->i_start - STREAM_CACHE_TRACK_SIZE;
1378 tk->i_start += i_invalid;
1379 p_sys->stream.i_offset -= i_invalid;
1383 p_sys->stream.i_used -= i_read;
1385 p_sys->stat.i_bytes += i_read;
1386 p_sys->stat.i_read_count++;
1390 p_sys->stat.i_read_time += i_stop - i_start;
1395 static void AStreamPrebufferStream( stream_t *s )
1397 stream_sys_t *p_sys = s->p_sys;
1399 int64_t i_first = 0;
1402 msg_Dbg( s, "starting pre-buffering" );
1406 stream_track_t *tk = &p_sys->stream.tk[p_sys->stream.i_tk];
1408 int64_t i_date = mdate();
1410 int i_buffered = tk->i_end - tk->i_start;
1412 if( !vlc_object_alive(s) || i_buffered >= STREAM_CACHE_PREBUFFER_SIZE )
1417 p_sys->stat.i_bytes = i_buffered;
1418 p_sys->stat.i_read_time = i_date - i_start;
1419 i_byterate = ( INT64_C(1000000) * p_sys->stat.i_bytes ) /
1420 (p_sys->stat.i_read_time+1);
1422 msg_Dbg( s, "pre-buffering done %"PRId64" bytes in %"PRId64"s - "
1424 p_sys->stat.i_bytes,
1425 p_sys->stat.i_read_time / INT64_C(1000000),
1426 i_byterate / 1024 );
1431 i_read = STREAM_CACHE_TRACK_SIZE - i_buffered;
1432 i_read = __MIN( (int)p_sys->stream.i_read_size, i_read );
1433 i_read = AReadStream( s, &tk->p_buffer[i_buffered], i_read );
1436 else if( i_read == 0 )
1442 msg_Dbg( s, "received first data after %d ms",
1443 (int)((i_first-i_start)/1000) );
1446 tk->i_end += i_read;
1448 p_sys->stat.i_read_count++;
1452 /****************************************************************************
1454 ****************************************************************************/
1456 * Read from the stream untill first newline.
1457 * \param s Stream handle to read from
1458 * \return A pointer to the allocated output string. You need to free this when you are done.
1460 #define STREAM_PROBE_LINE 2048
1461 #define STREAM_LINE_MAX (2048*100)
1462 char *stream_ReadLine( stream_t *s )
1464 char *p_line = NULL;
1465 int i_line = 0, i_read = 0;
1470 const uint8_t *p_data;
1474 /* Probe new data */
1475 i_data = stream_Peek( s, &p_data, STREAM_PROBE_LINE );
1476 if( i_data <= 0 ) break; /* No more data */
1479 i_pos = stream_Tell( s );
1480 if( i_pos == 0 && i_data >= 2 )
1482 const char *psz_encoding = NULL;
1484 if( !memcmp( p_data, "\xFF\xFE", 2 ) )
1486 psz_encoding = "UTF-16LE";
1487 s->p_text->b_little_endian = true;
1489 else if( !memcmp( p_data, "\xFE\xFF", 2 ) )
1491 psz_encoding = "UTF-16BE";
1494 /* Open the converter if we need it */
1495 if( psz_encoding != NULL )
1497 msg_Dbg( s, "UTF-16 BOM detected" );
1498 s->p_text->i_char_width = 2;
1499 s->p_text->conv = vlc_iconv_open( "UTF-8", psz_encoding );
1500 if( s->p_text->conv == (vlc_iconv_t)-1 )
1501 msg_Err( s, "iconv_open failed" );
1505 if( i_data % s->p_text->i_char_width )
1507 /* keep i_char_width boundary */
1508 i_data = i_data - ( i_data % s->p_text->i_char_width );
1509 msg_Warn( s, "the read is not i_char_width compatible");
1515 /* Check if there is an EOL */
1516 if( s->p_text->i_char_width == 1 )
1518 /* UTF-8: 0A <LF> */
1519 psz_eol = memchr( p_data, '\n', i_data );
1520 if( psz_eol == NULL )
1521 /* UTF-8: 0D <CR> */
1522 psz_eol = memchr( p_data, '\r', i_data );
1526 const uint8_t *p_last = p_data + i_data - s->p_text->i_char_width;
1527 uint16_t eol = s->p_text->b_little_endian ? 0x0A00 : 0x00A0;
1529 assert( s->p_text->i_char_width == 2 );
1531 /* UTF-16: 000A <LF> */
1532 for( const uint8_t *p = p_data; p <= p_last; p += 2 )
1534 if( U16_AT( p ) == eol )
1536 psz_eol = (char *)p + 1;
1541 if( psz_eol == NULL )
1542 { /* UTF-16: 000D <CR> */
1543 eol = s->p_text->b_little_endian ? 0x0D00 : 0x00D0;
1544 for( const uint8_t *p = p_data; p <= p_last; p += 2 )
1546 if( U16_AT( p ) == eol )
1548 psz_eol = (char *)p + 1;
1557 i_data = (psz_eol - (char *)p_data) + 1;
1558 p_line = realloc_or_free( p_line,
1559 i_line + i_data + s->p_text->i_char_width ); /* add \0 */
1562 i_data = stream_Read( s, &p_line[i_line], i_data );
1563 if( i_data <= 0 ) break; /* Hmmm */
1564 i_line += i_data - s->p_text->i_char_width; /* skip \n */;
1567 /* We have our line */
1571 /* Read data (+1 for easy \0 append) */
1572 p_line = realloc_or_free( p_line,
1573 i_line + STREAM_PROBE_LINE + s->p_text->i_char_width );
1576 i_data = stream_Read( s, &p_line[i_line], STREAM_PROBE_LINE );
1577 if( i_data <= 0 ) break; /* Hmmm */
1581 if( i_read >= STREAM_LINE_MAX )
1582 goto error; /* line too long */
1588 for( j = 0; j < s->p_text->i_char_width; j++ )
1590 p_line[i_line + j] = '\0';
1592 i_line += s->p_text->i_char_width; /* the added \0 */
1593 if( s->p_text->i_char_width > 1 )
1596 size_t i_in = 0, i_out = 0;
1597 const char * p_in = NULL;
1598 char * p_out = NULL;
1599 char * psz_new_line = NULL;
1602 /* UTF-8 needs at most 150% of the buffer as many as UTF-16 */
1603 i_new_line = i_line * 3 / 2;
1604 psz_new_line = malloc( i_new_line );
1605 if( psz_new_line == NULL )
1607 i_in = (size_t)i_line;
1608 i_out = (size_t)i_new_line;
1610 p_out = psz_new_line;
1612 if( vlc_iconv( s->p_text->conv, &p_in, &i_in, &p_out, &i_out ) == (size_t)-1 )
1614 msg_Err( s, "iconv failed" );
1615 msg_Dbg( s, "original: %d, in %d, out %d", i_line, (int)i_in, (int)i_out );
1618 p_line = psz_new_line;
1619 i_line = (size_t)i_new_line - i_out; /* does not include \0 */
1622 /* Remove trailing LF/CR */
1623 while( i_line >= 2 && ( p_line[i_line-2] == '\r' ||
1624 p_line[i_line-2] == '\n') ) i_line--;
1626 /* Make sure the \0 is there */
1627 p_line[i_line-1] = '\0';
1633 /* We failed to read any data, probably EOF */
1637 if( s->p_text->conv != (vlc_iconv_t)(-1) )
1638 vlc_iconv_close( s->p_text->conv );
1639 s->p_text->conv = (vlc_iconv_t)(-1);
1643 /****************************************************************************
1644 * Access reading/seeking wrappers to handle concatenated streams.
1645 ****************************************************************************/
1646 static int AReadStream( stream_t *s, void *p_read, unsigned int i_read )
1648 stream_sys_t *p_sys = s->p_sys;
1649 access_t *p_access = p_sys->p_access;
1650 input_thread_t *p_input = s->p_input;
1651 int i_read_orig = i_read;
1653 if( !p_sys->i_list )
1655 i_read = p_access->pf_read( p_access, p_read, i_read );
1660 vlc_mutex_lock( &p_input->p->counters.counters_lock );
1661 stats_Update( p_input->p->counters.p_read_bytes, i_read, &total );
1662 stats_Update( p_input->p->counters.p_input_bitrate, total, NULL );
1663 stats_Update( p_input->p->counters.p_read_packets, 1, NULL );
1664 vlc_mutex_unlock( &p_input->p->counters.counters_lock );
1669 i_read = p_sys->p_list_access->pf_read( p_sys->p_list_access, p_read,
1672 /* If we reached an EOF then switch to the next stream in the list */
1673 if( i_read == 0 && p_sys->i_list_index + 1 < p_sys->i_list )
1675 char *psz_name = p_sys->list[++p_sys->i_list_index]->psz_path;
1676 access_t *p_list_access;
1678 msg_Dbg( s, "opening input `%s'", psz_name );
1680 p_list_access = access_New( s, s->p_input, p_access->psz_access, "", psz_name );
1682 if( !p_list_access ) return 0;
1684 if( p_sys->p_list_access != p_access )
1685 access_Delete( p_sys->p_list_access );
1687 p_sys->p_list_access = p_list_access;
1689 /* We have to read some data */
1690 return AReadStream( s, p_read, i_read_orig );
1693 /* Update read bytes in input */
1698 vlc_mutex_lock( &p_input->p->counters.counters_lock );
1699 stats_Update( p_input->p->counters.p_read_bytes, i_read, &total );
1700 stats_Update( p_input->p->counters.p_input_bitrate, total, NULL );
1701 stats_Update( p_input->p->counters.p_read_packets, 1, NULL );
1702 vlc_mutex_unlock( &p_input->p->counters.counters_lock );
1707 static block_t *AReadBlock( stream_t *s, bool *pb_eof )
1709 stream_sys_t *p_sys = s->p_sys;
1710 access_t *p_access = p_sys->p_access;
1711 input_thread_t *p_input = s->p_input;
1715 if( !p_sys->i_list )
1717 p_block = p_access->pf_block( p_access );
1718 if( pb_eof ) *pb_eof = p_access->info.b_eof;
1719 if( p_input && p_block && libvlc_stats (p_access) )
1723 vlc_mutex_lock( &p_input->p->counters.counters_lock );
1724 stats_Update( p_input->p->counters.p_read_bytes,
1725 p_block->i_buffer, &total );
1726 stats_Update( p_input->p->counters.p_input_bitrate,
1728 stats_Update( p_input->p->counters.p_read_packets, 1, NULL );
1729 vlc_mutex_unlock( &p_input->p->counters.counters_lock );
1734 p_block = p_sys->p_list_access->pf_block( p_sys->p_list_access );
1735 b_eof = p_sys->p_list_access->info.b_eof;
1736 if( pb_eof ) *pb_eof = b_eof;
1738 /* If we reached an EOF then switch to the next stream in the list */
1739 if( !p_block && b_eof && p_sys->i_list_index + 1 < p_sys->i_list )
1741 char *psz_name = p_sys->list[++p_sys->i_list_index]->psz_path;
1742 access_t *p_list_access;
1744 msg_Dbg( s, "opening input `%s'", psz_name );
1746 p_list_access = access_New( s, s->p_input, p_access->psz_access, "", psz_name );
1748 if( !p_list_access ) return 0;
1750 if( p_sys->p_list_access != p_access )
1751 access_Delete( p_sys->p_list_access );
1753 p_sys->p_list_access = p_list_access;
1755 /* We have to read some data */
1756 return AReadBlock( s, pb_eof );
1764 vlc_mutex_lock( &p_input->p->counters.counters_lock );
1765 stats_Update( p_input->p->counters.p_read_bytes,
1766 p_block->i_buffer, &total );
1767 stats_Update( p_input->p->counters.p_input_bitrate, total, NULL );
1768 stats_Update( p_input->p->counters.p_read_packets, 1 , NULL);
1769 vlc_mutex_unlock( &p_input->p->counters.counters_lock );
1775 static int ASeek( stream_t *s, uint64_t i_pos )
1777 stream_sys_t *p_sys = s->p_sys;
1778 access_t *p_access = p_sys->p_access;
1780 /* Check which stream we need to access */
1786 access_t *p_list_access = 0;
1788 for( i = 0; i < p_sys->i_list - 1; i++ )
1790 if( i_pos < p_sys->list[i]->i_size + i_size ) break;
1791 i_size += p_sys->list[i]->i_size;
1793 psz_name = p_sys->list[i]->psz_path;
1795 if( i != p_sys->i_list_index )
1796 msg_Dbg( s, "opening input `%s'", psz_name );
1798 if( i != p_sys->i_list_index && i != 0 )
1801 access_New( s, s->p_input, p_access->psz_access, "", psz_name );
1803 else if( i != p_sys->i_list_index )
1805 p_list_access = p_access;
1810 if( p_sys->p_list_access != p_access )
1811 access_Delete( p_sys->p_list_access );
1813 p_sys->p_list_access = p_list_access;
1816 p_sys->i_list_index = i;
1817 return p_sys->p_list_access->pf_seek( p_sys->p_list_access,
1821 return p_access->pf_seek( p_access, i_pos );
1826 * Try to read "i_read" bytes into a buffer pointed by "p_read". If
1827 * "p_read" is NULL then data are skipped instead of read.
1828 * \return The real number of bytes read/skip. If this value is less
1829 * than i_read that means that it's the end of the stream.
1830 * \note stream_Read increments the stream position, and when p_read is NULL,
1831 * this is its only task.
1833 int stream_Read( stream_t *s, void *p_read, int i_read )
1835 return s->pf_read( s, p_read, i_read );
1839 * Store in pp_peek a pointer to the next "i_peek" bytes in the stream
1840 * \return The real number of valid bytes. If it's less
1841 * or equal to 0, *pp_peek is invalid.
1842 * \note pp_peek is a pointer to internal buffer and it will be invalid as
1843 * soons as other stream_* functions are called.
1844 * \note Contrary to stream_Read, stream_Peek doesn't modify the stream
1845 * position, and doesn't necessarily involve copying of data. It's mainly
1846 * used by the modules to quickly probe the (head of the) stream.
1847 * \note Due to input limitation, the return value could be less than i_peek
1848 * without meaning the end of the stream (but only when you have i_peek >=
1849 * p_input->i_bufsize)
1851 int stream_Peek( stream_t *s, const uint8_t **pp_peek, int i_peek )
1853 return s->pf_peek( s, pp_peek, i_peek );
1857 * Use to control the "stream_t *". Look at #stream_query_e for
1858 * possible "i_query" value and format arguments. Return VLC_SUCCESS
1859 * if ... succeed ;) and VLC_EGENERIC if failed or unimplemented
1861 int stream_vaControl( stream_t *s, int i_query, va_list args )
1863 return s->pf_control( s, i_query, args );
1869 void stream_Delete( stream_t *s )
1874 int stream_Control( stream_t *s, int i_query, ... )
1880 return VLC_EGENERIC;
1882 va_start( args, i_query );
1883 i_result = s->pf_control( s, i_query, args );
1889 * Read "i_size" bytes and store them in a block_t.
1890 * It always read i_size bytes unless you are at the end of the stream
1891 * where it return what is available.
1893 block_t *stream_Block( stream_t *s, int i_size )
1895 if( i_size <= 0 ) return NULL;
1897 /* emulate block read */
1898 block_t *p_bk = block_Alloc( i_size );
1901 int i_read = stream_Read( s, p_bk->p_buffer, i_size );
1904 p_bk->i_buffer = i_read;
1907 block_Release( p_bk );
1913 * Read the remaining of the data if there is less than i_max_size bytes, otherwise
1916 * The stream position is unknown after the call.
1918 block_t *stream_BlockRemaining( stream_t *s, int i_max_size )
1920 int i_allocate = __MIN(1000000, i_max_size);
1921 int64_t i_size = stream_Size( s );
1924 int64_t i_position = stream_Tell( s );
1925 if( i_position + i_max_size < i_size )
1927 msg_Err( s, "Remaining stream size is greater than %d bytes",
1931 i_allocate = i_size - i_position;
1933 if( i_allocate <= 0 )
1936 block_t *p_block = block_Alloc( i_allocate );
1940 int i_read = stream_Read( s, &p_block->p_buffer[i_index],
1941 p_block->i_buffer - i_index);
1945 i_max_size -= i_read;
1946 if( i_max_size <= 0 )
1948 p_block = block_Realloc( p_block, 0, p_block->i_buffer +
1949 __MIN(1000000, i_max_size) );
1952 p_block->i_buffer = i_index;