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 );
572 case STREAM_CAN_FASTSEEK:
573 return access_vaControl( p_access, ACCESS_CAN_FASTSEEK, args );
575 case STREAM_GET_POSITION:
576 pi_64 = va_arg( args, uint64_t * );
577 *pi_64 = p_sys->i_pos;
580 case STREAM_SET_POSITION:
581 i_64 = va_arg( args, uint64_t );
582 switch( p_sys->method )
584 case STREAM_METHOD_BLOCK:
585 return AStreamSeekBlock( s, i_64 );
586 case STREAM_METHOD_STREAM:
587 return AStreamSeekStream( s, i_64 );
593 case STREAM_CONTROL_ACCESS:
595 i_int = (int) va_arg( args, int );
596 if( i_int != ACCESS_SET_PRIVATE_ID_STATE &&
597 i_int != ACCESS_SET_PRIVATE_ID_CA &&
598 i_int != ACCESS_GET_PRIVATE_ID_STATE &&
599 i_int != ACCESS_SET_TITLE &&
600 i_int != ACCESS_SET_SEEKPOINT )
602 msg_Err( s, "Hey, what are you thinking ?"
603 "DON'T USE STREAM_CONTROL_ACCESS !!!" );
606 int i_ret = access_vaControl( p_access, i_int, args );
607 if( i_int == ACCESS_SET_TITLE || i_int == ACCESS_SET_SEEKPOINT )
608 AStreamControlReset( s );
612 case STREAM_UPDATE_SIZE:
613 AStreamControlUpdate( s );
616 case STREAM_GET_CONTENT_TYPE:
617 return access_vaControl( p_access, ACCESS_GET_CONTENT_TYPE, args );
619 case STREAM_SET_PAUSE_STATE:
620 return access_vaControl( p_access, ACCESS_SET_PAUSE_STATE, args );
622 case STREAM_SET_RECORD_STATE:
624 msg_Err( s, "invalid stream_vaControl query=0x%x", i_query );
630 /****************************************************************************
632 ****************************************************************************/
633 static void AStreamPrebufferBlock( stream_t *s )
635 stream_sys_t *p_sys = s->p_sys;
640 msg_Dbg( s, "starting pre-buffering" );
644 const int64_t i_date = mdate();
648 if( !vlc_object_alive(s) || p_sys->block.i_size > STREAM_CACHE_PREBUFFER_SIZE )
653 p_sys->stat.i_bytes = p_sys->block.i_size;
654 p_sys->stat.i_read_time = i_date - i_start;
655 i_byterate = ( INT64_C(1000000) * p_sys->stat.i_bytes ) /
656 (p_sys->stat.i_read_time + 1);
658 msg_Dbg( s, "prebuffering done %"PRId64" bytes in %"PRId64"s - "
661 p_sys->stat.i_read_time / INT64_C(1000000),
667 if( ( b = AReadBlock( s, &b_eof ) ) == NULL )
676 /* Append the block */
677 p_sys->block.i_size += b->i_buffer;
678 *p_sys->block.pp_last = b;
679 p_sys->block.pp_last = &b->p_next;
681 p_sys->stat.i_read_count++;
688 msg_Dbg( s, "received first data after %d ms",
689 (int)((i_first-i_start)/1000) );
693 p_sys->block.p_current = p_sys->block.p_first;
696 static int AStreamRefillBlock( stream_t *s );
698 static int AStreamReadBlock( stream_t *s, void *p_read, unsigned int i_read )
700 stream_sys_t *p_sys = s->p_sys;
702 uint8_t *p_data = p_read;
703 unsigned int i_data = 0;
706 if( p_sys->block.p_current == NULL )
711 /* seek within this stream if possible, else use plain old read and discard */
712 stream_sys_t *p_sys = s->p_sys;
713 access_t *p_access = p_sys->p_access;
715 access_Control( p_access, ACCESS_CAN_SEEK, &b_aseek );
717 return AStreamSeekBlock( s, p_sys->i_pos + i_read ) ? 0 : i_read;
720 while( i_data < i_read )
723 p_sys->block.p_current->i_buffer - p_sys->block.i_offset;
724 unsigned int i_copy = VLC_CLIP( (unsigned int)i_current, 0, i_read - i_data);
730 &p_sys->block.p_current->p_buffer[p_sys->block.i_offset],
736 p_sys->block.i_offset += i_copy;
737 if( p_sys->block.i_offset >= p_sys->block.p_current->i_buffer )
739 /* Current block is now empty, switch to next */
740 if( p_sys->block.p_current )
742 p_sys->block.i_offset = 0;
743 p_sys->block.p_current = p_sys->block.p_current->p_next;
745 /*Get a new block if needed */
746 if( !p_sys->block.p_current && AStreamRefillBlock( s ) )
753 p_sys->i_pos += i_data;
757 static int AStreamPeekBlock( stream_t *s, const uint8_t **pp_peek, unsigned int i_read )
759 stream_sys_t *p_sys = s->p_sys;
761 unsigned int i_data = 0;
763 unsigned int i_offset;
765 if( p_sys->block.p_current == NULL ) return 0; /* EOF */
767 /* We can directly give a pointer over our buffer */
768 if( i_read <= p_sys->block.p_current->i_buffer - p_sys->block.i_offset )
770 *pp_peek = &p_sys->block.p_current->p_buffer[p_sys->block.i_offset];
774 /* We need to create a local copy */
775 if( p_sys->i_peek < i_read )
777 p_sys->p_peek = realloc_or_free( p_sys->p_peek, i_read );
783 p_sys->i_peek = i_read;
786 /* Fill enough data */
787 while( p_sys->block.i_size - (p_sys->i_pos - p_sys->block.i_start)
790 block_t **pp_last = p_sys->block.pp_last;
792 if( AStreamRefillBlock( s ) ) break;
794 /* Our buffer are probably filled enough, don't try anymore */
795 if( pp_last == p_sys->block.pp_last ) break;
798 /* Copy what we have */
799 b = p_sys->block.p_current;
800 i_offset = p_sys->block.i_offset;
801 p_data = p_sys->p_peek;
803 while( b && i_data < i_read )
805 unsigned int i_current = __MAX(b->i_buffer - i_offset,0);
806 int i_copy = __MIN( i_current, i_read - i_data );
808 memcpy( p_data, &b->p_buffer[i_offset], i_copy );
813 if( i_offset >= b->i_buffer )
820 *pp_peek = p_sys->p_peek;
824 static int AStreamSeekBlock( stream_t *s, uint64_t i_pos )
826 stream_sys_t *p_sys = s->p_sys;
827 access_t *p_access = p_sys->p_access;
828 int64_t i_offset = i_pos - p_sys->block.i_start;
831 /* We already have thoses data, just update p_current/i_offset */
832 if( i_offset >= 0 && (uint64_t)i_offset < p_sys->block.i_size )
834 block_t *b = p_sys->block.p_first;
837 while( i_current + b->i_buffer < (uint64_t)i_offset )
839 i_current += b->i_buffer;
843 p_sys->block.p_current = b;
844 p_sys->block.i_offset = i_offset - i_current;
846 p_sys->i_pos = i_pos;
851 /* We may need to seek or to read data */
855 access_Control( p_access, ACCESS_CAN_SEEK, &b_aseek );
859 msg_Err( s, "backward seeking impossible (access not seekable)" );
867 bool b_aseek, b_aseekfast;
869 access_Control( p_access, ACCESS_CAN_SEEK, &b_aseek );
870 access_Control( p_access, ACCESS_CAN_FASTSEEK, &b_aseekfast );
875 msg_Warn( s, "%"PRId64" bytes need to be skipped "
876 "(access non seekable)",
877 i_offset - p_sys->block.i_size );
881 int64_t i_skip = i_offset - p_sys->block.i_size;
883 /* Avg bytes per packets */
884 int i_avg = p_sys->stat.i_bytes / p_sys->stat.i_read_count;
885 /* TODO compute a seek cost instead of fixed threshold */
886 int i_th = b_aseekfast ? 1 : 5;
888 if( i_skip <= i_th * i_avg &&
889 i_skip < STREAM_CACHE_SIZE )
894 msg_Dbg( s, "b_seek=%d th*avg=%d skip=%"PRId64,
895 b_seek, i_th*i_avg, i_skip );
901 int64_t i_start, i_end;
902 /* Do the access seek */
904 if( ASeek( s, i_pos ) ) return VLC_EGENERIC;
908 block_ChainRelease( p_sys->block.p_first );
911 p_sys->block.i_start = p_sys->i_pos = i_pos;
912 p_sys->block.i_offset = 0;
913 p_sys->block.p_current = NULL;
914 p_sys->block.i_size = 0;
915 p_sys->block.p_first = NULL;
916 p_sys->block.pp_last = &p_sys->block.p_first;
919 if( AStreamRefillBlock( s ) )
923 p_sys->stat.i_seek_time += i_end - i_start;
924 p_sys->stat.i_seek_count++;
931 while( p_sys->block.p_current &&
932 p_sys->i_pos + p_sys->block.p_current->i_buffer - p_sys->block.i_offset <= i_pos )
934 p_sys->i_pos += p_sys->block.p_current->i_buffer - p_sys->block.i_offset;
935 p_sys->block.p_current = p_sys->block.p_current->p_next;
936 p_sys->block.i_offset = 0;
938 if( !p_sys->block.p_current && AStreamRefillBlock( s ) )
940 if( p_sys->i_pos != i_pos )
944 while( p_sys->block.i_start + p_sys->block.i_size < i_pos );
946 p_sys->block.i_offset += i_pos - p_sys->i_pos;
947 p_sys->i_pos = i_pos;
955 static int AStreamRefillBlock( stream_t *s )
957 stream_sys_t *p_sys = s->p_sys;
961 while( p_sys->block.i_size >= STREAM_CACHE_SIZE &&
962 p_sys->block.p_first != p_sys->block.p_current )
964 block_t *b = p_sys->block.p_first;
966 p_sys->block.i_start += b->i_buffer;
967 p_sys->block.i_size -= b->i_buffer;
968 p_sys->block.p_first = b->p_next;
972 if( p_sys->block.i_size >= STREAM_CACHE_SIZE &&
973 p_sys->block.p_current == p_sys->block.p_first &&
974 p_sys->block.p_current->p_next ) /* At least 2 packets */
976 /* Enough data, don't read more */
980 /* Now read a new block */
981 const int64_t i_start = mdate();
986 if( !vlc_object_alive(s) )
990 if( ( b = AReadBlock( s, &b_eof ) ) )
996 p_sys->stat.i_read_time += mdate() - i_start;
999 /* Append the block */
1000 p_sys->block.i_size += b->i_buffer;
1001 *p_sys->block.pp_last = b;
1002 p_sys->block.pp_last = &b->p_next;
1005 if( p_sys->block.p_current == NULL )
1006 p_sys->block.p_current = b;
1009 p_sys->stat.i_bytes += b->i_buffer;
1010 p_sys->stat.i_read_count++;
1018 /****************************************************************************
1020 ****************************************************************************/
1021 static int AStreamRefillStream( stream_t *s );
1022 static int AStreamReadNoSeekStream( stream_t *s, void *p_read, unsigned int i_read );
1024 static int AStreamReadStream( stream_t *s, void *p_read, unsigned int i_read )
1026 stream_sys_t *p_sys = s->p_sys;
1030 const uint64_t i_pos_wanted = p_sys->i_pos + i_read;
1032 if( AStreamSeekStream( s, i_pos_wanted ) )
1034 if( p_sys->i_pos != i_pos_wanted )
1039 return AStreamReadNoSeekStream( s, p_read, i_read );
1042 static int AStreamPeekStream( stream_t *s, const uint8_t **pp_peek, unsigned int i_read )
1044 stream_sys_t *p_sys = s->p_sys;
1045 stream_track_t *tk = &p_sys->stream.tk[p_sys->stream.i_tk];
1048 if( tk->i_start >= tk->i_end ) return 0; /* EOF */
1051 msg_Dbg( s, "AStreamPeekStream: %d pos=%"PRId64" tk=%d "
1052 "start=%"PRId64" offset=%d end=%"PRId64,
1053 i_read, p_sys->i_pos, p_sys->stream.i_tk,
1054 tk->i_start, p_sys->stream.i_offset, tk->i_end );
1057 /* Avoid problem, but that should *never* happen */
1058 if( i_read > STREAM_CACHE_TRACK_SIZE / 2 )
1059 i_read = STREAM_CACHE_TRACK_SIZE / 2;
1061 while( tk->i_end < tk->i_start + p_sys->stream.i_offset + i_read )
1063 if( p_sys->stream.i_used <= 1 )
1065 /* Be sure we will read something */
1066 p_sys->stream.i_used += tk->i_start + p_sys->stream.i_offset + i_read - tk->i_end;
1068 if( AStreamRefillStream( s ) ) break;
1071 if( tk->i_end < tk->i_start + p_sys->stream.i_offset + i_read )
1073 i_read = tk->i_end - tk->i_start - p_sys->stream.i_offset;
1077 /* Now, direct pointer or a copy ? */
1078 i_off = (tk->i_start + p_sys->stream.i_offset) % STREAM_CACHE_TRACK_SIZE;
1079 if( i_off + i_read <= STREAM_CACHE_TRACK_SIZE )
1081 *pp_peek = &tk->p_buffer[i_off];
1085 if( p_sys->i_peek < i_read )
1087 p_sys->p_peek = realloc_or_free( p_sys->p_peek, i_read );
1088 if( !p_sys->p_peek )
1093 p_sys->i_peek = i_read;
1096 memcpy( p_sys->p_peek, &tk->p_buffer[i_off],
1097 STREAM_CACHE_TRACK_SIZE - i_off );
1098 memcpy( &p_sys->p_peek[STREAM_CACHE_TRACK_SIZE - i_off],
1099 &tk->p_buffer[0], i_read - (STREAM_CACHE_TRACK_SIZE - i_off) );
1101 *pp_peek = p_sys->p_peek;
1105 static int AStreamSeekStream( stream_t *s, uint64_t i_pos )
1107 stream_sys_t *p_sys = s->p_sys;
1109 stream_track_t *p_current = &p_sys->stream.tk[p_sys->stream.i_tk];
1110 access_t *p_access = p_sys->p_access;
1112 if( p_current->i_start >= p_current->i_end && i_pos >= p_current->i_end )
1116 msg_Dbg( s, "AStreamSeekStream: to %"PRId64" pos=%"PRId64
1117 " tk=%d start=%"PRId64" offset=%d end=%"PRId64,
1118 i_pos, p_sys->i_pos, p_sys->stream.i_tk,
1120 p_sys->stream.i_offset,
1125 access_Control( p_access, ACCESS_CAN_SEEK, &b_aseek );
1126 if( !b_aseek && i_pos < p_current->i_start )
1128 msg_Warn( s, "AStreamSeekStream: can't seek" );
1129 return VLC_EGENERIC;
1133 access_Control( p_access, ACCESS_CAN_FASTSEEK, &b_afastseek );
1135 /* FIXME compute seek cost (instead of static 'stupid' value) */
1136 uint64_t i_skip_threshold;
1138 i_skip_threshold = b_afastseek ? 128 : 3*p_sys->stream.i_read_size;
1140 i_skip_threshold = INT64_MAX;
1142 /* Date the current track */
1143 p_current->i_date = mdate();
1145 /* Search a new track slot */
1146 stream_track_t *tk = NULL;
1149 /* Prefer the current track */
1150 if( p_current->i_start <= i_pos && i_pos <= p_current->i_end + i_skip_threshold )
1153 i_tk_idx = p_sys->stream.i_tk;
1157 /* Try to maximize already read data */
1158 for( int i = 0; i < STREAM_CACHE_TRACK; i++ )
1160 stream_track_t *t = &p_sys->stream.tk[i];
1162 if( t->i_start > i_pos || i_pos > t->i_end )
1165 if( !tk || tk->i_end < t->i_end )
1174 /* Use the oldest unused */
1175 for( int i = 0; i < STREAM_CACHE_TRACK; i++ )
1177 stream_track_t *t = &p_sys->stream.tk[i];
1179 if( !tk || tk->i_date > t->i_date )
1186 assert( i_tk_idx >= 0 && i_tk_idx < STREAM_CACHE_TRACK );
1188 if( tk != p_current )
1189 i_skip_threshold = 0;
1190 if( tk->i_start <= i_pos && i_pos <= tk->i_end + i_skip_threshold )
1193 msg_Err( s, "AStreamSeekStream: reusing %d start=%"PRId64
1194 " end=%"PRId64"(%s)",
1195 i_tk_idx, tk->i_start, tk->i_end,
1196 tk != p_current ? "seek" : i_pos > tk->i_end ? "skip" : "noseek" );
1198 if( tk != p_current )
1202 /* Seek at the end of the buffer
1203 * TODO it is stupid to seek now, it would be better to delay it
1205 if( ASeek( s, tk->i_end ) )
1206 return VLC_EGENERIC;
1208 else if( i_pos > tk->i_end )
1210 uint64_t i_skip = i_pos - tk->i_end;
1213 const int i_read_max = __MIN( 10 * STREAM_READ_ATONCE, i_skip );
1214 if( AStreamReadNoSeekStream( s, NULL, i_read_max ) != i_read_max )
1215 return VLC_EGENERIC;
1216 i_skip -= i_read_max;
1223 msg_Err( s, "AStreamSeekStream: hard seek" );
1225 /* Nothing good, seek and choose oldest segment */
1226 if( ASeek( s, i_pos ) )
1227 return VLC_EGENERIC;
1229 tk->i_start = i_pos;
1232 p_sys->stream.i_offset = i_pos - tk->i_start;
1233 p_sys->stream.i_tk = i_tk_idx;
1234 p_sys->i_pos = i_pos;
1236 /* If there is not enough data left in the track, refill */
1237 /* TODO How to get a correct value for
1238 * - refilling threshold
1239 * - how much to refill
1241 if( tk->i_end < tk->i_start + p_sys->stream.i_offset + p_sys->stream.i_read_size )
1243 if( p_sys->stream.i_used < STREAM_READ_ATONCE / 2 )
1244 p_sys->stream.i_used = STREAM_READ_ATONCE / 2;
1246 if( AStreamRefillStream( s ) && i_pos >= tk->i_end )
1247 return VLC_EGENERIC;
1252 static int AStreamReadNoSeekStream( stream_t *s, void *p_read, unsigned int i_read )
1254 stream_sys_t *p_sys = s->p_sys;
1255 stream_track_t *tk = &p_sys->stream.tk[p_sys->stream.i_tk];
1257 uint8_t *p_data = (uint8_t *)p_read;
1258 unsigned int i_data = 0;
1260 if( tk->i_start >= tk->i_end )
1264 msg_Dbg( s, "AStreamReadStream: %d pos=%"PRId64" tk=%d start=%"PRId64
1265 " offset=%d end=%"PRId64,
1266 i_read, p_sys->i_pos, p_sys->stream.i_tk,
1267 tk->i_start, p_sys->stream.i_offset, tk->i_end );
1270 while( i_data < i_read )
1272 unsigned i_off = (tk->i_start + p_sys->stream.i_offset) % STREAM_CACHE_TRACK_SIZE;
1273 unsigned int i_current =
1274 __MIN( tk->i_end - tk->i_start - p_sys->stream.i_offset,
1275 STREAM_CACHE_TRACK_SIZE - i_off );
1276 int i_copy = __MIN( i_current, i_read - i_data );
1278 if( i_copy <= 0 ) break; /* EOF */
1281 /* msg_Dbg( s, "AStreamReadStream: copy %d", i_copy ); */
1284 memcpy( p_data, &tk->p_buffer[i_off], i_copy );
1288 p_sys->stream.i_offset += i_copy;
1290 /* Update pos now */
1291 p_sys->i_pos += i_copy;
1294 p_sys->stream.i_used += i_copy;
1296 if( tk->i_end + i_data <= tk->i_start + p_sys->stream.i_offset + i_read )
1298 const unsigned i_read_requested = VLC_CLIP( i_read - i_data,
1299 STREAM_READ_ATONCE / 2,
1300 STREAM_READ_ATONCE * 10 );
1302 if( p_sys->stream.i_used < i_read_requested )
1303 p_sys->stream.i_used = i_read_requested;
1305 if( AStreamRefillStream( s ) )
1308 if( tk->i_start >= tk->i_end ) break;
1317 static int AStreamRefillStream( stream_t *s )
1319 stream_sys_t *p_sys = s->p_sys;
1320 stream_track_t *tk = &p_sys->stream.tk[p_sys->stream.i_tk];
1322 /* We read but won't increase i_start after initial start + offset */
1324 __MIN( p_sys->stream.i_used, STREAM_CACHE_TRACK_SIZE -
1325 (tk->i_end - tk->i_start - p_sys->stream.i_offset) );
1326 bool b_read = false;
1327 int64_t i_start, i_stop;
1329 if( i_toread <= 0 ) return VLC_EGENERIC; /* EOF */
1332 msg_Dbg( s, "AStreamRefillStream: used=%d toread=%d",
1333 p_sys->stream.i_used, i_toread );
1337 while( i_toread > 0 )
1339 int i_off = tk->i_end % STREAM_CACHE_TRACK_SIZE;
1342 if( !vlc_object_alive(s) )
1343 return VLC_EGENERIC;
1345 i_read = __MIN( i_toread, STREAM_CACHE_TRACK_SIZE - i_off );
1346 i_read = AReadStream( s, &tk->p_buffer[i_off], i_read );
1348 /* msg_Dbg( s, "AStreamRefillStream: read=%d", i_read ); */
1353 else if( i_read == 0 )
1356 return VLC_EGENERIC;
1362 tk->i_end += i_read;
1364 /* Windows of STREAM_CACHE_TRACK_SIZE */
1365 if( tk->i_start + STREAM_CACHE_TRACK_SIZE < tk->i_end )
1367 unsigned i_invalid = tk->i_end - tk->i_start - STREAM_CACHE_TRACK_SIZE;
1369 tk->i_start += i_invalid;
1370 p_sys->stream.i_offset -= i_invalid;
1374 p_sys->stream.i_used -= i_read;
1376 p_sys->stat.i_bytes += i_read;
1377 p_sys->stat.i_read_count++;
1381 p_sys->stat.i_read_time += i_stop - i_start;
1386 static void AStreamPrebufferStream( stream_t *s )
1388 stream_sys_t *p_sys = s->p_sys;
1390 int64_t i_first = 0;
1393 msg_Dbg( s, "starting pre-buffering" );
1397 stream_track_t *tk = &p_sys->stream.tk[p_sys->stream.i_tk];
1399 int64_t i_date = mdate();
1401 int i_buffered = tk->i_end - tk->i_start;
1403 if( !vlc_object_alive(s) || i_buffered >= STREAM_CACHE_PREBUFFER_SIZE )
1408 p_sys->stat.i_bytes = i_buffered;
1409 p_sys->stat.i_read_time = i_date - i_start;
1410 i_byterate = ( INT64_C(1000000) * p_sys->stat.i_bytes ) /
1411 (p_sys->stat.i_read_time+1);
1413 msg_Dbg( s, "pre-buffering done %"PRId64" bytes in %"PRId64"s - "
1415 p_sys->stat.i_bytes,
1416 p_sys->stat.i_read_time / INT64_C(1000000),
1417 i_byterate / 1024 );
1422 i_read = STREAM_CACHE_TRACK_SIZE - i_buffered;
1423 i_read = __MIN( (int)p_sys->stream.i_read_size, i_read );
1424 i_read = AReadStream( s, &tk->p_buffer[i_buffered], i_read );
1427 else if( i_read == 0 )
1433 msg_Dbg( s, "received first data after %d ms",
1434 (int)((i_first-i_start)/1000) );
1437 tk->i_end += i_read;
1439 p_sys->stat.i_read_count++;
1443 /****************************************************************************
1445 ****************************************************************************/
1447 * Read from the stream untill first newline.
1448 * \param s Stream handle to read from
1449 * \return A pointer to the allocated output string. You need to free this when you are done.
1451 #define STREAM_PROBE_LINE 2048
1452 #define STREAM_LINE_MAX (2048*100)
1453 char *stream_ReadLine( stream_t *s )
1455 char *p_line = NULL;
1456 int i_line = 0, i_read = 0;
1458 while( i_read < STREAM_LINE_MAX )
1461 const uint8_t *p_data;
1465 /* Probe new data */
1466 i_data = stream_Peek( s, &p_data, STREAM_PROBE_LINE );
1467 if( i_data <= 0 ) break; /* No more data */
1470 i_pos = stream_Tell( s );
1471 if( i_pos == 0 && i_data >= 2 )
1473 const char *psz_encoding = NULL;
1475 if( !memcmp( p_data, "\xFF\xFE", 2 ) )
1477 psz_encoding = "UTF-16LE";
1478 s->p_text->b_little_endian = true;
1480 else if( !memcmp( p_data, "\xFE\xFF", 2 ) )
1482 psz_encoding = "UTF-16BE";
1485 /* Open the converter if we need it */
1486 if( psz_encoding != NULL )
1488 msg_Dbg( s, "UTF-16 BOM detected" );
1489 s->p_text->i_char_width = 2;
1490 s->p_text->conv = vlc_iconv_open( "UTF-8", psz_encoding );
1491 if( s->p_text->conv == (vlc_iconv_t)-1 )
1492 msg_Err( s, "iconv_open failed" );
1496 if( i_data % s->p_text->i_char_width )
1498 /* keep i_char_width boundary */
1499 i_data = i_data - ( i_data % s->p_text->i_char_width );
1500 msg_Warn( s, "the read is not i_char_width compatible");
1506 /* Check if there is an EOL */
1507 if( s->p_text->i_char_width == 1 )
1509 /* UTF-8: 0A <LF> */
1510 psz_eol = memchr( p_data, '\n', i_data );
1511 if( psz_eol == NULL )
1512 /* UTF-8: 0D <CR> */
1513 psz_eol = memchr( p_data, '\r', i_data );
1517 const uint8_t *p_last = p_data + i_data - s->p_text->i_char_width;
1518 uint16_t eol = s->p_text->b_little_endian ? 0x0A00 : 0x00A0;
1520 assert( s->p_text->i_char_width == 2 );
1522 /* UTF-16: 000A <LF> */
1523 for( const uint8_t *p = p_data; p <= p_last; p += 2 )
1525 if( U16_AT( p ) == eol )
1527 psz_eol = (char *)p + 1;
1532 if( psz_eol == NULL )
1533 { /* UTF-16: 000D <CR> */
1534 eol = s->p_text->b_little_endian ? 0x0D00 : 0x00D0;
1535 for( const uint8_t *p = p_data; p <= p_last; p += 2 )
1537 if( U16_AT( p ) == eol )
1539 psz_eol = (char *)p + 1;
1548 i_data = (psz_eol - (char *)p_data) + 1;
1549 p_line = realloc_or_free( p_line,
1550 i_line + i_data + s->p_text->i_char_width ); /* add \0 */
1553 i_data = stream_Read( s, &p_line[i_line], i_data );
1554 if( i_data <= 0 ) break; /* Hmmm */
1555 i_line += i_data - s->p_text->i_char_width; /* skip \n */;
1558 /* We have our line */
1562 /* Read data (+1 for easy \0 append) */
1563 p_line = realloc_or_free( p_line,
1564 i_line + STREAM_PROBE_LINE + s->p_text->i_char_width );
1567 i_data = stream_Read( s, &p_line[i_line], STREAM_PROBE_LINE );
1568 if( i_data <= 0 ) break; /* Hmmm */
1576 for( j = 0; j < s->p_text->i_char_width; j++ )
1578 p_line[i_line + j] = '\0';
1580 i_line += s->p_text->i_char_width; /* the added \0 */
1581 if( s->p_text->i_char_width > 1 )
1584 size_t i_in = 0, i_out = 0;
1585 const char * p_in = NULL;
1586 char * p_out = NULL;
1587 char * psz_new_line = NULL;
1590 /* UTF-8 needs at most 150% of the buffer as many as UTF-16 */
1591 i_new_line = i_line * 3 / 2;
1592 psz_new_line = malloc( i_new_line );
1593 if( psz_new_line == NULL )
1595 i_in = (size_t)i_line;
1596 i_out = (size_t)i_new_line;
1598 p_out = psz_new_line;
1600 if( vlc_iconv( s->p_text->conv, &p_in, &i_in, &p_out, &i_out ) == (size_t)-1 )
1602 msg_Err( s, "iconv failed" );
1603 msg_Dbg( s, "original: %d, in %d, out %d", i_line, (int)i_in, (int)i_out );
1606 p_line = psz_new_line;
1607 i_line = (size_t)i_new_line - i_out; /* does not include \0 */
1610 /* Remove trailing LF/CR */
1611 while( i_line >= 2 && ( p_line[i_line-2] == '\r' ||
1612 p_line[i_line-2] == '\n') ) i_line--;
1614 /* Make sure the \0 is there */
1615 p_line[i_line-1] = '\0';
1621 /* We failed to read any data, probably EOF */
1625 if( s->p_text->conv != (vlc_iconv_t)(-1) )
1626 vlc_iconv_close( s->p_text->conv );
1627 s->p_text->conv = (vlc_iconv_t)(-1);
1631 /****************************************************************************
1632 * Access reading/seeking wrappers to handle concatenated streams.
1633 ****************************************************************************/
1634 static int AReadStream( stream_t *s, void *p_read, unsigned int i_read )
1636 stream_sys_t *p_sys = s->p_sys;
1637 access_t *p_access = p_sys->p_access;
1638 input_thread_t *p_input = s->p_input;
1639 int i_read_orig = i_read;
1641 if( !p_sys->i_list )
1643 i_read = p_access->pf_read( p_access, p_read, i_read );
1648 vlc_mutex_lock( &p_input->p->counters.counters_lock );
1649 stats_Update( p_input->p->counters.p_read_bytes, i_read, &total );
1650 stats_Update( p_input->p->counters.p_input_bitrate, total, NULL );
1651 stats_Update( p_input->p->counters.p_read_packets, 1, NULL );
1652 vlc_mutex_unlock( &p_input->p->counters.counters_lock );
1657 i_read = p_sys->p_list_access->pf_read( p_sys->p_list_access, p_read,
1660 /* If we reached an EOF then switch to the next stream in the list */
1661 if( i_read == 0 && p_sys->i_list_index + 1 < p_sys->i_list )
1663 char *psz_name = p_sys->list[++p_sys->i_list_index]->psz_path;
1664 access_t *p_list_access;
1666 msg_Dbg( s, "opening input `%s'", psz_name );
1668 p_list_access = access_New( s, s->p_input, p_access->psz_access, "", psz_name );
1670 if( !p_list_access ) return 0;
1672 if( p_sys->p_list_access != p_access )
1673 access_Delete( p_sys->p_list_access );
1675 p_sys->p_list_access = p_list_access;
1677 /* We have to read some data */
1678 return AReadStream( s, p_read, i_read_orig );
1681 /* Update read bytes in input */
1686 vlc_mutex_lock( &p_input->p->counters.counters_lock );
1687 stats_Update( p_input->p->counters.p_read_bytes, i_read, &total );
1688 stats_Update( p_input->p->counters.p_input_bitrate, total, NULL );
1689 stats_Update( p_input->p->counters.p_read_packets, 1, NULL );
1690 vlc_mutex_unlock( &p_input->p->counters.counters_lock );
1695 static block_t *AReadBlock( stream_t *s, bool *pb_eof )
1697 stream_sys_t *p_sys = s->p_sys;
1698 access_t *p_access = p_sys->p_access;
1699 input_thread_t *p_input = s->p_input;
1703 if( !p_sys->i_list )
1705 p_block = p_access->pf_block( p_access );
1706 if( pb_eof ) *pb_eof = p_access->info.b_eof;
1707 if( p_input && p_block && libvlc_stats (p_access) )
1711 vlc_mutex_lock( &p_input->p->counters.counters_lock );
1712 stats_Update( p_input->p->counters.p_read_bytes,
1713 p_block->i_buffer, &total );
1714 stats_Update( p_input->p->counters.p_input_bitrate,
1716 stats_Update( p_input->p->counters.p_read_packets, 1, NULL );
1717 vlc_mutex_unlock( &p_input->p->counters.counters_lock );
1722 p_block = p_sys->p_list_access->pf_block( p_sys->p_list_access );
1723 b_eof = p_sys->p_list_access->info.b_eof;
1724 if( pb_eof ) *pb_eof = b_eof;
1726 /* If we reached an EOF then switch to the next stream in the list */
1727 if( !p_block && b_eof && p_sys->i_list_index + 1 < p_sys->i_list )
1729 char *psz_name = p_sys->list[++p_sys->i_list_index]->psz_path;
1730 access_t *p_list_access;
1732 msg_Dbg( s, "opening input `%s'", psz_name );
1734 p_list_access = access_New( s, s->p_input, p_access->psz_access, "", psz_name );
1736 if( !p_list_access ) return 0;
1738 if( p_sys->p_list_access != p_access )
1739 access_Delete( p_sys->p_list_access );
1741 p_sys->p_list_access = p_list_access;
1743 /* We have to read some data */
1744 return AReadBlock( s, pb_eof );
1752 vlc_mutex_lock( &p_input->p->counters.counters_lock );
1753 stats_Update( p_input->p->counters.p_read_bytes,
1754 p_block->i_buffer, &total );
1755 stats_Update( p_input->p->counters.p_input_bitrate, total, NULL );
1756 stats_Update( p_input->p->counters.p_read_packets, 1 , NULL);
1757 vlc_mutex_unlock( &p_input->p->counters.counters_lock );
1763 static int ASeek( stream_t *s, uint64_t i_pos )
1765 stream_sys_t *p_sys = s->p_sys;
1766 access_t *p_access = p_sys->p_access;
1768 /* Check which stream we need to access */
1774 access_t *p_list_access = 0;
1776 for( i = 0; i < p_sys->i_list - 1; i++ )
1778 if( i_pos < p_sys->list[i]->i_size + i_size ) break;
1779 i_size += p_sys->list[i]->i_size;
1781 psz_name = p_sys->list[i]->psz_path;
1783 if( i != p_sys->i_list_index )
1784 msg_Dbg( s, "opening input `%s'", psz_name );
1786 if( i != p_sys->i_list_index && i != 0 )
1789 access_New( s, s->p_input, p_access->psz_access, "", psz_name );
1791 else if( i != p_sys->i_list_index )
1793 p_list_access = p_access;
1798 if( p_sys->p_list_access != p_access )
1799 access_Delete( p_sys->p_list_access );
1801 p_sys->p_list_access = p_list_access;
1804 p_sys->i_list_index = i;
1805 return p_sys->p_list_access->pf_seek( p_sys->p_list_access,
1809 return p_access->pf_seek( p_access, i_pos );
1814 * Try to read "i_read" bytes into a buffer pointed by "p_read". If
1815 * "p_read" is NULL then data are skipped instead of read.
1816 * \return The real number of bytes read/skip. If this value is less
1817 * than i_read that means that it's the end of the stream.
1818 * \note stream_Read increments the stream position, and when p_read is NULL,
1819 * this is its only task.
1821 int stream_Read( stream_t *s, void *p_read, int i_read )
1823 return s->pf_read( s, p_read, i_read );
1827 * Store in pp_peek a pointer to the next "i_peek" bytes in the stream
1828 * \return The real number of valid bytes. If it's less
1829 * or equal to 0, *pp_peek is invalid.
1830 * \note pp_peek is a pointer to internal buffer and it will be invalid as
1831 * soons as other stream_* functions are called.
1832 * \note Contrary to stream_Read, stream_Peek doesn't modify the stream
1833 * position, and doesn't necessarily involve copying of data. It's mainly
1834 * used by the modules to quickly probe the (head of the) stream.
1835 * \note Due to input limitation, the return value could be less than i_peek
1836 * without meaning the end of the stream (but only when you have i_peek >=
1837 * p_input->i_bufsize)
1839 int stream_Peek( stream_t *s, const uint8_t **pp_peek, int i_peek )
1841 return s->pf_peek( s, pp_peek, i_peek );
1845 * Use to control the "stream_t *". Look at #stream_query_e for
1846 * possible "i_query" value and format arguments. Return VLC_SUCCESS
1847 * if ... succeed ;) and VLC_EGENERIC if failed or unimplemented
1849 int stream_vaControl( stream_t *s, int i_query, va_list args )
1851 return s->pf_control( s, i_query, args );
1857 void stream_Delete( stream_t *s )
1862 int stream_Control( stream_t *s, int i_query, ... )
1868 return VLC_EGENERIC;
1870 va_start( args, i_query );
1871 i_result = s->pf_control( s, i_query, args );
1877 * Read "i_size" bytes and store them in a block_t.
1878 * It always read i_size bytes unless you are at the end of the stream
1879 * where it return what is available.
1881 block_t *stream_Block( stream_t *s, int i_size )
1883 if( i_size <= 0 ) return NULL;
1885 /* emulate block read */
1886 block_t *p_bk = block_Alloc( i_size );
1889 int i_read = stream_Read( s, p_bk->p_buffer, i_size );
1892 p_bk->i_buffer = i_read;
1895 block_Release( p_bk );
1901 * Read the remaining of the data if there is less than i_max_size bytes, otherwise
1904 * The stream position is unknown after the call.
1906 block_t *stream_BlockRemaining( stream_t *s, int i_max_size )
1908 int i_allocate = __MIN(1000000, i_max_size);
1909 int64_t i_size = stream_Size( s );
1912 int64_t i_position = stream_Tell( s );
1913 if( i_position + i_max_size < i_size )
1915 msg_Err( s, "Remaining stream size is greater than %d bytes",
1919 i_allocate = i_size - i_position;
1921 if( i_allocate <= 0 )
1924 block_t *p_block = block_Alloc( i_allocate );
1928 int i_read = stream_Read( s, &p_block->p_buffer[i_index],
1929 p_block->i_buffer - i_index);
1933 i_max_size -= i_read;
1934 if( i_max_size <= 0 )
1936 p_block = block_Realloc( p_block, 0, p_block->i_buffer +
1937 __MIN(1000000, i_max_size) );
1940 p_block->i_buffer = i_index;