stream.c 32.4 KB
Newer Older
1 2 3
/*****************************************************************************
 * stream.c
 *****************************************************************************
4
 * Copyright (C) 1999-2004 VideoLAN
Gildas Bazin's avatar
Gildas Bazin committed
5
 * $Id$
6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27
 *
 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
 *****************************************************************************/

#include <stdlib.h>
#include <vlc/vlc.h>
#include <vlc/input.h>

28
#include "input_internal.h"
29

30 31 32 33 34
/* TODO:
 *  - tune the 2 methods
 *  - compute cost for seek
 *  - improve stream mode seeking with closest segments
 *  - ...
35
 */
36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76

/* Two methods:
 *  - using pf_block
 *      One linked list of data read
 *  - using pf_read
 *      More complex scheme using mutliple track to avoid seeking
 */

/* How many track we have, currently only used for stream mode */
#define STREAM_CACHE_TRACK 3
/* Max size of our cache 4Mo per track */
#define STREAM_CACHE_SIZE  (4*STREAM_CACHE_TRACK*1024*1024)
  /* How many data we try to prebuffer */
#define STREAM_CACHE_PREBUFFER_SIZE (32767)

#define STREAM_CACHE_PREBUFFER_LENGTH (100*1000)    /* Maximum time we take to pre-buffer */


/* Method1: Simple, for pf_block.
 *  We get blocks and put them in the linked list.
 *  We release blocks once the total size is bigger than CACHE_BLOCK_SIZE
 */
#define STREAM_DATA_WAIT 40000                     /* Time between before a pf_block retry */

/* Method2: A bit more complex, for pf_read
 *  - We use ring buffers, only one if unseekable, all if seekable
 *  - Upon seek date current ring, then search if one ring match the pos,
 *      yes: switch to it, seek the access to match the end of the ring
 *      no: search the ring with i_end the closer to i_pos,
 *          if close enough, read data and use this ring
 *          else use the oldest ring, seek and use it.
 *
 *  TODO: - with access non seekable: use all space available for only one ring, but
 *          we have to support seekable/non-seekable switch on the fly.
 *        - compute a good value for i_read_size
 *        - ?
 */
#define STREAM_READ_ATONCE 32767
#define STREAM_CACHE_TRACK_SIZE (STREAM_CACHE_SIZE/STREAM_CACHE_TRACK)

typedef struct
77
{
78
    int64_t i_date;
Derk-Jan Hartman's avatar
Derk-Jan Hartman committed
79

80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95
    int64_t i_start;
    int64_t i_end;

    uint8_t *p_buffer;
} stream_track_t;

struct stream_sys_t
{
    access_t    *p_access;

    vlc_bool_t  b_block;    /* Block method (1) or stream */

    int64_t     i_pos;      /* Current reading offset */

    /* Method 1: pf_block */
    struct
96
    {
97 98 99 100 101 102 103 104 105 106 107
        int64_t i_start;        /* Offset of block for p_first */
        int     i_offset;       /* Offset for data in p_current */
        block_t *p_current;     /* Current block */

        int     i_size;         /* Total amount of data in the list */
        block_t *p_first;
        block_t **pp_last;
    } block;

    /* Method 2: for pf_read */
    struct
108
    {
109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126
        int i_offset;   /* Buffer ofset in the current track */
        int i_tk;       /* Current track */
        stream_track_t tk[STREAM_CACHE_TRACK];

        /* Global buffer */
        uint8_t *p_buffer;

        /* */
        int i_used; /* Used since last read */
        int i_read_size;
    } stream;

    /* Peek temporary buffer */
    int     i_peek;
    uint8_t *p_peek;

    /* Stat for both method */
    struct
127
    {
128
        vlc_bool_t b_fastseek;  /* From access */
Derk-Jan Hartman's avatar
Derk-Jan Hartman committed
129

130 131 132 133
        /* Stat about reading data */
        int64_t i_read_count;
        int64_t i_bytes;
        int64_t i_read_time;
134

135 136 137 138 139
        /* Stat about seek */
        int     i_seek_count;
        int64_t i_seek_time;
    } stat;
};
140

141 142 143 144 145
/* Method 1: */
static int  AStreamReadBlock( stream_t *, void *p_read, int i_read );
static int  AStreamPeekBlock( stream_t *, uint8_t **p_peek, int i_read );
static int  AStreamSeekBlock( stream_t *s, int64_t i_pos );
static void AStreamPrebufferBlock( stream_t * );
146

147 148 149 150 151
/* Method 2 */
static int  AStreamReadStream( stream_t *, void *p_read, int i_read );
static int  AStreamPeekStream( stream_t *, uint8_t **pp_peek, int i_read );
static int  AStreamSeekStream( stream_t *s, int64_t i_pos );
static void AStreamPrebufferStream( stream_t * );
152

153 154
/* Common */
static int AStreamControl( stream_t *, int i_query, va_list );
155

156

157
/****************************************************************************
158
 * stream_AccessNew: create a stream from a access
159
 ****************************************************************************/
160
stream_t *stream_AccessNew( access_t *p_access )
161
{
162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217
    stream_t *s = vlc_object_create( p_access, VLC_OBJECT_STREAM );
    stream_sys_t *p_sys;

    if( !s )
        return NULL;

    /* Attach it now, needed for b_die */
    vlc_object_attach( s, p_access );

    s->pf_block  = NULL;
    s->pf_read   = NULL;    /* Set up later */
    s->pf_peek   = NULL;
    s->pf_control= AStreamControl;

    s->p_sys = p_sys = malloc( sizeof( stream_sys_t ) );

    /* Common field */
    p_sys->p_access = p_access;
    p_sys->b_block = p_access->pf_block ? VLC_TRUE : VLC_FALSE;
    p_sys->i_pos = p_access->info.i_pos;

    /* Stats */
    access2_Control( p_access, ACCESS_CAN_FASTSEEK, &p_sys->stat.b_fastseek );
    p_sys->stat.i_bytes = 0;
    p_sys->stat.i_read_time = 0;
    p_sys->stat.i_read_count = 0;
    p_sys->stat.i_seek_count = 0;
    p_sys->stat.i_seek_time = 0;

    /* Peek */
    p_sys->i_peek = 0;
    p_sys->p_peek = NULL;

    if( p_sys->b_block )
    {
        s->pf_read = AStreamReadBlock;
        s->pf_peek = AStreamPeekBlock;

        /* Init all fields of p_sys->block */
        p_sys->block.i_start = p_sys->i_pos;
        p_sys->block.i_offset = 0;
        p_sys->block.p_current = NULL;
        p_sys->block.i_size = 0;
        p_sys->block.p_first = NULL;
        p_sys->block.pp_last = &p_sys->block.p_first;

        /* Do the prebuffering */
        AStreamPrebufferBlock( s );

        if( p_sys->block.i_size <= 0 )
        {
            msg_Err( s, "cannot pre fill buffer" );
            goto error;
        }
    }
    else
218
    {
219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245
        int i;

        s->pf_read = AStreamReadStream;
        s->pf_peek = AStreamPeekStream;

        /* Allocate/Setup our tracks */
        p_sys->stream.i_offset = 0;
        p_sys->stream.i_tk     = 0;
        p_sys->stream.p_buffer = malloc( STREAM_CACHE_SIZE );
        p_sys->stream.i_used   = 0;
        access2_Control( p_access, ACCESS_GET_MTU, &p_sys->stream.i_read_size );
        if( p_sys->stream.i_read_size <= 0 )
            p_sys->stream.i_read_size = STREAM_READ_ATONCE;
        else if( p_sys->stream.i_read_size <= 256 )
            p_sys->stream.i_read_size = 256;

        for( i = 0; i < STREAM_CACHE_TRACK; i++ )
        {
            p_sys->stream.tk[i].i_date  = 0;
            p_sys->stream.tk[i].i_start = p_sys->i_pos;
            p_sys->stream.tk[i].i_end   = p_sys->i_pos;
            p_sys->stream.tk[i].p_buffer=
                &p_sys->stream.p_buffer[i * STREAM_CACHE_TRACK_SIZE];
        }

        /* Do the prebuffering */
        AStreamPrebufferStream( s );
246

247 248 249 250 251
        if( p_sys->stream.tk[p_sys->stream.i_tk].i_end <= 0 )
        {
            msg_Err( s, "cannot pre fill buffer" );
            goto error;
        }
252
    }
253 254


255
    return s;
256 257 258 259 260 261 262 263 264 265 266 267 268 269

error:
    if( p_sys->b_block )
    {
        /* Nothing yet */
    }
    else
    {
        free( p_sys->stream.p_buffer );
    }
    free( s->p_sys );
    vlc_object_detach( s );
    vlc_object_destroy( s );
    return NULL;
270 271
}

272
/****************************************************************************
273
 * stream_AccessDelete:
274
 ****************************************************************************/
275
void stream_AccessDelete( stream_t *s )
276
{
277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292
    stream_sys_t *p_sys = s->p_sys;

    vlc_object_detach( s );

    if( p_sys->b_block )
    {
        block_ChainRelease( p_sys->block.p_first );
    }
    else
    {
        free( p_sys->stream.p_buffer );
    }

    if( p_sys->p_peek )
        free( p_sys->p_peek );

293
    free( s->p_sys );
294 295 296
    vlc_object_destroy( s );
}

297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340
/****************************************************************************
 * stream_AccessReset:
 ****************************************************************************/
void stream_AccessReset( stream_t *s )
{
    stream_sys_t *p_sys = s->p_sys;

    p_sys->i_pos = p_sys->p_access->info.i_pos;

    if( p_sys->b_block )
    {
        block_ChainRelease( p_sys->block.p_first );

        /* Init all fields of p_sys->block */
        p_sys->block.i_start = p_sys->i_pos;
        p_sys->block.i_offset = 0;
        p_sys->block.p_current = NULL;
        p_sys->block.i_size = 0;
        p_sys->block.p_first = NULL;
        p_sys->block.pp_last = &p_sys->block.p_first;

        /* Do the prebuffering */
        AStreamPrebufferBlock( s );
    }
    else
    {
        int i;

        /* Setup our tracks */
        p_sys->stream.i_offset = 0;
        p_sys->stream.i_tk     = 0;
        p_sys->stream.i_used   = 0;

        for( i = 0; i < STREAM_CACHE_TRACK; i++ )
        {
            p_sys->stream.tk[i].i_date  = 0;
            p_sys->stream.tk[i].i_start = p_sys->i_pos;
            p_sys->stream.tk[i].i_end   = p_sys->i_pos;
        }

        /* Do the prebuffering */
        AStreamPrebufferStream( s );
    }
}
341 342

/****************************************************************************
343
 * AStreamControl:
344
 ****************************************************************************/
345
static int AStreamControl( stream_t *s, int i_query, va_list args )
346
{
347 348
    stream_sys_t *p_sys = s->p_sys;
    access_t     *p_access = p_sys->p_access;
349

350 351 352
    vlc_bool_t *p_bool;
    int64_t    *pi_64, i_64;
    int        i_int;
353 354 355 356

    switch( i_query )
    {
        case STREAM_GET_SIZE:
357 358 359
            pi_64 = (int64_t*)va_arg( args, int64_t * );
            *pi_64 = p_access->info.i_size;
            break;
360 361

        case STREAM_CAN_SEEK:
362 363 364
            p_bool = (vlc_bool_t*)va_arg( args, vlc_bool_t * );
            access2_Control( p_access, ACCESS_CAN_SEEK, p_bool );
            break;
365 366

        case STREAM_CAN_FASTSEEK:
367 368 369
            p_bool = (vlc_bool_t*)va_arg( args, vlc_bool_t * );
            access2_Control( p_access, ACCESS_CAN_FASTSEEK, p_bool );
            break;
370 371

        case STREAM_GET_POSITION:
372 373 374
            pi_64 = (int64_t*)va_arg( args, int64_t * );
            *pi_64 = p_sys->i_pos;
            break;
375 376

        case STREAM_SET_POSITION:
377 378 379 380 381
            i_64 = (int64_t)va_arg( args, int64_t );
            if( p_sys->b_block )
                return AStreamSeekBlock( s, i_64 );
            else
                return AStreamSeekStream( s, i_64 );
382

383
        case STREAM_GET_MTU:
384
            return VLC_EGENERIC;
385

386
        case STREAM_CONTROL_ACCESS:
387
            i_int = (int) va_arg( args, int );
388 389 390 391 392 393
            if( i_int != ACCESS_SET_PRIVATE_ID_STATE )
            {
                msg_Err( s, "Hey, what are you thinking ?"
                            "DON'T USE STREAM_CONTROL_ACCESS !!!" );
                return VLC_EGENERIC;
            }
394
            return access2_Control( p_access, i_int, args );
395

396 397 398 399
        default:
            msg_Err( s, "invalid stream_vaControl query=0x%x", i_query );
            return VLC_EGENERIC;
    }
400
    return VLC_SUCCESS;
401 402
}

403 404


405
/****************************************************************************
406
 * Method 1:
407
 ****************************************************************************/
408
static void AStreamPrebufferBlock( stream_t *s )
409
{
410 411
    stream_sys_t *p_sys = s->p_sys;
    access_t     *p_access = p_sys->p_access;
412

413 414
    int64_t i_first = 0;
    int64_t i_start;
415

416 417 418
    msg_Dbg( s, "pre buffering" );
    i_start = mdate();
    for( ;; )
419
    {
420 421
        int64_t i_date = mdate();
        block_t *b;
422

423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440
        if( s->b_die ||
            p_sys->block.i_size > STREAM_CACHE_PREBUFFER_SIZE ||
            ( i_first > 0 && i_first + STREAM_CACHE_PREBUFFER_LENGTH < i_date ) )
        {
            int64_t i_byterate;

            /* Update stat */
            p_sys->stat.i_bytes = p_sys->block.i_size;
            p_sys->stat.i_read_time = i_date - i_start;
            i_byterate = ( I64C(1000000) * p_sys->stat.i_bytes ) /
                         (p_sys->stat.i_read_time+1);

            msg_Dbg( s, "prebuffering done %lld bytes in %llds - %lld kbytes/s",
                     p_sys->stat.i_bytes,
                     p_sys->stat.i_read_time / I64C(1000000),
                     i_byterate / 1024 );
            break;
        }
441

442 443
        /* Fetch a block */
        if( ( b = p_access->pf_block( p_access ) ) == NULL )
444
        {
445 446 447 448 449
            if( p_access->info.b_eof )
                break;

            msleep( STREAM_DATA_WAIT );
            continue;
450
        }
451 452 453 454 455 456 457 458 459 460

        if( i_first == 0 )
            i_first = mdate();

        /* Append the block */
        p_sys->block.i_size += b->i_buffer;
        *p_sys->block.pp_last = b;
        p_sys->block.pp_last = &b->p_next;

        p_sys->stat.i_read_count++;
461 462
    }

463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479
    p_sys->block.p_current = p_sys->block.p_first;
}

static int AStreamRefillBlock( stream_t *s );

static int AStreamReadBlock( stream_t *s, void *p_read, int i_read )
{
    stream_sys_t *p_sys = s->p_sys;

    uint8_t *p_data= (uint8_t*)p_read;
    int     i_data = 0;

    /* It means EOF */
    if( p_sys->block.p_current == NULL )
        return 0;

    while( i_data < i_read )
480
    {
481 482
        int i_current = p_sys->block.p_current->i_buffer - p_sys->block.i_offset;
        int i_copy = __MIN( i_current, i_read - i_data);
Gildas Bazin's avatar
 
Gildas Bazin committed
483

484 485
        /* Copy data */
        if( p_data )
486
        {
487 488 489 490
            memcpy( p_data, &p_sys->block.p_current->p_buffer[p_sys->block.i_offset], i_copy );
            p_data += i_copy;
        }
        i_data += i_copy;
491

492 493 494 495 496 497 498 499 500 501 502
        p_sys->block.i_offset += i_copy;
        if( p_sys->block.i_offset >= p_sys->block.p_current->i_buffer )
        {
            /* Current block is now empty, switch to next */
            if( p_sys->block.p_current )
            {
                p_sys->block.i_offset = 0;
                p_sys->block.p_current = p_sys->block.p_current->p_next;
            }
            /*Get a new block */
            if( AStreamRefillBlock( s ) )
Gildas Bazin's avatar
Gildas Bazin committed
503 504 505
            {
                break;
            }
506 507 508
        }
    }

509 510
    p_sys->i_pos += i_data;
    return i_data;
511
}
Gildas Bazin's avatar
Gildas Bazin committed
512

513
static int AStreamPeekBlock( stream_t *s, uint8_t **pp_peek, int i_read )
Sigmund Augdal Helberg's avatar
Sigmund Augdal Helberg committed
514
{
515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576
    stream_sys_t *p_sys = s->p_sys;
    uint8_t *p_data;
    int      i_data = 0;
    block_t *b;
    int      i_offset;

    if( p_sys->block.p_current == NULL )
        return 0; /* EOF */

    /* We can directly give a pointer over our buffer */
    if( i_read <= p_sys->block.p_current->i_buffer - p_sys->block.i_offset )
    {
        *pp_peek = &p_sys->block.p_current->p_buffer[p_sys->block.i_offset];
        return i_read;
    }

    /* We need to create a local copy */
    if( p_sys->i_peek < i_read )
    {
        if( p_sys->p_peek )
            free( p_sys->p_peek );
        p_sys->i_peek = i_read;
        p_sys->p_peek = malloc( p_sys->i_peek );
    }

    /* Fill enough data */
    while( p_sys->block.i_size - (p_sys->i_pos - p_sys->block.i_start) < i_read )
    {
        block_t **pp_last = p_sys->block.pp_last;

        if( AStreamRefillBlock( s ) )
            break;

        /* Our buffer are probably filled enough, don't try anymore */
        if( pp_last == p_sys->block.pp_last )
            break;
    }

    /* Copy what we have */
    b = p_sys->block.p_current;
    i_offset = p_sys->block.i_offset;
    p_data = p_sys->p_peek;

    while( b && i_data < i_read )
    {
        int i_current = b->i_buffer - i_offset;
        int i_copy = __MIN( i_current, i_read - i_data );

        memcpy( p_data, &b->p_buffer[i_offset], i_copy );
        i_data += i_copy;
        p_data += i_copy;
        i_offset += i_copy;

        if( i_offset >= b->i_buffer )
        {
            i_offset = 0;
            b = b->p_next;
        }
    }

    *pp_peek = p_sys->p_peek;
    return i_data;
Sigmund Augdal Helberg's avatar
Sigmund Augdal Helberg committed
577
}
578

579
static int AStreamSeekBlock( stream_t *s, int64_t i_pos )
580
{
581 582 583 584
    stream_sys_t *p_sys = s->p_sys;
    access_t   *p_access = p_sys->p_access;
    int64_t    i_offset = i_pos - p_sys->block.i_start;
    vlc_bool_t b_seek;
585

586 587 588 589 590
    /* We already have thoses data, just update p_current/i_offset */
    if( i_offset >= 0 && i_offset < p_sys->block.i_size )
    {
        block_t *b = p_sys->block.p_first;
        int i_current = 0;
591

592 593 594 595 596
        while( i_current + b->i_buffer < i_offset )
        {
            i_current += b->i_buffer;
            b = b->p_next;
        }
597

598 599
        p_sys->block.p_current = b;
        p_sys->block.i_offset = i_offset - i_current;
600

601
        p_sys->i_pos = i_pos;
602

603 604
        return VLC_SUCCESS;
    }
605

606 607
    /* We may need to seek or to read data */
    if( i_offset < 0 )
608
    {
609 610 611 612 613 614 615 616 617 618
        vlc_bool_t b_aseek;
        access2_Control( p_access, ACCESS_CAN_SEEK, &b_aseek );

        if( !b_aseek )
        {
            msg_Err( s, "backward seek impossible (access non seekable)" );
            return VLC_EGENERIC;
        }

        b_seek = VLC_TRUE;
619
    }
620 621 622
    else
    {
        vlc_bool_t b_aseek, b_aseekfast;
623

624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650
        access2_Control( p_access, ACCESS_CAN_SEEK, &b_aseek );
        access2_Control( p_access, ACCESS_CAN_FASTSEEK, &b_aseekfast );

        if( !b_aseek )
        {
            b_seek = VLC_FALSE;
            msg_Warn( s, "%lld bytes need to be skipped (access non seekable)",
                      i_offset - p_sys->block.i_size );
        }
        else
        {
            int64_t i_skip = i_offset - p_sys->block.i_size;

            /* Avg bytes per packets */
            int i_avg = p_sys->stat.i_bytes / p_sys->stat.i_read_count;
            /* TODO compute a seek cost instead of fixed threshold */
            int i_th = b_aseekfast ? 1 : 5;

            if( i_skip <= i_th * i_avg &&
                i_skip < STREAM_CACHE_SIZE )
                b_seek = VLC_FALSE;
            else
                b_seek = VLC_TRUE;

            msg_Dbg( s, "b_seek=%d th*avg=%d skip=%lld",
                     b_seek, i_th*i_avg, i_skip );
        }
651 652
    }

653 654 655 656 657 658 659 660
    if( b_seek )
    {
        int64_t i_start, i_end;
        /* Do the access seek */
        i_start = mdate();
        if( p_access->pf_seek( p_access, i_pos ) )
            return VLC_EGENERIC;
        i_end = mdate();
661

662 663 664 665 666 667 668 669 670 671
        /* Release data */
        block_ChainRelease( p_sys->block.p_first );

        /* Reinit */
        p_sys->block.i_start = p_sys->i_pos = i_pos;
        p_sys->block.i_offset = 0;
        p_sys->block.p_current = NULL;
        p_sys->block.i_size = 0;
        p_sys->block.p_first = NULL;
        p_sys->block.pp_last = &p_sys->block.p_first;
672

673 674 675 676 677 678 679 680 681 682 683 684
        /* Refill a block */
        if( AStreamRefillBlock( s ) )
        {
            msg_Err( s, "cannot re fill buffer" );
            return VLC_EGENERIC;
        }
        /* Update stat */
        p_sys->stat.i_seek_time += i_end - i_start;
        p_sys->stat.i_seek_count++;
        return VLC_SUCCESS;
    }
    else
685
    {
686 687
        /* Read enought data */
        while( p_sys->block.i_start + p_sys->block.i_size < i_pos )
688
        {
689 690 691 692 693 694 695
            if( AStreamRefillBlock( s ) )
            {
                msg_Err( s, "can't read enough data in seek" );
                return VLC_EGENERIC;
            }
            while( p_sys->block.p_current &&
                   p_sys->i_pos + p_sys->block.p_current->i_buffer < i_pos )
696
            {
697 698
                p_sys->i_pos += p_sys->block.p_current->i_buffer;
                p_sys->block.p_current = p_sys->block.p_current->p_next;
699 700 701
            }
        }

702 703
        p_sys->block.i_offset = i_pos - p_sys->i_pos;
        p_sys->i_pos = i_pos;
704

705 706
        /* TODO read data */
        return VLC_SUCCESS;
707 708
    }

709
    return VLC_EGENERIC;
710 711
}

712
static int AStreamRefillBlock( stream_t *s )
713
{
714 715 716 717 718 719 720 721 722 723
    stream_sys_t *p_sys = s->p_sys;
    access_t     *p_access = p_sys->p_access;
    int64_t      i_start, i_stop;
    block_t      *b;

    /* Release data */
    while( p_sys->block.i_size >= STREAM_CACHE_SIZE &&
           p_sys->block.p_first != p_sys->block.p_current )
    {
        block_t *b = p_sys->block.p_first;
724

725 726 727
        p_sys->block.i_start += b->i_buffer;
        p_sys->block.i_size  -= b->i_buffer;
        p_sys->block.p_first  = b->p_next;
728

729 730 731 732 733
        block_Release( b );
    }
    if( p_sys->block.i_size >= STREAM_CACHE_SIZE &&
        p_sys->block.p_current == p_sys->block.p_first &&
        p_sys->block.p_current->p_next )    /* At least 2 packets */
734
    {
735 736
        /* Enough data, don't read more */
        return VLC_SUCCESS;
737 738
    }

739 740 741
    /* Now read a new block */
    i_start = mdate();
    for( ;; )
742
    {
743 744 745 746 747 748 749 750 751 752 753 754
        if( s->b_die )
            return VLC_EGENERIC;


        /* Fetch a block */
        if( ( b = p_access->pf_block( p_access ) ) )
            break;

        if( p_access->info.b_eof )
            return VLC_EGENERIC;

        msleep( STREAM_DATA_WAIT );
755
    }
756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772
    i_stop = mdate();

    /* Append the block */
    p_sys->block.i_size += b->i_buffer;
    *p_sys->block.pp_last = b;
    p_sys->block.pp_last = &b->p_next;

    /* Fix p_current */
    if( p_sys->block.p_current == NULL )
        p_sys->block.p_current = b;

    /* Update stat */
    p_sys->stat.i_bytes += b->i_buffer;
    p_sys->stat.i_read_time += i_stop - i_start;
    p_sys->stat.i_read_count++;

    return VLC_SUCCESS;
773 774 775
}


776 777 778 779 780 781
/****************************************************************************
 * Method 2:
 ****************************************************************************/
static int AStreamRefillStream( stream_t *s );

static int AStreamReadStream( stream_t *s, void *p_read, int i_read )
782
{
783 784
    stream_sys_t *p_sys = s->p_sys;
    stream_track_t *tk = &p_sys->stream.tk[p_sys->stream.i_tk];
785

786 787
    uint8_t *p_data = (uint8_t*)p_read;
    int      i_data = 0;
788

789 790
    if( tk->i_start >= tk->i_end  )
        return 0;   /* EOF */
791

792 793 794 795 796 797 798
    /*msg_Dbg( s, "AStreamReadStream: %d pos=%lld tk=%d start=%lld offset=%d end=%lld",
             i_read,
             p_sys->i_pos,
             p_sys->stream.i_tk,
             tk->i_start, p_sys->stream.i_offset, tk->i_end );*/

    while( i_data < i_read )
799
    {
800 801 802 803 804 805 806
        int i_off = (tk->i_start + p_sys->stream.i_offset) % STREAM_CACHE_TRACK_SIZE;
        int i_current = __MIN( tk->i_end - tk->i_start - p_sys->stream.i_offset, STREAM_CACHE_TRACK_SIZE - i_off );
        int i_copy = __MIN( i_current, i_read - i_data );

        /* Copy data */
        //msg_Dbg( s, "AStreamReadStream: copy %d", i_copy );
        if( p_data )
807
        {
808 809
            memcpy( p_data, &tk->p_buffer[i_off], i_copy );
            p_data += i_copy;
810
        }
811 812 813 814
        i_data += i_copy;
        p_sys->stream.i_offset += i_copy;

        /* Update pos now */
815 816
        p_sys->i_pos += i_copy;

817 818 819 820
        /* */
        p_sys->stream.i_used += i_copy;
        if( tk->i_start + p_sys->stream.i_offset >= tk->i_end ||
            p_sys->stream.i_used >= p_sys->stream.i_read_size )
821
        {
822 823 824 825 826 827
            if( AStreamRefillStream( s ) )
            {
                /* Eof */
                if( tk->i_start >= tk->i_end )
                    break;
            }
828 829 830
        }
    }

831
    return i_data;
832
}
833 834

static int AStreamPeekStream( stream_t *s, uint8_t **pp_peek, int i_read )
835
{
836 837 838
    stream_sys_t *p_sys = s->p_sys;
    stream_track_t *tk = &p_sys->stream.tk[p_sys->stream.i_tk];
    int64_t i_off;
839

840 841 842 843 844 845 846 847 848 849 850 851 852 853
    if( tk->i_start >= tk->i_end  )
        return 0;   /* EOF */

    /*msg_Dbg( s, "AStreamPeekStream: %d pos=%lld tk=%d start=%lld offset=%d end=%lld",
             i_read,
             p_sys->i_pos,
             p_sys->stream.i_tk,
             tk->i_start, p_sys->stream.i_offset, tk->i_end );*/

    /* Avoid problem, but that should *never* happen */
    if( i_read > STREAM_CACHE_TRACK_SIZE / 2 )
        i_read = STREAM_CACHE_TRACK_SIZE / 2;

    while( tk->i_end - tk->i_start - p_sys->stream.i_offset < i_read )
854
    {
855
        if( AStreamRefillStream( s ) )
856 857 858
            break;
    }

859 860
    if( tk->i_end - tk->i_start - p_sys->stream.i_offset < i_read )
        i_read = tk->i_end - tk->i_start - p_sys->stream.i_offset;
861

862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881
    /* Now, direct pointer or a copy ? */
    i_off = (tk->i_start + p_sys->stream.i_offset) % STREAM_CACHE_TRACK_SIZE;
    if( i_off + i_read <= STREAM_CACHE_TRACK_SIZE )
    {
        *pp_peek = &tk->p_buffer[i_off];
        return i_read;
    }

    if( p_sys->i_peek < i_read )
    {
        if( p_sys->p_peek ) free( p_sys->p_peek );
        p_sys->i_peek = i_read;
        p_sys->p_peek = malloc( i_read );
    }

    memcpy( p_sys->p_peek, &tk->p_buffer[i_off], STREAM_CACHE_TRACK_SIZE - i_off );
    memcpy( &p_sys->p_peek[STREAM_CACHE_TRACK_SIZE - i_off], &tk->p_buffer[0], i_read - (STREAM_CACHE_TRACK_SIZE - i_off) );

    *pp_peek = p_sys->p_peek;
    return i_read;
882 883
}

884
static int AStreamSeekStream( stream_t *s, int64_t i_pos )
885
{
886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904
    stream_sys_t *p_sys = s->p_sys;
    access_t     *p_access = p_sys->p_access;
    vlc_bool_t   b_aseek;
    vlc_bool_t   b_afastseek;
    int i_maxth;
    int i_new;
    int i;

    /*
    msg_Dbg( s, "AStreamSeekStream: to %lld pos=%lld tk=%d start=%lld offset=%d end=%lld",
             i_pos,
             p_sys->i_pos,
             p_sys->stream.i_tk,
             p_sys->stream.tk[p_sys->stream.i_tk].i_start, p_sys->stream.i_offset, p_sys->stream.tk[p_sys->stream.i_tk].i_end );*/


    /* Seek in our current track ? */
    if( i_pos >= p_sys->stream.tk[p_sys->stream.i_tk].i_start &&
        i_pos < p_sys->stream.tk[p_sys->stream.i_tk].i_end )
905
    {
906 907 908 909 910
        //msg_Dbg( s, "AStreamSeekStream: current track" );
        p_sys->i_pos = i_pos;
        p_sys->stream.i_offset = i_pos - p_sys->stream.tk[p_sys->stream.i_tk].i_start;
        return VLC_SUCCESS;
    }
911

912 913 914 915 916 917
    access2_Control( p_access, ACCESS_CAN_SEEK, &b_aseek );
    if( !b_aseek )
    {
        /* We can't do nothing */
        return VLC_EGENERIC;
    }
918

919 920
    /* Date the current track */
    p_sys->stream.tk[p_sys->stream.i_tk].i_date = mdate();
921

922 923 924 925
    /* Try to reuse already read data */
    for( i = 0; i < STREAM_CACHE_TRACK; i++ )
    {
        stream_track_t *tk = &p_sys->stream.tk[i];
926

927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945
        if( i_pos >= tk->i_start && i_pos <= tk->i_end )
        {
            /*msg_Dbg( s, "AStreamSeekStream: reusing %d start=%lld end=%lld",
                     i,
                     tk->i_start, tk->i_end );*/
            /* Seek at the end of the buffer */
            if( p_access->pf_seek( p_access, tk->i_end ) )
                return VLC_EGENERIC;

            /* That's it */
            p_sys->i_pos = i_pos;
            p_sys->stream.i_tk = i;
            p_sys->stream.i_offset = i_pos - tk->i_start;

            if( p_sys->stream.i_used < 1024 )
                p_sys->stream.i_used = 1024;

            if( AStreamRefillStream( s ) )
                return VLC_EGENERIC;
946 947

            return VLC_SUCCESS;
948 949
        }
    }
950

951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971
    access2_Control( p_access, ACCESS_CAN_SEEK, &b_afastseek );
    /* FIXME compute seek cost (instead of static 'stupid' value) */
    i_maxth = __MIN( p_sys->stream.i_read_size, STREAM_READ_ATONCE / 2 );
    if( !b_afastseek )
        i_maxth *= 3;

    /* FIXME TODO */
#if 0
    /* Search closest segment TODO */
    for( i = 0; i < STREAM_CACHE_TRACK; i++ )
    {
        stream_track_t *tk = &p_sys->stream.tk[i];

        if( i_pos + i_maxth >= tk->i_start )
        {
            msg_Dbg( s, "good segment before current pos, TODO" );
        }
        if( i_pos - i_maxth <= tk->i_end )
        {
            msg_Dbg( s, "good segment after current pos, TODO" );
        }
972
    }
973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000
#endif

    /* Nothing good, seek and choose oldest segment */
    if( p_access->pf_seek( p_access, i_pos ) )
        return VLC_EGENERIC;
    p_sys->i_pos = i_pos;

    i_new = 0;
    for( i = 1; i < STREAM_CACHE_TRACK; i++ )
    {
        if( p_sys->stream.tk[i].i_date < p_sys->stream.tk[i_new].i_date )
            i_new = i;
    }

    /* Reset the segment */
    p_sys->stream.i_tk     = i_new;
    p_sys->stream.i_offset =  0;
    p_sys->stream.tk[i_new].i_start = i_pos;
    p_sys->stream.tk[i_new].i_end   = i_pos;

    /* Read data */
    if( p_sys->stream.i_used < STREAM_READ_ATONCE / 2 )
        p_sys->stream.i_used = STREAM_READ_ATONCE / 2;

    if( AStreamRefillStream( s ) )
        return VLC_EGENERIC;

    return VLC_SUCCESS;
1001 1002
}

1003
static int AStreamRefillStream( stream_t *s )
1004
{
1005 1006 1007 1008 1009 1010
    stream_sys_t *p_sys = s->p_sys;
    access_t     *p_access = p_sys->p_access;
    stream_track_t *tk = &p_sys->stream.tk[p_sys->stream.i_tk];
    /* We read but won't increase i_start after initial start+offset */
    int i_toread = __MIN( p_sys->stream.i_used, STREAM_CACHE_TRACK_SIZE - (tk->i_end - tk->i_start - p_sys->stream.i_offset ) );
    int64_t i_start, i_stop;
1011

1012
    //msg_Dbg( s, "AStreamRefillStream: toread=%d", i_toread );
1013

1014 1015
    i_start = mdate();
    while( i_toread > 0 )
1016
    {
1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053
        int i_off = tk->i_end % STREAM_CACHE_TRACK_SIZE;
        int i_read;

        if( s->b_die )
            return VLC_EGENERIC;

        i_read = __MIN( i_toread, STREAM_CACHE_TRACK_SIZE - i_off );
        i_read = p_access->pf_read( p_access, &tk->p_buffer[i_off], i_read );
        //msg_Dbg( s, "AStreamRefillStream: read=%d", i_read );
        if( i_read <  0 )
        {
            msleep( STREAM_DATA_WAIT );
            continue;
        }
        else if( i_read == 0 )
        {
            return VLC_EGENERIC;
        }

        /* Update end */
        tk->i_end += i_read;

        /* Windows of STREAM_CACHE_TRACK_SIZE */
        if( tk->i_end - tk->i_start > STREAM_CACHE_TRACK_SIZE )
        {
            int i_invalid = tk->i_end - tk->i_start - STREAM_CACHE_TRACK_SIZE;

            tk->i_start += i_invalid;
            p_sys->stream.i_offset -= i_invalid;
        }


        i_toread -= i_read;
        p_sys->stream.i_used -= i_read;

        p_sys->stat.i_bytes += i_read;
        p_sys->stat.i_read_count++;
1054
    }
1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065
    i_stop = mdate();

    p_sys->stat.i_read_time += i_stop - i_start;

    return VLC_SUCCESS;
}

static void AStreamPrebufferStream( stream_t *s )
{
    stream_sys_t *p_sys = s->p_sys;
    access_t     *p_access = p_sys->p_access;
1066

1067 1068
    int64_t i_first = 0;
    int64_t i_start;
1069

1070 1071 1072
    msg_Dbg( s, "pre buffering" );
    i_start = mdate();
    for( ;; )
1073
    {
1074 1075 1076 1077 1078 1079 1080 1081
        stream_track_t *tk = &p_sys->stream.tk[p_sys->stream.i_tk];

        int64_t i_date = mdate();
        int i_read;

        if( s->b_die ||
            tk->i_end >= STREAM_CACHE_PREBUFFER_SIZE ||
            ( i_first > 0 && i_first + STREAM_CACHE_PREBUFFER_LENGTH < i_date ) )
1082
        {
1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094
            int64_t i_byterate;

            /* Update stat */
            p_sys->stat.i_bytes = tk->i_end - tk->i_start;
            p_sys->stat.i_read_time = i_date - i_start;
            i_byterate = ( I64C(1000000) * p_sys->stat.i_bytes ) /
                         (p_sys->stat.i_read_time+1);

            msg_Dbg( s, "prebuffering done %lld bytes in %llds - %lld kbytes/s",
                     p_sys->stat.i_bytes,
                     p_sys->stat.i_read_time / I64C(1000000),
                     i_byterate / 1024 );
1095 1096
            break;
        }
1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117

        /* */
        i_read = __MIN( p_sys->stream.i_read_size, STREAM_CACHE_TRACK_SIZE - tk->i_end );
        i_read = p_access->pf_read( p_access, &tk->p_buffer[tk->i_end], i_read );
        if( i_read <  0 )
        {
            msleep( STREAM_DATA_WAIT );
            continue;
        }
        else if( i_read == 0 )
        {
            /* EOF */
            break;
        }

        if( i_first == 0 )
            i_first = mdate();

        tk->i_end += i_read;

        p_sys->stat.i_read_count++;
1118 1119 1120 1121
    }
}


1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138
/****************************************************************************
 * stream_ReadLine:
 ****************************************************************************/
/**
 * Read from the stream untill first newline.
 * \param s Stream handle to read from
 * \return A null-terminated string. This must be freed,
 */
/* FIXME don't use stupid MAX_LINE -> do the same than net_ReadLine */
#define MAX_LINE 1024
char *stream_ReadLine( stream_t *s )
{
    uint8_t *p_data;
    char    *p_line;
    int      i_data;
    int      i = 0;
    i_data = stream_Peek( s, &p_data, MAX_LINE );
1139

1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157
    while( i < i_data && p_data[i] != '\n' &&  p_data[i] != '\r' )
    {
        i++;
    }
    if( i_data <= 0 )
    {
        return NULL;
    }
    else
    {
        p_line = malloc( i + 1 );
        if( p_line == NULL )
        {
            msg_Err( s, "out of memory" );
            return NULL;
        }
        i = stream_Read( s, p_line, i + 1 );
        p_line[ i - 1 ] = '\0';
1158

1159 1160 1161
        return p_line;
    }
}
1162