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ffmpeg / libavformat / aviobuf.c @ 34f633df

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1 de6d9b64 Fabrice Bellard
/*
2
 * Buffered I/O for ffmpeg system
3 19720f15 Fabrice Bellard
 * Copyright (c) 2000,2001 Fabrice Bellard
4 de6d9b64 Fabrice Bellard
 *
5 19720f15 Fabrice Bellard
 * This library is free software; you can redistribute it and/or
6
 * modify it under the terms of the GNU Lesser General Public
7
 * License as published by the Free Software Foundation; either
8
 * version 2 of the License, or (at your option) any later version.
9 de6d9b64 Fabrice Bellard
 *
10 19720f15 Fabrice Bellard
 * This library is distributed in the hope that it will be useful,
11 de6d9b64 Fabrice Bellard
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 19720f15 Fabrice Bellard
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13
 * Lesser General Public License for more details.
14 de6d9b64 Fabrice Bellard
 *
15 19720f15 Fabrice Bellard
 * You should have received a copy of the GNU Lesser General Public
16
 * License along with this library; if not, write to the Free Software
17
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
18 de6d9b64 Fabrice Bellard
 */
19
#include "avformat.h"
20 5c91a675 Zdenek Kabelac
#include "avio.h"
21 abba3dd1 Fabrice Bellard
#include <stdarg.h>
22 de6d9b64 Fabrice Bellard
23
#define IO_BUFFER_SIZE 32768
24
25
int init_put_byte(ByteIOContext *s,
26
                  unsigned char *buffer,
27
                  int buffer_size,
28
                  int write_flag,
29
                  void *opaque,
30 0c1a9eda Zdenek Kabelac
                  int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
31 576ae256 Michael Niedermayer
                  int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
32 de6d9b64 Fabrice Bellard
                  int (*seek)(void *opaque, offset_t offset, int whence))
33
{
34
    s->buffer = buffer;
35
    s->buffer_size = buffer_size;
36
    s->buf_ptr = buffer;
37
    s->write_flag = write_flag;
38
    if (!s->write_flag) 
39
        s->buf_end = buffer;
40
    else
41
        s->buf_end = buffer + buffer_size;
42
    s->opaque = opaque;
43
    s->write_packet = write_packet;
44
    s->read_packet = read_packet;
45
    s->seek = seek;
46
    s->pos = 0;
47
    s->must_flush = 0;
48
    s->eof_reached = 0;
49 576ae256 Michael Niedermayer
    s->error = 0;
50 de6d9b64 Fabrice Bellard
    s->is_streamed = 0;
51 abba3dd1 Fabrice Bellard
    s->max_packet_size = 0;
52 ee9f36a8 Michael Niedermayer
    s->update_checksum= NULL;
53 de6d9b64 Fabrice Bellard
    return 0;
54
}
55
                  
56
57 764ef400 Mike Melanson
#ifdef CONFIG_ENCODERS
58 de6d9b64 Fabrice Bellard
static void flush_buffer(ByteIOContext *s)
59
{
60
    if (s->buf_ptr > s->buffer) {
61 576ae256 Michael Niedermayer
        if (s->write_packet && !s->error){
62
            int ret= s->write_packet(s->opaque, s->buffer, s->buf_ptr - s->buffer);
63
            if(ret < 0){
64
                s->error = ret;
65
            }
66
        }
67 465e1dad Michael Niedermayer
        if(s->update_checksum){
68 ee9f36a8 Michael Niedermayer
            s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
69
            s->checksum_ptr= s->buffer;
70
        }
71 de6d9b64 Fabrice Bellard
        s->pos += s->buf_ptr - s->buffer;
72
    }
73
    s->buf_ptr = s->buffer;
74
}
75
76
void put_byte(ByteIOContext *s, int b)
77
{
78
    *(s->buf_ptr)++ = b;
79
    if (s->buf_ptr >= s->buf_end) 
80
        flush_buffer(s);
81
}
82
83 75bdb984 Philip Gladstone
void put_buffer(ByteIOContext *s, const unsigned char *buf, int size)
84 de6d9b64 Fabrice Bellard
{
85
    int len;
86
87
    while (size > 0) {
88
        len = (s->buf_end - s->buf_ptr);
89
        if (len > size)
90
            len = size;
91
        memcpy(s->buf_ptr, buf, len);
92
        s->buf_ptr += len;
93
94
        if (s->buf_ptr >= s->buf_end) 
95
            flush_buffer(s);
96
97
        buf += len;
98
        size -= len;
99
    }
100
}
101
102
void put_flush_packet(ByteIOContext *s)
103
{
104
    flush_buffer(s);
105
    s->must_flush = 0;
106
}
107 764ef400 Mike Melanson
#endif //CONFIG_ENCODERS
108 de6d9b64 Fabrice Bellard
109
offset_t url_fseek(ByteIOContext *s, offset_t offset, int whence)
110
{
111
    offset_t offset1;
112
113
    if (whence != SEEK_CUR && whence != SEEK_SET)
114
        return -EINVAL;
115
    
116 764ef400 Mike Melanson
#ifdef CONFIG_ENCODERS
117 de6d9b64 Fabrice Bellard
    if (s->write_flag) {
118
        if (whence == SEEK_CUR) {
119 4606ac8d Zdenek Kabelac
            offset1 = s->pos + (s->buf_ptr - s->buffer);
120 de6d9b64 Fabrice Bellard
            if (offset == 0)
121
                return offset1;
122
            offset += offset1;
123
        }
124
        offset1 = offset - s->pos;
125
        if (!s->must_flush && 
126
            offset1 >= 0 && offset1 < (s->buf_end - s->buffer)) {
127
            /* can do the seek inside the buffer */
128
            s->buf_ptr = s->buffer + offset1;
129
        } else {
130
            if (!s->seek)
131
                return -EPIPE;
132
            flush_buffer(s);
133
            s->must_flush = 1;
134
            s->buf_ptr = s->buffer;
135
            s->seek(s->opaque, offset, SEEK_SET);
136
            s->pos = offset;
137
        }
138 764ef400 Mike Melanson
    } else 
139
#endif //CONFIG_ENCODERS
140
    {
141 de6d9b64 Fabrice Bellard
        if (whence == SEEK_CUR) {
142
            offset1 = s->pos - (s->buf_end - s->buffer) + (s->buf_ptr - s->buffer);
143
            if (offset == 0)
144
                return offset1;
145
            offset += offset1;
146
        }
147
        offset1 = offset - (s->pos - (s->buf_end - s->buffer));
148
        if (offset1 >= 0 && offset1 <= (s->buf_end - s->buffer)) {
149
            /* can do the seek inside the buffer */
150
            s->buf_ptr = s->buffer + offset1;
151
        } else {
152
            if (!s->seek)
153
                return -EPIPE;
154
            s->buf_ptr = s->buffer;
155
            s->buf_end = s->buffer;
156 53e2f9ca Michael Niedermayer
            if (s->seek(s->opaque, offset, SEEK_SET) == (offset_t)-EPIPE)
157
                return -EPIPE;
158 de6d9b64 Fabrice Bellard
            s->pos = offset;
159
        }
160 abba3dd1 Fabrice Bellard
        s->eof_reached = 0;
161 de6d9b64 Fabrice Bellard
    }
162
    return offset;
163
}
164
165
void url_fskip(ByteIOContext *s, offset_t offset)
166
{
167
    url_fseek(s, offset, SEEK_CUR);
168
}
169
170
offset_t url_ftell(ByteIOContext *s)
171
{
172
    return url_fseek(s, 0, SEEK_CUR);
173
}
174
175
int url_feof(ByteIOContext *s)
176
{
177
    return s->eof_reached;
178
}
179
180 576ae256 Michael Niedermayer
int url_ferror(ByteIOContext *s)
181
{
182
    return s->error;
183
}
184
185 764ef400 Mike Melanson
#ifdef CONFIG_ENCODERS
186 de6d9b64 Fabrice Bellard
void put_le32(ByteIOContext *s, unsigned int val)
187
{
188
    put_byte(s, val);
189
    put_byte(s, val >> 8);
190
    put_byte(s, val >> 16);
191
    put_byte(s, val >> 24);
192
}
193
194
void put_be32(ByteIOContext *s, unsigned int val)
195
{
196
    put_byte(s, val >> 24);
197
    put_byte(s, val >> 16);
198
    put_byte(s, val >> 8);
199
    put_byte(s, val);
200
}
201
202 3b4b29dc Fabrice Bellard
/* IEEE format is assumed */
203
void put_be64_double(ByteIOContext *s, double val)
204
{
205
    union {
206
        double d;
207 0c1a9eda Zdenek Kabelac
        uint64_t ull;
208 3b4b29dc Fabrice Bellard
    } u;
209
    u.d = val;
210
    put_be64(s, u.ull);
211 75bdb984 Philip Gladstone
}
212
213 3b4b29dc Fabrice Bellard
void put_strz(ByteIOContext *s, const char *str)
214 75bdb984 Philip Gladstone
{
215
    if (str)
216
        put_buffer(s, (const unsigned char *) str, strlen(str) + 1);
217
    else
218
        put_byte(s, 0);
219
}
220
221 0c1a9eda Zdenek Kabelac
void put_le64(ByteIOContext *s, uint64_t val)
222 de6d9b64 Fabrice Bellard
{
223 0c1a9eda Zdenek Kabelac
    put_le32(s, (uint32_t)(val & 0xffffffff));
224
    put_le32(s, (uint32_t)(val >> 32));
225 de6d9b64 Fabrice Bellard
}
226
227 0c1a9eda Zdenek Kabelac
void put_be64(ByteIOContext *s, uint64_t val)
228 de6d9b64 Fabrice Bellard
{
229 0c1a9eda Zdenek Kabelac
    put_be32(s, (uint32_t)(val >> 32));
230
    put_be32(s, (uint32_t)(val & 0xffffffff));
231 de6d9b64 Fabrice Bellard
}
232
233
void put_le16(ByteIOContext *s, unsigned int val)
234
{
235
    put_byte(s, val);
236
    put_byte(s, val >> 8);
237
}
238
239
void put_be16(ByteIOContext *s, unsigned int val)
240
{
241
    put_byte(s, val >> 8);
242
    put_byte(s, val);
243
}
244
245 0570bf06 Zdenek Kabelac
void put_tag(ByteIOContext *s, const char *tag)
246 de6d9b64 Fabrice Bellard
{
247
    while (*tag) {
248
        put_byte(s, *tag++);
249
    }
250
}
251 764ef400 Mike Melanson
#endif //CONFIG_ENCODERS
252 de6d9b64 Fabrice Bellard
253
/* Input stream */
254
255
static void fill_buffer(ByteIOContext *s)
256
{
257
    int len;
258
259 abba3dd1 Fabrice Bellard
    /* no need to do anything if EOF already reached */
260
    if (s->eof_reached)
261
        return;
262 ee9f36a8 Michael Niedermayer
263 465e1dad Michael Niedermayer
    if(s->update_checksum){
264 ee9f36a8 Michael Niedermayer
        s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_end - s->checksum_ptr);
265
        s->checksum_ptr= s->buffer;
266
    }
267
268 de6d9b64 Fabrice Bellard
    len = s->read_packet(s->opaque, s->buffer, s->buffer_size);
269 abba3dd1 Fabrice Bellard
    if (len <= 0) {
270
        /* do not modify buffer if EOF reached so that a seek back can
271
           be done without rereading data */
272 de6d9b64 Fabrice Bellard
        s->eof_reached = 1;
273 576ae256 Michael Niedermayer
    if(len<0)
274
        s->error= len;
275 abba3dd1 Fabrice Bellard
    } else {
276
        s->pos += len;
277
        s->buf_ptr = s->buffer;
278
        s->buf_end = s->buffer + len;
279 de6d9b64 Fabrice Bellard
    }
280
}
281
282 ee9f36a8 Michael Niedermayer
unsigned long get_checksum(ByteIOContext *s){
283
    s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
284 465e1dad Michael Niedermayer
    s->update_checksum= NULL;
285 ee9f36a8 Michael Niedermayer
    return s->checksum;
286
}
287
288
void init_checksum(ByteIOContext *s, unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len), unsigned long checksum){
289
    s->update_checksum= update_checksum;
290 465e1dad Michael Niedermayer
    if(s->update_checksum){
291
        s->checksum= s->update_checksum(checksum, NULL, 0);
292
        s->checksum_ptr= s->buf_ptr;
293
    }
294 ee9f36a8 Michael Niedermayer
}
295
296 abba3dd1 Fabrice Bellard
/* NOTE: return 0 if EOF, so you cannot use it if EOF handling is
297
   necessary */
298
/* XXX: put an inline version */
299 de6d9b64 Fabrice Bellard
int get_byte(ByteIOContext *s)
300
{
301
    if (s->buf_ptr < s->buf_end) {
302
        return *s->buf_ptr++;
303
    } else {
304
        fill_buffer(s);
305
        if (s->buf_ptr < s->buf_end)
306
            return *s->buf_ptr++;
307
        else
308
            return 0;
309
    }
310
}
311
312 abba3dd1 Fabrice Bellard
/* NOTE: return URL_EOF (-1) if EOF */
313
int url_fgetc(ByteIOContext *s)
314
{
315
    if (s->buf_ptr < s->buf_end) {
316
        return *s->buf_ptr++;
317
    } else {
318
        fill_buffer(s);
319
        if (s->buf_ptr < s->buf_end)
320
            return *s->buf_ptr++;
321
        else
322
            return URL_EOF;
323
    }
324
}
325
326 de6d9b64 Fabrice Bellard
int get_buffer(ByteIOContext *s, unsigned char *buf, int size)
327
{
328
    int len, size1;
329
330
    size1 = size;
331
    while (size > 0) {
332
        len = s->buf_end - s->buf_ptr;
333
        if (len > size)
334
            len = size;
335
        if (len == 0) {
336 3e2b6358 Michael Niedermayer
            if(size > s->buffer_size && !s->update_checksum){
337
                len = s->read_packet(s->opaque, buf, size);
338
                if (len <= 0) {
339
                    /* do not modify buffer if EOF reached so that a seek back can
340
                    be done without rereading data */
341
                    s->eof_reached = 1;
342
                    if(len<0)
343
                        s->error= len;
344
                    break;
345
                } else {
346
                    s->pos += len;
347
                    size -= len;
348
                    buf += len;
349
                    s->buf_ptr = s->buffer;
350
                    s->buf_end = s->buffer/* + len*/;
351
                }
352
            }else{
353
                fill_buffer(s);
354
                len = s->buf_end - s->buf_ptr;
355
                if (len == 0)
356
                    break;
357
            }
358 de6d9b64 Fabrice Bellard
        } else {
359
            memcpy(buf, s->buf_ptr, len);
360
            buf += len;
361
            s->buf_ptr += len;
362
            size -= len;
363
        }
364
    }
365
    return size1 - size;
366
}
367
368 e15dec10 Leon van Stuivenberg
int get_partial_buffer(ByteIOContext *s, unsigned char *buf, int size)
369
{
370
    int len;
371 0ecca7a4 Michael Niedermayer
    
372
    if(size<0)
373
        return -1;
374 e15dec10 Leon van Stuivenberg
375
    len = s->buf_end - s->buf_ptr;
376
    if (len == 0) {
377
        fill_buffer(s);
378
        len = s->buf_end - s->buf_ptr;
379
    }
380
    if (len > size)
381
        len = size;
382
    memcpy(buf, s->buf_ptr, len);
383
    s->buf_ptr += len;
384
    return len;
385
}
386
387 de6d9b64 Fabrice Bellard
unsigned int get_le16(ByteIOContext *s)
388
{
389
    unsigned int val;
390
    val = get_byte(s);
391
    val |= get_byte(s) << 8;
392
    return val;
393
}
394
395
unsigned int get_le32(ByteIOContext *s)
396
{
397
    unsigned int val;
398
    val = get_byte(s);
399
    val |= get_byte(s) << 8;
400
    val |= get_byte(s) << 16;
401
    val |= get_byte(s) << 24;
402
    return val;
403
}
404
405 0c1a9eda Zdenek Kabelac
uint64_t get_le64(ByteIOContext *s)
406 de6d9b64 Fabrice Bellard
{
407 0c1a9eda Zdenek Kabelac
    uint64_t val;
408
    val = (uint64_t)get_le32(s);
409
    val |= (uint64_t)get_le32(s) << 32;
410 de6d9b64 Fabrice Bellard
    return val;
411
}
412
413
unsigned int get_be16(ByteIOContext *s)
414
{
415
    unsigned int val;
416
    val = get_byte(s) << 8;
417
    val |= get_byte(s);
418
    return val;
419
}
420
421
unsigned int get_be32(ByteIOContext *s)
422
{
423
    unsigned int val;
424
    val = get_byte(s) << 24;
425
    val |= get_byte(s) << 16;
426
    val |= get_byte(s) << 8;
427
    val |= get_byte(s);
428
    return val;
429
}
430
431 3b4b29dc Fabrice Bellard
double get_be64_double(ByteIOContext *s)
432 75bdb984 Philip Gladstone
{
433 3b4b29dc Fabrice Bellard
    union {
434
        double d;
435 0c1a9eda Zdenek Kabelac
        uint64_t ull;
436 3b4b29dc Fabrice Bellard
    } u;
437 75bdb984 Philip Gladstone
438 3b4b29dc Fabrice Bellard
    u.ull = get_be64(s);
439
    return u.d;
440 75bdb984 Philip Gladstone
}
441
442 3b4b29dc Fabrice Bellard
char *get_strz(ByteIOContext *s, char *buf, int maxlen)
443 75bdb984 Philip Gladstone
{
444
    int i = 0;
445
    char c;
446
447
    while ((c = get_byte(s))) {
448
        if (i < maxlen-1)
449
            buf[i++] = c;
450
    }
451
    
452
    buf[i] = 0; /* Ensure null terminated, but may be truncated */
453
454
    return buf;
455
}
456
457 0c1a9eda Zdenek Kabelac
uint64_t get_be64(ByteIOContext *s)
458 de6d9b64 Fabrice Bellard
{
459 0c1a9eda Zdenek Kabelac
    uint64_t val;
460
    val = (uint64_t)get_be32(s) << 32;
461
    val |= (uint64_t)get_be32(s);
462 de6d9b64 Fabrice Bellard
    return val;
463
}
464
465
/* link with avio functions */
466
467 764ef400 Mike Melanson
#ifdef CONFIG_ENCODERS
468 576ae256 Michael Niedermayer
static int url_write_packet(void *opaque, uint8_t *buf, int buf_size)
469 de6d9b64 Fabrice Bellard
{
470
    URLContext *h = opaque;
471 576ae256 Michael Niedermayer
    return url_write(h, buf, buf_size);
472 de6d9b64 Fabrice Bellard
}
473 764ef400 Mike Melanson
#else
474
#define        url_write_packet NULL
475
#endif //CONFIG_ENCODERS
476 de6d9b64 Fabrice Bellard
477 0c1a9eda Zdenek Kabelac
static int url_read_packet(void *opaque, uint8_t *buf, int buf_size)
478 de6d9b64 Fabrice Bellard
{
479
    URLContext *h = opaque;
480
    return url_read(h, buf, buf_size);
481
}
482
483 0c1a9eda Zdenek Kabelac
static int url_seek_packet(void *opaque, int64_t offset, int whence)
484 de6d9b64 Fabrice Bellard
{
485
    URLContext *h = opaque;
486 53e2f9ca Michael Niedermayer
    return url_seek(h, offset, whence);
487
    //return 0;
488 de6d9b64 Fabrice Bellard
}
489
490
int url_fdopen(ByteIOContext *s, URLContext *h)
491
{
492 0c1a9eda Zdenek Kabelac
    uint8_t *buffer;
493 abba3dd1 Fabrice Bellard
    int buffer_size, max_packet_size;
494 de6d9b64 Fabrice Bellard
495 abba3dd1 Fabrice Bellard
    
496
    max_packet_size = url_get_max_packet_size(h);
497
    if (max_packet_size) {
498
        buffer_size = max_packet_size; /* no need to bufferize more than one packet */
499
    } else {
500
        buffer_size = IO_BUFFER_SIZE;
501
    }
502 1ea4f593 Fabrice Bellard
    buffer = av_malloc(buffer_size);
503 de6d9b64 Fabrice Bellard
    if (!buffer)
504
        return -ENOMEM;
505
506
    if (init_put_byte(s, buffer, buffer_size, 
507 ac9fe33d Gildas Bazin
                      (h->flags & URL_WRONLY || h->flags & URL_RDWR), h,
508 de6d9b64 Fabrice Bellard
                      url_read_packet, url_write_packet, url_seek_packet) < 0) {
509 1ea4f593 Fabrice Bellard
        av_free(buffer);
510 0bd586c5 Mike Melanson
        return AVERROR_IO;
511 de6d9b64 Fabrice Bellard
    }
512
    s->is_streamed = h->is_streamed;
513 abba3dd1 Fabrice Bellard
    s->max_packet_size = max_packet_size;
514 de6d9b64 Fabrice Bellard
    return 0;
515
}
516
517
/* XXX: must be called before any I/O */
518
int url_setbufsize(ByteIOContext *s, int buf_size)
519
{
520 0c1a9eda Zdenek Kabelac
    uint8_t *buffer;
521 1ea4f593 Fabrice Bellard
    buffer = av_malloc(buf_size);
522 de6d9b64 Fabrice Bellard
    if (!buffer)
523
        return -ENOMEM;
524
525 1ea4f593 Fabrice Bellard
    av_free(s->buffer);
526 de6d9b64 Fabrice Bellard
    s->buffer = buffer;
527
    s->buffer_size = buf_size;
528
    s->buf_ptr = buffer;
529
    if (!s->write_flag) 
530
        s->buf_end = buffer;
531
    else
532
        s->buf_end = buffer + buf_size;
533
    return 0;
534
}
535
536 abba3dd1 Fabrice Bellard
/* NOTE: when opened as read/write, the buffers are only used for
537
   reading */
538 de6d9b64 Fabrice Bellard
int url_fopen(ByteIOContext *s, const char *filename, int flags)
539
{
540
    URLContext *h;
541
    int err;
542
543
    err = url_open(&h, filename, flags);
544
    if (err < 0)
545
        return err;
546
    err = url_fdopen(s, h);
547
    if (err < 0) {
548
        url_close(h);
549
        return err;
550
    }
551
    return 0;
552
}
553
554
int url_fclose(ByteIOContext *s)
555
{
556
    URLContext *h = s->opaque;
557
    
558 1ea4f593 Fabrice Bellard
    av_free(s->buffer);
559 de6d9b64 Fabrice Bellard
    memset(s, 0, sizeof(ByteIOContext));
560
    return url_close(h);
561
}
562
563
URLContext *url_fileno(ByteIOContext *s)
564
{
565
    return s->opaque;
566
}
567
568 764ef400 Mike Melanson
#ifdef CONFIG_ENCODERS
569 abba3dd1 Fabrice Bellard
/* XXX: currently size is limited */
570
int url_fprintf(ByteIOContext *s, const char *fmt, ...)
571
{
572
    va_list ap;
573
    char buf[4096];
574
    int ret;
575
576
    va_start(ap, fmt);
577
    ret = vsnprintf(buf, sizeof(buf), fmt, ap);
578
    va_end(ap);
579
    put_buffer(s, buf, strlen(buf));
580
    return ret;
581
}
582 764ef400 Mike Melanson
#endif //CONFIG_ENCODERS
583 abba3dd1 Fabrice Bellard
584
/* note: unlike fgets, the EOL character is not returned and a whole
585
   line is parsed. return NULL if first char read was EOF */
586
char *url_fgets(ByteIOContext *s, char *buf, int buf_size)
587
{
588
    int c;
589
    char *q;
590
591
    c = url_fgetc(s);
592
    if (c == EOF)
593
        return NULL;
594
    q = buf;
595
    for(;;) {
596
        if (c == EOF || c == '\n')
597
            break;
598
        if ((q - buf) < buf_size - 1)
599
            *q++ = c;
600
        c = url_fgetc(s);
601
    }
602
    if (buf_size > 0)
603
        *q = '\0';
604
    return buf;
605
}
606
607
/* 
608
 * Return the maximum packet size associated to packetized buffered file
609
 * handle. If the file is not packetized (stream like http or file on
610
 * disk), then 0 is returned.
611
 * 
612
 * @param h buffered file handle
613
 * @return maximum packet size in bytes
614
 */
615
int url_fget_max_packet_size(ByteIOContext *s)
616
{
617
    return s->max_packet_size;
618
}
619
620 764ef400 Mike Melanson
#ifdef CONFIG_ENCODERS
621 de6d9b64 Fabrice Bellard
/* buffer handling */
622 0c1a9eda Zdenek Kabelac
int url_open_buf(ByteIOContext *s, uint8_t *buf, int buf_size, int flags)
623 de6d9b64 Fabrice Bellard
{
624
    return init_put_byte(s, buf, buf_size, 
625 ac9fe33d Gildas Bazin
                         (flags & URL_WRONLY || flags & URL_RDWR),
626
                         NULL, NULL, NULL, NULL);
627 de6d9b64 Fabrice Bellard
}
628
629
/* return the written or read size */
630
int url_close_buf(ByteIOContext *s)
631
{
632 abba3dd1 Fabrice Bellard
    put_flush_packet(s);
633 de6d9b64 Fabrice Bellard
    return s->buf_ptr - s->buffer;
634
}
635 abba3dd1 Fabrice Bellard
636
/* output in a dynamic buffer */
637
638
typedef struct DynBuffer {
639
    int pos, size, allocated_size;
640 0c1a9eda Zdenek Kabelac
    uint8_t *buffer;
641 abba3dd1 Fabrice Bellard
    int io_buffer_size;
642 0c1a9eda Zdenek Kabelac
    uint8_t io_buffer[1];
643 abba3dd1 Fabrice Bellard
} DynBuffer;
644
645 576ae256 Michael Niedermayer
static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
646 abba3dd1 Fabrice Bellard
{
647
    DynBuffer *d = opaque;
648
    int new_size, new_allocated_size;
649
    
650
    /* reallocate buffer if needed */
651
    new_size = d->pos + buf_size;
652
    new_allocated_size = d->allocated_size;
653 568e18b1 Michael Niedermayer
    if(new_size < d->pos || new_size > INT_MAX/2)
654
        return -1;
655 abba3dd1 Fabrice Bellard
    while (new_size > new_allocated_size) {
656
        if (!new_allocated_size)
657
            new_allocated_size = new_size;
658
        else
659 568e18b1 Michael Niedermayer
            new_allocated_size += new_allocated_size / 2 + 1;    
660 abba3dd1 Fabrice Bellard
    }
661
    
662
    if (new_allocated_size > d->allocated_size) {
663 b88ba823 Mark Hills
        d->buffer = av_realloc(d->buffer, new_allocated_size);
664
        if(d->buffer == NULL)
665 576ae256 Michael Niedermayer
             return -1234;
666 abba3dd1 Fabrice Bellard
        d->allocated_size = new_allocated_size;
667
    }
668
    memcpy(d->buffer + d->pos, buf, buf_size);
669
    d->pos = new_size;
670
    if (d->pos > d->size)
671
        d->size = d->pos;
672 576ae256 Michael Niedermayer
    return buf_size;
673 abba3dd1 Fabrice Bellard
}
674
675 576ae256 Michael Niedermayer
static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
676 abba3dd1 Fabrice Bellard
{
677
    unsigned char buf1[4];
678 576ae256 Michael Niedermayer
    int ret;
679 abba3dd1 Fabrice Bellard
680
    /* packetized write: output the header */
681
    buf1[0] = (buf_size >> 24);
682
    buf1[1] = (buf_size >> 16);
683
    buf1[2] = (buf_size >> 8);
684
    buf1[3] = (buf_size);
685 576ae256 Michael Niedermayer
    ret= dyn_buf_write(opaque, buf1, 4);
686
    if(ret < 0)
687
        return ret;
688 abba3dd1 Fabrice Bellard
689
    /* then the data */
690 576ae256 Michael Niedermayer
    return dyn_buf_write(opaque, buf, buf_size);
691 abba3dd1 Fabrice Bellard
}
692
693
static int dyn_buf_seek(void *opaque, offset_t offset, int whence)
694
{
695
    DynBuffer *d = opaque;
696
697
    if (whence == SEEK_CUR)
698
        offset += d->pos;
699
    else if (whence == SEEK_END)
700
        offset += d->size;
701
    if (offset < 0 || offset > 0x7fffffffLL)
702
        return -1;
703
    d->pos = offset;
704
    return 0;
705
}
706
707
static int url_open_dyn_buf_internal(ByteIOContext *s, int max_packet_size)
708
{
709
    DynBuffer *d;
710
    int io_buffer_size, ret;
711
    
712
    if (max_packet_size) 
713
        io_buffer_size = max_packet_size;
714
    else
715
        io_buffer_size = 1024;
716
        
717 568e18b1 Michael Niedermayer
    if(sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
718
        return -1;
719 abba3dd1 Fabrice Bellard
    d = av_malloc(sizeof(DynBuffer) + io_buffer_size);
720
    if (!d)
721
        return -1;
722
    d->io_buffer_size = io_buffer_size;
723
    d->buffer = NULL;
724
    d->pos = 0;
725
    d->size = 0;
726
    d->allocated_size = 0;
727
    ret = init_put_byte(s, d->io_buffer, io_buffer_size, 
728
                        1, d, NULL, 
729
                        max_packet_size ? dyn_packet_buf_write : dyn_buf_write, 
730
                        max_packet_size ? NULL : dyn_buf_seek);
731
    if (ret == 0) {
732
        s->max_packet_size = max_packet_size;
733
    }
734
    return ret;
735
}
736
737
/*
738
 * Open a write only memory stream.
739
 * 
740
 * @param s new IO context
741
 * @return zero if no error.
742
 */
743
int url_open_dyn_buf(ByteIOContext *s)
744
{
745
    return url_open_dyn_buf_internal(s, 0);
746
}
747
748
/*
749
 * Open a write only packetized memory stream with a maximum packet
750
 * size of 'max_packet_size'.  The stream is stored in a memory buffer
751
 * with a big endian 4 byte header giving the packet size in bytes.
752
 * 
753
 * @param s new IO context
754
 * @param max_packet_size maximum packet size (must be > 0) 
755
 * @return zero if no error.
756
 */
757
int url_open_dyn_packet_buf(ByteIOContext *s, int max_packet_size)
758
{
759
    if (max_packet_size <= 0)
760
        return -1;
761
    return url_open_dyn_buf_internal(s, max_packet_size);
762
}
763
764
/* 
765
 * Return the written size and a pointer to the buffer. The buffer
766
 *  must be freed with av_free(). 
767
 * @param s IO context
768
 * @param pointer to a byte buffer
769
 * @return the length of the byte buffer
770
 */
771 0c1a9eda Zdenek Kabelac
int url_close_dyn_buf(ByteIOContext *s, uint8_t **pbuffer)
772 abba3dd1 Fabrice Bellard
{
773
    DynBuffer *d = s->opaque;
774
    int size;
775
776
    put_flush_packet(s);
777
778
    *pbuffer = d->buffer;
779
    size = d->size;
780
    av_free(d);
781
    return size;
782
}
783 764ef400 Mike Melanson
#endif //CONFIG_ENCODERS