3 * Copyright (c) 2000,2001 Fabrice Bellard
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/bprint.h"
23 #include "libavutil/crc.h"
24 #include "libavutil/dict.h"
25 #include "libavutil/intreadwrite.h"
26 #include "libavutil/log.h"
27 #include "libavutil/opt.h"
28 #include "libavutil/avassert.h"
31 #include "avio_internal.h"
36 #define IO_BUFFER_SIZE 32768
39 * Do seeks within this distance ahead of the current buffer by skipping
40 * data instead of calling the protocol seek function, for seekable
43 #define SHORT_SEEK_THRESHOLD 32768
45 static void *ff_avio_child_next(void *obj, void *prev)
48 return prev ? NULL : s->opaque;
51 static const AVClass *child_class_iterate(void **iter)
53 const AVClass *c = *iter ? NULL : &ffurl_context_class;
54 *iter = (void*)(uintptr_t)c;
58 #define OFFSET(x) offsetof(AVIOContext,x)
59 #define E AV_OPT_FLAG_ENCODING_PARAM
60 #define D AV_OPT_FLAG_DECODING_PARAM
61 static const AVOption ff_avio_options[] = {
62 {"protocol_whitelist", "List of protocols that are allowed to be used", OFFSET(protocol_whitelist), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, D },
66 const AVClass ff_avio_class = {
67 .class_name = "AVIOContext",
68 .item_name = av_default_item_name,
69 .version = LIBAVUTIL_VERSION_INT,
70 .option = ff_avio_options,
71 .child_next = ff_avio_child_next,
72 .child_class_iterate = child_class_iterate,
75 static void fill_buffer(AVIOContext *s);
76 static int url_resetbuf(AVIOContext *s, int flags);
78 int ffio_init_context(AVIOContext *s,
79 unsigned char *buffer,
83 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
84 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
85 int64_t (*seek)(void *opaque, int64_t offset, int whence))
87 memset(s, 0, sizeof(AVIOContext));
91 s->buffer_size = buffer_size;
93 s->buf_ptr_max = buffer;
97 url_resetbuf(s, write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ);
99 s->write_packet = write_packet;
100 s->read_packet = read_packet;
105 s->seekable = seek ? AVIO_SEEKABLE_NORMAL : 0;
106 s->min_packet_size = 0;
107 s->max_packet_size = 0;
108 s->update_checksum = NULL;
109 s->short_seek_threshold = SHORT_SEEK_THRESHOLD;
111 if (!read_packet && !write_flag) {
112 s->pos = buffer_size;
113 s->buf_end = s->buffer + buffer_size;
115 s->read_pause = NULL;
118 s->write_data_type = NULL;
119 s->ignore_boundary_point = 0;
120 s->current_type = AVIO_DATA_MARKER_UNKNOWN;
121 s->last_time = AV_NOPTS_VALUE;
122 s->short_seek_get = NULL;
128 AVIOContext *avio_alloc_context(
129 unsigned char *buffer,
133 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
134 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
135 int64_t (*seek)(void *opaque, int64_t offset, int whence))
137 AVIOContext *s = av_malloc(sizeof(AVIOContext));
140 ffio_init_context(s, buffer, buffer_size, write_flag, opaque,
141 read_packet, write_packet, seek);
145 void avio_context_free(AVIOContext **ps)
150 static void writeout(AVIOContext *s, const uint8_t *data, int len)
154 if (s->write_data_type)
155 ret = s->write_data_type(s->opaque, (uint8_t *)data,
159 else if (s->write_packet)
160 ret = s->write_packet(s->opaque, (uint8_t *)data, len);
164 if (s->pos + len > s->written)
165 s->written = s->pos + len;
168 if (s->current_type == AVIO_DATA_MARKER_SYNC_POINT ||
169 s->current_type == AVIO_DATA_MARKER_BOUNDARY_POINT) {
170 s->current_type = AVIO_DATA_MARKER_UNKNOWN;
172 s->last_time = AV_NOPTS_VALUE;
173 s->writeout_count ++;
177 static void flush_buffer(AVIOContext *s)
179 s->buf_ptr_max = FFMAX(s->buf_ptr, s->buf_ptr_max);
180 if (s->write_flag && s->buf_ptr_max > s->buffer) {
181 writeout(s, s->buffer, s->buf_ptr_max - s->buffer);
182 if (s->update_checksum) {
183 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
184 s->buf_ptr_max - s->checksum_ptr);
185 s->checksum_ptr = s->buffer;
188 s->buf_ptr = s->buf_ptr_max = s->buffer;
190 s->buf_end = s->buffer;
193 void avio_w8(AVIOContext *s, int b)
195 av_assert2(b>=-128 && b<=255);
197 if (s->buf_ptr >= s->buf_end)
201 void ffio_fill(AVIOContext *s, int b, int count)
204 int len = FFMIN(s->buf_end - s->buf_ptr, count);
205 memset(s->buf_ptr, b, len);
208 if (s->buf_ptr >= s->buf_end)
215 void avio_write(AVIOContext *s, const unsigned char *buf, int size)
217 if (s->direct && !s->update_checksum) {
219 writeout(s, buf, size);
223 int len = FFMIN(s->buf_end - s->buf_ptr, size);
224 memcpy(s->buf_ptr, buf, len);
227 if (s->buf_ptr >= s->buf_end)
235 void avio_flush(AVIOContext *s)
237 int seekback = s->write_flag ? FFMIN(0, s->buf_ptr - s->buf_ptr_max) : 0;
240 avio_seek(s, seekback, SEEK_CUR);
243 int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
247 int force = whence & AVSEEK_FORCE;
250 whence &= ~AVSEEK_FORCE;
253 return AVERROR(EINVAL);
255 if ((whence & AVSEEK_SIZE))
256 return s->seek ? s->seek(s->opaque, offset, AVSEEK_SIZE) : AVERROR(ENOSYS);
258 buffer_size = s->buf_end - s->buffer;
259 // pos is the absolute position that the beginning of s->buffer corresponds to in the file
260 pos = s->pos - (s->write_flag ? 0 : buffer_size);
262 if (whence != SEEK_CUR && whence != SEEK_SET)
263 return AVERROR(EINVAL);
265 if (whence == SEEK_CUR) {
266 offset1 = pos + (s->buf_ptr - s->buffer);
269 if (offset > INT64_MAX - offset1)
270 return AVERROR(EINVAL);
274 return AVERROR(EINVAL);
276 short_seek = s->short_seek_threshold;
277 if (s->short_seek_get)
278 short_seek = FFMAX(s->short_seek_get(s->opaque), short_seek);
280 offset1 = offset - pos; // "offset1" is the relative offset from the beginning of s->buffer
281 s->buf_ptr_max = FFMAX(s->buf_ptr_max, s->buf_ptr);
282 if ((!s->direct || !s->seek) &&
283 offset1 >= 0 && offset1 <= (s->write_flag ? s->buf_ptr_max - s->buffer : buffer_size)) {
284 /* can do the seek inside the buffer */
285 s->buf_ptr = s->buffer + offset1;
286 } else if ((!(s->seekable & AVIO_SEEKABLE_NORMAL) ||
287 offset1 <= buffer_size + short_seek) &&
288 !s->write_flag && offset1 >= 0 &&
289 (!s->direct || !s->seek) &&
290 (whence != SEEK_END || force)) {
291 while(s->pos < offset && !s->eof_reached)
295 s->buf_ptr = s->buf_end - (s->pos - offset);
296 } else if(!s->write_flag && offset1 < 0 && -offset1 < buffer_size>>1 && s->seek && offset > 0) {
299 pos -= FFMIN(buffer_size>>1, pos);
300 if ((res = s->seek(s->opaque, pos, SEEK_SET)) < 0)
303 s->buf_ptr = s->buffer;
307 return avio_seek(s, offset, SEEK_SET | force);
314 return AVERROR(EPIPE);
315 if ((res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
319 s->buf_end = s->buffer;
320 s->buf_ptr = s->buf_ptr_max = s->buffer;
327 int64_t avio_skip(AVIOContext *s, int64_t offset)
329 return avio_seek(s, offset, SEEK_CUR);
332 int64_t avio_size(AVIOContext *s)
337 return AVERROR(EINVAL);
343 return AVERROR(ENOSYS);
344 size = s->seek(s->opaque, 0, AVSEEK_SIZE);
346 if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
349 s->seek(s->opaque, s->pos, SEEK_SET);
354 int avio_feof(AVIOContext *s)
362 return s->eof_reached;
365 void avio_wl32(AVIOContext *s, unsigned int val)
367 avio_w8(s, (uint8_t) val );
368 avio_w8(s, (uint8_t)(val >> 8 ));
369 avio_w8(s, (uint8_t)(val >> 16));
370 avio_w8(s, val >> 24 );
373 void avio_wb32(AVIOContext *s, unsigned int val)
375 avio_w8(s, val >> 24 );
376 avio_w8(s, (uint8_t)(val >> 16));
377 avio_w8(s, (uint8_t)(val >> 8 ));
378 avio_w8(s, (uint8_t) val );
381 int avio_put_str(AVIOContext *s, const char *str)
386 avio_write(s, (const unsigned char *) str, len);
392 static inline int put_str16(AVIOContext *s, const char *str, const int be)
394 const uint8_t *q = str;
402 GET_UTF8(ch, *q++, goto invalid;)
403 PUT_UTF16(ch, tmp, be ? avio_wb16(s, tmp) : avio_wl16(s, tmp);
407 av_log(s, AV_LOG_ERROR, "Invalid UTF8 sequence in avio_put_str16%s\n", be ? "be" : "le");
408 err = AVERROR(EINVAL);
422 #define PUT_STR16(type, big_endian) \
423 int avio_put_str16 ## type(AVIOContext *s, const char *str) \
425 return put_str16(s, str, big_endian); \
433 void avio_wl64(AVIOContext *s, uint64_t val)
435 avio_wl32(s, (uint32_t)(val & 0xffffffff));
436 avio_wl32(s, (uint32_t)(val >> 32));
439 void avio_wb64(AVIOContext *s, uint64_t val)
441 avio_wb32(s, (uint32_t)(val >> 32));
442 avio_wb32(s, (uint32_t)(val & 0xffffffff));
445 void avio_wl16(AVIOContext *s, unsigned int val)
447 avio_w8(s, (uint8_t)val);
448 avio_w8(s, (int)val >> 8);
451 void avio_wb16(AVIOContext *s, unsigned int val)
453 avio_w8(s, (int)val >> 8);
454 avio_w8(s, (uint8_t)val);
457 void avio_wl24(AVIOContext *s, unsigned int val)
459 avio_wl16(s, val & 0xffff);
460 avio_w8(s, (int)val >> 16);
463 void avio_wb24(AVIOContext *s, unsigned int val)
465 avio_wb16(s, (int)val >> 8);
466 avio_w8(s, (uint8_t)val);
469 void avio_write_marker(AVIOContext *s, int64_t time, enum AVIODataMarkerType type)
471 if (type == AVIO_DATA_MARKER_FLUSH_POINT) {
472 if (s->buf_ptr - s->buffer >= s->min_packet_size)
476 if (!s->write_data_type)
478 // If ignoring boundary points, just treat it as unknown
479 if (type == AVIO_DATA_MARKER_BOUNDARY_POINT && s->ignore_boundary_point)
480 type = AVIO_DATA_MARKER_UNKNOWN;
481 // Avoid unnecessary flushes if we are already in non-header/trailer
482 // data and setting the type to unknown
483 if (type == AVIO_DATA_MARKER_UNKNOWN &&
484 (s->current_type != AVIO_DATA_MARKER_HEADER &&
485 s->current_type != AVIO_DATA_MARKER_TRAILER))
489 case AVIO_DATA_MARKER_HEADER:
490 case AVIO_DATA_MARKER_TRAILER:
491 // For header/trailer, ignore a new marker of the same type;
492 // consecutive header/trailer markers can be merged.
493 if (type == s->current_type)
498 // If we've reached here, we have a new, noteworthy marker.
499 // Flush the previous data and mark the start of the new data.
501 s->current_type = type;
505 static int read_packet_wrapper(AVIOContext *s, uint8_t *buf, int size)
510 return AVERROR(EINVAL);
511 ret = s->read_packet(s->opaque, buf, size);
512 av_assert2(ret || s->max_packet_size);
518 static void fill_buffer(AVIOContext *s)
520 int max_buffer_size = s->max_packet_size ?
521 s->max_packet_size : IO_BUFFER_SIZE;
522 uint8_t *dst = s->buf_end - s->buffer + max_buffer_size <= s->buffer_size ?
523 s->buf_end : s->buffer;
524 int len = s->buffer_size - (dst - s->buffer);
526 /* can't fill the buffer without read_packet, just set EOF if appropriate */
527 if (!s->read_packet && s->buf_ptr >= s->buf_end)
530 /* no need to do anything if EOF already reached */
534 if (s->update_checksum && dst == s->buffer) {
535 if (s->buf_end > s->checksum_ptr)
536 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
537 s->buf_end - s->checksum_ptr);
538 s->checksum_ptr = s->buffer;
541 /* make buffer smaller in case it ended up large after probing */
542 if (s->read_packet && s->orig_buffer_size && s->buffer_size > s->orig_buffer_size && len >= s->orig_buffer_size) {
543 if (dst == s->buffer && s->buf_ptr != dst) {
544 int ret = ffio_set_buf_size(s, s->orig_buffer_size);
546 av_log(s, AV_LOG_WARNING, "Failed to decrease buffer size\n");
548 s->checksum_ptr = dst = s->buffer;
550 len = s->orig_buffer_size;
553 len = read_packet_wrapper(s, dst, len);
554 if (len == AVERROR_EOF) {
555 /* do not modify buffer if EOF reached so that a seek back can
556 be done without rereading data */
558 } else if (len < 0) {
564 s->buf_end = dst + len;
565 s->bytes_read += len;
569 unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
572 return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
575 unsigned long ff_crcEDB88320_update(unsigned long checksum, const uint8_t *buf,
578 return av_crc(av_crc_get_table(AV_CRC_32_IEEE_LE), checksum, buf, len);
581 unsigned long ff_crcA001_update(unsigned long checksum, const uint8_t *buf,
584 return av_crc(av_crc_get_table(AV_CRC_16_ANSI_LE), checksum, buf, len);
587 unsigned long ffio_get_checksum(AVIOContext *s)
589 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
590 s->buf_ptr - s->checksum_ptr);
591 s->update_checksum = NULL;
595 void ffio_init_checksum(AVIOContext *s,
596 unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
597 unsigned long checksum)
599 s->update_checksum = update_checksum;
600 if (s->update_checksum) {
601 s->checksum = checksum;
602 s->checksum_ptr = s->buf_ptr;
606 /* XXX: put an inline version */
607 int avio_r8(AVIOContext *s)
609 if (s->buf_ptr >= s->buf_end)
611 if (s->buf_ptr < s->buf_end)
612 return *s->buf_ptr++;
616 int avio_read(AVIOContext *s, unsigned char *buf, int size)
622 len = FFMIN(s->buf_end - s->buf_ptr, size);
623 if (len == 0 || s->write_flag) {
624 if((s->direct || size > s->buffer_size) && !s->update_checksum) {
625 // bypass the buffer and read data directly into buf
626 len = read_packet_wrapper(s, buf, size);
627 if (len == AVERROR_EOF) {
628 /* do not modify buffer if EOF reached so that a seek back can
629 be done without rereading data */
632 } else if (len < 0) {
638 s->bytes_read += len;
642 s->buf_ptr = s->buffer;
643 s->buf_end = s->buffer/* + len*/;
647 len = s->buf_end - s->buf_ptr;
652 memcpy(buf, s->buf_ptr, len);
659 if (s->error) return s->error;
660 if (avio_feof(s)) return AVERROR_EOF;
665 int ffio_read_size(AVIOContext *s, unsigned char *buf, int size)
667 int ret = avio_read(s, buf, size);
670 if (ret < 0 && ret != AVERROR_EOF)
672 return AVERROR_INVALIDDATA;
675 int ffio_read_indirect(AVIOContext *s, unsigned char *buf, int size, const unsigned char **data)
677 if (s->buf_end - s->buf_ptr >= size && !s->write_flag) {
683 return avio_read(s, buf, size);
687 int avio_read_partial(AVIOContext *s, unsigned char *buf, int size)
692 return AVERROR(EINVAL);
694 if (s->read_packet && s->write_flag) {
695 len = read_packet_wrapper(s, buf, size);
701 len = s->buf_end - s->buf_ptr;
704 len = s->buf_end - s->buf_ptr;
708 memcpy(buf, s->buf_ptr, len);
711 if (s->error) return s->error;
712 if (avio_feof(s)) return AVERROR_EOF;
717 unsigned int avio_rl16(AVIOContext *s)
721 val |= avio_r8(s) << 8;
725 unsigned int avio_rl24(AVIOContext *s)
729 val |= avio_r8(s) << 16;
733 unsigned int avio_rl32(AVIOContext *s)
737 val |= avio_rl16(s) << 16;
741 uint64_t avio_rl64(AVIOContext *s)
744 val = (uint64_t)avio_rl32(s);
745 val |= (uint64_t)avio_rl32(s) << 32;
749 unsigned int avio_rb16(AVIOContext *s)
752 val = avio_r8(s) << 8;
757 unsigned int avio_rb24(AVIOContext *s)
760 val = avio_rb16(s) << 8;
764 unsigned int avio_rb32(AVIOContext *s)
767 val = avio_rb16(s) << 16;
772 int ff_get_line(AVIOContext *s, char *buf, int maxlen)
779 if (c && i < maxlen-1)
781 } while (c != '\n' && c != '\r' && c);
782 if (c == '\r' && avio_r8(s) != '\n' && !avio_feof(s))
789 int ff_get_chomp_line(AVIOContext *s, char *buf, int maxlen)
791 int len = ff_get_line(s, buf, maxlen);
792 while (len > 0 && av_isspace(buf[len - 1]))
797 int64_t ff_read_line_to_bprint(AVIOContext *s, AVBPrint *bp)
808 end = (c == '\r' || c == '\n' || c == '\0');
811 } while (!end && len < sizeof(tmp));
812 av_bprint_append_data(bp, tmp, len);
816 if (c == '\r' && avio_r8(s) != '\n' && !avio_feof(s))
822 if (!c && !read && avio_feof(s))
828 int64_t ff_read_line_to_bprint_overwrite(AVIOContext *s, AVBPrint *bp)
833 ret = ff_read_line_to_bprint(s, bp);
837 if (!av_bprint_is_complete(bp))
838 return AVERROR(ENOMEM);
843 int avio_get_str(AVIOContext *s, int maxlen, char *buf, int buflen)
848 return AVERROR(EINVAL);
849 // reserve 1 byte for terminating 0
850 buflen = FFMIN(buflen - 1, maxlen);
851 for (i = 0; i < buflen; i++)
852 if (!(buf[i] = avio_r8(s)))
855 for (; i < maxlen; i++)
861 #define GET_STR16(type, read) \
862 int avio_get_str16 ##type(AVIOContext *pb, int maxlen, char *buf, int buflen)\
867 return AVERROR(EINVAL); \
868 while (ret + 1 < maxlen) {\
871 GET_UTF16(ch, (ret += 2) <= maxlen ? read(pb) : 0, break;)\
874 PUT_UTF8(ch, tmp, if (q - buf < buflen - 1) *q++ = tmp;)\
880 GET_STR16(le, avio_rl16)
881 GET_STR16(be, avio_rb16)
885 uint64_t avio_rb64(AVIOContext *s)
888 val = (uint64_t)avio_rb32(s) << 32;
889 val |= (uint64_t)avio_rb32(s);
893 uint64_t ffio_read_varlen(AVIOContext *bc){
899 val= (val<<7) + (tmp&127);
904 int ffio_fdopen(AVIOContext **s, URLContext *h)
906 uint8_t *buffer = NULL;
907 int buffer_size, max_packet_size;
909 max_packet_size = h->max_packet_size;
910 if (max_packet_size) {
911 buffer_size = max_packet_size; /* no need to bufferize more than one packet */
913 buffer_size = IO_BUFFER_SIZE;
915 if (!(h->flags & AVIO_FLAG_WRITE) && h->is_streamed) {
916 if (buffer_size > INT_MAX/2)
917 return AVERROR(EINVAL);
920 buffer = av_malloc(buffer_size);
922 return AVERROR(ENOMEM);
924 *s = avio_alloc_context(buffer, buffer_size, h->flags & AVIO_FLAG_WRITE, h,
925 (int (*)(void *, uint8_t *, int)) ffurl_read,
926 (int (*)(void *, uint8_t *, int)) ffurl_write,
927 (int64_t (*)(void *, int64_t, int))ffurl_seek);
931 (*s)->protocol_whitelist = av_strdup(h->protocol_whitelist);
932 if (!(*s)->protocol_whitelist && h->protocol_whitelist) {
936 (*s)->protocol_blacklist = av_strdup(h->protocol_blacklist);
937 if (!(*s)->protocol_blacklist && h->protocol_blacklist) {
941 (*s)->direct = h->flags & AVIO_FLAG_DIRECT;
943 (*s)->seekable = h->is_streamed ? 0 : AVIO_SEEKABLE_NORMAL;
944 (*s)->max_packet_size = max_packet_size;
945 (*s)->min_packet_size = h->min_packet_size;
947 (*s)->read_pause = (int (*)(void *, int))h->prot->url_read_pause;
949 (int64_t (*)(void *, int, int64_t, int))h->prot->url_read_seek;
951 if (h->prot->url_read_seek)
952 (*s)->seekable |= AVIO_SEEKABLE_TIME;
954 (*s)->short_seek_get = (int (*)(void *))ffurl_get_short_seek;
955 (*s)->av_class = &ff_avio_class;
959 return AVERROR(ENOMEM);
962 URLContext* ffio_geturlcontext(AVIOContext *s)
967 if (s->opaque && s->read_packet == (int (*)(void *, uint8_t *, int))ffurl_read)
973 static void update_checksum(AVIOContext *s)
975 if (s->update_checksum && s->buf_ptr > s->checksum_ptr) {
976 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
977 s->buf_ptr - s->checksum_ptr);
981 int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size)
984 int max_buffer_size = s->max_packet_size ?
985 s->max_packet_size : IO_BUFFER_SIZE;
986 ptrdiff_t filled = s->buf_end - s->buf_ptr;
988 if (buf_size <= s->buf_end - s->buf_ptr)
991 buf_size += max_buffer_size - 1;
993 if (buf_size + s->buf_ptr - s->buffer <= s->buffer_size || s->seekable || !s->read_packet)
995 av_assert0(!s->write_flag);
997 if (buf_size <= s->buffer_size) {
999 memmove(s->buffer, s->buf_ptr, filled);
1001 buffer = av_malloc(buf_size);
1003 return AVERROR(ENOMEM);
1005 memcpy(buffer, s->buf_ptr, filled);
1008 s->buffer_size = buf_size;
1010 s->buf_ptr = s->buffer;
1011 s->buf_end = s->buffer + filled;
1012 s->checksum_ptr = s->buffer;
1016 int ffio_set_buf_size(AVIOContext *s, int buf_size)
1019 buffer = av_malloc(buf_size);
1021 return AVERROR(ENOMEM);
1025 s->orig_buffer_size =
1026 s->buffer_size = buf_size;
1027 s->buf_ptr = s->buf_ptr_max = buffer;
1028 url_resetbuf(s, s->write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ);
1032 int ffio_realloc_buf(AVIOContext *s, int buf_size)
1037 if (!s->buffer_size)
1038 return ffio_set_buf_size(s, buf_size);
1040 if (buf_size <= s->buffer_size)
1043 buffer = av_malloc(buf_size);
1045 return AVERROR(ENOMEM);
1047 data_size = s->write_flag ? (s->buf_ptr - s->buffer) : (s->buf_end - s->buf_ptr);
1049 memcpy(buffer, s->write_flag ? s->buffer : s->buf_ptr, data_size);
1052 s->orig_buffer_size = buf_size;
1053 s->buffer_size = buf_size;
1054 s->buf_ptr = s->write_flag ? (s->buffer + data_size) : s->buffer;
1056 s->buf_ptr_max = s->buffer + data_size;
1058 s->buf_end = s->write_flag ? (s->buffer + s->buffer_size) : (s->buf_ptr + data_size);
1063 static int url_resetbuf(AVIOContext *s, int flags)
1065 av_assert1(flags == AVIO_FLAG_WRITE || flags == AVIO_FLAG_READ);
1067 if (flags & AVIO_FLAG_WRITE) {
1068 s->buf_end = s->buffer + s->buffer_size;
1071 s->buf_end = s->buffer;
1077 int ffio_rewind_with_probe_data(AVIOContext *s, unsigned char **bufp, int buf_size)
1079 int64_t buffer_start;
1081 int overlap, new_size, alloc_size;
1082 uint8_t *buf = *bufp;
1084 if (s->write_flag) {
1086 return AVERROR(EINVAL);
1089 buffer_size = s->buf_end - s->buffer;
1091 /* the buffers must touch or overlap */
1092 if ((buffer_start = s->pos - buffer_size) > buf_size) {
1094 return AVERROR(EINVAL);
1097 overlap = buf_size - buffer_start;
1098 new_size = buf_size + buffer_size - overlap;
1100 alloc_size = FFMAX(s->buffer_size, new_size);
1101 if (alloc_size > buf_size)
1102 if (!(buf = (*bufp) = av_realloc_f(buf, 1, alloc_size)))
1103 return AVERROR(ENOMEM);
1105 if (new_size > buf_size) {
1106 memcpy(buf + buf_size, s->buffer + overlap, buffer_size - overlap);
1107 buf_size = new_size;
1111 s->buf_ptr = s->buffer = buf;
1112 s->buffer_size = alloc_size;
1114 s->buf_end = s->buf_ptr + buf_size;
1120 int avio_open(AVIOContext **s, const char *filename, int flags)
1122 return avio_open2(s, filename, flags, NULL, NULL);
1125 int ffio_open_whitelist(AVIOContext **s, const char *filename, int flags,
1126 const AVIOInterruptCB *int_cb, AVDictionary **options,
1127 const char *whitelist, const char *blacklist
1135 err = ffurl_open_whitelist(&h, filename, flags, int_cb, options, whitelist, blacklist, NULL);
1138 err = ffio_fdopen(s, h);
1146 int avio_open2(AVIOContext **s, const char *filename, int flags,
1147 const AVIOInterruptCB *int_cb, AVDictionary **options)
1149 return ffio_open_whitelist(s, filename, flags, int_cb, options, NULL, NULL);
1152 int avio_close(AVIOContext *s)
1163 av_freep(&s->buffer);
1165 av_log(s, AV_LOG_VERBOSE, "Statistics: %d seeks, %d writeouts\n", s->seek_count, s->writeout_count);
1167 av_log(s, AV_LOG_VERBOSE, "Statistics: %"PRId64" bytes read, %d seeks\n", s->bytes_read, s->seek_count);
1170 avio_context_free(&s);
1172 return ffurl_close(h);
1175 int avio_closep(AVIOContext **s)
1177 int ret = avio_close(*s);
1182 int avio_printf(AVIOContext *s, const char *fmt, ...)
1187 av_bprint_init(&bp, 0, INT_MAX);
1189 av_vbprintf(&bp, fmt, ap);
1191 if (!av_bprint_is_complete(&bp)) {
1192 av_bprint_finalize(&bp, NULL);
1193 s->error = AVERROR(ENOMEM);
1194 return AVERROR(ENOMEM);
1196 avio_write(s, bp.str, bp.len);
1197 av_bprint_finalize(&bp, NULL);
1201 void avio_print_string_array(AVIOContext *s, const char *strings[])
1203 for(; *strings; strings++)
1204 avio_write(s, (const unsigned char *)*strings, strlen(*strings));
1207 int avio_pause(AVIOContext *s, int pause)
1210 return AVERROR(ENOSYS);
1211 return s->read_pause(s->opaque, pause);
1214 int64_t avio_seek_time(AVIOContext *s, int stream_index,
1215 int64_t timestamp, int flags)
1219 return AVERROR(ENOSYS);
1220 ret = s->read_seek(s->opaque, stream_index, timestamp, flags);
1223 s->buf_ptr = s->buf_end; // Flush buffer
1224 pos = s->seek(s->opaque, 0, SEEK_CUR);
1227 else if (pos != AVERROR(ENOSYS))
1233 int avio_read_to_bprint(AVIOContext *h, AVBPrint *pb, size_t max_size)
1238 ret = avio_read(h, buf, FFMIN(max_size, sizeof(buf)));
1239 if (ret == AVERROR_EOF)
1243 av_bprint_append_data(pb, buf, ret);
1244 if (!av_bprint_is_complete(pb))
1245 return AVERROR(ENOMEM);
1251 int avio_accept(AVIOContext *s, AVIOContext **c)
1254 URLContext *sc = s->opaque;
1255 URLContext *cc = NULL;
1256 ret = ffurl_accept(sc, &cc);
1259 return ffio_fdopen(c, cc);
1262 int avio_handshake(AVIOContext *c)
1264 URLContext *cc = c->opaque;
1265 return ffurl_handshake(cc);
1268 /* output in a dynamic buffer */
1270 typedef struct DynBuffer {
1271 int pos, size, allocated_size;
1274 uint8_t io_buffer[1];
1277 static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
1279 DynBuffer *d = opaque;
1282 /* reallocate buffer if needed */
1283 new_size = (unsigned)d->pos + buf_size;
1284 if (new_size < d->pos || new_size > INT_MAX)
1285 return AVERROR(ERANGE);
1286 if (new_size > d->allocated_size) {
1287 unsigned new_allocated_size = d->allocated_size ? d->allocated_size
1290 while (new_size > new_allocated_size)
1291 new_allocated_size += new_allocated_size / 2 + 1;
1293 new_allocated_size = FFMIN(new_allocated_size, INT_MAX);
1295 if ((err = av_reallocp(&d->buffer, new_allocated_size)) < 0) {
1296 d->allocated_size = 0;
1300 d->allocated_size = new_allocated_size;
1302 memcpy(d->buffer + d->pos, buf, buf_size);
1304 if (d->pos > d->size)
1309 static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
1311 unsigned char buf1[4];
1314 /* packetized write: output the header */
1315 AV_WB32(buf1, buf_size);
1316 ret = dyn_buf_write(opaque, buf1, 4);
1321 return dyn_buf_write(opaque, buf, buf_size);
1324 static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence)
1326 DynBuffer *d = opaque;
1328 if (whence == SEEK_CUR)
1330 else if (whence == SEEK_END)
1333 return AVERROR(EINVAL);
1334 if (offset > INT_MAX)
1335 return AVERROR(ERANGE);
1340 static int url_open_dyn_buf_internal(AVIOContext **s, int max_packet_size)
1343 unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024;
1345 if (sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
1346 return AVERROR(ERANGE);
1347 d = av_mallocz(sizeof(DynBuffer) + io_buffer_size);
1349 return AVERROR(ENOMEM);
1350 d->io_buffer_size = io_buffer_size;
1351 *s = avio_alloc_context(d->io_buffer, d->io_buffer_size, 1, d, NULL,
1352 max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
1353 max_packet_size ? NULL : dyn_buf_seek);
1356 return AVERROR(ENOMEM);
1358 (*s)->max_packet_size = max_packet_size;
1362 int avio_open_dyn_buf(AVIOContext **s)
1364 return url_open_dyn_buf_internal(s, 0);
1367 int ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size)
1369 if (max_packet_size <= 0)
1370 return AVERROR(EINVAL);
1371 return url_open_dyn_buf_internal(s, max_packet_size);
1374 int avio_get_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
1384 if (!s->error && !d->size) {
1385 *pbuffer = d->io_buffer;
1386 return FFMAX(s->buf_ptr, s->buf_ptr_max) - s->buffer;
1391 *pbuffer = d->buffer;
1396 void ffio_reset_dyn_buf(AVIOContext *s)
1398 DynBuffer *d = s->opaque;
1399 int max_packet_size = s->max_packet_size;
1401 ffio_init_context(s, d->io_buffer, d->io_buffer_size, 1, d, NULL,
1402 s->write_packet, s->seek);
1403 s->max_packet_size = max_packet_size;
1404 d->pos = d->size = 0;
1407 int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
1411 static const char padbuf[AV_INPUT_BUFFER_PADDING_SIZE] = {0};
1419 /* don't attempt to pad fixed-size packet buffers */
1420 if (!s->max_packet_size) {
1421 avio_write(s, padbuf, sizeof(padbuf));
1422 padding = AV_INPUT_BUFFER_PADDING_SIZE;
1428 *pbuffer = d->buffer;
1432 avio_context_free(&s);
1434 return size - padding;
1437 void ffio_free_dyn_buf(AVIOContext **s)
1447 avio_context_free(s);
1450 static int null_buf_write(void *opaque, uint8_t *buf, int buf_size)
1452 DynBuffer *d = opaque;
1455 if (d->pos > d->size)
1460 int ffio_open_null_buf(AVIOContext **s)
1462 int ret = url_open_dyn_buf_internal(s, 0);
1464 AVIOContext *pb = *s;
1465 pb->write_packet = null_buf_write;
1470 int ffio_close_null_buf(AVIOContext *s)
1472 DynBuffer *d = s->opaque;
1480 avio_context_free(&s);