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 4096
45 static void *ff_avio_child_next(void *obj, void *prev)
48 return prev ? NULL : s->opaque;
51 static const AVClass *ff_avio_child_class_next(const AVClass *prev)
53 return prev ? NULL : &ffurl_context_class;
56 #define OFFSET(x) offsetof(AVIOContext,x)
57 #define E AV_OPT_FLAG_ENCODING_PARAM
58 #define D AV_OPT_FLAG_DECODING_PARAM
59 static const AVOption ff_avio_options[] = {
60 {"protocol_whitelist", "List of protocols that are allowed to be used", OFFSET(protocol_whitelist), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, D },
64 const AVClass ff_avio_class = {
65 .class_name = "AVIOContext",
66 .item_name = av_default_item_name,
67 .version = LIBAVUTIL_VERSION_INT,
68 .option = ff_avio_options,
69 .child_next = ff_avio_child_next,
70 .child_class_next = ff_avio_child_class_next,
73 static void fill_buffer(AVIOContext *s);
74 static int url_resetbuf(AVIOContext *s, int flags);
76 int ffio_init_context(AVIOContext *s,
77 unsigned char *buffer,
81 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
82 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
83 int64_t (*seek)(void *opaque, int64_t offset, int whence))
85 memset(s, 0, sizeof(AVIOContext));
89 s->buffer_size = buffer_size;
91 s->buf_ptr_max = buffer;
95 url_resetbuf(s, write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ);
97 s->write_packet = write_packet;
98 s->read_packet = read_packet;
103 s->seekable = seek ? AVIO_SEEKABLE_NORMAL : 0;
104 s->min_packet_size = 0;
105 s->max_packet_size = 0;
106 s->update_checksum = NULL;
107 s->short_seek_threshold = SHORT_SEEK_THRESHOLD;
109 if (!read_packet && !write_flag) {
110 s->pos = buffer_size;
111 s->buf_end = s->buffer + buffer_size;
113 s->read_pause = NULL;
116 s->write_data_type = NULL;
117 s->ignore_boundary_point = 0;
118 s->current_type = AVIO_DATA_MARKER_UNKNOWN;
119 s->last_time = AV_NOPTS_VALUE;
120 s->short_seek_get = NULL;
126 AVIOContext *avio_alloc_context(
127 unsigned char *buffer,
131 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
132 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
133 int64_t (*seek)(void *opaque, int64_t offset, int whence))
135 AVIOContext *s = av_malloc(sizeof(AVIOContext));
138 ffio_init_context(s, buffer, buffer_size, write_flag, opaque,
139 read_packet, write_packet, seek);
143 void avio_context_free(AVIOContext **ps)
148 static void writeout(AVIOContext *s, const uint8_t *data, int len)
152 if (s->write_data_type)
153 ret = s->write_data_type(s->opaque, (uint8_t *)data,
157 else if (s->write_packet)
158 ret = s->write_packet(s->opaque, (uint8_t *)data, len);
162 if (s->pos + len > s->written)
163 s->written = s->pos + len;
166 if (s->current_type == AVIO_DATA_MARKER_SYNC_POINT ||
167 s->current_type == AVIO_DATA_MARKER_BOUNDARY_POINT) {
168 s->current_type = AVIO_DATA_MARKER_UNKNOWN;
170 s->last_time = AV_NOPTS_VALUE;
171 s->writeout_count ++;
175 static void flush_buffer(AVIOContext *s)
177 s->buf_ptr_max = FFMAX(s->buf_ptr, s->buf_ptr_max);
178 if (s->write_flag && s->buf_ptr_max > s->buffer) {
179 writeout(s, s->buffer, s->buf_ptr_max - s->buffer);
180 if (s->update_checksum) {
181 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
182 s->buf_ptr_max - s->checksum_ptr);
183 s->checksum_ptr = s->buffer;
186 s->buf_ptr = s->buf_ptr_max = s->buffer;
188 s->buf_end = s->buffer;
191 void avio_w8(AVIOContext *s, int b)
193 av_assert2(b>=-128 && b<=255);
195 if (s->buf_ptr >= s->buf_end)
199 void ffio_fill(AVIOContext *s, int b, int count)
202 int len = FFMIN(s->buf_end - s->buf_ptr, count);
203 memset(s->buf_ptr, b, len);
206 if (s->buf_ptr >= s->buf_end)
213 void avio_write(AVIOContext *s, const unsigned char *buf, int size)
215 if (s->direct && !s->update_checksum) {
217 writeout(s, buf, size);
221 int len = FFMIN(s->buf_end - s->buf_ptr, size);
222 memcpy(s->buf_ptr, buf, len);
225 if (s->buf_ptr >= s->buf_end)
233 void avio_flush(AVIOContext *s)
235 int seekback = s->write_flag ? FFMIN(0, s->buf_ptr - s->buf_ptr_max) : 0;
238 avio_seek(s, seekback, SEEK_CUR);
241 int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
245 int force = whence & AVSEEK_FORCE;
248 whence &= ~AVSEEK_FORCE;
251 return AVERROR(EINVAL);
253 if ((whence & AVSEEK_SIZE))
254 return s->seek ? s->seek(s->opaque, offset, AVSEEK_SIZE) : AVERROR(ENOSYS);
256 buffer_size = s->buf_end - s->buffer;
257 // pos is the absolute position that the beginning of s->buffer corresponds to in the file
258 pos = s->pos - (s->write_flag ? 0 : buffer_size);
260 if (whence != SEEK_CUR && whence != SEEK_SET)
261 return AVERROR(EINVAL);
263 if (whence == SEEK_CUR) {
264 offset1 = pos + (s->buf_ptr - s->buffer);
267 if (offset > INT64_MAX - offset1)
268 return AVERROR(EINVAL);
272 return AVERROR(EINVAL);
274 if (s->short_seek_get) {
275 short_seek = s->short_seek_get(s->opaque);
276 /* fallback to default short seek */
278 short_seek = s->short_seek_threshold;
280 short_seek = s->short_seek_threshold;
282 offset1 = offset - pos; // "offset1" is the relative offset from the beginning of s->buffer
283 s->buf_ptr_max = FFMAX(s->buf_ptr_max, s->buf_ptr);
284 if ((!s->direct || !s->seek) &&
285 offset1 >= 0 && offset1 <= (s->write_flag ? s->buf_ptr_max - s->buffer : buffer_size)) {
286 /* can do the seek inside the buffer */
287 s->buf_ptr = s->buffer + offset1;
288 } else if ((!(s->seekable & AVIO_SEEKABLE_NORMAL) ||
289 offset1 <= buffer_size + short_seek) &&
290 !s->write_flag && offset1 >= 0 &&
291 (!s->direct || !s->seek) &&
292 (whence != SEEK_END || force)) {
293 while(s->pos < offset && !s->eof_reached)
297 s->buf_ptr = s->buf_end - (s->pos - offset);
298 } else if(!s->write_flag && offset1 < 0 && -offset1 < buffer_size>>1 && s->seek && offset > 0) {
301 pos -= FFMIN(buffer_size>>1, pos);
302 if ((res = s->seek(s->opaque, pos, SEEK_SET)) < 0)
305 s->buf_ptr = s->buffer;
309 return avio_seek(s, offset, SEEK_SET | force);
316 return AVERROR(EPIPE);
317 if ((res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
321 s->buf_end = s->buffer;
322 s->buf_ptr = s->buf_ptr_max = s->buffer;
329 int64_t avio_skip(AVIOContext *s, int64_t offset)
331 return avio_seek(s, offset, SEEK_CUR);
334 int64_t avio_size(AVIOContext *s)
339 return AVERROR(EINVAL);
345 return AVERROR(ENOSYS);
346 size = s->seek(s->opaque, 0, AVSEEK_SIZE);
348 if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
351 s->seek(s->opaque, s->pos, SEEK_SET);
356 int avio_feof(AVIOContext *s)
364 return s->eof_reached;
367 void avio_wl32(AVIOContext *s, unsigned int val)
369 avio_w8(s, (uint8_t) val );
370 avio_w8(s, (uint8_t)(val >> 8 ));
371 avio_w8(s, (uint8_t)(val >> 16));
372 avio_w8(s, val >> 24 );
375 void avio_wb32(AVIOContext *s, unsigned int val)
377 avio_w8(s, val >> 24 );
378 avio_w8(s, (uint8_t)(val >> 16));
379 avio_w8(s, (uint8_t)(val >> 8 ));
380 avio_w8(s, (uint8_t) val );
383 int avio_put_str(AVIOContext *s, const char *str)
388 avio_write(s, (const unsigned char *) str, len);
394 static inline int put_str16(AVIOContext *s, const char *str, const int be)
396 const uint8_t *q = str;
404 GET_UTF8(ch, *q++, goto invalid;)
405 PUT_UTF16(ch, tmp, be ? avio_wb16(s, tmp) : avio_wl16(s, tmp);
409 av_log(s, AV_LOG_ERROR, "Invalid UTF8 sequence in avio_put_str16%s\n", be ? "be" : "le");
410 err = AVERROR(EINVAL);
424 #define PUT_STR16(type, big_endian) \
425 int avio_put_str16 ## type(AVIOContext *s, const char *str) \
427 return put_str16(s, str, big_endian); \
435 void avio_wl64(AVIOContext *s, uint64_t val)
437 avio_wl32(s, (uint32_t)(val & 0xffffffff));
438 avio_wl32(s, (uint32_t)(val >> 32));
441 void avio_wb64(AVIOContext *s, uint64_t val)
443 avio_wb32(s, (uint32_t)(val >> 32));
444 avio_wb32(s, (uint32_t)(val & 0xffffffff));
447 void avio_wl16(AVIOContext *s, unsigned int val)
449 avio_w8(s, (uint8_t)val);
450 avio_w8(s, (int)val >> 8);
453 void avio_wb16(AVIOContext *s, unsigned int val)
455 avio_w8(s, (int)val >> 8);
456 avio_w8(s, (uint8_t)val);
459 void avio_wl24(AVIOContext *s, unsigned int val)
461 avio_wl16(s, val & 0xffff);
462 avio_w8(s, (int)val >> 16);
465 void avio_wb24(AVIOContext *s, unsigned int val)
467 avio_wb16(s, (int)val >> 8);
468 avio_w8(s, (uint8_t)val);
471 void avio_write_marker(AVIOContext *s, int64_t time, enum AVIODataMarkerType type)
473 if (type == AVIO_DATA_MARKER_FLUSH_POINT) {
474 if (s->buf_ptr - s->buffer >= s->min_packet_size)
478 if (!s->write_data_type)
480 // If ignoring boundary points, just treat it as unknown
481 if (type == AVIO_DATA_MARKER_BOUNDARY_POINT && s->ignore_boundary_point)
482 type = AVIO_DATA_MARKER_UNKNOWN;
483 // Avoid unnecessary flushes if we are already in non-header/trailer
484 // data and setting the type to unknown
485 if (type == AVIO_DATA_MARKER_UNKNOWN &&
486 (s->current_type != AVIO_DATA_MARKER_HEADER &&
487 s->current_type != AVIO_DATA_MARKER_TRAILER))
491 case AVIO_DATA_MARKER_HEADER:
492 case AVIO_DATA_MARKER_TRAILER:
493 // For header/trailer, ignore a new marker of the same type;
494 // consecutive header/trailer markers can be merged.
495 if (type == s->current_type)
500 // If we've reached here, we have a new, noteworthy marker.
501 // Flush the previous data and mark the start of the new data.
503 s->current_type = type;
507 static int read_packet_wrapper(AVIOContext *s, uint8_t *buf, int size)
512 return AVERROR(EINVAL);
513 ret = s->read_packet(s->opaque, buf, size);
514 #if FF_API_OLD_AVIO_EOF_0
515 if (!ret && !s->max_packet_size) {
516 av_log(NULL, AV_LOG_WARNING, "Invalid return value 0 for stream protocol\n");
520 av_assert2(ret || s->max_packet_size);
527 static void fill_buffer(AVIOContext *s)
529 int max_buffer_size = s->max_packet_size ?
530 s->max_packet_size : IO_BUFFER_SIZE;
531 uint8_t *dst = s->buf_end - s->buffer + max_buffer_size < s->buffer_size ?
532 s->buf_end : s->buffer;
533 int len = s->buffer_size - (dst - s->buffer);
535 /* can't fill the buffer without read_packet, just set EOF if appropriate */
536 if (!s->read_packet && s->buf_ptr >= s->buf_end)
539 /* no need to do anything if EOF already reached */
543 if (s->update_checksum && dst == s->buffer) {
544 if (s->buf_end > s->checksum_ptr)
545 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
546 s->buf_end - s->checksum_ptr);
547 s->checksum_ptr = s->buffer;
550 /* make buffer smaller in case it ended up large after probing */
551 if (s->read_packet && s->orig_buffer_size && s->buffer_size > s->orig_buffer_size && len >= s->orig_buffer_size) {
552 if (dst == s->buffer && s->buf_ptr != dst) {
553 int ret = ffio_set_buf_size(s, s->orig_buffer_size);
555 av_log(s, AV_LOG_WARNING, "Failed to decrease buffer size\n");
557 s->checksum_ptr = dst = s->buffer;
559 len = s->orig_buffer_size;
562 len = read_packet_wrapper(s, dst, len);
563 if (len == AVERROR_EOF) {
564 /* do not modify buffer if EOF reached so that a seek back can
565 be done without rereading data */
567 } else if (len < 0) {
573 s->buf_end = dst + len;
574 s->bytes_read += len;
578 unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
581 return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
584 unsigned long ff_crcEDB88320_update(unsigned long checksum, const uint8_t *buf,
587 return av_crc(av_crc_get_table(AV_CRC_32_IEEE_LE), checksum, buf, len);
590 unsigned long ff_crcA001_update(unsigned long checksum, const uint8_t *buf,
593 return av_crc(av_crc_get_table(AV_CRC_16_ANSI_LE), checksum, buf, len);
596 unsigned long ffio_get_checksum(AVIOContext *s)
598 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
599 s->buf_ptr - s->checksum_ptr);
600 s->update_checksum = NULL;
604 void ffio_init_checksum(AVIOContext *s,
605 unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
606 unsigned long checksum)
608 s->update_checksum = update_checksum;
609 if (s->update_checksum) {
610 s->checksum = checksum;
611 s->checksum_ptr = s->buf_ptr;
615 /* XXX: put an inline version */
616 int avio_r8(AVIOContext *s)
618 if (s->buf_ptr >= s->buf_end)
620 if (s->buf_ptr < s->buf_end)
621 return *s->buf_ptr++;
625 int avio_read(AVIOContext *s, unsigned char *buf, int size)
631 len = FFMIN(s->buf_end - s->buf_ptr, size);
632 if (len == 0 || s->write_flag) {
633 if((s->direct || size > s->buffer_size) && !s->update_checksum) {
634 // bypass the buffer and read data directly into buf
635 len = read_packet_wrapper(s, buf, size);
636 if (len == AVERROR_EOF) {
637 /* do not modify buffer if EOF reached so that a seek back can
638 be done without rereading data */
641 } else if (len < 0) {
647 s->bytes_read += len;
651 s->buf_ptr = s->buffer;
652 s->buf_end = s->buffer/* + len*/;
656 len = s->buf_end - s->buf_ptr;
661 memcpy(buf, s->buf_ptr, len);
668 if (s->error) return s->error;
669 if (avio_feof(s)) return AVERROR_EOF;
674 int ffio_read_size(AVIOContext *s, unsigned char *buf, int size)
676 int ret = avio_read(s, buf, size);
678 return AVERROR_INVALIDDATA;
682 int ffio_read_indirect(AVIOContext *s, unsigned char *buf, int size, const unsigned char **data)
684 if (s->buf_end - s->buf_ptr >= size && !s->write_flag) {
690 return avio_read(s, buf, size);
694 int avio_read_partial(AVIOContext *s, unsigned char *buf, int size)
701 if (s->read_packet && s->write_flag) {
702 len = read_packet_wrapper(s, buf, size);
708 len = s->buf_end - s->buf_ptr;
710 /* Reset the buf_end pointer to the start of the buffer, to make sure
711 * the fill_buffer call tries to read as much data as fits into the
712 * full buffer, instead of just what space is left after buf_end.
713 * This avoids returning partial packets at the end of the buffer,
714 * for packet based inputs.
716 s->buf_end = s->buf_ptr = s->buffer;
718 len = s->buf_end - s->buf_ptr;
722 memcpy(buf, s->buf_ptr, len);
725 if (s->error) return s->error;
726 if (avio_feof(s)) return AVERROR_EOF;
731 unsigned int avio_rl16(AVIOContext *s)
735 val |= avio_r8(s) << 8;
739 unsigned int avio_rl24(AVIOContext *s)
743 val |= avio_r8(s) << 16;
747 unsigned int avio_rl32(AVIOContext *s)
751 val |= avio_rl16(s) << 16;
755 uint64_t avio_rl64(AVIOContext *s)
758 val = (uint64_t)avio_rl32(s);
759 val |= (uint64_t)avio_rl32(s) << 32;
763 unsigned int avio_rb16(AVIOContext *s)
766 val = avio_r8(s) << 8;
771 unsigned int avio_rb24(AVIOContext *s)
774 val = avio_rb16(s) << 8;
778 unsigned int avio_rb32(AVIOContext *s)
781 val = avio_rb16(s) << 16;
786 int ff_get_line(AVIOContext *s, char *buf, int maxlen)
793 if (c && i < maxlen-1)
795 } while (c != '\n' && c != '\r' && c);
796 if (c == '\r' && avio_r8(s) != '\n' && !avio_feof(s))
803 int ff_get_chomp_line(AVIOContext *s, char *buf, int maxlen)
805 int len = ff_get_line(s, buf, maxlen);
806 while (len > 0 && av_isspace(buf[len - 1]))
811 int64_t ff_read_line_to_bprint(AVIOContext *s, AVBPrint *bp)
822 end = (c == '\r' || c == '\n' || c == '\0');
825 } while (!end && len < sizeof(tmp));
826 av_bprint_append_data(bp, tmp, len);
830 if (c == '\r' && avio_r8(s) != '\n' && !avio_feof(s))
836 if (!c && !read && avio_feof(s))
842 int64_t ff_read_line_to_bprint_overwrite(AVIOContext *s, AVBPrint *bp)
847 ret = ff_read_line_to_bprint(s, bp);
851 if (!av_bprint_is_complete(bp))
852 return AVERROR(ENOMEM);
857 int avio_get_str(AVIOContext *s, int maxlen, char *buf, int buflen)
862 return AVERROR(EINVAL);
863 // reserve 1 byte for terminating 0
864 buflen = FFMIN(buflen - 1, maxlen);
865 for (i = 0; i < buflen; i++)
866 if (!(buf[i] = avio_r8(s)))
869 for (; i < maxlen; i++)
875 #define GET_STR16(type, read) \
876 int avio_get_str16 ##type(AVIOContext *pb, int maxlen, char *buf, int buflen)\
881 return AVERROR(EINVAL); \
882 while (ret + 1 < maxlen) {\
885 GET_UTF16(ch, (ret += 2) <= maxlen ? read(pb) : 0, break;)\
888 PUT_UTF8(ch, tmp, if (q - buf < buflen - 1) *q++ = tmp;)\
894 GET_STR16(le, avio_rl16)
895 GET_STR16(be, avio_rb16)
899 uint64_t avio_rb64(AVIOContext *s)
902 val = (uint64_t)avio_rb32(s) << 32;
903 val |= (uint64_t)avio_rb32(s);
907 uint64_t ffio_read_varlen(AVIOContext *bc){
913 val= (val<<7) + (tmp&127);
918 int ffio_fdopen(AVIOContext **s, URLContext *h)
920 uint8_t *buffer = NULL;
921 int buffer_size, max_packet_size;
923 max_packet_size = h->max_packet_size;
924 if (max_packet_size) {
925 buffer_size = max_packet_size; /* no need to bufferize more than one packet */
927 buffer_size = IO_BUFFER_SIZE;
929 buffer = av_malloc(buffer_size);
931 return AVERROR(ENOMEM);
933 *s = avio_alloc_context(buffer, buffer_size, h->flags & AVIO_FLAG_WRITE, h,
934 (int (*)(void *, uint8_t *, int)) ffurl_read,
935 (int (*)(void *, uint8_t *, int)) ffurl_write,
936 (int64_t (*)(void *, int64_t, int))ffurl_seek);
940 (*s)->protocol_whitelist = av_strdup(h->protocol_whitelist);
941 if (!(*s)->protocol_whitelist && h->protocol_whitelist) {
945 (*s)->protocol_blacklist = av_strdup(h->protocol_blacklist);
946 if (!(*s)->protocol_blacklist && h->protocol_blacklist) {
950 (*s)->direct = h->flags & AVIO_FLAG_DIRECT;
952 (*s)->seekable = h->is_streamed ? 0 : AVIO_SEEKABLE_NORMAL;
953 (*s)->max_packet_size = max_packet_size;
954 (*s)->min_packet_size = h->min_packet_size;
956 (*s)->read_pause = (int (*)(void *, int))h->prot->url_read_pause;
958 (int64_t (*)(void *, int, int64_t, int))h->prot->url_read_seek;
960 if (h->prot->url_read_seek)
961 (*s)->seekable |= AVIO_SEEKABLE_TIME;
963 (*s)->short_seek_get = (int (*)(void *))ffurl_get_short_seek;
964 (*s)->av_class = &ff_avio_class;
968 return AVERROR(ENOMEM);
971 URLContext* ffio_geturlcontext(AVIOContext *s)
976 if (s->opaque && s->read_packet == (int (*)(void *, uint8_t *, int))ffurl_read)
982 int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size)
985 int max_buffer_size = s->max_packet_size ?
986 s->max_packet_size : IO_BUFFER_SIZE;
987 int filled = s->buf_end - s->buffer;
988 ptrdiff_t checksum_ptr_offset = s->checksum_ptr ? s->checksum_ptr - s->buffer : -1;
990 buf_size += s->buf_ptr - s->buffer + max_buffer_size;
992 if (buf_size < filled || s->seekable || !s->read_packet)
994 av_assert0(!s->write_flag);
996 buffer = av_malloc(buf_size);
998 return AVERROR(ENOMEM);
1000 memcpy(buffer, s->buffer, filled);
1002 s->buf_ptr = buffer + (s->buf_ptr - s->buffer);
1003 s->buf_end = buffer + (s->buf_end - s->buffer);
1005 s->buffer_size = buf_size;
1006 if (checksum_ptr_offset >= 0)
1007 s->checksum_ptr = s->buffer + checksum_ptr_offset;
1011 int ffio_set_buf_size(AVIOContext *s, int buf_size)
1014 buffer = av_malloc(buf_size);
1016 return AVERROR(ENOMEM);
1020 s->orig_buffer_size =
1021 s->buffer_size = buf_size;
1022 s->buf_ptr = s->buf_ptr_max = buffer;
1023 url_resetbuf(s, s->write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ);
1027 int ffio_realloc_buf(AVIOContext *s, int buf_size)
1032 if (!s->buffer_size)
1033 return ffio_set_buf_size(s, buf_size);
1035 if (buf_size <= s->buffer_size)
1038 buffer = av_malloc(buf_size);
1040 return AVERROR(ENOMEM);
1042 data_size = s->write_flag ? (s->buf_ptr - s->buffer) : (s->buf_end - s->buf_ptr);
1044 memcpy(buffer, s->write_flag ? s->buffer : s->buf_ptr, data_size);
1047 s->orig_buffer_size = buf_size;
1048 s->buffer_size = buf_size;
1049 s->buf_ptr = s->write_flag ? (s->buffer + data_size) : s->buffer;
1051 s->buf_ptr_max = s->buffer + data_size;
1053 s->buf_end = s->write_flag ? (s->buffer + s->buffer_size) : (s->buf_ptr + data_size);
1058 static int url_resetbuf(AVIOContext *s, int flags)
1060 av_assert1(flags == AVIO_FLAG_WRITE || flags == AVIO_FLAG_READ);
1062 if (flags & AVIO_FLAG_WRITE) {
1063 s->buf_end = s->buffer + s->buffer_size;
1066 s->buf_end = s->buffer;
1072 int ffio_rewind_with_probe_data(AVIOContext *s, unsigned char **bufp, int buf_size)
1074 int64_t buffer_start;
1076 int overlap, new_size, alloc_size;
1077 uint8_t *buf = *bufp;
1079 if (s->write_flag) {
1081 return AVERROR(EINVAL);
1084 buffer_size = s->buf_end - s->buffer;
1086 /* the buffers must touch or overlap */
1087 if ((buffer_start = s->pos - buffer_size) > buf_size) {
1089 return AVERROR(EINVAL);
1092 overlap = buf_size - buffer_start;
1093 new_size = buf_size + buffer_size - overlap;
1095 alloc_size = FFMAX(s->buffer_size, new_size);
1096 if (alloc_size > buf_size)
1097 if (!(buf = (*bufp) = av_realloc_f(buf, 1, alloc_size)))
1098 return AVERROR(ENOMEM);
1100 if (new_size > buf_size) {
1101 memcpy(buf + buf_size, s->buffer + overlap, buffer_size - overlap);
1102 buf_size = new_size;
1106 s->buf_ptr = s->buffer = buf;
1107 s->buffer_size = alloc_size;
1109 s->buf_end = s->buf_ptr + buf_size;
1115 int avio_open(AVIOContext **s, const char *filename, int flags)
1117 return avio_open2(s, filename, flags, NULL, NULL);
1120 int ffio_open_whitelist(AVIOContext **s, const char *filename, int flags,
1121 const AVIOInterruptCB *int_cb, AVDictionary **options,
1122 const char *whitelist, const char *blacklist
1130 err = ffurl_open_whitelist(&h, filename, flags, int_cb, options, whitelist, blacklist, NULL);
1133 err = ffio_fdopen(s, h);
1141 int avio_open2(AVIOContext **s, const char *filename, int flags,
1142 const AVIOInterruptCB *int_cb, AVDictionary **options)
1144 return ffio_open_whitelist(s, filename, flags, int_cb, options, NULL, NULL);
1147 int avio_close(AVIOContext *s)
1158 av_freep(&s->buffer);
1160 av_log(s, AV_LOG_VERBOSE, "Statistics: %d seeks, %d writeouts\n", s->seek_count, s->writeout_count);
1162 av_log(s, AV_LOG_VERBOSE, "Statistics: %"PRId64" bytes read, %d seeks\n", s->bytes_read, s->seek_count);
1165 avio_context_free(&s);
1167 return ffurl_close(h);
1170 int avio_closep(AVIOContext **s)
1172 int ret = avio_close(*s);
1177 int avio_printf(AVIOContext *s, const char *fmt, ...)
1182 av_bprint_init(&bp, 0, INT_MAX);
1184 av_vbprintf(&bp, fmt, ap);
1186 if (!av_bprint_is_complete(&bp)) {
1187 av_bprint_finalize(&bp, NULL);
1188 s->error = AVERROR(ENOMEM);
1189 return AVERROR(ENOMEM);
1191 avio_write(s, bp.str, bp.len);
1192 av_bprint_finalize(&bp, NULL);
1196 void avio_print_string_array(AVIOContext *s, const char *strings[])
1198 for(; *strings; strings++)
1199 avio_write(s, (const unsigned char *)*strings, strlen(*strings));
1202 int avio_pause(AVIOContext *s, int pause)
1205 return AVERROR(ENOSYS);
1206 return s->read_pause(s->opaque, pause);
1209 int64_t avio_seek_time(AVIOContext *s, int stream_index,
1210 int64_t timestamp, int flags)
1214 return AVERROR(ENOSYS);
1215 ret = s->read_seek(s->opaque, stream_index, timestamp, flags);
1218 s->buf_ptr = s->buf_end; // Flush buffer
1219 pos = s->seek(s->opaque, 0, SEEK_CUR);
1222 else if (pos != AVERROR(ENOSYS))
1228 int avio_read_to_bprint(AVIOContext *h, AVBPrint *pb, size_t max_size)
1233 ret = avio_read(h, buf, FFMIN(max_size, sizeof(buf)));
1234 if (ret == AVERROR_EOF)
1238 av_bprint_append_data(pb, buf, ret);
1239 if (!av_bprint_is_complete(pb))
1240 return AVERROR(ENOMEM);
1246 int avio_accept(AVIOContext *s, AVIOContext **c)
1249 URLContext *sc = s->opaque;
1250 URLContext *cc = NULL;
1251 ret = ffurl_accept(sc, &cc);
1254 return ffio_fdopen(c, cc);
1257 int avio_handshake(AVIOContext *c)
1259 URLContext *cc = c->opaque;
1260 return ffurl_handshake(cc);
1263 /* output in a dynamic buffer */
1265 typedef struct DynBuffer {
1266 int pos, size, allocated_size;
1269 uint8_t io_buffer[1];
1272 static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
1274 DynBuffer *d = opaque;
1275 unsigned new_size, new_allocated_size;
1277 /* reallocate buffer if needed */
1278 new_size = d->pos + buf_size;
1279 new_allocated_size = d->allocated_size;
1280 if (new_size < d->pos || new_size > INT_MAX/2)
1282 while (new_size > new_allocated_size) {
1283 if (!new_allocated_size)
1284 new_allocated_size = new_size;
1286 new_allocated_size += new_allocated_size / 2 + 1;
1289 if (new_allocated_size > d->allocated_size) {
1291 if ((err = av_reallocp(&d->buffer, new_allocated_size)) < 0) {
1292 d->allocated_size = 0;
1296 d->allocated_size = new_allocated_size;
1298 memcpy(d->buffer + d->pos, buf, buf_size);
1300 if (d->pos > d->size)
1305 static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
1307 unsigned char buf1[4];
1310 /* packetized write: output the header */
1311 AV_WB32(buf1, buf_size);
1312 ret = dyn_buf_write(opaque, buf1, 4);
1317 return dyn_buf_write(opaque, buf, buf_size);
1320 static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence)
1322 DynBuffer *d = opaque;
1324 if (whence == SEEK_CUR)
1326 else if (whence == SEEK_END)
1328 if (offset < 0 || offset > 0x7fffffffLL)
1334 static int url_open_dyn_buf_internal(AVIOContext **s, int max_packet_size)
1337 unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024;
1339 if (sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
1341 d = av_mallocz(sizeof(DynBuffer) + io_buffer_size);
1343 return AVERROR(ENOMEM);
1344 d->io_buffer_size = io_buffer_size;
1345 *s = avio_alloc_context(d->io_buffer, d->io_buffer_size, 1, d, NULL,
1346 max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
1347 max_packet_size ? NULL : dyn_buf_seek);
1350 return AVERROR(ENOMEM);
1352 (*s)->max_packet_size = max_packet_size;
1356 int avio_open_dyn_buf(AVIOContext **s)
1358 return url_open_dyn_buf_internal(s, 0);
1361 int ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size)
1363 if (max_packet_size <= 0)
1365 return url_open_dyn_buf_internal(s, max_packet_size);
1368 int avio_get_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
1372 if (!s || s->error) {
1379 *pbuffer = d->io_buffer;
1380 return FFMAX(s->buf_ptr, s->buf_ptr_max) - s->buffer;
1385 *pbuffer = d->buffer;
1390 void ffio_reset_dyn_buf(AVIOContext *s)
1392 DynBuffer *d = s->opaque;
1393 int max_packet_size = s->max_packet_size;
1395 ffio_init_context(s, d->io_buffer, d->io_buffer_size, 1, d, NULL,
1396 s->write_packet, s->seek);
1397 s->max_packet_size = max_packet_size;
1398 d->pos = d->size = 0;
1401 int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
1405 static const char padbuf[AV_INPUT_BUFFER_PADDING_SIZE] = {0};
1413 /* don't attempt to pad fixed-size packet buffers */
1414 if (!s->max_packet_size) {
1415 avio_write(s, padbuf, sizeof(padbuf));
1416 padding = AV_INPUT_BUFFER_PADDING_SIZE;
1422 *pbuffer = d->buffer;
1426 avio_context_free(&s);
1428 return size - padding;
1431 void ffio_free_dyn_buf(AVIOContext **s)
1441 avio_context_free(s);
1444 static int null_buf_write(void *opaque, uint8_t *buf, int buf_size)
1446 DynBuffer *d = opaque;
1449 if (d->pos > d->size)
1454 int ffio_open_null_buf(AVIOContext **s)
1456 int ret = url_open_dyn_buf_internal(s, 0);
1458 AVIOContext *pb = *s;
1459 pb->write_packet = null_buf_write;
1464 int ffio_close_null_buf(AVIOContext *s)
1466 DynBuffer *d = s->opaque;
1474 avio_context_free(&s);