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 #if FF_API_CHILD_CLASS_NEXT
52 static const AVClass *ff_avio_child_class_next(const AVClass *prev)
54 return prev ? NULL : &ffurl_context_class;
58 static const AVClass *child_class_iterate(void **iter)
60 const AVClass *c = *iter ? NULL : &ffurl_context_class;
61 *iter = (void*)(uintptr_t)c;
65 #define OFFSET(x) offsetof(AVIOContext,x)
66 #define E AV_OPT_FLAG_ENCODING_PARAM
67 #define D AV_OPT_FLAG_DECODING_PARAM
68 static const AVOption ff_avio_options[] = {
69 {"protocol_whitelist", "List of protocols that are allowed to be used", OFFSET(protocol_whitelist), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, D },
73 const AVClass ff_avio_class = {
74 .class_name = "AVIOContext",
75 .item_name = av_default_item_name,
76 .version = LIBAVUTIL_VERSION_INT,
77 .option = ff_avio_options,
78 .child_next = ff_avio_child_next,
79 #if FF_API_CHILD_CLASS_NEXT
80 .child_class_next = ff_avio_child_class_next,
82 .child_class_iterate = child_class_iterate,
85 static void fill_buffer(AVIOContext *s);
86 static int url_resetbuf(AVIOContext *s, int flags);
88 int ffio_init_context(AVIOContext *s,
89 unsigned char *buffer,
93 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
94 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
95 int64_t (*seek)(void *opaque, int64_t offset, int whence))
97 memset(s, 0, sizeof(AVIOContext));
100 s->orig_buffer_size =
101 s->buffer_size = buffer_size;
103 s->buf_ptr_max = buffer;
107 url_resetbuf(s, write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ);
109 s->write_packet = write_packet;
110 s->read_packet = read_packet;
115 s->seekable = seek ? AVIO_SEEKABLE_NORMAL : 0;
116 s->min_packet_size = 0;
117 s->max_packet_size = 0;
118 s->update_checksum = NULL;
119 s->short_seek_threshold = SHORT_SEEK_THRESHOLD;
121 if (!read_packet && !write_flag) {
122 s->pos = buffer_size;
123 s->buf_end = s->buffer + buffer_size;
125 s->read_pause = NULL;
128 s->write_data_type = NULL;
129 s->ignore_boundary_point = 0;
130 s->current_type = AVIO_DATA_MARKER_UNKNOWN;
131 s->last_time = AV_NOPTS_VALUE;
132 s->short_seek_get = NULL;
138 AVIOContext *avio_alloc_context(
139 unsigned char *buffer,
143 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
144 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
145 int64_t (*seek)(void *opaque, int64_t offset, int whence))
147 AVIOContext *s = av_malloc(sizeof(AVIOContext));
150 ffio_init_context(s, buffer, buffer_size, write_flag, opaque,
151 read_packet, write_packet, seek);
155 void avio_context_free(AVIOContext **ps)
160 static void writeout(AVIOContext *s, const uint8_t *data, int len)
164 if (s->write_data_type)
165 ret = s->write_data_type(s->opaque, (uint8_t *)data,
169 else if (s->write_packet)
170 ret = s->write_packet(s->opaque, (uint8_t *)data, len);
174 if (s->pos + len > s->written)
175 s->written = s->pos + len;
178 if (s->current_type == AVIO_DATA_MARKER_SYNC_POINT ||
179 s->current_type == AVIO_DATA_MARKER_BOUNDARY_POINT) {
180 s->current_type = AVIO_DATA_MARKER_UNKNOWN;
182 s->last_time = AV_NOPTS_VALUE;
183 s->writeout_count ++;
187 static void flush_buffer(AVIOContext *s)
189 s->buf_ptr_max = FFMAX(s->buf_ptr, s->buf_ptr_max);
190 if (s->write_flag && s->buf_ptr_max > s->buffer) {
191 writeout(s, s->buffer, s->buf_ptr_max - s->buffer);
192 if (s->update_checksum) {
193 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
194 s->buf_ptr_max - s->checksum_ptr);
195 s->checksum_ptr = s->buffer;
198 s->buf_ptr = s->buf_ptr_max = s->buffer;
200 s->buf_end = s->buffer;
203 void avio_w8(AVIOContext *s, int b)
205 av_assert2(b>=-128 && b<=255);
207 if (s->buf_ptr >= s->buf_end)
211 void ffio_fill(AVIOContext *s, int b, int count)
214 int len = FFMIN(s->buf_end - s->buf_ptr, count);
215 memset(s->buf_ptr, b, len);
218 if (s->buf_ptr >= s->buf_end)
225 void avio_write(AVIOContext *s, const unsigned char *buf, int size)
227 if (s->direct && !s->update_checksum) {
229 writeout(s, buf, size);
233 int len = FFMIN(s->buf_end - s->buf_ptr, size);
234 memcpy(s->buf_ptr, buf, len);
237 if (s->buf_ptr >= s->buf_end)
245 void avio_flush(AVIOContext *s)
247 int seekback = s->write_flag ? FFMIN(0, s->buf_ptr - s->buf_ptr_max) : 0;
250 avio_seek(s, seekback, SEEK_CUR);
253 int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
257 int force = whence & AVSEEK_FORCE;
260 whence &= ~AVSEEK_FORCE;
263 return AVERROR(EINVAL);
265 if ((whence & AVSEEK_SIZE))
266 return s->seek ? s->seek(s->opaque, offset, AVSEEK_SIZE) : AVERROR(ENOSYS);
268 buffer_size = s->buf_end - s->buffer;
269 // pos is the absolute position that the beginning of s->buffer corresponds to in the file
270 pos = s->pos - (s->write_flag ? 0 : buffer_size);
272 if (whence != SEEK_CUR && whence != SEEK_SET)
273 return AVERROR(EINVAL);
275 if (whence == SEEK_CUR) {
276 offset1 = pos + (s->buf_ptr - s->buffer);
279 if (offset > INT64_MAX - offset1)
280 return AVERROR(EINVAL);
284 return AVERROR(EINVAL);
286 if (s->short_seek_get) {
287 short_seek = s->short_seek_get(s->opaque);
288 /* fallback to default short seek */
290 short_seek = s->short_seek_threshold;
292 short_seek = s->short_seek_threshold;
294 offset1 = offset - pos; // "offset1" is the relative offset from the beginning of s->buffer
295 s->buf_ptr_max = FFMAX(s->buf_ptr_max, s->buf_ptr);
296 if ((!s->direct || !s->seek) &&
297 offset1 >= 0 && offset1 <= (s->write_flag ? s->buf_ptr_max - s->buffer : buffer_size)) {
298 /* can do the seek inside the buffer */
299 s->buf_ptr = s->buffer + offset1;
300 } else if ((!(s->seekable & AVIO_SEEKABLE_NORMAL) ||
301 offset1 <= buffer_size + short_seek) &&
302 !s->write_flag && offset1 >= 0 &&
303 (!s->direct || !s->seek) &&
304 (whence != SEEK_END || force)) {
305 while(s->pos < offset && !s->eof_reached)
309 s->buf_ptr = s->buf_end - (s->pos - offset);
310 } else if(!s->write_flag && offset1 < 0 && -offset1 < buffer_size>>1 && s->seek && offset > 0) {
313 pos -= FFMIN(buffer_size>>1, pos);
314 if ((res = s->seek(s->opaque, pos, SEEK_SET)) < 0)
317 s->buf_ptr = s->buffer;
321 return avio_seek(s, offset, SEEK_SET | force);
328 return AVERROR(EPIPE);
329 if ((res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
333 s->buf_end = s->buffer;
334 s->buf_ptr = s->buf_ptr_max = s->buffer;
341 int64_t avio_skip(AVIOContext *s, int64_t offset)
343 return avio_seek(s, offset, SEEK_CUR);
346 int64_t avio_size(AVIOContext *s)
351 return AVERROR(EINVAL);
357 return AVERROR(ENOSYS);
358 size = s->seek(s->opaque, 0, AVSEEK_SIZE);
360 if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
363 s->seek(s->opaque, s->pos, SEEK_SET);
368 int avio_feof(AVIOContext *s)
376 return s->eof_reached;
379 void avio_wl32(AVIOContext *s, unsigned int val)
381 avio_w8(s, (uint8_t) val );
382 avio_w8(s, (uint8_t)(val >> 8 ));
383 avio_w8(s, (uint8_t)(val >> 16));
384 avio_w8(s, val >> 24 );
387 void avio_wb32(AVIOContext *s, unsigned int val)
389 avio_w8(s, val >> 24 );
390 avio_w8(s, (uint8_t)(val >> 16));
391 avio_w8(s, (uint8_t)(val >> 8 ));
392 avio_w8(s, (uint8_t) val );
395 int avio_put_str(AVIOContext *s, const char *str)
400 avio_write(s, (const unsigned char *) str, len);
406 static inline int put_str16(AVIOContext *s, const char *str, const int be)
408 const uint8_t *q = str;
416 GET_UTF8(ch, *q++, goto invalid;)
417 PUT_UTF16(ch, tmp, be ? avio_wb16(s, tmp) : avio_wl16(s, tmp);
421 av_log(s, AV_LOG_ERROR, "Invalid UTF8 sequence in avio_put_str16%s\n", be ? "be" : "le");
422 err = AVERROR(EINVAL);
436 #define PUT_STR16(type, big_endian) \
437 int avio_put_str16 ## type(AVIOContext *s, const char *str) \
439 return put_str16(s, str, big_endian); \
447 void avio_wl64(AVIOContext *s, uint64_t val)
449 avio_wl32(s, (uint32_t)(val & 0xffffffff));
450 avio_wl32(s, (uint32_t)(val >> 32));
453 void avio_wb64(AVIOContext *s, uint64_t val)
455 avio_wb32(s, (uint32_t)(val >> 32));
456 avio_wb32(s, (uint32_t)(val & 0xffffffff));
459 void avio_wl16(AVIOContext *s, unsigned int val)
461 avio_w8(s, (uint8_t)val);
462 avio_w8(s, (int)val >> 8);
465 void avio_wb16(AVIOContext *s, unsigned int val)
467 avio_w8(s, (int)val >> 8);
468 avio_w8(s, (uint8_t)val);
471 void avio_wl24(AVIOContext *s, unsigned int val)
473 avio_wl16(s, val & 0xffff);
474 avio_w8(s, (int)val >> 16);
477 void avio_wb24(AVIOContext *s, unsigned int val)
479 avio_wb16(s, (int)val >> 8);
480 avio_w8(s, (uint8_t)val);
483 void avio_write_marker(AVIOContext *s, int64_t time, enum AVIODataMarkerType type)
485 if (type == AVIO_DATA_MARKER_FLUSH_POINT) {
486 if (s->buf_ptr - s->buffer >= s->min_packet_size)
490 if (!s->write_data_type)
492 // If ignoring boundary points, just treat it as unknown
493 if (type == AVIO_DATA_MARKER_BOUNDARY_POINT && s->ignore_boundary_point)
494 type = AVIO_DATA_MARKER_UNKNOWN;
495 // Avoid unnecessary flushes if we are already in non-header/trailer
496 // data and setting the type to unknown
497 if (type == AVIO_DATA_MARKER_UNKNOWN &&
498 (s->current_type != AVIO_DATA_MARKER_HEADER &&
499 s->current_type != AVIO_DATA_MARKER_TRAILER))
503 case AVIO_DATA_MARKER_HEADER:
504 case AVIO_DATA_MARKER_TRAILER:
505 // For header/trailer, ignore a new marker of the same type;
506 // consecutive header/trailer markers can be merged.
507 if (type == s->current_type)
512 // If we've reached here, we have a new, noteworthy marker.
513 // Flush the previous data and mark the start of the new data.
515 s->current_type = type;
519 static int read_packet_wrapper(AVIOContext *s, uint8_t *buf, int size)
524 return AVERROR(EINVAL);
525 ret = s->read_packet(s->opaque, buf, size);
526 #if FF_API_OLD_AVIO_EOF_0
527 if (!ret && !s->max_packet_size) {
528 av_log(NULL, AV_LOG_WARNING, "Invalid return value 0 for stream protocol\n");
532 av_assert2(ret || s->max_packet_size);
539 static void fill_buffer(AVIOContext *s)
541 int max_buffer_size = s->max_packet_size ?
542 s->max_packet_size : IO_BUFFER_SIZE;
543 uint8_t *dst = s->buf_end - s->buffer + max_buffer_size <= s->buffer_size ?
544 s->buf_end : s->buffer;
545 int len = s->buffer_size - (dst - s->buffer);
547 /* can't fill the buffer without read_packet, just set EOF if appropriate */
548 if (!s->read_packet && s->buf_ptr >= s->buf_end)
551 /* no need to do anything if EOF already reached */
555 if (s->update_checksum && dst == s->buffer) {
556 if (s->buf_end > s->checksum_ptr)
557 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
558 s->buf_end - s->checksum_ptr);
559 s->checksum_ptr = s->buffer;
562 /* make buffer smaller in case it ended up large after probing */
563 if (s->read_packet && s->orig_buffer_size && s->buffer_size > s->orig_buffer_size && len >= s->orig_buffer_size) {
564 if (dst == s->buffer && s->buf_ptr != dst) {
565 int ret = ffio_set_buf_size(s, s->orig_buffer_size);
567 av_log(s, AV_LOG_WARNING, "Failed to decrease buffer size\n");
569 s->checksum_ptr = dst = s->buffer;
571 len = s->orig_buffer_size;
574 len = read_packet_wrapper(s, dst, len);
575 if (len == AVERROR_EOF) {
576 /* do not modify buffer if EOF reached so that a seek back can
577 be done without rereading data */
579 } else if (len < 0) {
585 s->buf_end = dst + len;
586 s->bytes_read += len;
590 unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
593 return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
596 unsigned long ff_crcEDB88320_update(unsigned long checksum, const uint8_t *buf,
599 return av_crc(av_crc_get_table(AV_CRC_32_IEEE_LE), checksum, buf, len);
602 unsigned long ff_crcA001_update(unsigned long checksum, const uint8_t *buf,
605 return av_crc(av_crc_get_table(AV_CRC_16_ANSI_LE), checksum, buf, len);
608 unsigned long ffio_get_checksum(AVIOContext *s)
610 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
611 s->buf_ptr - s->checksum_ptr);
612 s->update_checksum = NULL;
616 void ffio_init_checksum(AVIOContext *s,
617 unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
618 unsigned long checksum)
620 s->update_checksum = update_checksum;
621 if (s->update_checksum) {
622 s->checksum = checksum;
623 s->checksum_ptr = s->buf_ptr;
627 /* XXX: put an inline version */
628 int avio_r8(AVIOContext *s)
630 if (s->buf_ptr >= s->buf_end)
632 if (s->buf_ptr < s->buf_end)
633 return *s->buf_ptr++;
637 int avio_read(AVIOContext *s, unsigned char *buf, int size)
643 len = FFMIN(s->buf_end - s->buf_ptr, size);
644 if (len == 0 || s->write_flag) {
645 if((s->direct || size > s->buffer_size) && !s->update_checksum) {
646 // bypass the buffer and read data directly into buf
647 len = read_packet_wrapper(s, buf, size);
648 if (len == AVERROR_EOF) {
649 /* do not modify buffer if EOF reached so that a seek back can
650 be done without rereading data */
653 } else if (len < 0) {
659 s->bytes_read += len;
663 s->buf_ptr = s->buffer;
664 s->buf_end = s->buffer/* + len*/;
668 len = s->buf_end - s->buf_ptr;
673 memcpy(buf, s->buf_ptr, len);
680 if (s->error) return s->error;
681 if (avio_feof(s)) return AVERROR_EOF;
686 int ffio_read_size(AVIOContext *s, unsigned char *buf, int size)
688 int ret = avio_read(s, buf, size);
690 return AVERROR_INVALIDDATA;
694 int ffio_read_indirect(AVIOContext *s, unsigned char *buf, int size, const unsigned char **data)
696 if (s->buf_end - s->buf_ptr >= size && !s->write_flag) {
702 return avio_read(s, buf, size);
706 int avio_read_partial(AVIOContext *s, unsigned char *buf, int size)
711 return AVERROR(EINVAL);
713 if (s->read_packet && s->write_flag) {
714 len = read_packet_wrapper(s, buf, size);
720 len = s->buf_end - s->buf_ptr;
722 /* Reset the buf_end pointer to the start of the buffer, to make sure
723 * the fill_buffer call tries to read as much data as fits into the
724 * full buffer, instead of just what space is left after buf_end.
725 * This avoids returning partial packets at the end of the buffer,
726 * for packet based inputs.
728 s->buf_end = s->buf_ptr = s->buffer;
730 len = s->buf_end - s->buf_ptr;
734 memcpy(buf, s->buf_ptr, len);
737 if (s->error) return s->error;
738 if (avio_feof(s)) return AVERROR_EOF;
743 unsigned int avio_rl16(AVIOContext *s)
747 val |= avio_r8(s) << 8;
751 unsigned int avio_rl24(AVIOContext *s)
755 val |= avio_r8(s) << 16;
759 unsigned int avio_rl32(AVIOContext *s)
763 val |= avio_rl16(s) << 16;
767 uint64_t avio_rl64(AVIOContext *s)
770 val = (uint64_t)avio_rl32(s);
771 val |= (uint64_t)avio_rl32(s) << 32;
775 unsigned int avio_rb16(AVIOContext *s)
778 val = avio_r8(s) << 8;
783 unsigned int avio_rb24(AVIOContext *s)
786 val = avio_rb16(s) << 8;
790 unsigned int avio_rb32(AVIOContext *s)
793 val = avio_rb16(s) << 16;
798 int ff_get_line(AVIOContext *s, char *buf, int maxlen)
805 if (c && i < maxlen-1)
807 } while (c != '\n' && c != '\r' && c);
808 if (c == '\r' && avio_r8(s) != '\n' && !avio_feof(s))
815 int ff_get_chomp_line(AVIOContext *s, char *buf, int maxlen)
817 int len = ff_get_line(s, buf, maxlen);
818 while (len > 0 && av_isspace(buf[len - 1]))
823 int64_t ff_read_line_to_bprint(AVIOContext *s, AVBPrint *bp)
834 end = (c == '\r' || c == '\n' || c == '\0');
837 } while (!end && len < sizeof(tmp));
838 av_bprint_append_data(bp, tmp, len);
842 if (c == '\r' && avio_r8(s) != '\n' && !avio_feof(s))
848 if (!c && !read && avio_feof(s))
854 int64_t ff_read_line_to_bprint_overwrite(AVIOContext *s, AVBPrint *bp)
859 ret = ff_read_line_to_bprint(s, bp);
863 if (!av_bprint_is_complete(bp))
864 return AVERROR(ENOMEM);
869 int avio_get_str(AVIOContext *s, int maxlen, char *buf, int buflen)
874 return AVERROR(EINVAL);
875 // reserve 1 byte for terminating 0
876 buflen = FFMIN(buflen - 1, maxlen);
877 for (i = 0; i < buflen; i++)
878 if (!(buf[i] = avio_r8(s)))
881 for (; i < maxlen; i++)
887 #define GET_STR16(type, read) \
888 int avio_get_str16 ##type(AVIOContext *pb, int maxlen, char *buf, int buflen)\
893 return AVERROR(EINVAL); \
894 while (ret + 1 < maxlen) {\
897 GET_UTF16(ch, (ret += 2) <= maxlen ? read(pb) : 0, break;)\
900 PUT_UTF8(ch, tmp, if (q - buf < buflen - 1) *q++ = tmp;)\
906 GET_STR16(le, avio_rl16)
907 GET_STR16(be, avio_rb16)
911 uint64_t avio_rb64(AVIOContext *s)
914 val = (uint64_t)avio_rb32(s) << 32;
915 val |= (uint64_t)avio_rb32(s);
919 uint64_t ffio_read_varlen(AVIOContext *bc){
925 val= (val<<7) + (tmp&127);
930 int ffio_fdopen(AVIOContext **s, URLContext *h)
932 uint8_t *buffer = NULL;
933 int buffer_size, max_packet_size;
935 max_packet_size = h->max_packet_size;
936 if (max_packet_size) {
937 buffer_size = max_packet_size; /* no need to bufferize more than one packet */
939 buffer_size = IO_BUFFER_SIZE;
941 if (!(h->flags & AVIO_FLAG_WRITE) && h->is_streamed) {
942 if (buffer_size > INT_MAX/2)
943 return AVERROR(EINVAL);
946 buffer = av_malloc(buffer_size);
948 return AVERROR(ENOMEM);
950 *s = avio_alloc_context(buffer, buffer_size, h->flags & AVIO_FLAG_WRITE, h,
951 (int (*)(void *, uint8_t *, int)) ffurl_read,
952 (int (*)(void *, uint8_t *, int)) ffurl_write,
953 (int64_t (*)(void *, int64_t, int))ffurl_seek);
957 (*s)->protocol_whitelist = av_strdup(h->protocol_whitelist);
958 if (!(*s)->protocol_whitelist && h->protocol_whitelist) {
962 (*s)->protocol_blacklist = av_strdup(h->protocol_blacklist);
963 if (!(*s)->protocol_blacklist && h->protocol_blacklist) {
967 (*s)->direct = h->flags & AVIO_FLAG_DIRECT;
969 (*s)->seekable = h->is_streamed ? 0 : AVIO_SEEKABLE_NORMAL;
970 (*s)->max_packet_size = max_packet_size;
971 (*s)->min_packet_size = h->min_packet_size;
973 (*s)->read_pause = (int (*)(void *, int))h->prot->url_read_pause;
975 (int64_t (*)(void *, int, int64_t, int))h->prot->url_read_seek;
977 if (h->prot->url_read_seek)
978 (*s)->seekable |= AVIO_SEEKABLE_TIME;
980 (*s)->short_seek_get = (int (*)(void *))ffurl_get_short_seek;
981 (*s)->av_class = &ff_avio_class;
985 return AVERROR(ENOMEM);
988 URLContext* ffio_geturlcontext(AVIOContext *s)
993 if (s->opaque && s->read_packet == (int (*)(void *, uint8_t *, int))ffurl_read)
999 static void update_checksum(AVIOContext *s)
1001 if (s->update_checksum && s->buf_ptr > s->checksum_ptr) {
1002 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
1003 s->buf_ptr - s->checksum_ptr);
1007 int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size)
1010 int max_buffer_size = s->max_packet_size ?
1011 s->max_packet_size : IO_BUFFER_SIZE;
1012 ptrdiff_t filled = s->buf_end - s->buf_ptr;
1014 if (buf_size <= s->buf_end - s->buf_ptr)
1017 buf_size += max_buffer_size - 1;
1019 if (buf_size + s->buf_ptr - s->buffer <= s->buffer_size || s->seekable || !s->read_packet)
1021 av_assert0(!s->write_flag);
1023 if (buf_size <= s->buffer_size) {
1025 memmove(s->buffer, s->buf_ptr, filled);
1027 buffer = av_malloc(buf_size);
1029 return AVERROR(ENOMEM);
1031 memcpy(buffer, s->buf_ptr, filled);
1034 s->buffer_size = buf_size;
1036 s->buf_ptr = s->buffer;
1037 s->buf_end = s->buffer + filled;
1038 s->checksum_ptr = s->buffer;
1042 int ffio_set_buf_size(AVIOContext *s, int buf_size)
1045 buffer = av_malloc(buf_size);
1047 return AVERROR(ENOMEM);
1051 s->orig_buffer_size =
1052 s->buffer_size = buf_size;
1053 s->buf_ptr = s->buf_ptr_max = buffer;
1054 url_resetbuf(s, s->write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ);
1058 int ffio_realloc_buf(AVIOContext *s, int buf_size)
1063 if (!s->buffer_size)
1064 return ffio_set_buf_size(s, buf_size);
1066 if (buf_size <= s->buffer_size)
1069 buffer = av_malloc(buf_size);
1071 return AVERROR(ENOMEM);
1073 data_size = s->write_flag ? (s->buf_ptr - s->buffer) : (s->buf_end - s->buf_ptr);
1075 memcpy(buffer, s->write_flag ? s->buffer : s->buf_ptr, data_size);
1078 s->orig_buffer_size = buf_size;
1079 s->buffer_size = buf_size;
1080 s->buf_ptr = s->write_flag ? (s->buffer + data_size) : s->buffer;
1082 s->buf_ptr_max = s->buffer + data_size;
1084 s->buf_end = s->write_flag ? (s->buffer + s->buffer_size) : (s->buf_ptr + data_size);
1089 static int url_resetbuf(AVIOContext *s, int flags)
1091 av_assert1(flags == AVIO_FLAG_WRITE || flags == AVIO_FLAG_READ);
1093 if (flags & AVIO_FLAG_WRITE) {
1094 s->buf_end = s->buffer + s->buffer_size;
1097 s->buf_end = s->buffer;
1103 int ffio_rewind_with_probe_data(AVIOContext *s, unsigned char **bufp, int buf_size)
1105 int64_t buffer_start;
1107 int overlap, new_size, alloc_size;
1108 uint8_t *buf = *bufp;
1110 if (s->write_flag) {
1112 return AVERROR(EINVAL);
1115 buffer_size = s->buf_end - s->buffer;
1117 /* the buffers must touch or overlap */
1118 if ((buffer_start = s->pos - buffer_size) > buf_size) {
1120 return AVERROR(EINVAL);
1123 overlap = buf_size - buffer_start;
1124 new_size = buf_size + buffer_size - overlap;
1126 alloc_size = FFMAX(s->buffer_size, new_size);
1127 if (alloc_size > buf_size)
1128 if (!(buf = (*bufp) = av_realloc_f(buf, 1, alloc_size)))
1129 return AVERROR(ENOMEM);
1131 if (new_size > buf_size) {
1132 memcpy(buf + buf_size, s->buffer + overlap, buffer_size - overlap);
1133 buf_size = new_size;
1137 s->buf_ptr = s->buffer = buf;
1138 s->buffer_size = alloc_size;
1140 s->buf_end = s->buf_ptr + buf_size;
1146 int avio_open(AVIOContext **s, const char *filename, int flags)
1148 return avio_open2(s, filename, flags, NULL, NULL);
1151 int ffio_open_whitelist(AVIOContext **s, const char *filename, int flags,
1152 const AVIOInterruptCB *int_cb, AVDictionary **options,
1153 const char *whitelist, const char *blacklist
1161 err = ffurl_open_whitelist(&h, filename, flags, int_cb, options, whitelist, blacklist, NULL);
1164 err = ffio_fdopen(s, h);
1172 int avio_open2(AVIOContext **s, const char *filename, int flags,
1173 const AVIOInterruptCB *int_cb, AVDictionary **options)
1175 return ffio_open_whitelist(s, filename, flags, int_cb, options, NULL, NULL);
1178 int avio_close(AVIOContext *s)
1189 av_freep(&s->buffer);
1191 av_log(s, AV_LOG_VERBOSE, "Statistics: %d seeks, %d writeouts\n", s->seek_count, s->writeout_count);
1193 av_log(s, AV_LOG_VERBOSE, "Statistics: %"PRId64" bytes read, %d seeks\n", s->bytes_read, s->seek_count);
1196 avio_context_free(&s);
1198 return ffurl_close(h);
1201 int avio_closep(AVIOContext **s)
1203 int ret = avio_close(*s);
1208 int avio_printf(AVIOContext *s, const char *fmt, ...)
1213 av_bprint_init(&bp, 0, INT_MAX);
1215 av_vbprintf(&bp, fmt, ap);
1217 if (!av_bprint_is_complete(&bp)) {
1218 av_bprint_finalize(&bp, NULL);
1219 s->error = AVERROR(ENOMEM);
1220 return AVERROR(ENOMEM);
1222 avio_write(s, bp.str, bp.len);
1223 av_bprint_finalize(&bp, NULL);
1227 void avio_print_string_array(AVIOContext *s, const char *strings[])
1229 for(; *strings; strings++)
1230 avio_write(s, (const unsigned char *)*strings, strlen(*strings));
1233 int avio_pause(AVIOContext *s, int pause)
1236 return AVERROR(ENOSYS);
1237 return s->read_pause(s->opaque, pause);
1240 int64_t avio_seek_time(AVIOContext *s, int stream_index,
1241 int64_t timestamp, int flags)
1245 return AVERROR(ENOSYS);
1246 ret = s->read_seek(s->opaque, stream_index, timestamp, flags);
1249 s->buf_ptr = s->buf_end; // Flush buffer
1250 pos = s->seek(s->opaque, 0, SEEK_CUR);
1253 else if (pos != AVERROR(ENOSYS))
1259 int avio_read_to_bprint(AVIOContext *h, AVBPrint *pb, size_t max_size)
1264 ret = avio_read(h, buf, FFMIN(max_size, sizeof(buf)));
1265 if (ret == AVERROR_EOF)
1269 av_bprint_append_data(pb, buf, ret);
1270 if (!av_bprint_is_complete(pb))
1271 return AVERROR(ENOMEM);
1277 int avio_accept(AVIOContext *s, AVIOContext **c)
1280 URLContext *sc = s->opaque;
1281 URLContext *cc = NULL;
1282 ret = ffurl_accept(sc, &cc);
1285 return ffio_fdopen(c, cc);
1288 int avio_handshake(AVIOContext *c)
1290 URLContext *cc = c->opaque;
1291 return ffurl_handshake(cc);
1294 /* output in a dynamic buffer */
1296 typedef struct DynBuffer {
1297 int pos, size, allocated_size;
1300 uint8_t io_buffer[1];
1303 static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
1305 DynBuffer *d = opaque;
1308 /* reallocate buffer if needed */
1309 new_size = (unsigned)d->pos + buf_size;
1310 if (new_size < d->pos || new_size > INT_MAX)
1311 return AVERROR(ERANGE);
1312 if (new_size > d->allocated_size) {
1313 unsigned new_allocated_size = d->allocated_size ? d->allocated_size
1316 while (new_size > new_allocated_size)
1317 new_allocated_size += new_allocated_size / 2 + 1;
1319 new_allocated_size = FFMIN(new_allocated_size, INT_MAX);
1321 if ((err = av_reallocp(&d->buffer, new_allocated_size)) < 0) {
1322 d->allocated_size = 0;
1326 d->allocated_size = new_allocated_size;
1328 memcpy(d->buffer + d->pos, buf, buf_size);
1330 if (d->pos > d->size)
1335 static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
1337 unsigned char buf1[4];
1340 /* packetized write: output the header */
1341 AV_WB32(buf1, buf_size);
1342 ret = dyn_buf_write(opaque, buf1, 4);
1347 return dyn_buf_write(opaque, buf, buf_size);
1350 static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence)
1352 DynBuffer *d = opaque;
1354 if (whence == SEEK_CUR)
1356 else if (whence == SEEK_END)
1359 return AVERROR(EINVAL);
1360 if (offset > INT_MAX)
1361 return AVERROR(ERANGE);
1366 static int url_open_dyn_buf_internal(AVIOContext **s, int max_packet_size)
1369 unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024;
1371 if (sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
1372 return AVERROR(ERANGE);
1373 d = av_mallocz(sizeof(DynBuffer) + io_buffer_size);
1375 return AVERROR(ENOMEM);
1376 d->io_buffer_size = io_buffer_size;
1377 *s = avio_alloc_context(d->io_buffer, d->io_buffer_size, 1, d, NULL,
1378 max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
1379 max_packet_size ? NULL : dyn_buf_seek);
1382 return AVERROR(ENOMEM);
1384 (*s)->max_packet_size = max_packet_size;
1388 int avio_open_dyn_buf(AVIOContext **s)
1390 return url_open_dyn_buf_internal(s, 0);
1393 int ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size)
1395 if (max_packet_size <= 0)
1396 return AVERROR(EINVAL);
1397 return url_open_dyn_buf_internal(s, max_packet_size);
1400 int avio_get_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
1410 if (!s->error && !d->size) {
1411 *pbuffer = d->io_buffer;
1412 return FFMAX(s->buf_ptr, s->buf_ptr_max) - s->buffer;
1417 *pbuffer = d->buffer;
1422 void ffio_reset_dyn_buf(AVIOContext *s)
1424 DynBuffer *d = s->opaque;
1425 int max_packet_size = s->max_packet_size;
1427 ffio_init_context(s, d->io_buffer, d->io_buffer_size, 1, d, NULL,
1428 s->write_packet, s->seek);
1429 s->max_packet_size = max_packet_size;
1430 d->pos = d->size = 0;
1433 int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
1437 static const char padbuf[AV_INPUT_BUFFER_PADDING_SIZE] = {0};
1445 /* don't attempt to pad fixed-size packet buffers */
1446 if (!s->max_packet_size) {
1447 avio_write(s, padbuf, sizeof(padbuf));
1448 padding = AV_INPUT_BUFFER_PADDING_SIZE;
1454 *pbuffer = d->buffer;
1458 avio_context_free(&s);
1460 return size - padding;
1463 void ffio_free_dyn_buf(AVIOContext **s)
1473 avio_context_free(s);
1476 static int null_buf_write(void *opaque, uint8_t *buf, int buf_size)
1478 DynBuffer *d = opaque;
1481 if (d->pos > d->size)
1486 int ffio_open_null_buf(AVIOContext **s)
1488 int ret = url_open_dyn_buf_internal(s, 0);
1490 AVIOContext *pb = *s;
1491 pb->write_packet = null_buf_write;
1496 int ffio_close_null_buf(AVIOContext *s)
1498 DynBuffer *d = s->opaque;
1506 avio_context_free(&s);