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 typedef struct AVIOInternal {
49 static void *ff_avio_child_next(void *obj, void *prev)
52 AVIOInternal *internal = s->opaque;
53 return prev ? NULL : internal->h;
56 static const AVClass *ff_avio_child_class_next(const AVClass *prev)
58 return prev ? NULL : &ffurl_context_class;
61 #define OFFSET(x) offsetof(AVIOContext,x)
62 #define E AV_OPT_FLAG_ENCODING_PARAM
63 #define D AV_OPT_FLAG_DECODING_PARAM
64 static const AVOption ff_avio_options[] = {
65 {"protocol_whitelist", "List of protocols that are allowed to be used", OFFSET(protocol_whitelist), AV_OPT_TYPE_STRING, { .str = NULL }, CHAR_MIN, CHAR_MAX, D },
69 const AVClass ff_avio_class = {
70 .class_name = "AVIOContext",
71 .item_name = av_default_item_name,
72 .version = LIBAVUTIL_VERSION_INT,
73 .option = ff_avio_options,
74 .child_next = ff_avio_child_next,
75 .child_class_next = ff_avio_child_class_next,
78 static void fill_buffer(AVIOContext *s);
79 static int url_resetbuf(AVIOContext *s, int flags);
81 int ffio_init_context(AVIOContext *s,
82 unsigned char *buffer,
86 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
87 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
88 int64_t (*seek)(void *opaque, int64_t offset, int whence))
90 memset(s, 0, sizeof(AVIOContext));
94 s->buffer_size = buffer_size;
96 s->buf_ptr_max = buffer;
100 url_resetbuf(s, write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ);
102 s->write_packet = write_packet;
103 s->read_packet = read_packet;
108 s->seekable = seek ? AVIO_SEEKABLE_NORMAL : 0;
109 s->min_packet_size = 0;
110 s->max_packet_size = 0;
111 s->update_checksum = NULL;
112 s->short_seek_threshold = SHORT_SEEK_THRESHOLD;
114 if (!read_packet && !write_flag) {
115 s->pos = buffer_size;
116 s->buf_end = s->buffer + buffer_size;
118 s->read_pause = NULL;
121 s->write_data_type = NULL;
122 s->ignore_boundary_point = 0;
123 s->current_type = AVIO_DATA_MARKER_UNKNOWN;
124 s->last_time = AV_NOPTS_VALUE;
125 s->short_seek_get = NULL;
131 AVIOContext *avio_alloc_context(
132 unsigned char *buffer,
136 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
137 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
138 int64_t (*seek)(void *opaque, int64_t offset, int whence))
140 AVIOContext *s = av_malloc(sizeof(AVIOContext));
143 ffio_init_context(s, buffer, buffer_size, write_flag, opaque,
144 read_packet, write_packet, seek);
148 void avio_context_free(AVIOContext **ps)
153 static void writeout(AVIOContext *s, const uint8_t *data, int len)
157 if (s->write_data_type)
158 ret = s->write_data_type(s->opaque, (uint8_t *)data,
162 else if (s->write_packet)
163 ret = s->write_packet(s->opaque, (uint8_t *)data, len);
167 if (s->pos + len > s->written)
168 s->written = s->pos + len;
171 if (s->current_type == AVIO_DATA_MARKER_SYNC_POINT ||
172 s->current_type == AVIO_DATA_MARKER_BOUNDARY_POINT) {
173 s->current_type = AVIO_DATA_MARKER_UNKNOWN;
175 s->last_time = AV_NOPTS_VALUE;
176 s->writeout_count ++;
180 static void flush_buffer(AVIOContext *s)
182 s->buf_ptr_max = FFMAX(s->buf_ptr, s->buf_ptr_max);
183 if (s->write_flag && s->buf_ptr_max > s->buffer) {
184 writeout(s, s->buffer, s->buf_ptr_max - s->buffer);
185 if (s->update_checksum) {
186 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
187 s->buf_ptr_max - s->checksum_ptr);
188 s->checksum_ptr = s->buffer;
191 s->buf_ptr = s->buf_ptr_max = s->buffer;
193 s->buf_end = s->buffer;
196 void avio_w8(AVIOContext *s, int b)
198 av_assert2(b>=-128 && b<=255);
200 if (s->buf_ptr >= s->buf_end)
204 void ffio_fill(AVIOContext *s, int b, int count)
207 int len = FFMIN(s->buf_end - s->buf_ptr, count);
208 memset(s->buf_ptr, b, len);
211 if (s->buf_ptr >= s->buf_end)
218 void avio_write(AVIOContext *s, const unsigned char *buf, int size)
220 if (s->direct && !s->update_checksum) {
222 writeout(s, buf, size);
226 int len = FFMIN(s->buf_end - s->buf_ptr, size);
227 memcpy(s->buf_ptr, buf, len);
230 if (s->buf_ptr >= s->buf_end)
238 void avio_flush(AVIOContext *s)
240 int seekback = s->write_flag ? FFMIN(0, s->buf_ptr - s->buf_ptr_max) : 0;
243 avio_seek(s, seekback, SEEK_CUR);
246 int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
250 int force = whence & AVSEEK_FORCE;
253 whence &= ~AVSEEK_FORCE;
256 return AVERROR(EINVAL);
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 if (s->short_seek_get) {
277 short_seek = s->short_seek_get(s->opaque);
278 /* fallback to default short seek */
280 short_seek = s->short_seek_threshold;
282 short_seek = s->short_seek_threshold;
284 offset1 = offset - pos; // "offset1" is the relative offset from the beginning of s->buffer
285 s->buf_ptr_max = FFMAX(s->buf_ptr_max, s->buf_ptr);
286 if ((!s->direct || !s->seek) &&
287 offset1 >= 0 && offset1 <= (s->write_flag ? s->buf_ptr_max - s->buffer : buffer_size)) {
288 /* can do the seek inside the buffer */
289 s->buf_ptr = s->buffer + offset1;
290 } else if ((!(s->seekable & AVIO_SEEKABLE_NORMAL) ||
291 offset1 <= buffer_size + short_seek) &&
292 !s->write_flag && offset1 >= 0 &&
293 (!s->direct || !s->seek) &&
294 (whence != SEEK_END || force)) {
295 while(s->pos < offset && !s->eof_reached)
299 s->buf_ptr = s->buf_end - (s->pos - offset);
300 } else if(!s->write_flag && offset1 < 0 && -offset1 < buffer_size>>1 && s->seek && offset > 0) {
303 pos -= FFMIN(buffer_size>>1, pos);
304 if ((res = s->seek(s->opaque, pos, SEEK_SET)) < 0)
307 s->buf_ptr = s->buffer;
311 return avio_seek(s, offset, SEEK_SET | force);
318 return AVERROR(EPIPE);
319 if ((res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
323 s->buf_end = s->buffer;
324 s->buf_ptr = s->buf_ptr_max = s->buffer;
331 int64_t avio_skip(AVIOContext *s, int64_t offset)
333 return avio_seek(s, offset, SEEK_CUR);
336 int64_t avio_size(AVIOContext *s)
341 return AVERROR(EINVAL);
347 return AVERROR(ENOSYS);
348 size = s->seek(s->opaque, 0, AVSEEK_SIZE);
350 if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
353 s->seek(s->opaque, s->pos, SEEK_SET);
358 int avio_feof(AVIOContext *s)
366 return s->eof_reached;
369 void avio_wl32(AVIOContext *s, unsigned int val)
371 avio_w8(s, (uint8_t) val );
372 avio_w8(s, (uint8_t)(val >> 8 ));
373 avio_w8(s, (uint8_t)(val >> 16));
374 avio_w8(s, val >> 24 );
377 void avio_wb32(AVIOContext *s, unsigned int val)
379 avio_w8(s, val >> 24 );
380 avio_w8(s, (uint8_t)(val >> 16));
381 avio_w8(s, (uint8_t)(val >> 8 ));
382 avio_w8(s, (uint8_t) val );
385 int avio_put_str(AVIOContext *s, const char *str)
390 avio_write(s, (const unsigned char *) str, len);
396 static inline int put_str16(AVIOContext *s, const char *str, const int be)
398 const uint8_t *q = str;
406 GET_UTF8(ch, *q++, goto invalid;)
407 PUT_UTF16(ch, tmp, be ? avio_wb16(s, tmp) : avio_wl16(s, tmp);
411 av_log(s, AV_LOG_ERROR, "Invalid UTF8 sequence in avio_put_str16%s\n", be ? "be" : "le");
412 err = AVERROR(EINVAL);
426 #define PUT_STR16(type, big_endian) \
427 int avio_put_str16 ## type(AVIOContext *s, const char *str) \
429 return put_str16(s, str, big_endian); \
437 int ff_get_v_length(uint64_t val)
447 void ff_put_v(AVIOContext *bc, uint64_t val)
449 int i = ff_get_v_length(val);
452 avio_w8(bc, 128 | (uint8_t)(val >> (7*i)));
454 avio_w8(bc, val & 127);
457 void avio_wl64(AVIOContext *s, uint64_t val)
459 avio_wl32(s, (uint32_t)(val & 0xffffffff));
460 avio_wl32(s, (uint32_t)(val >> 32));
463 void avio_wb64(AVIOContext *s, uint64_t val)
465 avio_wb32(s, (uint32_t)(val >> 32));
466 avio_wb32(s, (uint32_t)(val & 0xffffffff));
469 void avio_wl16(AVIOContext *s, unsigned int val)
471 avio_w8(s, (uint8_t)val);
472 avio_w8(s, (int)val >> 8);
475 void avio_wb16(AVIOContext *s, unsigned int val)
477 avio_w8(s, (int)val >> 8);
478 avio_w8(s, (uint8_t)val);
481 void avio_wl24(AVIOContext *s, unsigned int val)
483 avio_wl16(s, val & 0xffff);
484 avio_w8(s, (int)val >> 16);
487 void avio_wb24(AVIOContext *s, unsigned int val)
489 avio_wb16(s, (int)val >> 8);
490 avio_w8(s, (uint8_t)val);
493 void avio_write_marker(AVIOContext *s, int64_t time, enum AVIODataMarkerType type)
495 if (type == AVIO_DATA_MARKER_FLUSH_POINT) {
496 if (s->buf_ptr - s->buffer >= s->min_packet_size)
500 if (!s->write_data_type)
502 // If ignoring boundary points, just treat it as unknown
503 if (type == AVIO_DATA_MARKER_BOUNDARY_POINT && s->ignore_boundary_point)
504 type = AVIO_DATA_MARKER_UNKNOWN;
505 // Avoid unnecessary flushes if we are already in non-header/trailer
506 // data and setting the type to unknown
507 if (type == AVIO_DATA_MARKER_UNKNOWN &&
508 (s->current_type != AVIO_DATA_MARKER_HEADER &&
509 s->current_type != AVIO_DATA_MARKER_TRAILER))
513 case AVIO_DATA_MARKER_HEADER:
514 case AVIO_DATA_MARKER_TRAILER:
515 // For header/trailer, ignore a new marker of the same type;
516 // consecutive header/trailer markers can be merged.
517 if (type == s->current_type)
522 // If we've reached here, we have a new, noteworthy marker.
523 // Flush the previous data and mark the start of the new data.
525 s->current_type = type;
529 static int read_packet_wrapper(AVIOContext *s, uint8_t *buf, int size)
534 return AVERROR(EINVAL);
535 ret = s->read_packet(s->opaque, buf, size);
536 #if FF_API_OLD_AVIO_EOF_0
537 if (!ret && !s->max_packet_size) {
538 av_log(NULL, AV_LOG_WARNING, "Invalid return value 0 for stream protocol\n");
542 av_assert2(ret || s->max_packet_size);
549 static void fill_buffer(AVIOContext *s)
551 int max_buffer_size = s->max_packet_size ?
552 s->max_packet_size : IO_BUFFER_SIZE;
553 uint8_t *dst = s->buf_end - s->buffer + max_buffer_size < s->buffer_size ?
554 s->buf_end : s->buffer;
555 int len = s->buffer_size - (dst - s->buffer);
557 /* can't fill the buffer without read_packet, just set EOF if appropriate */
558 if (!s->read_packet && s->buf_ptr >= s->buf_end)
561 /* no need to do anything if EOF already reached */
565 if (s->update_checksum && dst == s->buffer) {
566 if (s->buf_end > s->checksum_ptr)
567 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
568 s->buf_end - s->checksum_ptr);
569 s->checksum_ptr = s->buffer;
572 /* make buffer smaller in case it ended up large after probing */
573 if (s->read_packet && s->orig_buffer_size && s->buffer_size > s->orig_buffer_size && len >= s->orig_buffer_size) {
574 if (dst == s->buffer && s->buf_ptr != dst) {
575 int ret = ffio_set_buf_size(s, s->orig_buffer_size);
577 av_log(s, AV_LOG_WARNING, "Failed to decrease buffer size\n");
579 s->checksum_ptr = dst = s->buffer;
581 len = s->orig_buffer_size;
584 len = read_packet_wrapper(s, dst, len);
585 if (len == AVERROR_EOF) {
586 /* do not modify buffer if EOF reached so that a seek back can
587 be done without rereading data */
589 } else if (len < 0) {
595 s->buf_end = dst + len;
596 s->bytes_read += len;
600 unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
603 return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
606 unsigned long ff_crcEDB88320_update(unsigned long checksum, const uint8_t *buf,
609 return av_crc(av_crc_get_table(AV_CRC_32_IEEE_LE), checksum, buf, len);
612 unsigned long ff_crcA001_update(unsigned long checksum, const uint8_t *buf,
615 return av_crc(av_crc_get_table(AV_CRC_16_ANSI_LE), checksum, buf, len);
618 unsigned long ffio_get_checksum(AVIOContext *s)
620 s->checksum = s->update_checksum(s->checksum, s->checksum_ptr,
621 s->buf_ptr - s->checksum_ptr);
622 s->update_checksum = NULL;
626 void ffio_init_checksum(AVIOContext *s,
627 unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
628 unsigned long checksum)
630 s->update_checksum = update_checksum;
631 if (s->update_checksum) {
632 s->checksum = checksum;
633 s->checksum_ptr = s->buf_ptr;
637 /* XXX: put an inline version */
638 int avio_r8(AVIOContext *s)
640 if (s->buf_ptr >= s->buf_end)
642 if (s->buf_ptr < s->buf_end)
643 return *s->buf_ptr++;
647 int avio_read(AVIOContext *s, unsigned char *buf, int size)
653 len = FFMIN(s->buf_end - s->buf_ptr, size);
654 if (len == 0 || s->write_flag) {
655 if((s->direct || size > s->buffer_size) && !s->update_checksum) {
656 // bypass the buffer and read data directly into buf
657 len = read_packet_wrapper(s, buf, size);
658 if (len == AVERROR_EOF) {
659 /* do not modify buffer if EOF reached so that a seek back can
660 be done without rereading data */
663 } else if (len < 0) {
669 s->bytes_read += len;
673 s->buf_ptr = s->buffer;
674 s->buf_end = s->buffer/* + len*/;
678 len = s->buf_end - s->buf_ptr;
683 memcpy(buf, s->buf_ptr, len);
690 if (s->error) return s->error;
691 if (avio_feof(s)) return AVERROR_EOF;
696 int ffio_read_size(AVIOContext *s, unsigned char *buf, int size)
698 int ret = avio_read(s, buf, size);
700 return AVERROR_INVALIDDATA;
704 int ffio_read_indirect(AVIOContext *s, unsigned char *buf, int size, const unsigned char **data)
706 if (s->buf_end - s->buf_ptr >= size && !s->write_flag) {
712 return avio_read(s, buf, size);
716 int avio_read_partial(AVIOContext *s, unsigned char *buf, int size)
723 if (s->read_packet && s->write_flag) {
724 len = read_packet_wrapper(s, buf, size);
730 len = s->buf_end - s->buf_ptr;
732 /* Reset the buf_end pointer to the start of the buffer, to make sure
733 * the fill_buffer call tries to read as much data as fits into the
734 * full buffer, instead of just what space is left after buf_end.
735 * This avoids returning partial packets at the end of the buffer,
736 * for packet based inputs.
738 s->buf_end = s->buf_ptr = s->buffer;
740 len = s->buf_end - s->buf_ptr;
744 memcpy(buf, s->buf_ptr, len);
747 if (s->error) return s->error;
748 if (avio_feof(s)) return AVERROR_EOF;
753 unsigned int avio_rl16(AVIOContext *s)
757 val |= avio_r8(s) << 8;
761 unsigned int avio_rl24(AVIOContext *s)
765 val |= avio_r8(s) << 16;
769 unsigned int avio_rl32(AVIOContext *s)
773 val |= avio_rl16(s) << 16;
777 uint64_t avio_rl64(AVIOContext *s)
780 val = (uint64_t)avio_rl32(s);
781 val |= (uint64_t)avio_rl32(s) << 32;
785 unsigned int avio_rb16(AVIOContext *s)
788 val = avio_r8(s) << 8;
793 unsigned int avio_rb24(AVIOContext *s)
796 val = avio_rb16(s) << 8;
800 unsigned int avio_rb32(AVIOContext *s)
803 val = avio_rb16(s) << 16;
808 int ff_get_line(AVIOContext *s, char *buf, int maxlen)
815 if (c && i < maxlen-1)
817 } while (c != '\n' && c != '\r' && c);
818 if (c == '\r' && avio_r8(s) != '\n' && !avio_feof(s))
825 int ff_get_chomp_line(AVIOContext *s, char *buf, int maxlen)
827 int len = ff_get_line(s, buf, maxlen);
828 while (len > 0 && av_isspace(buf[len - 1]))
833 int64_t ff_read_line_to_bprint(AVIOContext *s, AVBPrint *bp)
844 end = (c == '\r' || c == '\n' || c == '\0');
847 } while (!end && len < sizeof(tmp));
848 av_bprint_append_data(bp, tmp, len);
852 if (c == '\r' && avio_r8(s) != '\n' && !avio_feof(s))
858 if (!c && !read && avio_feof(s))
864 int64_t ff_read_line_to_bprint_overwrite(AVIOContext *s, AVBPrint *bp)
869 ret = ff_read_line_to_bprint(s, bp);
873 if (!av_bprint_is_complete(bp))
874 return AVERROR(ENOMEM);
879 int avio_get_str(AVIOContext *s, int maxlen, char *buf, int buflen)
884 return AVERROR(EINVAL);
885 // reserve 1 byte for terminating 0
886 buflen = FFMIN(buflen - 1, maxlen);
887 for (i = 0; i < buflen; i++)
888 if (!(buf[i] = avio_r8(s)))
891 for (; i < maxlen; i++)
897 #define GET_STR16(type, read) \
898 int avio_get_str16 ##type(AVIOContext *pb, int maxlen, char *buf, int buflen)\
903 return AVERROR(EINVAL); \
904 while (ret + 1 < maxlen) {\
907 GET_UTF16(ch, (ret += 2) <= maxlen ? read(pb) : 0, break;)\
910 PUT_UTF8(ch, tmp, if (q - buf < buflen - 1) *q++ = tmp;)\
916 GET_STR16(le, avio_rl16)
917 GET_STR16(be, avio_rb16)
921 uint64_t avio_rb64(AVIOContext *s)
924 val = (uint64_t)avio_rb32(s) << 32;
925 val |= (uint64_t)avio_rb32(s);
929 uint64_t ffio_read_varlen(AVIOContext *bc){
935 val= (val<<7) + (tmp&127);
940 static int io_read_packet(void *opaque, uint8_t *buf, int buf_size)
942 AVIOInternal *internal = opaque;
943 return ffurl_read(internal->h, buf, buf_size);
946 static int io_write_packet(void *opaque, uint8_t *buf, int buf_size)
948 AVIOInternal *internal = opaque;
949 return ffurl_write(internal->h, buf, buf_size);
952 static int64_t io_seek(void *opaque, int64_t offset, int whence)
954 AVIOInternal *internal = opaque;
955 return ffurl_seek(internal->h, offset, whence);
958 static int io_short_seek(void *opaque)
960 AVIOInternal *internal = opaque;
961 return ffurl_get_short_seek(internal->h);
964 static int io_read_pause(void *opaque, int pause)
966 AVIOInternal *internal = opaque;
967 if (!internal->h->prot->url_read_pause)
968 return AVERROR(ENOSYS);
969 return internal->h->prot->url_read_pause(internal->h, pause);
972 static int64_t io_read_seek(void *opaque, int stream_index, int64_t timestamp, int flags)
974 AVIOInternal *internal = opaque;
975 if (!internal->h->prot->url_read_seek)
976 return AVERROR(ENOSYS);
977 return internal->h->prot->url_read_seek(internal->h, stream_index, timestamp, flags);
980 int ffio_fdopen(AVIOContext **s, URLContext *h)
982 AVIOInternal *internal = NULL;
983 uint8_t *buffer = NULL;
984 int buffer_size, max_packet_size;
986 max_packet_size = h->max_packet_size;
987 if (max_packet_size) {
988 buffer_size = max_packet_size; /* no need to bufferize more than one packet */
990 buffer_size = IO_BUFFER_SIZE;
992 buffer = av_malloc(buffer_size);
994 return AVERROR(ENOMEM);
996 internal = av_mallocz(sizeof(*internal));
1002 *s = avio_alloc_context(buffer, buffer_size, h->flags & AVIO_FLAG_WRITE,
1003 internal, io_read_packet, io_write_packet, io_seek);
1007 (*s)->protocol_whitelist = av_strdup(h->protocol_whitelist);
1008 if (!(*s)->protocol_whitelist && h->protocol_whitelist) {
1012 (*s)->protocol_blacklist = av_strdup(h->protocol_blacklist);
1013 if (!(*s)->protocol_blacklist && h->protocol_blacklist) {
1017 (*s)->direct = h->flags & AVIO_FLAG_DIRECT;
1019 (*s)->seekable = h->is_streamed ? 0 : AVIO_SEEKABLE_NORMAL;
1020 (*s)->max_packet_size = max_packet_size;
1021 (*s)->min_packet_size = h->min_packet_size;
1023 (*s)->read_pause = io_read_pause;
1024 (*s)->read_seek = io_read_seek;
1026 if (h->prot->url_read_seek)
1027 (*s)->seekable |= AVIO_SEEKABLE_TIME;
1029 (*s)->short_seek_get = io_short_seek;
1030 (*s)->av_class = &ff_avio_class;
1033 av_freep(&internal);
1035 return AVERROR(ENOMEM);
1038 URLContext* ffio_geturlcontext(AVIOContext *s)
1040 AVIOInternal *internal;
1044 internal = s->opaque;
1045 if (internal && s->read_packet == io_read_packet)
1051 int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size)
1054 int max_buffer_size = s->max_packet_size ?
1055 s->max_packet_size : IO_BUFFER_SIZE;
1056 int filled = s->buf_end - s->buffer;
1057 ptrdiff_t checksum_ptr_offset = s->checksum_ptr ? s->checksum_ptr - s->buffer : -1;
1059 buf_size += s->buf_ptr - s->buffer + max_buffer_size;
1061 if (buf_size < filled || s->seekable || !s->read_packet)
1063 av_assert0(!s->write_flag);
1065 buffer = av_malloc(buf_size);
1067 return AVERROR(ENOMEM);
1069 memcpy(buffer, s->buffer, filled);
1071 s->buf_ptr = buffer + (s->buf_ptr - s->buffer);
1072 s->buf_end = buffer + (s->buf_end - s->buffer);
1074 s->buffer_size = buf_size;
1075 if (checksum_ptr_offset >= 0)
1076 s->checksum_ptr = s->buffer + checksum_ptr_offset;
1080 int ffio_set_buf_size(AVIOContext *s, int buf_size)
1083 buffer = av_malloc(buf_size);
1085 return AVERROR(ENOMEM);
1089 s->orig_buffer_size =
1090 s->buffer_size = buf_size;
1091 s->buf_ptr = s->buf_ptr_max = buffer;
1092 url_resetbuf(s, s->write_flag ? AVIO_FLAG_WRITE : AVIO_FLAG_READ);
1096 static int url_resetbuf(AVIOContext *s, int flags)
1098 av_assert1(flags == AVIO_FLAG_WRITE || flags == AVIO_FLAG_READ);
1100 if (flags & AVIO_FLAG_WRITE) {
1101 s->buf_end = s->buffer + s->buffer_size;
1104 s->buf_end = s->buffer;
1110 int ffio_rewind_with_probe_data(AVIOContext *s, unsigned char **bufp, int buf_size)
1112 int64_t buffer_start;
1114 int overlap, new_size, alloc_size;
1115 uint8_t *buf = *bufp;
1117 if (s->write_flag) {
1119 return AVERROR(EINVAL);
1122 buffer_size = s->buf_end - s->buffer;
1124 /* the buffers must touch or overlap */
1125 if ((buffer_start = s->pos - buffer_size) > buf_size) {
1127 return AVERROR(EINVAL);
1130 overlap = buf_size - buffer_start;
1131 new_size = buf_size + buffer_size - overlap;
1133 alloc_size = FFMAX(s->buffer_size, new_size);
1134 if (alloc_size > buf_size)
1135 if (!(buf = (*bufp) = av_realloc_f(buf, 1, alloc_size)))
1136 return AVERROR(ENOMEM);
1138 if (new_size > buf_size) {
1139 memcpy(buf + buf_size, s->buffer + overlap, buffer_size - overlap);
1140 buf_size = new_size;
1144 s->buf_ptr = s->buffer = buf;
1145 s->buffer_size = alloc_size;
1147 s->buf_end = s->buf_ptr + buf_size;
1153 int avio_open(AVIOContext **s, const char *filename, int flags)
1155 return avio_open2(s, filename, flags, NULL, NULL);
1158 int ffio_open_whitelist(AVIOContext **s, const char *filename, int flags,
1159 const AVIOInterruptCB *int_cb, AVDictionary **options,
1160 const char *whitelist, const char *blacklist
1166 err = ffurl_open_whitelist(&h, filename, flags, int_cb, options, whitelist, blacklist, NULL);
1169 err = ffio_fdopen(s, h);
1177 int avio_open2(AVIOContext **s, const char *filename, int flags,
1178 const AVIOInterruptCB *int_cb, AVDictionary **options)
1180 return ffio_open_whitelist(s, filename, flags, int_cb, options, NULL, NULL);
1183 int ffio_open2_wrapper(struct AVFormatContext *s, AVIOContext **pb, const char *url, int flags,
1184 const AVIOInterruptCB *int_cb, AVDictionary **options)
1186 return ffio_open_whitelist(pb, url, flags, int_cb, options, s->protocol_whitelist, s->protocol_blacklist);
1189 int avio_close(AVIOContext *s)
1191 AVIOInternal *internal;
1198 internal = s->opaque;
1201 av_freep(&s->opaque);
1202 av_freep(&s->buffer);
1204 av_log(s, AV_LOG_VERBOSE, "Statistics: %d seeks, %d writeouts\n", s->seek_count, s->writeout_count);
1206 av_log(s, AV_LOG_VERBOSE, "Statistics: %"PRId64" bytes read, %d seeks\n", s->bytes_read, s->seek_count);
1209 avio_context_free(&s);
1211 return ffurl_close(h);
1214 int avio_closep(AVIOContext **s)
1216 int ret = avio_close(*s);
1221 int avio_printf(AVIOContext *s, const char *fmt, ...)
1224 char buf[4096]; /* update doc entry in avio.h if changed */
1228 ret = vsnprintf(buf, sizeof(buf), fmt, ap);
1230 avio_write(s, buf, strlen(buf));
1234 int avio_pause(AVIOContext *s, int pause)
1237 return AVERROR(ENOSYS);
1238 return s->read_pause(s->opaque, pause);
1241 int64_t avio_seek_time(AVIOContext *s, int stream_index,
1242 int64_t timestamp, int flags)
1246 return AVERROR(ENOSYS);
1247 ret = s->read_seek(s->opaque, stream_index, timestamp, flags);
1250 s->buf_ptr = s->buf_end; // Flush buffer
1251 pos = s->seek(s->opaque, 0, SEEK_CUR);
1254 else if (pos != AVERROR(ENOSYS))
1260 int avio_read_to_bprint(AVIOContext *h, AVBPrint *pb, size_t max_size)
1265 ret = avio_read(h, buf, FFMIN(max_size, sizeof(buf)));
1266 if (ret == AVERROR_EOF)
1270 av_bprint_append_data(pb, buf, ret);
1271 if (!av_bprint_is_complete(pb))
1272 return AVERROR(ENOMEM);
1278 int avio_accept(AVIOContext *s, AVIOContext **c)
1281 AVIOInternal *internal = s->opaque;
1282 URLContext *sc = internal->h;
1283 URLContext *cc = NULL;
1284 ret = ffurl_accept(sc, &cc);
1287 return ffio_fdopen(c, cc);
1290 int avio_handshake(AVIOContext *c)
1292 AVIOInternal *internal = c->opaque;
1293 URLContext *cc = internal->h;
1294 return ffurl_handshake(cc);
1297 /* output in a dynamic buffer */
1299 typedef struct DynBuffer {
1300 int pos, size, allocated_size;
1303 uint8_t io_buffer[1];
1306 static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
1308 DynBuffer *d = opaque;
1309 unsigned new_size, new_allocated_size;
1311 /* reallocate buffer if needed */
1312 new_size = d->pos + buf_size;
1313 new_allocated_size = d->allocated_size;
1314 if (new_size < d->pos || new_size > INT_MAX/2)
1316 while (new_size > new_allocated_size) {
1317 if (!new_allocated_size)
1318 new_allocated_size = new_size;
1320 new_allocated_size += new_allocated_size / 2 + 1;
1323 if (new_allocated_size > d->allocated_size) {
1325 if ((err = av_reallocp(&d->buffer, new_allocated_size)) < 0) {
1326 d->allocated_size = 0;
1330 d->allocated_size = new_allocated_size;
1332 memcpy(d->buffer + d->pos, buf, buf_size);
1334 if (d->pos > d->size)
1339 static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
1341 unsigned char buf1[4];
1344 /* packetized write: output the header */
1345 AV_WB32(buf1, buf_size);
1346 ret = dyn_buf_write(opaque, buf1, 4);
1351 return dyn_buf_write(opaque, buf, buf_size);
1354 static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence)
1356 DynBuffer *d = opaque;
1358 if (whence == SEEK_CUR)
1360 else if (whence == SEEK_END)
1362 if (offset < 0 || offset > 0x7fffffffLL)
1368 static int url_open_dyn_buf_internal(AVIOContext **s, int max_packet_size)
1371 unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024;
1373 if (sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
1375 d = av_mallocz(sizeof(DynBuffer) + io_buffer_size);
1377 return AVERROR(ENOMEM);
1378 d->io_buffer_size = io_buffer_size;
1379 *s = avio_alloc_context(d->io_buffer, d->io_buffer_size, 1, d, NULL,
1380 max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
1381 max_packet_size ? NULL : dyn_buf_seek);
1384 return AVERROR(ENOMEM);
1386 (*s)->max_packet_size = max_packet_size;
1390 int avio_open_dyn_buf(AVIOContext **s)
1392 return url_open_dyn_buf_internal(s, 0);
1395 int ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size)
1397 if (max_packet_size <= 0)
1399 return url_open_dyn_buf_internal(s, max_packet_size);
1402 int avio_get_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
1414 *pbuffer = d->buffer;
1419 int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
1423 static const char padbuf[AV_INPUT_BUFFER_PADDING_SIZE] = {0};
1431 /* don't attempt to pad fixed-size packet buffers */
1432 if (!s->max_packet_size) {
1433 avio_write(s, padbuf, sizeof(padbuf));
1434 padding = AV_INPUT_BUFFER_PADDING_SIZE;
1440 *pbuffer = d->buffer;
1444 avio_context_free(&s);
1446 return size - padding;
1449 void ffio_free_dyn_buf(AVIOContext **s)
1454 avio_close_dyn_buf(*s, &tmp);
1459 static int null_buf_write(void *opaque, uint8_t *buf, int buf_size)
1461 DynBuffer *d = opaque;
1464 if (d->pos > d->size)
1469 int ffio_open_null_buf(AVIOContext **s)
1471 int ret = url_open_dyn_buf_internal(s, 0);
1473 AVIOContext *pb = *s;
1474 pb->write_packet = null_buf_write;
1479 int ffio_close_null_buf(AVIOContext *s)
1481 DynBuffer *d = s->opaque;
1489 avio_context_free(&s);