2 * Buffered I/O for ffmpeg system
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
26 #define IO_BUFFER_SIZE 32768
28 static void fill_buffer(ByteIOContext *s);
30 int init_put_byte(ByteIOContext *s,
31 unsigned char *buffer,
35 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
36 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
37 offset_t (*seek)(void *opaque, offset_t offset, int whence))
40 s->buffer_size = buffer_size;
42 url_resetbuf(s, write_flag ? URL_WRONLY : URL_RDONLY);
44 s->write_packet = write_packet;
45 s->read_packet = read_packet;
52 s->max_packet_size = 0;
53 s->update_checksum= NULL;
54 if(!read_packet && !write_flag){
56 s->buf_end = s->buffer + buffer_size;
64 static void flush_buffer(ByteIOContext *s)
66 if (s->buf_ptr > s->buffer) {
67 if (s->write_packet && !s->error){
68 int ret= s->write_packet(s->opaque, s->buffer, s->buf_ptr - s->buffer);
73 if(s->update_checksum){
74 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
75 s->checksum_ptr= s->buffer;
77 s->pos += s->buf_ptr - s->buffer;
79 s->buf_ptr = s->buffer;
82 void put_byte(ByteIOContext *s, int b)
85 if (s->buf_ptr >= s->buf_end)
89 void put_buffer(ByteIOContext *s, const unsigned char *buf, int size)
94 len = (s->buf_end - s->buf_ptr);
97 memcpy(s->buf_ptr, buf, len);
100 if (s->buf_ptr >= s->buf_end)
108 void put_flush_packet(ByteIOContext *s)
114 offset_t url_fseek(ByteIOContext *s, offset_t offset, int whence)
120 return AVERROR(EINVAL);
122 pos = s->pos - (s->write_flag ? 0 : (s->buf_end - s->buffer));
124 if (whence != SEEK_CUR && whence != SEEK_SET)
125 return AVERROR(EINVAL);
127 if (whence == SEEK_CUR) {
128 offset1 = pos + (s->buf_ptr - s->buffer);
133 offset1 = offset - pos;
134 if (!s->must_flush &&
135 offset1 >= 0 && offset1 < (s->buf_end - s->buffer)) {
136 /* can do the seek inside the buffer */
137 s->buf_ptr = s->buffer + offset1;
138 } else if(s->is_streamed && !s->write_flag &&
139 offset1 >= 0 && offset1 < (s->buf_end - s->buffer) + (1<<16)){
140 while(s->pos < offset && !s->eof_reached)
142 s->buf_ptr = s->buf_end + offset - s->pos;
144 offset_t res = AVERROR(EPIPE);
146 #if defined(CONFIG_MUXERS) || defined(CONFIG_NETWORK)
151 #endif /* defined(CONFIG_MUXERS) || defined(CONFIG_NETWORK) */
153 s->buf_end = s->buffer;
155 s->buf_ptr = s->buffer;
156 if (!s->seek || (res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
164 void url_fskip(ByteIOContext *s, offset_t offset)
166 url_fseek(s, offset, SEEK_CUR);
169 offset_t url_ftell(ByteIOContext *s)
171 return url_fseek(s, 0, SEEK_CUR);
174 offset_t url_fsize(ByteIOContext *s)
179 return AVERROR(EINVAL);
182 return AVERROR(EPIPE);
183 size = s->seek(s->opaque, 0, AVSEEK_SIZE);
185 if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
188 s->seek(s->opaque, s->pos, SEEK_SET);
193 int url_feof(ByteIOContext *s)
197 return s->eof_reached;
200 int url_ferror(ByteIOContext *s)
207 void put_le32(ByteIOContext *s, unsigned int val)
210 put_byte(s, val >> 8);
211 put_byte(s, val >> 16);
212 put_byte(s, val >> 24);
215 void put_be32(ByteIOContext *s, unsigned int val)
217 put_byte(s, val >> 24);
218 put_byte(s, val >> 16);
219 put_byte(s, val >> 8);
223 void put_strz(ByteIOContext *s, const char *str)
226 put_buffer(s, (const unsigned char *) str, strlen(str) + 1);
231 void put_le64(ByteIOContext *s, uint64_t val)
233 put_le32(s, (uint32_t)(val & 0xffffffff));
234 put_le32(s, (uint32_t)(val >> 32));
237 void put_be64(ByteIOContext *s, uint64_t val)
239 put_be32(s, (uint32_t)(val >> 32));
240 put_be32(s, (uint32_t)(val & 0xffffffff));
243 void put_le16(ByteIOContext *s, unsigned int val)
246 put_byte(s, val >> 8);
249 void put_be16(ByteIOContext *s, unsigned int val)
251 put_byte(s, val >> 8);
255 void put_le24(ByteIOContext *s, unsigned int val)
257 put_le16(s, val & 0xffff);
258 put_byte(s, val >> 16);
261 void put_be24(ByteIOContext *s, unsigned int val)
263 put_be16(s, val >> 8);
267 void put_tag(ByteIOContext *s, const char *tag)
276 static void fill_buffer(ByteIOContext *s)
280 /* no need to do anything if EOF already reached */
284 if(s->update_checksum){
285 if(s->buf_end > s->checksum_ptr)
286 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_end - s->checksum_ptr);
287 s->checksum_ptr= s->buffer;
291 len = s->read_packet(s->opaque, s->buffer, s->buffer_size);
293 /* do not modify buffer if EOF reached so that a seek back can
294 be done without rereading data */
300 s->buf_ptr = s->buffer;
301 s->buf_end = s->buffer + len;
305 unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf, unsigned int len){
306 return av_crc(av_crc04C11DB7, checksum, buf, len);
309 unsigned long get_checksum(ByteIOContext *s){
310 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
311 s->update_checksum= NULL;
315 void init_checksum(ByteIOContext *s, unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len), unsigned long checksum){
316 s->update_checksum= update_checksum;
317 if(s->update_checksum){
318 s->checksum= checksum;
319 s->checksum_ptr= s->buf_ptr;
323 /* XXX: put an inline version */
324 int get_byte(ByteIOContext *s)
326 if (s->buf_ptr < s->buf_end) {
327 return *s->buf_ptr++;
330 if (s->buf_ptr < s->buf_end)
331 return *s->buf_ptr++;
337 int url_fgetc(ByteIOContext *s)
339 if (s->buf_ptr < s->buf_end) {
340 return *s->buf_ptr++;
343 if (s->buf_ptr < s->buf_end)
344 return *s->buf_ptr++;
350 int get_buffer(ByteIOContext *s, unsigned char *buf, int size)
356 len = s->buf_end - s->buf_ptr;
360 if(size > s->buffer_size && !s->update_checksum){
362 len = s->read_packet(s->opaque, buf, size);
364 /* do not modify buffer if EOF reached so that a seek back can
365 be done without rereading data */
374 s->buf_ptr = s->buffer;
375 s->buf_end = s->buffer/* + len*/;
379 len = s->buf_end - s->buf_ptr;
384 memcpy(buf, s->buf_ptr, len);
393 int get_partial_buffer(ByteIOContext *s, unsigned char *buf, int size)
400 len = s->buf_end - s->buf_ptr;
403 len = s->buf_end - s->buf_ptr;
407 memcpy(buf, s->buf_ptr, len);
412 unsigned int get_le16(ByteIOContext *s)
416 val |= get_byte(s) << 8;
420 unsigned int get_le24(ByteIOContext *s)
424 val |= get_byte(s) << 16;
428 unsigned int get_le32(ByteIOContext *s)
432 val |= get_le16(s) << 16;
436 uint64_t get_le64(ByteIOContext *s)
439 val = (uint64_t)get_le32(s);
440 val |= (uint64_t)get_le32(s) << 32;
444 unsigned int get_be16(ByteIOContext *s)
447 val = get_byte(s) << 8;
452 unsigned int get_be24(ByteIOContext *s)
455 val = get_be16(s) << 8;
459 unsigned int get_be32(ByteIOContext *s)
462 val = get_be16(s) << 16;
467 char *get_strz(ByteIOContext *s, char *buf, int maxlen)
472 while ((c = get_byte(s))) {
477 buf[i] = 0; /* Ensure null terminated, but may be truncated */
482 uint64_t get_be64(ByteIOContext *s)
485 val = (uint64_t)get_be32(s) << 32;
486 val |= (uint64_t)get_be32(s);
490 uint64_t ff_get_v(ByteIOContext *bc){
496 val= (val<<7) + (tmp&127);
501 /* link with avio functions */
504 static int url_write_packet(void *opaque, uint8_t *buf, int buf_size)
506 URLContext *h = opaque;
507 return url_write(h, buf, buf_size);
510 #define url_write_packet NULL
511 #endif //CONFIG_MUXERS
513 static int url_read_packet(void *opaque, uint8_t *buf, int buf_size)
515 URLContext *h = opaque;
516 return url_read(h, buf, buf_size);
519 static offset_t url_seek_packet(void *opaque, offset_t offset, int whence)
521 URLContext *h = opaque;
522 return url_seek(h, offset, whence);
526 int url_fdopen(ByteIOContext **s, URLContext *h)
529 int buffer_size, max_packet_size;
532 max_packet_size = url_get_max_packet_size(h);
533 if (max_packet_size) {
534 buffer_size = max_packet_size; /* no need to bufferize more than one packet */
536 buffer_size = IO_BUFFER_SIZE;
538 buffer = av_malloc(buffer_size);
540 return AVERROR(ENOMEM);
542 *s = av_mallocz(sizeof(ByteIOContext));
545 return AVERROR(ENOMEM);
548 if (init_put_byte(*s, buffer, buffer_size,
549 (h->flags & URL_WRONLY || h->flags & URL_RDWR), h,
550 url_read_packet, url_write_packet, url_seek_packet) < 0) {
555 (*s)->is_streamed = h->is_streamed;
556 (*s)->max_packet_size = max_packet_size;
558 (*s)->read_play = (int (*)(void *))h->prot->url_read_play;
559 (*s)->read_pause = (int (*)(void *))h->prot->url_read_pause;
560 (*s)->read_seek = (int (*)(void *, int, int64_t, int))h->prot->url_read_seek;
565 int url_setbufsize(ByteIOContext *s, int buf_size)
568 buffer = av_malloc(buf_size);
570 return AVERROR(ENOMEM);
574 s->buffer_size = buf_size;
576 url_resetbuf(s, s->write_flag ? URL_WRONLY : URL_RDONLY);
580 int url_resetbuf(ByteIOContext *s, int flags)
582 URLContext *h = s->opaque;
583 if ((flags & URL_RDWR) || (h && h->flags != flags && !h->flags & URL_RDWR))
584 return AVERROR(EINVAL);
586 if (flags & URL_WRONLY) {
587 s->buf_end = s->buffer + s->buffer_size;
590 s->buf_end = s->buffer;
596 int url_fopen(ByteIOContext **s, const char *filename, int flags)
601 err = url_open(&h, filename, flags);
604 err = url_fdopen(s, h);
612 int url_fclose(ByteIOContext *s)
614 URLContext *h = s->opaque;
621 URLContext *url_fileno(ByteIOContext *s)
627 int url_fprintf(ByteIOContext *s, const char *fmt, ...)
634 ret = vsnprintf(buf, sizeof(buf), fmt, ap);
636 put_buffer(s, buf, strlen(buf));
639 #endif //CONFIG_MUXERS
641 char *url_fgets(ByteIOContext *s, char *buf, int buf_size)
651 if (c == EOF || c == '\n')
653 if ((q - buf) < buf_size - 1)
662 int url_fget_max_packet_size(ByteIOContext *s)
664 return s->max_packet_size;
667 int av_url_read_fplay(ByteIOContext *s)
670 return AVERROR(ENOSYS);
671 return s->read_play(s->opaque);
674 int av_url_read_fpause(ByteIOContext *s)
677 return AVERROR(ENOSYS);
678 return s->read_pause(s->opaque);
681 int av_url_read_fseek(ByteIOContext *s,
682 int stream_index, int64_t timestamp, int flags)
684 URLContext *h = s->opaque;
687 return AVERROR(ENOSYS);
688 ret = s->read_seek(h, stream_index, timestamp, flags);
690 s->buf_ptr = s->buf_end; // Flush buffer
691 s->pos = s->seek(h, 0, SEEK_CUR);
696 /* url_open_dyn_buf and url_close_dyn_buf are used in rtp.c to send a response
697 * back to the server even if CONFIG_MUXERS is not set. */
698 #if defined(CONFIG_MUXERS) || defined(CONFIG_NETWORK)
699 /* buffer handling */
700 int url_open_buf(ByteIOContext **s, uint8_t *buf, int buf_size, int flags)
703 *s = av_mallocz(sizeof(ByteIOContext));
705 return AVERROR(ENOMEM);
706 ret = init_put_byte(*s, buf, buf_size,
707 (flags & URL_WRONLY || flags & URL_RDWR),
708 NULL, NULL, NULL, NULL);
714 int url_close_buf(ByteIOContext *s)
717 return s->buf_ptr - s->buffer;
720 /* output in a dynamic buffer */
722 typedef struct DynBuffer {
723 int pos, size, allocated_size;
726 uint8_t io_buffer[1];
729 static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
731 DynBuffer *d = opaque;
732 int new_size, new_allocated_size;
734 /* reallocate buffer if needed */
735 new_size = d->pos + buf_size;
736 new_allocated_size = d->allocated_size;
737 if(new_size < d->pos || new_size > INT_MAX/2)
739 while (new_size > new_allocated_size) {
740 if (!new_allocated_size)
741 new_allocated_size = new_size;
743 new_allocated_size += new_allocated_size / 2 + 1;
746 if (new_allocated_size > d->allocated_size) {
747 d->buffer = av_realloc(d->buffer, new_allocated_size);
748 if(d->buffer == NULL)
750 d->allocated_size = new_allocated_size;
752 memcpy(d->buffer + d->pos, buf, buf_size);
754 if (d->pos > d->size)
759 static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
761 unsigned char buf1[4];
764 /* packetized write: output the header */
765 buf1[0] = (buf_size >> 24);
766 buf1[1] = (buf_size >> 16);
767 buf1[2] = (buf_size >> 8);
768 buf1[3] = (buf_size);
769 ret= dyn_buf_write(opaque, buf1, 4);
774 return dyn_buf_write(opaque, buf, buf_size);
777 static offset_t dyn_buf_seek(void *opaque, offset_t offset, int whence)
779 DynBuffer *d = opaque;
781 if (whence == SEEK_CUR)
783 else if (whence == SEEK_END)
785 if (offset < 0 || offset > 0x7fffffffLL)
791 static int url_open_dyn_buf_internal(ByteIOContext **s, int max_packet_size)
794 int io_buffer_size, ret;
797 io_buffer_size = max_packet_size;
799 io_buffer_size = 1024;
801 if(sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
803 d = av_malloc(sizeof(DynBuffer) + io_buffer_size);
806 *s = av_mallocz(sizeof(ByteIOContext));
809 return AVERROR(ENOMEM);
811 d->io_buffer_size = io_buffer_size;
815 d->allocated_size = 0;
816 ret = init_put_byte(*s, d->io_buffer, io_buffer_size,
818 max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
819 max_packet_size ? NULL : dyn_buf_seek);
821 (*s)->max_packet_size = max_packet_size;
829 int url_open_dyn_buf(ByteIOContext **s)
831 return url_open_dyn_buf_internal(s, 0);
834 int url_open_dyn_packet_buf(ByteIOContext **s, int max_packet_size)
836 if (max_packet_size <= 0)
838 return url_open_dyn_buf_internal(s, max_packet_size);
841 int url_close_dyn_buf(ByteIOContext *s, uint8_t **pbuffer)
843 DynBuffer *d = s->opaque;
848 *pbuffer = d->buffer;
854 #endif /* CONFIG_MUXERS || CONFIG_NETWORK */