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
22 #include "libavutil/crc.h"
27 #define IO_BUFFER_SIZE 32768
29 static void fill_buffer(ByteIOContext *s);
31 int init_put_byte(ByteIOContext *s,
32 unsigned char *buffer,
36 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
37 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
38 int64_t (*seek)(void *opaque, int64_t offset, int whence))
41 s->buffer_size = buffer_size;
43 url_resetbuf(s, write_flag ? URL_WRONLY : URL_RDONLY);
45 s->write_packet = write_packet;
46 s->read_packet = read_packet;
53 s->max_packet_size = 0;
54 s->update_checksum= NULL;
55 if(!read_packet && !write_flag){
57 s->buf_end = s->buffer + buffer_size;
64 ByteIOContext *av_alloc_put_byte(
65 unsigned char *buffer,
69 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
70 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
71 int64_t (*seek)(void *opaque, int64_t offset, int whence)) {
72 ByteIOContext *s = av_mallocz(sizeof(ByteIOContext));
73 init_put_byte(s, buffer, buffer_size, write_flag, opaque,
74 read_packet, write_packet, seek);
78 static void flush_buffer(ByteIOContext *s)
80 if (s->buf_ptr > s->buffer) {
81 if (s->write_packet && !s->error){
82 int ret= s->write_packet(s->opaque, s->buffer, s->buf_ptr - s->buffer);
87 if(s->update_checksum){
88 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
89 s->checksum_ptr= s->buffer;
91 s->pos += s->buf_ptr - s->buffer;
93 s->buf_ptr = s->buffer;
96 void put_byte(ByteIOContext *s, int b)
99 if (s->buf_ptr >= s->buf_end)
103 void put_buffer(ByteIOContext *s, const unsigned char *buf, int size)
108 len = (s->buf_end - s->buf_ptr);
111 memcpy(s->buf_ptr, buf, len);
114 if (s->buf_ptr >= s->buf_end)
122 void put_flush_packet(ByteIOContext *s)
128 int64_t url_fseek(ByteIOContext *s, int64_t offset, int whence)
134 return AVERROR(EINVAL);
136 pos = s->pos - (s->write_flag ? 0 : (s->buf_end - s->buffer));
138 if (whence != SEEK_CUR && whence != SEEK_SET)
139 return AVERROR(EINVAL);
141 if (whence == SEEK_CUR) {
142 offset1 = pos + (s->buf_ptr - s->buffer);
147 offset1 = offset - pos;
148 if (!s->must_flush &&
149 offset1 >= 0 && offset1 < (s->buf_end - s->buffer)) {
150 /* can do the seek inside the buffer */
151 s->buf_ptr = s->buffer + offset1;
152 } else if(s->is_streamed && !s->write_flag &&
153 offset1 >= 0 && offset1 < (s->buf_end - s->buffer) + (1<<16)){
154 while(s->pos < offset && !s->eof_reached)
157 return AVERROR(EPIPE);
158 s->buf_ptr = s->buf_end + offset - s->pos;
160 int64_t res = AVERROR(EPIPE);
162 #if defined(CONFIG_MUXERS) || defined(CONFIG_NETWORK)
167 #endif /* defined(CONFIG_MUXERS) || defined(CONFIG_NETWORK) */
168 if (!s->seek || (res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
171 s->buf_end = s->buffer;
172 s->buf_ptr = s->buffer;
179 void url_fskip(ByteIOContext *s, int64_t offset)
181 url_fseek(s, offset, SEEK_CUR);
184 int64_t url_ftell(ByteIOContext *s)
186 return url_fseek(s, 0, SEEK_CUR);
189 int64_t url_fsize(ByteIOContext *s)
194 return AVERROR(EINVAL);
197 return AVERROR(EPIPE);
198 size = s->seek(s->opaque, 0, AVSEEK_SIZE);
200 if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
203 s->seek(s->opaque, s->pos, SEEK_SET);
208 int url_feof(ByteIOContext *s)
212 return s->eof_reached;
215 int url_ferror(ByteIOContext *s)
222 void put_le32(ByteIOContext *s, unsigned int val)
225 put_byte(s, val >> 8);
226 put_byte(s, val >> 16);
227 put_byte(s, val >> 24);
230 void put_be32(ByteIOContext *s, unsigned int val)
232 put_byte(s, val >> 24);
233 put_byte(s, val >> 16);
234 put_byte(s, val >> 8);
238 void put_strz(ByteIOContext *s, const char *str)
241 put_buffer(s, (const unsigned char *) str, strlen(str) + 1);
246 void put_le64(ByteIOContext *s, uint64_t val)
248 put_le32(s, (uint32_t)(val & 0xffffffff));
249 put_le32(s, (uint32_t)(val >> 32));
252 void put_be64(ByteIOContext *s, uint64_t val)
254 put_be32(s, (uint32_t)(val >> 32));
255 put_be32(s, (uint32_t)(val & 0xffffffff));
258 void put_le16(ByteIOContext *s, unsigned int val)
261 put_byte(s, val >> 8);
264 void put_be16(ByteIOContext *s, unsigned int val)
266 put_byte(s, val >> 8);
270 void put_le24(ByteIOContext *s, unsigned int val)
272 put_le16(s, val & 0xffff);
273 put_byte(s, val >> 16);
276 void put_be24(ByteIOContext *s, unsigned int val)
278 put_be16(s, val >> 8);
282 void put_tag(ByteIOContext *s, const char *tag)
291 static void fill_buffer(ByteIOContext *s)
293 uint8_t *dst= s->buf_end - s->buffer < s->buffer_size ? s->buf_ptr : s->buffer;
294 int len= s->buffer_size - (dst - s->buffer);
296 assert(s->buf_ptr == s->buf_end);
298 /* no need to do anything if EOF already reached */
302 if(s->update_checksum && dst == s->buffer){
303 if(s->buf_end > s->checksum_ptr)
304 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_end - s->checksum_ptr);
305 s->checksum_ptr= s->buffer;
309 len = s->read_packet(s->opaque, dst, len);
313 /* do not modify buffer if EOF reached so that a seek back can
314 be done without rereading data */
321 s->buf_end = dst + len;
325 unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf, unsigned int len){
326 return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
329 unsigned long get_checksum(ByteIOContext *s){
330 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
331 s->update_checksum= NULL;
335 void init_checksum(ByteIOContext *s, unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len), unsigned long checksum){
336 s->update_checksum= update_checksum;
337 if(s->update_checksum){
338 s->checksum= checksum;
339 s->checksum_ptr= s->buf_ptr;
343 /* XXX: put an inline version */
344 int get_byte(ByteIOContext *s)
346 if (s->buf_ptr < s->buf_end) {
347 return *s->buf_ptr++;
350 if (s->buf_ptr < s->buf_end)
351 return *s->buf_ptr++;
357 int url_fgetc(ByteIOContext *s)
359 if (s->buf_ptr < s->buf_end) {
360 return *s->buf_ptr++;
363 if (s->buf_ptr < s->buf_end)
364 return *s->buf_ptr++;
370 int get_buffer(ByteIOContext *s, unsigned char *buf, int size)
376 len = s->buf_end - s->buf_ptr;
380 if(size > s->buffer_size && !s->update_checksum){
382 len = s->read_packet(s->opaque, buf, size);
384 /* do not modify buffer if EOF reached so that a seek back can
385 be done without rereading data */
394 s->buf_ptr = s->buffer;
395 s->buf_end = s->buffer/* + len*/;
399 len = s->buf_end - s->buf_ptr;
404 memcpy(buf, s->buf_ptr, len);
413 int get_partial_buffer(ByteIOContext *s, unsigned char *buf, int size)
420 len = s->buf_end - s->buf_ptr;
423 len = s->buf_end - s->buf_ptr;
427 memcpy(buf, s->buf_ptr, len);
432 unsigned int get_le16(ByteIOContext *s)
436 val |= get_byte(s) << 8;
440 unsigned int get_le24(ByteIOContext *s)
444 val |= get_byte(s) << 16;
448 unsigned int get_le32(ByteIOContext *s)
452 val |= get_le16(s) << 16;
456 uint64_t get_le64(ByteIOContext *s)
459 val = (uint64_t)get_le32(s);
460 val |= (uint64_t)get_le32(s) << 32;
464 unsigned int get_be16(ByteIOContext *s)
467 val = get_byte(s) << 8;
472 unsigned int get_be24(ByteIOContext *s)
475 val = get_be16(s) << 8;
479 unsigned int get_be32(ByteIOContext *s)
482 val = get_be16(s) << 16;
487 char *get_strz(ByteIOContext *s, char *buf, int maxlen)
492 while ((c = get_byte(s))) {
497 buf[i] = 0; /* Ensure null terminated, but may be truncated */
502 uint64_t get_be64(ByteIOContext *s)
505 val = (uint64_t)get_be32(s) << 32;
506 val |= (uint64_t)get_be32(s);
510 uint64_t ff_get_v(ByteIOContext *bc){
516 val= (val<<7) + (tmp&127);
521 int url_fdopen(ByteIOContext **s, URLContext *h)
524 int buffer_size, max_packet_size;
527 max_packet_size = url_get_max_packet_size(h);
528 if (max_packet_size) {
529 buffer_size = max_packet_size; /* no need to bufferize more than one packet */
531 buffer_size = IO_BUFFER_SIZE;
533 buffer = av_malloc(buffer_size);
535 return AVERROR(ENOMEM);
537 *s = av_mallocz(sizeof(ByteIOContext));
540 return AVERROR(ENOMEM);
543 if (init_put_byte(*s, buffer, buffer_size,
544 (h->flags & URL_WRONLY || h->flags & URL_RDWR), h,
545 url_read, url_write, url_seek) < 0) {
550 (*s)->is_streamed = h->is_streamed;
551 (*s)->max_packet_size = max_packet_size;
553 (*s)->read_pause = (int (*)(void *, int))h->prot->url_read_pause;
554 (*s)->read_seek = (int64_t (*)(void *, int, int64_t, int))h->prot->url_read_seek;
559 int url_setbufsize(ByteIOContext *s, int buf_size)
562 buffer = av_malloc(buf_size);
564 return AVERROR(ENOMEM);
568 s->buffer_size = buf_size;
570 url_resetbuf(s, s->write_flag ? URL_WRONLY : URL_RDONLY);
574 int url_resetbuf(ByteIOContext *s, int flags)
576 URLContext *h = s->opaque;
577 if ((flags & URL_RDWR) || (h && h->flags != flags && !h->flags & URL_RDWR))
578 return AVERROR(EINVAL);
580 if (flags & URL_WRONLY) {
581 s->buf_end = s->buffer + s->buffer_size;
584 s->buf_end = s->buffer;
590 int url_fopen(ByteIOContext **s, const char *filename, int flags)
595 err = url_open(&h, filename, flags);
598 err = url_fdopen(s, h);
606 int url_fclose(ByteIOContext *s)
608 URLContext *h = s->opaque;
615 URLContext *url_fileno(ByteIOContext *s)
621 int url_fprintf(ByteIOContext *s, const char *fmt, ...)
628 ret = vsnprintf(buf, sizeof(buf), fmt, ap);
630 put_buffer(s, buf, strlen(buf));
633 #endif //CONFIG_MUXERS
635 char *url_fgets(ByteIOContext *s, char *buf, int buf_size)
645 if (c == EOF || c == '\n')
647 if ((q - buf) < buf_size - 1)
656 int url_fget_max_packet_size(ByteIOContext *s)
658 return s->max_packet_size;
661 int av_url_read_fpause(ByteIOContext *s, int pause)
664 return AVERROR(ENOSYS);
665 return s->read_pause(s->opaque, pause);
668 int64_t av_url_read_fseek(ByteIOContext *s,
669 int stream_index, int64_t timestamp, int flags)
671 URLContext *h = s->opaque;
674 return AVERROR(ENOSYS);
675 ret = s->read_seek(h, stream_index, timestamp, flags);
677 s->buf_ptr = s->buf_end; // Flush buffer
678 s->pos = s->seek(h, 0, SEEK_CUR);
683 /* url_open_dyn_buf and url_close_dyn_buf are used in rtp.c to send a response
684 * back to the server even if CONFIG_MUXERS is not set. */
685 #if defined(CONFIG_MUXERS) || defined(CONFIG_NETWORK)
686 /* buffer handling */
687 int url_open_buf(ByteIOContext **s, uint8_t *buf, int buf_size, int flags)
690 *s = av_mallocz(sizeof(ByteIOContext));
692 return AVERROR(ENOMEM);
693 ret = init_put_byte(*s, buf, buf_size,
694 (flags & URL_WRONLY || flags & URL_RDWR),
695 NULL, NULL, NULL, NULL);
701 int url_close_buf(ByteIOContext *s)
704 return s->buf_ptr - s->buffer;
707 /* output in a dynamic buffer */
709 typedef struct DynBuffer {
710 int pos, size, allocated_size;
713 uint8_t io_buffer[1];
716 static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
718 DynBuffer *d = opaque;
719 unsigned new_size, new_allocated_size;
721 /* reallocate buffer if needed */
722 new_size = d->pos + buf_size;
723 new_allocated_size = d->allocated_size;
724 if(new_size < d->pos || new_size > INT_MAX/2)
726 while (new_size > new_allocated_size) {
727 if (!new_allocated_size)
728 new_allocated_size = new_size;
730 new_allocated_size += new_allocated_size / 2 + 1;
733 if (new_allocated_size > d->allocated_size) {
734 d->buffer = av_realloc(d->buffer, new_allocated_size);
735 if(d->buffer == NULL)
737 d->allocated_size = new_allocated_size;
739 memcpy(d->buffer + d->pos, buf, buf_size);
741 if (d->pos > d->size)
746 static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
748 unsigned char buf1[4];
751 /* packetized write: output the header */
752 buf1[0] = (buf_size >> 24);
753 buf1[1] = (buf_size >> 16);
754 buf1[2] = (buf_size >> 8);
755 buf1[3] = (buf_size);
756 ret= dyn_buf_write(opaque, buf1, 4);
761 return dyn_buf_write(opaque, buf, buf_size);
764 static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence)
766 DynBuffer *d = opaque;
768 if (whence == SEEK_CUR)
770 else if (whence == SEEK_END)
772 if (offset < 0 || offset > 0x7fffffffLL)
778 static int url_open_dyn_buf_internal(ByteIOContext **s, int max_packet_size)
781 int io_buffer_size, ret;
784 io_buffer_size = max_packet_size;
786 io_buffer_size = 1024;
788 if(sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
790 d = av_malloc(sizeof(DynBuffer) + io_buffer_size);
793 *s = av_mallocz(sizeof(ByteIOContext));
796 return AVERROR(ENOMEM);
798 d->io_buffer_size = io_buffer_size;
802 d->allocated_size = 0;
803 ret = init_put_byte(*s, d->io_buffer, io_buffer_size,
805 max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
806 max_packet_size ? NULL : dyn_buf_seek);
808 (*s)->max_packet_size = max_packet_size;
816 int url_open_dyn_buf(ByteIOContext **s)
818 return url_open_dyn_buf_internal(s, 0);
821 int url_open_dyn_packet_buf(ByteIOContext **s, int max_packet_size)
823 if (max_packet_size <= 0)
825 return url_open_dyn_buf_internal(s, max_packet_size);
828 int url_close_dyn_buf(ByteIOContext *s, uint8_t **pbuffer)
830 DynBuffer *d = s->opaque;
835 *pbuffer = d->buffer;
841 #endif /* CONFIG_MUXERS || CONFIG_NETWORK */