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 offset_t (*seek)(void *opaque, offset_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 offset_t (*seek)(void *opaque, offset_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 offset_t url_fseek(ByteIOContext *s, offset_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 offset_t res = AVERROR(EPIPE);
162 #if defined(CONFIG_MUXERS) || defined(CONFIG_NETWORK)
167 #endif /* defined(CONFIG_MUXERS) || defined(CONFIG_NETWORK) */
169 s->buf_end = s->buffer;
171 s->buf_ptr = s->buffer;
172 if (!s->seek || (res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
180 void url_fskip(ByteIOContext *s, offset_t offset)
182 url_fseek(s, offset, SEEK_CUR);
185 offset_t url_ftell(ByteIOContext *s)
187 return url_fseek(s, 0, SEEK_CUR);
190 offset_t url_fsize(ByteIOContext *s)
195 return AVERROR(EINVAL);
198 return AVERROR(EPIPE);
199 size = s->seek(s->opaque, 0, AVSEEK_SIZE);
201 if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
204 s->seek(s->opaque, s->pos, SEEK_SET);
209 int url_feof(ByteIOContext *s)
213 return s->eof_reached;
216 int url_ferror(ByteIOContext *s)
223 void put_le32(ByteIOContext *s, unsigned int val)
226 put_byte(s, val >> 8);
227 put_byte(s, val >> 16);
228 put_byte(s, val >> 24);
231 void put_be32(ByteIOContext *s, unsigned int val)
233 put_byte(s, val >> 24);
234 put_byte(s, val >> 16);
235 put_byte(s, val >> 8);
239 void put_strz(ByteIOContext *s, const char *str)
242 put_buffer(s, (const unsigned char *) str, strlen(str) + 1);
247 void put_le64(ByteIOContext *s, uint64_t val)
249 put_le32(s, (uint32_t)(val & 0xffffffff));
250 put_le32(s, (uint32_t)(val >> 32));
253 void put_be64(ByteIOContext *s, uint64_t val)
255 put_be32(s, (uint32_t)(val >> 32));
256 put_be32(s, (uint32_t)(val & 0xffffffff));
259 void put_le16(ByteIOContext *s, unsigned int val)
262 put_byte(s, val >> 8);
265 void put_be16(ByteIOContext *s, unsigned int val)
267 put_byte(s, val >> 8);
271 void put_le24(ByteIOContext *s, unsigned int val)
273 put_le16(s, val & 0xffff);
274 put_byte(s, val >> 16);
277 void put_be24(ByteIOContext *s, unsigned int val)
279 put_be16(s, val >> 8);
283 void put_tag(ByteIOContext *s, const char *tag)
292 static void fill_buffer(ByteIOContext *s)
296 /* no need to do anything if EOF already reached */
300 if(s->update_checksum){
301 if(s->buf_end > s->checksum_ptr)
302 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_end - s->checksum_ptr);
303 s->checksum_ptr= s->buffer;
307 len = s->read_packet(s->opaque, s->buffer, s->buffer_size);
309 /* do not modify buffer if EOF reached so that a seek back can
310 be done without rereading data */
316 s->buf_ptr = s->buffer;
317 s->buf_end = s->buffer + len;
321 unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf, unsigned int len){
322 return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
325 unsigned long get_checksum(ByteIOContext *s){
326 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
327 s->update_checksum= NULL;
331 void init_checksum(ByteIOContext *s, unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len), unsigned long checksum){
332 s->update_checksum= update_checksum;
333 if(s->update_checksum){
334 s->checksum= checksum;
335 s->checksum_ptr= s->buf_ptr;
339 /* XXX: put an inline version */
340 int get_byte(ByteIOContext *s)
342 if (s->buf_ptr < s->buf_end) {
343 return *s->buf_ptr++;
346 if (s->buf_ptr < s->buf_end)
347 return *s->buf_ptr++;
353 int url_fgetc(ByteIOContext *s)
355 if (s->buf_ptr < s->buf_end) {
356 return *s->buf_ptr++;
359 if (s->buf_ptr < s->buf_end)
360 return *s->buf_ptr++;
366 int get_buffer(ByteIOContext *s, unsigned char *buf, int size)
372 len = s->buf_end - s->buf_ptr;
376 if(size > s->buffer_size && !s->update_checksum){
378 len = s->read_packet(s->opaque, buf, size);
380 /* do not modify buffer if EOF reached so that a seek back can
381 be done without rereading data */
390 s->buf_ptr = s->buffer;
391 s->buf_end = s->buffer/* + len*/;
395 len = s->buf_end - s->buf_ptr;
400 memcpy(buf, s->buf_ptr, len);
409 int get_partial_buffer(ByteIOContext *s, unsigned char *buf, int size)
416 len = s->buf_end - s->buf_ptr;
419 len = s->buf_end - s->buf_ptr;
423 memcpy(buf, s->buf_ptr, len);
428 unsigned int get_le16(ByteIOContext *s)
432 val |= get_byte(s) << 8;
436 unsigned int get_le24(ByteIOContext *s)
440 val |= get_byte(s) << 16;
444 unsigned int get_le32(ByteIOContext *s)
448 val |= get_le16(s) << 16;
452 uint64_t get_le64(ByteIOContext *s)
455 val = (uint64_t)get_le32(s);
456 val |= (uint64_t)get_le32(s) << 32;
460 unsigned int get_be16(ByteIOContext *s)
463 val = get_byte(s) << 8;
468 unsigned int get_be24(ByteIOContext *s)
471 val = get_be16(s) << 8;
475 unsigned int get_be32(ByteIOContext *s)
478 val = get_be16(s) << 16;
483 char *get_strz(ByteIOContext *s, char *buf, int maxlen)
488 while ((c = get_byte(s))) {
493 buf[i] = 0; /* Ensure null terminated, but may be truncated */
498 uint64_t get_be64(ByteIOContext *s)
501 val = (uint64_t)get_be32(s) << 32;
502 val |= (uint64_t)get_be32(s);
506 uint64_t ff_get_v(ByteIOContext *bc){
512 val= (val<<7) + (tmp&127);
517 int url_fdopen(ByteIOContext **s, URLContext *h)
520 int buffer_size, max_packet_size;
523 max_packet_size = url_get_max_packet_size(h);
524 if (max_packet_size) {
525 buffer_size = max_packet_size; /* no need to bufferize more than one packet */
527 buffer_size = IO_BUFFER_SIZE;
529 buffer = av_malloc(buffer_size);
531 return AVERROR(ENOMEM);
533 *s = av_mallocz(sizeof(ByteIOContext));
536 return AVERROR(ENOMEM);
539 if (init_put_byte(*s, buffer, buffer_size,
540 (h->flags & URL_WRONLY || h->flags & URL_RDWR), h,
541 url_read, url_write, url_seek) < 0) {
546 (*s)->is_streamed = h->is_streamed;
547 (*s)->max_packet_size = max_packet_size;
549 (*s)->read_pause = (int (*)(void *, int))h->prot->url_read_pause;
550 (*s)->read_seek = (offset_t (*)(void *, int, int64_t, int))h->prot->url_read_seek;
555 int url_setbufsize(ByteIOContext *s, int buf_size)
558 buffer = av_malloc(buf_size);
560 return AVERROR(ENOMEM);
564 s->buffer_size = buf_size;
566 url_resetbuf(s, s->write_flag ? URL_WRONLY : URL_RDONLY);
570 int url_resetbuf(ByteIOContext *s, int flags)
572 URLContext *h = s->opaque;
573 if ((flags & URL_RDWR) || (h && h->flags != flags && !h->flags & URL_RDWR))
574 return AVERROR(EINVAL);
576 if (flags & URL_WRONLY) {
577 s->buf_end = s->buffer + s->buffer_size;
580 s->buf_end = s->buffer;
586 int url_fopen(ByteIOContext **s, const char *filename, int flags)
591 err = url_open(&h, filename, flags);
594 err = url_fdopen(s, h);
602 int url_fclose(ByteIOContext *s)
604 URLContext *h = s->opaque;
611 URLContext *url_fileno(ByteIOContext *s)
617 int url_fprintf(ByteIOContext *s, const char *fmt, ...)
624 ret = vsnprintf(buf, sizeof(buf), fmt, ap);
626 put_buffer(s, buf, strlen(buf));
629 #endif //CONFIG_MUXERS
631 char *url_fgets(ByteIOContext *s, char *buf, int buf_size)
641 if (c == EOF || c == '\n')
643 if ((q - buf) < buf_size - 1)
652 int url_fget_max_packet_size(ByteIOContext *s)
654 return s->max_packet_size;
657 int av_url_read_fpause(ByteIOContext *s, int pause)
660 return AVERROR(ENOSYS);
661 return s->read_pause(s->opaque, pause);
664 offset_t av_url_read_fseek(ByteIOContext *s,
665 int stream_index, int64_t timestamp, int flags)
667 URLContext *h = s->opaque;
670 return AVERROR(ENOSYS);
671 ret = s->read_seek(h, stream_index, timestamp, flags);
673 s->buf_ptr = s->buf_end; // Flush buffer
674 s->pos = s->seek(h, 0, SEEK_CUR);
679 /* url_open_dyn_buf and url_close_dyn_buf are used in rtp.c to send a response
680 * back to the server even if CONFIG_MUXERS is not set. */
681 #if defined(CONFIG_MUXERS) || defined(CONFIG_NETWORK)
682 /* buffer handling */
683 int url_open_buf(ByteIOContext **s, uint8_t *buf, int buf_size, int flags)
686 *s = av_mallocz(sizeof(ByteIOContext));
688 return AVERROR(ENOMEM);
689 ret = init_put_byte(*s, buf, buf_size,
690 (flags & URL_WRONLY || flags & URL_RDWR),
691 NULL, NULL, NULL, NULL);
697 int url_close_buf(ByteIOContext *s)
700 return s->buf_ptr - s->buffer;
703 /* output in a dynamic buffer */
705 typedef struct DynBuffer {
706 int pos, size, allocated_size;
709 uint8_t io_buffer[1];
712 static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
714 DynBuffer *d = opaque;
715 int new_size, new_allocated_size;
717 /* reallocate buffer if needed */
718 new_size = d->pos + buf_size;
719 new_allocated_size = d->allocated_size;
720 if(new_size < d->pos || new_size > INT_MAX/2)
722 while (new_size > new_allocated_size) {
723 if (!new_allocated_size)
724 new_allocated_size = new_size;
726 new_allocated_size += new_allocated_size / 2 + 1;
729 if (new_allocated_size > d->allocated_size) {
730 d->buffer = av_realloc(d->buffer, new_allocated_size);
731 if(d->buffer == NULL)
733 d->allocated_size = new_allocated_size;
735 memcpy(d->buffer + d->pos, buf, buf_size);
737 if (d->pos > d->size)
742 static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
744 unsigned char buf1[4];
747 /* packetized write: output the header */
748 buf1[0] = (buf_size >> 24);
749 buf1[1] = (buf_size >> 16);
750 buf1[2] = (buf_size >> 8);
751 buf1[3] = (buf_size);
752 ret= dyn_buf_write(opaque, buf1, 4);
757 return dyn_buf_write(opaque, buf, buf_size);
760 static offset_t dyn_buf_seek(void *opaque, offset_t offset, int whence)
762 DynBuffer *d = opaque;
764 if (whence == SEEK_CUR)
766 else if (whence == SEEK_END)
768 if (offset < 0 || offset > 0x7fffffffLL)
774 static int url_open_dyn_buf_internal(ByteIOContext **s, int max_packet_size)
777 int io_buffer_size, ret;
780 io_buffer_size = max_packet_size;
782 io_buffer_size = 1024;
784 if(sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
786 d = av_malloc(sizeof(DynBuffer) + io_buffer_size);
789 *s = av_mallocz(sizeof(ByteIOContext));
792 return AVERROR(ENOMEM);
794 d->io_buffer_size = io_buffer_size;
798 d->allocated_size = 0;
799 ret = init_put_byte(*s, d->io_buffer, io_buffer_size,
801 max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
802 max_packet_size ? NULL : dyn_buf_seek);
804 (*s)->max_packet_size = max_packet_size;
812 int url_open_dyn_buf(ByteIOContext **s)
814 return url_open_dyn_buf_internal(s, 0);
817 int url_open_dyn_packet_buf(ByteIOContext **s, int max_packet_size)
819 if (max_packet_size <= 0)
821 return url_open_dyn_buf_internal(s, max_packet_size);
824 int url_close_dyn_buf(ByteIOContext *s, uint8_t **pbuffer)
826 DynBuffer *d = s->opaque;
831 *pbuffer = d->buffer;
837 #endif /* CONFIG_MUXERS || CONFIG_NETWORK */