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"
23 #include "libavutil/intreadwrite.h"
28 #define IO_BUFFER_SIZE 32768
30 static void fill_buffer(ByteIOContext *s);
32 int init_put_byte(ByteIOContext *s,
33 unsigned char *buffer,
37 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
38 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
39 int64_t (*seek)(void *opaque, int64_t offset, int whence))
42 s->buffer_size = buffer_size;
45 url_resetbuf(s, write_flag ? URL_WRONLY : URL_RDONLY);
46 s->write_packet = write_packet;
47 s->read_packet = read_packet;
54 s->max_packet_size = 0;
55 s->update_checksum= NULL;
56 if(!read_packet && !write_flag){
58 s->buf_end = s->buffer + buffer_size;
65 ByteIOContext *av_alloc_put_byte(
66 unsigned char *buffer,
70 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
71 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
72 int64_t (*seek)(void *opaque, int64_t offset, int whence))
74 ByteIOContext *s = av_mallocz(sizeof(ByteIOContext));
75 init_put_byte(s, buffer, buffer_size, write_flag, opaque,
76 read_packet, write_packet, seek);
80 static void flush_buffer(ByteIOContext *s)
82 if (s->buf_ptr > s->buffer) {
83 if (s->write_packet && !s->error){
84 int ret= s->write_packet(s->opaque, s->buffer, s->buf_ptr - s->buffer);
89 if(s->update_checksum){
90 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
91 s->checksum_ptr= s->buffer;
93 s->pos += s->buf_ptr - s->buffer;
95 s->buf_ptr = s->buffer;
98 void put_byte(ByteIOContext *s, int b)
101 if (s->buf_ptr >= s->buf_end)
105 void put_buffer(ByteIOContext *s, const unsigned char *buf, int size)
108 int len = FFMIN(s->buf_end - s->buf_ptr, size);
109 memcpy(s->buf_ptr, buf, len);
112 if (s->buf_ptr >= s->buf_end)
120 void put_flush_packet(ByteIOContext *s)
126 int64_t url_fseek(ByteIOContext *s, int64_t offset, int whence)
132 return AVERROR(EINVAL);
134 pos = s->pos - (s->write_flag ? 0 : (s->buf_end - s->buffer));
136 if (whence != SEEK_CUR && whence != SEEK_SET)
137 return AVERROR(EINVAL);
139 if (whence == SEEK_CUR) {
140 offset1 = pos + (s->buf_ptr - s->buffer);
145 offset1 = offset - pos;
146 if (!s->must_flush &&
147 offset1 >= 0 && offset1 <= (s->buf_end - s->buffer)) {
148 /* can do the seek inside the buffer */
149 s->buf_ptr = s->buffer + offset1;
150 } else if(s->is_streamed && !s->write_flag &&
151 offset1 >= 0 && offset1 < (s->buf_end - s->buffer) + (1<<16)){
152 while(s->pos < offset && !s->eof_reached)
155 return AVERROR(EPIPE);
156 s->buf_ptr = s->buf_end + offset - s->pos;
158 int64_t res = AVERROR(EPIPE);
160 #if CONFIG_MUXERS || CONFIG_NETWORK
165 #endif /* CONFIG_MUXERS || CONFIG_NETWORK */
166 if (!s->seek || (res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
169 s->buf_end = s->buffer;
170 s->buf_ptr = s->buffer;
177 void url_fskip(ByteIOContext *s, int64_t offset)
179 url_fseek(s, offset, SEEK_CUR);
182 int64_t url_ftell(ByteIOContext *s)
184 return url_fseek(s, 0, SEEK_CUR);
187 int64_t url_fsize(ByteIOContext *s)
192 return AVERROR(EINVAL);
195 return AVERROR(EPIPE);
196 size = s->seek(s->opaque, 0, AVSEEK_SIZE);
198 if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
201 s->seek(s->opaque, s->pos, SEEK_SET);
206 int url_feof(ByteIOContext *s)
210 return s->eof_reached;
213 int url_ferror(ByteIOContext *s)
220 void put_le32(ByteIOContext *s, unsigned int val)
223 put_byte(s, val >> 8);
224 put_byte(s, val >> 16);
225 put_byte(s, val >> 24);
228 void put_be32(ByteIOContext *s, unsigned int val)
230 put_byte(s, val >> 24);
231 put_byte(s, val >> 16);
232 put_byte(s, val >> 8);
236 void put_strz(ByteIOContext *s, const char *str)
239 put_buffer(s, (const unsigned char *) str, strlen(str) + 1);
244 void put_le64(ByteIOContext *s, uint64_t val)
246 put_le32(s, (uint32_t)(val & 0xffffffff));
247 put_le32(s, (uint32_t)(val >> 32));
250 void put_be64(ByteIOContext *s, uint64_t val)
252 put_be32(s, (uint32_t)(val >> 32));
253 put_be32(s, (uint32_t)(val & 0xffffffff));
256 void put_le16(ByteIOContext *s, unsigned int val)
259 put_byte(s, val >> 8);
262 void put_be16(ByteIOContext *s, unsigned int val)
264 put_byte(s, val >> 8);
268 void put_le24(ByteIOContext *s, unsigned int val)
270 put_le16(s, val & 0xffff);
271 put_byte(s, val >> 16);
274 void put_be24(ByteIOContext *s, unsigned int val)
276 put_be16(s, val >> 8);
280 void put_tag(ByteIOContext *s, const char *tag)
289 static void fill_buffer(ByteIOContext *s)
291 uint8_t *dst= !s->max_packet_size && s->buf_end - s->buffer < s->buffer_size ? s->buf_ptr : s->buffer;
292 int len= s->buffer_size - (dst - s->buffer);
294 assert(s->buf_ptr == s->buf_end);
296 /* no need to do anything if EOF already reached */
300 if(s->update_checksum && dst == s->buffer){
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, dst, len);
311 /* do not modify buffer if EOF reached so that a seek back can
312 be done without rereading data */
319 s->buf_end = dst + len;
323 unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
326 return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
329 unsigned long get_checksum(ByteIOContext *s)
331 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
332 s->update_checksum= NULL;
336 void init_checksum(ByteIOContext *s,
337 unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
338 unsigned long checksum)
340 s->update_checksum= update_checksum;
341 if(s->update_checksum){
342 s->checksum= checksum;
343 s->checksum_ptr= s->buf_ptr;
347 /* XXX: put an inline version */
348 int get_byte(ByteIOContext *s)
350 if (s->buf_ptr < s->buf_end) {
351 return *s->buf_ptr++;
354 if (s->buf_ptr < s->buf_end)
355 return *s->buf_ptr++;
361 int url_fgetc(ByteIOContext *s)
363 if (s->buf_ptr < s->buf_end) {
364 return *s->buf_ptr++;
367 if (s->buf_ptr < s->buf_end)
368 return *s->buf_ptr++;
374 int get_buffer(ByteIOContext *s, unsigned char *buf, int size)
380 len = s->buf_end - s->buf_ptr;
384 if(size > s->buffer_size && !s->update_checksum){
386 len = s->read_packet(s->opaque, buf, size);
388 /* do not modify buffer if EOF reached so that a seek back can
389 be done without rereading data */
398 s->buf_ptr = s->buffer;
399 s->buf_end = s->buffer/* + len*/;
403 len = s->buf_end - s->buf_ptr;
408 memcpy(buf, s->buf_ptr, len);
415 if (url_ferror(s)) return url_ferror(s);
416 if (url_feof(s)) return AVERROR_EOF;
421 int get_partial_buffer(ByteIOContext *s, unsigned char *buf, int size)
428 len = s->buf_end - s->buf_ptr;
431 len = s->buf_end - s->buf_ptr;
435 memcpy(buf, s->buf_ptr, len);
438 if (url_ferror(s)) return url_ferror(s);
439 if (url_feof(s)) return AVERROR_EOF;
444 unsigned int get_le16(ByteIOContext *s)
448 val |= get_byte(s) << 8;
452 unsigned int get_le24(ByteIOContext *s)
456 val |= get_byte(s) << 16;
460 unsigned int get_le32(ByteIOContext *s)
464 val |= get_le16(s) << 16;
468 uint64_t get_le64(ByteIOContext *s)
471 val = (uint64_t)get_le32(s);
472 val |= (uint64_t)get_le32(s) << 32;
476 unsigned int get_be16(ByteIOContext *s)
479 val = get_byte(s) << 8;
484 unsigned int get_be24(ByteIOContext *s)
487 val = get_be16(s) << 8;
491 unsigned int get_be32(ByteIOContext *s)
494 val = get_be16(s) << 16;
499 char *get_strz(ByteIOContext *s, char *buf, int maxlen)
504 while ((c = get_byte(s))) {
509 buf[i] = 0; /* Ensure null terminated, but may be truncated */
514 uint64_t get_be64(ByteIOContext *s)
517 val = (uint64_t)get_be32(s) << 32;
518 val |= (uint64_t)get_be32(s);
522 uint64_t ff_get_v(ByteIOContext *bc){
528 val= (val<<7) + (tmp&127);
533 int url_fdopen(ByteIOContext **s, URLContext *h)
536 int buffer_size, max_packet_size;
539 max_packet_size = url_get_max_packet_size(h);
540 if (max_packet_size) {
541 buffer_size = max_packet_size; /* no need to bufferize more than one packet */
543 buffer_size = IO_BUFFER_SIZE;
545 buffer = av_malloc(buffer_size);
547 return AVERROR(ENOMEM);
549 *s = av_mallocz(sizeof(ByteIOContext));
552 return AVERROR(ENOMEM);
555 if (init_put_byte(*s, buffer, buffer_size,
556 (h->flags & URL_WRONLY || h->flags & URL_RDWR), h,
557 url_read, url_write, url_seek) < 0) {
562 (*s)->is_streamed = h->is_streamed;
563 (*s)->max_packet_size = max_packet_size;
565 (*s)->read_pause = (int (*)(void *, int))h->prot->url_read_pause;
566 (*s)->read_seek = (int64_t (*)(void *, int, int64_t, int))h->prot->url_read_seek;
571 int url_setbufsize(ByteIOContext *s, int buf_size)
574 buffer = av_malloc(buf_size);
576 return AVERROR(ENOMEM);
580 s->buffer_size = buf_size;
582 url_resetbuf(s, s->write_flag ? URL_WRONLY : URL_RDONLY);
586 int url_resetbuf(ByteIOContext *s, int flags)
588 URLContext *h = s->opaque;
589 if ((flags & URL_RDWR) || (h && h->flags != flags && !h->flags & URL_RDWR))
590 return AVERROR(EINVAL);
592 if (flags & URL_WRONLY) {
593 s->buf_end = s->buffer + s->buffer_size;
596 s->buf_end = s->buffer;
602 int url_fopen(ByteIOContext **s, const char *filename, int flags)
607 err = url_open(&h, filename, flags);
610 err = url_fdopen(s, h);
618 int url_fclose(ByteIOContext *s)
620 URLContext *h = s->opaque;
627 URLContext *url_fileno(ByteIOContext *s)
633 int url_fprintf(ByteIOContext *s, const char *fmt, ...)
640 ret = vsnprintf(buf, sizeof(buf), fmt, ap);
642 put_buffer(s, buf, strlen(buf));
645 #endif //CONFIG_MUXERS
647 char *url_fgets(ByteIOContext *s, char *buf, int buf_size)
657 if (c == EOF || c == '\n')
659 if ((q - buf) < buf_size - 1)
668 int url_fget_max_packet_size(ByteIOContext *s)
670 return s->max_packet_size;
673 int av_url_read_fpause(ByteIOContext *s, int pause)
676 return AVERROR(ENOSYS);
677 return s->read_pause(s->opaque, pause);
680 int64_t av_url_read_fseek(ByteIOContext *s, int stream_index,
681 int64_t timestamp, int flags)
683 URLContext *h = s->opaque;
686 return AVERROR(ENOSYS);
687 ret = s->read_seek(h, stream_index, timestamp, flags);
689 s->buf_ptr = s->buf_end; // Flush buffer
690 s->pos = s->seek(h, 0, SEEK_CUR);
695 /* url_open_dyn_buf and url_close_dyn_buf are used in rtp.c to send a response
696 * back to the server even if CONFIG_MUXERS is false. */
697 #if CONFIG_MUXERS || CONFIG_NETWORK
698 /* buffer handling */
699 int url_open_buf(ByteIOContext **s, uint8_t *buf, int buf_size, int flags)
702 *s = av_mallocz(sizeof(ByteIOContext));
704 return AVERROR(ENOMEM);
705 ret = init_put_byte(*s, buf, buf_size,
706 (flags & URL_WRONLY || flags & URL_RDWR),
707 NULL, NULL, NULL, NULL);
713 int url_close_buf(ByteIOContext *s)
716 return s->buf_ptr - s->buffer;
719 /* output in a dynamic buffer */
721 typedef struct DynBuffer {
722 int pos, size, allocated_size;
725 uint8_t io_buffer[1];
728 static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
730 DynBuffer *d = opaque;
731 unsigned new_size, new_allocated_size;
733 /* reallocate buffer if needed */
734 new_size = d->pos + buf_size;
735 new_allocated_size = d->allocated_size;
736 if(new_size < d->pos || new_size > INT_MAX/2)
738 while (new_size > new_allocated_size) {
739 if (!new_allocated_size)
740 new_allocated_size = new_size;
742 new_allocated_size += new_allocated_size / 2 + 1;
745 if (new_allocated_size > d->allocated_size) {
746 d->buffer = av_realloc(d->buffer, new_allocated_size);
747 if(d->buffer == NULL)
748 return AVERROR(ENOMEM);
749 d->allocated_size = new_allocated_size;
751 memcpy(d->buffer + d->pos, buf, buf_size);
753 if (d->pos > d->size)
758 static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
760 unsigned char buf1[4];
763 /* packetized write: output the header */
764 AV_WB32(buf1, buf_size);
765 ret= dyn_buf_write(opaque, buf1, 4);
770 return dyn_buf_write(opaque, buf, buf_size);
773 static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence)
775 DynBuffer *d = opaque;
777 if (whence == SEEK_CUR)
779 else if (whence == SEEK_END)
781 if (offset < 0 || offset > 0x7fffffffLL)
787 static int url_open_dyn_buf_internal(ByteIOContext **s, int max_packet_size)
791 unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024;
793 if(sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
795 d = av_mallocz(sizeof(DynBuffer) + io_buffer_size);
797 return AVERROR(ENOMEM);
798 *s = av_mallocz(sizeof(ByteIOContext));
801 return AVERROR(ENOMEM);
803 d->io_buffer_size = io_buffer_size;
804 ret = init_put_byte(*s, d->io_buffer, io_buffer_size,
806 max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
807 max_packet_size ? NULL : dyn_buf_seek);
809 (*s)->max_packet_size = max_packet_size;
817 int url_open_dyn_buf(ByteIOContext **s)
819 return url_open_dyn_buf_internal(s, 0);
822 int url_open_dyn_packet_buf(ByteIOContext **s, int max_packet_size)
824 if (max_packet_size <= 0)
826 return url_open_dyn_buf_internal(s, max_packet_size);
829 int url_close_dyn_buf(ByteIOContext *s, uint8_t **pbuffer)
831 DynBuffer *d = s->opaque;
836 *pbuffer = d->buffer;
842 #endif /* CONFIG_MUXERS || CONFIG_NETWORK */