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)
110 len = (s->buf_end - s->buf_ptr);
113 memcpy(s->buf_ptr, buf, len);
116 if (s->buf_ptr >= s->buf_end)
124 void put_flush_packet(ByteIOContext *s)
130 int64_t url_fseek(ByteIOContext *s, int64_t offset, int whence)
136 return AVERROR(EINVAL);
138 pos = s->pos - (s->write_flag ? 0 : (s->buf_end - s->buffer));
140 if (whence != SEEK_CUR && whence != SEEK_SET)
141 return AVERROR(EINVAL);
143 if (whence == SEEK_CUR) {
144 offset1 = pos + (s->buf_ptr - s->buffer);
149 offset1 = offset - pos;
150 if (!s->must_flush &&
151 offset1 >= 0 && offset1 <= (s->buf_end - s->buffer)) {
152 /* can do the seek inside the buffer */
153 s->buf_ptr = s->buffer + offset1;
154 } else if(s->is_streamed && !s->write_flag &&
155 offset1 >= 0 && offset1 < (s->buf_end - s->buffer) + (1<<16)){
156 while(s->pos < offset && !s->eof_reached)
159 return AVERROR(EPIPE);
160 s->buf_ptr = s->buf_end + offset - s->pos;
162 int64_t res = AVERROR(EPIPE);
164 #if CONFIG_MUXERS || CONFIG_NETWORK
169 #endif /* CONFIG_MUXERS || CONFIG_NETWORK */
170 if (!s->seek || (res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
173 s->buf_end = s->buffer;
174 s->buf_ptr = s->buffer;
181 void url_fskip(ByteIOContext *s, int64_t offset)
183 url_fseek(s, offset, SEEK_CUR);
186 int64_t url_ftell(ByteIOContext *s)
188 return url_fseek(s, 0, SEEK_CUR);
191 int64_t url_fsize(ByteIOContext *s)
196 return AVERROR(EINVAL);
199 return AVERROR(EPIPE);
200 size = s->seek(s->opaque, 0, AVSEEK_SIZE);
202 if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
205 s->seek(s->opaque, s->pos, SEEK_SET);
210 int url_feof(ByteIOContext *s)
214 return s->eof_reached;
217 int url_ferror(ByteIOContext *s)
224 void put_le32(ByteIOContext *s, unsigned int val)
227 put_byte(s, val >> 8);
228 put_byte(s, val >> 16);
229 put_byte(s, val >> 24);
232 void put_be32(ByteIOContext *s, unsigned int val)
234 put_byte(s, val >> 24);
235 put_byte(s, val >> 16);
236 put_byte(s, val >> 8);
240 void put_strz(ByteIOContext *s, const char *str)
243 put_buffer(s, (const unsigned char *) str, strlen(str) + 1);
248 void put_le64(ByteIOContext *s, uint64_t val)
250 put_le32(s, (uint32_t)(val & 0xffffffff));
251 put_le32(s, (uint32_t)(val >> 32));
254 void put_be64(ByteIOContext *s, uint64_t val)
256 put_be32(s, (uint32_t)(val >> 32));
257 put_be32(s, (uint32_t)(val & 0xffffffff));
260 void put_le16(ByteIOContext *s, unsigned int val)
263 put_byte(s, val >> 8);
266 void put_be16(ByteIOContext *s, unsigned int val)
268 put_byte(s, val >> 8);
272 void put_le24(ByteIOContext *s, unsigned int val)
274 put_le16(s, val & 0xffff);
275 put_byte(s, val >> 16);
278 void put_be24(ByteIOContext *s, unsigned int val)
280 put_be16(s, val >> 8);
284 void put_tag(ByteIOContext *s, const char *tag)
293 static void fill_buffer(ByteIOContext *s)
295 uint8_t *dst= !s->max_packet_size && s->buf_end - s->buffer < s->buffer_size ? s->buf_ptr : s->buffer;
296 int len= s->buffer_size - (dst - s->buffer);
298 assert(s->buf_ptr == s->buf_end);
300 /* no need to do anything if EOF already reached */
304 if(s->update_checksum && dst == s->buffer){
305 if(s->buf_end > s->checksum_ptr)
306 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_end - s->checksum_ptr);
307 s->checksum_ptr= s->buffer;
311 len = s->read_packet(s->opaque, dst, len);
315 /* do not modify buffer if EOF reached so that a seek back can
316 be done without rereading data */
323 s->buf_end = dst + len;
327 unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
330 return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
333 unsigned long get_checksum(ByteIOContext *s)
335 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
336 s->update_checksum= NULL;
340 void init_checksum(ByteIOContext *s,
341 unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
342 unsigned long checksum)
344 s->update_checksum= update_checksum;
345 if(s->update_checksum){
346 s->checksum= checksum;
347 s->checksum_ptr= s->buf_ptr;
351 /* XXX: put an inline version */
352 int get_byte(ByteIOContext *s)
354 if (s->buf_ptr < s->buf_end) {
355 return *s->buf_ptr++;
358 if (s->buf_ptr < s->buf_end)
359 return *s->buf_ptr++;
365 int url_fgetc(ByteIOContext *s)
367 if (s->buf_ptr < s->buf_end) {
368 return *s->buf_ptr++;
371 if (s->buf_ptr < s->buf_end)
372 return *s->buf_ptr++;
378 int get_buffer(ByteIOContext *s, unsigned char *buf, int size)
384 len = s->buf_end - s->buf_ptr;
388 if(size > s->buffer_size && !s->update_checksum){
390 len = s->read_packet(s->opaque, buf, size);
392 /* do not modify buffer if EOF reached so that a seek back can
393 be done without rereading data */
402 s->buf_ptr = s->buffer;
403 s->buf_end = s->buffer/* + len*/;
407 len = s->buf_end - s->buf_ptr;
412 memcpy(buf, s->buf_ptr, len);
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);
440 unsigned int get_le16(ByteIOContext *s)
444 val |= get_byte(s) << 8;
448 unsigned int get_le24(ByteIOContext *s)
452 val |= get_byte(s) << 16;
456 unsigned int get_le32(ByteIOContext *s)
460 val |= get_le16(s) << 16;
464 uint64_t get_le64(ByteIOContext *s)
467 val = (uint64_t)get_le32(s);
468 val |= (uint64_t)get_le32(s) << 32;
472 unsigned int get_be16(ByteIOContext *s)
475 val = get_byte(s) << 8;
480 unsigned int get_be24(ByteIOContext *s)
483 val = get_be16(s) << 8;
487 unsigned int get_be32(ByteIOContext *s)
490 val = get_be16(s) << 16;
495 char *get_strz(ByteIOContext *s, char *buf, int maxlen)
500 while ((c = get_byte(s))) {
505 buf[i] = 0; /* Ensure null terminated, but may be truncated */
510 uint64_t get_be64(ByteIOContext *s)
513 val = (uint64_t)get_be32(s) << 32;
514 val |= (uint64_t)get_be32(s);
518 uint64_t ff_get_v(ByteIOContext *bc){
524 val= (val<<7) + (tmp&127);
529 int url_fdopen(ByteIOContext **s, URLContext *h)
532 int buffer_size, max_packet_size;
535 max_packet_size = url_get_max_packet_size(h);
536 if (max_packet_size) {
537 buffer_size = max_packet_size; /* no need to bufferize more than one packet */
539 buffer_size = IO_BUFFER_SIZE;
541 buffer = av_malloc(buffer_size);
543 return AVERROR(ENOMEM);
545 *s = av_mallocz(sizeof(ByteIOContext));
548 return AVERROR(ENOMEM);
551 if (init_put_byte(*s, buffer, buffer_size,
552 (h->flags & URL_WRONLY || h->flags & URL_RDWR), h,
553 url_read, url_write, url_seek) < 0) {
558 (*s)->is_streamed = h->is_streamed;
559 (*s)->max_packet_size = max_packet_size;
561 (*s)->read_pause = (int (*)(void *, int))h->prot->url_read_pause;
562 (*s)->read_seek = (int64_t (*)(void *, int, int64_t, int))h->prot->url_read_seek;
567 int url_setbufsize(ByteIOContext *s, int buf_size)
570 buffer = av_malloc(buf_size);
572 return AVERROR(ENOMEM);
576 s->buffer_size = buf_size;
578 url_resetbuf(s, s->write_flag ? URL_WRONLY : URL_RDONLY);
582 int url_resetbuf(ByteIOContext *s, int flags)
584 URLContext *h = s->opaque;
585 if ((flags & URL_RDWR) || (h && h->flags != flags && !h->flags & URL_RDWR))
586 return AVERROR(EINVAL);
588 if (flags & URL_WRONLY) {
589 s->buf_end = s->buffer + s->buffer_size;
592 s->buf_end = s->buffer;
598 int url_fopen(ByteIOContext **s, const char *filename, int flags)
603 err = url_open(&h, filename, flags);
606 err = url_fdopen(s, h);
614 int url_fclose(ByteIOContext *s)
616 URLContext *h = s->opaque;
623 URLContext *url_fileno(ByteIOContext *s)
629 int url_fprintf(ByteIOContext *s, const char *fmt, ...)
636 ret = vsnprintf(buf, sizeof(buf), fmt, ap);
638 put_buffer(s, buf, strlen(buf));
641 #endif //CONFIG_MUXERS
643 char *url_fgets(ByteIOContext *s, char *buf, int buf_size)
653 if (c == EOF || c == '\n')
655 if ((q - buf) < buf_size - 1)
664 int url_fget_max_packet_size(ByteIOContext *s)
666 return s->max_packet_size;
669 int av_url_read_fpause(ByteIOContext *s, int pause)
672 return AVERROR(ENOSYS);
673 return s->read_pause(s->opaque, pause);
676 int64_t av_url_read_fseek(ByteIOContext *s, int stream_index,
677 int64_t timestamp, int flags)
679 URLContext *h = s->opaque;
682 return AVERROR(ENOSYS);
683 ret = s->read_seek(h, stream_index, timestamp, flags);
685 s->buf_ptr = s->buf_end; // Flush buffer
686 s->pos = s->seek(h, 0, SEEK_CUR);
691 /* url_open_dyn_buf and url_close_dyn_buf are used in rtp.c to send a response
692 * back to the server even if CONFIG_MUXERS is false. */
693 #if CONFIG_MUXERS || CONFIG_NETWORK
694 /* buffer handling */
695 int url_open_buf(ByteIOContext **s, uint8_t *buf, int buf_size, int flags)
698 *s = av_mallocz(sizeof(ByteIOContext));
700 return AVERROR(ENOMEM);
701 ret = init_put_byte(*s, buf, buf_size,
702 (flags & URL_WRONLY || flags & URL_RDWR),
703 NULL, NULL, NULL, NULL);
709 int url_close_buf(ByteIOContext *s)
712 return s->buf_ptr - s->buffer;
715 /* output in a dynamic buffer */
717 typedef struct DynBuffer {
718 int pos, size, allocated_size;
721 uint8_t io_buffer[1];
724 static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
726 DynBuffer *d = opaque;
727 unsigned new_size, new_allocated_size;
729 /* reallocate buffer if needed */
730 new_size = d->pos + buf_size;
731 new_allocated_size = d->allocated_size;
732 if(new_size < d->pos || new_size > INT_MAX/2)
734 while (new_size > new_allocated_size) {
735 if (!new_allocated_size)
736 new_allocated_size = new_size;
738 new_allocated_size += new_allocated_size / 2 + 1;
741 if (new_allocated_size > d->allocated_size) {
742 d->buffer = av_realloc(d->buffer, new_allocated_size);
743 if(d->buffer == NULL)
744 return AVERROR(ENOMEM);
745 d->allocated_size = new_allocated_size;
747 memcpy(d->buffer + d->pos, buf, buf_size);
749 if (d->pos > d->size)
754 static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
756 unsigned char buf1[4];
759 /* packetized write: output the header */
760 AV_WB32(buf1, buf_size);
761 ret= dyn_buf_write(opaque, buf1, 4);
766 return dyn_buf_write(opaque, buf, buf_size);
769 static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence)
771 DynBuffer *d = opaque;
773 if (whence == SEEK_CUR)
775 else if (whence == SEEK_END)
777 if (offset < 0 || offset > 0x7fffffffLL)
783 static int url_open_dyn_buf_internal(ByteIOContext **s, int max_packet_size)
787 unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024;
789 if(sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
791 d = av_mallocz(sizeof(DynBuffer) + io_buffer_size);
793 return AVERROR(ENOMEM);
794 *s = av_mallocz(sizeof(ByteIOContext));
797 return AVERROR(ENOMEM);
799 d->io_buffer_size = io_buffer_size;
800 ret = init_put_byte(*s, d->io_buffer, io_buffer_size,
802 max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
803 max_packet_size ? NULL : dyn_buf_seek);
805 (*s)->max_packet_size = max_packet_size;
813 int url_open_dyn_buf(ByteIOContext **s)
815 return url_open_dyn_buf_internal(s, 0);
818 int url_open_dyn_packet_buf(ByteIOContext **s, int max_packet_size)
820 if (max_packet_size <= 0)
822 return url_open_dyn_buf_internal(s, max_packet_size);
825 int url_close_dyn_buf(ByteIOContext *s, uint8_t **pbuffer)
827 DynBuffer *d = s->opaque;
832 *pbuffer = d->buffer;
838 #endif /* CONFIG_MUXERS || CONFIG_NETWORK */