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;
63 static void flush_buffer(ByteIOContext *s)
65 if (s->buf_ptr > s->buffer) {
66 if (s->write_packet && !s->error){
67 int ret= s->write_packet(s->opaque, s->buffer, s->buf_ptr - s->buffer);
72 if(s->update_checksum){
73 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
74 s->checksum_ptr= s->buffer;
76 s->pos += s->buf_ptr - s->buffer;
78 s->buf_ptr = s->buffer;
81 void put_byte(ByteIOContext *s, int b)
84 if (s->buf_ptr >= s->buf_end)
88 void put_buffer(ByteIOContext *s, const unsigned char *buf, int size)
93 len = (s->buf_end - s->buf_ptr);
96 memcpy(s->buf_ptr, buf, len);
99 if (s->buf_ptr >= s->buf_end)
107 void put_flush_packet(ByteIOContext *s)
113 offset_t url_fseek(ByteIOContext *s, offset_t offset, int whence)
119 return AVERROR(EINVAL);
121 pos = s->pos - (s->write_flag ? 0 : (s->buf_end - s->buffer));
123 if (whence != SEEK_CUR && whence != SEEK_SET)
124 return AVERROR(EINVAL);
126 if (whence == SEEK_CUR) {
127 offset1 = pos + (s->buf_ptr - s->buffer);
132 offset1 = offset - pos;
133 if (!s->must_flush &&
134 offset1 >= 0 && offset1 < (s->buf_end - s->buffer)) {
135 /* can do the seek inside the buffer */
136 s->buf_ptr = s->buffer + offset1;
137 } else if(s->is_streamed && !s->write_flag &&
138 offset1 >= 0 && offset1 < (s->buf_end - s->buffer) + (1<<16)){
139 while(s->pos < offset && !s->eof_reached)
142 return AVERROR(EPIPE);
143 s->buf_ptr = s->buf_end + offset - s->pos;
145 offset_t res = AVERROR(EPIPE);
147 #if defined(CONFIG_MUXERS) || defined(CONFIG_NETWORK)
152 #endif /* defined(CONFIG_MUXERS) || defined(CONFIG_NETWORK) */
154 s->buf_end = s->buffer;
156 s->buf_ptr = s->buffer;
157 if (!s->seek || (res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
165 void url_fskip(ByteIOContext *s, offset_t offset)
167 url_fseek(s, offset, SEEK_CUR);
170 offset_t url_ftell(ByteIOContext *s)
172 return url_fseek(s, 0, SEEK_CUR);
175 offset_t url_fsize(ByteIOContext *s)
180 return AVERROR(EINVAL);
183 return AVERROR(EPIPE);
184 size = s->seek(s->opaque, 0, AVSEEK_SIZE);
186 if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
189 s->seek(s->opaque, s->pos, SEEK_SET);
194 int url_feof(ByteIOContext *s)
198 return s->eof_reached;
201 int url_ferror(ByteIOContext *s)
208 void put_le32(ByteIOContext *s, unsigned int val)
211 put_byte(s, val >> 8);
212 put_byte(s, val >> 16);
213 put_byte(s, val >> 24);
216 void put_be32(ByteIOContext *s, unsigned int val)
218 put_byte(s, val >> 24);
219 put_byte(s, val >> 16);
220 put_byte(s, val >> 8);
224 void put_strz(ByteIOContext *s, const char *str)
227 put_buffer(s, (const unsigned char *) str, strlen(str) + 1);
232 void put_le64(ByteIOContext *s, uint64_t val)
234 put_le32(s, (uint32_t)(val & 0xffffffff));
235 put_le32(s, (uint32_t)(val >> 32));
238 void put_be64(ByteIOContext *s, uint64_t val)
240 put_be32(s, (uint32_t)(val >> 32));
241 put_be32(s, (uint32_t)(val & 0xffffffff));
244 void put_le16(ByteIOContext *s, unsigned int val)
247 put_byte(s, val >> 8);
250 void put_be16(ByteIOContext *s, unsigned int val)
252 put_byte(s, val >> 8);
256 void put_le24(ByteIOContext *s, unsigned int val)
258 put_le16(s, val & 0xffff);
259 put_byte(s, val >> 16);
262 void put_be24(ByteIOContext *s, unsigned int val)
264 put_be16(s, val >> 8);
268 void put_tag(ByteIOContext *s, const char *tag)
277 static void fill_buffer(ByteIOContext *s)
281 /* no need to do anything if EOF already reached */
285 if(s->update_checksum){
286 if(s->buf_end > s->checksum_ptr)
287 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_end - s->checksum_ptr);
288 s->checksum_ptr= s->buffer;
292 len = s->read_packet(s->opaque, s->buffer, s->buffer_size);
294 /* do not modify buffer if EOF reached so that a seek back can
295 be done without rereading data */
301 s->buf_ptr = s->buffer;
302 s->buf_end = s->buffer + len;
306 unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf, unsigned int len){
307 return av_crc(av_crc04C11DB7, checksum, buf, len);
310 unsigned long get_checksum(ByteIOContext *s){
311 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
312 s->update_checksum= NULL;
316 void init_checksum(ByteIOContext *s, unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len), unsigned long checksum){
317 s->update_checksum= update_checksum;
318 if(s->update_checksum){
319 s->checksum= checksum;
320 s->checksum_ptr= s->buf_ptr;
324 /* XXX: put an inline version */
325 int get_byte(ByteIOContext *s)
327 if (s->buf_ptr < s->buf_end) {
328 return *s->buf_ptr++;
331 if (s->buf_ptr < s->buf_end)
332 return *s->buf_ptr++;
338 int url_fgetc(ByteIOContext *s)
340 if (s->buf_ptr < s->buf_end) {
341 return *s->buf_ptr++;
344 if (s->buf_ptr < s->buf_end)
345 return *s->buf_ptr++;
351 int get_buffer(ByteIOContext *s, unsigned char *buf, int size)
357 len = s->buf_end - s->buf_ptr;
361 if(size > s->buffer_size && !s->update_checksum){
363 len = s->read_packet(s->opaque, buf, size);
365 /* do not modify buffer if EOF reached so that a seek back can
366 be done without rereading data */
375 s->buf_ptr = s->buffer;
376 s->buf_end = s->buffer/* + len*/;
380 len = s->buf_end - s->buf_ptr;
385 memcpy(buf, s->buf_ptr, len);
394 int get_partial_buffer(ByteIOContext *s, unsigned char *buf, int size)
401 len = s->buf_end - s->buf_ptr;
404 len = s->buf_end - s->buf_ptr;
408 memcpy(buf, s->buf_ptr, len);
413 unsigned int get_le16(ByteIOContext *s)
417 val |= get_byte(s) << 8;
421 unsigned int get_le24(ByteIOContext *s)
425 val |= get_byte(s) << 16;
429 unsigned int get_le32(ByteIOContext *s)
433 val |= get_le16(s) << 16;
437 uint64_t get_le64(ByteIOContext *s)
440 val = (uint64_t)get_le32(s);
441 val |= (uint64_t)get_le32(s) << 32;
445 unsigned int get_be16(ByteIOContext *s)
448 val = get_byte(s) << 8;
453 unsigned int get_be24(ByteIOContext *s)
456 val = get_be16(s) << 8;
460 unsigned int get_be32(ByteIOContext *s)
463 val = get_be16(s) << 16;
468 char *get_strz(ByteIOContext *s, char *buf, int maxlen)
473 while ((c = get_byte(s))) {
478 buf[i] = 0; /* Ensure null terminated, but may be truncated */
483 uint64_t get_be64(ByteIOContext *s)
486 val = (uint64_t)get_be32(s) << 32;
487 val |= (uint64_t)get_be32(s);
491 uint64_t ff_get_v(ByteIOContext *bc){
497 val= (val<<7) + (tmp&127);
502 int url_fdopen(ByteIOContext **s, URLContext *h)
505 int buffer_size, max_packet_size;
508 max_packet_size = url_get_max_packet_size(h);
509 if (max_packet_size) {
510 buffer_size = max_packet_size; /* no need to bufferize more than one packet */
512 buffer_size = IO_BUFFER_SIZE;
514 buffer = av_malloc(buffer_size);
516 return AVERROR(ENOMEM);
518 *s = av_mallocz(sizeof(ByteIOContext));
521 return AVERROR(ENOMEM);
524 if (init_put_byte(*s, buffer, buffer_size,
525 (h->flags & URL_WRONLY || h->flags & URL_RDWR), h,
526 url_read, url_write, url_seek) < 0) {
531 (*s)->is_streamed = h->is_streamed;
532 (*s)->max_packet_size = max_packet_size;
534 (*s)->read_pause = (int (*)(void *, int))h->prot->url_read_pause;
535 (*s)->read_seek = (offset_t (*)(void *, int, int64_t, int))h->prot->url_read_seek;
540 int url_setbufsize(ByteIOContext *s, int buf_size)
543 buffer = av_malloc(buf_size);
545 return AVERROR(ENOMEM);
549 s->buffer_size = buf_size;
551 url_resetbuf(s, s->write_flag ? URL_WRONLY : URL_RDONLY);
555 int url_resetbuf(ByteIOContext *s, int flags)
557 URLContext *h = s->opaque;
558 if ((flags & URL_RDWR) || (h && h->flags != flags && !h->flags & URL_RDWR))
559 return AVERROR(EINVAL);
561 if (flags & URL_WRONLY) {
562 s->buf_end = s->buffer + s->buffer_size;
565 s->buf_end = s->buffer;
571 int url_fopen(ByteIOContext **s, const char *filename, int flags)
576 err = url_open(&h, filename, flags);
579 err = url_fdopen(s, h);
587 int url_fclose(ByteIOContext *s)
589 URLContext *h = s->opaque;
596 URLContext *url_fileno(ByteIOContext *s)
602 int url_fprintf(ByteIOContext *s, const char *fmt, ...)
609 ret = vsnprintf(buf, sizeof(buf), fmt, ap);
611 put_buffer(s, buf, strlen(buf));
614 #endif //CONFIG_MUXERS
616 char *url_fgets(ByteIOContext *s, char *buf, int buf_size)
626 if (c == EOF || c == '\n')
628 if ((q - buf) < buf_size - 1)
637 int url_fget_max_packet_size(ByteIOContext *s)
639 return s->max_packet_size;
642 int av_url_read_fpause(ByteIOContext *s, int pause)
645 return AVERROR(ENOSYS);
646 return s->read_pause(s->opaque, pause);
649 offset_t av_url_read_fseek(ByteIOContext *s,
650 int stream_index, int64_t timestamp, int flags)
652 URLContext *h = s->opaque;
655 return AVERROR(ENOSYS);
656 ret = s->read_seek(h, stream_index, timestamp, flags);
658 s->buf_ptr = s->buf_end; // Flush buffer
659 s->pos = s->seek(h, 0, SEEK_CUR);
664 /* url_open_dyn_buf and url_close_dyn_buf are used in rtp.c to send a response
665 * back to the server even if CONFIG_MUXERS is not set. */
666 #if defined(CONFIG_MUXERS) || defined(CONFIG_NETWORK)
667 /* buffer handling */
668 int url_open_buf(ByteIOContext **s, uint8_t *buf, int buf_size, int flags)
671 *s = av_mallocz(sizeof(ByteIOContext));
673 return AVERROR(ENOMEM);
674 ret = init_put_byte(*s, buf, buf_size,
675 (flags & URL_WRONLY || flags & URL_RDWR),
676 NULL, NULL, NULL, NULL);
682 int url_close_buf(ByteIOContext *s)
685 return s->buf_ptr - s->buffer;
688 /* output in a dynamic buffer */
690 typedef struct DynBuffer {
691 int pos, size, allocated_size;
694 uint8_t io_buffer[1];
697 static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
699 DynBuffer *d = opaque;
700 int new_size, new_allocated_size;
702 /* reallocate buffer if needed */
703 new_size = d->pos + buf_size;
704 new_allocated_size = d->allocated_size;
705 if(new_size < d->pos || new_size > INT_MAX/2)
707 while (new_size > new_allocated_size) {
708 if (!new_allocated_size)
709 new_allocated_size = new_size;
711 new_allocated_size += new_allocated_size / 2 + 1;
714 if (new_allocated_size > d->allocated_size) {
715 d->buffer = av_realloc(d->buffer, new_allocated_size);
716 if(d->buffer == NULL)
718 d->allocated_size = new_allocated_size;
720 memcpy(d->buffer + d->pos, buf, buf_size);
722 if (d->pos > d->size)
727 static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
729 unsigned char buf1[4];
732 /* packetized write: output the header */
733 buf1[0] = (buf_size >> 24);
734 buf1[1] = (buf_size >> 16);
735 buf1[2] = (buf_size >> 8);
736 buf1[3] = (buf_size);
737 ret= dyn_buf_write(opaque, buf1, 4);
742 return dyn_buf_write(opaque, buf, buf_size);
745 static offset_t dyn_buf_seek(void *opaque, offset_t offset, int whence)
747 DynBuffer *d = opaque;
749 if (whence == SEEK_CUR)
751 else if (whence == SEEK_END)
753 if (offset < 0 || offset > 0x7fffffffLL)
759 static int url_open_dyn_buf_internal(ByteIOContext **s, int max_packet_size)
762 int io_buffer_size, ret;
765 io_buffer_size = max_packet_size;
767 io_buffer_size = 1024;
769 if(sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
771 d = av_malloc(sizeof(DynBuffer) + io_buffer_size);
774 *s = av_mallocz(sizeof(ByteIOContext));
777 return AVERROR(ENOMEM);
779 d->io_buffer_size = io_buffer_size;
783 d->allocated_size = 0;
784 ret = init_put_byte(*s, d->io_buffer, io_buffer_size,
786 max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
787 max_packet_size ? NULL : dyn_buf_seek);
789 (*s)->max_packet_size = max_packet_size;
797 int url_open_dyn_buf(ByteIOContext **s)
799 return url_open_dyn_buf_internal(s, 0);
802 int url_open_dyn_packet_buf(ByteIOContext **s, int max_packet_size)
804 if (max_packet_size <= 0)
806 return url_open_dyn_buf_internal(s, max_packet_size);
809 int url_close_dyn_buf(ByteIOContext *s, uint8_t **pbuffer)
811 DynBuffer *d = s->opaque;
816 *pbuffer = d->buffer;
822 #endif /* CONFIG_MUXERS || CONFIG_NETWORK */