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;
44 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))
73 ByteIOContext *s = av_mallocz(sizeof(ByteIOContext));
74 init_put_byte(s, buffer, buffer_size, write_flag, opaque,
75 read_packet, write_packet, seek);
79 static void flush_buffer(ByteIOContext *s)
81 if (s->buf_ptr > s->buffer) {
82 if (s->write_packet && !s->error){
83 int ret= s->write_packet(s->opaque, s->buffer, s->buf_ptr - s->buffer);
88 if(s->update_checksum){
89 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
90 s->checksum_ptr= s->buffer;
92 s->pos += s->buf_ptr - s->buffer;
94 s->buf_ptr = s->buffer;
97 void put_byte(ByteIOContext *s, int b)
100 if (s->buf_ptr >= s->buf_end)
104 void put_buffer(ByteIOContext *s, const unsigned char *buf, int size)
109 len = (s->buf_end - s->buf_ptr);
112 memcpy(s->buf_ptr, buf, len);
115 if (s->buf_ptr >= s->buf_end)
123 void put_flush_packet(ByteIOContext *s)
129 int64_t url_fseek(ByteIOContext *s, int64_t offset, int whence)
135 return AVERROR(EINVAL);
137 pos = s->pos - (s->write_flag ? 0 : (s->buf_end - s->buffer));
139 if (whence != SEEK_CUR && whence != SEEK_SET)
140 return AVERROR(EINVAL);
142 if (whence == SEEK_CUR) {
143 offset1 = pos + (s->buf_ptr - s->buffer);
148 offset1 = offset - pos;
149 if (!s->must_flush &&
150 offset1 >= 0 && offset1 < (s->buf_end - s->buffer)) {
151 /* can do the seek inside the buffer */
152 s->buf_ptr = s->buffer + offset1;
153 } else if(s->is_streamed && !s->write_flag &&
154 offset1 >= 0 && offset1 < (s->buf_end - s->buffer) + (1<<16)){
155 while(s->pos < offset && !s->eof_reached)
158 return AVERROR(EPIPE);
159 s->buf_ptr = s->buf_end + offset - s->pos;
161 int64_t res = AVERROR(EPIPE);
163 #if CONFIG_MUXERS || CONFIG_NETWORK
168 #endif /* CONFIG_MUXERS || CONFIG_NETWORK */
169 if (!s->seek || (res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
172 s->buf_end = s->buffer;
173 s->buf_ptr = s->buffer;
180 void url_fskip(ByteIOContext *s, int64_t offset)
182 url_fseek(s, offset, SEEK_CUR);
185 int64_t url_ftell(ByteIOContext *s)
187 return url_fseek(s, 0, SEEK_CUR);
190 int64_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)
294 uint8_t *dst= !s->max_packet_size && s->buf_end - s->buffer < s->buffer_size ? s->buf_ptr : s->buffer;
295 int len= s->buffer_size - (dst - s->buffer);
297 assert(s->buf_ptr == s->buf_end);
299 /* no need to do anything if EOF already reached */
303 if(s->update_checksum && dst == s->buffer){
304 if(s->buf_end > s->checksum_ptr)
305 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_end - s->checksum_ptr);
306 s->checksum_ptr= s->buffer;
310 len = s->read_packet(s->opaque, dst, len);
314 /* do not modify buffer if EOF reached so that a seek back can
315 be done without rereading data */
322 s->buf_end = dst + len;
326 unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
329 return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
332 unsigned long get_checksum(ByteIOContext *s)
334 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
335 s->update_checksum= NULL;
339 void init_checksum(ByteIOContext *s,
340 unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
341 unsigned long checksum)
343 s->update_checksum= update_checksum;
344 if(s->update_checksum){
345 s->checksum= checksum;
346 s->checksum_ptr= s->buf_ptr;
350 /* XXX: put an inline version */
351 int get_byte(ByteIOContext *s)
353 if (s->buf_ptr < s->buf_end) {
354 return *s->buf_ptr++;
357 if (s->buf_ptr < s->buf_end)
358 return *s->buf_ptr++;
364 int url_fgetc(ByteIOContext *s)
366 if (s->buf_ptr < s->buf_end) {
367 return *s->buf_ptr++;
370 if (s->buf_ptr < s->buf_end)
371 return *s->buf_ptr++;
377 int get_buffer(ByteIOContext *s, unsigned char *buf, int size)
383 len = s->buf_end - s->buf_ptr;
387 if(size > s->buffer_size && !s->update_checksum){
389 len = s->read_packet(s->opaque, buf, size);
391 /* do not modify buffer if EOF reached so that a seek back can
392 be done without rereading data */
401 s->buf_ptr = s->buffer;
402 s->buf_end = s->buffer/* + len*/;
406 len = s->buf_end - s->buf_ptr;
411 memcpy(buf, s->buf_ptr, len);
420 int get_partial_buffer(ByteIOContext *s, unsigned char *buf, int size)
427 len = s->buf_end - s->buf_ptr;
430 len = s->buf_end - s->buf_ptr;
434 memcpy(buf, s->buf_ptr, len);
439 unsigned int get_le16(ByteIOContext *s)
443 val |= get_byte(s) << 8;
447 unsigned int get_le24(ByteIOContext *s)
451 val |= get_byte(s) << 16;
455 unsigned int get_le32(ByteIOContext *s)
459 val |= get_le16(s) << 16;
463 uint64_t get_le64(ByteIOContext *s)
466 val = (uint64_t)get_le32(s);
467 val |= (uint64_t)get_le32(s) << 32;
471 unsigned int get_be16(ByteIOContext *s)
474 val = get_byte(s) << 8;
479 unsigned int get_be24(ByteIOContext *s)
482 val = get_be16(s) << 8;
486 unsigned int get_be32(ByteIOContext *s)
489 val = get_be16(s) << 16;
494 char *get_strz(ByteIOContext *s, char *buf, int maxlen)
499 while ((c = get_byte(s))) {
504 buf[i] = 0; /* Ensure null terminated, but may be truncated */
509 uint64_t get_be64(ByteIOContext *s)
512 val = (uint64_t)get_be32(s) << 32;
513 val |= (uint64_t)get_be32(s);
517 uint64_t ff_get_v(ByteIOContext *bc){
523 val= (val<<7) + (tmp&127);
528 int url_fdopen(ByteIOContext **s, URLContext *h)
531 int buffer_size, max_packet_size;
534 max_packet_size = url_get_max_packet_size(h);
535 if (max_packet_size) {
536 buffer_size = max_packet_size; /* no need to bufferize more than one packet */
538 buffer_size = IO_BUFFER_SIZE;
540 buffer = av_malloc(buffer_size);
542 return AVERROR(ENOMEM);
544 *s = av_mallocz(sizeof(ByteIOContext));
547 return AVERROR(ENOMEM);
550 if (init_put_byte(*s, buffer, buffer_size,
551 (h->flags & URL_WRONLY || h->flags & URL_RDWR), h,
552 url_read, url_write, url_seek) < 0) {
557 (*s)->is_streamed = h->is_streamed;
558 (*s)->max_packet_size = max_packet_size;
560 (*s)->read_pause = (int (*)(void *, int))h->prot->url_read_pause;
561 (*s)->read_seek = (int64_t (*)(void *, int, int64_t, int))h->prot->url_read_seek;
566 int url_setbufsize(ByteIOContext *s, int buf_size)
569 buffer = av_malloc(buf_size);
571 return AVERROR(ENOMEM);
575 s->buffer_size = buf_size;
577 url_resetbuf(s, s->write_flag ? URL_WRONLY : URL_RDONLY);
581 int url_resetbuf(ByteIOContext *s, int flags)
583 URLContext *h = s->opaque;
584 if ((flags & URL_RDWR) || (h && h->flags != flags && !h->flags & URL_RDWR))
585 return AVERROR(EINVAL);
587 if (flags & URL_WRONLY) {
588 s->buf_end = s->buffer + s->buffer_size;
591 s->buf_end = s->buffer;
597 int url_fopen(ByteIOContext **s, const char *filename, int flags)
602 err = url_open(&h, filename, flags);
605 err = url_fdopen(s, h);
613 int url_fclose(ByteIOContext *s)
615 URLContext *h = s->opaque;
622 URLContext *url_fileno(ByteIOContext *s)
628 int url_fprintf(ByteIOContext *s, const char *fmt, ...)
635 ret = vsnprintf(buf, sizeof(buf), fmt, ap);
637 put_buffer(s, buf, strlen(buf));
640 #endif //CONFIG_MUXERS
642 char *url_fgets(ByteIOContext *s, char *buf, int buf_size)
652 if (c == EOF || c == '\n')
654 if ((q - buf) < buf_size - 1)
663 int url_fget_max_packet_size(ByteIOContext *s)
665 return s->max_packet_size;
668 int av_url_read_fpause(ByteIOContext *s, int pause)
671 return AVERROR(ENOSYS);
672 return s->read_pause(s->opaque, pause);
675 int64_t av_url_read_fseek(ByteIOContext *s, int stream_index,
676 int64_t timestamp, int flags)
678 URLContext *h = s->opaque;
681 return AVERROR(ENOSYS);
682 ret = s->read_seek(h, stream_index, timestamp, flags);
684 s->buf_ptr = s->buf_end; // Flush buffer
685 s->pos = s->seek(h, 0, SEEK_CUR);
690 /* url_open_dyn_buf and url_close_dyn_buf are used in rtp.c to send a response
691 * back to the server even if CONFIG_MUXERS is false. */
692 #if CONFIG_MUXERS || CONFIG_NETWORK
693 /* buffer handling */
694 int url_open_buf(ByteIOContext **s, uint8_t *buf, int buf_size, int flags)
697 *s = av_mallocz(sizeof(ByteIOContext));
699 return AVERROR(ENOMEM);
700 ret = init_put_byte(*s, buf, buf_size,
701 (flags & URL_WRONLY || flags & URL_RDWR),
702 NULL, NULL, NULL, NULL);
708 int url_close_buf(ByteIOContext *s)
711 return s->buf_ptr - s->buffer;
714 /* output in a dynamic buffer */
716 typedef struct DynBuffer {
717 int pos, size, allocated_size;
720 uint8_t io_buffer[1];
723 static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
725 DynBuffer *d = opaque;
726 unsigned new_size, new_allocated_size;
728 /* reallocate buffer if needed */
729 new_size = d->pos + buf_size;
730 new_allocated_size = d->allocated_size;
731 if(new_size < d->pos || new_size > INT_MAX/2)
733 while (new_size > new_allocated_size) {
734 if (!new_allocated_size)
735 new_allocated_size = new_size;
737 new_allocated_size += new_allocated_size / 2 + 1;
740 if (new_allocated_size > d->allocated_size) {
741 d->buffer = av_realloc(d->buffer, new_allocated_size);
742 if(d->buffer == NULL)
744 d->allocated_size = new_allocated_size;
746 memcpy(d->buffer + d->pos, buf, buf_size);
748 if (d->pos > d->size)
753 static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
755 unsigned char buf1[4];
758 /* packetized write: output the header */
759 buf1[0] = (buf_size >> 24);
760 buf1[1] = (buf_size >> 16);
761 buf1[2] = (buf_size >> 8);
762 buf1[3] = (buf_size);
763 ret= dyn_buf_write(opaque, buf1, 4);
768 return dyn_buf_write(opaque, buf, buf_size);
771 static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence)
773 DynBuffer *d = opaque;
775 if (whence == SEEK_CUR)
777 else if (whence == SEEK_END)
779 if (offset < 0 || offset > 0x7fffffffLL)
785 static int url_open_dyn_buf_internal(ByteIOContext **s, int max_packet_size)
788 int io_buffer_size, ret;
791 io_buffer_size = max_packet_size;
793 io_buffer_size = 1024;
795 if(sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
797 d = av_malloc(sizeof(DynBuffer) + io_buffer_size);
800 *s = av_mallocz(sizeof(ByteIOContext));
803 return AVERROR(ENOMEM);
805 d->io_buffer_size = io_buffer_size;
809 d->allocated_size = 0;
810 ret = init_put_byte(*s, d->io_buffer, io_buffer_size,
812 max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
813 max_packet_size ? NULL : dyn_buf_seek);
815 (*s)->max_packet_size = max_packet_size;
823 int url_open_dyn_buf(ByteIOContext **s)
825 return url_open_dyn_buf_internal(s, 0);
828 int url_open_dyn_packet_buf(ByteIOContext **s, int max_packet_size)
830 if (max_packet_size <= 0)
832 return url_open_dyn_buf_internal(s, max_packet_size);
835 int url_close_dyn_buf(ByteIOContext *s, uint8_t **pbuffer)
837 DynBuffer *d = s->opaque;
842 *pbuffer = d->buffer;
848 #endif /* CONFIG_MUXERS || CONFIG_NETWORK */