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;
61 static void flush_buffer(ByteIOContext *s)
63 if (s->buf_ptr > s->buffer) {
64 if (s->write_packet && !s->error){
65 int ret= s->write_packet(s->opaque, s->buffer, s->buf_ptr - s->buffer);
70 if(s->update_checksum){
71 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
72 s->checksum_ptr= s->buffer;
74 s->pos += s->buf_ptr - s->buffer;
76 s->buf_ptr = s->buffer;
79 void put_byte(ByteIOContext *s, int b)
82 if (s->buf_ptr >= s->buf_end)
86 void put_buffer(ByteIOContext *s, const unsigned char *buf, int size)
91 len = (s->buf_end - s->buf_ptr);
94 memcpy(s->buf_ptr, buf, len);
97 if (s->buf_ptr >= s->buf_end)
105 void put_flush_packet(ByteIOContext *s)
111 offset_t url_fseek(ByteIOContext *s, offset_t offset, int whence)
114 offset_t pos= s->pos - (s->write_flag ? 0 : (s->buf_end - s->buffer));
116 if (whence != SEEK_CUR && whence != SEEK_SET)
117 return AVERROR(EINVAL);
119 if (whence == SEEK_CUR) {
120 offset1 = pos + (s->buf_ptr - s->buffer);
125 offset1 = offset - pos;
126 if (!s->must_flush &&
127 offset1 >= 0 && offset1 < (s->buf_end - s->buffer)) {
128 /* can do the seek inside the buffer */
129 s->buf_ptr = s->buffer + offset1;
130 } else if(s->is_streamed && !s->write_flag &&
131 offset1 >= 0 && offset1 < (s->buf_end - s->buffer) + (1<<16)){
132 while(s->pos < offset && !s->eof_reached)
134 s->buf_ptr = s->buf_end + offset - s->pos;
136 offset_t res = AVERROR(EPIPE);
138 #if defined(CONFIG_MUXERS) || defined(CONFIG_NETWORK)
143 #endif /* defined(CONFIG_MUXERS) || defined(CONFIG_NETWORK) */
145 s->buf_end = s->buffer;
147 s->buf_ptr = s->buffer;
148 if (!s->seek || (res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
156 void url_fskip(ByteIOContext *s, offset_t offset)
158 url_fseek(s, offset, SEEK_CUR);
161 offset_t url_ftell(ByteIOContext *s)
163 return url_fseek(s, 0, SEEK_CUR);
166 offset_t url_fsize(ByteIOContext *s)
171 return AVERROR(EPIPE);
172 size = s->seek(s->opaque, 0, AVSEEK_SIZE);
174 if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
177 s->seek(s->opaque, s->pos, SEEK_SET);
182 int url_feof(ByteIOContext *s)
184 return s->eof_reached;
187 int url_ferror(ByteIOContext *s)
192 void put_le32(ByteIOContext *s, unsigned int val)
195 put_byte(s, val >> 8);
196 put_byte(s, val >> 16);
197 put_byte(s, val >> 24);
200 void put_be32(ByteIOContext *s, unsigned int val)
202 put_byte(s, val >> 24);
203 put_byte(s, val >> 16);
204 put_byte(s, val >> 8);
208 void put_strz(ByteIOContext *s, const char *str)
211 put_buffer(s, (const unsigned char *) str, strlen(str) + 1);
216 void put_le64(ByteIOContext *s, uint64_t val)
218 put_le32(s, (uint32_t)(val & 0xffffffff));
219 put_le32(s, (uint32_t)(val >> 32));
222 void put_be64(ByteIOContext *s, uint64_t val)
224 put_be32(s, (uint32_t)(val >> 32));
225 put_be32(s, (uint32_t)(val & 0xffffffff));
228 void put_le16(ByteIOContext *s, unsigned int val)
231 put_byte(s, val >> 8);
234 void put_be16(ByteIOContext *s, unsigned int val)
236 put_byte(s, val >> 8);
240 void put_le24(ByteIOContext *s, unsigned int val)
242 put_le16(s, val & 0xffff);
243 put_byte(s, val >> 16);
246 void put_be24(ByteIOContext *s, unsigned int val)
248 put_be16(s, val >> 8);
252 void put_tag(ByteIOContext *s, const char *tag)
261 static void fill_buffer(ByteIOContext *s)
265 /* no need to do anything if EOF already reached */
269 if(s->update_checksum){
270 if(s->buf_end > s->checksum_ptr)
271 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_end - s->checksum_ptr);
272 s->checksum_ptr= s->buffer;
276 len = s->read_packet(s->opaque, s->buffer, s->buffer_size);
278 /* do not modify buffer if EOF reached so that a seek back can
279 be done without rereading data */
285 s->buf_ptr = s->buffer;
286 s->buf_end = s->buffer + len;
290 unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf, unsigned int len){
291 return av_crc(av_crc04C11DB7, checksum, buf, len);
294 unsigned long get_checksum(ByteIOContext *s){
295 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
296 s->update_checksum= NULL;
300 void init_checksum(ByteIOContext *s, unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len), unsigned long checksum){
301 s->update_checksum= update_checksum;
302 if(s->update_checksum){
303 s->checksum= checksum;
304 s->checksum_ptr= s->buf_ptr;
308 /* XXX: put an inline version */
309 int get_byte(ByteIOContext *s)
311 if (s->buf_ptr < s->buf_end) {
312 return *s->buf_ptr++;
315 if (s->buf_ptr < s->buf_end)
316 return *s->buf_ptr++;
322 int url_fgetc(ByteIOContext *s)
324 if (s->buf_ptr < s->buf_end) {
325 return *s->buf_ptr++;
328 if (s->buf_ptr < s->buf_end)
329 return *s->buf_ptr++;
335 int get_buffer(ByteIOContext *s, unsigned char *buf, int size)
341 len = s->buf_end - s->buf_ptr;
345 if(size > s->buffer_size && !s->update_checksum){
347 len = s->read_packet(s->opaque, buf, size);
349 /* do not modify buffer if EOF reached so that a seek back can
350 be done without rereading data */
359 s->buf_ptr = s->buffer;
360 s->buf_end = s->buffer/* + len*/;
364 len = s->buf_end - s->buf_ptr;
369 memcpy(buf, s->buf_ptr, len);
378 int get_partial_buffer(ByteIOContext *s, unsigned char *buf, int size)
385 len = s->buf_end - s->buf_ptr;
388 len = s->buf_end - s->buf_ptr;
392 memcpy(buf, s->buf_ptr, len);
397 unsigned int get_le16(ByteIOContext *s)
401 val |= get_byte(s) << 8;
405 unsigned int get_le24(ByteIOContext *s)
409 val |= get_byte(s) << 16;
413 unsigned int get_le32(ByteIOContext *s)
417 val |= get_le16(s) << 16;
421 uint64_t get_le64(ByteIOContext *s)
424 val = (uint64_t)get_le32(s);
425 val |= (uint64_t)get_le32(s) << 32;
429 unsigned int get_be16(ByteIOContext *s)
432 val = get_byte(s) << 8;
437 unsigned int get_be24(ByteIOContext *s)
440 val = get_be16(s) << 8;
444 unsigned int get_be32(ByteIOContext *s)
447 val = get_be16(s) << 16;
452 char *get_strz(ByteIOContext *s, char *buf, int maxlen)
457 while ((c = get_byte(s))) {
462 buf[i] = 0; /* Ensure null terminated, but may be truncated */
467 uint64_t get_be64(ByteIOContext *s)
470 val = (uint64_t)get_be32(s) << 32;
471 val |= (uint64_t)get_be32(s);
475 uint64_t get_v(ByteIOContext *bc){
481 val= (val<<7) + (tmp&127);
486 /* link with avio functions */
489 static int url_write_packet(void *opaque, uint8_t *buf, int buf_size)
491 URLContext *h = opaque;
492 return url_write(h, buf, buf_size);
495 #define url_write_packet NULL
496 #endif //CONFIG_MUXERS
498 static int url_read_packet(void *opaque, uint8_t *buf, int buf_size)
500 URLContext *h = opaque;
501 return url_read(h, buf, buf_size);
504 static offset_t url_seek_packet(void *opaque, offset_t offset, int whence)
506 URLContext *h = opaque;
507 return url_seek(h, offset, whence);
511 int url_fdopen(ByteIOContext *s, URLContext *h)
514 int buffer_size, max_packet_size;
517 max_packet_size = url_get_max_packet_size(h);
518 if (max_packet_size) {
519 buffer_size = max_packet_size; /* no need to bufferize more than one packet */
521 buffer_size = IO_BUFFER_SIZE;
523 buffer = av_malloc(buffer_size);
525 return AVERROR(ENOMEM);
527 if (init_put_byte(s, buffer, buffer_size,
528 (h->flags & URL_WRONLY || h->flags & URL_RDWR), h,
529 url_read_packet, url_write_packet, url_seek_packet) < 0) {
533 s->is_streamed = h->is_streamed;
534 s->max_packet_size = max_packet_size;
538 int url_setbufsize(ByteIOContext *s, int buf_size)
541 buffer = av_malloc(buf_size);
543 return AVERROR(ENOMEM);
547 s->buffer_size = buf_size;
549 url_resetbuf(s, s->write_flag ? URL_WRONLY : URL_RDONLY);
553 int url_resetbuf(ByteIOContext *s, int flags)
555 URLContext *h = s->opaque;
556 if ((flags & URL_RDWR) || (h && h->flags != flags && !h->flags & URL_RDWR))
557 return AVERROR(EINVAL);
559 if (flags & URL_WRONLY) {
560 s->buf_end = s->buffer + s->buffer_size;
563 s->buf_end = s->buffer;
569 int url_fopen(ByteIOContext *s, const char *filename, int flags)
574 err = url_open(&h, filename, flags);
577 err = url_fdopen(s, h);
585 int url_fclose(ByteIOContext *s)
587 URLContext *h = s->opaque;
590 memset(s, 0, sizeof(ByteIOContext));
594 URLContext *url_fileno(ByteIOContext *s)
600 int url_fprintf(ByteIOContext *s, const char *fmt, ...)
607 ret = vsnprintf(buf, sizeof(buf), fmt, ap);
609 put_buffer(s, buf, strlen(buf));
612 #endif //CONFIG_MUXERS
614 char *url_fgets(ByteIOContext *s, char *buf, int buf_size)
624 if (c == EOF || c == '\n')
626 if ((q - buf) < buf_size - 1)
635 int url_fget_max_packet_size(ByteIOContext *s)
637 return s->max_packet_size;
640 /* url_open_dyn_buf and url_close_dyn_buf are used in rtp.c to send a response
641 * back to the server even if CONFIG_MUXERS is not set. */
642 #if defined(CONFIG_MUXERS) || defined(CONFIG_NETWORK)
643 /* buffer handling */
644 int url_open_buf(ByteIOContext *s, uint8_t *buf, int buf_size, int flags)
646 return init_put_byte(s, buf, buf_size,
647 (flags & URL_WRONLY || flags & URL_RDWR),
648 NULL, NULL, NULL, NULL);
651 int url_close_buf(ByteIOContext *s)
654 return s->buf_ptr - s->buffer;
657 /* output in a dynamic buffer */
659 typedef struct DynBuffer {
660 int pos, size, allocated_size;
663 uint8_t io_buffer[1];
666 static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
668 DynBuffer *d = opaque;
669 int new_size, new_allocated_size;
671 /* reallocate buffer if needed */
672 new_size = d->pos + buf_size;
673 new_allocated_size = d->allocated_size;
674 if(new_size < d->pos || new_size > INT_MAX/2)
676 while (new_size > new_allocated_size) {
677 if (!new_allocated_size)
678 new_allocated_size = new_size;
680 new_allocated_size += new_allocated_size / 2 + 1;
683 if (new_allocated_size > d->allocated_size) {
684 d->buffer = av_realloc(d->buffer, new_allocated_size);
685 if(d->buffer == NULL)
687 d->allocated_size = new_allocated_size;
689 memcpy(d->buffer + d->pos, buf, buf_size);
691 if (d->pos > d->size)
696 static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
698 unsigned char buf1[4];
701 /* packetized write: output the header */
702 buf1[0] = (buf_size >> 24);
703 buf1[1] = (buf_size >> 16);
704 buf1[2] = (buf_size >> 8);
705 buf1[3] = (buf_size);
706 ret= dyn_buf_write(opaque, buf1, 4);
711 return dyn_buf_write(opaque, buf, buf_size);
714 static offset_t dyn_buf_seek(void *opaque, offset_t offset, int whence)
716 DynBuffer *d = opaque;
718 if (whence == SEEK_CUR)
720 else if (whence == SEEK_END)
722 if (offset < 0 || offset > 0x7fffffffLL)
728 static int url_open_dyn_buf_internal(ByteIOContext *s, int max_packet_size)
731 int io_buffer_size, ret;
734 io_buffer_size = max_packet_size;
736 io_buffer_size = 1024;
738 if(sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
740 d = av_malloc(sizeof(DynBuffer) + io_buffer_size);
743 d->io_buffer_size = io_buffer_size;
747 d->allocated_size = 0;
748 ret = init_put_byte(s, d->io_buffer, io_buffer_size,
750 max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
751 max_packet_size ? NULL : dyn_buf_seek);
753 s->max_packet_size = max_packet_size;
758 int url_open_dyn_buf(ByteIOContext *s)
760 return url_open_dyn_buf_internal(s, 0);
763 int url_open_dyn_packet_buf(ByteIOContext *s, int max_packet_size)
765 if (max_packet_size <= 0)
767 return url_open_dyn_buf_internal(s, max_packet_size);
770 int url_close_dyn_buf(ByteIOContext *s, uint8_t **pbuffer)
772 DynBuffer *d = s->opaque;
777 *pbuffer = d->buffer;
782 #endif /* CONFIG_MUXERS || CONFIG_NETWORK */