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"
30 #define IO_BUFFER_SIZE 32768
32 static void fill_buffer(ByteIOContext *s);
34 int init_put_byte(ByteIOContext *s,
35 unsigned char *buffer,
39 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
40 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
41 int64_t (*seek)(void *opaque, int64_t offset, int whence))
44 s->buffer_size = buffer_size;
47 url_resetbuf(s, write_flag ? URL_WRONLY : URL_RDONLY);
48 s->write_packet = write_packet;
49 s->read_packet = read_packet;
56 s->max_packet_size = 0;
57 s->update_checksum= NULL;
58 if(!read_packet && !write_flag){
60 s->buf_end = s->buffer + buffer_size;
67 ByteIOContext *av_alloc_put_byte(
68 unsigned char *buffer,
72 int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
73 int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
74 int64_t (*seek)(void *opaque, int64_t offset, int whence))
76 ByteIOContext *s = av_mallocz(sizeof(ByteIOContext));
77 init_put_byte(s, buffer, buffer_size, write_flag, opaque,
78 read_packet, write_packet, seek);
82 static void flush_buffer(ByteIOContext *s)
84 if (s->buf_ptr > s->buffer) {
85 if (s->write_packet && !s->error){
86 int ret= s->write_packet(s->opaque, s->buffer, s->buf_ptr - s->buffer);
91 if(s->update_checksum){
92 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
93 s->checksum_ptr= s->buffer;
95 s->pos += s->buf_ptr - s->buffer;
97 s->buf_ptr = s->buffer;
100 void put_byte(ByteIOContext *s, int b)
103 if (s->buf_ptr >= s->buf_end)
107 void put_buffer(ByteIOContext *s, const unsigned char *buf, int size)
112 len = (s->buf_end - s->buf_ptr);
115 memcpy(s->buf_ptr, buf, len);
118 if (s->buf_ptr >= s->buf_end)
126 void put_flush_packet(ByteIOContext *s)
132 int64_t url_fseek(ByteIOContext *s, int64_t offset, int whence)
138 return AVERROR(EINVAL);
140 pos = s->pos - (s->write_flag ? 0 : (s->buf_end - s->buffer));
142 if (whence != SEEK_CUR && whence != SEEK_SET)
143 return AVERROR(EINVAL);
145 if (whence == SEEK_CUR) {
146 offset1 = pos + (s->buf_ptr - s->buffer);
151 offset1 = offset - pos;
152 if (!s->must_flush &&
153 offset1 >= 0 && offset1 <= (s->buf_end - s->buffer)) {
154 /* can do the seek inside the buffer */
155 s->buf_ptr = s->buffer + offset1;
156 } else if(s->is_streamed && !s->write_flag &&
157 offset1 >= 0 && offset1 < (s->buf_end - s->buffer) + (1<<16)){
158 while(s->pos < offset && !s->eof_reached)
161 return AVERROR(EPIPE);
162 s->buf_ptr = s->buf_end + offset - s->pos;
164 int64_t res = AVERROR(EPIPE);
166 #if CONFIG_MUXERS || CONFIG_NETWORK
171 #endif /* CONFIG_MUXERS || CONFIG_NETWORK */
172 if (!s->seek || (res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
175 s->buf_end = s->buffer;
176 s->buf_ptr = s->buffer;
183 void url_fskip(ByteIOContext *s, int64_t offset)
185 url_fseek(s, offset, SEEK_CUR);
188 int64_t url_ftell(ByteIOContext *s)
190 return url_fseek(s, 0, SEEK_CUR);
193 int64_t url_fsize(ByteIOContext *s)
198 return AVERROR(EINVAL);
201 return AVERROR(EPIPE);
202 size = s->seek(s->opaque, 0, AVSEEK_SIZE);
204 if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
207 s->seek(s->opaque, s->pos, SEEK_SET);
212 int url_feof(ByteIOContext *s)
216 return s->eof_reached;
219 int url_ferror(ByteIOContext *s)
226 void put_le32(ByteIOContext *s, unsigned int val)
229 put_byte(s, val >> 8);
230 put_byte(s, val >> 16);
231 put_byte(s, val >> 24);
234 void put_be32(ByteIOContext *s, unsigned int val)
236 put_byte(s, val >> 24);
237 put_byte(s, val >> 16);
238 put_byte(s, val >> 8);
242 void put_strz(ByteIOContext *s, const char *str)
245 put_buffer(s, (const unsigned char *) str, strlen(str) + 1);
250 void put_le64(ByteIOContext *s, uint64_t val)
252 put_le32(s, (uint32_t)(val & 0xffffffff));
253 put_le32(s, (uint32_t)(val >> 32));
256 void put_be64(ByteIOContext *s, uint64_t val)
258 put_be32(s, (uint32_t)(val >> 32));
259 put_be32(s, (uint32_t)(val & 0xffffffff));
262 void put_le16(ByteIOContext *s, unsigned int val)
265 put_byte(s, val >> 8);
268 void put_be16(ByteIOContext *s, unsigned int val)
270 put_byte(s, val >> 8);
274 void put_le24(ByteIOContext *s, unsigned int val)
276 put_le16(s, val & 0xffff);
277 put_byte(s, val >> 16);
280 void put_be24(ByteIOContext *s, unsigned int val)
282 put_be16(s, val >> 8);
286 void put_tag(ByteIOContext *s, const char *tag)
295 static void fill_buffer(ByteIOContext *s)
297 uint8_t *dst= !s->max_packet_size && s->buf_end - s->buffer < s->buffer_size ? s->buf_ptr : s->buffer;
298 int len= s->buffer_size - (dst - s->buffer);
300 assert(s->buf_ptr == s->buf_end);
302 /* no need to do anything if EOF already reached */
306 if(s->update_checksum && dst == s->buffer){
307 if(s->buf_end > s->checksum_ptr)
308 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_end - s->checksum_ptr);
309 s->checksum_ptr= s->buffer;
313 len = s->read_packet(s->opaque, dst, len);
317 /* do not modify buffer if EOF reached so that a seek back can
318 be done without rereading data */
325 s->buf_end = dst + len;
329 unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
332 return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
335 unsigned long get_checksum(ByteIOContext *s)
337 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
338 s->update_checksum= NULL;
342 void init_checksum(ByteIOContext *s,
343 unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
344 unsigned long checksum)
346 s->update_checksum= update_checksum;
347 if(s->update_checksum){
348 s->checksum= checksum;
349 s->checksum_ptr= s->buf_ptr;
353 /* XXX: put an inline version */
354 int get_byte(ByteIOContext *s)
356 if (s->buf_ptr < s->buf_end) {
357 return *s->buf_ptr++;
360 if (s->buf_ptr < s->buf_end)
361 return *s->buf_ptr++;
367 int url_fgetc(ByteIOContext *s)
369 if (s->buf_ptr < s->buf_end) {
370 return *s->buf_ptr++;
373 if (s->buf_ptr < s->buf_end)
374 return *s->buf_ptr++;
380 int get_buffer(ByteIOContext *s, unsigned char *buf, int size)
386 len = s->buf_end - s->buf_ptr;
390 if(size > s->buffer_size && !s->update_checksum){
392 len = s->read_packet(s->opaque, buf, size);
394 /* do not modify buffer if EOF reached so that a seek back can
395 be done without rereading data */
404 s->buf_ptr = s->buffer;
405 s->buf_end = s->buffer/* + len*/;
409 len = s->buf_end - s->buf_ptr;
414 memcpy(buf, s->buf_ptr, len);
423 int get_partial_buffer(ByteIOContext *s, unsigned char *buf, int size)
430 len = s->buf_end - s->buf_ptr;
433 len = s->buf_end - s->buf_ptr;
437 memcpy(buf, s->buf_ptr, len);
442 unsigned int get_le16(ByteIOContext *s)
446 val |= get_byte(s) << 8;
450 unsigned int get_le24(ByteIOContext *s)
454 val |= get_byte(s) << 16;
458 unsigned int get_le32(ByteIOContext *s)
462 val |= get_le16(s) << 16;
466 uint64_t get_le64(ByteIOContext *s)
469 val = (uint64_t)get_le32(s);
470 val |= (uint64_t)get_le32(s) << 32;
474 unsigned int get_be16(ByteIOContext *s)
477 val = get_byte(s) << 8;
482 unsigned int get_be24(ByteIOContext *s)
485 val = get_be16(s) << 8;
489 unsigned int get_be32(ByteIOContext *s)
492 val = get_be16(s) << 16;
497 char *get_strz(ByteIOContext *s, char *buf, int maxlen)
502 while ((c = get_byte(s))) {
507 buf[i] = 0; /* Ensure null terminated, but may be truncated */
512 uint64_t get_be64(ByteIOContext *s)
515 val = (uint64_t)get_be32(s) << 32;
516 val |= (uint64_t)get_be32(s);
520 uint64_t ff_get_v(ByteIOContext *bc){
526 val= (val<<7) + (tmp&127);
531 int url_fdopen(ByteIOContext **s, URLContext *h)
534 int buffer_size, max_packet_size;
537 max_packet_size = url_get_max_packet_size(h);
538 if (max_packet_size) {
539 buffer_size = max_packet_size; /* no need to bufferize more than one packet */
541 buffer_size = IO_BUFFER_SIZE;
543 buffer = memalign(sysconf(_SC_PAGESIZE), buffer_size);
545 return AVERROR(ENOMEM);
547 *s = av_mallocz(sizeof(ByteIOContext));
550 return AVERROR(ENOMEM);
553 if (init_put_byte(*s, buffer, buffer_size,
554 (h->flags & URL_WRONLY || h->flags & URL_RDWR), h,
555 url_read, url_write, url_seek) < 0) {
560 (*s)->is_streamed = h->is_streamed;
561 (*s)->max_packet_size = max_packet_size;
563 (*s)->read_pause = (int (*)(void *, int))h->prot->url_read_pause;
564 (*s)->read_seek = (int64_t (*)(void *, int, int64_t, int))h->prot->url_read_seek;
569 int url_setbufsize(ByteIOContext *s, int buf_size)
572 buffer = av_malloc(buf_size);
574 return AVERROR(ENOMEM);
578 s->buffer_size = buf_size;
580 url_resetbuf(s, s->write_flag ? URL_WRONLY : URL_RDONLY);
584 int url_resetbuf(ByteIOContext *s, int flags)
586 URLContext *h = s->opaque;
587 if ((flags & URL_RDWR) || (h && h->flags != flags && !h->flags & URL_RDWR))
588 return AVERROR(EINVAL);
590 if (flags & URL_WRONLY) {
591 s->buf_end = s->buffer + s->buffer_size;
594 s->buf_end = s->buffer;
600 int url_fopen(ByteIOContext **s, const char *filename, int flags)
605 err = url_open(&h, filename, flags);
608 err = url_fdopen(s, h);
616 int url_fclose(ByteIOContext *s)
618 URLContext *h = s->opaque;
625 URLContext *url_fileno(ByteIOContext *s)
631 int url_fprintf(ByteIOContext *s, const char *fmt, ...)
638 ret = vsnprintf(buf, sizeof(buf), fmt, ap);
640 put_buffer(s, buf, strlen(buf));
643 #endif //CONFIG_MUXERS
645 char *url_fgets(ByteIOContext *s, char *buf, int buf_size)
655 if (c == EOF || c == '\n')
657 if ((q - buf) < buf_size - 1)
666 int url_fget_max_packet_size(ByteIOContext *s)
668 return s->max_packet_size;
671 int av_url_read_fpause(ByteIOContext *s, int pause)
674 return AVERROR(ENOSYS);
675 return s->read_pause(s->opaque, pause);
678 int64_t av_url_read_fseek(ByteIOContext *s, int stream_index,
679 int64_t timestamp, int flags)
681 URLContext *h = s->opaque;
684 return AVERROR(ENOSYS);
685 ret = s->read_seek(h, stream_index, timestamp, flags);
687 s->buf_ptr = s->buf_end; // Flush buffer
688 s->pos = s->seek(h, 0, SEEK_CUR);
693 /* url_open_dyn_buf and url_close_dyn_buf are used in rtp.c to send a response
694 * back to the server even if CONFIG_MUXERS is false. */
695 #if CONFIG_MUXERS || CONFIG_NETWORK
696 /* buffer handling */
697 int url_open_buf(ByteIOContext **s, uint8_t *buf, int buf_size, int flags)
700 *s = av_mallocz(sizeof(ByteIOContext));
702 return AVERROR(ENOMEM);
703 ret = init_put_byte(*s, buf, buf_size,
704 (flags & URL_WRONLY || flags & URL_RDWR),
705 NULL, NULL, NULL, NULL);
711 int url_close_buf(ByteIOContext *s)
714 return s->buf_ptr - s->buffer;
717 /* output in a dynamic buffer */
719 typedef struct DynBuffer {
720 int pos, size, allocated_size;
723 uint8_t io_buffer[1];
726 static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
728 DynBuffer *d = opaque;
729 unsigned new_size, new_allocated_size;
731 /* reallocate buffer if needed */
732 new_size = d->pos + buf_size;
733 new_allocated_size = d->allocated_size;
734 if(new_size < d->pos || new_size > INT_MAX/2)
736 while (new_size > new_allocated_size) {
737 if (!new_allocated_size)
738 new_allocated_size = new_size;
740 new_allocated_size += new_allocated_size / 2 + 1;
743 if (new_allocated_size > d->allocated_size) {
744 d->buffer = av_realloc(d->buffer, new_allocated_size);
745 if(d->buffer == NULL)
746 return AVERROR(ENOMEM);
747 d->allocated_size = new_allocated_size;
749 memcpy(d->buffer + d->pos, buf, buf_size);
751 if (d->pos > d->size)
756 static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
758 unsigned char buf1[4];
761 /* packetized write: output the header */
762 AV_WB32(buf1, 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)
789 unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024;
791 if(sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
793 d = av_mallocz(sizeof(DynBuffer) + io_buffer_size);
795 return AVERROR(ENOMEM);
796 *s = av_mallocz(sizeof(ByteIOContext));
799 return AVERROR(ENOMEM);
801 d->io_buffer_size = io_buffer_size;
802 ret = init_put_byte(*s, d->io_buffer, io_buffer_size,
804 max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
805 max_packet_size ? NULL : dyn_buf_seek);
807 (*s)->max_packet_size = max_packet_size;
815 int url_open_dyn_buf(ByteIOContext **s)
817 return url_open_dyn_buf_internal(s, 0);
820 int url_open_dyn_packet_buf(ByteIOContext **s, int max_packet_size)
822 if (max_packet_size <= 0)
824 return url_open_dyn_buf_internal(s, max_packet_size);
827 int url_close_dyn_buf(ByteIOContext *s, uint8_t **pbuffer)
829 DynBuffer *d = s->opaque;
834 *pbuffer = d->buffer;
840 #endif /* CONFIG_MUXERS || CONFIG_NETWORK */