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 #define BLOCK_SIZE 512
84 static void flush_buffer(ByteIOContext *s)
86 size_t data_len = s->buf_ptr - s->buffer;
87 size_t to_write = (data_len + BLOCK_SIZE - 1) & ~(BLOCK_SIZE - 1);
88 int64_t res = AVERROR(EPIPE);
89 av_log(NULL, AV_LOG_ERROR, "YYY dl=%u, tw=%u\n", data_len, to_write);
90 if (s->buf_ptr > s->buffer) {
91 if (s->write_packet && !s->error){
92 int ret= s->write_packet(s->opaque, s->buffer, to_write);
97 if(s->update_checksum){
98 av_log(NULL, AV_LOG_ERROR, "Checksumming not implemented in O_DIRECT patch\n");
99 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
100 s->checksum_ptr= s->buffer;
102 s->pos += to_write - BLOCK_SIZE;
103 memcpy(s->buffer, &s->buffer[to_write], data_len - to_write + BLOCK_SIZE);
104 s->buf_ptr -= to_write - BLOCK_SIZE;
107 res = s->seek(s->opaque, s->pos, SEEK_SET);
109 av_log(NULL, AV_LOG_ERROR, "seek error inside flush_buffer: %lld\n", res);
110 av_log(NULL, AV_LOG_ERROR, "ZZZ tw=%u, pos=%d\n", to_write, s->pos);
114 void put_byte(ByteIOContext *s, int b)
117 if (s->buf_ptr >= s->buf_end)
121 void put_buffer(ByteIOContext *s, const unsigned char *buf, int size)
126 len = (s->buf_end - s->buf_ptr);
129 memcpy(s->buf_ptr, buf, len);
132 if (s->buf_ptr >= s->buf_end)
140 void put_flush_packet(ByteIOContext *s)
146 int64_t url_fseek(ByteIOContext *s, int64_t offset, int whence)
152 return AVERROR(EINVAL);
154 pos = s->pos - (s->write_flag ? 0 : (s->buf_end - s->buffer));
156 if (whence != SEEK_CUR && whence != SEEK_SET)
157 return AVERROR(EINVAL);
159 if (whence == SEEK_CUR) {
160 offset1 = pos + (s->buf_ptr - s->buffer);
165 av_log(NULL, AV_LOG_ERROR, "SEEK to %llu\n", offset);
167 offset1 = offset - pos;
168 if (!s->must_flush &&
169 offset1 >= 0 && offset1 <= (s->buf_end - s->buffer)) {
170 /* can do the seek inside the buffer */
171 s->buf_ptr = s->buffer + offset1;
172 } else if(s->is_streamed && !s->write_flag &&
173 offset1 >= 0 && offset1 < (s->buf_end - s->buffer) + (1<<16)){
174 while(s->pos < offset && !s->eof_reached)
177 return AVERROR(EPIPE);
178 s->buf_ptr = s->buf_end + offset - s->pos;
180 int64_t res = AVERROR(EPIPE);
182 #if CONFIG_MUXERS || CONFIG_NETWORK
187 #endif /* CONFIG_MUXERS || CONFIG_NETWORK */
188 #warning TODO read the whole block from the file to the buffer
189 if (!s->seek || (res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
192 s->buf_end = s->buffer;
193 s->buf_ptr = s->buffer;
200 void url_fskip(ByteIOContext *s, int64_t offset)
202 url_fseek(s, offset, SEEK_CUR);
205 int64_t url_ftell(ByteIOContext *s)
207 return url_fseek(s, 0, SEEK_CUR);
210 int64_t url_fsize(ByteIOContext *s)
215 return AVERROR(EINVAL);
218 return AVERROR(EPIPE);
219 size = s->seek(s->opaque, 0, AVSEEK_SIZE);
221 if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
224 s->seek(s->opaque, s->pos, SEEK_SET);
229 int url_feof(ByteIOContext *s)
233 return s->eof_reached;
236 int url_ferror(ByteIOContext *s)
243 void put_le32(ByteIOContext *s, unsigned int val)
246 put_byte(s, val >> 8);
247 put_byte(s, val >> 16);
248 put_byte(s, val >> 24);
251 void put_be32(ByteIOContext *s, unsigned int val)
253 put_byte(s, val >> 24);
254 put_byte(s, val >> 16);
255 put_byte(s, val >> 8);
259 void put_strz(ByteIOContext *s, const char *str)
262 put_buffer(s, (const unsigned char *) str, strlen(str) + 1);
267 void put_le64(ByteIOContext *s, uint64_t val)
269 put_le32(s, (uint32_t)(val & 0xffffffff));
270 put_le32(s, (uint32_t)(val >> 32));
273 void put_be64(ByteIOContext *s, uint64_t val)
275 put_be32(s, (uint32_t)(val >> 32));
276 put_be32(s, (uint32_t)(val & 0xffffffff));
279 void put_le16(ByteIOContext *s, unsigned int val)
282 put_byte(s, val >> 8);
285 void put_be16(ByteIOContext *s, unsigned int val)
287 put_byte(s, val >> 8);
291 void put_le24(ByteIOContext *s, unsigned int val)
293 put_le16(s, val & 0xffff);
294 put_byte(s, val >> 16);
297 void put_be24(ByteIOContext *s, unsigned int val)
299 put_be16(s, val >> 8);
303 void put_tag(ByteIOContext *s, const char *tag)
312 static void fill_buffer(ByteIOContext *s)
314 uint8_t *dst= !s->max_packet_size && s->buf_end - s->buffer < s->buffer_size ? s->buf_ptr : s->buffer;
315 int len= s->buffer_size - (dst - s->buffer);
317 assert(s->buf_ptr == s->buf_end);
319 /* no need to do anything if EOF already reached */
323 if(s->update_checksum && dst == s->buffer){
324 if(s->buf_end > s->checksum_ptr)
325 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_end - s->checksum_ptr);
326 s->checksum_ptr= s->buffer;
330 len = s->read_packet(s->opaque, dst, len);
334 /* do not modify buffer if EOF reached so that a seek back can
335 be done without rereading data */
342 s->buf_end = dst + len;
346 unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
349 return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
352 unsigned long get_checksum(ByteIOContext *s)
354 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
355 s->update_checksum= NULL;
359 void init_checksum(ByteIOContext *s,
360 unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
361 unsigned long checksum)
363 s->update_checksum= update_checksum;
364 if(s->update_checksum){
365 s->checksum= checksum;
366 s->checksum_ptr= s->buf_ptr;
370 /* XXX: put an inline version */
371 int get_byte(ByteIOContext *s)
373 if (s->buf_ptr < s->buf_end) {
374 return *s->buf_ptr++;
377 if (s->buf_ptr < s->buf_end)
378 return *s->buf_ptr++;
384 int url_fgetc(ByteIOContext *s)
386 if (s->buf_ptr < s->buf_end) {
387 return *s->buf_ptr++;
390 if (s->buf_ptr < s->buf_end)
391 return *s->buf_ptr++;
397 int get_buffer(ByteIOContext *s, unsigned char *buf, int size)
403 len = s->buf_end - s->buf_ptr;
407 if(size > s->buffer_size && !s->update_checksum){
409 len = s->read_packet(s->opaque, buf, size);
411 /* do not modify buffer if EOF reached so that a seek back can
412 be done without rereading data */
421 s->buf_ptr = s->buffer;
422 s->buf_end = s->buffer/* + len*/;
426 len = s->buf_end - s->buf_ptr;
431 memcpy(buf, s->buf_ptr, len);
440 int get_partial_buffer(ByteIOContext *s, unsigned char *buf, int size)
447 len = s->buf_end - s->buf_ptr;
450 len = s->buf_end - s->buf_ptr;
454 memcpy(buf, s->buf_ptr, len);
459 unsigned int get_le16(ByteIOContext *s)
463 val |= get_byte(s) << 8;
467 unsigned int get_le24(ByteIOContext *s)
471 val |= get_byte(s) << 16;
475 unsigned int get_le32(ByteIOContext *s)
479 val |= get_le16(s) << 16;
483 uint64_t get_le64(ByteIOContext *s)
486 val = (uint64_t)get_le32(s);
487 val |= (uint64_t)get_le32(s) << 32;
491 unsigned int get_be16(ByteIOContext *s)
494 val = get_byte(s) << 8;
499 unsigned int get_be24(ByteIOContext *s)
502 val = get_be16(s) << 8;
506 unsigned int get_be32(ByteIOContext *s)
509 val = get_be16(s) << 16;
514 char *get_strz(ByteIOContext *s, char *buf, int maxlen)
519 while ((c = get_byte(s))) {
524 buf[i] = 0; /* Ensure null terminated, but may be truncated */
529 uint64_t get_be64(ByteIOContext *s)
532 val = (uint64_t)get_be32(s) << 32;
533 val |= (uint64_t)get_be32(s);
537 uint64_t ff_get_v(ByteIOContext *bc){
543 val= (val<<7) + (tmp&127);
548 int url_fdopen(ByteIOContext **s, URLContext *h)
551 int buffer_size, max_packet_size;
554 max_packet_size = url_get_max_packet_size(h);
555 if (max_packet_size) {
556 buffer_size = max_packet_size; /* no need to bufferize more than one packet */
558 buffer_size = IO_BUFFER_SIZE;
560 buffer_size = 2*buffer_size+BLOCK_SIZE;
561 buffer = memalign(sysconf(_SC_PAGESIZE), buffer_size);
563 return AVERROR(ENOMEM);
565 *s = av_mallocz(sizeof(ByteIOContext));
568 return AVERROR(ENOMEM);
571 if (init_put_byte(*s, buffer, buffer_size,
572 (h->flags & URL_WRONLY || h->flags & URL_RDWR), h,
573 url_read, url_write, url_seek) < 0) {
578 (*s)->is_streamed = h->is_streamed;
579 (*s)->max_packet_size = max_packet_size;
581 (*s)->read_pause = (int (*)(void *, int))h->prot->url_read_pause;
582 (*s)->read_seek = (int64_t (*)(void *, int, int64_t, int))h->prot->url_read_seek;
587 int url_setbufsize(ByteIOContext *s, int buf_size)
590 buffer = av_malloc(buf_size);
592 return AVERROR(ENOMEM);
596 s->buffer_size = buf_size;
598 url_resetbuf(s, s->write_flag ? URL_WRONLY : URL_RDONLY);
602 int url_resetbuf(ByteIOContext *s, int flags)
604 URLContext *h = s->opaque;
605 if ((flags & URL_RDWR) || (h && h->flags != flags && !h->flags & URL_RDWR))
606 return AVERROR(EINVAL);
608 if (flags & URL_WRONLY) {
609 s->buf_end = s->buffer + s->buffer_size;
612 s->buf_end = s->buffer;
618 int url_fopen(ByteIOContext **s, const char *filename, int flags)
623 err = url_open(&h, filename, flags);
626 err = url_fdopen(s, h);
634 int url_fclose(ByteIOContext *s)
636 URLContext *h = s->opaque;
643 URLContext *url_fileno(ByteIOContext *s)
649 int url_fprintf(ByteIOContext *s, const char *fmt, ...)
656 ret = vsnprintf(buf, sizeof(buf), fmt, ap);
658 put_buffer(s, buf, strlen(buf));
661 #endif //CONFIG_MUXERS
663 char *url_fgets(ByteIOContext *s, char *buf, int buf_size)
673 if (c == EOF || c == '\n')
675 if ((q - buf) < buf_size - 1)
684 int url_fget_max_packet_size(ByteIOContext *s)
686 return s->max_packet_size;
689 int av_url_read_fpause(ByteIOContext *s, int pause)
692 return AVERROR(ENOSYS);
693 return s->read_pause(s->opaque, pause);
696 int64_t av_url_read_fseek(ByteIOContext *s, int stream_index,
697 int64_t timestamp, int flags)
699 URLContext *h = s->opaque;
702 return AVERROR(ENOSYS);
703 ret = s->read_seek(h, stream_index, timestamp, flags);
705 s->buf_ptr = s->buf_end; // Flush buffer
706 s->pos = s->seek(h, 0, SEEK_CUR);
711 /* url_open_dyn_buf and url_close_dyn_buf are used in rtp.c to send a response
712 * back to the server even if CONFIG_MUXERS is false. */
713 #if CONFIG_MUXERS || CONFIG_NETWORK
714 /* buffer handling */
715 int url_open_buf(ByteIOContext **s, uint8_t *buf, int buf_size, int flags)
718 *s = av_mallocz(sizeof(ByteIOContext));
720 return AVERROR(ENOMEM);
721 ret = init_put_byte(*s, buf, buf_size,
722 (flags & URL_WRONLY || flags & URL_RDWR),
723 NULL, NULL, NULL, NULL);
729 int url_close_buf(ByteIOContext *s)
732 return s->buf_ptr - s->buffer;
735 /* output in a dynamic buffer */
737 typedef struct DynBuffer {
738 int pos, size, allocated_size;
741 uint8_t io_buffer[1];
744 static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
746 DynBuffer *d = opaque;
747 unsigned new_size, new_allocated_size;
749 /* reallocate buffer if needed */
750 new_size = d->pos + buf_size;
751 new_allocated_size = d->allocated_size;
752 if(new_size < d->pos || new_size > INT_MAX/2)
754 while (new_size > new_allocated_size) {
755 if (!new_allocated_size)
756 new_allocated_size = new_size;
758 new_allocated_size += new_allocated_size / 2 + 1;
761 if (new_allocated_size > d->allocated_size) {
762 d->buffer = av_realloc(d->buffer, new_allocated_size);
763 if(d->buffer == NULL)
764 return AVERROR(ENOMEM);
765 d->allocated_size = new_allocated_size;
767 memcpy(d->buffer + d->pos, buf, buf_size);
769 if (d->pos > d->size)
774 static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
776 unsigned char buf1[4];
779 /* packetized write: output the header */
780 AV_WB32(buf1, buf_size);
781 ret= dyn_buf_write(opaque, buf1, 4);
786 return dyn_buf_write(opaque, buf, buf_size);
789 static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence)
791 DynBuffer *d = opaque;
793 if (whence == SEEK_CUR)
795 else if (whence == SEEK_END)
797 if (offset < 0 || offset > 0x7fffffffLL)
803 static int url_open_dyn_buf_internal(ByteIOContext **s, int max_packet_size)
807 unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024;
809 if(sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
811 d = av_mallocz(sizeof(DynBuffer) + io_buffer_size);
813 return AVERROR(ENOMEM);
814 *s = av_mallocz(sizeof(ByteIOContext));
817 return AVERROR(ENOMEM);
819 d->io_buffer_size = io_buffer_size;
820 ret = init_put_byte(*s, d->io_buffer, io_buffer_size,
822 max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
823 max_packet_size ? NULL : dyn_buf_seek);
825 (*s)->max_packet_size = max_packet_size;
833 int url_open_dyn_buf(ByteIOContext **s)
835 return url_open_dyn_buf_internal(s, 0);
838 int url_open_dyn_packet_buf(ByteIOContext **s, int max_packet_size)
840 if (max_packet_size <= 0)
842 return url_open_dyn_buf_internal(s, max_packet_size);
845 int url_close_dyn_buf(ByteIOContext *s, uint8_t **pbuffer)
847 DynBuffer *d = s->opaque;
852 *pbuffer = d->buffer;
858 #endif /* CONFIG_MUXERS || CONFIG_NETWORK */