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_o_direct(ByteIOContext *s)
86 size_t data_len = s->buf_ptr - s->buffer;
87 size_t to_write = data_len & ~(BLOCK_SIZE - 1);
91 to_write = (data_len + BLOCK_SIZE - 1) & ~(BLOCK_SIZE - 1);
94 av_log(NULL, AV_LOG_ERROR, " really writing %zx\n", to_write);
96 if (s->write_packet && !s->error){
97 int ret= s->write_packet(s->opaque, s->buffer, to_write);
102 if(s->update_checksum){
103 av_log(NULL, AV_LOG_ERROR, "Checksumming not implemented in O_DIRECT patch\n");
104 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
105 s->checksum_ptr= s->buffer;
108 if (data_len > to_write) {
109 /* flush_all was not set */
110 memcpy(s->buffer, &s->buffer[to_write], data_len - to_write);
111 s->buf_ptr -= to_write;
113 s->buf_ptr = s->buffer;
115 //av_log(NULL, AV_LOG_ERROR, "ZZZ tw=%zu, pos=%zd\n", to_write, s->pos);
119 static void flush_buffer(ByteIOContext *s)
121 av_log(NULL, AV_LOG_ERROR, "WRITE %p: pos=%zx len=%zx\n", s, s->pos, s->buf_ptr - s->buffer);
122 if (s->o_direct_flag) {
123 flush_buffer_o_direct(s);
126 if (s->buf_ptr > s->buffer) {
127 if (s->write_packet && !s->error){
128 int ret= s->write_packet(s->opaque, s->buffer, s->buf_ptr - s->buffer);
133 if(s->update_checksum){
134 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
135 s->checksum_ptr= s->buffer;
137 s->pos += s->buf_ptr - s->buffer;
139 s->buf_ptr = s->buffer;
142 void put_byte(ByteIOContext *s, int b)
145 if (s->buf_ptr >= s->buf_end)
149 void put_buffer(ByteIOContext *s, const unsigned char *buf, int size)
154 len = (s->buf_end - s->buf_ptr);
157 memcpy(s->buf_ptr, buf, len);
160 if (s->buf_ptr >= s->buf_end)
168 void put_flush_packet(ByteIOContext *s)
174 int64_t url_fseek(ByteIOContext *s, int64_t offset, int whence)
180 return AVERROR(EINVAL);
182 pos = s->pos - (s->write_flag ? 0 : (s->buf_end - s->buffer));
184 if (whence != SEEK_CUR && whence != SEEK_SET)
185 return AVERROR(EINVAL);
187 if (whence == SEEK_CUR) {
188 offset1 = pos + (s->buf_ptr - s->buffer);
193 //if (s->o_direct_flag)
194 av_log(NULL, AV_LOG_ERROR, "SEEK %p: from %llx to %llx\n", s, pos, offset);
196 offset1 = offset - pos;
197 if (!s->must_flush &&
198 offset1 >= 0 && offset1 <= (s->buf_end - s->buffer)) {
199 /* can do the seek inside the buffer */
200 s->buf_ptr = s->buffer + offset1;
201 if (s->o_direct_flag)
202 av_log(NULL, AV_LOG_ERROR, "Internal seek by %llx\n", offset1);
203 } else if(s->is_streamed && !s->write_flag &&
204 offset1 >= 0 && offset1 < (s->buf_end - s->buffer) + (1<<16)){
205 while(s->pos < offset && !s->eof_reached)
208 return AVERROR(EPIPE);
209 s->buf_ptr = s->buf_end + offset - s->pos;
211 int64_t res = AVERROR(EPIPE);
213 #if CONFIG_MUXERS || CONFIG_NETWORK
219 #endif /* CONFIG_MUXERS || CONFIG_NETWORK */
220 if (s->o_direct_flag) {
221 /* Read the whole block from the seek destination */
222 offset1 = offset & ~(BLOCK_SIZE - 1);
223 if (!s->seek || (res = s->seek(s->opaque, offset1, SEEK_SET)) < 0)
225 av_log(NULL, AV_LOG_ERROR, "READ block from %llx\n", offset1);
226 if ((res = s->read_packet(s->opaque, s->buffer, BLOCK_SIZE)) < 0)
228 if (!s->seek || (res = s->seek(s->opaque, offset1, SEEK_SET)) < 0)
230 s->buf_ptr = s->buffer + offset - offset1;
233 if (!s->seek || (res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
236 s->buf_end = s->buffer;
237 s->buf_ptr = s->buffer;
245 void url_fskip(ByteIOContext *s, int64_t offset)
247 url_fseek(s, offset, SEEK_CUR);
250 int64_t url_ftell(ByteIOContext *s)
252 return url_fseek(s, 0, SEEK_CUR);
255 int64_t url_fsize(ByteIOContext *s)
260 return AVERROR(EINVAL);
263 return AVERROR(EPIPE);
264 size = s->seek(s->opaque, 0, AVSEEK_SIZE);
266 if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
269 s->seek(s->opaque, s->pos, SEEK_SET);
274 int url_feof(ByteIOContext *s)
278 return s->eof_reached;
281 int url_ferror(ByteIOContext *s)
288 void put_le32(ByteIOContext *s, unsigned int val)
291 put_byte(s, val >> 8);
292 put_byte(s, val >> 16);
293 put_byte(s, val >> 24);
296 void put_be32(ByteIOContext *s, unsigned int val)
298 put_byte(s, val >> 24);
299 put_byte(s, val >> 16);
300 put_byte(s, val >> 8);
304 void put_strz(ByteIOContext *s, const char *str)
307 put_buffer(s, (const unsigned char *) str, strlen(str) + 1);
312 void put_le64(ByteIOContext *s, uint64_t val)
314 put_le32(s, (uint32_t)(val & 0xffffffff));
315 put_le32(s, (uint32_t)(val >> 32));
318 void put_be64(ByteIOContext *s, uint64_t val)
320 put_be32(s, (uint32_t)(val >> 32));
321 put_be32(s, (uint32_t)(val & 0xffffffff));
324 void put_le16(ByteIOContext *s, unsigned int val)
327 put_byte(s, val >> 8);
330 void put_be16(ByteIOContext *s, unsigned int val)
332 put_byte(s, val >> 8);
336 void put_le24(ByteIOContext *s, unsigned int val)
338 put_le16(s, val & 0xffff);
339 put_byte(s, val >> 16);
342 void put_be24(ByteIOContext *s, unsigned int val)
344 put_be16(s, val >> 8);
348 void put_tag(ByteIOContext *s, const char *tag)
357 static void fill_buffer(ByteIOContext *s)
359 uint8_t *dst= !s->max_packet_size && s->buf_end - s->buffer < s->buffer_size ? s->buf_ptr : s->buffer;
360 int len= s->buffer_size - (dst - s->buffer);
362 assert(s->buf_ptr == s->buf_end);
364 /* no need to do anything if EOF already reached */
368 if(s->update_checksum && dst == s->buffer){
369 if(s->buf_end > s->checksum_ptr)
370 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_end - s->checksum_ptr);
371 s->checksum_ptr= s->buffer;
375 len = s->read_packet(s->opaque, dst, len);
379 /* do not modify buffer if EOF reached so that a seek back can
380 be done without rereading data */
387 s->buf_end = dst + len;
391 unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
394 return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
397 unsigned long get_checksum(ByteIOContext *s)
399 s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
400 s->update_checksum= NULL;
404 void init_checksum(ByteIOContext *s,
405 unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
406 unsigned long checksum)
408 s->update_checksum= update_checksum;
409 if(s->update_checksum){
410 s->checksum= checksum;
411 s->checksum_ptr= s->buf_ptr;
415 /* XXX: put an inline version */
416 int get_byte(ByteIOContext *s)
418 if (s->buf_ptr < s->buf_end) {
419 return *s->buf_ptr++;
422 if (s->buf_ptr < s->buf_end)
423 return *s->buf_ptr++;
429 int url_fgetc(ByteIOContext *s)
431 if (s->buf_ptr < s->buf_end) {
432 return *s->buf_ptr++;
435 if (s->buf_ptr < s->buf_end)
436 return *s->buf_ptr++;
442 int get_buffer(ByteIOContext *s, unsigned char *buf, int size)
448 len = s->buf_end - s->buf_ptr;
452 if(size > s->buffer_size && !s->update_checksum){
454 len = s->read_packet(s->opaque, buf, size);
456 /* do not modify buffer if EOF reached so that a seek back can
457 be done without rereading data */
466 s->buf_ptr = s->buffer;
467 s->buf_end = s->buffer/* + len*/;
471 len = s->buf_end - s->buf_ptr;
476 memcpy(buf, s->buf_ptr, len);
485 int get_partial_buffer(ByteIOContext *s, unsigned char *buf, int size)
492 len = s->buf_end - s->buf_ptr;
495 len = s->buf_end - s->buf_ptr;
499 memcpy(buf, s->buf_ptr, len);
504 unsigned int get_le16(ByteIOContext *s)
508 val |= get_byte(s) << 8;
512 unsigned int get_le24(ByteIOContext *s)
516 val |= get_byte(s) << 16;
520 unsigned int get_le32(ByteIOContext *s)
524 val |= get_le16(s) << 16;
528 uint64_t get_le64(ByteIOContext *s)
531 val = (uint64_t)get_le32(s);
532 val |= (uint64_t)get_le32(s) << 32;
536 unsigned int get_be16(ByteIOContext *s)
539 val = get_byte(s) << 8;
544 unsigned int get_be24(ByteIOContext *s)
547 val = get_be16(s) << 8;
551 unsigned int get_be32(ByteIOContext *s)
554 val = get_be16(s) << 16;
559 char *get_strz(ByteIOContext *s, char *buf, int maxlen)
564 while ((c = get_byte(s))) {
569 buf[i] = 0; /* Ensure null terminated, but may be truncated */
574 uint64_t get_be64(ByteIOContext *s)
577 val = (uint64_t)get_be32(s) << 32;
578 val |= (uint64_t)get_be32(s);
582 uint64_t ff_get_v(ByteIOContext *bc){
588 val= (val<<7) + (tmp&127);
593 int url_fdopen(ByteIOContext **s, URLContext *h)
596 int buffer_size, max_packet_size;
599 max_packet_size = url_get_max_packet_size(h);
600 if (max_packet_size) {
601 buffer_size = max_packet_size; /* no need to bufferize more than one packet */
603 buffer_size = IO_BUFFER_SIZE;
605 if (h->flags & URL_DIRECT) {
606 if ((h->flags & URL_RDWR) == 0)
607 return AVERROR(EINVAL); /* We need read beacuse of url_fseek() */
608 buffer_size = 2*buffer_size+BLOCK_SIZE;
609 buffer = memalign(sysconf(_SC_PAGESIZE), buffer_size);
611 buffer = av_malloc(buffer_size);
614 return AVERROR(ENOMEM);
616 *s = av_mallocz(sizeof(ByteIOContext));
619 return AVERROR(ENOMEM);
622 if (init_put_byte(*s, buffer, buffer_size,
623 (h->flags & URL_WRONLY || h->flags & URL_RDWR), h,
624 url_read, url_write, url_seek) < 0) {
629 (*s)->is_streamed = h->is_streamed;
630 (*s)->max_packet_size = max_packet_size;
631 (*s)->o_direct_flag = !!(h->flags & URL_DIRECT);
633 (*s)->read_pause = (int (*)(void *, int))h->prot->url_read_pause;
634 (*s)->read_seek = (int64_t (*)(void *, int, int64_t, int))h->prot->url_read_seek;
639 int url_setbufsize(ByteIOContext *s, int buf_size)
642 buffer = av_malloc(buf_size);
644 return AVERROR(ENOMEM);
648 s->buffer_size = buf_size;
650 url_resetbuf(s, s->write_flag ? URL_WRONLY : URL_RDONLY);
654 int url_resetbuf(ByteIOContext *s, int flags)
656 URLContext *h = s->opaque;
657 if ((flags & URL_RDWR) || (h && h->flags != flags && !h->flags & URL_RDWR))
658 return AVERROR(EINVAL);
660 if (flags & URL_WRONLY) {
661 s->buf_end = s->buffer + s->buffer_size;
664 s->buf_end = s->buffer;
670 int url_fopen(ByteIOContext **s, const char *filename, int flags)
675 err = url_open(&h, filename, flags);
678 err = url_fdopen(s, h);
686 int url_fclose(ByteIOContext *s)
688 URLContext *h = s->opaque;
695 URLContext *url_fileno(ByteIOContext *s)
701 int url_fprintf(ByteIOContext *s, const char *fmt, ...)
708 ret = vsnprintf(buf, sizeof(buf), fmt, ap);
710 put_buffer(s, buf, strlen(buf));
713 #endif //CONFIG_MUXERS
715 char *url_fgets(ByteIOContext *s, char *buf, int buf_size)
725 if (c == EOF || c == '\n')
727 if ((q - buf) < buf_size - 1)
736 int url_fget_max_packet_size(ByteIOContext *s)
738 return s->max_packet_size;
741 int av_url_read_fpause(ByteIOContext *s, int pause)
744 return AVERROR(ENOSYS);
745 return s->read_pause(s->opaque, pause);
748 int64_t av_url_read_fseek(ByteIOContext *s, int stream_index,
749 int64_t timestamp, int flags)
751 URLContext *h = s->opaque;
754 return AVERROR(ENOSYS);
755 ret = s->read_seek(h, stream_index, timestamp, flags);
757 s->buf_ptr = s->buf_end; // Flush buffer
758 s->pos = s->seek(h, 0, SEEK_CUR);
763 /* url_open_dyn_buf and url_close_dyn_buf are used in rtp.c to send a response
764 * back to the server even if CONFIG_MUXERS is false. */
765 #if CONFIG_MUXERS || CONFIG_NETWORK
766 /* buffer handling */
767 int url_open_buf(ByteIOContext **s, uint8_t *buf, int buf_size, int flags)
770 *s = av_mallocz(sizeof(ByteIOContext));
772 return AVERROR(ENOMEM);
773 ret = init_put_byte(*s, buf, buf_size,
774 (flags & URL_WRONLY || flags & URL_RDWR),
775 NULL, NULL, NULL, NULL);
781 int url_close_buf(ByteIOContext *s)
784 return s->buf_ptr - s->buffer;
787 /* output in a dynamic buffer */
789 typedef struct DynBuffer {
790 int pos, size, allocated_size;
793 uint8_t io_buffer[1];
796 static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
798 DynBuffer *d = opaque;
799 unsigned new_size, new_allocated_size;
801 /* reallocate buffer if needed */
802 new_size = d->pos + buf_size;
803 new_allocated_size = d->allocated_size;
804 if(new_size < d->pos || new_size > INT_MAX/2)
806 while (new_size > new_allocated_size) {
807 if (!new_allocated_size)
808 new_allocated_size = new_size;
810 new_allocated_size += new_allocated_size / 2 + 1;
813 if (new_allocated_size > d->allocated_size) {
814 d->buffer = av_realloc(d->buffer, new_allocated_size);
815 if(d->buffer == NULL)
816 return AVERROR(ENOMEM);
817 d->allocated_size = new_allocated_size;
819 memcpy(d->buffer + d->pos, buf, buf_size);
821 if (d->pos > d->size)
826 static int dyn_packet_buf_write(void *opaque, uint8_t *buf, int buf_size)
828 unsigned char buf1[4];
831 /* packetized write: output the header */
832 AV_WB32(buf1, buf_size);
833 ret= dyn_buf_write(opaque, buf1, 4);
838 return dyn_buf_write(opaque, buf, buf_size);
841 static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence)
843 DynBuffer *d = opaque;
845 if (whence == SEEK_CUR)
847 else if (whence == SEEK_END)
849 if (offset < 0 || offset > 0x7fffffffLL)
855 static int url_open_dyn_buf_internal(ByteIOContext **s, int max_packet_size)
859 unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024;
861 if(sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
863 d = av_mallocz(sizeof(DynBuffer) + io_buffer_size);
865 return AVERROR(ENOMEM);
866 *s = av_mallocz(sizeof(ByteIOContext));
869 return AVERROR(ENOMEM);
871 d->io_buffer_size = io_buffer_size;
872 ret = init_put_byte(*s, d->io_buffer, io_buffer_size,
874 max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
875 max_packet_size ? NULL : dyn_buf_seek);
877 (*s)->max_packet_size = max_packet_size;
885 int url_open_dyn_buf(ByteIOContext **s)
887 return url_open_dyn_buf_internal(s, 0);
890 int url_open_dyn_packet_buf(ByteIOContext **s, int max_packet_size)
892 if (max_packet_size <= 0)
894 return url_open_dyn_buf_internal(s, max_packet_size);
897 int url_close_dyn_buf(ByteIOContext *s, uint8_t **pbuffer)
899 DynBuffer *d = s->opaque;
904 *pbuffer = d->buffer;
910 #endif /* CONFIG_MUXERS || CONFIG_NETWORK */