mirror of https://git.ffmpeg.org/ffmpeg.git
189 lines
4.7 KiB
C
189 lines
4.7 KiB
C
/*
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* buffered file I/O
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* Copyright (c) 2001 Fabrice Bellard
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/avstring.h"
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#include "libavutil/opt.h"
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#include "avformat.h"
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#include <fcntl.h>
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#if HAVE_IO_H
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#include <io.h>
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#endif
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <sys/stat.h>
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#include <stdlib.h>
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#include "os_support.h"
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#include "url.h"
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/* standard file protocol */
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typedef struct FileContext {
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const AVClass *class;
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int fd;
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int trunc;
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} FileContext;
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static const AVOption file_options[] = {
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{ "truncate", "Truncate existing files on write", offsetof(FileContext, trunc), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, AV_OPT_FLAG_ENCODING_PARAM },
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{ NULL }
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};
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static const AVClass file_class = {
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.class_name = "file",
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.item_name = av_default_item_name,
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.option = file_options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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static int file_read(URLContext *h, unsigned char *buf, int size)
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{
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FileContext *c = h->priv_data;
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return read(c->fd, buf, size);
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}
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static int file_write(URLContext *h, const unsigned char *buf, int size)
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{
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FileContext *c = h->priv_data;
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return write(c->fd, buf, size);
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}
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static int file_get_handle(URLContext *h)
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{
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FileContext *c = h->priv_data;
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return c->fd;
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}
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static int file_check(URLContext *h, int mask)
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{
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struct stat st;
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int ret = stat(h->filename, &st);
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if (ret < 0)
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return AVERROR(errno);
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ret |= st.st_mode&S_IRUSR ? mask&AVIO_FLAG_READ : 0;
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ret |= st.st_mode&S_IWUSR ? mask&AVIO_FLAG_WRITE : 0;
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return ret;
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}
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#if CONFIG_FILE_PROTOCOL
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static int file_open(URLContext *h, const char *filename, int flags)
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{
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FileContext *c = h->priv_data;
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int access;
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int fd;
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av_strstart(filename, "file:", &filename);
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if (flags & AVIO_FLAG_WRITE && flags & AVIO_FLAG_READ) {
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access = O_CREAT | O_RDWR;
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if (c->trunc)
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access |= O_TRUNC;
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} else if (flags & AVIO_FLAG_WRITE) {
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access = O_CREAT | O_WRONLY;
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if (c->trunc)
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access |= O_TRUNC;
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} else {
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access = O_RDONLY;
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}
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#ifdef O_BINARY
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access |= O_BINARY;
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#endif
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fd = open(filename, access, 0666);
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if (fd == -1)
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return AVERROR(errno);
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c->fd = fd;
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return 0;
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}
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/* XXX: use llseek */
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static int64_t file_seek(URLContext *h, int64_t pos, int whence)
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{
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FileContext *c = h->priv_data;
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if (whence == AVSEEK_SIZE) {
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struct stat st;
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int ret = fstat(c->fd, &st);
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return ret < 0 ? AVERROR(errno) : st.st_size;
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}
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return lseek(c->fd, pos, whence);
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}
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static int file_close(URLContext *h)
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{
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FileContext *c = h->priv_data;
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return close(c->fd);
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}
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URLProtocol ff_file_protocol = {
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.name = "file",
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.url_open = file_open,
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.url_read = file_read,
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.url_write = file_write,
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.url_seek = file_seek,
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.url_close = file_close,
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.url_get_file_handle = file_get_handle,
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.url_check = file_check,
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.priv_data_size = sizeof(FileContext),
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.priv_data_class = &file_class,
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};
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#endif /* CONFIG_FILE_PROTOCOL */
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#if CONFIG_PIPE_PROTOCOL
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static int pipe_open(URLContext *h, const char *filename, int flags)
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{
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FileContext *c = h->priv_data;
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int fd;
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char *final;
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av_strstart(filename, "pipe:", &filename);
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fd = strtol(filename, &final, 10);
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if((filename == final) || *final ) {/* No digits found, or something like 10ab */
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if (flags & AVIO_FLAG_WRITE) {
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fd = 1;
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} else {
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fd = 0;
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}
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}
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#if HAVE_SETMODE
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setmode(fd, O_BINARY);
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#endif
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c->fd = fd;
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h->is_streamed = 1;
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return 0;
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}
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URLProtocol ff_pipe_protocol = {
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.name = "pipe",
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.url_open = pipe_open,
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.url_read = file_read,
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.url_write = file_write,
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.url_get_file_handle = file_get_handle,
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.url_check = file_check,
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.priv_data_size = sizeof(FileContext),
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};
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#endif /* CONFIG_PIPE_PROTOCOL */
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