0,0 → 1,221 |
/* |
* buffered file I/O |
* Copyright (c) 2001 Fabrice Bellard |
* |
* This file is part of FFmpeg. |
* |
* FFmpeg is free software; you can redistribute it and/or |
* modify it under the terms of the GNU Lesser General Public |
* License as published by the Free Software Foundation; either |
* version 2.1 of the License, or (at your option) any later version. |
* |
* FFmpeg is distributed in the hope that it will be useful, |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
* Lesser General Public License for more details. |
* |
* You should have received a copy of the GNU Lesser General Public |
* License along with FFmpeg; if not, write to the Free Software |
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
*/ |
|
#include "libavutil/avstring.h" |
#include "libavutil/internal.h" |
#include "libavutil/opt.h" |
#include "avformat.h" |
#include <fcntl.h> |
//#if HAVE_IO_H |
//#include <io.h> |
//#endif |
#if HAVE_UNISTD_H |
#include <unistd.h> |
#endif |
#include <sys/stat.h> |
#include <stdlib.h> |
#include "os_support.h" |
#include "url.h" |
|
/* Some systems may not have S_ISFIFO */ |
#ifndef S_ISFIFO |
# ifdef S_IFIFO |
# define S_ISFIFO(m) (((m) & S_IFMT) == S_IFIFO) |
# else |
# define S_ISFIFO(m) 0 |
# endif |
#endif |
|
/* standard file protocol */ |
|
typedef struct FileContext { |
const AVClass *class; |
int fd; |
int trunc; |
int blocksize; |
} FileContext; |
|
static const AVOption file_options[] = { |
{ "truncate", "Truncate existing files on write", offsetof(FileContext, trunc), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, AV_OPT_FLAG_ENCODING_PARAM }, |
{ "blocksize", "set I/O operation maximum block size", offsetof(FileContext, blocksize), AV_OPT_TYPE_INT, { .i64 = INT_MAX }, 1, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM }, |
{ NULL } |
}; |
|
static const AVOption pipe_options[] = { |
{ "blocksize", "set I/O operation maximum block size", offsetof(FileContext, blocksize), AV_OPT_TYPE_INT, { .i64 = INT_MAX }, 1, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM }, |
{ NULL } |
}; |
|
static const AVClass file_class = { |
.class_name = "file", |
.item_name = av_default_item_name, |
.option = file_options, |
.version = LIBAVUTIL_VERSION_INT, |
}; |
|
static const AVClass pipe_class = { |
.class_name = "pipe", |
.item_name = av_default_item_name, |
.option = pipe_options, |
.version = LIBAVUTIL_VERSION_INT, |
}; |
|
static int file_read(URLContext *h, unsigned char *buf, int size) |
{ |
FileContext *c = h->priv_data; |
int r; |
size = FFMIN(size, c->blocksize); |
r = read(c->fd, buf, size); |
return (-1 == r)?AVERROR(errno):r; |
} |
|
static int file_write(URLContext *h, const unsigned char *buf, int size) |
{ |
FileContext *c = h->priv_data; |
int r; |
size = FFMIN(size, c->blocksize); |
r = write(c->fd, buf, size); |
return (-1 == r)?AVERROR(errno):r; |
} |
|
static int file_get_handle(URLContext *h) |
{ |
FileContext *c = h->priv_data; |
return c->fd; |
} |
|
static int file_check(URLContext *h, int mask) |
{ |
|
|
return AVIO_FLAG_READ | AVIO_FLAG_WRITE ; |
} |
|
#if CONFIG_FILE_PROTOCOL |
|
static int file_open(URLContext *h, const char *filename, int flags) |
{ |
FileContext *c = h->priv_data; |
int access; |
int fd; |
struct stat st; |
|
av_strstart(filename, "file:", &filename); |
|
if (flags & AVIO_FLAG_WRITE && flags & AVIO_FLAG_READ) { |
access = O_CREAT | O_RDWR; |
if (c->trunc) |
access |= O_TRUNC; |
} else if (flags & AVIO_FLAG_WRITE) { |
access = O_CREAT | O_WRONLY; |
if (c->trunc) |
access |= O_TRUNC; |
} else { |
access = O_RDONLY; |
} |
#ifdef O_BINARY |
access |= O_BINARY; |
#endif |
fd = avpriv_open(filename, access, 0666); |
if (fd == -1) |
return AVERROR(errno); |
c->fd = fd; |
|
h->is_streamed = !fstat(fd, &st) && S_ISFIFO(st.st_mode); |
|
return 0; |
} |
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/* XXX: use llseek */ |
static int64_t file_seek(URLContext *h, int64_t pos, int whence) |
{ |
FileContext *c = h->priv_data; |
int64_t ret; |
|
if (whence == AVSEEK_SIZE) { |
struct stat st; |
ret = fstat(c->fd, &st); |
return ret < 0 ? AVERROR(errno) : (S_ISFIFO(st.st_mode) ? 0 : st.st_size); |
} |
|
ret = lseek(c->fd, pos, whence); |
|
return ret < 0 ? AVERROR(errno) : ret; |
} |
|
static int file_close(URLContext *h) |
{ |
FileContext *c = h->priv_data; |
return close(c->fd); |
} |
|
URLProtocol ff_file_protocol = { |
.name = "file", |
.url_open = file_open, |
.url_read = file_read, |
.url_write = file_write, |
.url_seek = file_seek, |
.url_close = file_close, |
.url_get_file_handle = file_get_handle, |
.url_check = file_check, |
.priv_data_size = sizeof(FileContext), |
.priv_data_class = &file_class, |
}; |
|
#endif /* CONFIG_FILE_PROTOCOL */ |
|
#if CONFIG_PIPE_PROTOCOL |
|
static int pipe_open(URLContext *h, const char *filename, int flags) |
{ |
FileContext *c = h->priv_data; |
int fd; |
char *final; |
av_strstart(filename, "pipe:", &filename); |
|
fd = strtol(filename, &final, 10); |
if((filename == final) || *final ) {/* No digits found, or something like 10ab */ |
if (flags & AVIO_FLAG_WRITE) { |
fd = 1; |
} else { |
fd = 0; |
} |
} |
#if HAVE_SETMODE |
setmode(fd, O_BINARY); |
#endif |
c->fd = fd; |
h->is_streamed = 1; |
return 0; |
} |
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URLProtocol ff_pipe_protocol = { |
.name = "pipe", |
.url_open = pipe_open, |
.url_read = file_read, |
.url_write = file_write, |
.url_get_file_handle = file_get_handle, |
.url_check = file_check, |
.priv_data_size = sizeof(FileContext), |
.priv_data_class = &pipe_class, |
}; |
|
#endif /* CONFIG_PIPE_PROTOCOL */ |