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libavformat/file.c

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00001 /*
00002  * Buffered file io for ffmpeg system
00003  * Copyright (c) 2001 Fabrice Bellard
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 #include "libavutil/avstring.h"
00023 #include "avformat.h"
00024 #include <fcntl.h>
00025 #if HAVE_SETMODE
00026 #include <io.h>
00027 #endif
00028 #include <unistd.h>
00029 #include <sys/time.h>
00030 #include <stdlib.h>
00031 #include "os_support.h"
00032 
00033 
00034 /* standard file protocol */
00035 
00036 static int file_open(URLContext *h, const char *filename, int flags)
00037 {
00038     int access;
00039     int fd;
00040 
00041     av_strstart(filename, "file:", &filename);
00042 
00043     if (flags & URL_RDWR) {
00044         access = O_CREAT | O_TRUNC | O_RDWR;
00045     } else if (flags & URL_WRONLY) {
00046         access = O_CREAT | O_TRUNC | O_WRONLY;
00047     } else {
00048         access = O_RDONLY;
00049     }
00050 #ifdef O_BINARY
00051     access |= O_BINARY;
00052 #endif
00053     fd = open(filename, access, 0666);
00054     if (fd < 0)
00055         return AVERROR(ENOENT);
00056     h->priv_data = (void *)(size_t)fd;
00057     return 0;
00058 }
00059 
00060 static int file_read(URLContext *h, unsigned char *buf, int size)
00061 {
00062     int fd = (size_t)h->priv_data;
00063     return read(fd, buf, size);
00064 }
00065 
00066 static int file_write(URLContext *h, unsigned char *buf, int size)
00067 {
00068     int fd = (size_t)h->priv_data;
00069     return write(fd, buf, size);
00070 }
00071 
00072 /* XXX: use llseek */
00073 static int64_t file_seek(URLContext *h, int64_t pos, int whence)
00074 {
00075     int fd = (size_t)h->priv_data;
00076     return lseek(fd, pos, whence);
00077 }
00078 
00079 static int file_close(URLContext *h)
00080 {
00081     int fd = (size_t)h->priv_data;
00082     return close(fd);
00083 }
00084 
00085 URLProtocol file_protocol = {
00086     "file",
00087     file_open,
00088     file_read,
00089     file_write,
00090     file_seek,
00091     file_close,
00092 };
00093 
00094 /* pipe protocol */
00095 
00096 static int pipe_open(URLContext *h, const char *filename, int flags)
00097 {
00098     int fd;
00099     char *final;
00100     av_strstart(filename, "pipe:", &filename);
00101 
00102     fd = strtol(filename, &final, 10);
00103     if((filename == final) || *final ) {/* No digits found, or something like 10ab */
00104         if (flags & URL_WRONLY) {
00105             fd = 1;
00106         } else {
00107             fd = 0;
00108         }
00109     }
00110 #if HAVE_SETMODE
00111     setmode(fd, O_BINARY);
00112 #endif
00113     h->priv_data = (void *)(size_t)fd;
00114     h->is_streamed = 1;
00115     return 0;
00116 }
00117 
00118 URLProtocol pipe_protocol = {
00119     "pipe",
00120     pipe_open,
00121     file_read,
00122     file_write,
00123 };

Generated on Tue Nov 4 2014 12:59:23 for ffmpeg by  doxygen 1.7.1