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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/stat.h>
00030 #include <sys/time.h>
00031 #include <stdlib.h>
00032 #include "os_support.h"
00033 
00034 
00035 /* standard file protocol */
00036 
00037 static int file_open(URLContext *h, const char *filename, int flags)
00038 {
00039     int access;
00040     int fd;
00041 
00042     av_strstart(filename, "file:", &filename);
00043 
00044     if (flags & URL_RDWR) {
00045         access = O_CREAT | O_TRUNC | O_RDWR;
00046     } else if (flags & URL_WRONLY) {
00047         access = O_CREAT | O_TRUNC | O_WRONLY;
00048     } else {
00049         access = O_RDONLY;
00050     }
00051 #ifdef O_BINARY
00052     access |= O_BINARY;
00053 #endif
00054     fd = open(filename, access, 0666);
00055     if (fd == -1)
00056         return AVERROR(errno);
00057     h->priv_data = (void *) (intptr_t) fd;
00058     return 0;
00059 }
00060 
00061 static int file_read(URLContext *h, unsigned char *buf, int size)
00062 {
00063     int fd = (intptr_t) h->priv_data;
00064     return read(fd, buf, size);
00065 }
00066 
00067 static int file_write(URLContext *h, unsigned char *buf, int size)
00068 {
00069     int fd = (intptr_t) h->priv_data;
00070     return write(fd, buf, size);
00071 }
00072 
00073 /* XXX: use llseek */
00074 static int64_t file_seek(URLContext *h, int64_t pos, int whence)
00075 {
00076     int fd = (intptr_t) h->priv_data;
00077     if (whence == AVSEEK_SIZE) {
00078         struct stat st;
00079         int ret = fstat(fd, &st);
00080         return ret < 0 ? AVERROR(errno) : st.st_size;
00081     }
00082     return lseek(fd, pos, whence);
00083 }
00084 
00085 static int file_close(URLContext *h)
00086 {
00087     int fd = (intptr_t) h->priv_data;
00088     return close(fd);
00089 }
00090 
00091 static int file_get_handle(URLContext *h)
00092 {
00093     return (intptr_t) h->priv_data;
00094 }
00095 
00096 URLProtocol file_protocol = {
00097     "file",
00098     file_open,
00099     file_read,
00100     file_write,
00101     file_seek,
00102     file_close,
00103     .url_get_file_handle = file_get_handle,
00104 };
00105 
00106 /* pipe protocol */
00107 
00108 static int pipe_open(URLContext *h, const char *filename, int flags)
00109 {
00110     int fd;
00111     char *final;
00112     av_strstart(filename, "pipe:", &filename);
00113 
00114     fd = strtol(filename, &final, 10);
00115     if((filename == final) || *final ) {/* No digits found, or something like 10ab */
00116         if (flags & URL_WRONLY) {
00117             fd = 1;
00118         } else {
00119             fd = 0;
00120         }
00121     }
00122 #if HAVE_SETMODE
00123     setmode(fd, O_BINARY);
00124 #endif
00125     h->priv_data = (void *) (intptr_t) fd;
00126     h->is_streamed = 1;
00127     return 0;
00128 }
00129 
00130 URLProtocol pipe_protocol = {
00131     "pipe",
00132     pipe_open,
00133     file_read,
00134     file_write,
00135     .url_get_file_handle = file_get_handle,
00136 };

Generated on Fri Sep 16 2011 17:17:48 for FFmpeg by  doxygen 1.7.1