libavformat/file.c

   1 /*
   2  * Buffered file io for ffmpeg system
   3  * Copyright (c) 2001 Fabrice Bellard
   4  *
   5  * This file is part of FFmpeg.
   6  *
   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.
  11  *
  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.
  16  *
  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
  20  */
  21 #include "avformat.h"
  22 #include "avstring.h"
  23 #include <fcntl.h>
  24 #include <unistd.h>
  25 #include <sys/time.h>
  26 #include <stdlib.h>
  27 #include "os_support.h"
  28
  29
  30 /* standard file protocol */
  31
  32 static int file_open(URLContext *h, const char *filename, int flags)
  33 {
  34     int access;
  35     int fd;
  36
  37     av_strstart(filename, "file:", &filename);
  38
  39     if (flags & URL_RDWR) {
  40         access = O_CREAT | O_TRUNC | O_RDWR;
  41     } else if (flags & URL_WRONLY) {
  42         access = O_CREAT | O_TRUNC | O_WRONLY;
  43     } else {
  44         access = O_RDONLY;
  45     }
  46 #ifdef O_BINARY
  47     access |= O_BINARY;
  48 #endif
  49     fd = open(filename, access, 0666);
  50     if (fd < 0)
  51         return AVERROR(ENOENT);
  52     h->priv_data = (void *)(size_t)fd;
  53     return 0;
  54 }
  55
  56 static int file_read(URLContext *h, unsigned char *buf, int size)
  57 {
  58     int fd = (size_t)h->priv_data;
  59     return read(fd, buf, size);
  60 }
  61
  62 static int file_write(URLContext *h, unsigned char *buf, int size)
  63 {
  64     int fd = (size_t)h->priv_data;
  65     return write(fd, buf, size);
  66 }
  67
  68 /* XXX: use llseek */
  69 static offset_t file_seek(URLContext *h, offset_t pos, int whence)
  70 {
  71     int fd = (size_t)h->priv_data;
  72     return lseek(fd, pos, whence);
  73 }
  74
  75 static int file_close(URLContext *h)
  76 {
  77     int fd = (size_t)h->priv_data;
  78     return close(fd);
  79 }
  80
  81 URLProtocol file_protocol = {
  82     "file",
  83     file_open,
  84     file_read,
  85     file_write,
  86     file_seek,
  87     file_close,
  88 };
  89
  90 /* pipe protocol */
  91
  92 static int pipe_open(URLContext *h, const char *filename, int flags)
  93 {
  94     int fd;
  95     const char * final;
  96     av_strstart(filename, "pipe:", &filename);
  97
  98     fd = strtol(filename, &final, 10);
  99     if((filename == final) || *final ) {/* No digits found, or something like 10ab */
 100         if (flags & URL_WRONLY) {
 101             fd = 1;
 102         } else {
 103             fd = 0;
 104         }
 105     }
 106 #ifdef O_BINARY
 107     setmode(fd, O_BINARY);
 108 #endif
 109     h->priv_data = (void *)(size_t)fd;
 110     h->is_streamed = 1;
 111     return 0;
 112 }
 113
 114 URLProtocol pipe_protocol = {
 115     "pipe",
 116     pipe_open,
 117     file_read,
 118     file_write,
 119 };