3 * Copyright (c) 2001 Fabrice Bellard
5 * This file is part of FFmpeg.
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.
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.
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
22 #include "libavutil/avstring.h"
23 #include "libavutil/opt.h"
34 #include "os_support.h"
37 /* Some systems may not have S_ISFIFO */
40 # define S_ISFIFO(m) (((m) & S_IFMT) == S_IFIFO)
42 # define S_ISFIFO(m) 0
46 /* standard file protocol */
48 typedef struct FileContext {
54 static const AVOption file_options[] = {
55 { "truncate", "Truncate existing files on write", offsetof(FileContext, trunc), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, AV_OPT_FLAG_ENCODING_PARAM },
59 static const AVClass file_class = {
61 .item_name = av_default_item_name,
62 .option = file_options,
63 .version = LIBAVUTIL_VERSION_INT,
66 static int file_read(URLContext *h, unsigned char *buf, int size)
68 FileContext *c = h->priv_data;
69 int r = read(c->fd, buf, size);
70 return (-1 == r)?AVERROR(errno):r;
73 static int file_write(URLContext *h, const unsigned char *buf, int size)
75 FileContext *c = h->priv_data;
76 int r = write(c->fd, buf, size);
77 return (-1 == r)?AVERROR(errno):r;
80 static int file_get_handle(URLContext *h)
82 FileContext *c = h->priv_data;
86 static int file_check(URLContext *h, int mask)
88 #if HAVE_ACCESS && defined(R_OK)
90 if (access(h->filename, F_OK) < 0)
91 return AVERROR(errno);
92 if (mask&AVIO_FLAG_READ)
93 if (access(h->filename, R_OK) >= 0)
94 ret |= AVIO_FLAG_READ;
95 if (mask&AVIO_FLAG_WRITE)
96 if (access(h->filename, W_OK) >= 0)
97 ret |= AVIO_FLAG_WRITE;
100 int ret = stat(h->filename, &st);
102 return AVERROR(errno);
104 ret |= st.st_mode&S_IRUSR ? mask&AVIO_FLAG_READ : 0;
105 ret |= st.st_mode&S_IWUSR ? mask&AVIO_FLAG_WRITE : 0;
110 #if CONFIG_FILE_PROTOCOL
112 static int file_open(URLContext *h, const char *filename, int flags)
114 FileContext *c = h->priv_data;
119 av_strstart(filename, "file:", &filename);
121 if (flags & AVIO_FLAG_WRITE && flags & AVIO_FLAG_READ) {
122 access = O_CREAT | O_RDWR;
125 } else if (flags & AVIO_FLAG_WRITE) {
126 access = O_CREAT | O_WRONLY;
135 fd = open(filename, access, 0666);
137 return AVERROR(errno);
140 h->is_streamed = !fstat(fd, &st) && S_ISFIFO(st.st_mode);
145 /* XXX: use llseek */
146 static int64_t file_seek(URLContext *h, int64_t pos, int whence)
148 FileContext *c = h->priv_data;
151 if (whence == AVSEEK_SIZE) {
153 ret = fstat(c->fd, &st);
154 return ret < 0 ? AVERROR(errno) : (S_ISFIFO(st.st_mode) ? 0 : st.st_size);
157 ret = lseek(c->fd, pos, whence);
159 return ret < 0 ? AVERROR(errno) : ret;
162 static int file_close(URLContext *h)
164 FileContext *c = h->priv_data;
168 URLProtocol ff_file_protocol = {
170 .url_open = file_open,
171 .url_read = file_read,
172 .url_write = file_write,
173 .url_seek = file_seek,
174 .url_close = file_close,
175 .url_get_file_handle = file_get_handle,
176 .url_check = file_check,
177 .priv_data_size = sizeof(FileContext),
178 .priv_data_class = &file_class,
181 #endif /* CONFIG_FILE_PROTOCOL */
183 #if CONFIG_PIPE_PROTOCOL
185 static int pipe_open(URLContext *h, const char *filename, int flags)
187 FileContext *c = h->priv_data;
190 av_strstart(filename, "pipe:", &filename);
192 fd = strtol(filename, &final, 10);
193 if((filename == final) || *final ) {/* No digits found, or something like 10ab */
194 if (flags & AVIO_FLAG_WRITE) {
201 setmode(fd, O_BINARY);
208 URLProtocol ff_pipe_protocol = {
210 .url_open = pipe_open,
211 .url_read = file_read,
212 .url_write = file_write,
213 .url_get_file_handle = file_get_handle,
214 .url_check = file_check,
215 .priv_data_size = sizeof(FileContext),
218 #endif /* CONFIG_PIPE_PROTOCOL */