3 * This file is part of FFmpeg.
5 * FFmpeg is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2.1 of the License, or (at your option) any later version.
10 * FFmpeg is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with FFmpeg; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 * unbuffered private I/O API
25 #ifndef AVFORMAT_URL_H
26 #define AVFORMAT_URL_H
29 #include "libavformat/version.h"
32 #define URL_PROTOCOL_FLAG_NESTED_SCHEME 1 /*< The protocol name can be the first part of a nested protocol scheme */
34 extern int (*url_interrupt_cb)(void);
36 typedef struct URLContext {
37 const AVClass *av_class; /**< information for av_log(). Set by url_open(). */
38 struct URLProtocol *prot;
40 char *filename; /**< specified URL */
42 int max_packet_size; /**< if non zero, the stream is packetized with this max packet size */
43 int is_streamed; /**< true if streamed (no seek possible), default = false */
47 typedef struct URLProtocol {
49 int (*url_open)( URLContext *h, const char *url, int flags);
50 int (*url_read)( URLContext *h, unsigned char *buf, int size);
51 int (*url_write)(URLContext *h, const unsigned char *buf, int size);
52 int64_t (*url_seek)( URLContext *h, int64_t pos, int whence);
53 int (*url_close)(URLContext *h);
54 struct URLProtocol *next;
55 int (*url_read_pause)(URLContext *h, int pause);
56 int64_t (*url_read_seek)(URLContext *h, int stream_index,
57 int64_t timestamp, int flags);
58 int (*url_get_file_handle)(URLContext *h);
60 const AVClass *priv_data_class;
66 * Create a URLContext for accessing to the resource indicated by
67 * url, but do not initiate the connection yet.
69 * @param puc pointer to the location where, in case of success, the
70 * function puts the pointer to the created URLContext
71 * @param flags flags which control how the resource indicated by url
73 * @return 0 in case of success, a negative value corresponding to an
74 * AVERROR code in case of failure
76 int ffurl_alloc(URLContext **h, const char *url, int flags);
79 * Connect an URLContext that has been allocated by ffurl_alloc
81 int ffurl_connect(URLContext *h);
84 * Create an URLContext for accessing to the resource indicated by
87 * @param puc pointer to the location where, in case of success, the
88 * function puts the pointer to the created URLContext
89 * @param flags flags which control how the resource indicated by url
91 * @return 0 in case of success, a negative value corresponding to an
92 * AVERROR code in case of failure
94 int ffurl_open(URLContext **h, const char *url, int flags);
97 * Read up to size bytes from the resource accessed by h, and store
98 * the read bytes in buf.
100 * @return The number of bytes actually read, or a negative value
101 * corresponding to an AVERROR code in case of error. A value of zero
102 * indicates that it is not possible to read more from the accessed
103 * resource (except if the value of the size argument is also zero).
105 int ffurl_read(URLContext *h, unsigned char *buf, int size);
108 * Read as many bytes as possible (up to size), calling the
109 * read function multiple times if necessary.
110 * This makes special short-read handling in applications
111 * unnecessary, if the return value is < size then it is
112 * certain there was either an error or the end of file was reached.
114 int ffurl_read_complete(URLContext *h, unsigned char *buf, int size);
117 * Write size bytes from buf to the resource accessed by h.
119 * @return the number of bytes actually written, or a negative value
120 * corresponding to an AVERROR code in case of failure
122 int ffurl_write(URLContext *h, const unsigned char *buf, int size);
125 * Change the position that will be used by the next read/write
126 * operation on the resource accessed by h.
128 * @param pos specifies the new position to set
129 * @param whence specifies how pos should be interpreted, it must be
130 * one of SEEK_SET (seek from the beginning), SEEK_CUR (seek from the
131 * current position), SEEK_END (seek from the end), or AVSEEK_SIZE
132 * (return the filesize of the requested resource, pos is ignored).
133 * @return a negative value corresponding to an AVERROR code in case
134 * of failure, or the resulting file position, measured in bytes from
135 * the beginning of the file. You can use this feature together with
136 * SEEK_CUR to read the current file position.
138 int64_t ffurl_seek(URLContext *h, int64_t pos, int whence);
141 * Close the resource accessed by the URLContext h, and free the
144 * @return a negative value if an error condition occurred, 0
147 int ffurl_close(URLContext *h);
150 * Return the filesize of the resource accessed by h, AVERROR(ENOSYS)
151 * if the operation is not supported by h, or another negative value
152 * corresponding to an AVERROR error code in case of failure.
154 int64_t ffurl_size(URLContext *h);
157 * Return the file descriptor associated with this URL. For RTP, this
158 * will return only the RTP file descriptor, not the RTCP file descriptor.
160 * @return the file descriptor associated with this URL, or <0 on error.
162 int ffurl_get_file_handle(URLContext *h);
165 * Register the URLProtocol protocol.
167 * @param size the size of the URLProtocol struct referenced
169 int ffurl_register_protocol(URLProtocol *protocol, int size);
172 int ff_udp_set_remote_url(URLContext *h, const char *uri);
173 int ff_udp_get_local_port(URLContext *h);
175 #endif //AVFORMAT_URL_H