2 * copyright (c) 2001 Fabrice Bellard
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #ifndef AVFORMAT_INTERNAL_H
22 #define AVFORMAT_INTERNAL_H
27 #define MAX_URL_SIZE 4096
29 typedef struct AVCodecTag {
34 void ff_dynarray_add(intptr_t **tab_ptr, int *nb_ptr, intptr_t elem);
37 #define dynarray_add(tab, nb_ptr, elem)\
39 __typeof__(tab) _tab = (tab);\
40 __typeof__(elem) _elem = (elem);\
41 (void)sizeof(**_tab == _elem); /* check that types are compatible */\
42 ff_dynarray_add((intptr_t **)_tab, nb_ptr, (intptr_t)_elem);\
45 #define dynarray_add(tab, nb_ptr, elem)\
47 ff_dynarray_add((intptr_t **)(tab), nb_ptr, (intptr_t)(elem));\
51 time_t mktimegm(struct tm *tm);
52 struct tm *brktimegm(time_t secs, struct tm *tm);
53 const char *small_strptime(const char *p, const char *fmt,
56 char *ff_data_to_hex(char *buf, const uint8_t *src, int size, int lowercase);
59 * Parse a string of hexadecimal strings. Any space between the hexadecimal
62 * @param data if non-null, the parsed data is written to this pointer
63 * @param p the string to parse
64 * @return the number of bytes written (or to be written, if data is null)
66 int ff_hex_to_data(uint8_t *data, const char *p);
68 void ff_program_add_stream_index(AVFormatContext *ac, int progid, unsigned int idx);
71 * Add packet to AVFormatContext->packet_buffer list, determining its
72 * interleaved position using compare() function argument.
74 void ff_interleave_add_packet(AVFormatContext *s, AVPacket *pkt,
75 int (*compare)(AVFormatContext *, AVPacket *, AVPacket *));
77 void ff_read_frame_flush(AVFormatContext *s);
79 #define NTP_OFFSET 2208988800ULL
80 #define NTP_OFFSET_US (NTP_OFFSET * 1000000ULL)
82 /** Get the current time since NTP epoch in microseconds. */
83 uint64_t ff_ntp_time(void);
86 * Probe a bytestream to determine the input format. Each time a probe returns
87 * with a score that is too low, the probe buffer size is increased and another
88 * attempt is made. When the maximum probe size is reached, the input format
89 * with the highest score is returned.
91 * @param pb the bytestream to probe, it may be closed and opened again
92 * @param fmt the input format is put here
93 * @param filename the filename of the stream
94 * @param logctx the log context
95 * @param offset the offset within the bytestream to probe from
96 * @param max_probe_size the maximum probe buffer size (zero for default)
97 * @return 0 in case of success, a negative value corresponding to an
98 * AVERROR code otherwise
100 int ff_probe_input_buffer(ByteIOContext **pb, AVInputFormat **fmt,
101 const char *filename, void *logctx,
102 unsigned int offset, unsigned int max_probe_size);
106 * @deprecated use av_url_split() instead
108 void ff_url_split(char *proto, int proto_size,
109 char *authorization, int authorization_size,
110 char *hostname, int hostname_size,
112 char *path, int path_size,
117 * Assemble a URL string from components. This is the reverse operation
120 * Note, this requires networking to be initialized, so the caller must
121 * ensure ff_network_init has been called.
125 * @param str the buffer to fill with the url
126 * @param size the size of the str buffer
127 * @param proto the protocol identifier, if null, the separator
128 * after the identifier is left out, too
129 * @param authorization an optional authorization string, may be null.
130 * An empty string is treated the same as a null string.
131 * @param hostname the host name string
132 * @param port the port number, left out from the string if negative
133 * @param fmt a generic format string for everything to add after the
134 * host/port, may be null
135 * @return the number of characters written to the destination buffer
137 int ff_url_join(char *str, int size, const char *proto,
138 const char *authorization, const char *hostname,
139 int port, const char *fmt, ...);
142 * Append the media-specific SDP fragment for the media stream c
143 * to the buffer buff.
145 * Note, the buffer needs to be initialized, since it is appended to
148 * @param buff the buffer to append the SDP fragment to
149 * @param size the size of the buff buffer
150 * @param c the AVCodecContext of the media to describe
151 * @param dest_addr the destination address of the media stream, may be NULL
152 * @param dest_type the destination address type, may be NULL
153 * @param port the destination port of the media stream, 0 if unknown
154 * @param ttl the time to live of the stream, 0 if not multicast
156 void ff_sdp_write_media(char *buff, int size, AVCodecContext *c,
157 const char *dest_addr, const char *dest_type,
161 * Write a packet to another muxer than the one the user originally
162 * intended. Useful when chaining muxers, where one muxer internally
163 * writes a received packet to another muxer.
165 * @param dst the muxer to write the packet to
166 * @param dst_stream the stream index within dst to write the packet to
167 * @param pkt the packet to be written
168 * @param src the muxer the packet originally was intended for
169 * @return the value av_write_frame returned
171 int ff_write_chained(AVFormatContext *dst, int dst_stream, AVPacket *pkt,
172 AVFormatContext *src);
175 * Get the length in bytes which is needed to store val as v.
177 int ff_get_v_length(uint64_t val);
180 * Put val using a variable number of bytes.
182 void ff_put_v(ByteIOContext *bc, uint64_t val);
185 * Read a whole line of text from ByteIOContext. Stop reading after reaching
186 * either a \n, a \0 or EOF. The returned string is always \0 terminated,
187 * and may be truncated if the buffer is too small.
189 * @param s the read-only ByteIOContext
190 * @param buf buffer to store the read line
191 * @param maxlen size of the buffer
192 * @return the length of the string written in the buffer, not including the
195 int ff_get_line(ByteIOContext *s, char *buf, int maxlen);
197 #define SPACE_CHARS " \t\r\n"
200 * Callback function type for ff_parse_key_value.
202 * @param key a pointer to the key
203 * @param key_len the number of bytes that belong to the key, including the '='
205 * @param dest return the destination pointer for the value in *dest, may
206 * be null to ignore the value
207 * @param dest_len the length of the *dest buffer
209 typedef void (*ff_parse_key_val_cb)(void *context, const char *key,
210 int key_len, char **dest, int *dest_len);
212 * Parse a string with comma-separated key=value pairs. The value strings
213 * may be quoted and may contain escaped characters within quoted strings.
215 * @param str the string to parse
216 * @param callback_get_buf function that returns where to store the
217 * unescaped value string.
218 * @param context the opaque context pointer to pass to callback_get_buf
220 void ff_parse_key_value(const char *str, ff_parse_key_val_cb callback_get_buf,
224 * Find stream index based on format-specific stream ID
225 * @return stream index, or < 0 on error
227 int ff_find_stream_index(AVFormatContext *s, int id);
229 #endif /* AVFORMAT_INTERNAL_H */