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 {
35 #define dynarray_add(tab, nb_ptr, elem)\
37 __typeof__(tab) _tab = (tab);\
38 __typeof__(elem) _elem = (elem);\
39 (void)sizeof(**_tab == _elem); /* check that types are compatible */\
40 av_dynarray_add(_tab, nb_ptr, _elem);\
43 #define dynarray_add(tab, nb_ptr, elem)\
45 av_dynarray_add((tab), nb_ptr, (elem));\
49 struct tm *brktimegm(time_t secs, struct tm *tm);
51 char *ff_data_to_hex(char *buf, const uint8_t *src, int size, int lowercase);
54 * Parse a string of hexadecimal strings. Any space between the hexadecimal
57 * @param data if non-null, the parsed data is written to this pointer
58 * @param p the string to parse
59 * @return the number of bytes written (or to be written, if data is null)
61 int ff_hex_to_data(uint8_t *data, const char *p);
63 void ff_program_add_stream_index(AVFormatContext *ac, int progid, unsigned int idx);
66 * Add packet to AVFormatContext->packet_buffer list, determining its
67 * interleaved position using compare() function argument.
69 void ff_interleave_add_packet(AVFormatContext *s, AVPacket *pkt,
70 int (*compare)(AVFormatContext *, AVPacket *, AVPacket *));
72 void ff_read_frame_flush(AVFormatContext *s);
74 #define NTP_OFFSET 2208988800ULL
75 #define NTP_OFFSET_US (NTP_OFFSET * 1000000ULL)
77 /** Get the current time since NTP epoch in microseconds. */
78 uint64_t ff_ntp_time(void);
81 * Assemble a URL string from components. This is the reverse operation
84 * Note, this requires networking to be initialized, so the caller must
85 * ensure ff_network_init has been called.
89 * @param str the buffer to fill with the url
90 * @param size the size of the str buffer
91 * @param proto the protocol identifier, if null, the separator
92 * after the identifier is left out, too
93 * @param authorization an optional authorization string, may be null.
94 * An empty string is treated the same as a null string.
95 * @param hostname the host name string
96 * @param port the port number, left out from the string if negative
97 * @param fmt a generic format string for everything to add after the
98 * host/port, may be null
99 * @return the number of characters written to the destination buffer
101 int ff_url_join(char *str, int size, const char *proto,
102 const char *authorization, const char *hostname,
103 int port, const char *fmt, ...);
106 * Append the media-specific SDP fragment for the media stream c
107 * to the buffer buff.
109 * Note, the buffer needs to be initialized, since it is appended to
112 * @param buff the buffer to append the SDP fragment to
113 * @param size the size of the buff buffer
114 * @param c the AVCodecContext of the media to describe
115 * @param dest_addr the destination address of the media stream, may be NULL
116 * @param dest_type the destination address type, may be NULL
117 * @param port the destination port of the media stream, 0 if unknown
118 * @param ttl the time to live of the stream, 0 if not multicast
120 void ff_sdp_write_media(char *buff, int size, AVCodecContext *c,
121 const char *dest_addr, const char *dest_type,
125 * Write a packet to another muxer than the one the user originally
126 * intended. Useful when chaining muxers, where one muxer internally
127 * writes a received packet to another muxer.
129 * @param dst the muxer to write the packet to
130 * @param dst_stream the stream index within dst to write the packet to
131 * @param pkt the packet to be written
132 * @param src the muxer the packet originally was intended for
133 * @return the value av_write_frame returned
135 int ff_write_chained(AVFormatContext *dst, int dst_stream, AVPacket *pkt,
136 AVFormatContext *src);
139 * Get the length in bytes which is needed to store val as v.
141 int ff_get_v_length(uint64_t val);
144 * Put val using a variable number of bytes.
146 void ff_put_v(AVIOContext *bc, uint64_t val);
149 * Read a whole line of text from AVIOContext. Stop reading after reaching
150 * either a \n, a \0 or EOF. The returned string is always \0 terminated,
151 * and may be truncated if the buffer is too small.
153 * @param s the read-only AVIOContext
154 * @param buf buffer to store the read line
155 * @param maxlen size of the buffer
156 * @return the length of the string written in the buffer, not including the
159 int ff_get_line(AVIOContext *s, char *buf, int maxlen);
161 #define SPACE_CHARS " \t\r\n"
164 * Callback function type for ff_parse_key_value.
166 * @param key a pointer to the key
167 * @param key_len the number of bytes that belong to the key, including the '='
169 * @param dest return the destination pointer for the value in *dest, may
170 * be null to ignore the value
171 * @param dest_len the length of the *dest buffer
173 typedef void (*ff_parse_key_val_cb)(void *context, const char *key,
174 int key_len, char **dest, int *dest_len);
176 * Parse a string with comma-separated key=value pairs. The value strings
177 * may be quoted and may contain escaped characters within quoted strings.
179 * @param str the string to parse
180 * @param callback_get_buf function that returns where to store the
181 * unescaped value string.
182 * @param context the opaque context pointer to pass to callback_get_buf
184 void ff_parse_key_value(const char *str, ff_parse_key_val_cb callback_get_buf,
188 * Find stream index based on format-specific stream ID
189 * @return stream index, or < 0 on error
191 int ff_find_stream_index(AVFormatContext *s, int id);
194 * Internal version of av_index_search_timestamp
196 int ff_index_search_timestamp(const AVIndexEntry *entries, int nb_entries,
197 int64_t wanted_timestamp, int flags);
200 * Internal version of av_add_index_entry
202 int ff_add_index_entry(AVIndexEntry **index_entries,
203 int *nb_index_entries,
204 unsigned int *index_entries_allocated_size,
205 int64_t pos, int64_t timestamp, int size, int distance, int flags);
210 * @param s media file handle
211 * @param id unique ID for this chapter
212 * @param start chapter start time in time_base units
213 * @param end chapter end time in time_base units
214 * @param title chapter title
216 * @return AVChapter or NULL on error
218 AVChapter *ff_new_chapter(AVFormatContext *s, int id, AVRational time_base,
219 int64_t start, int64_t end, const char *title);
222 * Ensure the index uses less memory than the maximum specified in
223 * AVFormatContext.max_index_size by discarding entries if it grows
226 void ff_reduce_index(AVFormatContext *s, int stream_index);
229 * Convert a relative url into an absolute url, given a base url.
231 * @param buf the buffer where output absolute url is written
232 * @param size the size of buf
233 * @param base the base url, may be equal to buf.
234 * @param rel the new url, which is interpreted relative to base
236 void ff_make_absolute_url(char *buf, int size, const char *base,
239 enum CodecID ff_guess_image2_codec(const char *filename);
241 #endif /* AVFORMAT_INTERNAL_H */