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/*
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 * copyright (c) 2001 Fabrice Bellard
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 *
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * Libav is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with Libav; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#ifndef AVFORMAT_INTERNAL_H
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#define AVFORMAT_INTERNAL_H
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#include <stdint.h>
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#include "avformat.h"
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#define MAX_URL_SIZE 4096
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typedef struct AVCodecTag {
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    enum CodecID id;
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    unsigned int tag;
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} AVCodecTag;
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void ff_dynarray_add(intptr_t **tab_ptr, int *nb_ptr, intptr_t elem);
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#ifdef __GNUC__
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#define dynarray_add(tab, nb_ptr, elem)\
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do {\
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    __typeof__(tab) _tab = (tab);\
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    __typeof__(elem) _elem = (elem);\
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    (void)sizeof(**_tab == _elem); /* check that types are compatible */\
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    ff_dynarray_add((intptr_t **)_tab, nb_ptr, (intptr_t)_elem);\
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} while(0)
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#else
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#define dynarray_add(tab, nb_ptr, elem)\
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do {\
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    ff_dynarray_add((intptr_t **)(tab), nb_ptr, (intptr_t)(elem));\
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} while(0)
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#endif
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struct tm *brktimegm(time_t secs, struct tm *tm);
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char *ff_data_to_hex(char *buf, const uint8_t *src, int size, int lowercase);
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/**
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 * Parse a string of hexadecimal strings. Any space between the hexadecimal
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 * digits is ignored.
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 *
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 * @param data if non-null, the parsed data is written to this pointer
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 * @param p the string to parse
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 * @return the number of bytes written (or to be written, if data is null)
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 */
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int ff_hex_to_data(uint8_t *data, const char *p);
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void ff_program_add_stream_index(AVFormatContext *ac, int progid, unsigned int idx);
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/**
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 * Add packet to AVFormatContext->packet_buffer list, determining its
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 * interleaved position using compare() function argument.
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 */
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void ff_interleave_add_packet(AVFormatContext *s, AVPacket *pkt,
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                              int (*compare)(AVFormatContext *, AVPacket *, AVPacket *));
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void ff_read_frame_flush(AVFormatContext *s);
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#define NTP_OFFSET 2208988800ULL
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#define NTP_OFFSET_US (NTP_OFFSET * 1000000ULL)
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/** Get the current time since NTP epoch in microseconds. */
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uint64_t ff_ntp_time(void);
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#if FF_API_URL_SPLIT
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/**
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 * @deprecated use av_url_split() instead
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 */
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void ff_url_split(char *proto, int proto_size,
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                  char *authorization, int authorization_size,
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                  char *hostname, int hostname_size,
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                  int *port_ptr,
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                  char *path, int path_size,
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                  const char *url);
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#endif
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/**
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 * Assemble a URL string from components. This is the reverse operation
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 * of av_url_split.
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 *
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 * Note, this requires networking to be initialized, so the caller must
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 * ensure ff_network_init has been called.
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 *
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 * @see av_url_split
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 *
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 * @param str the buffer to fill with the url
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 * @param size the size of the str buffer
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 * @param proto the protocol identifier, if null, the separator
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 *              after the identifier is left out, too
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 * @param authorization an optional authorization string, may be null.
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 *                      An empty string is treated the same as a null string.
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 * @param hostname the host name string
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 * @param port the port number, left out from the string if negative
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 * @param fmt a generic format string for everything to add after the
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 *            host/port, may be null
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 * @return the number of characters written to the destination buffer
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 */
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int ff_url_join(char *str, int size, const char *proto,
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                const char *authorization, const char *hostname,
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                int port, const char *fmt, ...);
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/**
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 * Append the media-specific SDP fragment for the media stream c
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 * to the buffer buff.
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 *
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 * Note, the buffer needs to be initialized, since it is appended to
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 * existing content.
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 *
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 * @param buff the buffer to append the SDP fragment to
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 * @param size the size of the buff buffer
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 * @param c the AVCodecContext of the media to describe
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 * @param dest_addr the destination address of the media stream, may be NULL
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 * @param dest_type the destination address type, may be NULL
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 * @param port the destination port of the media stream, 0 if unknown
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 * @param ttl the time to live of the stream, 0 if not multicast
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 */
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void ff_sdp_write_media(char *buff, int size, AVCodecContext *c,
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                        const char *dest_addr, const char *dest_type,
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                        int port, int ttl);
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/**
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 * Write a packet to another muxer than the one the user originally
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 * intended. Useful when chaining muxers, where one muxer internally
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 * writes a received packet to another muxer.
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 *
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 * @param dst the muxer to write the packet to
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 * @param dst_stream the stream index within dst to write the packet to
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 * @param pkt the packet to be written
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 * @param src the muxer the packet originally was intended for
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 * @return the value av_write_frame returned
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 */
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int ff_write_chained(AVFormatContext *dst, int dst_stream, AVPacket *pkt,
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                     AVFormatContext *src);
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/**
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 * Get the length in bytes which is needed to store val as v.
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 */
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int ff_get_v_length(uint64_t val);
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/**
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 * Put val using a variable number of bytes.
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 */
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void ff_put_v(AVIOContext *bc, uint64_t val);
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/**
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 * Read a whole line of text from AVIOContext. Stop reading after reaching
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 * either a \n, a \0 or EOF. The returned string is always \0 terminated,
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 * and may be truncated if the buffer is too small.
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 *
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 * @param s the read-only AVIOContext
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 * @param buf buffer to store the read line
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 * @param maxlen size of the buffer
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 * @return the length of the string written in the buffer, not including the
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 *         final \0
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 */
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int ff_get_line(AVIOContext *s, char *buf, int maxlen);
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#define SPACE_CHARS " \t\r\n"
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/**
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 * Callback function type for ff_parse_key_value.
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 *
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 * @param key a pointer to the key
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 * @param key_len the number of bytes that belong to the key, including the '='
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 *                char
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 * @param dest return the destination pointer for the value in *dest, may
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 *             be null to ignore the value
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 * @param dest_len the length of the *dest buffer
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 */
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typedef void (*ff_parse_key_val_cb)(void *context, const char *key,
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                                    int key_len, char **dest, int *dest_len);
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/**
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 * Parse a string with comma-separated key=value pairs. The value strings
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 * may be quoted and may contain escaped characters within quoted strings.
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 *
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 * @param str the string to parse
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 * @param callback_get_buf function that returns where to store the
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 *                         unescaped value string.
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 * @param context the opaque context pointer to pass to callback_get_buf
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 */
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void ff_parse_key_value(const char *str, ff_parse_key_val_cb callback_get_buf,
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                        void *context);
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/**
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 * Find stream index based on format-specific stream ID
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 * @return stream index, or < 0 on error
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 */
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int ff_find_stream_index(AVFormatContext *s, int id);
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/**
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 * Internal version of av_index_search_timestamp
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 */
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int ff_index_search_timestamp(const AVIndexEntry *entries, int nb_entries,
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                              int64_t wanted_timestamp, int flags);
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/**
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 * Internal version of av_add_index_entry
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 */
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int ff_add_index_entry(AVIndexEntry **index_entries,
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                       int *nb_index_entries,
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                       unsigned int *index_entries_allocated_size,
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                       int64_t pos, int64_t timestamp, int size, int distance, int flags);
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/**
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 * Add a new chapter.
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 *
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 * @param s media file handle
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 * @param id unique ID for this chapter
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 * @param start chapter start time in time_base units
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 * @param end chapter end time in time_base units
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 * @param title chapter title
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 *
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 * @return AVChapter or NULL on error
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 */
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AVChapter *ff_new_chapter(AVFormatContext *s, int id, AVRational time_base,
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                          int64_t start, int64_t end, const char *title);
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/**
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 * Ensure the index uses less memory than the maximum specified in
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 * AVFormatContext.max_index_size by discarding entries if it grows
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 * too large.
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 */
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void ff_reduce_index(AVFormatContext *s, int stream_index);
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/*
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 * Convert a relative url into an absolute url, given a base url.
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 *
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 * @param buf the buffer where output absolute url is written
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 * @param size the size of buf
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 * @param base the base url, may be equal to buf.
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 * @param rel the new url, which is interpreted relative to base
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 */
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void ff_make_absolute_url(char *buf, int size, const char *base,
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                          const char *rel);
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#endif /* AVFORMAT_INTERNAL_H */