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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 FFmpeg.
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 *
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 * FFmpeg 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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 * FFmpeg 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 FFmpeg; 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_AVFORMAT_H
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#define AVFORMAT_AVFORMAT_H
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#define LIBAVFORMAT_VERSION_MAJOR 52
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#define LIBAVFORMAT_VERSION_MINOR 32
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#define LIBAVFORMAT_VERSION_MICRO  0
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#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
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                                               LIBAVFORMAT_VERSION_MINOR, \
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                                               LIBAVFORMAT_VERSION_MICRO)
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#define LIBAVFORMAT_VERSION     AV_VERSION(LIBAVFORMAT_VERSION_MAJOR,   \
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                                           LIBAVFORMAT_VERSION_MINOR,   \
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                                           LIBAVFORMAT_VERSION_MICRO)
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#define LIBAVFORMAT_BUILD       LIBAVFORMAT_VERSION_INT
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#define LIBAVFORMAT_IDENT       "Lavf" AV_STRINGIFY(LIBAVFORMAT_VERSION)
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/**
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 * Returns the LIBAVFORMAT_VERSION_INT constant.
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 */
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unsigned avformat_version(void);
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#include <time.h>
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#include <stdio.h>  /* FILE */
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#include "libavcodec/avcodec.h"
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#include "avio.h"
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struct AVFormatContext;
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/*
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 * Public Metadata API.
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 * The metadata API allows libavformat to export metadata tags to a client
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 * application using a sequence of key/value pairs.
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 * Important concepts to keep in mind:
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 * 1. Keys are unique; there can never be 2 tags with the same key. This is
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 *    also meant semantically, i.e., a demuxer should not knowingly produce
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 *    several keys that are literally different but semantically identical.
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 *    E.g., key=Author5, key=Author6. In this example, all authors must be
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 *    placed in the same tag.
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 * 2. Metadata is flat, not hierarchical; there are no subtags. If you
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 *    want to store, e.g., the email address of the child of producer Alice
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 *    and actor Bob, that could have key=alice_and_bobs_childs_email_address.
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 * 3. A tag whose value is localized for a particular language is appended
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 *    with a dash character ('-') and the ISO 639 3-letter language code.
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 *    For example: Author-ger=Michael, Author-eng=Mike
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 *    The original/default language is in the unqualified "Author" tag.
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 *    A demuxer should set a default if it sets any translated tag.
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 */
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#define AV_METADATA_MATCH_CASE      1
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#define AV_METADATA_IGNORE_SUFFIX   2
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typedef struct {
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    char *key;
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    char *value;
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}AVMetadataTag;
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typedef struct AVMetadata AVMetadata;
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typedef struct AVMetadataConv AVMetadataConv;
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/**
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 * Gets a metadata element with matching key.
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 * @param prev Set to the previous matching element to find the next.
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 * @param flags Allows case as well as suffix-insensitive comparisons.
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 * @return Found tag or NULL, changing key or value leads to undefined behavior.
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 */
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AVMetadataTag *
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av_metadata_get(AVMetadata *m, const char *key, const AVMetadataTag *prev, int flags);
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/**
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 * Sets the given tag in m, overwriting an existing tag.
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 * @param key tag key to add to m (will be av_strduped)
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 * @param value tag value to add to m (will be av_strduped)
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 * @return >= 0 on success otherwise an error code <0
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 */
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int av_metadata_set(AVMetadata **pm, const char *key, const char *value);
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/**
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 * Convert all the metadata sets from ctx according to the source and
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 * destination conversion tables.
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 * @param d_conv destination tags format conversion table
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 * @param s_conv source tags format conversion table
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 */
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void av_metadata_conv(struct AVFormatContext *ctx,const AVMetadataConv *d_conv,
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                                                  const AVMetadataConv *s_conv);
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/**
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 * Frees all the memory allocated for an AVMetadata struct.
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 */
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void av_metadata_free(AVMetadata **m);
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/* packet functions */
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typedef struct AVPacket {
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    /**
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     * Presentation timestamp in time_base units; the time at which the
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     * decompressed packet will be presented to the user.
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     * Can be AV_NOPTS_VALUE if it is not stored in the file.
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     * pts MUST be larger or equal to dts as presentation cannot happen before
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     * decompression, unless one wants to view hex dumps. Some formats misuse
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     * the terms dts and pts/cts to mean something different. Such timestamps
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     * must be converted to true pts/dts before they are stored in AVPacket.
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     */
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    int64_t pts;
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    /**
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     * Decompression timestamp in time_base units; the time at which the
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     * packet is decompressed.
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     * Can be AV_NOPTS_VALUE if it is not stored in the file.
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     */
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    int64_t dts;
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    uint8_t *data;
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    int   size;
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    int   stream_index;
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    int   flags;
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    /**
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     * Duration of this packet in time_base units, 0 if unknown.
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     * Equals next_pts - this_pts in presentation order.
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     */
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    int   duration;
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    void  (*destruct)(struct AVPacket *);
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    void  *priv;
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    int64_t pos;                            ///< byte position in stream, -1 if unknown
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    /**
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     * Time difference in stream time base units from the pts of this
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     * packet to the point at which the output from the decoder has converged
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     * independent from the availability of previous frames. That is, the
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     * frames are virtually identical no matter if decoding started from
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     * the very first frame or from this keyframe.
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     * Is AV_NOPTS_VALUE if unknown.
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     * This field is not the display duration of the current packet.
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     *
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     * The purpose of this field is to allow seeking in streams that have no
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     * keyframes in the conventional sense. It corresponds to the
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     * recovery point SEI in H.264 and match_time_delta in NUT. It is also
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     * essential for some types of subtitle streams to ensure that all
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     * subtitles are correctly displayed after seeking.
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     */
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    int64_t convergence_duration;
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} AVPacket;
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#define PKT_FLAG_KEY   0x0001
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void av_destruct_packet_nofree(AVPacket *pkt);
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/**
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 * Default packet destructor.
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 */
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void av_destruct_packet(AVPacket *pkt);
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/**
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 * Initialize optional fields of a packet with default values.
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 *
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 * @param pkt packet
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 */
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void av_init_packet(AVPacket *pkt);
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/**
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 * Allocate the payload of a packet and initialize its fields with
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 * default values.
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 *
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 * @param pkt packet
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 * @param size wanted payload size
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 * @return 0 if OK, AVERROR_xxx otherwise
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 */
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int av_new_packet(AVPacket *pkt, int size);
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/**
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 * Allocate and read the payload of a packet and initialize its fields with
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 * default values.
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 *
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 * @param pkt packet
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 * @param size desired payload size
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 * @return >0 (read size) if OK, AVERROR_xxx otherwise
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 */
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int av_get_packet(ByteIOContext *s, AVPacket *pkt, int size);
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/**
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 * @warning This is a hack - the packet memory allocation stuff is broken. The
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 * packet is allocated if it was not really allocated.
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 */
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int av_dup_packet(AVPacket *pkt);
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/**
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 * Free a packet.
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 *
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 * @param pkt packet to free
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 */
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static inline void av_free_packet(AVPacket *pkt)
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{
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    if (pkt && pkt->destruct) {
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        pkt->destruct(pkt);
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    }
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}
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/*************************************************/
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/* fractional numbers for exact pts handling */
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/**
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 * The exact value of the fractional number is: 'val + num / den'.
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 * num is assumed to be 0 <= num < den.
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 */
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typedef struct AVFrac {
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    int64_t val, num, den;
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} AVFrac;
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/*************************************************/
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/* input/output formats */
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struct AVCodecTag;
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/** This structure contains the data a format has to probe a file. */
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typedef struct AVProbeData {
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    const char *filename;
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    unsigned char *buf;
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    int buf_size;
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} AVProbeData;
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#define AVPROBE_SCORE_MAX 100               ///< maximum score, half of that is used for file-extension-based detection
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#define AVPROBE_PADDING_SIZE 32             ///< extra allocated bytes at the end of the probe buffer
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typedef struct AVFormatParameters {
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    AVRational time_base;
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    int sample_rate;
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    int channels;
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    int width;
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    int height;
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    enum PixelFormat pix_fmt;
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    int channel; /**< Used to select DV channel. */
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    const char *standard; /**< TV standard, NTSC, PAL, SECAM */
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    unsigned int mpeg2ts_raw:1;  /**< Force raw MPEG-2 transport stream output, if possible. */
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    unsigned int mpeg2ts_compute_pcr:1; /**< Compute exact PCR for each transport
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                                            stream packet (only meaningful if
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                                            mpeg2ts_raw is TRUE). */
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    unsigned int initial_pause:1;       /**< Do not begin to play the stream
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                                            immediately (RTSP only). */
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    unsigned int prealloced_context:1;
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#if LIBAVFORMAT_VERSION_INT < (53<<16)
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    enum CodecID video_codec_id;
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    enum CodecID audio_codec_id;
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#endif
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} AVFormatParameters;
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//! Demuxer will use url_fopen, no opened file should be provided by the caller.
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#define AVFMT_NOFILE        0x0001
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#define AVFMT_NEEDNUMBER    0x0002 /**< Needs '%d' in filename. */
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#define AVFMT_SHOW_IDS      0x0008 /**< Show format stream IDs numbers. */
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#define AVFMT_RAWPICTURE    0x0020 /**< Format wants AVPicture structure for
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                                      raw picture data. */
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#define AVFMT_GLOBALHEADER  0x0040 /**< Format wants global header. */
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#define AVFMT_NOTIMESTAMPS  0x0080 /**< Format does not need / have any timestamps. */
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#define AVFMT_GENERIC_INDEX 0x0100 /**< Use generic index building code. */
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#define AVFMT_TS_DISCONT    0x0200 /**< Format allows timestamp discontinuities. */
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#define AVFMT_VARIABLE_FPS  0x0400 /**< Format allows variable fps. */
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typedef struct AVOutputFormat {
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    const char *name;
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    /**
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     * Descriptive name for the format, meant to be more human-readable
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     * than \p name. You \e should use the NULL_IF_CONFIG_SMALL() macro
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     * to define it.
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     */
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    const char *long_name;
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    const char *mime_type;
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    const char *extensions; /**< comma-separated filename extensions */
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    /** size of private data so that it can be allocated in the wrapper */
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    int priv_data_size;
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    /* output support */
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    enum CodecID audio_codec; /**< default audio codec */
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    enum CodecID video_codec; /**< default video codec */
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    int (*write_header)(struct AVFormatContext *);
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    int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
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    int (*write_trailer)(struct AVFormatContext *);
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    /** can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_GLOBALHEADER */
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    int flags;
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    /** Currently only used to set pixel format if not YUV420P. */
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    int (*set_parameters)(struct AVFormatContext *, AVFormatParameters *);
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    int (*interleave_packet)(struct AVFormatContext *, AVPacket *out,
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                             AVPacket *in, int flush);
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    /**
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     * List of supported codec_id-codec_tag pairs, ordered by "better
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     * choice first". The arrays are all terminated by CODEC_ID_NONE.
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     */
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    const struct AVCodecTag * const *codec_tag;
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    enum CodecID subtitle_codec; /**< default subtitle codec */
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    const AVMetadataConv *metadata_conv;
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    /* private fields */
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    struct AVOutputFormat *next;
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} AVOutputFormat;
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typedef struct AVInputFormat {
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    const char *name;
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    /**
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     * Descriptive name for the format, meant to be more human-readable
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     * than \p name. You \e should use the NULL_IF_CONFIG_SMALL() macro
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     * to define it.
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     */
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    const char *long_name;
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    /** Size of private data so that it can be allocated in the wrapper. */
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    int priv_data_size;
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    /**
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     * Tell if a given file has a chance of being parsed as this format.
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     * The buffer provided is guaranteed to be AVPROBE_PADDING_SIZE bytes
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     * big so you do not have to check for that unless you need more.
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     */
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    int (*read_probe)(AVProbeData *);
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    /** Read the format header and initialize the AVFormatContext
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       structure. Return 0 if OK. 'ap' if non-NULL contains
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       additional parameters. Only used in raw format right
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       now. 'av_new_stream' should be called to create new streams.  */
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    int (*read_header)(struct AVFormatContext *,
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                       AVFormatParameters *ap);
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    /** Read one packet and put it in 'pkt'. pts and flags are also
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       set. 'av_new_stream' can be called only if the flag
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       AVFMTCTX_NOHEADER is used. */
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    int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
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    /** Close the stream. The AVFormatContext and AVStreams are not
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       freed by this function */
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    int (*read_close)(struct AVFormatContext *);
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#if LIBAVFORMAT_VERSION_MAJOR < 53
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    /**
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     * Seek to a given timestamp relative to the frames in
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     * stream component stream_index.
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     * @param stream_index Must not be -1.
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     * @param flags Selects which direction should be preferred if no exact
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     *              match is available.
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     * @return >= 0 on success (but not necessarily the new offset)
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     */
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    int (*read_seek)(struct AVFormatContext *,
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                     int stream_index, int64_t timestamp, int flags);
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#endif
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    /**
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     * Gets the next timestamp in stream[stream_index].time_base units.
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     * @return the timestamp or AV_NOPTS_VALUE if an error occurred
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     */
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    int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
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                              int64_t *pos, int64_t pos_limit);
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    /** Can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER. */
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    int flags;
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    /** If extensions are defined, then no probe is done. You should
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       usually not use extension format guessing because it is not
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       reliable enough */
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    const char *extensions;
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    /** General purpose read-only value that the format can use. */
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    int value;
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    /** Start/resume playing - only meaningful if using a network-based format
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       (RTSP). */
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    int (*read_play)(struct AVFormatContext *);
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    /** Pause playing - only meaningful if using a network-based format
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       (RTSP). */
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    int (*read_pause)(struct AVFormatContext *);
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    const struct AVCodecTag * const *codec_tag;
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    /**
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     * Seek to timestamp ts.
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     * Seeking will be done so that the point from which all active streams
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     * can be presented successfully will be closest to ts and within min/max_ts.
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     * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
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     */
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    int (*read_seek2)(struct AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
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    const AVMetadataConv *metadata_conv;
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    /* private fields */
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    struct AVInputFormat *next;
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} AVInputFormat;
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enum AVStreamParseType {
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    AVSTREAM_PARSE_NONE,
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    AVSTREAM_PARSE_FULL,       /**< full parsing and repack */
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    AVSTREAM_PARSE_HEADERS,    /**< Only parse headers, do not repack. */
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    AVSTREAM_PARSE_TIMESTAMPS, /**< full parsing and interpolation of timestamps for frames not starting on a packet boundary */
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};
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typedef struct AVIndexEntry {
406
    int64_t pos;
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    int64_t timestamp;
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#define AVINDEX_KEYFRAME 0x0001
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    int flags:2;
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    int size:30; //Yeah, trying to keep the size of this small to reduce memory requirements (it is 24 vs. 32 bytes due to possible 8-byte alignment).
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    int min_distance;         /**< Minimum distance between this and the previous keyframe, used to avoid unneeded searching. */
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} AVIndexEntry;
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#define AV_DISPOSITION_DEFAULT   0x0001
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#define AV_DISPOSITION_DUB       0x0002
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#define AV_DISPOSITION_ORIGINAL  0x0004
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#define AV_DISPOSITION_COMMENT   0x0008
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#define AV_DISPOSITION_LYRICS    0x0010
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#define AV_DISPOSITION_KARAOKE   0x0020
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/**
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 * Stream structure.
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 * New fields can be added to the end with minor version bumps.
424
 * Removal, reordering and changes to existing fields require a major
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 * version bump.
426
 * sizeof(AVStream) must not be used outside libav*.
427
 */
428
typedef struct AVStream {
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    int index;    /**< stream index in AVFormatContext */
430
    int id;       /**< format-specific stream ID */
431
    AVCodecContext *codec; /**< codec context */
432
    /**
433
     * Real base framerate of the stream.
434
     * This is the lowest framerate with which all timestamps can be
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     * represented accurately (it is the least common multiple of all
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     * framerates in the stream). Note, this value is just a guess!
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     * For example, if the time base is 1/90000 and all frames have either
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     * approximately 3600 or 1800 timer ticks, then r_frame_rate will be 50/1.
439
     */
440
    AVRational r_frame_rate;
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    void *priv_data;
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443
    /* internal data used in av_find_stream_info() */
444
    int64_t first_dts;
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    /** encoding: pts generation when outputting stream */
446
    struct AVFrac pts;
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448
    /**
449
     * This is the fundamental unit of time (in seconds) in terms
450
     * of which frame timestamps are represented. For fixed-fps content,
451
     * time base should be 1/framerate and timestamp increments should be 1.
452
     */
453
    AVRational time_base;
454
    int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
455
    /* ffmpeg.c private use */
456
    int stream_copy; /**< If set, just copy stream. */
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    enum AVDiscard discard; ///< Selects which packets can be discarded at will and do not need to be demuxed.
458
    //FIXME move stuff to a flags field?
459
    /** Quality, as it has been removed from AVCodecContext and put in AVVideoFrame.
460
     * MN: dunno if that is the right place for it */
461
    float quality;
462
    /**
463
     * Decoding: pts of the first frame of the stream, in stream time base.
464
     * Only set this if you are absolutely 100% sure that the value you set
465
     * it to really is the pts of the first frame.
466
     * This may be undefined (AV_NOPTS_VALUE).
467
     * @note The ASF header does NOT contain a correct start_time the ASF
468
     * demuxer must NOT set this.
469
     */
470
    int64_t start_time;
471
    /**
472
     * Decoding: duration of the stream, in stream time base.
473
     * If a source file does not specify a duration, but does specify
474
     * a bitrate, this value will be estimated from bitrate and file size.
475
     */
476
    int64_t duration;
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#if LIBAVFORMAT_VERSION_INT < (53<<16)
479
    char language[4]; /** ISO 639 3-letter language code (empty string if undefined) */
480
#endif
481

    
482
    /* av_read_frame() support */
483
    enum AVStreamParseType need_parsing;
484
    struct AVCodecParserContext *parser;
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486
    int64_t cur_dts;
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    int last_IP_duration;
488
    int64_t last_IP_pts;
489
    /* av_seek_frame() support */
490
    AVIndexEntry *index_entries; /**< Only used if the format does not
491
                                    support seeking natively. */
492
    int nb_index_entries;
493
    unsigned int index_entries_allocated_size;
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495
    int64_t nb_frames;                 ///< number of frames in this stream if known or 0
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497
#if LIBAVFORMAT_VERSION_INT < (53<<16)
498
    int64_t unused[4+1];
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500
    char *filename; /**< source filename of the stream */
501
#endif
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503
    int disposition; /**< AV_DISPOSITION_* bit field */
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505
    AVProbeData probe_data;
506
#define MAX_REORDER_DELAY 16
507
    int64_t pts_buffer[MAX_REORDER_DELAY+1];
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509
    /**
510
     * sample aspect ratio (0 if unknown)
511
     * - encoding: Set by user.
512
     * - decoding: Set by libavformat.
513
     */
514
    AVRational sample_aspect_ratio;
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    AVMetadata *metadata;
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    /* av_read_frame() support */
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    const uint8_t *cur_ptr;
520
    int cur_len;
521
    AVPacket cur_pkt;
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523
    // Timestamp generation support:
524
    /**
525
     * Timestamp corresponding to the last dts sync point.
526
     *
527
     * Initialized when AVCodecParserContext.dts_sync_point >= 0 and
528
     * a DTS is received from the underlying container. Otherwise set to
529
     * AV_NOPTS_VALUE by default.
530
     */
531
    int64_t reference_dts;
532
} AVStream;
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534
#define AV_PROGRAM_RUNNING 1
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536
/**
537
 * New fields can be added to the end with minor version bumps.
538
 * Removal, reordering and changes to existing fields require a major
539
 * version bump.
540
 * sizeof(AVProgram) must not be used outside libav*.
541
 */
542
typedef struct AVProgram {
543
    int            id;
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#if LIBAVFORMAT_VERSION_INT < (53<<16)
545
    char           *provider_name; ///< network name for DVB streams
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    char           *name;          ///< service name for DVB streams
547
#endif
548
    int            flags;
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    enum AVDiscard discard;        ///< selects which program to discard and which to feed to the caller
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    unsigned int   *stream_index;
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    unsigned int   nb_stream_indexes;
552
    AVMetadata *metadata;
553
} AVProgram;
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555
#define AVFMTCTX_NOHEADER      0x0001 /**< signal that no header is present
556
                                         (streams are added dynamically) */
557

    
558
typedef struct AVChapter {
559
    int id;                 ///< unique ID to identify the chapter
560
    AVRational time_base;   ///< time base in which the start/end timestamps are specified
561
    int64_t start, end;     ///< chapter start/end time in time_base units
562
#if LIBAVFORMAT_VERSION_INT < (53<<16)
563
    char *title;            ///< chapter title
564
#endif
565
    AVMetadata *metadata;
566
} AVChapter;
567

    
568
#define MAX_STREAMS 20
569

    
570
/**
571
 * Format I/O context.
572
 * New fields can be added to the end with minor version bumps.
573
 * Removal, reordering and changes to existing fields require a major
574
 * version bump.
575
 * sizeof(AVFormatContext) must not be used outside libav*.
576
 */
577
typedef struct AVFormatContext {
578
    const AVClass *av_class; /**< Set by avformat_alloc_context. */
579
    /* Can only be iformat or oformat, not both at the same time. */
580
    struct AVInputFormat *iformat;
581
    struct AVOutputFormat *oformat;
582
    void *priv_data;
583
    ByteIOContext *pb;
584
    unsigned int nb_streams;
585
    AVStream *streams[MAX_STREAMS];
586
    char filename[1024]; /**< input or output filename */
587
    /* stream info */
588
    int64_t timestamp;
589
#if LIBAVFORMAT_VERSION_INT < (53<<16)
590
    char title[512];
591
    char author[512];
592
    char copyright[512];
593
    char comment[512];
594
    char album[512];
595
    int year;  /**< ID3 year, 0 if none */
596
    int track; /**< track number, 0 if none */
597
    char genre[32]; /**< ID3 genre */
598
#endif
599

    
600
    int ctx_flags; /**< Format-specific flags, see AVFMTCTX_xx */
601
    /* private data for pts handling (do not modify directly). */
602
    /** This buffer is only needed when packets were already buffered but
603
       not decoded, for example to get the codec parameters in MPEG
604
       streams. */
605
    struct AVPacketList *packet_buffer;
606

    
607
    /** Decoding: position of the first frame of the component, in
608
       AV_TIME_BASE fractional seconds. NEVER set this value directly:
609
       It is deduced from the AVStream values.  */
610
    int64_t start_time;
611
    /** Decoding: duration of the stream, in AV_TIME_BASE fractional
612
       seconds. NEVER set this value directly: it is deduced from the
613
       AVStream values.  */
614
    int64_t duration;
615
    /** decoding: total file size, 0 if unknown */
616
    int64_t file_size;
617
    /** Decoding: total stream bitrate in bit/s, 0 if not
618
       available. Never set it directly if the file_size and the
619
       duration are known as FFmpeg can compute it automatically. */
620
    int bit_rate;
621

    
622
    /* av_read_frame() support */
623
    AVStream *cur_st;
624
#if LIBAVFORMAT_VERSION_INT < (53<<16)
625
    const uint8_t *cur_ptr_deprecated;
626
    int cur_len_deprecated;
627
    AVPacket cur_pkt_deprecated;
628
#endif
629

    
630
    /* av_seek_frame() support */
631
    int64_t data_offset; /** offset of the first packet */
632
    int index_built;
633

    
634
    int mux_rate;
635
    int packet_size;
636
    int preload;
637
    int max_delay;
638

    
639
#define AVFMT_NOOUTPUTLOOP -1
640
#define AVFMT_INFINITEOUTPUTLOOP 0
641
    /** number of times to loop output in formats that support it */
642
    int loop_output;
643

    
644
    int flags;
645
#define AVFMT_FLAG_GENPTS       0x0001 ///< Generate missing pts even if it requires parsing future frames.
646
#define AVFMT_FLAG_IGNIDX       0x0002 ///< Ignore index.
647
#define AVFMT_FLAG_NONBLOCK     0x0004 ///< Do not block when reading packets from input.
648

    
649
    int loop_input;
650
    /** decoding: size of data to probe; encoding: unused. */
651
    unsigned int probesize;
652

    
653
    /**
654
     * Maximum time (in AV_TIME_BASE units) during which the input should
655
     * be analyzed in av_find_stream_info().
656
     */
657
    int max_analyze_duration;
658

    
659
    const uint8_t *key;
660
    int keylen;
661

    
662
    unsigned int nb_programs;
663
    AVProgram **programs;
664

    
665
    /**
666
     * Forced video codec_id.
667
     * Demuxing: Set by user.
668
     */
669
    enum CodecID video_codec_id;
670
    /**
671
     * Forced audio codec_id.
672
     * Demuxing: Set by user.
673
     */
674
    enum CodecID audio_codec_id;
675
    /**
676
     * Forced subtitle codec_id.
677
     * Demuxing: Set by user.
678
     */
679
    enum CodecID subtitle_codec_id;
680

    
681
    /**
682
     * Maximum amount of memory in bytes to use for the index of each stream.
683
     * If the index exceeds this size, entries will be discarded as
684
     * needed to maintain a smaller size. This can lead to slower or less
685
     * accurate seeking (depends on demuxer).
686
     * Demuxers for which a full in-memory index is mandatory will ignore
687
     * this.
688
     * muxing  : unused
689
     * demuxing: set by user
690
     */
691
    unsigned int max_index_size;
692

    
693
    /**
694
     * Maximum amount of memory in bytes to use for buffering frames
695
     * obtained from realtime capture devices.
696
     */
697
    unsigned int max_picture_buffer;
698

    
699
    unsigned int nb_chapters;
700
    AVChapter **chapters;
701

    
702
    /**
703
     * Flags to enable debugging.
704
     */
705
    int debug;
706
#define FF_FDEBUG_TS        0x0001
707

    
708
    /**
709
     * Raw packets from the demuxer, prior to parsing and decoding.
710
     * This buffer is used for buffering packets until the codec can
711
     * be identified, as parsing cannot be done without knowing the
712
     * codec.
713
     */
714
    struct AVPacketList *raw_packet_buffer;
715
    struct AVPacketList *raw_packet_buffer_end;
716

    
717
    struct AVPacketList *packet_buffer_end;
718

    
719
    AVMetadata *metadata;
720
} AVFormatContext;
721

    
722
typedef struct AVPacketList {
723
    AVPacket pkt;
724
    struct AVPacketList *next;
725
} AVPacketList;
726

    
727
#if LIBAVFORMAT_VERSION_INT < (53<<16)
728
extern AVInputFormat *first_iformat;
729
extern AVOutputFormat *first_oformat;
730
#endif
731

    
732
/**
733
 * If f is NULL, returns the first registered input format,
734
 * if f is non-NULL, returns the next registered input format after f
735
 * or NULL if f is the last one.
736
 */
737
AVInputFormat  *av_iformat_next(AVInputFormat  *f);
738

    
739
/**
740
 * If f is NULL, returns the first registered output format,
741
 * if f is non-NULL, returns the next registered output format after f
742
 * or NULL if f is the last one.
743
 */
744
AVOutputFormat *av_oformat_next(AVOutputFormat *f);
745

    
746
enum CodecID av_guess_image2_codec(const char *filename);
747

    
748
/* XXX: Use automatic init with either ELF sections or C file parser */
749
/* modules. */
750

    
751
/* utils.c */
752
void av_register_input_format(AVInputFormat *format);
753
void av_register_output_format(AVOutputFormat *format);
754
AVOutputFormat *guess_stream_format(const char *short_name,
755
                                    const char *filename,
756
                                    const char *mime_type);
757
AVOutputFormat *guess_format(const char *short_name,
758
                             const char *filename,
759
                             const char *mime_type);
760

    
761
/**
762
 * Guesses the codec ID based upon muxer and filename.
763
 */
764
enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
765
                            const char *filename, const char *mime_type,
766
                            enum CodecType type);
767

    
768
/**
769
 * Send a nice hexadecimal dump of a buffer to the specified file stream.
770
 *
771
 * @param f The file stream pointer where the dump should be sent to.
772
 * @param buf buffer
773
 * @param size buffer size
774
 *
775
 * @see av_hex_dump_log, av_pkt_dump, av_pkt_dump_log
776
 */
777
void av_hex_dump(FILE *f, uint8_t *buf, int size);
778

    
779
/**
780
 * Send a nice hexadecimal dump of a buffer to the log.
781
 *
782
 * @param avcl A pointer to an arbitrary struct of which the first field is a
783
 * pointer to an AVClass struct.
784
 * @param level The importance level of the message, lower values signifying
785
 * higher importance.
786
 * @param buf buffer
787
 * @param size buffer size
788
 *
789
 * @see av_hex_dump, av_pkt_dump, av_pkt_dump_log
790
 */
791
void av_hex_dump_log(void *avcl, int level, uint8_t *buf, int size);
792

    
793
/**
794
 * Send a nice dump of a packet to the specified file stream.
795
 *
796
 * @param f The file stream pointer where the dump should be sent to.
797
 * @param pkt packet to dump
798
 * @param dump_payload True if the payload must be displayed, too.
799
 */
800
void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
801

    
802
/**
803
 * Send a nice dump of a packet to the log.
804
 *
805
 * @param avcl A pointer to an arbitrary struct of which the first field is a
806
 * pointer to an AVClass struct.
807
 * @param level The importance level of the message, lower values signifying
808
 * higher importance.
809
 * @param pkt packet to dump
810
 * @param dump_payload True if the payload must be displayed, too.
811
 */
812
void av_pkt_dump_log(void *avcl, int level, AVPacket *pkt, int dump_payload);
813

    
814
/**
815
 * Initialize libavformat and register all the muxers, demuxers and
816
 * protocols. If you do not call this function, then you can select
817
 * exactly which formats you want to support.
818
 *
819
 * @see av_register_input_format()
820
 * @see av_register_output_format()
821
 * @see av_register_protocol()
822
 */
823
void av_register_all(void);
824

    
825
/** codec tag <-> codec id */
826
enum CodecID av_codec_get_id(const struct AVCodecTag * const *tags, unsigned int tag);
827
unsigned int av_codec_get_tag(const struct AVCodecTag * const *tags, enum CodecID id);
828

    
829
/* media file input */
830

    
831
/**
832
 * Finds AVInputFormat based on the short name of the input format.
833
 */
834
AVInputFormat *av_find_input_format(const char *short_name);
835

    
836
/**
837
 * Guess file format.
838
 *
839
 * @param is_opened Whether the file is already opened; determines whether
840
 *                  demuxers with or without AVFMT_NOFILE are probed.
841
 */
842
AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
843

    
844
/**
845
 * Allocates all the structures needed to read an input stream.
846
 *        This does not open the needed codecs for decoding the stream[s].
847
 */
848
int av_open_input_stream(AVFormatContext **ic_ptr,
849
                         ByteIOContext *pb, const char *filename,
850
                         AVInputFormat *fmt, AVFormatParameters *ap);
851

    
852
/**
853
 * Open a media file as input. The codecs are not opened. Only the file
854
 * header (if present) is read.
855
 *
856
 * @param ic_ptr The opened media file handle is put here.
857
 * @param filename filename to open
858
 * @param fmt If non-NULL, force the file format to use.
859
 * @param buf_size optional buffer size (zero if default is OK)
860
 * @param ap Additional parameters needed when opening the file
861
 *           (NULL if default).
862
 * @return 0 if OK, AVERROR_xxx otherwise
863
 */
864
int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
865
                       AVInputFormat *fmt,
866
                       int buf_size,
867
                       AVFormatParameters *ap);
868

    
869
#if LIBAVFORMAT_VERSION_MAJOR < 53
870
/**
871
 * @deprecated Use avformat_alloc_context() instead.
872
 */
873
attribute_deprecated AVFormatContext *av_alloc_format_context(void);
874
#endif
875

    
876
/**
877
 * Allocate an AVFormatContext.
878
 * Can be freed with av_free() but do not forget to free everything you
879
 * explicitly allocated as well!
880
 */
881
AVFormatContext *avformat_alloc_context(void);
882

    
883
/**
884
 * Read packets of a media file to get stream information. This
885
 * is useful for file formats with no headers such as MPEG. This
886
 * function also computes the real framerate in case of MPEG-2 repeat
887
 * frame mode.
888
 * The logical file position is not changed by this function;
889
 * examined packets may be buffered for later processing.
890
 *
891
 * @param ic media file handle
892
 * @return >=0 if OK, AVERROR_xxx on error
893
 * @todo Let the user decide somehow what information is needed so that
894
 *       we do not waste time getting stuff the user does not need.
895
 */
896
int av_find_stream_info(AVFormatContext *ic);
897

    
898
/**
899
 * Read a transport packet from a media file.
900
 *
901
 * This function is obsolete and should never be used.
902
 * Use av_read_frame() instead.
903
 *
904
 * @param s media file handle
905
 * @param pkt is filled
906
 * @return 0 if OK, AVERROR_xxx on error
907
 */
908
int av_read_packet(AVFormatContext *s, AVPacket *pkt);
909

    
910
/**
911
 * Return the next frame of a stream.
912
 *
913
 * The returned packet is valid
914
 * until the next av_read_frame() or until av_close_input_file() and
915
 * must be freed with av_free_packet. For video, the packet contains
916
 * exactly one frame. For audio, it contains an integer number of
917
 * frames if each frame has a known fixed size (e.g. PCM or ADPCM
918
 * data). If the audio frames have a variable size (e.g. MPEG audio),
919
 * then it contains one frame.
920
 *
921
 * pkt->pts, pkt->dts and pkt->duration are always set to correct
922
 * values in AVStream.time_base units (and guessed if the format cannot
923
 * provide them). pkt->pts can be AV_NOPTS_VALUE if the video format
924
 * has B-frames, so it is better to rely on pkt->dts if you do not
925
 * decompress the payload.
926
 *
927
 * @return 0 if OK, < 0 on error or end of file
928
 */
929
int av_read_frame(AVFormatContext *s, AVPacket *pkt);
930

    
931
/**
932
 * Seek to the keyframe at timestamp.
933
 * 'timestamp' in 'stream_index'.
934
 * @param stream_index If stream_index is (-1), a default
935
 * stream is selected, and timestamp is automatically converted
936
 * from AV_TIME_BASE units to the stream specific time_base.
937
 * @param timestamp Timestamp in AVStream.time_base units
938
 *        or, if no stream is specified, in AV_TIME_BASE units.
939
 * @param flags flags which select direction and seeking mode
940
 * @return >= 0 on success
941
 */
942
int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp,
943
                  int flags);
944

    
945
/**
946
 * Seek to timestamp ts.
947
 * Seeking will be done so that the point from which all active streams
948
 * can be presented successfully will be closest to ts and within min/max_ts.
949
 * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
950
 *
951
 * If flags contain AVSEEK_FLAG_BYTE, then all timestamps are in bytes and
952
 * are the file position (this may not be supported by all demuxers).
953
 * If flags contain AVSEEK_FLAG_FRAME, then all timestamps are in frames
954
 * in the stream with stream_index (this may not be supported by all demuxers).
955
 * Otherwise all timestamps are in units of the stream selected by stream_index
956
 * or if stream_index is -1, in AV_TIME_BASE units.
957
 * If flags contain AVSEEK_FLAG_ANY, then non-keyframes are treated as
958
 * keyframes (this may not be supported by all demuxers).
959
 *
960
 * @param stream_index index of the stream which is used as time base reference
961
 * @param min_ts smallest acceptable timestamp
962
 * @param ts target timestamp
963
 * @param max_ts largest acceptable timestamp
964
 * @param flags flags
965
 * @returns >=0 on success, error code otherwise
966
 *
967
 * @NOTE This is part of the new seek API which is still under construction.
968
 *       Thus do not use this yet. It may change at any time, do not expect
969
 *       ABI compatibility yet!
970
 */
971
int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
972

    
973
/**
974
 * Start playing a network-based stream (e.g. RTSP stream) at the
975
 * current position.
976
 */
977
int av_read_play(AVFormatContext *s);
978

    
979
/**
980
 * Pause a network-based stream (e.g. RTSP stream).
981
 *
982
 * Use av_read_play() to resume it.
983
 */
984
int av_read_pause(AVFormatContext *s);
985

    
986
/**
987
 * Free a AVFormatContext allocated by av_open_input_stream.
988
 * @param s context to free
989
 */
990
void av_close_input_stream(AVFormatContext *s);
991

    
992
/**
993
 * Close a media file (but not its codecs).
994
 *
995
 * @param s media file handle
996
 */
997
void av_close_input_file(AVFormatContext *s);
998

    
999
/**
1000
 * Add a new stream to a media file.
1001
 *
1002
 * Can only be called in the read_header() function. If the flag
1003
 * AVFMTCTX_NOHEADER is in the format context, then new streams
1004
 * can be added in read_packet too.
1005
 *
1006
 * @param s media file handle
1007
 * @param id file-format-dependent stream ID
1008
 */
1009
AVStream *av_new_stream(AVFormatContext *s, int id);
1010
AVProgram *av_new_program(AVFormatContext *s, int id);
1011

    
1012
/**
1013
 * Add a new chapter.
1014
 * This function is NOT part of the public API
1015
 * and should ONLY be used by demuxers.
1016
 *
1017
 * @param s media file handle
1018
 * @param id unique ID for this chapter
1019
 * @param start chapter start time in time_base units
1020
 * @param end chapter end time in time_base units
1021
 * @param title chapter title
1022
 *
1023
 * @return AVChapter or NULL on error
1024
 */
1025
AVChapter *ff_new_chapter(AVFormatContext *s, int id, AVRational time_base,
1026
                          int64_t start, int64_t end, const char *title);
1027

    
1028
/**
1029
 * Set the pts for a given stream.
1030
 *
1031
 * @param s stream
1032
 * @param pts_wrap_bits number of bits effectively used by the pts
1033
 *        (used for wrap control, 33 is the value for MPEG)
1034
 * @param pts_num numerator to convert to seconds (MPEG: 1)
1035
 * @param pts_den denominator to convert to seconds (MPEG: 90000)
1036
 */
1037
void av_set_pts_info(AVStream *s, int pts_wrap_bits,
1038
                     int pts_num, int pts_den);
1039

    
1040
#define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
1041
#define AVSEEK_FLAG_BYTE     2 ///< seeking based on position in bytes
1042
#define AVSEEK_FLAG_ANY      4 ///< seek to any frame, even non-keyframes
1043

    
1044
int av_find_default_stream_index(AVFormatContext *s);
1045

    
1046
/**
1047
 * Gets the index for a specific timestamp.
1048
 * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond
1049
 *                 to the timestamp which is <= the requested one, if backward
1050
 *                 is 0, then it will be >=
1051
 *              if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
1052
 * @return < 0 if no such timestamp could be found
1053
 */
1054
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
1055

    
1056
/**
1057
 * Ensures the index uses less memory than the maximum specified in
1058
 * AVFormatContext.max_index_size by discarding entries if it grows
1059
 * too large.
1060
 * This function is not part of the public API and should only be called
1061
 * by demuxers.
1062
 */
1063
void ff_reduce_index(AVFormatContext *s, int stream_index);
1064

    
1065
/**
1066
 * Add an index entry into a sorted list. Update the entry if the list
1067
 * already contains it.
1068
 *
1069
 * @param timestamp timestamp in the time base of the given stream
1070
 */
1071
int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp,
1072
                       int size, int distance, int flags);
1073

    
1074
/**
1075
 * Does a binary search using av_index_search_timestamp() and
1076
 * AVCodec.read_timestamp().
1077
 * This is not supposed to be called directly by a user application,
1078
 * but by demuxers.
1079
 * @param target_ts target timestamp in the time base of the given stream
1080
 * @param stream_index stream number
1081
 */
1082
int av_seek_frame_binary(AVFormatContext *s, int stream_index,
1083
                         int64_t target_ts, int flags);
1084

    
1085
/**
1086
 * Updates cur_dts of all streams based on the given timestamp and AVStream.
1087
 *
1088
 * Stream ref_st unchanged, others set cur_dts in their native time base.
1089
 * Only needed for timestamp wrapping or if (dts not set and pts!=dts).
1090
 * @param timestamp new dts expressed in time_base of param ref_st
1091
 * @param ref_st reference stream giving time_base of param timestamp
1092
 */
1093
void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
1094

    
1095
/**
1096
 * Does a binary search using read_timestamp().
1097
 * This is not supposed to be called directly by a user application,
1098
 * but by demuxers.
1099
 * @param target_ts target timestamp in the time base of the given stream
1100
 * @param stream_index stream number
1101
 */
1102
int64_t av_gen_search(AVFormatContext *s, int stream_index,
1103
                      int64_t target_ts, int64_t pos_min,
1104
                      int64_t pos_max, int64_t pos_limit,
1105
                      int64_t ts_min, int64_t ts_max,
1106
                      int flags, int64_t *ts_ret,
1107
                      int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
1108

    
1109
/** media file output */
1110
int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
1111

    
1112
/**
1113
 * Allocate the stream private data and write the stream header to an
1114
 * output media file.
1115
 *
1116
 * @param s media file handle
1117
 * @return 0 if OK, AVERROR_xxx on error
1118
 */
1119
int av_write_header(AVFormatContext *s);
1120

    
1121
/**
1122
 * Write a packet to an output media file.
1123
 *
1124
 * The packet shall contain one audio or video frame.
1125
 * The packet must be correctly interleaved according to the container
1126
 * specification, if not then av_interleaved_write_frame must be used.
1127
 *
1128
 * @param s media file handle
1129
 * @param pkt The packet, which contains the stream_index, buf/buf_size,
1130
              dts/pts, ...
1131
 * @return < 0 on error, = 0 if OK, 1 if end of stream wanted
1132
 */
1133
int av_write_frame(AVFormatContext *s, AVPacket *pkt);
1134

    
1135
/**
1136
 * Writes a packet to an output media file ensuring correct interleaving.
1137
 *
1138
 * The packet must contain one audio or video frame.
1139
 * If the packets are already correctly interleaved, the application should
1140
 * call av_write_frame() instead as it is slightly faster. It is also important
1141
 * to keep in mind that completely non-interleaved input will need huge amounts
1142
 * of memory to interleave with this, so it is preferable to interleave at the
1143
 * demuxer level.
1144
 *
1145
 * @param s media file handle
1146
 * @param pkt The packet, which contains the stream_index, buf/buf_size,
1147
              dts/pts, ...
1148
 * @return < 0 on error, = 0 if OK, 1 if end of stream wanted
1149
 */
1150
int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
1151

    
1152
/**
1153
 * Interleave a packet per dts in an output media file.
1154
 *
1155
 * Packets with pkt->destruct == av_destruct_packet will be freed inside this
1156
 * function, so they cannot be used after it. Note that calling av_free_packet()
1157
 * on them is still safe.
1158
 *
1159
 * @param s media file handle
1160
 * @param out the interleaved packet will be output here
1161
 * @param in the input packet
1162
 * @param flush 1 if no further packets are available as input and all
1163
 *              remaining packets should be output
1164
 * @return 1 if a packet was output, 0 if no packet could be output,
1165
 *         < 0 if an error occurred
1166
 */
1167
int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
1168
                                 AVPacket *pkt, int flush);
1169

    
1170
/**
1171
 * @brief Write the stream trailer to an output media file and
1172
 *        free the file private data.
1173
 *
1174
 * May only be called after a successful call to av_write_header.
1175
 *
1176
 * @param s media file handle
1177
 * @return 0 if OK, AVERROR_xxx on error
1178
 */
1179
int av_write_trailer(AVFormatContext *s);
1180

    
1181
void dump_format(AVFormatContext *ic,
1182
                 int index,
1183
                 const char *url,
1184
                 int is_output);
1185

    
1186
#if LIBAVFORMAT_VERSION_MAJOR < 53
1187
/**
1188
 * Parses width and height out of string str.
1189
 * @deprecated Use av_parse_video_frame_size instead.
1190
 */
1191
attribute_deprecated int parse_image_size(int *width_ptr, int *height_ptr,
1192
                                          const char *str);
1193

    
1194
/**
1195
 * Converts framerate from a string to a fraction.
1196
 * @deprecated Use av_parse_video_frame_rate instead.
1197
 */
1198
attribute_deprecated int parse_frame_rate(int *frame_rate, int *frame_rate_base,
1199
                                          const char *arg);
1200
#endif
1201

    
1202
/**
1203
 * Parses \p datestr and returns a corresponding number of microseconds.
1204
 * @param datestr String representing a date or a duration.
1205
 * - If a date the syntax is:
1206
 * @code
1207
 *  [{YYYY-MM-DD|YYYYMMDD}]{T| }{HH[:MM[:SS[.m...]]][Z]|HH[MM[SS[.m...]]][Z]}
1208
 * @endcode
1209
 * Time is local time unless Z is appended, in which case it is
1210
 * interpreted as UTC.
1211
 * If the year-month-day part is not specified it takes the current
1212
 * year-month-day.
1213
 * Returns the number of microseconds since 1st of January, 1970 up to
1214
 * the time of the parsed date or INT64_MIN if \p datestr cannot be
1215
 * successfully parsed.
1216
 * - If a duration the syntax is:
1217
 * @code
1218
 *  [-]HH[:MM[:SS[.m...]]]
1219
 *  [-]S+[.m...]
1220
 * @endcode
1221
 * Returns the number of microseconds contained in a time interval
1222
 * with the specified duration or INT64_MIN if \p datestr cannot be
1223
 * successfully parsed.
1224
 * @param duration Flag which tells how to interpret \p datestr, if
1225
 * not zero \p datestr is interpreted as a duration, otherwise as a
1226
 * date.
1227
 */
1228
int64_t parse_date(const char *datestr, int duration);
1229

    
1230
/** Gets the current time in microseconds. */
1231
int64_t av_gettime(void);
1232

    
1233
/* ffm-specific for ffserver */
1234
#define FFM_PACKET_SIZE 4096
1235
int64_t ffm_read_write_index(int fd);
1236
int ffm_write_write_index(int fd, int64_t pos);
1237
void ffm_set_write_index(AVFormatContext *s, int64_t pos, int64_t file_size);
1238

    
1239
/**
1240
 * Attempts to find a specific tag in a URL.
1241
 *
1242
 * syntax: '?tag1=val1&tag2=val2...'. Little URL decoding is done.
1243
 * Return 1 if found.
1244
 */
1245
int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
1246

    
1247
/**
1248
 * Returns in 'buf' the path with '%d' replaced by a number.
1249
 *
1250
 * Also handles the '%0nd' format where 'n' is the total number
1251
 * of digits and '%%'.
1252
 *
1253
 * @param buf destination buffer
1254
 * @param buf_size destination buffer size
1255
 * @param path numbered sequence string
1256
 * @param number frame number
1257
 * @return 0 if OK, -1 on format error
1258
 */
1259
int av_get_frame_filename(char *buf, int buf_size,
1260
                          const char *path, int number);
1261

    
1262
/**
1263
 * Check whether filename actually is a numbered sequence generator.
1264
 *
1265
 * @param filename possible numbered sequence string
1266
 * @return 1 if a valid numbered sequence string, 0 otherwise
1267
 */
1268
int av_filename_number_test(const char *filename);
1269

    
1270
/**
1271
 * Generate an SDP for an RTP session.
1272
 *
1273
 * @param ac array of AVFormatContexts describing the RTP streams. If the
1274
 *           array is composed by only one context, such context can contain
1275
 *           multiple AVStreams (one AVStream per RTP stream). Otherwise,
1276
 *           all the contexts in the array (an AVCodecContext per RTP stream)
1277
 *           must contain only one AVStream.
1278
 * @param n_files number of AVCodecContexts contained in ac
1279
 * @param buff buffer where the SDP will be stored (must be allocated by
1280
 *             the caller)
1281
 * @param size the size of the buffer
1282
 * @return 0 if OK, AVERROR_xxx on error
1283
 */
1284
int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size);
1285

    
1286
#ifdef HAVE_AV_CONFIG_H
1287

    
1288
void ff_dynarray_add(intptr_t **tab_ptr, int *nb_ptr, intptr_t elem);
1289

    
1290
#ifdef __GNUC__
1291
#define dynarray_add(tab, nb_ptr, elem)\
1292
do {\
1293
    __typeof__(tab) _tab = (tab);\
1294
    __typeof__(elem) _elem = (elem);\
1295
    (void)sizeof(**_tab == _elem); /* check that types are compatible */\
1296
    ff_dynarray_add((intptr_t **)_tab, nb_ptr, (intptr_t)_elem);\
1297
} while(0)
1298
#else
1299
#define dynarray_add(tab, nb_ptr, elem)\
1300
do {\
1301
    ff_dynarray_add((intptr_t **)(tab), nb_ptr, (intptr_t)(elem));\
1302
} while(0)
1303
#endif
1304

    
1305
time_t mktimegm(struct tm *tm);
1306
struct tm *brktimegm(time_t secs, struct tm *tm);
1307
const char *small_strptime(const char *p, const char *fmt,
1308
                           struct tm *dt);
1309

    
1310
struct in_addr;
1311
int resolve_host(struct in_addr *sin_addr, const char *hostname);
1312

    
1313
void url_split(char *proto, int proto_size,
1314
               char *authorization, int authorization_size,
1315
               char *hostname, int hostname_size,
1316
               int *port_ptr,
1317
               char *path, int path_size,
1318
               const char *url);
1319

    
1320
int match_ext(const char *filename, const char *extensions);
1321

    
1322
#endif /* HAVE_AV_CONFIG_H */
1323

    
1324
#endif /* AVFORMAT_AVFORMAT_H */