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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 25
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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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/*
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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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/**
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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 comparissions.
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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 tag tag to add to m, key and value will be av_strduped.
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 * @return >= 0 if success otherwise error code that is <0.
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 */
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int av_metadata_set(AVMetadata **m, AVMetadataTag tag);
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/**
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 * Free 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.
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     * This is the time at which the decompressed packet will be presented
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     * 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, these 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.
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     * This is the time at which the 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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 * @deprecated Use AVRational instead.
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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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struct AVFormatContext;
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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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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 CODEC_ID_NONE terminated.
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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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    /* 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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     */
312
    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 by 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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     */
320
    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. */
330
    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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    /**
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     * Seek to a given timestamp relative to the frames in
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     * stream component stream_index.
337
     * @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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     */
342
    int (*read_seek)(struct AVFormatContext *,
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                     int stream_index, int64_t timestamp, int flags);
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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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     */
348
    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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    /* 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 {
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    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.
399
 * Removal, reordering and changes to existing fields require a major
400
 * version bump.
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 * sizeof(AVStream) must not be used outside libav*.
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 */
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typedef struct AVStream {
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    int index;    /**< stream index in AVFormatContext */
405
    int id;       /**< format-specific stream ID */
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    AVCodecContext *codec; /**< codec context */
407
    /**
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     * Real base frame rate of the stream.
409
     * This is the lowest frame rate with which all timestamps can be
410
     * represented accurately (it is the least common multiple of all
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     * frame rates 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.
414
     */
415
    AVRational r_frame_rate;
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    void *priv_data;
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418
    /* internal data used in av_find_stream_info() */
419
    int64_t first_dts;
420
    /** encoding: pts generation when outputting stream */
421
    struct AVFrac pts;
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    /**
424
     * This is the fundamental unit of time (in seconds) in terms
425
     * of which frame timestamps are represented. For fixed-fps content,
426
     * time base should be 1/frame rate and timestamp increments should be 1.
427
     */
428
    AVRational time_base;
429
    int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
430
    /* ffmpeg.c private use */
431
    int stream_copy; /**< If set, just copy stream. */
432
    enum AVDiscard discard; ///< Selects which packets can be discarded at will and do not need to be demuxed.
433
    //FIXME move stuff to a flags field?
434
    /** Quality, as it has been removed from AVCodecContext and put in AVVideoFrame.
435
     * MN: dunno if that is the right place for it */
436
    float quality;
437
    /**
438
     * Decoding: pts of the first frame of the stream, in stream time base.
439
     * Only set this if you are absolutely 100% sure that the value you set
440
     * it to really is the pts of the first frame.
441
     * This may be undefined (AV_NOPTS_VALUE).
442
     * @note The ASF header does NOT contain a correct start_time the ASF
443
     * demuxer must NOT set this.
444
     */
445
    int64_t start_time;
446
    /**
447
     * Decoding: duration of the stream, in stream time base.
448
     * If a source file does not specify a duration, but does specify
449
     * a bitrate, this value will be estimated from bitrate and file size.
450
     */
451
    int64_t duration;
452

    
453
    char language[4]; /** ISO 639 3-letter language code (empty string if undefined) */
454

    
455
    /* av_read_frame() support */
456
    enum AVStreamParseType need_parsing;
457
    struct AVCodecParserContext *parser;
458

    
459
    int64_t cur_dts;
460
    int last_IP_duration;
461
    int64_t last_IP_pts;
462
    /* av_seek_frame() support */
463
    AVIndexEntry *index_entries; /**< Only used if the format does not
464
                                    support seeking natively. */
465
    int nb_index_entries;
466
    unsigned int index_entries_allocated_size;
467

    
468
    int64_t nb_frames;                 ///< number of frames in this stream if known or 0
469

    
470
#if LIBAVFORMAT_VERSION_INT < (53<<16)
471
    int64_t unused[4+1];
472
#endif
473

    
474
    char *filename; /**< source filename of the stream */
475

    
476
    int disposition; /**< AV_DISPOSITION_* bit field */
477

    
478
    AVProbeData probe_data;
479
#define MAX_REORDER_DELAY 16
480
    int64_t pts_buffer[MAX_REORDER_DELAY+1];
481

    
482
    /**
483
     * sample aspect ratio (0 if unknown)
484
     * - encoding: Set by user.
485
     * - decoding: Set by libavformat.
486
     */
487
    AVRational sample_aspect_ratio;
488

    
489
    AVMetadata *metadata;
490

    
491
    /* av_read_frame() support */
492
    const uint8_t *cur_ptr;
493
    int cur_len;
494
    AVPacket cur_pkt;
495
} AVStream;
496

    
497
#define AV_PROGRAM_RUNNING 1
498

    
499
/**
500
 * New fields can be added to the end with minor version bumps.
501
 * Removal, reordering and changes to existing fields require a major
502
 * version bump.
503
 * sizeof(AVProgram) must not be used outside libav*.
504
 */
505
typedef struct AVProgram {
506
    int            id;
507
    char           *provider_name; ///< network name for DVB streams
508
    char           *name;          ///< service name for DVB streams
509
    int            flags;
510
    enum AVDiscard discard;        ///< selects which program to discard and which to feed to the caller
511
    unsigned int   *stream_index;
512
    unsigned int   nb_stream_indexes;
513
    AVMetadata *metadata;
514
} AVProgram;
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516
#define AVFMTCTX_NOHEADER      0x0001 /**< signal that no header is present
517
                                         (streams are added dynamically) */
518

    
519
typedef struct AVChapter {
520
    int id;                 ///< unique ID to identify the chapter
521
    AVRational time_base;   ///< time base in which the start/end timestamps are specified
522
    int64_t start, end;     ///< chapter start/end time in time_base units
523
    char *title;            ///< chapter title
524
    AVMetadata *metadata;
525
} AVChapter;
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527
#define MAX_STREAMS 20
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/**
530
 * Format I/O context.
531
 * New fields can be added to the end with minor version bumps.
532
 * Removal, reordering and changes to existing fields require a major
533
 * version bump.
534
 * sizeof(AVFormatContext) must not be used outside libav*.
535
 */
536
typedef struct AVFormatContext {
537
    const AVClass *av_class; /**< Set by av_alloc_format_context. */
538
    /* Can only be iformat or oformat, not both at the same time. */
539
    struct AVInputFormat *iformat;
540
    struct AVOutputFormat *oformat;
541
    void *priv_data;
542
    ByteIOContext *pb;
543
    unsigned int nb_streams;
544
    AVStream *streams[MAX_STREAMS];
545
    char filename[1024]; /**< input or output filename */
546
    /* stream info */
547
    int64_t timestamp;
548
    char title[512];
549
    char author[512];
550
    char copyright[512];
551
    char comment[512];
552
    char album[512];
553
    int year;  /**< ID3 year, 0 if none */
554
    int track; /**< track number, 0 if none */
555
    char genre[32]; /**< ID3 genre */
556

    
557
    int ctx_flags; /**< Format-specific flags, see AVFMTCTX_xx */
558
    /* private data for pts handling (do not modify directly). */
559
    /** This buffer is only needed when packets were already buffered but
560
       not decoded, for example to get the codec parameters in MPEG
561
       streams. */
562
    struct AVPacketList *packet_buffer;
563

    
564
    /** Decoding: position of the first frame of the component, in
565
       AV_TIME_BASE fractional seconds. NEVER set this value directly:
566
       It is deduced from the AVStream values.  */
567
    int64_t start_time;
568
    /** Decoding: duration of the stream, in AV_TIME_BASE fractional
569
       seconds. NEVER set this value directly: it is deduced from the
570
       AVStream values.  */
571
    int64_t duration;
572
    /** decoding: total file size, 0 if unknown */
573
    int64_t file_size;
574
    /** Decoding: total stream bitrate in bit/s, 0 if not
575
       available. Never set it directly if the file_size and the
576
       duration are known as ffmpeg can compute it automatically. */
577
    int bit_rate;
578

    
579
    /* av_read_frame() support */
580
    AVStream *cur_st;
581
#if LIBAVFORMAT_VERSION_INT < (53<<16)
582
    const uint8_t *cur_ptr_deprecated;
583
    int cur_len_deprecated;
584
    AVPacket cur_pkt_deprecated;
585
#endif
586

    
587
    /* av_seek_frame() support */
588
    int64_t data_offset; /** offset of the first packet */
589
    int index_built;
590

    
591
    int mux_rate;
592
    int packet_size;
593
    int preload;
594
    int max_delay;
595

    
596
#define AVFMT_NOOUTPUTLOOP -1
597
#define AVFMT_INFINITEOUTPUTLOOP 0
598
    /** number of times to loop output in formats that support it */
599
    int loop_output;
600

    
601
    int flags;
602
#define AVFMT_FLAG_GENPTS       0x0001 ///< Generate pts if missing even if it requires parsing future frames.
603
#define AVFMT_FLAG_IGNIDX       0x0002 ///< Ignore index.
604
#define AVFMT_FLAG_NONBLOCK     0x0004 ///< Do not block when reading packets from input.
605

    
606
    int loop_input;
607
    /** Decoding: size of data to probe; encoding: unused. */
608
    unsigned int probesize;
609

    
610
    /**
611
     * Maximum time (in AV_TIME_BASE units) during which the input should
612
     * be analyzed in av_find_stream_info().
613
     */
614
    int max_analyze_duration;
615

    
616
    const uint8_t *key;
617
    int keylen;
618

    
619
    unsigned int nb_programs;
620
    AVProgram **programs;
621

    
622
    /**
623
     * Forced video codec_id.
624
     * Demuxing: Set by user.
625
     */
626
    enum CodecID video_codec_id;
627
    /**
628
     * Forced audio codec_id.
629
     * Demuxing: Set by user.
630
     */
631
    enum CodecID audio_codec_id;
632
    /**
633
     * Forced subtitle codec_id.
634
     * Demuxing: Set by user.
635
     */
636
    enum CodecID subtitle_codec_id;
637

    
638
    /**
639
     * Maximum amount of memory in bytes to use per stream for the index.
640
     * If the needed index exceeds this size, entries will be discarded as
641
     * needed to maintain a smaller size. This can lead to slower or less
642
     * accurate seeking (depends on demuxer).
643
     * Demuxers for which a full in-memory index is mandatory will ignore
644
     * this.
645
     * muxing  : unused
646
     * demuxing: set by user
647
     */
648
    unsigned int max_index_size;
649

    
650
    /**
651
     * Maximum amount of memory in bytes to use for buffering frames
652
     * obtained from realtime capture devices.
653
     */
654
    unsigned int max_picture_buffer;
655

    
656
    unsigned int nb_chapters;
657
    AVChapter **chapters;
658

    
659
    /**
660
     * Flags to enable debugging.
661
     */
662
    int debug;
663
#define FF_FDEBUG_TS        0x0001
664

    
665
    /**
666
     * Raw packets from the demuxer, prior to parsing and decoding.
667
     * This buffer is used for buffering packets until the codec can
668
     * be identified, as parsing cannot be done without knowing the
669
     * codec.
670
     */
671
    struct AVPacketList *raw_packet_buffer;
672
    struct AVPacketList *raw_packet_buffer_end;
673

    
674
    struct AVPacketList *packet_buffer_end;
675

    
676
    AVMetadata *metadata;
677
} AVFormatContext;
678

    
679
typedef struct AVPacketList {
680
    AVPacket pkt;
681
    struct AVPacketList *next;
682
} AVPacketList;
683

    
684
#if LIBAVFORMAT_VERSION_INT < (53<<16)
685
extern AVInputFormat *first_iformat;
686
extern AVOutputFormat *first_oformat;
687
#endif
688

    
689
AVInputFormat  *av_iformat_next(AVInputFormat  *f);
690
AVOutputFormat *av_oformat_next(AVOutputFormat *f);
691

    
692
enum CodecID av_guess_image2_codec(const char *filename);
693

    
694
/* XXX: use automatic init with either ELF sections or C file parser */
695
/* modules */
696

    
697
/* utils.c */
698
void av_register_input_format(AVInputFormat *format);
699
void av_register_output_format(AVOutputFormat *format);
700
AVOutputFormat *guess_stream_format(const char *short_name,
701
                                    const char *filename,
702
                                    const char *mime_type);
703
AVOutputFormat *guess_format(const char *short_name,
704
                             const char *filename,
705
                             const char *mime_type);
706

    
707
/**
708
 * Guesses the codec ID based upon muxer and filename.
709
 */
710
enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
711
                            const char *filename, const char *mime_type,
712
                            enum CodecType type);
713

    
714
/**
715
 * Send a nice hexadecimal dump of a buffer to the specified file stream.
716
 *
717
 * @param f The file stream pointer where the dump should be sent to.
718
 * @param buf buffer
719
 * @param size buffer size
720
 *
721
 * @see av_hex_dump_log, av_pkt_dump, av_pkt_dump_log
722
 */
723
void av_hex_dump(FILE *f, uint8_t *buf, int size);
724

    
725
/**
726
 * Send a nice hexadecimal dump of a buffer to the log.
727
 *
728
 * @param avcl A pointer to an arbitrary struct of which the first field is a
729
 * pointer to an AVClass struct.
730
 * @param level The importance level of the message, lower values signifying
731
 * higher importance.
732
 * @param buf buffer
733
 * @param size buffer size
734
 *
735
 * @see av_hex_dump, av_pkt_dump, av_pkt_dump_log
736
 */
737
void av_hex_dump_log(void *avcl, int level, uint8_t *buf, int size);
738

    
739
/**
740
 * Send a nice dump of a packet to the specified file stream.
741
 *
742
 * @param f The file stream pointer where the dump should be sent to.
743
 * @param pkt packet to dump
744
 * @param dump_payload True if the payload must be displayed, too.
745
 */
746
void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
747

    
748
/**
749
 * Send a nice dump of a packet to the log.
750
 *
751
 * @param avcl A pointer to an arbitrary struct of which the first field is a
752
 * pointer to an AVClass struct.
753
 * @param level The importance level of the message, lower values signifying
754
 * higher importance.
755
 * @param pkt packet to dump
756
 * @param dump_payload True if the payload must be displayed, too.
757
 */
758
void av_pkt_dump_log(void *avcl, int level, AVPacket *pkt, int dump_payload);
759

    
760
/**
761
 * Initialize libavformat and register all the muxers, demuxers and
762
 * protocols. If you do not call this function, then you can select
763
 * exactly which formats you want to support.
764
 *
765
 * @see av_register_input_format()
766
 * @see av_register_output_format()
767
 * @see register_protocol()
768
 */
769
void av_register_all(void);
770

    
771
/** codec tag <-> codec id */
772
enum CodecID av_codec_get_id(const struct AVCodecTag * const *tags, unsigned int tag);
773
unsigned int av_codec_get_tag(const struct AVCodecTag * const *tags, enum CodecID id);
774

    
775
/* media file input */
776

    
777
/**
778
 * Finds AVInputFormat based on the short name of the input format.
779
 */
780
AVInputFormat *av_find_input_format(const char *short_name);
781

    
782
/**
783
 * Guess file format.
784
 *
785
 * @param is_opened Whether the file is already opened; determines whether
786
 *                  demuxers with or without AVFMT_NOFILE are probed.
787
 */
788
AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
789

    
790
/**
791
 * Allocates all the structures needed to read an input stream.
792
 *        This does not open the needed codecs for decoding the stream[s].
793
 */
794
int av_open_input_stream(AVFormatContext **ic_ptr,
795
                         ByteIOContext *pb, const char *filename,
796
                         AVInputFormat *fmt, AVFormatParameters *ap);
797

    
798
/**
799
 * Open a media file as input. The codecs are not opened. Only the file
800
 * header (if present) is read.
801
 *
802
 * @param ic_ptr The opened media file handle is put here.
803
 * @param filename filename to open
804
 * @param fmt If non-NULL, force the file format to use.
805
 * @param buf_size optional buffer size (zero if default is OK)
806
 * @param ap Additional parameters needed when opening the file
807
 *           (NULL if default).
808
 * @return 0 if OK, AVERROR_xxx otherwise
809
 */
810
int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
811
                       AVInputFormat *fmt,
812
                       int buf_size,
813
                       AVFormatParameters *ap);
814
/**
815
 * Allocate an AVFormatContext.
816
 * Can be freed with av_free() but do not forget to free everything you
817
 * explicitly allocated as well!
818
 */
819
AVFormatContext *av_alloc_format_context(void);
820

    
821
/**
822
 * Read packets of a media file to get stream information. This
823
 * is useful for file formats with no headers such as MPEG. This
824
 * function also computes the real frame rate in case of MPEG-2 repeat
825
 * frame mode.
826
 * The logical file position is not changed by this function;
827
 * examined packets may be buffered for later processing.
828
 *
829
 * @param ic media file handle
830
 * @return >=0 if OK, AVERROR_xxx on error
831
 * @todo Let the user decide somehow what information is needed so that
832
 *       we do not waste time getting stuff the user does not need.
833
 */
834
int av_find_stream_info(AVFormatContext *ic);
835

    
836
/**
837
 * Read a transport packet from a media file.
838
 *
839
 * This function is obsolete and should never be used.
840
 * Use av_read_frame() instead.
841
 *
842
 * @param s media file handle
843
 * @param pkt is filled
844
 * @return 0 if OK, AVERROR_xxx on error
845
 */
846
int av_read_packet(AVFormatContext *s, AVPacket *pkt);
847

    
848
/**
849
 * Return the next frame of a stream.
850
 *
851
 * The returned packet is valid
852
 * until the next av_read_frame() or until av_close_input_file() and
853
 * must be freed with av_free_packet. For video, the packet contains
854
 * exactly one frame. For audio, it contains an integer number of
855
 * frames if each frame has a known fixed size (e.g. PCM or ADPCM
856
 * data). If the audio frames have a variable size (e.g. MPEG audio),
857
 * then it contains one frame.
858
 *
859
 * pkt->pts, pkt->dts and pkt->duration are always set to correct
860
 * values in AVStream.timebase units (and guessed if the format cannot
861
 * provide them). pkt->pts can be AV_NOPTS_VALUE if the video format
862
 * has B-frames, so it is better to rely on pkt->dts if you do not
863
 * decompress the payload.
864
 *
865
 * @return 0 if OK, < 0 on error or end of file
866
 */
867
int av_read_frame(AVFormatContext *s, AVPacket *pkt);
868

    
869
/**
870
 * Seek to the key frame at timestamp.
871
 * 'timestamp' in 'stream_index'.
872
 * @param stream_index If stream_index is (-1), a default
873
 * stream is selected, and timestamp is automatically converted
874
 * from AV_TIME_BASE units to the stream specific time_base.
875
 * @param timestamp Timestamp in AVStream.time_base units
876
 *        or, if no stream is specified, in AV_TIME_BASE units.
877
 * @param flags flags which select direction and seeking mode
878
 * @return >= 0 on success
879
 */
880
int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp,
881
                  int flags);
882

    
883
/**
884
 * Start playing a network based stream (e.g. RTSP stream) at the
885
 * current position.
886
 */
887
int av_read_play(AVFormatContext *s);
888

    
889
/**
890
 * Pause a network based stream (e.g. RTSP stream).
891
 *
892
 * Use av_read_play() to resume it.
893
 */
894
int av_read_pause(AVFormatContext *s);
895

    
896
/**
897
 * Free a AVFormatContext allocated by av_open_input_stream.
898
 * @param s context to free
899
 */
900
void av_close_input_stream(AVFormatContext *s);
901

    
902
/**
903
 * Close a media file (but not its codecs).
904
 *
905
 * @param s media file handle
906
 */
907
void av_close_input_file(AVFormatContext *s);
908

    
909
/**
910
 * Add a new stream to a media file.
911
 *
912
 * Can only be called in the read_header() function. If the flag
913
 * AVFMTCTX_NOHEADER is in the format context, then new streams
914
 * can be added in read_packet too.
915
 *
916
 * @param s media file handle
917
 * @param id file-format-dependent stream ID
918
 */
919
AVStream *av_new_stream(AVFormatContext *s, int id);
920
AVProgram *av_new_program(AVFormatContext *s, int id);
921

    
922
/**
923
 * Add a new chapter.
924
 * This function is NOT part of the public API
925
 * and should ONLY be used by demuxers.
926
 *
927
 * @param s media file handle
928
 * @param id unique ID for this chapter
929
 * @param start chapter start time in time_base units
930
 * @param end chapter end time in time_base units
931
 * @param title chapter title
932
 *
933
 * @return AVChapter or NULL on error
934
 */
935
AVChapter *ff_new_chapter(AVFormatContext *s, int id, AVRational time_base,
936
                          int64_t start, int64_t end, const char *title);
937

    
938
/**
939
 * Set the pts for a given stream.
940
 *
941
 * @param s stream
942
 * @param pts_wrap_bits number of bits effectively used by the pts
943
 *        (used for wrap control, 33 is the value for MPEG)
944
 * @param pts_num numerator to convert to seconds (MPEG: 1)
945
 * @param pts_den denominator to convert to seconds (MPEG: 90000)
946
 */
947
void av_set_pts_info(AVStream *s, int pts_wrap_bits,
948
                     int pts_num, int pts_den);
949

    
950
#define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
951
#define AVSEEK_FLAG_BYTE     2 ///< seeking based on position in bytes
952
#define AVSEEK_FLAG_ANY      4 ///< seek to any frame, even non-keyframes
953

    
954
int av_find_default_stream_index(AVFormatContext *s);
955

    
956
/**
957
 * Gets the index for a specific timestamp.
958
 * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond
959
 *                 to the timestamp which is <= the requested one, if backward
960
 *                 is 0, then it will be >=
961
 *              if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
962
 * @return < 0 if no such timestamp could be found
963
 */
964
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
965

    
966
/**
967
 * Ensures the index uses less memory than the maximum specified in
968
 * AVFormatContext.max_index_size, by discarding entries if it grows
969
 * too large.
970
 * This function is not part of the public API and should only be called
971
 * by demuxers.
972
 */
973
void ff_reduce_index(AVFormatContext *s, int stream_index);
974

    
975
/**
976
 * Add an index entry into a sorted list. Update the entry if the list
977
 * already contains it.
978
 *
979
 * @param timestamp timestamp in the time base of the given stream
980
 */
981
int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp,
982
                       int size, int distance, int flags);
983

    
984
/**
985
 * Does a binary search using av_index_search_timestamp() and
986
 * AVCodec.read_timestamp().
987
 * This is not supposed to be called directly by a user application,
988
 * but by demuxers.
989
 * @param target_ts target timestamp in the time base of the given stream
990
 * @param stream_index stream number
991
 */
992
int av_seek_frame_binary(AVFormatContext *s, int stream_index,
993
                         int64_t target_ts, int flags);
994

    
995
/**
996
 * Updates cur_dts of all streams based on the given timestamp and AVStream.
997
 *
998
 * Stream ref_st unchanged, others set cur_dts in their native time base.
999
 * Only needed for timestamp wrapping or if (dts not set and pts!=dts).
1000
 * @param timestamp new dts expressed in time_base of param ref_st
1001
 * @param ref_st reference stream giving time_base of param timestamp
1002
 */
1003
void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
1004

    
1005
/**
1006
 * Does a binary search using read_timestamp().
1007
 * This is not supposed to be called directly by a user application,
1008
 * but by demuxers.
1009
 * @param target_ts target timestamp in the time base of the given stream
1010
 * @param stream_index stream number
1011
 */
1012
int64_t av_gen_search(AVFormatContext *s, int stream_index,
1013
                      int64_t target_ts, int64_t pos_min,
1014
                      int64_t pos_max, int64_t pos_limit,
1015
                      int64_t ts_min, int64_t ts_max,
1016
                      int flags, int64_t *ts_ret,
1017
                      int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
1018

    
1019
/** media file output */
1020
int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
1021

    
1022
/**
1023
 * Allocate the stream private data and write the stream header to an
1024
 * output media file.
1025
 *
1026
 * @param s media file handle
1027
 * @return 0 if OK, AVERROR_xxx on error
1028
 */
1029
int av_write_header(AVFormatContext *s);
1030

    
1031
/**
1032
 * Write a packet to an output media file.
1033
 *
1034
 * The packet shall contain one audio or video frame.
1035
 * The packet must be correctly interleaved according to the container
1036
 * specification, if not then av_interleaved_write_frame must be used.
1037
 *
1038
 * @param s media file handle
1039
 * @param pkt The packet, which contains the stream_index, buf/buf_size,
1040
              dts/pts, ...
1041
 * @return < 0 on error, = 0 if OK, 1 if end of stream wanted
1042
 */
1043
int av_write_frame(AVFormatContext *s, AVPacket *pkt);
1044

    
1045
/**
1046
 * Writes a packet to an output media file ensuring correct interleaving.
1047
 *
1048
 * The packet must contain one audio or video frame.
1049
 * If the packets are already correctly interleaved the application should
1050
 * call av_write_frame() instead as it is slightly faster. It is also important
1051
 * to keep in mind that completely non-interleaved input will need huge amounts
1052
 * of memory to interleave with this, so it is preferable to interleave at the
1053
 * demuxer level.
1054
 *
1055
 * @param s media file handle
1056
 * @param pkt The packet, which contains the stream_index, buf/buf_size,
1057
              dts/pts, ...
1058
 * @return < 0 on error, = 0 if OK, 1 if end of stream wanted
1059
 */
1060
int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
1061

    
1062
/**
1063
 * Interleave a packet per dts in an output media file.
1064
 *
1065
 * Packets with pkt->destruct == av_destruct_packet will be freed inside this
1066
 * function, so they cannot be used after it, note calling av_free_packet()
1067
 * on them is still safe.
1068
 *
1069
 * @param s media file handle
1070
 * @param out the interleaved packet will be output here
1071
 * @param in the input packet
1072
 * @param flush 1 if no further packets are available as input and all
1073
 *              remaining packets should be output
1074
 * @return 1 if a packet was output, 0 if no packet could be output,
1075
 *         < 0 if an error occurred
1076
 */
1077
int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
1078
                                 AVPacket *pkt, int flush);
1079

    
1080
/**
1081
 * @brief Write the stream trailer to an output media file and
1082
 *        free the file private data.
1083
 *
1084
 * May only be called after a successful call to av_write_header.
1085
 *
1086
 * @param s media file handle
1087
 * @return 0 if OK, AVERROR_xxx on error
1088
 */
1089
int av_write_trailer(AVFormatContext *s);
1090

    
1091
void dump_format(AVFormatContext *ic,
1092
                 int index,
1093
                 const char *url,
1094
                 int is_output);
1095

    
1096
#if LIBAVFORMAT_VERSION_MAJOR < 53
1097
/**
1098
 * Parses width and height out of string str.
1099
 * @deprecated Use av_parse_video_frame_size instead.
1100
 */
1101
attribute_deprecated int parse_image_size(int *width_ptr, int *height_ptr,
1102
                                          const char *str);
1103

    
1104
/**
1105
 * Converts frame rate from string to a fraction.
1106
 * @deprecated Use av_parse_video_frame_rate instead.
1107
 */
1108
attribute_deprecated int parse_frame_rate(int *frame_rate, int *frame_rate_base,
1109
                                          const char *arg);
1110
#endif
1111

    
1112
/**
1113
 * Parses \p datestr and returns a corresponding number of microseconds.
1114
 * @param datestr String representing a date or a duration.
1115
 * - If a date the syntax is:
1116
 * @code
1117
 *  [{YYYY-MM-DD|YYYYMMDD}]{T| }{HH[:MM[:SS[.m...]]][Z]|HH[MM[SS[.m...]]][Z]}
1118
 * @endcode
1119
 * Time is local time unless Z is appended, in which case it is
1120
 * interpreted as UTC.
1121
 * If the year-month-day part is not specified it takes the current
1122
 * year-month-day.
1123
 * Returns the number of microseconds since 1st of January, 1970 up to
1124
 * the time of the parsed date or INT64_MIN if \p datestr cannot be
1125
 * successfully parsed.
1126
 * - If a duration the syntax is:
1127
 * @code
1128
 *  [-]HH[:MM[:SS[.m...]]]
1129
 *  [-]S+[.m...]
1130
 * @endcode
1131
 * Returns the number of microseconds contained in a time interval
1132
 * with the specified duration or INT64_MIN if \p datestr cannot be
1133
 * successfully parsed.
1134
 * @param duration Flag which tells how to interpret \p datestr, if
1135
 * not zero \p datestr is interpreted as a duration, otherwise as a
1136
 * date.
1137
 */
1138
int64_t parse_date(const char *datestr, int duration);
1139

    
1140
/** Gets the current time in microseconds. */
1141
int64_t av_gettime(void);
1142

    
1143
/* ffm-specific for ffserver */
1144
#define FFM_PACKET_SIZE 4096
1145
int64_t ffm_read_write_index(int fd);
1146
void ffm_write_write_index(int fd, int64_t pos);
1147
void ffm_set_write_index(AVFormatContext *s, int64_t pos, int64_t file_size);
1148

    
1149
/**
1150
 * Attempts to find a specific tag in a URL.
1151
 *
1152
 * syntax: '?tag1=val1&tag2=val2...'. Little URL decoding is done.
1153
 * Return 1 if found.
1154
 */
1155
int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
1156

    
1157
/**
1158
 * Returns in 'buf' the path with '%d' replaced by number.
1159
 *
1160
 * Also handles the '%0nd' format where 'n' is the total number
1161
 * of digits and '%%'.
1162
 *
1163
 * @param buf destination buffer
1164
 * @param buf_size destination buffer size
1165
 * @param path numbered sequence string
1166
 * @param number frame number
1167
 * @return 0 if OK, -1 on format error
1168
 */
1169
int av_get_frame_filename(char *buf, int buf_size,
1170
                          const char *path, int number);
1171

    
1172
/**
1173
 * Check whether filename actually is a numbered sequence generator.
1174
 *
1175
 * @param filename possible numbered sequence string
1176
 * @return 1 if a valid numbered sequence string, 0 otherwise
1177
 */
1178
int av_filename_number_test(const char *filename);
1179

    
1180
/**
1181
 * Generate an SDP for an RTP session.
1182
 *
1183
 * @param ac array of AVFormatContexts describing the RTP streams. If the
1184
 *           array is composed by only one context, such context can contain
1185
 *           multiple AVStreams (one AVStream per RTP stream). Otherwise,
1186
 *           all the contexts in the array (an AVCodecContext per RTP stream)
1187
 *           must contain only one AVStream.
1188
 * @param n_files number of AVCodecContexts contained in ac
1189
 * @param buff buffer where the SDP will be stored (must be allocated by
1190
 *             the caller)
1191
 * @param size the size of the buffer
1192
 * @return 0 if OK, AVERROR_xxx on error
1193
 */
1194
int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size);
1195

    
1196
#ifdef HAVE_AV_CONFIG_H
1197

    
1198
void ff_dynarray_add(unsigned long **tab_ptr, int *nb_ptr, unsigned long elem);
1199

    
1200
#ifdef __GNUC__
1201
#define dynarray_add(tab, nb_ptr, elem)\
1202
do {\
1203
    __typeof__(tab) _tab = (tab);\
1204
    __typeof__(elem) _elem = (elem);\
1205
    (void)sizeof(**_tab == _elem); /* check that types are compatible */\
1206
    ff_dynarray_add((unsigned long **)_tab, nb_ptr, (unsigned long)_elem);\
1207
} while(0)
1208
#else
1209
#define dynarray_add(tab, nb_ptr, elem)\
1210
do {\
1211
    ff_dynarray_add((unsigned long **)(tab), nb_ptr, (unsigned long)(elem));\
1212
} while(0)
1213
#endif
1214

    
1215
time_t mktimegm(struct tm *tm);
1216
struct tm *brktimegm(time_t secs, struct tm *tm);
1217
const char *small_strptime(const char *p, const char *fmt,
1218
                           struct tm *dt);
1219

    
1220
struct in_addr;
1221
int resolve_host(struct in_addr *sin_addr, const char *hostname);
1222

    
1223
void url_split(char *proto, int proto_size,
1224
               char *authorization, int authorization_size,
1225
               char *hostname, int hostname_size,
1226
               int *port_ptr,
1227
               char *path, int path_size,
1228
               const char *url);
1229

    
1230
int match_ext(const char *filename, const char *extensions);
1231

    
1232
#endif /* HAVE_AV_CONFIG_H */
1233

    
1234
#endif /* AVFORMAT_AVFORMAT_H */