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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 34
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#define LIBAVFORMAT_VERSION_MICRO  1
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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 639-2/B 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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/**
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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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/* 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 name. You 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 name. You 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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       @return 0 on success, < 0 on error.
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               When returning an error, pkt must not have been allocated
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               or must be freed before returning */
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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 {
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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.
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 * Removal, reordering and changes to existing fields require a major
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 * 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 */
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    int id;       /**< format-specific stream ID */
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    AVCodecContext *codec; /**< codec context */
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    /**
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     * Real base framerate of the stream.
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     * 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.
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     */
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    AVRational r_frame_rate;
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    void *priv_data;
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    /* internal data used in av_find_stream_info() */
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    int64_t first_dts;
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    /** encoding: pts generation when outputting stream */
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    struct AVFrac pts;
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    /**
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     * This is the fundamental unit of time (in seconds) in terms
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     * of which frame timestamps are represented. For fixed-fps content,
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     * time base should be 1/framerate and timestamp increments should be 1.
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     */
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    AVRational time_base;
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    int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
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    /* ffmpeg.c private use */
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    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.
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    //FIXME move stuff to a flags field?
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    /** Quality, as it has been removed from AVCodecContext and put in AVVideoFrame.
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     * MN: dunno if that is the right place for it */
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    float quality;
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    /**
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     * Decoding: pts of the first frame of the stream, in stream time base.
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     * Only set this if you are absolutely 100% sure that the value you set
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     * it to really is the pts of the first frame.
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     * This may be undefined (AV_NOPTS_VALUE).
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     * @note The ASF header does NOT contain a correct start_time the ASF
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     * demuxer must NOT set this.
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     */
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    int64_t start_time;
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    /**
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     * Decoding: duration of the stream, in stream time base.
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     * If a source file does not specify a duration, but does specify
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     * a bitrate, this value will be estimated from bitrate and file size.
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     */
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    int64_t duration;
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#if LIBAVFORMAT_VERSION_INT < (53<<16)
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    char language[4]; /** ISO 639-2/B 3-letter language code (empty string if undefined) */
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#endif
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    /* av_read_frame() support */
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    enum AVStreamParseType need_parsing;
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    struct AVCodecParserContext *parser;
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    int64_t cur_dts;
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    int last_IP_duration;
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    int64_t last_IP_pts;
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    /* av_seek_frame() support */
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    AVIndexEntry *index_entries; /**< Only used if the format does not
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                                    support seeking natively. */
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    int nb_index_entries;
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    unsigned int index_entries_allocated_size;
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    int64_t nb_frames;                 ///< number of frames in this stream if known or 0
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#if LIBAVFORMAT_VERSION_INT < (53<<16)
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    int64_t unused[4+1];
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    char *filename; /**< source filename of the stream */
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#endif
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    int disposition; /**< AV_DISPOSITION_* bit field */
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    AVProbeData probe_data;
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#define MAX_REORDER_DELAY 16
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    int64_t pts_buffer[MAX_REORDER_DELAY+1];
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    /**
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     * sample aspect ratio (0 if unknown)
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     * - encoding: Set by user.
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     * - decoding: Set by libavformat.
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     */
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    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;
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    int cur_len;
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    AVPacket cur_pkt;
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    // Timestamp generation support:
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    /**
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     * Timestamp corresponding to the last dts sync point.
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     *
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     * Initialized when AVCodecParserContext.dts_sync_point >= 0 and
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     * a DTS is received from the underlying container. Otherwise set to
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     * AV_NOPTS_VALUE by default.
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     */
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    int64_t reference_dts;
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    /**
448
     * Number of packets to buffer for codec probing
449
     * NOT PART OF PUBLIC API
450
     */
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#define MAX_PROBE_PACKETS 100
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    int probe_packets;
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} AVStream;
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#define AV_PROGRAM_RUNNING 1
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/**
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 * New fields can be added to the end with minor version bumps.
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 * Removal, reordering and changes to existing fields require a major
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 * version bump.
461
 * sizeof(AVProgram) must not be used outside libav*.
462
 */
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typedef struct AVProgram {
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    int            id;
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#if LIBAVFORMAT_VERSION_INT < (53<<16)
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    char           *provider_name; ///< network name for DVB streams
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    char           *name;          ///< service name for DVB streams
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#endif
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    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;
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    AVMetadata *metadata;
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} AVProgram;
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#define AVFMTCTX_NOHEADER      0x0001 /**< signal that no header is present
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                                         (streams are added dynamically) */
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479
typedef struct AVChapter {
480
    int id;                 ///< unique ID to identify the chapter
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    AVRational time_base;   ///< time base in which the start/end timestamps are specified
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    int64_t start, end;     ///< chapter start/end time in time_base units
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#if LIBAVFORMAT_VERSION_INT < (53<<16)
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    char *title;            ///< chapter title
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#endif
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    AVMetadata *metadata;
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} AVChapter;
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#define MAX_STREAMS 20
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/**
492
 * Format I/O context.
493
 * New fields can be added to the end with minor version bumps.
494
 * Removal, reordering and changes to existing fields require a major
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 * version bump.
496
 * sizeof(AVFormatContext) must not be used outside libav*.
497
 */
498
typedef struct AVFormatContext {
499
    const AVClass *av_class; /**< Set by avformat_alloc_context. */
500
    /* Can only be iformat or oformat, not both at the same time. */
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    struct AVInputFormat *iformat;
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    struct AVOutputFormat *oformat;
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    void *priv_data;
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    ByteIOContext *pb;
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    unsigned int nb_streams;
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    AVStream *streams[MAX_STREAMS];
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    char filename[1024]; /**< input or output filename */
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    /* stream info */
509
    int64_t timestamp;
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#if LIBAVFORMAT_VERSION_INT < (53<<16)
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    char title[512];
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    char author[512];
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    char copyright[512];
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    char comment[512];
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    char album[512];
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    int year;  /**< ID3 year, 0 if none */
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    int track; /**< track number, 0 if none */
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    char genre[32]; /**< ID3 genre */
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#endif
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    int ctx_flags; /**< Format-specific flags, see AVFMTCTX_xx */
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    /* private data for pts handling (do not modify directly). */
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    /** This buffer is only needed when packets were already buffered but
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       not decoded, for example to get the codec parameters in MPEG
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       streams. */
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    struct AVPacketList *packet_buffer;
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    /** Decoding: position of the first frame of the component, in
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       AV_TIME_BASE fractional seconds. NEVER set this value directly:
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       It is deduced from the AVStream values.  */
531
    int64_t start_time;
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    /** Decoding: duration of the stream, in AV_TIME_BASE fractional
533
       seconds. NEVER set this value directly: it is deduced from the
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       AVStream values.  */
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    int64_t duration;
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    /** decoding: total file size, 0 if unknown */
537
    int64_t file_size;
538
    /** Decoding: total stream bitrate in bit/s, 0 if not
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       available. Never set it directly if the file_size and the
540
       duration are known as FFmpeg can compute it automatically. */
541
    int bit_rate;
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    /* av_read_frame() support */
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    AVStream *cur_st;
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#if LIBAVFORMAT_VERSION_INT < (53<<16)
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    const uint8_t *cur_ptr_deprecated;
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    int cur_len_deprecated;
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    AVPacket cur_pkt_deprecated;
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#endif
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    /* av_seek_frame() support */
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    int64_t data_offset; /** offset of the first packet */
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    int index_built;
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    int mux_rate;
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    unsigned int packet_size;
557
    int preload;
558
    int max_delay;
559

    
560
#define AVFMT_NOOUTPUTLOOP -1
561
#define AVFMT_INFINITEOUTPUTLOOP 0
562
    /** number of times to loop output in formats that support it */
563
    int loop_output;
564

    
565
    int flags;
566
#define AVFMT_FLAG_GENPTS       0x0001 ///< Generate missing pts even if it requires parsing future frames.
567
#define AVFMT_FLAG_IGNIDX       0x0002 ///< Ignore index.
568
#define AVFMT_FLAG_NONBLOCK     0x0004 ///< Do not block when reading packets from input.
569

    
570
    int loop_input;
571
    /** decoding: size of data to probe; encoding: unused. */
572
    unsigned int probesize;
573

    
574
    /**
575
     * Maximum time (in AV_TIME_BASE units) during which the input should
576
     * be analyzed in av_find_stream_info().
577
     */
578
    int max_analyze_duration;
579

    
580
    const uint8_t *key;
581
    int keylen;
582

    
583
    unsigned int nb_programs;
584
    AVProgram **programs;
585

    
586
    /**
587
     * Forced video codec_id.
588
     * Demuxing: Set by user.
589
     */
590
    enum CodecID video_codec_id;
591
    /**
592
     * Forced audio codec_id.
593
     * Demuxing: Set by user.
594
     */
595
    enum CodecID audio_codec_id;
596
    /**
597
     * Forced subtitle codec_id.
598
     * Demuxing: Set by user.
599
     */
600
    enum CodecID subtitle_codec_id;
601

    
602
    /**
603
     * Maximum amount of memory in bytes to use for the index of each stream.
604
     * If the index exceeds this size, entries will be discarded as
605
     * needed to maintain a smaller size. This can lead to slower or less
606
     * accurate seeking (depends on demuxer).
607
     * Demuxers for which a full in-memory index is mandatory will ignore
608
     * this.
609
     * muxing  : unused
610
     * demuxing: set by user
611
     */
612
    unsigned int max_index_size;
613

    
614
    /**
615
     * Maximum amount of memory in bytes to use for buffering frames
616
     * obtained from realtime capture devices.
617
     */
618
    unsigned int max_picture_buffer;
619

    
620
    unsigned int nb_chapters;
621
    AVChapter **chapters;
622

    
623
    /**
624
     * Flags to enable debugging.
625
     */
626
    int debug;
627
#define FF_FDEBUG_TS        0x0001
628

    
629
    /**
630
     * Raw packets from the demuxer, prior to parsing and decoding.
631
     * This buffer is used for buffering packets until the codec can
632
     * be identified, as parsing cannot be done without knowing the
633
     * codec.
634
     */
635
    struct AVPacketList *raw_packet_buffer;
636
    struct AVPacketList *raw_packet_buffer_end;
637

    
638
    struct AVPacketList *packet_buffer_end;
639

    
640
    AVMetadata *metadata;
641
} AVFormatContext;
642

    
643
typedef struct AVPacketList {
644
    AVPacket pkt;
645
    struct AVPacketList *next;
646
} AVPacketList;
647

    
648
#if LIBAVFORMAT_VERSION_INT < (53<<16)
649
extern AVInputFormat *first_iformat;
650
extern AVOutputFormat *first_oformat;
651
#endif
652

    
653
/**
654
 * If f is NULL, returns the first registered input format,
655
 * if f is non-NULL, returns the next registered input format after f
656
 * or NULL if f is the last one.
657
 */
658
AVInputFormat  *av_iformat_next(AVInputFormat  *f);
659

    
660
/**
661
 * If f is NULL, returns the first registered output format,
662
 * if f is non-NULL, returns the next registered output format after f
663
 * or NULL if f is the last one.
664
 */
665
AVOutputFormat *av_oformat_next(AVOutputFormat *f);
666

    
667
enum CodecID av_guess_image2_codec(const char *filename);
668

    
669
/* XXX: Use automatic init with either ELF sections or C file parser */
670
/* modules. */
671

    
672
/* utils.c */
673
void av_register_input_format(AVInputFormat *format);
674
void av_register_output_format(AVOutputFormat *format);
675
AVOutputFormat *guess_stream_format(const char *short_name,
676
                                    const char *filename,
677
                                    const char *mime_type);
678
AVOutputFormat *guess_format(const char *short_name,
679
                             const char *filename,
680
                             const char *mime_type);
681

    
682
/**
683
 * Guesses the codec ID based upon muxer and filename.
684
 */
685
enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
686
                            const char *filename, const char *mime_type,
687
                            enum CodecType type);
688

    
689
/**
690
 * Send a nice hexadecimal dump of a buffer to the specified file stream.
691
 *
692
 * @param f The file stream pointer where the dump should be sent to.
693
 * @param buf buffer
694
 * @param size buffer size
695
 *
696
 * @see av_hex_dump_log, av_pkt_dump, av_pkt_dump_log
697
 */
698
void av_hex_dump(FILE *f, uint8_t *buf, int size);
699

    
700
/**
701
 * Send a nice hexadecimal dump of a buffer to the log.
702
 *
703
 * @param avcl A pointer to an arbitrary struct of which the first field is a
704
 * pointer to an AVClass struct.
705
 * @param level The importance level of the message, lower values signifying
706
 * higher importance.
707
 * @param buf buffer
708
 * @param size buffer size
709
 *
710
 * @see av_hex_dump, av_pkt_dump, av_pkt_dump_log
711
 */
712
void av_hex_dump_log(void *avcl, int level, uint8_t *buf, int size);
713

    
714
/**
715
 * Send a nice dump of a packet to the specified file stream.
716
 *
717
 * @param f The file stream pointer where the dump should be sent to.
718
 * @param pkt packet to dump
719
 * @param dump_payload True if the payload must be displayed, too.
720
 */
721
void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
722

    
723
/**
724
 * Send a nice dump of a packet to the log.
725
 *
726
 * @param avcl A pointer to an arbitrary struct of which the first field is a
727
 * pointer to an AVClass struct.
728
 * @param level The importance level of the message, lower values signifying
729
 * higher importance.
730
 * @param pkt packet to dump
731
 * @param dump_payload True if the payload must be displayed, too.
732
 */
733
void av_pkt_dump_log(void *avcl, int level, AVPacket *pkt, int dump_payload);
734

    
735
/**
736
 * Initialize libavformat and register all the muxers, demuxers and
737
 * protocols. If you do not call this function, then you can select
738
 * exactly which formats you want to support.
739
 *
740
 * @see av_register_input_format()
741
 * @see av_register_output_format()
742
 * @see av_register_protocol()
743
 */
744
void av_register_all(void);
745

    
746
/** codec tag <-> codec id */
747
enum CodecID av_codec_get_id(const struct AVCodecTag * const *tags, unsigned int tag);
748
unsigned int av_codec_get_tag(const struct AVCodecTag * const *tags, enum CodecID id);
749

    
750
/* media file input */
751

    
752
/**
753
 * Finds AVInputFormat based on the short name of the input format.
754
 */
755
AVInputFormat *av_find_input_format(const char *short_name);
756

    
757
/**
758
 * Guess file format.
759
 *
760
 * @param is_opened Whether the file is already opened; determines whether
761
 *                  demuxers with or without AVFMT_NOFILE are probed.
762
 */
763
AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
764

    
765
/**
766
 * Allocates all the structures needed to read an input stream.
767
 *        This does not open the needed codecs for decoding the stream[s].
768
 */
769
int av_open_input_stream(AVFormatContext **ic_ptr,
770
                         ByteIOContext *pb, const char *filename,
771
                         AVInputFormat *fmt, AVFormatParameters *ap);
772

    
773
/**
774
 * Open a media file as input. The codecs are not opened. Only the file
775
 * header (if present) is read.
776
 *
777
 * @param ic_ptr The opened media file handle is put here.
778
 * @param filename filename to open
779
 * @param fmt If non-NULL, force the file format to use.
780
 * @param buf_size optional buffer size (zero if default is OK)
781
 * @param ap Additional parameters needed when opening the file
782
 *           (NULL if default).
783
 * @return 0 if OK, AVERROR_xxx otherwise
784
 */
785
int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
786
                       AVInputFormat *fmt,
787
                       int buf_size,
788
                       AVFormatParameters *ap);
789

    
790
#if LIBAVFORMAT_VERSION_MAJOR < 53
791
/**
792
 * @deprecated Use avformat_alloc_context() instead.
793
 */
794
attribute_deprecated AVFormatContext *av_alloc_format_context(void);
795
#endif
796

    
797
/**
798
 * Allocate an AVFormatContext.
799
 * Can be freed with av_free() but do not forget to free everything you
800
 * explicitly allocated as well!
801
 */
802
AVFormatContext *avformat_alloc_context(void);
803

    
804
/**
805
 * Read packets of a media file to get stream information. This
806
 * is useful for file formats with no headers such as MPEG. This
807
 * function also computes the real framerate in case of MPEG-2 repeat
808
 * frame mode.
809
 * The logical file position is not changed by this function;
810
 * examined packets may be buffered for later processing.
811
 *
812
 * @param ic media file handle
813
 * @return >=0 if OK, AVERROR_xxx on error
814
 * @todo Let the user decide somehow what information is needed so that
815
 *       we do not waste time getting stuff the user does not need.
816
 */
817
int av_find_stream_info(AVFormatContext *ic);
818

    
819
/**
820
 * Read a transport packet from a media file.
821
 *
822
 * This function is obsolete and should never be used.
823
 * Use av_read_frame() instead.
824
 *
825
 * @param s media file handle
826
 * @param pkt is filled
827
 * @return 0 if OK, AVERROR_xxx on error
828
 */
829
int av_read_packet(AVFormatContext *s, AVPacket *pkt);
830

    
831
/**
832
 * Return the next frame of a stream.
833
 *
834
 * The returned packet is valid
835
 * until the next av_read_frame() or until av_close_input_file() and
836
 * must be freed with av_free_packet. For video, the packet contains
837
 * exactly one frame. For audio, it contains an integer number of
838
 * frames if each frame has a known fixed size (e.g. PCM or ADPCM
839
 * data). If the audio frames have a variable size (e.g. MPEG audio),
840
 * then it contains one frame.
841
 *
842
 * pkt->pts, pkt->dts and pkt->duration are always set to correct
843
 * values in AVStream.time_base units (and guessed if the format cannot
844
 * provide them). pkt->pts can be AV_NOPTS_VALUE if the video format
845
 * has B-frames, so it is better to rely on pkt->dts if you do not
846
 * decompress the payload.
847
 *
848
 * @return 0 if OK, < 0 on error or end of file
849
 */
850
int av_read_frame(AVFormatContext *s, AVPacket *pkt);
851

    
852
/**
853
 * Seek to the keyframe at timestamp.
854
 * 'timestamp' in 'stream_index'.
855
 * @param stream_index If stream_index is (-1), a default
856
 * stream is selected, and timestamp is automatically converted
857
 * from AV_TIME_BASE units to the stream specific time_base.
858
 * @param timestamp Timestamp in AVStream.time_base units
859
 *        or, if no stream is specified, in AV_TIME_BASE units.
860
 * @param flags flags which select direction and seeking mode
861
 * @return >= 0 on success
862
 */
863
int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp,
864
                  int flags);
865

    
866
/**
867
 * Seek to timestamp ts.
868
 * Seeking will be done so that the point from which all active streams
869
 * can be presented successfully will be closest to ts and within min/max_ts.
870
 * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
871
 *
872
 * If flags contain AVSEEK_FLAG_BYTE, then all timestamps are in bytes and
873
 * are the file position (this may not be supported by all demuxers).
874
 * If flags contain AVSEEK_FLAG_FRAME, then all timestamps are in frames
875
 * in the stream with stream_index (this may not be supported by all demuxers).
876
 * Otherwise all timestamps are in units of the stream selected by stream_index
877
 * or if stream_index is -1, in AV_TIME_BASE units.
878
 * If flags contain AVSEEK_FLAG_ANY, then non-keyframes are treated as
879
 * keyframes (this may not be supported by all demuxers).
880
 *
881
 * @param stream_index index of the stream which is used as time base reference
882
 * @param min_ts smallest acceptable timestamp
883
 * @param ts target timestamp
884
 * @param max_ts largest acceptable timestamp
885
 * @param flags flags
886
 * @returns >=0 on success, error code otherwise
887
 *
888
 * @NOTE This is part of the new seek API which is still under construction.
889
 *       Thus do not use this yet. It may change at any time, do not expect
890
 *       ABI compatibility yet!
891
 */
892
int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
893

    
894
/**
895
 * Start playing a network-based stream (e.g. RTSP stream) at the
896
 * current position.
897
 */
898
int av_read_play(AVFormatContext *s);
899

    
900
/**
901
 * Pause a network-based stream (e.g. RTSP stream).
902
 *
903
 * Use av_read_play() to resume it.
904
 */
905
int av_read_pause(AVFormatContext *s);
906

    
907
/**
908
 * Free a AVFormatContext allocated by av_open_input_stream.
909
 * @param s context to free
910
 */
911
void av_close_input_stream(AVFormatContext *s);
912

    
913
/**
914
 * Close a media file (but not its codecs).
915
 *
916
 * @param s media file handle
917
 */
918
void av_close_input_file(AVFormatContext *s);
919

    
920
/**
921
 * Add a new stream to a media file.
922
 *
923
 * Can only be called in the read_header() function. If the flag
924
 * AVFMTCTX_NOHEADER is in the format context, then new streams
925
 * can be added in read_packet too.
926
 *
927
 * @param s media file handle
928
 * @param id file-format-dependent stream ID
929
 */
930
AVStream *av_new_stream(AVFormatContext *s, int id);
931
AVProgram *av_new_program(AVFormatContext *s, int id);
932

    
933
/**
934
 * Add a new chapter.
935
 * This function is NOT part of the public API
936
 * and should ONLY be used by demuxers.
937
 *
938
 * @param s media file handle
939
 * @param id unique ID for this chapter
940
 * @param start chapter start time in time_base units
941
 * @param end chapter end time in time_base units
942
 * @param title chapter title
943
 *
944
 * @return AVChapter or NULL on error
945
 */
946
AVChapter *ff_new_chapter(AVFormatContext *s, int id, AVRational time_base,
947
                          int64_t start, int64_t end, const char *title);
948

    
949
/**
950
 * Set the pts for a given stream.
951
 *
952
 * @param s stream
953
 * @param pts_wrap_bits number of bits effectively used by the pts
954
 *        (used for wrap control, 33 is the value for MPEG)
955
 * @param pts_num numerator to convert to seconds (MPEG: 1)
956
 * @param pts_den denominator to convert to seconds (MPEG: 90000)
957
 */
958
void av_set_pts_info(AVStream *s, int pts_wrap_bits,
959
                     int pts_num, int pts_den);
960

    
961
#define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
962
#define AVSEEK_FLAG_BYTE     2 ///< seeking based on position in bytes
963
#define AVSEEK_FLAG_ANY      4 ///< seek to any frame, even non-keyframes
964

    
965
int av_find_default_stream_index(AVFormatContext *s);
966

    
967
/**
968
 * Gets the index for a specific timestamp.
969
 * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond
970
 *                 to the timestamp which is <= the requested one, if backward
971
 *                 is 0, then it will be >=
972
 *              if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
973
 * @return < 0 if no such timestamp could be found
974
 */
975
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
976

    
977
/**
978
 * Ensures the index uses less memory than the maximum specified in
979
 * AVFormatContext.max_index_size by discarding entries if it grows
980
 * too large.
981
 * This function is not part of the public API and should only be called
982
 * by demuxers.
983
 */
984
void ff_reduce_index(AVFormatContext *s, int stream_index);
985

    
986
/**
987
 * Add an index entry into a sorted list. Update the entry if the list
988
 * already contains it.
989
 *
990
 * @param timestamp timestamp in the time base of the given stream
991
 */
992
int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp,
993
                       int size, int distance, int flags);
994

    
995
/**
996
 * Does a binary search using av_index_search_timestamp() and
997
 * AVCodec.read_timestamp().
998
 * This is not supposed to be called directly by a user application,
999
 * but by demuxers.
1000
 * @param target_ts target timestamp in the time base of the given stream
1001
 * @param stream_index stream number
1002
 */
1003
int av_seek_frame_binary(AVFormatContext *s, int stream_index,
1004
                         int64_t target_ts, int flags);
1005

    
1006
/**
1007
 * Updates cur_dts of all streams based on the given timestamp and AVStream.
1008
 *
1009
 * Stream ref_st unchanged, others set cur_dts in their native time base.
1010
 * Only needed for timestamp wrapping or if (dts not set and pts!=dts).
1011
 * @param timestamp new dts expressed in time_base of param ref_st
1012
 * @param ref_st reference stream giving time_base of param timestamp
1013
 */
1014
void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
1015

    
1016
/**
1017
 * Does a binary search using read_timestamp().
1018
 * This is not supposed to be called directly by a user application,
1019
 * but by demuxers.
1020
 * @param target_ts target timestamp in the time base of the given stream
1021
 * @param stream_index stream number
1022
 */
1023
int64_t av_gen_search(AVFormatContext *s, int stream_index,
1024
                      int64_t target_ts, int64_t pos_min,
1025
                      int64_t pos_max, int64_t pos_limit,
1026
                      int64_t ts_min, int64_t ts_max,
1027
                      int flags, int64_t *ts_ret,
1028
                      int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
1029

    
1030
/** media file output */
1031
int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
1032

    
1033
/**
1034
 * Allocate the stream private data and write the stream header to an
1035
 * output media file.
1036
 *
1037
 * @param s media file handle
1038
 * @return 0 if OK, AVERROR_xxx on error
1039
 */
1040
int av_write_header(AVFormatContext *s);
1041

    
1042
/**
1043
 * Write a packet to an output media file.
1044
 *
1045
 * The packet shall contain one audio or video frame.
1046
 * The packet must be correctly interleaved according to the container
1047
 * specification, if not then av_interleaved_write_frame must be used.
1048
 *
1049
 * @param s media file handle
1050
 * @param pkt The packet, which contains the stream_index, buf/buf_size,
1051
              dts/pts, ...
1052
 * @return < 0 on error, = 0 if OK, 1 if end of stream wanted
1053
 */
1054
int av_write_frame(AVFormatContext *s, AVPacket *pkt);
1055

    
1056
/**
1057
 * Writes a packet to an output media file ensuring correct interleaving.
1058
 *
1059
 * The packet must contain one audio or video frame.
1060
 * If the packets are already correctly interleaved, the application should
1061
 * call av_write_frame() instead as it is slightly faster. It is also important
1062
 * to keep in mind that completely non-interleaved input will need huge amounts
1063
 * of memory to interleave with this, so it is preferable to interleave at the
1064
 * demuxer level.
1065
 *
1066
 * @param s media file handle
1067
 * @param pkt The packet, which contains the stream_index, buf/buf_size,
1068
              dts/pts, ...
1069
 * @return < 0 on error, = 0 if OK, 1 if end of stream wanted
1070
 */
1071
int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
1072

    
1073
/**
1074
 * Interleave a packet per dts in an output media file.
1075
 *
1076
 * Packets with pkt->destruct == av_destruct_packet will be freed inside this
1077
 * function, so they cannot be used after it. Note that calling av_free_packet()
1078
 * on them is still safe.
1079
 *
1080
 * @param s media file handle
1081
 * @param out the interleaved packet will be output here
1082
 * @param in the input packet
1083
 * @param flush 1 if no further packets are available as input and all
1084
 *              remaining packets should be output
1085
 * @return 1 if a packet was output, 0 if no packet could be output,
1086
 *         < 0 if an error occurred
1087
 */
1088
int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
1089
                                 AVPacket *pkt, int flush);
1090

    
1091
/**
1092
 * @brief Write the stream trailer to an output media file and
1093
 *        free the file private data.
1094
 *
1095
 * May only be called after a successful call to av_write_header.
1096
 *
1097
 * @param s media file handle
1098
 * @return 0 if OK, AVERROR_xxx on error
1099
 */
1100
int av_write_trailer(AVFormatContext *s);
1101

    
1102
void dump_format(AVFormatContext *ic,
1103
                 int index,
1104
                 const char *url,
1105
                 int is_output);
1106

    
1107
#if LIBAVFORMAT_VERSION_MAJOR < 53
1108
/**
1109
 * Parses width and height out of string str.
1110
 * @deprecated Use av_parse_video_frame_size instead.
1111
 */
1112
attribute_deprecated int parse_image_size(int *width_ptr, int *height_ptr,
1113
                                          const char *str);
1114

    
1115
/**
1116
 * Converts framerate from a string to a fraction.
1117
 * @deprecated Use av_parse_video_frame_rate instead.
1118
 */
1119
attribute_deprecated int parse_frame_rate(int *frame_rate, int *frame_rate_base,
1120
                                          const char *arg);
1121
#endif
1122

    
1123
/**
1124
 * Parses datestr and returns a corresponding number of microseconds.
1125
 * @param datestr String representing a date or a duration.
1126
 * - If a date the syntax is:
1127
 * @code
1128
 *  [{YYYY-MM-DD|YYYYMMDD}]{T| }{HH[:MM[:SS[.m...]]][Z]|HH[MM[SS[.m...]]][Z]}
1129
 * @endcode
1130
 * Time is local time unless Z is appended, in which case it is
1131
 * interpreted as UTC.
1132
 * If the year-month-day part is not specified it takes the current
1133
 * year-month-day.
1134
 * Returns the number of microseconds since 1st of January, 1970 up to
1135
 * the time of the parsed date or INT64_MIN if datestr cannot be
1136
 * successfully parsed.
1137
 * - If a duration the syntax is:
1138
 * @code
1139
 *  [-]HH[:MM[:SS[.m...]]]
1140
 *  [-]S+[.m...]
1141
 * @endcode
1142
 * Returns the number of microseconds contained in a time interval
1143
 * with the specified duration or INT64_MIN if datestr cannot be
1144
 * successfully parsed.
1145
 * @param duration Flag which tells how to interpret datestr, if
1146
 * not zero datestr is interpreted as a duration, otherwise as a
1147
 * date.
1148
 */
1149
int64_t parse_date(const char *datestr, int duration);
1150

    
1151
/** Gets the current time in microseconds. */
1152
int64_t av_gettime(void);
1153

    
1154
/* ffm-specific for ffserver */
1155
#define FFM_PACKET_SIZE 4096
1156
int64_t ffm_read_write_index(int fd);
1157
int ffm_write_write_index(int fd, int64_t pos);
1158
void ffm_set_write_index(AVFormatContext *s, int64_t pos, int64_t file_size);
1159

    
1160
/**
1161
 * Attempts to find a specific tag in a URL.
1162
 *
1163
 * syntax: '?tag1=val1&tag2=val2...'. Little URL decoding is done.
1164
 * Return 1 if found.
1165
 */
1166
int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
1167

    
1168
/**
1169
 * Returns in 'buf' the path with '%d' replaced by a number.
1170
 *
1171
 * Also handles the '%0nd' format where 'n' is the total number
1172
 * of digits and '%%'.
1173
 *
1174
 * @param buf destination buffer
1175
 * @param buf_size destination buffer size
1176
 * @param path numbered sequence string
1177
 * @param number frame number
1178
 * @return 0 if OK, -1 on format error
1179
 */
1180
int av_get_frame_filename(char *buf, int buf_size,
1181
                          const char *path, int number);
1182

    
1183
/**
1184
 * Check whether filename actually is a numbered sequence generator.
1185
 *
1186
 * @param filename possible numbered sequence string
1187
 * @return 1 if a valid numbered sequence string, 0 otherwise
1188
 */
1189
int av_filename_number_test(const char *filename);
1190

    
1191
/**
1192
 * Generate an SDP for an RTP session.
1193
 *
1194
 * @param ac array of AVFormatContexts describing the RTP streams. If the
1195
 *           array is composed by only one context, such context can contain
1196
 *           multiple AVStreams (one AVStream per RTP stream). Otherwise,
1197
 *           all the contexts in the array (an AVCodecContext per RTP stream)
1198
 *           must contain only one AVStream.
1199
 * @param n_files number of AVCodecContexts contained in ac
1200
 * @param buff buffer where the SDP will be stored (must be allocated by
1201
 *             the caller)
1202
 * @param size the size of the buffer
1203
 * @return 0 if OK, AVERROR_xxx on error
1204
 */
1205
int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size);
1206

    
1207
#ifdef HAVE_AV_CONFIG_H
1208

    
1209
void ff_dynarray_add(intptr_t **tab_ptr, int *nb_ptr, intptr_t elem);
1210

    
1211
#ifdef __GNUC__
1212
#define dynarray_add(tab, nb_ptr, elem)\
1213
do {\
1214
    __typeof__(tab) _tab = (tab);\
1215
    __typeof__(elem) _elem = (elem);\
1216
    (void)sizeof(**_tab == _elem); /* check that types are compatible */\
1217
    ff_dynarray_add((intptr_t **)_tab, nb_ptr, (intptr_t)_elem);\
1218
} while(0)
1219
#else
1220
#define dynarray_add(tab, nb_ptr, elem)\
1221
do {\
1222
    ff_dynarray_add((intptr_t **)(tab), nb_ptr, (intptr_t)(elem));\
1223
} while(0)
1224
#endif
1225

    
1226
time_t mktimegm(struct tm *tm);
1227
struct tm *brktimegm(time_t secs, struct tm *tm);
1228
const char *small_strptime(const char *p, const char *fmt,
1229
                           struct tm *dt);
1230

    
1231
struct in_addr;
1232
int resolve_host(struct in_addr *sin_addr, const char *hostname);
1233

    
1234
void url_split(char *proto, int proto_size,
1235
               char *authorization, int authorization_size,
1236
               char *hostname, int hostname_size,
1237
               int *port_ptr,
1238
               char *path, int path_size,
1239
               const char *url);
1240

    
1241
/**
1242
 * Returns a positive value if the given filename has one of the given
1243
 * extensions, 0 otherwise.
1244
 *
1245
 * @param extensions a comma-separated list of filename extensions
1246
 */
1247
int match_ext(const char *filename, const char *extensions);
1248

    
1249
#endif /* HAVE_AV_CONFIG_H */
1250

    
1251
#endif /* AVFORMAT_AVFORMAT_H */