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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 FFMPEG_AVFORMAT_H
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#define FFMPEG_AVFORMAT_H
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#define LIBAVFORMAT_VERSION_MAJOR 52
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#define LIBAVFORMAT_VERSION_MINOR 15
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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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#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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/* packet functions */
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typedef struct AVPacket {
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    /**
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     * Presentation time stamp 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 can not 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 time stamp 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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    int   duration;                         ///< presentation duration in time_base units (0 if not available)
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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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} 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 to 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 to 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 to 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 (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 such as 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 attribute_deprecated;
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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               ///< max 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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    int mpeg2ts_raw:1;  /**< force raw MPEG2 transport stream output, if possible */
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    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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    int initial_pause:1;       /**< do not begin to play the stream
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                                  immediately (RTSP only) */
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    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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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, AVPacket *in, int flush);
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    /**
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     * list of supported codec_id-codec_tag pairs, ordered by "better choice first"
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     * the arrays are all CODEC_ID_NONE terminated
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     */
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    const struct AVCodecTag **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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     */
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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 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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     */
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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 paramters. Only used in raw format right
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       now. 'av_new_stream' should be called to create new streams.  */
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    int (*read_header)(struct AVFormatContext *,
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                       AVFormatParameters *ap);
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    /** read one packet and put it in 'pkt'. pts and flags are also
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       set. 'av_new_stream' can be called only if the flag
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       AVFMTCTX_NOHEADER is used. */
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    int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
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    /** close the stream. The AVFormatContext and AVStreams are not
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       freed by this function */
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    int (*read_close)(struct AVFormatContext *);
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    /**
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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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    /**
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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 **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, don't repack */
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    AVSTREAM_PARSE_TIMESTAMPS, /**< full parsing and interpolation of timestamps for frames not starting on 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 byte due to possible 8byte align).
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    int min_distance;         /**< min 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 frame rate of the stream.
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     * This is the lowest frame rate with which all timestamps can be
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     * 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 timebase 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 outputing 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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     * timebase should be 1/frame rate and timestamp increments should be
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     * identically 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 estimates from bit rate and file size.
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     */
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    int64_t duration;
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    char language[4]; /** ISO 639 3-letter language code (empty string if undefined) */
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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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#define MAX_REORDER_DELAY 4
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    int64_t pts_buffer[MAX_REORDER_DELAY+1];
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    char *filename; /**< source filename of the stream */
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    int disposition; /**< AV_DISPOSITION_* bitfield */
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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.
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 * sizeof(AVProgram) must not be used outside libav*.
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 */
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typedef struct AVProgram {
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    int            id;
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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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    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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} 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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typedef struct AVChapter {
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    int id;                 ///< Unique id to identify the chapter
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    AVRational time_base;   ///< Timebase 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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    char *title;            ///< chapter title
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} AVChapter;
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#define MAX_STREAMS 20
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/**
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 * format I/O context.
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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.
431
 * sizeof(AVFormatContext) must not be used outside libav*.
432
 */
433
typedef struct AVFormatContext {
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    const AVClass *av_class; /**< set by av_alloc_format_context */
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    /* 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 */
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    int64_t timestamp;
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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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    int ctx_flags; /**< format specific flags, see AVFMTCTX_xx */
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    /* private data for pts handling (do not modify directly) */
456
    /** This buffer is only needed when packets were already buffered but
457
       not decoded, for example to get the codec parameters in mpeg
458
       streams */
459
    struct AVPacketList *packet_buffer;
460

    
461
    /** decoding: position of the first frame of the component, in
462
       AV_TIME_BASE fractional seconds. NEVER set this value directly:
463
       it is deduced from the AVStream values.  */
464
    int64_t start_time;
465
    /** decoding: duration of the stream, in AV_TIME_BASE fractional
466
       seconds. NEVER set this value directly: it is deduced from the
467
       AVStream values.  */
468
    int64_t duration;
469
    /** decoding: total file size. 0 if unknown */
470
    int64_t file_size;
471
    /** decoding: total stream bitrate in bit/s, 0 if not
472
       available. Never set it directly if the file_size and the
473
       duration are known as ffmpeg can compute it automatically. */
474
    int bit_rate;
475

    
476
    /* av_read_frame() support */
477
    AVStream *cur_st;
478
    const uint8_t *cur_ptr;
479
    int cur_len;
480
    AVPacket cur_pkt;
481

    
482
    /* av_seek_frame() support */
483
    int64_t data_offset; /** offset of the first packet */
484
    int index_built;
485

    
486
    int mux_rate;
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    int packet_size;
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    int preload;
489
    int max_delay;
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491
#define AVFMT_NOOUTPUTLOOP -1
492
#define AVFMT_INFINITEOUTPUTLOOP 0
493
    /** number of times to loop output in formats that support it */
494
    int loop_output;
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496
    int flags;
497
#define AVFMT_FLAG_GENPTS       0x0001 ///< generate pts if missing even if it requires parsing future frames
498
#define AVFMT_FLAG_IGNIDX       0x0002 ///< ignore index
499
#define AVFMT_FLAG_NONBLOCK     0x0004 ///< do not block when reading packets from input
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501
    int loop_input;
502
    /** decoding: size of data to probe; encoding unused */
503
    unsigned int probesize;
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505
    /**
506
     * maximum duration in AV_TIME_BASE units over which the input should be analyzed in av_find_stream_info()
507
     */
508
    int max_analyze_duration;
509

    
510
    const uint8_t *key;
511
    int keylen;
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513
    unsigned int nb_programs;
514
    AVProgram **programs;
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    /**
517
     * Forced video codec_id.
518
     * demuxing: set by user
519
     */
520
    enum CodecID video_codec_id;
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    /**
522
     * Forced audio codec_id.
523
     * demuxing: set by user
524
     */
525
    enum CodecID audio_codec_id;
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    /**
527
     * Forced subtitle codec_id.
528
     * demuxing: set by user
529
     */
530
    enum CodecID subtitle_codec_id;
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532
    /**
533
     * Maximum amount of memory in bytes to use per stream for the index.
534
     * If the needed index exceeds this size entries will be discarded as
535
     * needed to maintain a smaller size. This can lead to slower or less
536
     * accurate seeking (depends on demuxer).
537
     * Demuxers for which a full in memory index is mandatory will ignore
538
     * this.
539
     * muxing  : unused
540
     * demuxing: set by user
541
     */
542
    unsigned int max_index_size;
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544
    /**
545
     * Maximum amount of memory in bytes to use for buffering frames
546
     * obtained from real-time capture devices.
547
     */
548
    unsigned int max_picture_buffer;
549

    
550
    unsigned int nb_chapters;
551
    AVChapter **chapters;
552
} AVFormatContext;
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typedef struct AVPacketList {
555
    AVPacket pkt;
556
    struct AVPacketList *next;
557
} AVPacketList;
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#if LIBAVFORMAT_VERSION_INT < (53<<16)
560
extern AVInputFormat *first_iformat;
561
extern AVOutputFormat *first_oformat;
562
#endif
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564
AVInputFormat  *av_iformat_next(AVInputFormat  *f);
565
AVOutputFormat *av_oformat_next(AVOutputFormat *f);
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567
enum CodecID av_guess_image2_codec(const char *filename);
568

    
569
/* XXX: use automatic init with either ELF sections or C file parser */
570
/* modules */
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/* utils.c */
573
void av_register_input_format(AVInputFormat *format);
574
void av_register_output_format(AVOutputFormat *format);
575
AVOutputFormat *guess_stream_format(const char *short_name,
576
                                    const char *filename, const char *mime_type);
577
AVOutputFormat *guess_format(const char *short_name,
578
                             const char *filename, const char *mime_type);
579

    
580
/**
581
 * Guesses the codec id based upon muxer and filename.
582
 */
583
enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
584
                            const char *filename, const char *mime_type, enum CodecType type);
585

    
586
/**
587
 * Send a nice hexadecimal dump of a buffer to the specified file stream.
588
 *
589
 * @param f The file stream pointer where the dump should be sent to.
590
 * @param buf buffer
591
 * @param size buffer size
592
 *
593
 * @see av_hex_dump_log, av_pkt_dump, av_pkt_dump_log
594
 */
595
void av_hex_dump(FILE *f, uint8_t *buf, int size);
596

    
597
/**
598
 * Send a nice hexadecimal dump of a buffer to the log.
599
 *
600
 * @param avcl A pointer to an arbitrary struct of which the first field is a
601
 * pointer to an AVClass struct.
602
 * @param level The importance level of the message, lower values signifying
603
 * higher importance.
604
 * @param buf buffer
605
 * @param size buffer size
606
 *
607
 * @see av_hex_dump, av_pkt_dump, av_pkt_dump_log
608
 */
609
void av_hex_dump_log(void *avcl, int level, uint8_t *buf, int size);
610

    
611
/**
612
 * Send a nice dump of a packet to the specified file stream.
613
 *
614
 * @param f The file stream pointer where the dump should be sent to.
615
 * @param pkt packet to dump
616
 * @param dump_payload true if the payload must be displayed too
617
 */
618
void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
619

    
620
/**
621
 * Send a nice dump of a packet to the log.
622
 *
623
 * @param avcl A pointer to an arbitrary struct of which the first field is a
624
 * pointer to an AVClass struct.
625
 * @param level The importance level of the message, lower values signifying
626
 * higher importance.
627
 * @param pkt packet to dump
628
 * @param dump_payload true if the payload must be displayed too
629
 */
630
void av_pkt_dump_log(void *avcl, int level, AVPacket *pkt, int dump_payload);
631

    
632
void av_register_all(void);
633

    
634
/** codec tag <-> codec id */
635
enum CodecID av_codec_get_id(const struct AVCodecTag **tags, unsigned int tag);
636
unsigned int av_codec_get_tag(const struct AVCodecTag **tags, enum CodecID id);
637

    
638
/* media file input */
639

    
640
/**
641
 * finds AVInputFormat based on input format's short name.
642
 */
643
AVInputFormat *av_find_input_format(const char *short_name);
644

    
645
/**
646
 * Guess file format.
647
 *
648
 * @param is_opened whether the file is already opened, determines whether
649
 *                  demuxers with or without AVFMT_NOFILE are probed
650
 */
651
AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
652

    
653
/**
654
 * Allocates all the structures needed to read an input stream.
655
 *        This does not open the needed codecs for decoding the stream[s].
656
 */
657
int av_open_input_stream(AVFormatContext **ic_ptr,
658
                         ByteIOContext *pb, const char *filename,
659
                         AVInputFormat *fmt, AVFormatParameters *ap);
660

    
661
/**
662
 * Open a media file as input. The codecs are not opened. Only the file
663
 * header (if present) is read.
664
 *
665
 * @param ic_ptr the opened media file handle is put here
666
 * @param filename filename to open.
667
 * @param fmt if non NULL, force the file format to use
668
 * @param buf_size optional buffer size (zero if default is OK)
669
 * @param ap additional parameters needed when opening the file (NULL if default)
670
 * @return 0 if OK. AVERROR_xxx otherwise.
671
 */
672
int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
673
                       AVInputFormat *fmt,
674
                       int buf_size,
675
                       AVFormatParameters *ap);
676
/**
677
 * Allocate an AVFormatContext.
678
 * Can be freed with av_free() but do not forget to free everything you
679
 * explicitly allocated as well!
680
 */
681
AVFormatContext *av_alloc_format_context(void);
682

    
683
/**
684
 * Read packets of a media file to get stream information. This
685
 * is useful for file formats with no headers such as MPEG. This
686
 * function also computes the real frame rate in case of mpeg2 repeat
687
 * frame mode.
688
 * The logical file position is not changed by this function;
689
 * examined packets may be buffered for later processing.
690
 *
691
 * @param ic media file handle
692
 * @return >=0 if OK. AVERROR_xxx if error.
693
 * @todo Let user decide somehow what information is needed so we do not waste time getting stuff the user does not need.
694
 */
695
int av_find_stream_info(AVFormatContext *ic);
696

    
697
/**
698
 * Read a transport packet from a media file.
699
 *
700
 * This function is obsolete and should never be used.
701
 * Use av_read_frame() instead.
702
 *
703
 * @param s media file handle
704
 * @param pkt is filled
705
 * @return 0 if OK. AVERROR_xxx if error.
706
 */
707
int av_read_packet(AVFormatContext *s, AVPacket *pkt);
708

    
709
/**
710
 * Return the next frame of a stream.
711
 *
712
 * The returned packet is valid
713
 * until the next av_read_frame() or until av_close_input_file() and
714
 * must be freed with av_free_packet. For video, the packet contains
715
 * exactly one frame. For audio, it contains an integer number of
716
 * frames if each frame has a known fixed size (e.g. PCM or ADPCM
717
 * data). If the audio frames have a variable size (e.g. MPEG audio),
718
 * then it contains one frame.
719
 *
720
 * pkt->pts, pkt->dts and pkt->duration are always set to correct
721
 * values in AVStream.timebase units (and guessed if the format cannot
722
 * provided them). pkt->pts can be AV_NOPTS_VALUE if the video format
723
 * has B frames, so it is better to rely on pkt->dts if you do not
724
 * decompress the payload.
725
 *
726
 * @return 0 if OK, < 0 if error or end of file.
727
 */
728
int av_read_frame(AVFormatContext *s, AVPacket *pkt);
729

    
730
/**
731
 * Seek to the key frame at timestamp.
732
 * 'timestamp' in 'stream_index'.
733
 * @param stream_index If stream_index is (-1), a default
734
 * stream is selected, and timestamp is automatically converted
735
 * from AV_TIME_BASE units to the stream specific time_base.
736
 * @param timestamp timestamp in AVStream.time_base units
737
 *        or if there is no stream specified then in AV_TIME_BASE units
738
 * @param flags flags which select direction and seeking mode
739
 * @return >= 0 on success
740
 */
741
int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp, int flags);
742

    
743
/**
744
 * start playing a network based stream (e.g. RTSP stream) at the
745
 * current position
746
 */
747
int av_read_play(AVFormatContext *s);
748

    
749
/**
750
 * Pause a network based stream (e.g. RTSP stream).
751
 *
752
 * Use av_read_play() to resume it.
753
 */
754
int av_read_pause(AVFormatContext *s);
755

    
756
/**
757
 * Free a AVFormatContext allocated by av_open_input_stream.
758
 * @param s context to free
759
 */
760
void av_close_input_stream(AVFormatContext *s);
761

    
762
/**
763
 * Close a media file (but not its codecs).
764
 *
765
 * @param s media file handle
766
 */
767
void av_close_input_file(AVFormatContext *s);
768

    
769
/**
770
 * Add a new stream to a media file.
771
 *
772
 * Can only be called in the read_header() function. If the flag
773
 * AVFMTCTX_NOHEADER is in the format context, then new streams
774
 * can be added in read_packet too.
775
 *
776
 * @param s media file handle
777
 * @param id file format dependent stream id
778
 */
779
AVStream *av_new_stream(AVFormatContext *s, int id);
780
AVProgram *av_new_program(AVFormatContext *s, int id);
781

    
782
/**
783
 * Add a new chapter.
784
 * This function is NOT part of the public API
785
 * and should be ONLY used by demuxers.
786
 *
787
 * @param s media file handle
788
 * @param id unique id for this chapter
789
 * @param start chapter start time in time_base units
790
 * @param end chapter end time in time_base units
791
 * @param title chapter title
792
 *
793
 * @return AVChapter or NULL if error.
794
 */
795
AVChapter *ff_new_chapter(AVFormatContext *s, int id, AVRational time_base, int64_t start, int64_t end, const char *title);
796

    
797
/**
798
 * Set the pts for a given stream.
799
 *
800
 * @param s stream
801
 * @param pts_wrap_bits number of bits effectively used by the pts
802
 *        (used for wrap control, 33 is the value for MPEG)
803
 * @param pts_num numerator to convert to seconds (MPEG: 1)
804
 * @param pts_den denominator to convert to seconds (MPEG: 90000)
805
 */
806
void av_set_pts_info(AVStream *s, int pts_wrap_bits,
807
                     int pts_num, int pts_den);
808

    
809
#define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
810
#define AVSEEK_FLAG_BYTE     2 ///< seeking based on position in bytes
811
#define AVSEEK_FLAG_ANY      4 ///< seek to any frame, even non keyframes
812

    
813
int av_find_default_stream_index(AVFormatContext *s);
814

    
815
/**
816
 * Gets the index for a specific timestamp.
817
 * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond to
818
 *                 the timestamp which is <= the requested one, if backward is 0
819
 *                 then it will be >=
820
 *              if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
821
 * @return < 0 if no such timestamp could be found
822
 */
823
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
824

    
825
/**
826
 * Ensures the index uses less memory than the maximum specified in
827
 * AVFormatContext.max_index_size, by discarding entries if it grows
828
 * too large.
829
 * This function is not part of the public API and should only be called
830
 * by demuxers.
831
 */
832
void ff_reduce_index(AVFormatContext *s, int stream_index);
833

    
834
/**
835
 * Add a index entry into a sorted list updateing if it is already there.
836
 *
837
 * @param timestamp timestamp in the timebase of the given stream
838
 */
839
int av_add_index_entry(AVStream *st,
840
                       int64_t pos, int64_t timestamp, int size, int distance, int flags);
841

    
842
/**
843
 * Does a binary search using av_index_search_timestamp() and AVCodec.read_timestamp().
844
 * This is not supposed to be called directly by a user application, but by demuxers.
845
 * @param target_ts target timestamp in the time base of the given stream
846
 * @param stream_index stream number
847
 */
848
int av_seek_frame_binary(AVFormatContext *s, int stream_index, int64_t target_ts, int flags);
849

    
850
/**
851
 * Updates cur_dts of all streams based on given timestamp and AVStream.
852
 *
853
 * Stream ref_st unchanged, others set cur_dts in their native timebase
854
 * only needed for timestamp wrapping or if (dts not set and pts!=dts).
855
 * @param timestamp new dts expressed in time_base of param ref_st
856
 * @param ref_st reference stream giving time_base of param timestamp
857
 */
858
void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
859

    
860
/**
861
 * Does a binary search using read_timestamp().
862
 * This is not supposed to be called directly by a user application, but by demuxers.
863
 * @param target_ts target timestamp in the time base of the given stream
864
 * @param stream_index stream number
865
 */
866
int64_t av_gen_search(AVFormatContext *s, int stream_index, int64_t target_ts, int64_t pos_min, int64_t pos_max, int64_t pos_limit, int64_t ts_min, int64_t ts_max, int flags, int64_t *ts_ret, int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
867

    
868
/** media file output */
869
int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
870

    
871
/**
872
 * Allocate the stream private data and write the stream header to an
873
 * output media file.
874
 *
875
 * @param s media file handle
876
 * @return 0 if OK. AVERROR_xxx if error.
877
 */
878
int av_write_header(AVFormatContext *s);
879

    
880
/**
881
 * Write a packet to an output media file.
882
 *
883
 * The packet shall contain one audio or video frame.
884
 * The packet must be correctly interleaved according to the container specification,
885
 * if not then av_interleaved_write_frame must be used
886
 *
887
 * @param s media file handle
888
 * @param pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ...
889
 * @return < 0 if error, = 0 if OK, 1 if end of stream wanted.
890
 */
891
int av_write_frame(AVFormatContext *s, AVPacket *pkt);
892

    
893
/**
894
 * Writes a packet to an output media file ensuring correct interleaving.
895
 *
896
 * The packet must contain one audio or video frame.
897
 * If the packets are already correctly interleaved the application should
898
 * call av_write_frame() instead as it is slightly faster. It is also important
899
 * to keep in mind that completely non-interleaved input will need huge amounts
900
 * of memory to interleave with this, so it is preferable to interleave at the
901
 * demuxer level.
902
 *
903
 * @param s media file handle
904
 * @param pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ...
905
 * @return < 0 if error, = 0 if OK, 1 if end of stream wanted.
906
 */
907
int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
908

    
909
/**
910
 * Interleave a packet per DTS in an output media file.
911
 *
912
 * Packets with pkt->destruct == av_destruct_packet will be freed inside this function,
913
 * so they cannot be used after it, note calling av_free_packet() on them is still safe.
914
 *
915
 * @param s media file handle
916
 * @param out the interleaved packet will be output here
917
 * @param in the input packet
918
 * @param flush 1 if no further packets are available as input and all
919
 *              remaining packets should be output
920
 * @return 1 if a packet was output, 0 if no packet could be output,
921
 *         < 0 if an error occurred
922
 */
923
int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush);
924

    
925
/**
926
 * @brief Write the stream trailer to an output media file and
927
 *        free the file private data.
928
 *
929
 * @param s media file handle
930
 * @return 0 if OK. AVERROR_xxx if error.
931
 */
932
int av_write_trailer(AVFormatContext *s);
933

    
934
void dump_format(AVFormatContext *ic,
935
                 int index,
936
                 const char *url,
937
                 int is_output);
938

    
939
/**
940
 * parses width and height out of string str.
941
 * @deprecated Use av_parse_video_frame_size instead.
942
 */
943
attribute_deprecated int parse_image_size(int *width_ptr, int *height_ptr, const char *str);
944

    
945
/**
946
 * Converts frame rate from string to a fraction.
947
 * @deprecated Use av_parse_video_frame_rate instead.
948
 */
949
attribute_deprecated int parse_frame_rate(int *frame_rate, int *frame_rate_base, const char *arg);
950

    
951
/**
952
 * Parses \p datestr and returns a corresponding number of microseconds.
953
 * @param datestr String representing a date or a duration.
954
 * - If a date the syntax is:
955
 * @code
956
 *  [{YYYY-MM-DD|YYYYMMDD}]{T| }{HH[:MM[:SS[.m...]]][Z]|HH[MM[SS[.m...]]][Z]}
957
 * @endcode
958
 * Time is localtime unless Z is appended, in which case it is
959
 * interpreted as UTC.
960
 * If the year-month-day part isn't specified it takes the current
961
 * year-month-day.
962
 * Returns the number of microseconds since 1st of January, 1970 up to
963
 * the time of the parsed date or INT64_MIN if \p datestr cannot be
964
 * successfully parsed.
965
 * - If a duration the syntax is:
966
 * @code
967
 *  [-]HH[:MM[:SS[.m...]]]
968
 *  [-]S+[.m...]
969
 * @endcode
970
 * Returns the number of microseconds contained in a time interval
971
 * with the specified duration or INT64_MIN if \p datestr cannot be
972
 * successfully parsed.
973
 * @param duration Flag which tells how to interpret \p datestr, if
974
 * not zero \p datestr is interpreted as a duration, otherwise as a
975
 * date.
976
 */
977
int64_t parse_date(const char *datestr, int duration);
978

    
979
int64_t av_gettime(void);
980

    
981
/* ffm specific for ffserver */
982
#define FFM_PACKET_SIZE 4096
983
offset_t ffm_read_write_index(int fd);
984
void ffm_write_write_index(int fd, offset_t pos);
985
void ffm_set_write_index(AVFormatContext *s, offset_t pos, offset_t file_size);
986

    
987
/**
988
 * Attempts to find a specific tag in a URL.
989
 *
990
 * syntax: '?tag1=val1&tag2=val2...'. Little URL decoding is done.
991
 * Return 1 if found.
992
 */
993
int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
994

    
995
/**
996
 * Returns in 'buf' the path with '%d' replaced by number.
997

998
 * Also handles the '%0nd' format where 'n' is the total number
999
 * of digits and '%%'.
1000
 *
1001
 * @param buf destination buffer
1002
 * @param buf_size destination buffer size
1003
 * @param path numbered sequence string
1004
 * @param number frame number
1005
 * @return 0 if OK, -1 if format error.
1006
 */
1007
int av_get_frame_filename(char *buf, int buf_size,
1008
                          const char *path, int number);
1009

    
1010
/**
1011
 * Check whether filename actually is a numbered sequence generator.
1012
 *
1013
 * @param filename possible numbered sequence string
1014
 * @return 1 if a valid numbered sequence string, 0 otherwise.
1015
 */
1016
int av_filename_number_test(const char *filename);
1017

    
1018
/**
1019
 * Generate an SDP for an RTP session.
1020
 *
1021
 * @param ac array of AVFormatContexts describing the RTP streams. If the
1022
 *           array is composed by only one context, such context can contain
1023
 *           multiple AVStreams (one AVStream per RTP stream). Otherwise,
1024
 *           all the contexts in the array (an AVCodecContext per RTP stream)
1025
 *           must contain only one AVStream
1026
 * @param n_files number of AVCodecContexts contained in ac
1027
 * @param buff buffer where the SDP will be stored (must be allocated by
1028
 *             the caller
1029
 * @param size the size of the buffer
1030
 * @return 0 if OK. AVERROR_xxx if error.
1031
 */
1032
int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size);
1033

    
1034
#ifdef HAVE_AV_CONFIG_H
1035

    
1036
void ff_dynarray_add(unsigned long **tab_ptr, int *nb_ptr, unsigned long elem);
1037

    
1038
#ifdef __GNUC__
1039
#define dynarray_add(tab, nb_ptr, elem)\
1040
do {\
1041
    typeof(tab) _tab = (tab);\
1042
    typeof(elem) _elem = (elem);\
1043
    (void)sizeof(**_tab == _elem); /* check that types are compatible */\
1044
    ff_dynarray_add((unsigned long **)_tab, nb_ptr, (unsigned long)_elem);\
1045
} while(0)
1046
#else
1047
#define dynarray_add(tab, nb_ptr, elem)\
1048
do {\
1049
    ff_dynarray_add((unsigned long **)(tab), nb_ptr, (unsigned long)(elem));\
1050
} while(0)
1051
#endif
1052

    
1053
time_t mktimegm(struct tm *tm);
1054
struct tm *brktimegm(time_t secs, struct tm *tm);
1055
const char *small_strptime(const char *p, const char *fmt,
1056
                           struct tm *dt);
1057

    
1058
struct in_addr;
1059
int resolve_host(struct in_addr *sin_addr, const char *hostname);
1060

    
1061
void url_split(char *proto, int proto_size,
1062
               char *authorization, int authorization_size,
1063
               char *hostname, int hostname_size,
1064
               int *port_ptr,
1065
               char *path, int path_size,
1066
               const char *url);
1067

    
1068
int match_ext(const char *filename, const char *extensions);
1069

    
1070
#endif /* HAVE_AV_CONFIG_H */
1071

    
1072
#endif /* FFMPEG_AVFORMAT_H */