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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_H
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#define AVFORMAT_H
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#define LIBAVFORMAT_VERSION_INT ((51<<16)+(12<<8)+1)
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#define LIBAVFORMAT_VERSION     51.12.2
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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 "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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    int64_t pts;                            ///< presentation time stamp in time_base units
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    int64_t dts;                            ///< decompression time stamp in time_base units
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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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#if LIBAVFORMAT_VERSION_INT < (52<<16)
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    const char *device; /**< video, audio or DV device */
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#endif
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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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    enum CodecID video_codec_id;
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    enum CodecID audio_codec_id;
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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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    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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    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 guranteed to be AVPROBE_PADDING_SIZE bytes big
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     * so you dont 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 AV_TIME_BASE units.
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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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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 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 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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#if LIBAVFORMAT_VERSION_INT < (52<<16)
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    int codec_info_nb_frames;
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#endif
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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/framerate 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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    /** decoding: pts of the first frame of the stream, in stream time base. */
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    int64_t start_time;
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    /** decoding: duration of the stream, in stream time base. */
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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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} AVStream;
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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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#define MAX_STREAMS 20
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/* format I/O context */
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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) */
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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.  */
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    int64_t start_time;
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    /** decoding: duration of the stream, in AV_TIME_BASE fractional
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       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 */
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    int64_t file_size;
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    /** 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
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       duration are known as ffmpeg can compute it automatically. */
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    int bit_rate;
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    /* av_read_frame() support */
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    AVStream *cur_st;
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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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    /* 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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    int packet_size;
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    int preload;
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    int max_delay;
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#define AVFMT_NOOUTPUTLOOP -1
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#define AVFMT_INFINITEOUTPUTLOOP 0
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    /** number of times to loop output in formats that support it */
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    int loop_output;
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    int flags;
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#define AVFMT_FLAG_GENPTS       0x0001 ///< generate pts if missing even if it requires parsing future frames
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#define AVFMT_FLAG_IGNIDX       0x0002 ///< ignore index
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#define AVFMT_FLAG_NONBLOCK     0x0004 ///< do not block when reading packets from input
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    int loop_input;
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    /** decoding: size of data to probe; encoding unused */
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    unsigned int probesize;
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    /**
416
     * maximum duration in AV_TIME_BASE units over which the input should be analyzed in av_find_stream_info()
417
     */
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    int max_analyze_duration;
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    const uint8_t *key;
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    int keylen;
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} AVFormatContext;
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typedef struct AVPacketList {
425
    AVPacket pkt;
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    struct AVPacketList *next;
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} AVPacketList;
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extern AVInputFormat *first_iformat;
430
extern AVOutputFormat *first_oformat;
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enum CodecID av_guess_image2_codec(const char *filename);
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/* XXX: use automatic init with either ELF sections or C file parser */
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/* modules */
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#include "rtp.h"
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#include "rtsp.h"
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/* utils.c */
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void av_register_input_format(AVInputFormat *format);
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void av_register_output_format(AVOutputFormat *format);
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AVOutputFormat *guess_stream_format(const char *short_name,
445
                                    const char *filename, const char *mime_type);
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AVOutputFormat *guess_format(const char *short_name,
447
                             const char *filename, const char *mime_type);
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/**
450
 * Guesses the codec id based upon muxer and filename.
451
 */
452
enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
453
                            const char *filename, const char *mime_type, enum CodecType type);
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455
/**
456
 * Send a nice hexadecimal dump of a buffer to the specified file stream.
457
 *
458
 * @param f The file stream pointer where the dump should be sent to.
459
 * @param buf buffer
460
 * @param size buffer size
461
 *
462
 * @see av_hex_dump_log, av_pkt_dump, av_pkt_dump_log
463
 */
464
void av_hex_dump(FILE *f, uint8_t *buf, int size);
465

    
466
/**
467
 * Send a nice hexadecimal dump of a buffer to the log.
468
 *
469
 * @param avcl A pointer to an arbitrary struct of which the first field is a
470
 * pointer to an AVClass struct.
471
 * @param level The importance level of the message, lower values signifying
472
 * higher importance.
473
 * @param buf buffer
474
 * @param size buffer size
475
 *
476
 * @see av_hex_dump, av_pkt_dump, av_pkt_dump_log
477
 */
478
void av_hex_dump_log(void *avcl, int level, uint8_t *buf, int size);
479

    
480
/**
481
 * Send a nice dump of a packet to the specified file stream.
482
 *
483
 * @param f The file stream pointer where the dump should be sent to.
484
 * @param pkt packet to dump
485
 * @param dump_payload true if the payload must be displayed too
486
 */
487
void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
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/**
490
 * Send a nice dump of a packet to the log.
491
 *
492
 * @param avcl A pointer to an arbitrary struct of which the first field is a
493
 * pointer to an AVClass struct.
494
 * @param level The importance level of the message, lower values signifying
495
 * higher importance.
496
 * @param pkt packet to dump
497
 * @param dump_payload true if the payload must be displayed too
498
 */
499
void av_pkt_dump_log(void *avcl, int level, AVPacket *pkt, int dump_payload);
500

    
501
void av_register_all(void);
502

    
503
/** codec tag <-> codec id */
504
enum CodecID av_codec_get_id(const struct AVCodecTag **tags, unsigned int tag);
505
unsigned int av_codec_get_tag(const struct AVCodecTag **tags, enum CodecID id);
506

    
507
/* media file input */
508

    
509
/**
510
 * finds AVInputFormat based on input format's short name.
511
 */
512
AVInputFormat *av_find_input_format(const char *short_name);
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514
/**
515
 * Guess file format.
516
 *
517
 * @param is_opened whether the file is already opened, determines whether
518
 *                  demuxers with or without AVFMT_NOFILE are probed
519
 */
520
AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
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522
/**
523
 * Allocates all the structures needed to read an input stream.
524
 *        This does not open the needed codecs for decoding the stream[s].
525
 */
526
int av_open_input_stream(AVFormatContext **ic_ptr,
527
                         ByteIOContext *pb, const char *filename,
528
                         AVInputFormat *fmt, AVFormatParameters *ap);
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530
/**
531
 * Open a media file as input. The codecs are not opened. Only the file
532
 * header (if present) is read.
533
 *
534
 * @param ic_ptr the opened media file handle is put here
535
 * @param filename filename to open.
536
 * @param fmt if non NULL, force the file format to use
537
 * @param buf_size optional buffer size (zero if default is OK)
538
 * @param ap additional parameters needed when opening the file (NULL if default)
539
 * @return 0 if OK. AVERROR_xxx otherwise.
540
 */
541
int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
542
                       AVInputFormat *fmt,
543
                       int buf_size,
544
                       AVFormatParameters *ap);
545
/** no av_open for output, so applications will need this: */
546
AVFormatContext *av_alloc_format_context(void);
547

    
548
/**
549
 * Read packets of a media file to get stream information. This
550
 * is useful for file formats with no headers such as MPEG. This
551
 * function also computes the real frame rate in case of mpeg2 repeat
552
 * frame mode.
553
 * The logical file position is not changed by this function;
554
 * examined packets may be buffered for later processing.
555
 *
556
 * @param ic media file handle
557
 * @return >=0 if OK. AVERROR_xxx if error.
558
 * @todo Let user decide somehow what information is needed so we do not waste time geting stuff the user does not need.
559
 */
560
int av_find_stream_info(AVFormatContext *ic);
561

    
562
/**
563
 * Read a transport packet from a media file.
564
 *
565
 * This function is obsolete and should never be used.
566
 * Use av_read_frame() instead.
567
 *
568
 * @param s media file handle
569
 * @param pkt is filled
570
 * @return 0 if OK. AVERROR_xxx if error.
571
 */
572
int av_read_packet(AVFormatContext *s, AVPacket *pkt);
573

    
574
/**
575
 * Return the next frame of a stream.
576
 *
577
 * The returned packet is valid
578
 * until the next av_read_frame() or until av_close_input_file() and
579
 * must be freed with av_free_packet. For video, the packet contains
580
 * exactly one frame. For audio, it contains an integer number of
581
 * frames if each frame has a known fixed size (e.g. PCM or ADPCM
582
 * data). If the audio frames have a variable size (e.g. MPEG audio),
583
 * then it contains one frame.
584
 *
585
 * pkt->pts, pkt->dts and pkt->duration are always set to correct
586
 * values in AVStream.timebase units (and guessed if the format cannot
587
 * provided them). pkt->pts can be AV_NOPTS_VALUE if the video format
588
 * has B frames, so it is better to rely on pkt->dts if you do not
589
 * decompress the payload.
590
 *
591
 * @return 0 if OK, < 0 if error or end of file.
592
 */
593
int av_read_frame(AVFormatContext *s, AVPacket *pkt);
594

    
595
/**
596
 * Seek to the key frame at timestamp.
597
 * 'timestamp' in 'stream_index'.
598
 * @param stream_index If stream_index is (-1), a default
599
 * stream is selected, and timestamp is automatically converted
600
 * from AV_TIME_BASE units to the stream specific time_base.
601
 * @param timestamp timestamp in AVStream.time_base units
602
 *        or if there is no stream specified then in AV_TIME_BASE units
603
 * @param flags flags which select direction and seeking mode
604
 * @return >= 0 on success
605
 */
606
int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp, int flags);
607

    
608
/**
609
 * start playing a network based stream (e.g. RTSP stream) at the
610
 * current position
611
 */
612
int av_read_play(AVFormatContext *s);
613

    
614
/**
615
 * Pause a network based stream (e.g. RTSP stream).
616
 *
617
 * Use av_read_play() to resume it.
618
 */
619
int av_read_pause(AVFormatContext *s);
620

    
621
/**
622
 * Close a media file (but not its codecs).
623
 *
624
 * @param s media file handle
625
 */
626
void av_close_input_file(AVFormatContext *s);
627

    
628
/**
629
 * Add a new stream to a media file.
630
 *
631
 * Can only be called in the read_header() function. If the flag
632
 * AVFMTCTX_NOHEADER is in the format context, then new streams
633
 * can be added in read_packet too.
634
 *
635
 * @param s media file handle
636
 * @param id file format dependent stream id
637
 */
638
AVStream *av_new_stream(AVFormatContext *s, int id);
639

    
640
/**
641
 * Set the pts for a given stream.
642
 *
643
 * @param s stream
644
 * @param pts_wrap_bits number of bits effectively used by the pts
645
 *        (used for wrap control, 33 is the value for MPEG)
646
 * @param pts_num numerator to convert to seconds (MPEG: 1)
647
 * @param pts_den denominator to convert to seconds (MPEG: 90000)
648
 */
649
void av_set_pts_info(AVStream *s, int pts_wrap_bits,
650
                     int pts_num, int pts_den);
651

    
652
#define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
653
#define AVSEEK_FLAG_BYTE     2 ///< seeking based on position in bytes
654
#define AVSEEK_FLAG_ANY      4 ///< seek to any frame, even non keyframes
655

    
656
int av_find_default_stream_index(AVFormatContext *s);
657

    
658
/**
659
 * Gets the index for a specific timestamp.
660
 * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond to
661
 *                 the timestamp which is <= the requested one, if backward is 0
662
 *                 then it will be >=
663
 *              if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
664
 * @return < 0 if no such timestamp could be found
665
 */
666
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
667

    
668
/**
669
 * Add a index entry into a sorted list updateing if it is already there.
670
 *
671
 * @param timestamp timestamp in the timebase of the given stream
672
 */
673
int av_add_index_entry(AVStream *st,
674
                       int64_t pos, int64_t timestamp, int size, int distance, int flags);
675

    
676
/**
677
 * Does a binary search using av_index_search_timestamp() and AVCodec.read_timestamp().
678
 * This is not supposed to be called directly by a user application, but by demuxers.
679
 * @param target_ts target timestamp in the time base of the given stream
680
 * @param stream_index stream number
681
 */
682
int av_seek_frame_binary(AVFormatContext *s, int stream_index, int64_t target_ts, int flags);
683

    
684
/**
685
 * Updates cur_dts of all streams based on given timestamp and AVStream.
686
 *
687
 * Stream ref_st unchanged, others set cur_dts in their native timebase
688
 * only needed for timestamp wrapping or if (dts not set and pts!=dts).
689
 * @param timestamp new dts expressed in time_base of param ref_st
690
 * @param ref_st reference stream giving time_base of param timestamp
691
 */
692
void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
693

    
694
/**
695
 * Does a binary search using read_timestamp().
696
 * This is not supposed to be called directly by a user application, but by demuxers.
697
 * @param target_ts target timestamp in the time base of the given stream
698
 * @param stream_index stream number
699
 */
700
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 ));
701

    
702
/** media file output */
703
int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
704

    
705
/**
706
 * Allocate the stream private data and write the stream header to an
707
 * output media file.
708
 *
709
 * @param s media file handle
710
 * @return 0 if OK. AVERROR_xxx if error.
711
 */
712
int av_write_header(AVFormatContext *s);
713

    
714
/**
715
 * Write a packet to an output media file.
716
 *
717
 * The packet shall contain one audio or video frame.
718
 * The packet must be correctly interleaved according to the container specification,
719
 * if not then av_interleaved_write_frame must be used
720
 *
721
 * @param s media file handle
722
 * @param pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ...
723
 * @return < 0 if error, = 0 if OK, 1 if end of stream wanted.
724
 */
725
int av_write_frame(AVFormatContext *s, AVPacket *pkt);
726

    
727
/**
728
 * Writes a packet to an output media file ensuring correct interleaving.
729
 *
730
 * The packet must contain one audio or video frame.
731
 * If the packets are already correctly interleaved the application should
732
 * call av_write_frame() instead as it is slightly faster. It is also important
733
 * to keep in mind that completely non-interleaved input will need huge amounts
734
 * of memory to interleave with this, so it is preferable to interleave at the
735
 * demuxer level.
736
 *
737
 * @param s media file handle
738
 * @param pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ...
739
 * @return < 0 if error, = 0 if OK, 1 if end of stream wanted.
740
 */
741
int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
742

    
743
/**
744
 * Interleave a packet per DTS in an output media file.
745
 *
746
 * Packets with pkt->destruct == av_destruct_packet will be freed inside this function,
747
 * so they cannot be used after it, note calling av_free_packet() on them is still safe.
748
 *
749
 * @param s media file handle
750
 * @param out the interleaved packet will be output here
751
 * @param in the input packet
752
 * @param flush 1 if no further packets are available as input and all
753
 *              remaining packets should be output
754
 * @return 1 if a packet was output, 0 if no packet could be output,
755
 *         < 0 if an error occured
756
 */
757
int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush);
758

    
759
/**
760
 * @brief Write the stream trailer to an output media file and
761
 *        free the file private data.
762
 *
763
 * @param s media file handle
764
 * @return 0 if OK. AVERROR_xxx if error.
765
 */
766
int av_write_trailer(AVFormatContext *s);
767

    
768
void dump_format(AVFormatContext *ic,
769
                 int index,
770
                 const char *url,
771
                 int is_output);
772

    
773
/**
774
 * parses width and height out of string str.
775
 * @deprecated Use av_parse_video_frame_size instead.
776
 */
777
attribute_deprecated int parse_image_size(int *width_ptr, int *height_ptr, const char *str);
778

    
779
/**
780
 * Converts frame rate from string to a fraction.
781
 * @deprecated Use av_parse_video_frame_rate instead.
782
 */
783
attribute_deprecated int parse_frame_rate(int *frame_rate, int *frame_rate_base, const char *arg);
784

    
785
/**
786
 * Converts date string to number of seconds since Jan 1st, 1970.
787
 *
788
 * @code
789
 * Syntax:
790
 * - If not a duration:
791
 *  [{YYYY-MM-DD|YYYYMMDD}]{T| }{HH[:MM[:SS[.m...]]][Z]|HH[MM[SS[.m...]]][Z]}
792
 * Time is localtime unless Z is suffixed to the end. In this case GMT
793
 * Return the date in micro seconds since 1970
794
 *
795
 * - If a duration:
796
 *  HH[:MM[:SS[.m...]]]
797
 *  S+[.m...]
798
 * @endcode
799
 */
800
int64_t parse_date(const char *datestr, int duration);
801

    
802
int64_t av_gettime(void);
803

    
804
/* ffm specific for ffserver */
805
#define FFM_PACKET_SIZE 4096
806
offset_t ffm_read_write_index(int fd);
807
void ffm_write_write_index(int fd, offset_t pos);
808
void ffm_set_write_index(AVFormatContext *s, offset_t pos, offset_t file_size);
809

    
810
/**
811
 * Attempts to find a specific tag in a URL.
812
 *
813
 * syntax: '?tag1=val1&tag2=val2...'. Little URL decoding is done.
814
 * Return 1 if found.
815
 */
816
int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
817

    
818
/**
819
 * Returns in 'buf' the path with '%d' replaced by number.
820

821
 * Also handles the '%0nd' format where 'n' is the total number
822
 * of digits and '%%'.
823
 *
824
 * @param buf destination buffer
825
 * @param buf_size destination buffer size
826
 * @param path numbered sequence string
827
 * @number frame number
828
 * @return 0 if OK, -1 if format error.
829
 */
830
int av_get_frame_filename(char *buf, int buf_size,
831
                          const char *path, int number);
832

    
833
/**
834
 * Check whether filename actually is a numbered sequence generator.
835
 *
836
 * @param filename possible numbered sequence string
837
 * @return 1 if a valid numbered sequence string, 0 otherwise.
838
 */
839
int av_filename_number_test(const char *filename);
840

    
841
/**
842
 * Generate an SDP for an RTP session.
843
 *
844
 * @param ac array of AVFormatContexts describing the RTP streams. If the
845
 *           array is composed by only one context, such context can contain
846
 *           multiple AVStreams (one AVStream per RTP stream). Otherwise,
847
 *           all the contexts in the array (an AVCodecContext per RTP stream)
848
 *           must contain only one AVStream
849
 * @param n_files number of AVCodecContexts contained in ac
850
 * @param buff buffer where the SDP will be stored (must be allocated by
851
 *             the caller
852
 * @param size the size of the buffer
853
 * @return 0 if OK. AVERROR_xxx if error.
854
 */
855
int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size);
856

    
857
#ifdef HAVE_AV_CONFIG_H
858

    
859
#include "os_support.h"
860

    
861
void __dynarray_add(unsigned long **tab_ptr, int *nb_ptr, unsigned long elem);
862

    
863
#ifdef __GNUC__
864
#define dynarray_add(tab, nb_ptr, elem)\
865
do {\
866
    typeof(tab) _tab = (tab);\
867
    typeof(elem) _elem = (elem);\
868
    (void)sizeof(**_tab == _elem); /* check that types are compatible */\
869
    __dynarray_add((unsigned long **)_tab, nb_ptr, (unsigned long)_elem);\
870
} while(0)
871
#else
872
#define dynarray_add(tab, nb_ptr, elem)\
873
do {\
874
    __dynarray_add((unsigned long **)(tab), nb_ptr, (unsigned long)(elem));\
875
} while(0)
876
#endif
877

    
878
time_t mktimegm(struct tm *tm);
879
struct tm *brktimegm(time_t secs, struct tm *tm);
880
const char *small_strptime(const char *p, const char *fmt,
881
                           struct tm *dt);
882

    
883
struct in_addr;
884
int resolve_host(struct in_addr *sin_addr, const char *hostname);
885

    
886
void url_split(char *proto, int proto_size,
887
               char *authorization, int authorization_size,
888
               char *hostname, int hostname_size,
889
               int *port_ptr,
890
               char *path, int path_size,
891
               const char *url);
892

    
893
int match_ext(const char *filename, const char *extensions);
894

    
895
#endif /* HAVE_AV_CONFIG_H */
896

    
897
#endif /* AVFORMAT_H */
898