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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 Libav.
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 *
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 * Libav 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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 * Libav 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 Libav; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#ifndef AVFORMAT_AVFORMAT_H
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#define AVFORMAT_AVFORMAT_H
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/**
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 * I return the LIBAVFORMAT_VERSION_INT constant.  You got
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 * a fucking problem with that, douchebag?
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 */
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unsigned avformat_version(void);
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/**
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 * Return the libavformat build-time configuration.
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 */
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const char *avformat_configuration(void);
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/**
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 * Return the libavformat license.
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 */
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const char *avformat_license(void);
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#include <time.h>
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#include <stdio.h>  /* FILE */
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#include "libavcodec/avcodec.h"
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#include "avio.h"
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#include "libavformat/version.h"
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struct AVFormatContext;
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/*
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 * Public Metadata API.
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 * The metadata API allows libavformat to export metadata tags to a client
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 * application using a sequence of key/value pairs. Like all strings in Libav,
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 * metadata must be stored as UTF-8 encoded Unicode. Note that metadata
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 * exported by demuxers isn't checked to be valid UTF-8 in most cases.
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 * Important concepts to keep in mind:
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 * 1. Keys are unique; there can never be 2 tags with the same key. This is
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 *    also meant semantically, i.e., a demuxer should not knowingly produce
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 *    several keys that are literally different but semantically identical.
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 *    E.g., key=Author5, key=Author6. In this example, all authors must be
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 *    placed in the same tag.
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 * 2. Metadata is flat, not hierarchical; there are no subtags. If you
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 *    want to store, e.g., the email address of the child of producer Alice
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 *    and actor Bob, that could have key=alice_and_bobs_childs_email_address.
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 * 3. Several modifiers can be applied to the tag name. This is done by
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 *    appending a dash character ('-') and the modifier name in the order
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 *    they appear in the list below -- e.g. foo-eng-sort, not foo-sort-eng.
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 *    a) language -- a tag whose value is localized for a particular language
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 *       is appended with the ISO 639-2/B 3-letter language code.
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 *       For example: Author-ger=Michael, Author-eng=Mike
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 *       The original/default language is in the unqualified "Author" tag.
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 *       A demuxer should set a default if it sets any translated tag.
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 *    b) sorting  -- a modified version of a tag that should be used for
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 *       sorting will have '-sort' appended. E.g. artist="The Beatles",
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 *       artist-sort="Beatles, The".
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 *
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 * 4. Demuxers attempt to export metadata in a generic format, however tags
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 *    with no generic equivalents are left as they are stored in the container.
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 *    Follows a list of generic tag names:
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 *
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 * album        -- name of the set this work belongs to
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 * album_artist -- main creator of the set/album, if different from artist.
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 *                 e.g. "Various Artists" for compilation albums.
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 * artist       -- main creator of the work
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 * comment      -- any additional description of the file.
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 * composer     -- who composed the work, if different from artist.
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 * copyright    -- name of copyright holder.
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 * creation_time-- date when the file was created, preferably in ISO 8601.
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 * date         -- date when the work was created, preferably in ISO 8601.
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 * disc         -- number of a subset, e.g. disc in a multi-disc collection.
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 * encoder      -- name/settings of the software/hardware that produced the file.
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 * encoded_by   -- person/group who created the file.
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 * filename     -- original name of the file.
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 * genre        -- <self-evident>.
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 * language     -- main language in which the work is performed, preferably
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 *                 in ISO 639-2 format. Multiple languages can be specified by
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 *                 separating them with commas.
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 * performer    -- artist who performed the work, if different from artist.
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 *                 E.g for "Also sprach Zarathustra", artist would be "Richard
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 *                 Strauss" and performer "London Philharmonic Orchestra".
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 * publisher    -- name of the label/publisher.
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 * service_name     -- name of the service in broadcasting (channel name).
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 * service_provider -- name of the service provider in broadcasting.
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 * title        -- name of the work.
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 * track        -- number of this work in the set, can be in form current/total.
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 */
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#define AV_METADATA_MATCH_CASE      1
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#define AV_METADATA_IGNORE_SUFFIX   2
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#define AV_METADATA_DONT_STRDUP_KEY 4
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#define AV_METADATA_DONT_STRDUP_VAL 8
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#define AV_METADATA_DONT_OVERWRITE 16   ///< Don't overwrite existing tags.
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typedef struct {
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    char *key;
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    char *value;
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}AVMetadataTag;
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typedef struct AVMetadata AVMetadata;
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#if FF_API_OLD_METADATA2
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typedef struct AVMetadataConv AVMetadataConv;
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#endif
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/**
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 * Get a metadata element with matching key.
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 *
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 * @param prev Set to the previous matching element to find the next.
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 *             If set to NULL the first matching element is returned.
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 * @param flags Allows case as well as suffix-insensitive comparisons.
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 * @return Found tag or NULL, changing key or value leads to undefined behavior.
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 */
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AVMetadataTag *
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av_metadata_get(AVMetadata *m, const char *key, const AVMetadataTag *prev, int flags);
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/**
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 * Set the given tag in *pm, overwriting an existing tag.
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 *
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 * @param pm pointer to a pointer to a metadata struct. If *pm is NULL
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 * a metadata struct is allocated and put in *pm.
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 * @param key tag key to add to *pm (will be av_strduped depending on flags)
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 * @param value tag value to add to *pm (will be av_strduped depending on flags).
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 *        Passing a NULL value will cause an existing tag to be deleted.
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 * @return >= 0 on success otherwise an error code <0
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 */
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int av_metadata_set2(AVMetadata **pm, const char *key, const char *value, int flags);
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#if FF_API_OLD_METADATA2
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/**
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 * This function is provided for compatibility reason and currently does nothing.
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 */
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attribute_deprecated void av_metadata_conv(struct AVFormatContext *ctx, const AVMetadataConv *d_conv,
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                                                                        const AVMetadataConv *s_conv);
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#endif
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/**
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 * Copy metadata from one AVMetadata struct into another.
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 * @param dst pointer to a pointer to a AVMetadata struct. If *dst is NULL,
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 *            this function will allocate a struct for you and put it in *dst
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 * @param src pointer to source AVMetadata struct
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 * @param flags flags to use when setting metadata in *dst
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 * @note metadata is read using the AV_METADATA_IGNORE_SUFFIX flag
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 */
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void av_metadata_copy(AVMetadata **dst, AVMetadata *src, int flags);
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/**
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 * Free all the memory allocated for an AVMetadata struct.
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 */
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void av_metadata_free(AVMetadata **m);
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/* packet functions */
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/**
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 * Allocate and read the payload of a packet and initialize its
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 * fields with default values.
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 *
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 * @param pkt packet
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 * @param size desired payload size
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 * @return >0 (read size) if OK, AVERROR_xxx otherwise
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 */
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int av_get_packet(AVIOContext *s, AVPacket *pkt, int size);
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/**
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 * Read data and append it to the current content of the AVPacket.
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 * If pkt->size is 0 this is identical to av_get_packet.
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 * Note that this uses av_grow_packet and thus involves a realloc
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 * which is inefficient. Thus this function should only be used
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 * when there is no reasonable way to know (an upper bound of)
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 * the final size.
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 *
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 * @param pkt packet
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 * @param size amount of data to read
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 * @return >0 (read size) if OK, AVERROR_xxx otherwise, previous data
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 *         will not be lost even if an error occurs.
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 */
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int av_append_packet(AVIOContext *s, AVPacket *pkt, int size);
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/*************************************************/
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/* fractional numbers for exact pts handling */
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/**
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 * The exact value of the fractional number is: 'val + num / den'.
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 * num is assumed to be 0 <= num < den.
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 */
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typedef struct AVFrac {
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    int64_t val, num, den;
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} AVFrac;
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/*************************************************/
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/* input/output formats */
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struct AVCodecTag;
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/**
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 * This structure contains the data a format has to probe a file.
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 */
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typedef struct AVProbeData {
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    const char *filename;
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    unsigned char *buf; /**< Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero. */
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    int buf_size;       /**< Size of buf except extra allocated bytes */
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} AVProbeData;
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#define AVPROBE_SCORE_MAX 100               ///< maximum score, half of that is used for file-extension-based detection
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#define AVPROBE_PADDING_SIZE 32             ///< extra allocated bytes at the end of the probe buffer
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typedef struct AVFormatParameters {
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    AVRational time_base;
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    int sample_rate;
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    int channels;
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    int width;
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    int height;
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    enum PixelFormat pix_fmt;
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    int channel; /**< Used to select DV channel. */
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    const char *standard; /**< TV standard, NTSC, PAL, SECAM */
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    unsigned int mpeg2ts_raw:1;  /**< Force raw MPEG-2 transport stream output, if possible. */
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    unsigned int mpeg2ts_compute_pcr:1; /**< Compute exact PCR for each transport
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                                            stream packet (only meaningful if
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                                            mpeg2ts_raw is TRUE). */
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    unsigned int initial_pause:1;       /**< Do not begin to play the stream
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                                            immediately (RTSP only). */
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    unsigned int prealloced_context:1;
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} AVFormatParameters;
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//! Demuxer will use avio_open, no opened file should be provided by the caller.
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#define AVFMT_NOFILE        0x0001
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#define AVFMT_NEEDNUMBER    0x0002 /**< Needs '%d' in filename. */
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#define AVFMT_SHOW_IDS      0x0008 /**< Show format stream IDs numbers. */
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#define AVFMT_RAWPICTURE    0x0020 /**< Format wants AVPicture structure for
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                                      raw picture data. */
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#define AVFMT_GLOBALHEADER  0x0040 /**< Format wants global header. */
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#define AVFMT_NOTIMESTAMPS  0x0080 /**< Format does not need / have any timestamps. */
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#define AVFMT_GENERIC_INDEX 0x0100 /**< Use generic index building code. */
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#define AVFMT_TS_DISCONT    0x0200 /**< Format allows timestamp discontinuities. Note, muxers always require valid (monotone) timestamps */
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#define AVFMT_VARIABLE_FPS  0x0400 /**< Format allows variable fps. */
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#define AVFMT_NODIMENSIONS  0x0800 /**< Format does not need width/height */
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#define AVFMT_NOSTREAMS     0x1000 /**< Format does not require any streams */
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typedef struct AVOutputFormat {
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    const char *name;
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    /**
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     * Descriptive name for the format, meant to be more human-readable
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     * than name. You should use the NULL_IF_CONFIG_SMALL() macro
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     * to define it.
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     */
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    const char *long_name;
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    const char *mime_type;
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    const char *extensions; /**< comma-separated filename extensions */
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    /**
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     * size of private data so that it can be allocated in the wrapper
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     */
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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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    /**
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     * can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_RAWPICTURE,
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     * AVFMT_GLOBALHEADER, AVFMT_NOTIMESTAMPS, AVFMT_VARIABLE_FPS,
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     * AVFMT_NODIMENSIONS, AVFMT_NOSTREAMS
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     */
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    int flags;
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    /**
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     * Currently only used to set pixel format if not YUV420P.
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     */
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    int (*set_parameters)(struct AVFormatContext *, AVFormatParameters *);
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    int (*interleave_packet)(struct AVFormatContext *, AVPacket *out,
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                             AVPacket *in, int flush);
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    /**
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     * List of supported codec_id-codec_tag pairs, ordered by "better
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     * choice first". The arrays are all terminated by CODEC_ID_NONE.
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     */
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    const struct AVCodecTag * const *codec_tag;
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    enum CodecID subtitle_codec; /**< default subtitle codec */
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#if FF_API_OLD_METADATA2
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    const AVMetadataConv *metadata_conv;
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#endif
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    const AVClass *priv_class; ///< AVClass for the private context
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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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    /**
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     * A comma separated list of short names for the format. New names
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     * may be appended with a minor bump.
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     */
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    const char *name;
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    /**
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     * Descriptive name for the format, meant to be more human-readable
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     * than name. You should use the NULL_IF_CONFIG_SMALL() macro
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     * to define it.
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     */
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    const char *long_name;
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    /**
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     * Size of private data so that it can be allocated in the wrapper.
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     */
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    int priv_data_size;
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    /**
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     * Tell if a given file has a chance of being parsed as this format.
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     * The buffer provided is guaranteed to be AVPROBE_PADDING_SIZE bytes
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     * big so you do not have to check for that unless you need more.
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     */
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    int (*read_probe)(AVProbeData *);
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    /**
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     * Read the format header and initialize the AVFormatContext
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     * structure. Return 0 if OK. 'ap' if non-NULL contains
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     * additional parameters. Only used in raw format right
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     * now. 'av_new_stream' should be called to create new streams.
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     */
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    int (*read_header)(struct AVFormatContext *,
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                       AVFormatParameters *ap);
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    /**
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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 and only in the calling thread (not in a
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     * background thread).
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     * @return 0 on success, < 0 on error.
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     *         When returning an error, pkt must not have been allocated
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     *         or must be freed before returning
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     */
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    int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
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    /**
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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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     */
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    int (*read_close)(struct AVFormatContext *);
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#if FF_API_READ_SEEK
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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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    attribute_deprecated int (*read_seek)(struct AVFormatContext *,
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                                          int stream_index, int64_t timestamp, int flags);
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#endif
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    /**
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     * Gets the next timestamp in stream[stream_index].time_base units.
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     * @return the timestamp or AV_NOPTS_VALUE if an error occurred
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     */
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    int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
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                              int64_t *pos, int64_t pos_limit);
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    /**
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     * Can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER.
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     */
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    int flags;
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    /**
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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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     */
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    const char *extensions;
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    /**
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     * General purpose read-only value that the format can use.
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     */
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    int value;
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    /**
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     * Start/resume playing - only meaningful if using a network-based format
402
     * (RTSP).
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     */
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    int (*read_play)(struct AVFormatContext *);
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    /**
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     * Pause playing - only meaningful if using a network-based format
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     * (RTSP).
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     */
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    int (*read_pause)(struct AVFormatContext *);
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    const struct AVCodecTag * const *codec_tag;
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    /**
415
     * Seek to timestamp ts.
416
     * Seeking will be done so that the point from which all active streams
417
     * can be presented successfully will be closest to ts and within min/max_ts.
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     * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
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     */
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    int (*read_seek2)(struct AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
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#if FF_API_OLD_METADATA2
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    const AVMetadataConv *metadata_conv;
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#endif
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    /* private fields */
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    struct AVInputFormat *next;
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} AVInputFormat;
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enum AVStreamParseType {
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    AVSTREAM_PARSE_NONE,
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    AVSTREAM_PARSE_FULL,       /**< full parsing and repack */
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    AVSTREAM_PARSE_HEADERS,    /**< Only parse headers, do not repack. */
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    AVSTREAM_PARSE_TIMESTAMPS, /**< full parsing and interpolation of timestamps for frames not starting on a packet boundary */
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    AVSTREAM_PARSE_FULL_ONCE,  /**< full parsing and repack of the first frame only, only implemented for H.264 currently */
436
};
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typedef struct AVIndexEntry {
439
    int64_t pos;
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    int64_t timestamp;
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#define AVINDEX_KEYFRAME 0x0001
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    int flags:2;
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    int size:30; //Yeah, trying to keep the size of this small to reduce memory requirements (it is 24 vs. 32 bytes due to possible 8-byte alignment).
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    int min_distance;         /**< Minimum distance between this and the previous keyframe, used to avoid unneeded searching. */
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} AVIndexEntry;
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#define AV_DISPOSITION_DEFAULT   0x0001
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#define AV_DISPOSITION_DUB       0x0002
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#define AV_DISPOSITION_ORIGINAL  0x0004
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#define AV_DISPOSITION_COMMENT   0x0008
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#define AV_DISPOSITION_LYRICS    0x0010
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#define AV_DISPOSITION_KARAOKE   0x0020
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/**
455
 * Track should be used during playback by default.
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 * Useful for subtitle track that should be displayed
457
 * even when user did not explicitly ask for subtitles.
458
 */
459
#define AV_DISPOSITION_FORCED    0x0040
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#define AV_DISPOSITION_HEARING_IMPAIRED  0x0080  /**< stream for hearing impaired audiences */
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#define AV_DISPOSITION_VISUAL_IMPAIRED   0x0100  /**< stream for visual impaired audiences */
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#define AV_DISPOSITION_CLEAN_EFFECTS     0x0200  /**< stream without voice */
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/**
465
 * Stream structure.
466
 * New fields can be added to the end with minor version bumps.
467
 * Removal, reordering and changes to existing fields require a major
468
 * version bump.
469
 * sizeof(AVStream) must not be used outside libav*.
470
 */
471
typedef struct AVStream {
472
    int index;    /**< stream index in AVFormatContext */
473
    int id;       /**< format-specific stream ID */
474
    AVCodecContext *codec; /**< codec context */
475
    /**
476
     * Real base framerate of the stream.
477
     * This is the lowest framerate with which all timestamps can be
478
     * represented accurately (it is the least common multiple of all
479
     * framerates in the stream). Note, this value is just a guess!
480
     * For example, if the time base is 1/90000 and all frames have either
481
     * approximately 3600 or 1800 timer ticks, then r_frame_rate will be 50/1.
482
     */
483
    AVRational r_frame_rate;
484
    void *priv_data;
485

    
486
    /* internal data used in av_find_stream_info() */
487
    int64_t first_dts;
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489
    /**
490
     * encoding: pts generation when outputting stream
491
     */
492
    struct AVFrac pts;
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494
    /**
495
     * This is the fundamental unit of time (in seconds) in terms
496
     * of which frame timestamps are represented. For fixed-fps content,
497
     * time base should be 1/framerate and timestamp increments should be 1.
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     * decoding: set by libavformat
499
     * encoding: set by libavformat in av_write_header
500
     */
501
    AVRational time_base;
502
    int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
503
    /* ffmpeg.c private use */
504
    int stream_copy; /**< If set, just copy stream. */
505
    enum AVDiscard discard; ///< Selects which packets can be discarded at will and do not need to be demuxed.
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507
    //FIXME move stuff to a flags field?
508
    /**
509
     * Quality, as it has been removed from AVCodecContext and put in AVVideoFrame.
510
     * MN: dunno if that is the right place for it
511
     */
512
    float quality;
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514
    /**
515
     * Decoding: pts of the first frame of the stream, in stream time base.
516
     * Only set this if you are absolutely 100% sure that the value you set
517
     * it to really is the pts of the first frame.
518
     * This may be undefined (AV_NOPTS_VALUE).
519
     */
520
    int64_t start_time;
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522
    /**
523
     * Decoding: duration of the stream, in stream time base.
524
     * If a source file does not specify a duration, but does specify
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     * a bitrate, this value will be estimated from bitrate and file size.
526
     */
527
    int64_t duration;
528

    
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    /* av_read_frame() support */
530
    enum AVStreamParseType need_parsing;
531
    struct AVCodecParserContext *parser;
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533
    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
538
                                    support seeking natively. */
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    int nb_index_entries;
540
    unsigned int index_entries_allocated_size;
541

    
542
    int64_t nb_frames;                 ///< number of frames in this stream if known or 0
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544
    int disposition; /**< AV_DISPOSITION_* bit field */
545

    
546
    AVProbeData probe_data;
547
#define MAX_REORDER_DELAY 16
548
    int64_t pts_buffer[MAX_REORDER_DELAY+1];
549

    
550
    /**
551
     * sample aspect ratio (0 if unknown)
552
     * - encoding: Set by user.
553
     * - decoding: Set by libavformat.
554
     */
555
    AVRational sample_aspect_ratio;
556

    
557
    AVMetadata *metadata;
558

    
559
    /* Intended mostly for av_read_frame() support. Not supposed to be used by */
560
    /* external applications; try to use something else if at all possible.    */
561
    const uint8_t *cur_ptr;
562
    int cur_len;
563
    AVPacket cur_pkt;
564

    
565
    // Timestamp generation support:
566
    /**
567
     * Timestamp corresponding to the last dts sync point.
568
     *
569
     * Initialized when AVCodecParserContext.dts_sync_point >= 0 and
570
     * a DTS is received from the underlying container. Otherwise set to
571
     * AV_NOPTS_VALUE by default.
572
     */
573
    int64_t reference_dts;
574

    
575
    /**
576
     * Number of packets to buffer for codec probing
577
     * NOT PART OF PUBLIC API
578
     */
579
#define MAX_PROBE_PACKETS 2500
580
    int probe_packets;
581

    
582
    /**
583
     * last packet in packet_buffer for this stream when muxing.
584
     * used internally, NOT PART OF PUBLIC API, dont read or write from outside of libav*
585
     */
586
    struct AVPacketList *last_in_packet_buffer;
587

    
588
    /**
589
     * Average framerate
590
     */
591
    AVRational avg_frame_rate;
592

    
593
    /**
594
     * Number of frames that have been demuxed during av_find_stream_info()
595
     */
596
    int codec_info_nb_frames;
597

    
598
    /**
599
     * Stream informations used internally by av_find_stream_info()
600
     */
601
#define MAX_STD_TIMEBASES (60*12+5)
602
    struct {
603
        int64_t last_dts;
604
        int64_t duration_gcd;
605
        int duration_count;
606
        double duration_error[MAX_STD_TIMEBASES];
607
        int64_t codec_info_duration;
608
    } *info;
609
} AVStream;
610

    
611
#define AV_PROGRAM_RUNNING 1
612

    
613
/**
614
 * New fields can be added to the end with minor version bumps.
615
 * Removal, reordering and changes to existing fields require a major
616
 * version bump.
617
 * sizeof(AVProgram) must not be used outside libav*.
618
 */
619
typedef struct AVProgram {
620
    int            id;
621
    int            flags;
622
    enum AVDiscard discard;        ///< selects which program to discard and which to feed to the caller
623
    unsigned int   *stream_index;
624
    unsigned int   nb_stream_indexes;
625
    AVMetadata *metadata;
626
} AVProgram;
627

    
628
#define AVFMTCTX_NOHEADER      0x0001 /**< signal that no header is present
629
                                         (streams are added dynamically) */
630

    
631
typedef struct AVChapter {
632
    int id;                 ///< unique ID to identify the chapter
633
    AVRational time_base;   ///< time base in which the start/end timestamps are specified
634
    int64_t start, end;     ///< chapter start/end time in time_base units
635
    AVMetadata *metadata;
636
} AVChapter;
637

    
638
/**
639
 * Format I/O context.
640
 * New fields can be added to the end with minor version bumps.
641
 * Removal, reordering and changes to existing fields require a major
642
 * version bump.
643
 * sizeof(AVFormatContext) must not be used outside libav*.
644
 */
645
typedef struct AVFormatContext {
646
    const AVClass *av_class; /**< Set by avformat_alloc_context. */
647
    /* Can only be iformat or oformat, not both at the same time. */
648
    struct AVInputFormat *iformat;
649
    struct AVOutputFormat *oformat;
650
    void *priv_data;
651
    AVIOContext *pb;
652
    unsigned int nb_streams;
653
    AVStream **streams;
654
    char filename[1024]; /**< input or output filename */
655
    /* stream info */
656
    int64_t timestamp;
657

    
658
    int ctx_flags; /**< Format-specific flags, see AVFMTCTX_xx */
659
    /* private data for pts handling (do not modify directly). */
660
    /**
661
     * This buffer is only needed when packets were already buffered but
662
     * not decoded, for example to get the codec parameters in MPEG
663
     * streams.
664
     */
665
    struct AVPacketList *packet_buffer;
666

    
667
    /**
668
     * Decoding: position of the first frame of the component, in
669
     * AV_TIME_BASE fractional seconds. NEVER set this value directly:
670
     * It is deduced from the AVStream values.
671
     */
672
    int64_t start_time;
673

    
674
    /**
675
     * Decoding: duration of the stream, in AV_TIME_BASE fractional
676
     * seconds. Only set this value if you know none of the individual stream
677
     * durations and also dont set any of them. This is deduced from the
678
     * AVStream values if not set.
679
     */
680
    int64_t duration;
681

    
682
    /**
683
     * decoding: total file size, 0 if unknown
684
     */
685
    int64_t file_size;
686

    
687
    /**
688
     * Decoding: total stream bitrate in bit/s, 0 if not
689
     * available. Never set it directly if the file_size and the
690
     * duration are known as Libav can compute it automatically.
691
     */
692
    int bit_rate;
693

    
694
    /* av_read_frame() support */
695
    AVStream *cur_st;
696

    
697
    /* av_seek_frame() support */
698
    int64_t data_offset; /**< offset of the first packet */
699

    
700
    int mux_rate;
701
    unsigned int packet_size;
702
    int preload;
703
    int max_delay;
704

    
705
#define AVFMT_NOOUTPUTLOOP -1
706
#define AVFMT_INFINITEOUTPUTLOOP 0
707
    /**
708
     * number of times to loop output in formats that support it
709
     */
710
    int loop_output;
711

    
712
    int flags;
713
#define AVFMT_FLAG_GENPTS       0x0001 ///< Generate missing pts even if it requires parsing future frames.
714
#define AVFMT_FLAG_IGNIDX       0x0002 ///< Ignore index.
715
#define AVFMT_FLAG_NONBLOCK     0x0004 ///< Do not block when reading packets from input.
716
#define AVFMT_FLAG_IGNDTS       0x0008 ///< Ignore DTS on frames that contain both DTS & PTS
717
#define AVFMT_FLAG_NOFILLIN     0x0010 ///< Do not infer any values from other values, just return what is stored in the container
718
#define AVFMT_FLAG_NOPARSE      0x0020 ///< Do not use AVParsers, you also must set AVFMT_FLAG_NOFILLIN as the fillin code works on frames and no parsing -> no frames. Also seeking to frames can not work if parsing to find frame boundaries has been disabled
719
#define AVFMT_FLAG_RTP_HINT     0x0040 ///< Add RTP hinting to the output file
720

    
721
    int loop_input;
722

    
723
    /**
724
     * decoding: size of data to probe; encoding: unused.
725
     */
726
    unsigned int probesize;
727

    
728
    /**
729
     * Maximum time (in AV_TIME_BASE units) during which the input should
730
     * be analyzed in av_find_stream_info().
731
     */
732
    int max_analyze_duration;
733

    
734
    const uint8_t *key;
735
    int keylen;
736

    
737
    unsigned int nb_programs;
738
    AVProgram **programs;
739

    
740
    /**
741
     * Forced video codec_id.
742
     * Demuxing: Set by user.
743
     */
744
    enum CodecID video_codec_id;
745

    
746
    /**
747
     * Forced audio codec_id.
748
     * Demuxing: Set by user.
749
     */
750
    enum CodecID audio_codec_id;
751

    
752
    /**
753
     * Forced subtitle codec_id.
754
     * Demuxing: Set by user.
755
     */
756
    enum CodecID subtitle_codec_id;
757

    
758
    /**
759
     * Maximum amount of memory in bytes to use for the index of each stream.
760
     * If the index exceeds this size, entries will be discarded as
761
     * needed to maintain a smaller size. This can lead to slower or less
762
     * accurate seeking (depends on demuxer).
763
     * Demuxers for which a full in-memory index is mandatory will ignore
764
     * this.
765
     * muxing  : unused
766
     * demuxing: set by user
767
     */
768
    unsigned int max_index_size;
769

    
770
    /**
771
     * Maximum amount of memory in bytes to use for buffering frames
772
     * obtained from realtime capture devices.
773
     */
774
    unsigned int max_picture_buffer;
775

    
776
    unsigned int nb_chapters;
777
    AVChapter **chapters;
778

    
779
    /**
780
     * Flags to enable debugging.
781
     */
782
    int debug;
783
#define FF_FDEBUG_TS        0x0001
784

    
785
    /**
786
     * Raw packets from the demuxer, prior to parsing and decoding.
787
     * This buffer is used for buffering packets until the codec can
788
     * be identified, as parsing cannot be done without knowing the
789
     * codec.
790
     */
791
    struct AVPacketList *raw_packet_buffer;
792
    struct AVPacketList *raw_packet_buffer_end;
793

    
794
    struct AVPacketList *packet_buffer_end;
795

    
796
    AVMetadata *metadata;
797

    
798
    /**
799
     * Remaining size available for raw_packet_buffer, in bytes.
800
     * NOT PART OF PUBLIC API
801
     */
802
#define RAW_PACKET_BUFFER_SIZE 2500000
803
    int raw_packet_buffer_remaining_size;
804

    
805
    /**
806
     * Start time of the stream in real world time, in microseconds
807
     * since the unix epoch (00:00 1st January 1970). That is, pts=0
808
     * in the stream was captured at this real world time.
809
     * - encoding: Set by user.
810
     * - decoding: Unused.
811
     */
812
    int64_t start_time_realtime;
813
} AVFormatContext;
814

    
815
typedef struct AVPacketList {
816
    AVPacket pkt;
817
    struct AVPacketList *next;
818
} AVPacketList;
819

    
820
/**
821
 * If f is NULL, returns the first registered input format,
822
 * if f is non-NULL, returns the next registered input format after f
823
 * or NULL if f is the last one.
824
 */
825
AVInputFormat  *av_iformat_next(AVInputFormat  *f);
826

    
827
/**
828
 * If f is NULL, returns the first registered output format,
829
 * if f is non-NULL, returns the next registered output format after f
830
 * or NULL if f is the last one.
831
 */
832
AVOutputFormat *av_oformat_next(AVOutputFormat *f);
833

    
834
#if FF_API_GUESS_IMG2_CODEC
835
attribute_deprecated enum CodecID av_guess_image2_codec(const char *filename);
836
#endif
837

    
838
/* XXX: Use automatic init with either ELF sections or C file parser */
839
/* modules. */
840

    
841
/* utils.c */
842
void av_register_input_format(AVInputFormat *format);
843
void av_register_output_format(AVOutputFormat *format);
844

    
845
/**
846
 * Return the output format in the list of registered output formats
847
 * which best matches the provided parameters, or return NULL if
848
 * there is no match.
849
 *
850
 * @param short_name if non-NULL checks if short_name matches with the
851
 * names of the registered formats
852
 * @param filename if non-NULL checks if filename terminates with the
853
 * extensions of the registered formats
854
 * @param mime_type if non-NULL checks if mime_type matches with the
855
 * MIME type of the registered formats
856
 */
857
AVOutputFormat *av_guess_format(const char *short_name,
858
                                const char *filename,
859
                                const char *mime_type);
860

    
861
/**
862
 * Guess the codec ID based upon muxer and filename.
863
 */
864
enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
865
                            const char *filename, const char *mime_type,
866
                            enum AVMediaType type);
867

    
868
/**
869
 * Send a nice hexadecimal dump of a buffer to the specified file stream.
870
 *
871
 * @param f The file stream pointer where the dump should be sent to.
872
 * @param buf buffer
873
 * @param size buffer size
874
 *
875
 * @see av_hex_dump_log, av_pkt_dump2, av_pkt_dump_log2
876
 */
877
void av_hex_dump(FILE *f, uint8_t *buf, int size);
878

    
879
/**
880
 * Send a nice hexadecimal dump of a buffer to the log.
881
 *
882
 * @param avcl A pointer to an arbitrary struct of which the first field is a
883
 * pointer to an AVClass struct.
884
 * @param level The importance level of the message, lower values signifying
885
 * higher importance.
886
 * @param buf buffer
887
 * @param size buffer size
888
 *
889
 * @see av_hex_dump, av_pkt_dump2, av_pkt_dump_log2
890
 */
891
void av_hex_dump_log(void *avcl, int level, uint8_t *buf, int size);
892

    
893
/**
894
 * Send a nice dump of a packet to the specified file stream.
895
 *
896
 * @param f The file stream pointer where the dump should be sent to.
897
 * @param pkt packet to dump
898
 * @param dump_payload True if the payload must be displayed, too.
899
 * @param st AVStream that the packet belongs to
900
 */
901
void av_pkt_dump2(FILE *f, AVPacket *pkt, int dump_payload, AVStream *st);
902

    
903

    
904
/**
905
 * Send a nice dump of a packet to the log.
906
 *
907
 * @param avcl A pointer to an arbitrary struct of which the first field is a
908
 * pointer to an AVClass struct.
909
 * @param level The importance level of the message, lower values signifying
910
 * higher importance.
911
 * @param pkt packet to dump
912
 * @param dump_payload True if the payload must be displayed, too.
913
 * @param st AVStream that the packet belongs to
914
 */
915
void av_pkt_dump_log2(void *avcl, int level, AVPacket *pkt, int dump_payload,
916
                      AVStream *st);
917

    
918
#if FF_API_PKT_DUMP
919
attribute_deprecated void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
920
attribute_deprecated void av_pkt_dump_log(void *avcl, int level, AVPacket *pkt,
921
                                          int dump_payload);
922
#endif
923

    
924
/**
925
 * Initialize libavformat and register all the muxers, demuxers and
926
 * protocols. If you do not call this function, then you can select
927
 * exactly which formats you want to support.
928
 *
929
 * @see av_register_input_format()
930
 * @see av_register_output_format()
931
 * @see av_register_protocol()
932
 */
933
void av_register_all(void);
934

    
935
/**
936
 * Get the CodecID for the given codec tag tag.
937
 * If no codec id is found returns CODEC_ID_NONE.
938
 *
939
 * @param tags list of supported codec_id-codec_tag pairs, as stored
940
 * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
941
 */
942
enum CodecID av_codec_get_id(const struct AVCodecTag * const *tags, unsigned int tag);
943

    
944
/**
945
 * Get the codec tag for the given codec id id.
946
 * If no codec tag is found returns 0.
947
 *
948
 * @param tags list of supported codec_id-codec_tag pairs, as stored
949
 * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
950
 */
951
unsigned int av_codec_get_tag(const struct AVCodecTag * const *tags, enum CodecID id);
952

    
953
/* media file input */
954

    
955
/**
956
 * Find AVInputFormat based on the short name of the input format.
957
 */
958
AVInputFormat *av_find_input_format(const char *short_name);
959

    
960
/**
961
 * Guess the file format.
962
 *
963
 * @param is_opened Whether the file is already opened; determines whether
964
 *                  demuxers with or without AVFMT_NOFILE are probed.
965
 */
966
AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
967

    
968
/**
969
 * Guess the file format.
970
 *
971
 * @param is_opened Whether the file is already opened; determines whether
972
 *                  demuxers with or without AVFMT_NOFILE are probed.
973
 * @param score_max A probe score larger that this is required to accept a
974
 *                  detection, the variable is set to the actual detection
975
 *                  score afterwards.
976
 *                  If the score is <= AVPROBE_SCORE_MAX / 4 it is recommended
977
 *                  to retry with a larger probe buffer.
978
 */
979
AVInputFormat *av_probe_input_format2(AVProbeData *pd, int is_opened, int *score_max);
980

    
981
/**
982
 * Probe a bytestream to determine the input format. Each time a probe returns
983
 * with a score that is too low, the probe buffer size is increased and another
984
 * attempt is made. When the maximum probe size is reached, the input format
985
 * with the highest score is returned.
986
 *
987
 * @param pb the bytestream to probe
988
 * @param fmt the input format is put here
989
 * @param filename the filename of the stream
990
 * @param logctx the log context
991
 * @param offset the offset within the bytestream to probe from
992
 * @param max_probe_size the maximum probe buffer size (zero for default)
993
 * @return 0 in case of success, a negative value corresponding to an
994
 * AVERROR code otherwise
995
 */
996
int av_probe_input_buffer(AVIOContext *pb, AVInputFormat **fmt,
997
                          const char *filename, void *logctx,
998
                          unsigned int offset, unsigned int max_probe_size);
999

    
1000
/**
1001
 * Allocate all the structures needed to read an input stream.
1002
 *        This does not open the needed codecs for decoding the stream[s].
1003
 */
1004
int av_open_input_stream(AVFormatContext **ic_ptr,
1005
                         AVIOContext *pb, const char *filename,
1006
                         AVInputFormat *fmt, AVFormatParameters *ap);
1007

    
1008
/**
1009
 * Open a media file as input. The codecs are not opened. Only the file
1010
 * header (if present) is read.
1011
 *
1012
 * @param ic_ptr The opened media file handle is put here.
1013
 * @param filename filename to open
1014
 * @param fmt If non-NULL, force the file format to use.
1015
 * @param buf_size optional buffer size (zero if default is OK)
1016
 * @param ap Additional parameters needed when opening the file
1017
 *           (NULL if default).
1018
 * @return 0 if OK, AVERROR_xxx otherwise
1019
 */
1020
int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
1021
                       AVInputFormat *fmt,
1022
                       int buf_size,
1023
                       AVFormatParameters *ap);
1024

    
1025
/**
1026
 * Allocate an AVFormatContext.
1027
 * avformat_free_context() can be used to free the context and everything
1028
 * allocated by the framework within it.
1029
 */
1030
AVFormatContext *avformat_alloc_context(void);
1031

    
1032
/**
1033
 * Read packets of a media file to get stream information. This
1034
 * is useful for file formats with no headers such as MPEG. This
1035
 * function also computes the real framerate in case of MPEG-2 repeat
1036
 * frame mode.
1037
 * The logical file position is not changed by this function;
1038
 * examined packets may be buffered for later processing.
1039
 *
1040
 * @param ic media file handle
1041
 * @return >=0 if OK, AVERROR_xxx on error
1042
 * @todo Let the user decide somehow what information is needed so that
1043
 *       we do not waste time getting stuff the user does not need.
1044
 */
1045
int av_find_stream_info(AVFormatContext *ic);
1046

    
1047
/**
1048
 * Find the "best" stream in the file.
1049
 * The best stream is determined according to various heuristics as the most
1050
 * likely to be what the user expects.
1051
 * If the decoder parameter is non-NULL, av_find_best_stream will find the
1052
 * default decoder for the stream's codec; streams for which no decoder can
1053
 * be found are ignored.
1054
 *
1055
 * @param ic                media file handle
1056
 * @param type              stream type: video, audio, subtitles, etc.
1057
 * @param wanted_stream_nb  user-requested stream number,
1058
 *                          or -1 for automatic selection
1059
 * @param related_stream    try to find a stream related (eg. in the same
1060
 *                          program) to this one, or -1 if none
1061
 * @param decoder_ret       if non-NULL, returns the decoder for the
1062
 *                          selected stream
1063
 * @param flags             flags; none are currently defined
1064
 * @return  the non-negative stream number in case of success,
1065
 *          AVERROR_STREAM_NOT_FOUND if no stream with the requested type
1066
 *          could be found,
1067
 *          AVERROR_DECODER_NOT_FOUND if streams were found but no decoder
1068
 * @note  If av_find_best_stream returns successfully and decoder_ret is not
1069
 *        NULL, then *decoder_ret is guaranteed to be set to a valid AVCodec.
1070
 */
1071
int av_find_best_stream(AVFormatContext *ic,
1072
                        enum AVMediaType type,
1073
                        int wanted_stream_nb,
1074
                        int related_stream,
1075
                        AVCodec **decoder_ret,
1076
                        int flags);
1077

    
1078
/**
1079
 * Read a transport packet from a media file.
1080
 *
1081
 * This function is obsolete and should never be used.
1082
 * Use av_read_frame() instead.
1083
 *
1084
 * @param s media file handle
1085
 * @param pkt is filled
1086
 * @return 0 if OK, AVERROR_xxx on error
1087
 */
1088
int av_read_packet(AVFormatContext *s, AVPacket *pkt);
1089

    
1090
/**
1091
 * Return the next frame of a stream.
1092
 * This function returns what is stored in the file, and does not validate
1093
 * that what is there are valid frames for the decoder. It will split what is
1094
 * stored in the file into frames and return one for each call. It will not
1095
 * omit invalid data between valid frames so as to give the decoder the maximum
1096
 * information possible for decoding.
1097
 *
1098
 * The returned packet is valid
1099
 * until the next av_read_frame() or until av_close_input_file() and
1100
 * must be freed with av_free_packet. For video, the packet contains
1101
 * exactly one frame. For audio, it contains an integer number of
1102
 * frames if each frame has a known fixed size (e.g. PCM or ADPCM
1103
 * data). If the audio frames have a variable size (e.g. MPEG audio),
1104
 * then it contains one frame.
1105
 *
1106
 * pkt->pts, pkt->dts and pkt->duration are always set to correct
1107
 * values in AVStream.time_base units (and guessed if the format cannot
1108
 * provide them). pkt->pts can be AV_NOPTS_VALUE if the video format
1109
 * has B-frames, so it is better to rely on pkt->dts if you do not
1110
 * decompress the payload.
1111
 *
1112
 * @return 0 if OK, < 0 on error or end of file
1113
 */
1114
int av_read_frame(AVFormatContext *s, AVPacket *pkt);
1115

    
1116
/**
1117
 * Seek to the keyframe at timestamp.
1118
 * 'timestamp' in 'stream_index'.
1119
 * @param stream_index If stream_index is (-1), a default
1120
 * stream is selected, and timestamp is automatically converted
1121
 * from AV_TIME_BASE units to the stream specific time_base.
1122
 * @param timestamp Timestamp in AVStream.time_base units
1123
 *        or, if no stream is specified, in AV_TIME_BASE units.
1124
 * @param flags flags which select direction and seeking mode
1125
 * @return >= 0 on success
1126
 */
1127
int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp,
1128
                  int flags);
1129

    
1130
/**
1131
 * Seek to timestamp ts.
1132
 * Seeking will be done so that the point from which all active streams
1133
 * can be presented successfully will be closest to ts and within min/max_ts.
1134
 * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
1135
 *
1136
 * If flags contain AVSEEK_FLAG_BYTE, then all timestamps are in bytes and
1137
 * are the file position (this may not be supported by all demuxers).
1138
 * If flags contain AVSEEK_FLAG_FRAME, then all timestamps are in frames
1139
 * in the stream with stream_index (this may not be supported by all demuxers).
1140
 * Otherwise all timestamps are in units of the stream selected by stream_index
1141
 * or if stream_index is -1, in AV_TIME_BASE units.
1142
 * If flags contain AVSEEK_FLAG_ANY, then non-keyframes are treated as
1143
 * keyframes (this may not be supported by all demuxers).
1144
 *
1145
 * @param stream_index index of the stream which is used as time base reference
1146
 * @param min_ts smallest acceptable timestamp
1147
 * @param ts target timestamp
1148
 * @param max_ts largest acceptable timestamp
1149
 * @param flags flags
1150
 * @return >=0 on success, error code otherwise
1151
 *
1152
 * @note This is part of the new seek API which is still under construction.
1153
 *       Thus do not use this yet. It may change at any time, do not expect
1154
 *       ABI compatibility yet!
1155
 */
1156
int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
1157

    
1158
/**
1159
 * Start playing a network-based stream (e.g. RTSP stream) at the
1160
 * current position.
1161
 */
1162
int av_read_play(AVFormatContext *s);
1163

    
1164
/**
1165
 * Pause a network-based stream (e.g. RTSP stream).
1166
 *
1167
 * Use av_read_play() to resume it.
1168
 */
1169
int av_read_pause(AVFormatContext *s);
1170

    
1171
/**
1172
 * Free a AVFormatContext allocated by av_open_input_stream.
1173
 * @param s context to free
1174
 */
1175
void av_close_input_stream(AVFormatContext *s);
1176

    
1177
/**
1178
 * Close a media file (but not its codecs).
1179
 *
1180
 * @param s media file handle
1181
 */
1182
void av_close_input_file(AVFormatContext *s);
1183

    
1184
/**
1185
 * Free an AVFormatContext and all its streams.
1186
 * @param s context to free
1187
 */
1188
void avformat_free_context(AVFormatContext *s);
1189

    
1190
/**
1191
 * Add a new stream to a media file.
1192
 *
1193
 * Can only be called in the read_header() function. If the flag
1194
 * AVFMTCTX_NOHEADER is in the format context, then new streams
1195
 * can be added in read_packet too.
1196
 *
1197
 * @param s media file handle
1198
 * @param id file-format-dependent stream ID
1199
 */
1200
AVStream *av_new_stream(AVFormatContext *s, int id);
1201
AVProgram *av_new_program(AVFormatContext *s, int id);
1202

    
1203
/**
1204
 * Set the pts for a given stream. If the new values would be invalid
1205
 * (<= 0), it leaves the AVStream unchanged.
1206
 *
1207
 * @param s stream
1208
 * @param pts_wrap_bits number of bits effectively used by the pts
1209
 *        (used for wrap control, 33 is the value for MPEG)
1210
 * @param pts_num numerator to convert to seconds (MPEG: 1)
1211
 * @param pts_den denominator to convert to seconds (MPEG: 90000)
1212
 */
1213
void av_set_pts_info(AVStream *s, int pts_wrap_bits,
1214
                     unsigned int pts_num, unsigned int pts_den);
1215

    
1216
#define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
1217
#define AVSEEK_FLAG_BYTE     2 ///< seeking based on position in bytes
1218
#define AVSEEK_FLAG_ANY      4 ///< seek to any frame, even non-keyframes
1219
#define AVSEEK_FLAG_FRAME    8 ///< seeking based on frame number
1220

    
1221
int av_find_default_stream_index(AVFormatContext *s);
1222

    
1223
/**
1224
 * Get the index for a specific timestamp.
1225
 * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond
1226
 *                 to the timestamp which is <= the requested one, if backward
1227
 *                 is 0, then it will be >=
1228
 *              if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
1229
 * @return < 0 if no such timestamp could be found
1230
 */
1231
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
1232

    
1233
/**
1234
 * Add an index entry into a sorted list. Update the entry if the list
1235
 * already contains it.
1236
 *
1237
 * @param timestamp timestamp in the time base of the given stream
1238
 */
1239
int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp,
1240
                       int size, int distance, int flags);
1241

    
1242
/**
1243
 * Perform a binary search using av_index_search_timestamp() and
1244
 * AVInputFormat.read_timestamp().
1245
 * This is not supposed to be called directly by a user application,
1246
 * but by demuxers.
1247
 * @param target_ts target timestamp in the time base of the given stream
1248
 * @param stream_index stream number
1249
 */
1250
int av_seek_frame_binary(AVFormatContext *s, int stream_index,
1251
                         int64_t target_ts, int flags);
1252

    
1253
/**
1254
 * Update cur_dts of all streams based on the given timestamp and AVStream.
1255
 *
1256
 * Stream ref_st unchanged, others set cur_dts in their native time base.
1257
 * Only needed for timestamp wrapping or if (dts not set and pts!=dts).
1258
 * @param timestamp new dts expressed in time_base of param ref_st
1259
 * @param ref_st reference stream giving time_base of param timestamp
1260
 */
1261
void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
1262

    
1263
/**
1264
 * Perform a binary search using read_timestamp().
1265
 * This is not supposed to be called directly by a user application,
1266
 * but by demuxers.
1267
 * @param target_ts target timestamp in the time base of the given stream
1268
 * @param stream_index stream number
1269
 */
1270
int64_t av_gen_search(AVFormatContext *s, int stream_index,
1271
                      int64_t target_ts, int64_t pos_min,
1272
                      int64_t pos_max, int64_t pos_limit,
1273
                      int64_t ts_min, int64_t ts_max,
1274
                      int flags, int64_t *ts_ret,
1275
                      int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
1276

    
1277
/**
1278
 * media file output
1279
 */
1280
int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
1281

    
1282
/**
1283
 * Split a URL string into components.
1284
 *
1285
 * The pointers to buffers for storing individual components may be null,
1286
 * in order to ignore that component. Buffers for components not found are
1287
 * set to empty strings. If the port is not found, it is set to a negative
1288
 * value.
1289
 *
1290
 * @param proto the buffer for the protocol
1291
 * @param proto_size the size of the proto buffer
1292
 * @param authorization the buffer for the authorization
1293
 * @param authorization_size the size of the authorization buffer
1294
 * @param hostname the buffer for the host name
1295
 * @param hostname_size the size of the hostname buffer
1296
 * @param port_ptr a pointer to store the port number in
1297
 * @param path the buffer for the path
1298
 * @param path_size the size of the path buffer
1299
 * @param url the URL to split
1300
 */
1301
void av_url_split(char *proto,         int proto_size,
1302
                  char *authorization, int authorization_size,
1303
                  char *hostname,      int hostname_size,
1304
                  int *port_ptr,
1305
                  char *path,          int path_size,
1306
                  const char *url);
1307

    
1308
/**
1309
 * Allocate the stream private data and write the stream header to an
1310
 * output media file.
1311
 * @note: this sets stream time-bases, if possible to stream->codec->time_base
1312
 * but for some formats it might also be some other time base
1313
 *
1314
 * @param s media file handle
1315
 * @return 0 if OK, AVERROR_xxx on error
1316
 */
1317
int av_write_header(AVFormatContext *s);
1318

    
1319
/**
1320
 * Write a packet to an output media file.
1321
 *
1322
 * The packet shall contain one audio or video frame.
1323
 * The packet must be correctly interleaved according to the container
1324
 * specification, if not then av_interleaved_write_frame must be used.
1325
 *
1326
 * @param s media file handle
1327
 * @param pkt The packet, which contains the stream_index, buf/buf_size,
1328
              dts/pts, ...
1329
 * @return < 0 on error, = 0 if OK, 1 if end of stream wanted
1330
 */
1331
int av_write_frame(AVFormatContext *s, AVPacket *pkt);
1332

    
1333
/**
1334
 * Write a packet to an output media file ensuring correct interleaving.
1335
 *
1336
 * The packet must contain one audio or video frame.
1337
 * If the packets are already correctly interleaved, the application should
1338
 * call av_write_frame() instead as it is slightly faster. It is also important
1339
 * to keep in mind that completely non-interleaved input will need huge amounts
1340
 * of memory to interleave with this, so it is preferable to interleave at the
1341
 * demuxer level.
1342
 *
1343
 * @param s media file handle
1344
 * @param pkt The packet, which contains the stream_index, buf/buf_size,
1345
              dts/pts, ...
1346
 * @return < 0 on error, = 0 if OK, 1 if end of stream wanted
1347
 */
1348
int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
1349

    
1350
/**
1351
 * Interleave a packet per dts in an output media file.
1352
 *
1353
 * Packets with pkt->destruct == av_destruct_packet will be freed inside this
1354
 * function, so they cannot be used after it. Note that calling av_free_packet()
1355
 * on them is still safe.
1356
 *
1357
 * @param s media file handle
1358
 * @param out the interleaved packet will be output here
1359
 * @param pkt the input packet
1360
 * @param flush 1 if no further packets are available as input and all
1361
 *              remaining packets should be output
1362
 * @return 1 if a packet was output, 0 if no packet could be output,
1363
 *         < 0 if an error occurred
1364
 */
1365
int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
1366
                                 AVPacket *pkt, int flush);
1367

    
1368
/**
1369
 * Write the stream trailer to an output media file and free the
1370
 * file private data.
1371
 *
1372
 * May only be called after a successful call to av_write_header.
1373
 *
1374
 * @param s media file handle
1375
 * @return 0 if OK, AVERROR_xxx on error
1376
 */
1377
int av_write_trailer(AVFormatContext *s);
1378

    
1379
#if FF_API_DUMP_FORMAT
1380
attribute_deprecated void dump_format(AVFormatContext *ic,
1381
                                      int index,
1382
                                      const char *url,
1383
                                      int is_output);
1384
#endif
1385

    
1386
void av_dump_format(AVFormatContext *ic,
1387
                    int index,
1388
                    const char *url,
1389
                    int is_output);
1390

    
1391
#if FF_API_PARSE_DATE
1392
/**
1393
 * Parse datestr and return a corresponding number of microseconds.
1394
 *
1395
 * @param datestr String representing a date or a duration.
1396
 * See av_parse_time() for the syntax of the provided string.
1397
 * @deprecated in favor of av_parse_time()
1398
 */
1399
attribute_deprecated
1400
int64_t parse_date(const char *datestr, int duration);
1401
#endif
1402

    
1403
/**
1404
 * Get the current time in microseconds.
1405
 */
1406
int64_t av_gettime(void);
1407

    
1408
#if FF_API_FIND_INFO_TAG
1409
/**
1410
 * @deprecated use av_find_info_tag in libavutil instead.
1411
 */
1412
attribute_deprecated int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
1413
#endif
1414

    
1415
/**
1416
 * Return in 'buf' the path with '%d' replaced by a number.
1417
 *
1418
 * Also handles the '%0nd' format where 'n' is the total number
1419
 * of digits and '%%'.
1420
 *
1421
 * @param buf destination buffer
1422
 * @param buf_size destination buffer size
1423
 * @param path numbered sequence string
1424
 * @param number frame number
1425
 * @return 0 if OK, -1 on format error
1426
 */
1427
int av_get_frame_filename(char *buf, int buf_size,
1428
                          const char *path, int number);
1429

    
1430
/**
1431
 * Check whether filename actually is a numbered sequence generator.
1432
 *
1433
 * @param filename possible numbered sequence string
1434
 * @return 1 if a valid numbered sequence string, 0 otherwise
1435
 */
1436
int av_filename_number_test(const char *filename);
1437

    
1438
/**
1439
 * Generate an SDP for an RTP session.
1440
 *
1441
 * @param ac array of AVFormatContexts describing the RTP streams. If the
1442
 *           array is composed by only one context, such context can contain
1443
 *           multiple AVStreams (one AVStream per RTP stream). Otherwise,
1444
 *           all the contexts in the array (an AVCodecContext per RTP stream)
1445
 *           must contain only one AVStream.
1446
 * @param n_files number of AVCodecContexts contained in ac
1447
 * @param buf buffer where the SDP will be stored (must be allocated by
1448
 *            the caller)
1449
 * @param size the size of the buffer
1450
 * @return 0 if OK, AVERROR_xxx on error
1451
 */
1452
int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size);
1453

    
1454
#if FF_API_SDP_CREATE
1455
attribute_deprecated int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size);
1456
#endif
1457

    
1458
/**
1459
 * Return a positive value if the given filename has one of the given
1460
 * extensions, 0 otherwise.
1461
 *
1462
 * @param extensions a comma-separated list of filename extensions
1463
 */
1464
int av_match_ext(const char *filename, const char *extensions);
1465

    
1466
#endif /* AVFORMAT_AVFORMAT_H */