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/*
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 * copyright (c) 2001 Fabrice Bellard
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#ifndef AVFORMAT_AVFORMAT_H
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#define AVFORMAT_AVFORMAT_H
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/**
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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 FFmpeg,
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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.
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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_METADATA
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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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#if FF_API_OLD_METADATA
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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)
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 * @param value tag value to add to *pm (will be av_strduped)
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 * @return >= 0 on success otherwise an error code <0
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 * @deprecated Use av_metadata_set2() instead.
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 */
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attribute_deprecated int av_metadata_set(AVMetadata **pm, const char *key, const char *value);
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#endif
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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_METADATA
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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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#if FF_API_PARAMETERS_CODEC_ID
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    attribute_deprecated enum CodecID video_codec_id;
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    attribute_deprecated enum CodecID audio_codec_id;
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#endif
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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_GLOBALHEADER
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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_METADATA
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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
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     * (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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    /**
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     * Seek to timestamp ts.
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     * Seeking will be done so that the point from which all active streams
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     * can be presented successfully will be closest to ts and within min/max_ts.
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     * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
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     */
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    int (*read_seek2)(struct AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
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#if FF_API_OLD_METADATA
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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 */
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};
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typedef struct AVIndexEntry {
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    int64_t pos;
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    int64_t timestamp;
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#define AVINDEX_KEYFRAME 0x0001
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    int flags:2;
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    int size:30; //Yeah, trying to keep the size of this small to reduce memory requirements (it is 24 vs. 32 bytes due to possible 8-byte alignment).
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    int min_distance;         /**< Minimum distance between this and the previous keyframe, used to avoid unneeded searching. */
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} AVIndexEntry;
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#define AV_DISPOSITION_DEFAULT   0x0001
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#define AV_DISPOSITION_DUB       0x0002
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#define AV_DISPOSITION_ORIGINAL  0x0004
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#define AV_DISPOSITION_COMMENT   0x0008
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#define AV_DISPOSITION_LYRICS    0x0010
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#define AV_DISPOSITION_KARAOKE   0x0020
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/**
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 * Track should be used during playback by default.
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 * Useful for subtitle track that should be displayed
472
 * even when user did not explicitly ask for subtitles.
473
 */
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#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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/**
480
 * Stream structure.
481
 * New fields can be added to the end with minor version bumps.
482
 * Removal, reordering and changes to existing fields require a major
483
 * version bump.
484
 * sizeof(AVStream) must not be used outside libav*.
485
 */
486
typedef struct AVStream {
487
    int index;    /**< stream index in AVFormatContext */
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    int id;       /**< format-specific stream ID */
489
    AVCodecContext *codec; /**< codec context */
490
    /**
491
     * Real base framerate of the stream.
492
     * This is the lowest framerate with which all timestamps can be
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     * represented accurately (it is the least common multiple of all
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     * framerates in the stream). Note, this value is just a guess!
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     * For example, if the time base is 1/90000 and all frames have either
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     * approximately 3600 or 1800 timer ticks, then r_frame_rate will be 50/1.
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     */
498
    AVRational r_frame_rate;
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    void *priv_data;
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501
    /* internal data used in av_find_stream_info() */
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    int64_t first_dts;
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504
    /**
505
     * encoding: pts generation when outputting stream
506
     */
507
    struct AVFrac pts;
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509
    /**
510
     * This is the fundamental unit of time (in seconds) in terms
511
     * of which frame timestamps are represented. For fixed-fps content,
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     * time base should be 1/framerate and timestamp increments should be 1.
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     * decoding: set by libavformat
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     * encoding: set by libavformat in av_write_header
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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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    /**
524
     * 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
526
     */
527
    float quality;
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    /**
530
     * Decoding: pts of the first frame of the stream, in stream time base.
531
     * Only set this if you are absolutely 100% sure that the value you set
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     * it to really is the pts of the first frame.
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     * This may be undefined (AV_NOPTS_VALUE).
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     * @note The ASF header does NOT contain a correct start_time the ASF
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     * demuxer must NOT set this.
536
     */
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    int64_t start_time;
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    /**
540
     * Decoding: duration of the stream, in stream time base.
541
     * 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.
543
     */
544
    int64_t duration;
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#if FF_API_OLD_METADATA
547
    attribute_deprecated char language[4]; /**< ISO 639-2/B 3-letter language code (empty string if undefined) */
548
#endif
549

    
550
    /* av_read_frame() support */
551
    enum AVStreamParseType need_parsing;
552
    struct AVCodecParserContext *parser;
553

    
554
    int64_t cur_dts;
555
    int last_IP_duration;
556
    int64_t last_IP_pts;
557
    /* av_seek_frame() support */
558
    AVIndexEntry *index_entries; /**< Only used if the format does not
559
                                    support seeking natively. */
560
    int nb_index_entries;
561
    unsigned int index_entries_allocated_size;
562

    
563
    int64_t nb_frames;                 ///< number of frames in this stream if known or 0
564

    
565
#if FF_API_LAVF_UNUSED
566
    attribute_deprecated int64_t unused[4+1];
567
#endif
568

    
569
#if FF_API_OLD_METADATA
570
    attribute_deprecated char *filename; /**< source filename of the stream */
571
#endif
572

    
573
    int disposition; /**< AV_DISPOSITION_* bit field */
574

    
575
    AVProbeData probe_data;
576
#define MAX_REORDER_DELAY 16
577
    int64_t pts_buffer[MAX_REORDER_DELAY+1];
578

    
579
    /**
580
     * sample aspect ratio (0 if unknown)
581
     * - encoding: Set by user.
582
     * - decoding: Set by libavformat.
583
     */
584
    AVRational sample_aspect_ratio;
585

    
586
    AVMetadata *metadata;
587

    
588
    /* Intended mostly for av_read_frame() support. Not supposed to be used by */
589
    /* external applications; try to use something else if at all possible.    */
590
    const uint8_t *cur_ptr;
591
    int cur_len;
592
    AVPacket cur_pkt;
593

    
594
    // Timestamp generation support:
595
    /**
596
     * Timestamp corresponding to the last dts sync point.
597
     *
598
     * Initialized when AVCodecParserContext.dts_sync_point >= 0 and
599
     * a DTS is received from the underlying container. Otherwise set to
600
     * AV_NOPTS_VALUE by default.
601
     */
602
    int64_t reference_dts;
603

    
604
    /**
605
     * Number of packets to buffer for codec probing
606
     * NOT PART OF PUBLIC API
607
     */
608
#define MAX_PROBE_PACKETS 2500
609
    int probe_packets;
610

    
611
    /**
612
     * last packet in packet_buffer for this stream when muxing.
613
     * used internally, NOT PART OF PUBLIC API, dont read or write from outside of libav*
614
     */
615
    struct AVPacketList *last_in_packet_buffer;
616

    
617
    /**
618
     * Average framerate
619
     */
620
    AVRational avg_frame_rate;
621

    
622
    /**
623
     * Number of frames that have been demuxed during av_find_stream_info()
624
     */
625
    int codec_info_nb_frames;
626

    
627
    /**
628
     * Stream informations used internally by av_find_stream_info()
629
     */
630
#define MAX_STD_TIMEBASES (60*12+5)
631
    struct {
632
        int64_t last_dts;
633
        int64_t duration_gcd;
634
        int duration_count;
635
        double duration_error[MAX_STD_TIMEBASES];
636
        int64_t codec_info_duration;
637
    } *info;
638
} AVStream;
639

    
640
#define AV_PROGRAM_RUNNING 1
641

    
642
/**
643
 * New fields can be added to the end with minor version bumps.
644
 * Removal, reordering and changes to existing fields require a major
645
 * version bump.
646
 * sizeof(AVProgram) must not be used outside libav*.
647
 */
648
typedef struct AVProgram {
649
    int            id;
650
#if FF_API_OLD_METADATA
651
    attribute_deprecated char           *provider_name; ///< network name for DVB streams
652
    attribute_deprecated char           *name;          ///< service name for DVB streams
653
#endif
654
    int            flags;
655
    enum AVDiscard discard;        ///< selects which program to discard and which to feed to the caller
656
    unsigned int   *stream_index;
657
    unsigned int   nb_stream_indexes;
658
    AVMetadata *metadata;
659
} AVProgram;
660

    
661
#define AVFMTCTX_NOHEADER      0x0001 /**< signal that no header is present
662
                                         (streams are added dynamically) */
663

    
664
typedef struct AVChapter {
665
    int id;                 ///< unique ID to identify the chapter
666
    AVRational time_base;   ///< time base in which the start/end timestamps are specified
667
    int64_t start, end;     ///< chapter start/end time in time_base units
668
#if FF_API_OLD_METADATA
669
    attribute_deprecated char *title;            ///< chapter title
670
#endif
671
    AVMetadata *metadata;
672
} AVChapter;
673

    
674
#if FF_API_MAX_STREAMS
675
#define MAX_STREAMS 20
676
#endif
677

    
678
/**
679
 * Format I/O context.
680
 * New fields can be added to the end with minor version bumps.
681
 * Removal, reordering and changes to existing fields require a major
682
 * version bump.
683
 * sizeof(AVFormatContext) must not be used outside libav*.
684
 */
685
typedef struct AVFormatContext {
686
    const AVClass *av_class; /**< Set by avformat_alloc_context. */
687
    /* Can only be iformat or oformat, not both at the same time. */
688
    struct AVInputFormat *iformat;
689
    struct AVOutputFormat *oformat;
690
    void *priv_data;
691
    AVIOContext *pb;
692
    unsigned int nb_streams;
693
#if FF_API_MAX_STREAMS
694
    AVStream *streams[MAX_STREAMS];
695
#else
696
    AVStream **streams;
697
#endif
698
    char filename[1024]; /**< input or output filename */
699
    /* stream info */
700
    int64_t timestamp;
701
#if FF_API_OLD_METADATA
702
    attribute_deprecated char title[512];
703
    attribute_deprecated char author[512];
704
    attribute_deprecated char copyright[512];
705
    attribute_deprecated char comment[512];
706
    attribute_deprecated char album[512];
707
    attribute_deprecated int year;  /**< ID3 year, 0 if none */
708
    attribute_deprecated int track; /**< track number, 0 if none */
709
    attribute_deprecated char genre[32]; /**< ID3 genre */
710
#endif
711

    
712
    int ctx_flags; /**< Format-specific flags, see AVFMTCTX_xx */
713
    /* private data for pts handling (do not modify directly). */
714
    /**
715
     * This buffer is only needed when packets were already buffered but
716
     * not decoded, for example to get the codec parameters in MPEG
717
     * streams.
718
     */
719
    struct AVPacketList *packet_buffer;
720

    
721
    /**
722
     * Decoding: position of the first frame of the component, in
723
     * AV_TIME_BASE fractional seconds. NEVER set this value directly:
724
     * It is deduced from the AVStream values.
725
     */
726
    int64_t start_time;
727

    
728
    /**
729
     * Decoding: duration of the stream, in AV_TIME_BASE fractional
730
     * seconds. Only set this value if you know none of the individual stream
731
     * durations and also dont set any of them. This is deduced from the
732
     * AVStream values if not set.
733
     */
734
    int64_t duration;
735

    
736
    /**
737
     * decoding: total file size, 0 if unknown
738
     */
739
    int64_t file_size;
740

    
741
    /**
742
     * Decoding: total stream bitrate in bit/s, 0 if not
743
     * available. Never set it directly if the file_size and the
744
     * duration are known as FFmpeg can compute it automatically.
745
     */
746
    int bit_rate;
747

    
748
    /* av_read_frame() support */
749
    AVStream *cur_st;
750
#if FF_API_LAVF_UNUSED
751
    const uint8_t *cur_ptr_deprecated;
752
    int cur_len_deprecated;
753
    AVPacket cur_pkt_deprecated;
754
#endif
755

    
756
    /* av_seek_frame() support */
757
    int64_t data_offset; /**< offset of the first packet */
758
#if FF_API_INDEX_BUILT
759
    attribute_deprecated int index_built;
760
#endif
761

    
762
    int mux_rate;
763
    unsigned int packet_size;
764
    int preload;
765
    int max_delay;
766

    
767
#define AVFMT_NOOUTPUTLOOP -1
768
#define AVFMT_INFINITEOUTPUTLOOP 0
769
    /**
770
     * number of times to loop output in formats that support it
771
     */
772
    int loop_output;
773

    
774
    int flags;
775
#define AVFMT_FLAG_GENPTS       0x0001 ///< Generate missing pts even if it requires parsing future frames.
776
#define AVFMT_FLAG_IGNIDX       0x0002 ///< Ignore index.
777
#define AVFMT_FLAG_NONBLOCK     0x0004 ///< Do not block when reading packets from input.
778
#define AVFMT_FLAG_IGNDTS       0x0008 ///< Ignore DTS on frames that contain both DTS & PTS
779
#define AVFMT_FLAG_NOFILLIN     0x0010 ///< Do not infer any values from other values, just return what is stored in the container
780
#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
781
#define AVFMT_FLAG_RTP_HINT     0x0040 ///< Add RTP hinting to the output file
782

    
783
    int loop_input;
784

    
785
    /**
786
     * decoding: size of data to probe; encoding: unused.
787
     */
788
    unsigned int probesize;
789

    
790
    /**
791
     * Maximum time (in AV_TIME_BASE units) during which the input should
792
     * be analyzed in av_find_stream_info().
793
     */
794
    int max_analyze_duration;
795

    
796
    const uint8_t *key;
797
    int keylen;
798

    
799
    unsigned int nb_programs;
800
    AVProgram **programs;
801

    
802
    /**
803
     * Forced video codec_id.
804
     * Demuxing: Set by user.
805
     */
806
    enum CodecID video_codec_id;
807

    
808
    /**
809
     * Forced audio codec_id.
810
     * Demuxing: Set by user.
811
     */
812
    enum CodecID audio_codec_id;
813

    
814
    /**
815
     * Forced subtitle codec_id.
816
     * Demuxing: Set by user.
817
     */
818
    enum CodecID subtitle_codec_id;
819

    
820
    /**
821
     * Maximum amount of memory in bytes to use for the index of each stream.
822
     * If the index exceeds this size, entries will be discarded as
823
     * needed to maintain a smaller size. This can lead to slower or less
824
     * accurate seeking (depends on demuxer).
825
     * Demuxers for which a full in-memory index is mandatory will ignore
826
     * this.
827
     * muxing  : unused
828
     * demuxing: set by user
829
     */
830
    unsigned int max_index_size;
831

    
832
    /**
833
     * Maximum amount of memory in bytes to use for buffering frames
834
     * obtained from realtime capture devices.
835
     */
836
    unsigned int max_picture_buffer;
837

    
838
    unsigned int nb_chapters;
839
    AVChapter **chapters;
840

    
841
    /**
842
     * Flags to enable debugging.
843
     */
844
    int debug;
845
#define FF_FDEBUG_TS        0x0001
846

    
847
    /**
848
     * Raw packets from the demuxer, prior to parsing and decoding.
849
     * This buffer is used for buffering packets until the codec can
850
     * be identified, as parsing cannot be done without knowing the
851
     * codec.
852
     */
853
    struct AVPacketList *raw_packet_buffer;
854
    struct AVPacketList *raw_packet_buffer_end;
855

    
856
    struct AVPacketList *packet_buffer_end;
857

    
858
    AVMetadata *metadata;
859

    
860
    /**
861
     * Remaining size available for raw_packet_buffer, in bytes.
862
     * NOT PART OF PUBLIC API
863
     */
864
#define RAW_PACKET_BUFFER_SIZE 2500000
865
    int raw_packet_buffer_remaining_size;
866

    
867
    /**
868
     * Start time of the stream in real world time, in microseconds
869
     * since the unix epoch (00:00 1st January 1970). That is, pts=0
870
     * in the stream was captured at this real world time.
871
     * - encoding: Set by user.
872
     * - decoding: Unused.
873
     */
874
    int64_t start_time_realtime;
875
} AVFormatContext;
876

    
877
typedef struct AVPacketList {
878
    AVPacket pkt;
879
    struct AVPacketList *next;
880
} AVPacketList;
881

    
882
#if FF_API_FIRST_FORMAT
883
attribute_deprecated extern AVInputFormat *first_iformat;
884
attribute_deprecated extern AVOutputFormat *first_oformat;
885
#endif
886

    
887
/**
888
 * If f is NULL, returns the first registered input format,
889
 * if f is non-NULL, returns the next registered input format after f
890
 * or NULL if f is the last one.
891
 */
892
AVInputFormat  *av_iformat_next(AVInputFormat  *f);
893

    
894
/**
895
 * If f is NULL, returns the first registered output format,
896
 * if f is non-NULL, returns the next registered output format after f
897
 * or NULL if f is the last one.
898
 */
899
AVOutputFormat *av_oformat_next(AVOutputFormat *f);
900

    
901
enum CodecID av_guess_image2_codec(const char *filename);
902

    
903
/* XXX: Use automatic init with either ELF sections or C file parser */
904
/* modules. */
905

    
906
/* utils.c */
907
void av_register_input_format(AVInputFormat *format);
908
void av_register_output_format(AVOutputFormat *format);
909
#if FF_API_GUESS_FORMAT
910
attribute_deprecated AVOutputFormat *guess_stream_format(const char *short_name,
911
                                    const char *filename,
912
                                    const char *mime_type);
913

    
914
/**
915
 * @deprecated Use av_guess_format() instead.
916
 */
917
attribute_deprecated AVOutputFormat *guess_format(const char *short_name,
918
                                                  const char *filename,
919
                                                  const char *mime_type);
920
#endif
921

    
922
/**
923
 * Return the output format in the list of registered output formats
924
 * which best matches the provided parameters, or return NULL if
925
 * there is no match.
926
 *
927
 * @param short_name if non-NULL checks if short_name matches with the
928
 * names of the registered formats
929
 * @param filename if non-NULL checks if filename terminates with the
930
 * extensions of the registered formats
931
 * @param mime_type if non-NULL checks if mime_type matches with the
932
 * MIME type of the registered formats
933
 */
934
AVOutputFormat *av_guess_format(const char *short_name,
935
                                const char *filename,
936
                                const char *mime_type);
937

    
938
/**
939
 * Guess the codec ID based upon muxer and filename.
940
 */
941
enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
942
                            const char *filename, const char *mime_type,
943
                            enum AVMediaType type);
944

    
945
/**
946
 * Send a nice hexadecimal dump of a buffer to the specified file stream.
947
 *
948
 * @param f The file stream pointer where the dump should be sent to.
949
 * @param buf buffer
950
 * @param size buffer size
951
 *
952
 * @see av_hex_dump_log, av_pkt_dump, av_pkt_dump_log
953
 */
954
void av_hex_dump(FILE *f, uint8_t *buf, int size);
955

    
956
/**
957
 * Send a nice hexadecimal dump of a buffer to the log.
958
 *
959
 * @param avcl A pointer to an arbitrary struct of which the first field is a
960
 * pointer to an AVClass struct.
961
 * @param level The importance level of the message, lower values signifying
962
 * higher importance.
963
 * @param buf buffer
964
 * @param size buffer size
965
 *
966
 * @see av_hex_dump, av_pkt_dump, av_pkt_dump_log
967
 */
968
void av_hex_dump_log(void *avcl, int level, uint8_t *buf, int size);
969

    
970
/**
971
 * Send a nice dump of a packet to the specified file stream.
972
 *
973
 * @param f The file stream pointer where the dump should be sent to.
974
 * @param pkt packet to dump
975
 * @param dump_payload True if the payload must be displayed, too.
976
 */
977
void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
978

    
979
/**
980
 * Send a nice dump of a packet to the log.
981
 *
982
 * @param avcl A pointer to an arbitrary struct of which the first field is a
983
 * pointer to an AVClass struct.
984
 * @param level The importance level of the message, lower values signifying
985
 * higher importance.
986
 * @param pkt packet to dump
987
 * @param dump_payload True if the payload must be displayed, too.
988
 */
989
void av_pkt_dump_log(void *avcl, int level, AVPacket *pkt, int dump_payload);
990

    
991
/**
992
 * Initialize libavformat and register all the muxers, demuxers and
993
 * protocols. If you do not call this function, then you can select
994
 * exactly which formats you want to support.
995
 *
996
 * @see av_register_input_format()
997
 * @see av_register_output_format()
998
 * @see av_register_protocol()
999
 */
1000
void av_register_all(void);
1001

    
1002
/**
1003
 * Get the CodecID for the given codec tag tag.
1004
 * If no codec id is found returns CODEC_ID_NONE.
1005
 *
1006
 * @param tags list of supported codec_id-codec_tag pairs, as stored
1007
 * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
1008
 */
1009
enum CodecID av_codec_get_id(const struct AVCodecTag * const *tags, unsigned int tag);
1010

    
1011
/**
1012
 * Get the codec tag for the given codec id id.
1013
 * If no codec tag is found returns 0.
1014
 *
1015
 * @param tags list of supported codec_id-codec_tag pairs, as stored
1016
 * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
1017
 */
1018
unsigned int av_codec_get_tag(const struct AVCodecTag * const *tags, enum CodecID id);
1019

    
1020
/* media file input */
1021

    
1022
/**
1023
 * Find AVInputFormat based on the short name of the input format.
1024
 */
1025
AVInputFormat *av_find_input_format(const char *short_name);
1026

    
1027
/**
1028
 * Guess the file format.
1029
 *
1030
 * @param is_opened Whether the file is already opened; determines whether
1031
 *                  demuxers with or without AVFMT_NOFILE are probed.
1032
 */
1033
AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
1034

    
1035
/**
1036
 * Guess the file format.
1037
 *
1038
 * @param is_opened Whether the file is already opened; determines whether
1039
 *                  demuxers with or without AVFMT_NOFILE are probed.
1040
 * @param score_max A probe score larger that this is required to accept a
1041
 *                  detection, the variable is set to the actual detection
1042
 *                  score afterwards.
1043
 *                  If the score is <= AVPROBE_SCORE_MAX / 4 it is recommended
1044
 *                  to retry with a larger probe buffer.
1045
 */
1046
AVInputFormat *av_probe_input_format2(AVProbeData *pd, int is_opened, int *score_max);
1047

    
1048
/**
1049
 * Probe a bytestream to determine the input format. Each time a probe returns
1050
 * with a score that is too low, the probe buffer size is increased and another
1051
 * attempt is made. When the maximum probe size is reached, the input format
1052
 * with the highest score is returned.
1053
 *
1054
 * @param pb the bytestream to probe
1055
 * @param fmt the input format is put here
1056
 * @param filename the filename of the stream
1057
 * @param logctx the log context
1058
 * @param offset the offset within the bytestream to probe from
1059
 * @param max_probe_size the maximum probe buffer size (zero for default)
1060
 * @return 0 in case of success, a negative value corresponding to an
1061
 * AVERROR code otherwise
1062
 */
1063
int av_probe_input_buffer(AVIOContext *pb, AVInputFormat **fmt,
1064
                          const char *filename, void *logctx,
1065
                          unsigned int offset, unsigned int max_probe_size);
1066

    
1067
/**
1068
 * Allocate all the structures needed to read an input stream.
1069
 *        This does not open the needed codecs for decoding the stream[s].
1070
 */
1071
int av_open_input_stream(AVFormatContext **ic_ptr,
1072
                         AVIOContext *pb, const char *filename,
1073
                         AVInputFormat *fmt, AVFormatParameters *ap);
1074

    
1075
/**
1076
 * Open a media file as input. The codecs are not opened. Only the file
1077
 * header (if present) is read.
1078
 *
1079
 * @param ic_ptr The opened media file handle is put here.
1080
 * @param filename filename to open
1081
 * @param fmt If non-NULL, force the file format to use.
1082
 * @param buf_size optional buffer size (zero if default is OK)
1083
 * @param ap Additional parameters needed when opening the file
1084
 *           (NULL if default).
1085
 * @return 0 if OK, AVERROR_xxx otherwise
1086
 */
1087
int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
1088
                       AVInputFormat *fmt,
1089
                       int buf_size,
1090
                       AVFormatParameters *ap);
1091

    
1092
#if FF_API_ALLOC_FORMAT_CONTEXT
1093
/**
1094
 * @deprecated Use avformat_alloc_context() instead.
1095
 */
1096
attribute_deprecated AVFormatContext *av_alloc_format_context(void);
1097
#endif
1098

    
1099
/**
1100
 * Allocate an AVFormatContext.
1101
 * avformat_free_context() can be used to free the context and everything
1102
 * allocated by the framework within it.
1103
 */
1104
AVFormatContext *avformat_alloc_context(void);
1105

    
1106
/**
1107
 * Read packets of a media file to get stream information. This
1108
 * is useful for file formats with no headers such as MPEG. This
1109
 * function also computes the real framerate in case of MPEG-2 repeat
1110
 * frame mode.
1111
 * The logical file position is not changed by this function;
1112
 * examined packets may be buffered for later processing.
1113
 *
1114
 * @param ic media file handle
1115
 * @return >=0 if OK, AVERROR_xxx on error
1116
 * @todo Let the user decide somehow what information is needed so that
1117
 *       we do not waste time getting stuff the user does not need.
1118
 */
1119
int av_find_stream_info(AVFormatContext *ic);
1120

    
1121
/**
1122
 * Find the "best" stream in the file.
1123
 * The best stream is determined according to various heuristics as the most
1124
 * likely to be what the user expects.
1125
 * If the decoder parameter is non-NULL, av_find_best_stream will find the
1126
 * default decoder for the stream's codec; streams for which no decoder can
1127
 * be found are ignored.
1128
 *
1129
 * @param ic                media file handle
1130
 * @param type              stream type: video, audio, subtitles, etc.
1131
 * @param wanted_stream_nb  user-requested stream number,
1132
 *                          or -1 for automatic selection
1133
 * @param related_stream    try to find a stream related (eg. in the same
1134
 *                          program) to this one, or -1 if none
1135
 * @param decoder_ret       if non-NULL, returns the decoder for the
1136
 *                          selected stream
1137
 * @param flags             flags; none are currently defined
1138
 * @return  the non-negative stream number in case of success,
1139
 *          AVERROR_STREAM_NOT_FOUND if no stream with the requested type
1140
 *          could be found,
1141
 *          AVERROR_DECODER_NOT_FOUND if streams were found but no decoder
1142
 * @note  If av_find_best_stream returns successfully and decoder_ret is not
1143
 *        NULL, then *decoder_ret is guaranteed to be set to a valid AVCodec.
1144
 */
1145
int av_find_best_stream(AVFormatContext *ic,
1146
                        enum AVMediaType type,
1147
                        int wanted_stream_nb,
1148
                        int related_stream,
1149
                        AVCodec **decoder_ret,
1150
                        int flags);
1151

    
1152
/**
1153
 * Read a transport packet from a media file.
1154
 *
1155
 * This function is obsolete and should never be used.
1156
 * Use av_read_frame() instead.
1157
 *
1158
 * @param s media file handle
1159
 * @param pkt is filled
1160
 * @return 0 if OK, AVERROR_xxx on error
1161
 */
1162
int av_read_packet(AVFormatContext *s, AVPacket *pkt);
1163

    
1164
/**
1165
 * Return the next frame of a stream.
1166
 * This function returns what is stored in the file, and does not validate
1167
 * that what is there are valid frames for the decoder. It will split what is
1168
 * stored in the file into frames and return one for each call. It will not
1169
 * omit invalid data between valid frames so as to give the decoder the maximum
1170
 * information possible for decoding.
1171
 *
1172
 * The returned packet is valid
1173
 * until the next av_read_frame() or until av_close_input_file() and
1174
 * must be freed with av_free_packet. For video, the packet contains
1175
 * exactly one frame. For audio, it contains an integer number of
1176
 * frames if each frame has a known fixed size (e.g. PCM or ADPCM
1177
 * data). If the audio frames have a variable size (e.g. MPEG audio),
1178
 * then it contains one frame.
1179
 *
1180
 * pkt->pts, pkt->dts and pkt->duration are always set to correct
1181
 * values in AVStream.time_base units (and guessed if the format cannot
1182
 * provide them). pkt->pts can be AV_NOPTS_VALUE if the video format
1183
 * has B-frames, so it is better to rely on pkt->dts if you do not
1184
 * decompress the payload.
1185
 *
1186
 * @return 0 if OK, < 0 on error or end of file
1187
 */
1188
int av_read_frame(AVFormatContext *s, AVPacket *pkt);
1189

    
1190
/**
1191
 * Seek to the keyframe at timestamp.
1192
 * 'timestamp' in 'stream_index'.
1193
 * @param stream_index If stream_index is (-1), a default
1194
 * stream is selected, and timestamp is automatically converted
1195
 * from AV_TIME_BASE units to the stream specific time_base.
1196
 * @param timestamp Timestamp in AVStream.time_base units
1197
 *        or, if no stream is specified, in AV_TIME_BASE units.
1198
 * @param flags flags which select direction and seeking mode
1199
 * @return >= 0 on success
1200
 */
1201
int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp,
1202
                  int flags);
1203

    
1204
/**
1205
 * Seek to timestamp ts.
1206
 * Seeking will be done so that the point from which all active streams
1207
 * can be presented successfully will be closest to ts and within min/max_ts.
1208
 * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
1209
 *
1210
 * If flags contain AVSEEK_FLAG_BYTE, then all timestamps are in bytes and
1211
 * are the file position (this may not be supported by all demuxers).
1212
 * If flags contain AVSEEK_FLAG_FRAME, then all timestamps are in frames
1213
 * in the stream with stream_index (this may not be supported by all demuxers).
1214
 * Otherwise all timestamps are in units of the stream selected by stream_index
1215
 * or if stream_index is -1, in AV_TIME_BASE units.
1216
 * If flags contain AVSEEK_FLAG_ANY, then non-keyframes are treated as
1217
 * keyframes (this may not be supported by all demuxers).
1218
 *
1219
 * @param stream_index index of the stream which is used as time base reference
1220
 * @param min_ts smallest acceptable timestamp
1221
 * @param ts target timestamp
1222
 * @param max_ts largest acceptable timestamp
1223
 * @param flags flags
1224
 * @return >=0 on success, error code otherwise
1225
 *
1226
 * @note This is part of the new seek API which is still under construction.
1227
 *       Thus do not use this yet. It may change at any time, do not expect
1228
 *       ABI compatibility yet!
1229
 */
1230
int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
1231

    
1232
/**
1233
 * Start playing a network-based stream (e.g. RTSP stream) at the
1234
 * current position.
1235
 */
1236
int av_read_play(AVFormatContext *s);
1237

    
1238
/**
1239
 * Pause a network-based stream (e.g. RTSP stream).
1240
 *
1241
 * Use av_read_play() to resume it.
1242
 */
1243
int av_read_pause(AVFormatContext *s);
1244

    
1245
/**
1246
 * Free a AVFormatContext allocated by av_open_input_stream.
1247
 * @param s context to free
1248
 */
1249
void av_close_input_stream(AVFormatContext *s);
1250

    
1251
/**
1252
 * Close a media file (but not its codecs).
1253
 *
1254
 * @param s media file handle
1255
 */
1256
void av_close_input_file(AVFormatContext *s);
1257

    
1258
/**
1259
 * Free an AVFormatContext and all its streams.
1260
 * @param s context to free
1261
 */
1262
void avformat_free_context(AVFormatContext *s);
1263

    
1264
/**
1265
 * Add a new stream to a media file.
1266
 *
1267
 * Can only be called in the read_header() function. If the flag
1268
 * AVFMTCTX_NOHEADER is in the format context, then new streams
1269
 * can be added in read_packet too.
1270
 *
1271
 * @param s media file handle
1272
 * @param id file-format-dependent stream ID
1273
 */
1274
AVStream *av_new_stream(AVFormatContext *s, int id);
1275
AVProgram *av_new_program(AVFormatContext *s, int id);
1276

    
1277
/**
1278
 * Set the pts for a given stream. If the new values would be invalid
1279
 * (<= 0), it leaves the AVStream unchanged.
1280
 *
1281
 * @param s stream
1282
 * @param pts_wrap_bits number of bits effectively used by the pts
1283
 *        (used for wrap control, 33 is the value for MPEG)
1284
 * @param pts_num numerator to convert to seconds (MPEG: 1)
1285
 * @param pts_den denominator to convert to seconds (MPEG: 90000)
1286
 */
1287
void av_set_pts_info(AVStream *s, int pts_wrap_bits,
1288
                     unsigned int pts_num, unsigned int pts_den);
1289

    
1290
#define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
1291
#define AVSEEK_FLAG_BYTE     2 ///< seeking based on position in bytes
1292
#define AVSEEK_FLAG_ANY      4 ///< seek to any frame, even non-keyframes
1293
#define AVSEEK_FLAG_FRAME    8 ///< seeking based on frame number
1294

    
1295
int av_find_default_stream_index(AVFormatContext *s);
1296

    
1297
/**
1298
 * Get the index for a specific timestamp.
1299
 * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond
1300
 *                 to the timestamp which is <= the requested one, if backward
1301
 *                 is 0, then it will be >=
1302
 *              if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
1303
 * @return < 0 if no such timestamp could be found
1304
 */
1305
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
1306

    
1307
/**
1308
 * Add an index entry into a sorted list. Update the entry if the list
1309
 * already contains it.
1310
 *
1311
 * @param timestamp timestamp in the time base of the given stream
1312
 */
1313
int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp,
1314
                       int size, int distance, int flags);
1315

    
1316
/**
1317
 * Perform a binary search using av_index_search_timestamp() and
1318
 * AVInputFormat.read_timestamp().
1319
 * This is not supposed to be called directly by a user application,
1320
 * but by demuxers.
1321
 * @param target_ts target timestamp in the time base of the given stream
1322
 * @param stream_index stream number
1323
 */
1324
int av_seek_frame_binary(AVFormatContext *s, int stream_index,
1325
                         int64_t target_ts, int flags);
1326

    
1327
/**
1328
 * Update cur_dts of all streams based on the given timestamp and AVStream.
1329
 *
1330
 * Stream ref_st unchanged, others set cur_dts in their native time base.
1331
 * Only needed for timestamp wrapping or if (dts not set and pts!=dts).
1332
 * @param timestamp new dts expressed in time_base of param ref_st
1333
 * @param ref_st reference stream giving time_base of param timestamp
1334
 */
1335
void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
1336

    
1337
/**
1338
 * Perform a binary search using read_timestamp().
1339
 * This is not supposed to be called directly by a user application,
1340
 * but by demuxers.
1341
 * @param target_ts target timestamp in the time base of the given stream
1342
 * @param stream_index stream number
1343
 */
1344
int64_t av_gen_search(AVFormatContext *s, int stream_index,
1345
                      int64_t target_ts, int64_t pos_min,
1346
                      int64_t pos_max, int64_t pos_limit,
1347
                      int64_t ts_min, int64_t ts_max,
1348
                      int flags, int64_t *ts_ret,
1349
                      int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
1350

    
1351
/**
1352
 * media file output
1353
 */
1354
int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
1355

    
1356
/**
1357
 * Split a URL string into components.
1358
 *
1359
 * The pointers to buffers for storing individual components may be null,
1360
 * in order to ignore that component. Buffers for components not found are
1361
 * set to empty strings. If the port is not found, it is set to a negative
1362
 * value.
1363
 *
1364
 * @param proto the buffer for the protocol
1365
 * @param proto_size the size of the proto buffer
1366
 * @param authorization the buffer for the authorization
1367
 * @param authorization_size the size of the authorization buffer
1368
 * @param hostname the buffer for the host name
1369
 * @param hostname_size the size of the hostname buffer
1370
 * @param port_ptr a pointer to store the port number in
1371
 * @param path the buffer for the path
1372
 * @param path_size the size of the path buffer
1373
 * @param url the URL to split
1374
 */
1375
void av_url_split(char *proto,         int proto_size,
1376
                  char *authorization, int authorization_size,
1377
                  char *hostname,      int hostname_size,
1378
                  int *port_ptr,
1379
                  char *path,          int path_size,
1380
                  const char *url);
1381

    
1382
/**
1383
 * Allocate the stream private data and write the stream header to an
1384
 * output media file.
1385
 * @note: this sets stream time-bases, if possible to stream->codec->time_base
1386
 * but for some formats it might also be some other time base
1387
 *
1388
 * @param s media file handle
1389
 * @return 0 if OK, AVERROR_xxx on error
1390
 */
1391
int av_write_header(AVFormatContext *s);
1392

    
1393
/**
1394
 * Write a packet to an output media file.
1395
 *
1396
 * The packet shall contain one audio or video frame.
1397
 * The packet must be correctly interleaved according to the container
1398
 * specification, if not then av_interleaved_write_frame must be used.
1399
 *
1400
 * @param s media file handle
1401
 * @param pkt The packet, which contains the stream_index, buf/buf_size,
1402
              dts/pts, ...
1403
 * @return < 0 on error, = 0 if OK, 1 if end of stream wanted
1404
 */
1405
int av_write_frame(AVFormatContext *s, AVPacket *pkt);
1406

    
1407
/**
1408
 * Write a packet to an output media file ensuring correct interleaving.
1409
 *
1410
 * The packet must contain one audio or video frame.
1411
 * If the packets are already correctly interleaved, the application should
1412
 * call av_write_frame() instead as it is slightly faster. It is also important
1413
 * to keep in mind that completely non-interleaved input will need huge amounts
1414
 * of memory to interleave with this, so it is preferable to interleave at the
1415
 * demuxer level.
1416
 *
1417
 * @param s media file handle
1418
 * @param pkt The packet, which contains the stream_index, buf/buf_size,
1419
              dts/pts, ...
1420
 * @return < 0 on error, = 0 if OK, 1 if end of stream wanted
1421
 */
1422
int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
1423

    
1424
/**
1425
 * Interleave a packet per dts in an output media file.
1426
 *
1427
 * Packets with pkt->destruct == av_destruct_packet will be freed inside this
1428
 * function, so they cannot be used after it. Note that calling av_free_packet()
1429
 * on them is still safe.
1430
 *
1431
 * @param s media file handle
1432
 * @param out the interleaved packet will be output here
1433
 * @param pkt the input packet
1434
 * @param flush 1 if no further packets are available as input and all
1435
 *              remaining packets should be output
1436
 * @return 1 if a packet was output, 0 if no packet could be output,
1437
 *         < 0 if an error occurred
1438
 */
1439
int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
1440
                                 AVPacket *pkt, int flush);
1441

    
1442
/**
1443
 * Write the stream trailer to an output media file and free the
1444
 * file private data.
1445
 *
1446
 * May only be called after a successful call to av_write_header.
1447
 *
1448
 * @param s media file handle
1449
 * @return 0 if OK, AVERROR_xxx on error
1450
 */
1451
int av_write_trailer(AVFormatContext *s);
1452

    
1453
#if FF_API_DUMP_FORMAT
1454
attribute_deprecated void dump_format(AVFormatContext *ic,
1455
                                      int index,
1456
                                      const char *url,
1457
                                      int is_output);
1458
#endif
1459

    
1460
void av_dump_format(AVFormatContext *ic,
1461
                    int index,
1462
                    const char *url,
1463
                    int is_output);
1464

    
1465
#if FF_API_PARSE_FRAME_PARAM
1466
/**
1467
 * Parse width and height out of string str.
1468
 * @deprecated Use av_parse_video_frame_size instead.
1469
 */
1470
attribute_deprecated int parse_image_size(int *width_ptr, int *height_ptr,
1471
                                          const char *str);
1472

    
1473
/**
1474
 * Convert framerate from a string to a fraction.
1475
 * @deprecated Use av_parse_video_frame_rate instead.
1476
 */
1477
attribute_deprecated int parse_frame_rate(int *frame_rate, int *frame_rate_base,
1478
                                          const char *arg);
1479
#endif
1480

    
1481
#if FF_API_PARSE_DATE
1482
/**
1483
 * Parse datestr and return a corresponding number of microseconds.
1484
 *
1485
 * @param datestr String representing a date or a duration.
1486
 * See av_parse_time() for the syntax of the provided string.
1487
 * @deprecated in favor of av_parse_time()
1488
 */
1489
attribute_deprecated
1490
int64_t parse_date(const char *datestr, int duration);
1491
#endif
1492

    
1493
/**
1494
 * Get the current time in microseconds.
1495
 */
1496
int64_t av_gettime(void);
1497

    
1498
/* ffm-specific for ffserver */
1499
#define FFM_PACKET_SIZE 4096
1500
int64_t ffm_read_write_index(int fd);
1501
int ffm_write_write_index(int fd, int64_t pos);
1502
void ffm_set_write_index(AVFormatContext *s, int64_t pos, int64_t file_size);
1503

    
1504
#if FF_API_FIND_INFO_TAG
1505
/**
1506
 * @deprecated use av_find_info_tag in libavutil instead.
1507
 */
1508
attribute_deprecated int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
1509
#endif
1510

    
1511
/**
1512
 * Return in 'buf' the path with '%d' replaced by a number.
1513
 *
1514
 * Also handles the '%0nd' format where 'n' is the total number
1515
 * of digits and '%%'.
1516
 *
1517
 * @param buf destination buffer
1518
 * @param buf_size destination buffer size
1519
 * @param path numbered sequence string
1520
 * @param number frame number
1521
 * @return 0 if OK, -1 on format error
1522
 */
1523
int av_get_frame_filename(char *buf, int buf_size,
1524
                          const char *path, int number);
1525

    
1526
/**
1527
 * Check whether filename actually is a numbered sequence generator.
1528
 *
1529
 * @param filename possible numbered sequence string
1530
 * @return 1 if a valid numbered sequence string, 0 otherwise
1531
 */
1532
int av_filename_number_test(const char *filename);
1533

    
1534
/**
1535
 * Generate an SDP for an RTP session.
1536
 *
1537
 * @param ac array of AVFormatContexts describing the RTP streams. If the
1538
 *           array is composed by only one context, such context can contain
1539
 *           multiple AVStreams (one AVStream per RTP stream). Otherwise,
1540
 *           all the contexts in the array (an AVCodecContext per RTP stream)
1541
 *           must contain only one AVStream.
1542
 * @param n_files number of AVCodecContexts contained in ac
1543
 * @param buff buffer where the SDP will be stored (must be allocated by
1544
 *             the caller)
1545
 * @param size the size of the buffer
1546
 * @return 0 if OK, AVERROR_xxx on error
1547
 */
1548
int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size);
1549

    
1550
/**
1551
 * Return a positive value if the given filename has one of the given
1552
 * extensions, 0 otherwise.
1553
 *
1554
 * @param extensions a comma-separated list of filename extensions
1555
 */
1556
int av_match_ext(const char *filename, const char *extensions);
1557

    
1558
#endif /* AVFORMAT_AVFORMAT_H */