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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(ByteIOContext *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(ByteIOContext *s, AVPacket *pkt, int size);
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/*************************************************/
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/* fractional numbers for exact pts handling */
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/**
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 * The exact value of the fractional number is: 'val + num / den'.
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 * num is assumed to be 0 <= num < den.
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 */
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typedef struct AVFrac {
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    int64_t val, num, den;
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} AVFrac;
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/*************************************************/
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/* input/output formats */
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struct AVCodecTag;
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/**
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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 url_fopen, no opened file should be provided by the caller.
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#define AVFMT_NOFILE        0x0001
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#define AVFMT_NEEDNUMBER    0x0002 /**< Needs '%d' in filename. */
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#define AVFMT_SHOW_IDS      0x0008 /**< Show format stream IDs numbers. */
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#define AVFMT_RAWPICTURE    0x0020 /**< Format wants AVPicture structure for
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                                      raw picture data. */
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#define AVFMT_GLOBALHEADER  0x0040 /**< Format wants global header. */
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#define AVFMT_NOTIMESTAMPS  0x0080 /**< Format does not need / have any timestamps. */
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#define AVFMT_GENERIC_INDEX 0x0100 /**< Use generic index building code. */
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#define AVFMT_TS_DISCONT    0x0200 /**< Format allows timestamp discontinuities. 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. */
460
} 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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/**
470
 * Track should be used during playback by default.
471
 * Useful for subtitle track that should be displayed
472
 * even when user did not explicitly ask for subtitles.
473
 */
474
#define AV_DISPOSITION_FORCED    0x0040
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/**
477
 * Stream structure.
478
 * New fields can be added to the end with minor version bumps.
479
 * Removal, reordering and changes to existing fields require a major
480
 * version bump.
481
 * sizeof(AVStream) must not be used outside libav*.
482
 */
483
typedef struct AVStream {
484
    int index;    /**< stream index in AVFormatContext */
485
    int id;       /**< format-specific stream ID */
486
    AVCodecContext *codec; /**< codec context */
487
    /**
488
     * Real base framerate of the stream.
489
     * This is the lowest framerate with which all timestamps can be
490
     * represented accurately (it is the least common multiple of all
491
     * framerates in the stream). Note, this value is just a guess!
492
     * 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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     */
495
    AVRational r_frame_rate;
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    void *priv_data;
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498
    /* internal data used in av_find_stream_info() */
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    int64_t first_dts;
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501
    /**
502
     * encoding: pts generation when outputting stream
503
     */
504
    struct AVFrac pts;
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506
    /**
507
     * This is the fundamental unit of time (in seconds) in terms
508
     * of which frame timestamps are represented. For fixed-fps content,
509
     * 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
512
     */
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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?
520
    /**
521
     * Quality, as it has been removed from AVCodecContext and put in AVVideoFrame.
522
     * MN: dunno if that is the right place for it
523
     */
524
    float quality;
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526
    /**
527
     * Decoding: pts of the first frame of the stream, in stream time base.
528
     * 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.
530
     * This may be undefined (AV_NOPTS_VALUE).
531
     * @note The ASF header does NOT contain a correct start_time the ASF
532
     * demuxer must NOT set this.
533
     */
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    int64_t start_time;
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536
    /**
537
     * Decoding: duration of the stream, in stream time base.
538
     * 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.
540
     */
541
    int64_t duration;
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#if FF_API_OLD_METADATA
544
    attribute_deprecated char language[4]; /**< ISO 639-2/B 3-letter language code (empty string if undefined) */
545
#endif
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547
    /* av_read_frame() support */
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    enum AVStreamParseType need_parsing;
549
    struct AVCodecParserContext *parser;
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551
    int64_t cur_dts;
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    int last_IP_duration;
553
    int64_t last_IP_pts;
554
    /* av_seek_frame() support */
555
    AVIndexEntry *index_entries; /**< Only used if the format does not
556
                                    support seeking natively. */
557
    int nb_index_entries;
558
    unsigned int index_entries_allocated_size;
559

    
560
    int64_t nb_frames;                 ///< number of frames in this stream if known or 0
561

    
562
#if FF_API_LAVF_UNUSED
563
    attribute_deprecated int64_t unused[4+1];
564
#endif
565

    
566
#if FF_API_OLD_METADATA
567
    attribute_deprecated char *filename; /**< source filename of the stream */
568
#endif
569

    
570
    int disposition; /**< AV_DISPOSITION_* bit field */
571

    
572
    AVProbeData probe_data;
573
#define MAX_REORDER_DELAY 16
574
    int64_t pts_buffer[MAX_REORDER_DELAY+1];
575

    
576
    /**
577
     * sample aspect ratio (0 if unknown)
578
     * - encoding: Set by user.
579
     * - decoding: Set by libavformat.
580
     */
581
    AVRational sample_aspect_ratio;
582

    
583
    AVMetadata *metadata;
584

    
585
    /* Intended mostly for av_read_frame() support. Not supposed to be used by */
586
    /* external applications; try to use something else if at all possible.    */
587
    const uint8_t *cur_ptr;
588
    int cur_len;
589
    AVPacket cur_pkt;
590

    
591
    // Timestamp generation support:
592
    /**
593
     * Timestamp corresponding to the last dts sync point.
594
     *
595
     * Initialized when AVCodecParserContext.dts_sync_point >= 0 and
596
     * a DTS is received from the underlying container. Otherwise set to
597
     * AV_NOPTS_VALUE by default.
598
     */
599
    int64_t reference_dts;
600

    
601
    /**
602
     * Number of packets to buffer for codec probing
603
     * NOT PART OF PUBLIC API
604
     */
605
#define MAX_PROBE_PACKETS 2500
606
    int probe_packets;
607

    
608
    /**
609
     * last packet in packet_buffer for this stream when muxing.
610
     * used internally, NOT PART OF PUBLIC API, dont read or write from outside of libav*
611
     */
612
    struct AVPacketList *last_in_packet_buffer;
613

    
614
    /**
615
     * Average framerate
616
     */
617
    AVRational avg_frame_rate;
618

    
619
    /**
620
     * Number of frames that have been demuxed during av_find_stream_info()
621
     */
622
    int codec_info_nb_frames;
623

    
624
    /**
625
     * Stream informations used internally by av_find_stream_info()
626
     */
627
#define MAX_STD_TIMEBASES (60*12+5)
628
    struct {
629
        int64_t last_dts;
630
        int64_t duration_gcd;
631
        int duration_count;
632
        double duration_error[MAX_STD_TIMEBASES];
633
        int64_t codec_info_duration;
634
    } *info;
635
} AVStream;
636

    
637
#define AV_PROGRAM_RUNNING 1
638

    
639
/**
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(AVProgram) must not be used outside libav*.
644
 */
645
typedef struct AVProgram {
646
    int            id;
647
#if FF_API_OLD_METADATA
648
    attribute_deprecated char           *provider_name; ///< network name for DVB streams
649
    attribute_deprecated char           *name;          ///< service name for DVB streams
650
#endif
651
    int            flags;
652
    enum AVDiscard discard;        ///< selects which program to discard and which to feed to the caller
653
    unsigned int   *stream_index;
654
    unsigned int   nb_stream_indexes;
655
    AVMetadata *metadata;
656
} AVProgram;
657

    
658
#define AVFMTCTX_NOHEADER      0x0001 /**< signal that no header is present
659
                                         (streams are added dynamically) */
660

    
661
typedef struct AVChapter {
662
    int id;                 ///< unique ID to identify the chapter
663
    AVRational time_base;   ///< time base in which the start/end timestamps are specified
664
    int64_t start, end;     ///< chapter start/end time in time_base units
665
#if FF_API_OLD_METADATA
666
    attribute_deprecated char *title;            ///< chapter title
667
#endif
668
    AVMetadata *metadata;
669
} AVChapter;
670

    
671
#if FF_API_MAX_STREAMS
672
#define MAX_STREAMS 20
673
#endif
674

    
675
/**
676
 * Format I/O context.
677
 * New fields can be added to the end with minor version bumps.
678
 * Removal, reordering and changes to existing fields require a major
679
 * version bump.
680
 * sizeof(AVFormatContext) must not be used outside libav*.
681
 */
682
typedef struct AVFormatContext {
683
    const AVClass *av_class; /**< Set by avformat_alloc_context. */
684
    /* Can only be iformat or oformat, not both at the same time. */
685
    struct AVInputFormat *iformat;
686
    struct AVOutputFormat *oformat;
687
    void *priv_data;
688
    ByteIOContext *pb;
689
    unsigned int nb_streams;
690
#if FF_API_MAX_STREAMS
691
    AVStream *streams[MAX_STREAMS];
692
#else
693
    AVStream **streams;
694
#endif
695
    char filename[1024]; /**< input or output filename */
696
    /* stream info */
697
    int64_t timestamp;
698
#if FF_API_OLD_METADATA
699
    attribute_deprecated char title[512];
700
    attribute_deprecated char author[512];
701
    attribute_deprecated char copyright[512];
702
    attribute_deprecated char comment[512];
703
    attribute_deprecated char album[512];
704
    attribute_deprecated int year;  /**< ID3 year, 0 if none */
705
    attribute_deprecated int track; /**< track number, 0 if none */
706
    attribute_deprecated char genre[32]; /**< ID3 genre */
707
#endif
708

    
709
    int ctx_flags; /**< Format-specific flags, see AVFMTCTX_xx */
710
    /* private data for pts handling (do not modify directly). */
711
    /**
712
     * This buffer is only needed when packets were already buffered but
713
     * not decoded, for example to get the codec parameters in MPEG
714
     * streams.
715
     */
716
    struct AVPacketList *packet_buffer;
717

    
718
    /**
719
     * Decoding: position of the first frame of the component, in
720
     * AV_TIME_BASE fractional seconds. NEVER set this value directly:
721
     * It is deduced from the AVStream values.
722
     */
723
    int64_t start_time;
724

    
725
    /**
726
     * Decoding: duration of the stream, in AV_TIME_BASE fractional
727
     * seconds. Only set this value if you know none of the individual stream
728
     * durations and also dont set any of them. This is deduced from the
729
     * AVStream values if not set.
730
     */
731
    int64_t duration;
732

    
733
    /**
734
     * decoding: total file size, 0 if unknown
735
     */
736
    int64_t file_size;
737

    
738
    /**
739
     * Decoding: total stream bitrate in bit/s, 0 if not
740
     * available. Never set it directly if the file_size and the
741
     * duration are known as FFmpeg can compute it automatically.
742
     */
743
    int bit_rate;
744

    
745
    /* av_read_frame() support */
746
    AVStream *cur_st;
747
#if FF_API_LAVF_UNUSED
748
    const uint8_t *cur_ptr_deprecated;
749
    int cur_len_deprecated;
750
    AVPacket cur_pkt_deprecated;
751
#endif
752

    
753
    /* av_seek_frame() support */
754
    int64_t data_offset; /**< offset of the first packet */
755
    int index_built;
756

    
757
    int mux_rate;
758
    unsigned int packet_size;
759
    int preload;
760
    int max_delay;
761

    
762
#define AVFMT_NOOUTPUTLOOP -1
763
#define AVFMT_INFINITEOUTPUTLOOP 0
764
    /**
765
     * number of times to loop output in formats that support it
766
     */
767
    int loop_output;
768

    
769
    int flags;
770
#define AVFMT_FLAG_GENPTS       0x0001 ///< Generate missing pts even if it requires parsing future frames.
771
#define AVFMT_FLAG_IGNIDX       0x0002 ///< Ignore index.
772
#define AVFMT_FLAG_NONBLOCK     0x0004 ///< Do not block when reading packets from input.
773
#define AVFMT_FLAG_IGNDTS       0x0008 ///< Ignore DTS on frames that contain both DTS & PTS
774
#define AVFMT_FLAG_NOFILLIN     0x0010 ///< Do not infer any values from other values, just return what is stored in the container
775
#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
776
#define AVFMT_FLAG_RTP_HINT     0x0040 ///< Add RTP hinting to the output file
777

    
778
    int loop_input;
779

    
780
    /**
781
     * decoding: size of data to probe; encoding: unused.
782
     */
783
    unsigned int probesize;
784

    
785
    /**
786
     * Maximum time (in AV_TIME_BASE units) during which the input should
787
     * be analyzed in av_find_stream_info().
788
     */
789
    int max_analyze_duration;
790

    
791
    const uint8_t *key;
792
    int keylen;
793

    
794
    unsigned int nb_programs;
795
    AVProgram **programs;
796

    
797
    /**
798
     * Forced video codec_id.
799
     * Demuxing: Set by user.
800
     */
801
    enum CodecID video_codec_id;
802

    
803
    /**
804
     * Forced audio codec_id.
805
     * Demuxing: Set by user.
806
     */
807
    enum CodecID audio_codec_id;
808

    
809
    /**
810
     * Forced subtitle codec_id.
811
     * Demuxing: Set by user.
812
     */
813
    enum CodecID subtitle_codec_id;
814

    
815
    /**
816
     * Maximum amount of memory in bytes to use for the index of each stream.
817
     * If the index exceeds this size, entries will be discarded as
818
     * needed to maintain a smaller size. This can lead to slower or less
819
     * accurate seeking (depends on demuxer).
820
     * Demuxers for which a full in-memory index is mandatory will ignore
821
     * this.
822
     * muxing  : unused
823
     * demuxing: set by user
824
     */
825
    unsigned int max_index_size;
826

    
827
    /**
828
     * Maximum amount of memory in bytes to use for buffering frames
829
     * obtained from realtime capture devices.
830
     */
831
    unsigned int max_picture_buffer;
832

    
833
    unsigned int nb_chapters;
834
    AVChapter **chapters;
835

    
836
    /**
837
     * Flags to enable debugging.
838
     */
839
    int debug;
840
#define FF_FDEBUG_TS        0x0001
841

    
842
    /**
843
     * Raw packets from the demuxer, prior to parsing and decoding.
844
     * This buffer is used for buffering packets until the codec can
845
     * be identified, as parsing cannot be done without knowing the
846
     * codec.
847
     */
848
    struct AVPacketList *raw_packet_buffer;
849
    struct AVPacketList *raw_packet_buffer_end;
850

    
851
    struct AVPacketList *packet_buffer_end;
852

    
853
    AVMetadata *metadata;
854

    
855
    /**
856
     * Remaining size available for raw_packet_buffer, in bytes.
857
     * NOT PART OF PUBLIC API
858
     */
859
#define RAW_PACKET_BUFFER_SIZE 2500000
860
    int raw_packet_buffer_remaining_size;
861

    
862
    /**
863
     * Start time of the stream in real world time, in microseconds
864
     * since the unix epoch (00:00 1st January 1970). That is, pts=0
865
     * in the stream was captured at this real world time.
866
     * - encoding: Set by user.
867
     * - decoding: Unused.
868
     */
869
    int64_t start_time_realtime;
870
} AVFormatContext;
871

    
872
typedef struct AVPacketList {
873
    AVPacket pkt;
874
    struct AVPacketList *next;
875
} AVPacketList;
876

    
877
#if FF_API_FIRST_FORMAT
878
attribute_deprecated extern AVInputFormat *first_iformat;
879
attribute_deprecated extern AVOutputFormat *first_oformat;
880
#endif
881

    
882
/**
883
 * If f is NULL, returns the first registered input format,
884
 * if f is non-NULL, returns the next registered input format after f
885
 * or NULL if f is the last one.
886
 */
887
AVInputFormat  *av_iformat_next(AVInputFormat  *f);
888

    
889
/**
890
 * If f is NULL, returns the first registered output format,
891
 * if f is non-NULL, returns the next registered output format after f
892
 * or NULL if f is the last one.
893
 */
894
AVOutputFormat *av_oformat_next(AVOutputFormat *f);
895

    
896
enum CodecID av_guess_image2_codec(const char *filename);
897

    
898
/* XXX: Use automatic init with either ELF sections or C file parser */
899
/* modules. */
900

    
901
/* utils.c */
902
void av_register_input_format(AVInputFormat *format);
903
void av_register_output_format(AVOutputFormat *format);
904
#if FF_API_GUESS_FORMAT
905
attribute_deprecated AVOutputFormat *guess_stream_format(const char *short_name,
906
                                    const char *filename,
907
                                    const char *mime_type);
908

    
909
/**
910
 * @deprecated Use av_guess_format() instead.
911
 */
912
attribute_deprecated AVOutputFormat *guess_format(const char *short_name,
913
                                                  const char *filename,
914
                                                  const char *mime_type);
915
#endif
916

    
917
/**
918
 * Return the output format in the list of registered output formats
919
 * which best matches the provided parameters, or return NULL if
920
 * there is no match.
921
 *
922
 * @param short_name if non-NULL checks if short_name matches with the
923
 * names of the registered formats
924
 * @param filename if non-NULL checks if filename terminates with the
925
 * extensions of the registered formats
926
 * @param mime_type if non-NULL checks if mime_type matches with the
927
 * MIME type of the registered formats
928
 */
929
AVOutputFormat *av_guess_format(const char *short_name,
930
                                const char *filename,
931
                                const char *mime_type);
932

    
933
/**
934
 * Guess the codec ID based upon muxer and filename.
935
 */
936
enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
937
                            const char *filename, const char *mime_type,
938
                            enum AVMediaType type);
939

    
940
/**
941
 * Send a nice hexadecimal dump of a buffer to the specified file stream.
942
 *
943
 * @param f The file stream pointer where the dump should be sent to.
944
 * @param buf buffer
945
 * @param size buffer size
946
 *
947
 * @see av_hex_dump_log, av_pkt_dump, av_pkt_dump_log
948
 */
949
void av_hex_dump(FILE *f, uint8_t *buf, int size);
950

    
951
/**
952
 * Send a nice hexadecimal dump of a buffer to the log.
953
 *
954
 * @param avcl A pointer to an arbitrary struct of which the first field is a
955
 * pointer to an AVClass struct.
956
 * @param level The importance level of the message, lower values signifying
957
 * higher importance.
958
 * @param buf buffer
959
 * @param size buffer size
960
 *
961
 * @see av_hex_dump, av_pkt_dump, av_pkt_dump_log
962
 */
963
void av_hex_dump_log(void *avcl, int level, uint8_t *buf, int size);
964

    
965
/**
966
 * Send a nice dump of a packet to the specified file stream.
967
 *
968
 * @param f The file stream pointer where the dump should be sent to.
969
 * @param pkt packet to dump
970
 * @param dump_payload True if the payload must be displayed, too.
971
 */
972
void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
973

    
974
/**
975
 * Send a nice dump of a packet to the log.
976
 *
977
 * @param avcl A pointer to an arbitrary struct of which the first field is a
978
 * pointer to an AVClass struct.
979
 * @param level The importance level of the message, lower values signifying
980
 * higher importance.
981
 * @param pkt packet to dump
982
 * @param dump_payload True if the payload must be displayed, too.
983
 */
984
void av_pkt_dump_log(void *avcl, int level, AVPacket *pkt, int dump_payload);
985

    
986
/**
987
 * Initialize libavformat and register all the muxers, demuxers and
988
 * protocols. If you do not call this function, then you can select
989
 * exactly which formats you want to support.
990
 *
991
 * @see av_register_input_format()
992
 * @see av_register_output_format()
993
 * @see av_register_protocol()
994
 */
995
void av_register_all(void);
996

    
997
/**
998
 * Get the CodecID for the given codec tag tag.
999
 * If no codec id is found returns CODEC_ID_NONE.
1000
 *
1001
 * @param tags list of supported codec_id-codec_tag pairs, as stored
1002
 * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
1003
 */
1004
enum CodecID av_codec_get_id(const struct AVCodecTag * const *tags, unsigned int tag);
1005

    
1006
/**
1007
 * Get the codec tag for the given codec id id.
1008
 * If no codec tag is found returns 0.
1009
 *
1010
 * @param tags list of supported codec_id-codec_tag pairs, as stored
1011
 * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
1012
 */
1013
unsigned int av_codec_get_tag(const struct AVCodecTag * const *tags, enum CodecID id);
1014

    
1015
/* media file input */
1016

    
1017
/**
1018
 * Find AVInputFormat based on the short name of the input format.
1019
 */
1020
AVInputFormat *av_find_input_format(const char *short_name);
1021

    
1022
/**
1023
 * Guess the file format.
1024
 *
1025
 * @param is_opened Whether the file is already opened; determines whether
1026
 *                  demuxers with or without AVFMT_NOFILE are probed.
1027
 */
1028
AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
1029

    
1030
/**
1031
 * Guess the file format.
1032
 *
1033
 * @param is_opened Whether the file is already opened; determines whether
1034
 *                  demuxers with or without AVFMT_NOFILE are probed.
1035
 * @param score_max A probe score larger that this is required to accept a
1036
 *                  detection, the variable is set to the actual detection
1037
 *                  score afterwards.
1038
 *                  If the score is <= AVPROBE_SCORE_MAX / 4 it is recommended
1039
 *                  to retry with a larger probe buffer.
1040
 */
1041
AVInputFormat *av_probe_input_format2(AVProbeData *pd, int is_opened, int *score_max);
1042

    
1043
/**
1044
 * Allocate all the structures needed to read an input stream.
1045
 *        This does not open the needed codecs for decoding the stream[s].
1046
 */
1047
int av_open_input_stream(AVFormatContext **ic_ptr,
1048
                         ByteIOContext *pb, const char *filename,
1049
                         AVInputFormat *fmt, AVFormatParameters *ap);
1050

    
1051
/**
1052
 * Open a media file as input. The codecs are not opened. Only the file
1053
 * header (if present) is read.
1054
 *
1055
 * @param ic_ptr The opened media file handle is put here.
1056
 * @param filename filename to open
1057
 * @param fmt If non-NULL, force the file format to use.
1058
 * @param buf_size optional buffer size (zero if default is OK)
1059
 * @param ap Additional parameters needed when opening the file
1060
 *           (NULL if default).
1061
 * @return 0 if OK, AVERROR_xxx otherwise
1062
 */
1063
int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
1064
                       AVInputFormat *fmt,
1065
                       int buf_size,
1066
                       AVFormatParameters *ap);
1067

    
1068
#if FF_API_ALLOC_FORMAT_CONTEXT
1069
/**
1070
 * @deprecated Use avformat_alloc_context() instead.
1071
 */
1072
attribute_deprecated AVFormatContext *av_alloc_format_context(void);
1073
#endif
1074

    
1075
/**
1076
 * Allocate an AVFormatContext.
1077
 * avformat_free_context() can be used to free the context and everything
1078
 * allocated by the framework within it.
1079
 */
1080
AVFormatContext *avformat_alloc_context(void);
1081

    
1082
/**
1083
 * Read packets of a media file to get stream information. This
1084
 * is useful for file formats with no headers such as MPEG. This
1085
 * function also computes the real framerate in case of MPEG-2 repeat
1086
 * frame mode.
1087
 * The logical file position is not changed by this function;
1088
 * examined packets may be buffered for later processing.
1089
 *
1090
 * @param ic media file handle
1091
 * @return >=0 if OK, AVERROR_xxx on error
1092
 * @todo Let the user decide somehow what information is needed so that
1093
 *       we do not waste time getting stuff the user does not need.
1094
 */
1095
int av_find_stream_info(AVFormatContext *ic);
1096

    
1097
/**
1098
 * Find the "best" stream in the file.
1099
 * The best stream is determined according to various heuristics as the most
1100
 * likely to be what the user expects.
1101
 * If the decoder parameter is non-NULL, av_find_best_stream will find the
1102
 * default decoder for the stream's codec; streams for which no decoder can
1103
 * be found are ignored.
1104
 *
1105
 * @param ic                media file handle
1106
 * @param type              stream type: video, audio, subtitles, etc.
1107
 * @param wanted_stream_nb  user-requested stream number,
1108
 *                          or -1 for automatic selection
1109
 * @param related_stream    try to find a stream related (eg. in the same
1110
 *                          program) to this one, or -1 if none
1111
 * @param decoder_ret       if non-NULL, returns the decoder for the
1112
 *                          selected stream
1113
 * @param flags             flags; none are currently defined
1114
 * @return  the non-negative stream number in case of success,
1115
 *          AVERROR_STREAM_NOT_FOUND if no stream with the requested type
1116
 *          could be found,
1117
 *          AVERROR_DECODER_NOT_FOUND if streams were found but no decoder
1118
 * @note  If av_find_best_stream returns successfully and decoder_ret is not
1119
 *        NULL, then *decoder_ret is guaranteed to be set to a valid AVCodec.
1120
 */
1121
int av_find_best_stream(AVFormatContext *ic,
1122
                        enum AVMediaType type,
1123
                        int wanted_stream_nb,
1124
                        int related_stream,
1125
                        AVCodec **decoder_ret,
1126
                        int flags);
1127

    
1128
/**
1129
 * Read a transport packet from a media file.
1130
 *
1131
 * This function is obsolete and should never be used.
1132
 * Use av_read_frame() instead.
1133
 *
1134
 * @param s media file handle
1135
 * @param pkt is filled
1136
 * @return 0 if OK, AVERROR_xxx on error
1137
 */
1138
int av_read_packet(AVFormatContext *s, AVPacket *pkt);
1139

    
1140
/**
1141
 * Return the next frame of a stream.
1142
 * This function returns what is stored in the file, and does not validate
1143
 * that what is there are valid frames for the decoder. It will split what is
1144
 * stored in the file into frames and return one for each call. It will not
1145
 * omit invalid data between valid frames so as to give the decoder the maximum
1146
 * information possible for decoding.
1147
 *
1148
 * The returned packet is valid
1149
 * until the next av_read_frame() or until av_close_input_file() and
1150
 * must be freed with av_free_packet. For video, the packet contains
1151
 * exactly one frame. For audio, it contains an integer number of
1152
 * frames if each frame has a known fixed size (e.g. PCM or ADPCM
1153
 * data). If the audio frames have a variable size (e.g. MPEG audio),
1154
 * then it contains one frame.
1155
 *
1156
 * pkt->pts, pkt->dts and pkt->duration are always set to correct
1157
 * values in AVStream.time_base units (and guessed if the format cannot
1158
 * provide them). pkt->pts can be AV_NOPTS_VALUE if the video format
1159
 * has B-frames, so it is better to rely on pkt->dts if you do not
1160
 * decompress the payload.
1161
 *
1162
 * @return 0 if OK, < 0 on error or end of file
1163
 */
1164
int av_read_frame(AVFormatContext *s, AVPacket *pkt);
1165

    
1166
/**
1167
 * Seek to the keyframe at timestamp.
1168
 * 'timestamp' in 'stream_index'.
1169
 * @param stream_index If stream_index is (-1), a default
1170
 * stream is selected, and timestamp is automatically converted
1171
 * from AV_TIME_BASE units to the stream specific time_base.
1172
 * @param timestamp Timestamp in AVStream.time_base units
1173
 *        or, if no stream is specified, in AV_TIME_BASE units.
1174
 * @param flags flags which select direction and seeking mode
1175
 * @return >= 0 on success
1176
 */
1177
int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp,
1178
                  int flags);
1179

    
1180
/**
1181
 * Seek to timestamp ts.
1182
 * Seeking will be done so that the point from which all active streams
1183
 * can be presented successfully will be closest to ts and within min/max_ts.
1184
 * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
1185
 *
1186
 * If flags contain AVSEEK_FLAG_BYTE, then all timestamps are in bytes and
1187
 * are the file position (this may not be supported by all demuxers).
1188
 * If flags contain AVSEEK_FLAG_FRAME, then all timestamps are in frames
1189
 * in the stream with stream_index (this may not be supported by all demuxers).
1190
 * Otherwise all timestamps are in units of the stream selected by stream_index
1191
 * or if stream_index is -1, in AV_TIME_BASE units.
1192
 * If flags contain AVSEEK_FLAG_ANY, then non-keyframes are treated as
1193
 * keyframes (this may not be supported by all demuxers).
1194
 *
1195
 * @param stream_index index of the stream which is used as time base reference
1196
 * @param min_ts smallest acceptable timestamp
1197
 * @param ts target timestamp
1198
 * @param max_ts largest acceptable timestamp
1199
 * @param flags flags
1200
 * @return >=0 on success, error code otherwise
1201
 *
1202
 * @note This is part of the new seek API which is still under construction.
1203
 *       Thus do not use this yet. It may change at any time, do not expect
1204
 *       ABI compatibility yet!
1205
 */
1206
int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
1207

    
1208
/**
1209
 * Start playing a network-based stream (e.g. RTSP stream) at the
1210
 * current position.
1211
 */
1212
int av_read_play(AVFormatContext *s);
1213

    
1214
/**
1215
 * Pause a network-based stream (e.g. RTSP stream).
1216
 *
1217
 * Use av_read_play() to resume it.
1218
 */
1219
int av_read_pause(AVFormatContext *s);
1220

    
1221
/**
1222
 * Free a AVFormatContext allocated by av_open_input_stream.
1223
 * @param s context to free
1224
 */
1225
void av_close_input_stream(AVFormatContext *s);
1226

    
1227
/**
1228
 * Close a media file (but not its codecs).
1229
 *
1230
 * @param s media file handle
1231
 */
1232
void av_close_input_file(AVFormatContext *s);
1233

    
1234
/**
1235
 * Free an AVFormatContext and all its streams.
1236
 * @param s context to free
1237
 */
1238
void avformat_free_context(AVFormatContext *s);
1239

    
1240
/**
1241
 * Add a new stream to a media file.
1242
 *
1243
 * Can only be called in the read_header() function. If the flag
1244
 * AVFMTCTX_NOHEADER is in the format context, then new streams
1245
 * can be added in read_packet too.
1246
 *
1247
 * @param s media file handle
1248
 * @param id file-format-dependent stream ID
1249
 */
1250
AVStream *av_new_stream(AVFormatContext *s, int id);
1251
AVProgram *av_new_program(AVFormatContext *s, int id);
1252

    
1253
/**
1254
 * Add a new chapter.
1255
 * This function is NOT part of the public API
1256
 * and should ONLY be used by demuxers.
1257
 *
1258
 * @param s media file handle
1259
 * @param id unique ID for this chapter
1260
 * @param start chapter start time in time_base units
1261
 * @param end chapter end time in time_base units
1262
 * @param title chapter title
1263
 *
1264
 * @return AVChapter or NULL on error
1265
 */
1266
AVChapter *ff_new_chapter(AVFormatContext *s, int id, AVRational time_base,
1267
                          int64_t start, int64_t end, const char *title);
1268

    
1269
/**
1270
 * Set the pts for a given stream. If the new values would be invalid
1271
 * (<= 0), it leaves the AVStream unchanged.
1272
 *
1273
 * @param s stream
1274
 * @param pts_wrap_bits number of bits effectively used by the pts
1275
 *        (used for wrap control, 33 is the value for MPEG)
1276
 * @param pts_num numerator to convert to seconds (MPEG: 1)
1277
 * @param pts_den denominator to convert to seconds (MPEG: 90000)
1278
 */
1279
void av_set_pts_info(AVStream *s, int pts_wrap_bits,
1280
                     unsigned int pts_num, unsigned int pts_den);
1281

    
1282
#define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
1283
#define AVSEEK_FLAG_BYTE     2 ///< seeking based on position in bytes
1284
#define AVSEEK_FLAG_ANY      4 ///< seek to any frame, even non-keyframes
1285
#define AVSEEK_FLAG_FRAME    8 ///< seeking based on frame number
1286

    
1287
int av_find_default_stream_index(AVFormatContext *s);
1288

    
1289
/**
1290
 * Get the index for a specific timestamp.
1291
 * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond
1292
 *                 to the timestamp which is <= the requested one, if backward
1293
 *                 is 0, then it will be >=
1294
 *              if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
1295
 * @return < 0 if no such timestamp could be found
1296
 */
1297
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
1298

    
1299
/**
1300
 * Ensure the index uses less memory than the maximum specified in
1301
 * AVFormatContext.max_index_size by discarding entries if it grows
1302
 * too large.
1303
 * This function is not part of the public API and should only be called
1304
 * by demuxers.
1305
 */
1306
void ff_reduce_index(AVFormatContext *s, int stream_index);
1307

    
1308
/**
1309
 * Add an index entry into a sorted list. Update the entry if the list
1310
 * already contains it.
1311
 *
1312
 * @param timestamp timestamp in the time base of the given stream
1313
 */
1314
int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp,
1315
                       int size, int distance, int flags);
1316

    
1317
/**
1318
 * Perform a binary search using av_index_search_timestamp() and
1319
 * AVInputFormat.read_timestamp().
1320
 * This is not supposed to be called directly by a user application,
1321
 * but by demuxers.
1322
 * @param target_ts target timestamp in the time base of the given stream
1323
 * @param stream_index stream number
1324
 */
1325
int av_seek_frame_binary(AVFormatContext *s, int stream_index,
1326
                         int64_t target_ts, int flags);
1327

    
1328
/**
1329
 * Update cur_dts of all streams based on the given timestamp and AVStream.
1330
 *
1331
 * Stream ref_st unchanged, others set cur_dts in their native time base.
1332
 * Only needed for timestamp wrapping or if (dts not set and pts!=dts).
1333
 * @param timestamp new dts expressed in time_base of param ref_st
1334
 * @param ref_st reference stream giving time_base of param timestamp
1335
 */
1336
void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
1337

    
1338
/**
1339
 * Perform a binary search using read_timestamp().
1340
 * This is not supposed to be called directly by a user application,
1341
 * but by demuxers.
1342
 * @param target_ts target timestamp in the time base of the given stream
1343
 * @param stream_index stream number
1344
 */
1345
int64_t av_gen_search(AVFormatContext *s, int stream_index,
1346
                      int64_t target_ts, int64_t pos_min,
1347
                      int64_t pos_max, int64_t pos_limit,
1348
                      int64_t ts_min, int64_t ts_max,
1349
                      int flags, int64_t *ts_ret,
1350
                      int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
1351

    
1352
/**
1353
 * media file output
1354
 */
1355
int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
1356

    
1357
/**
1358
 * Split a URL string into components.
1359
 *
1360
 * The pointers to buffers for storing individual components may be null,
1361
 * in order to ignore that component. Buffers for components not found are
1362
 * set to empty strings. If the port is not found, it is set to a negative
1363
 * value.
1364
 *
1365
 * @param proto the buffer for the protocol
1366
 * @param proto_size the size of the proto buffer
1367
 * @param authorization the buffer for the authorization
1368
 * @param authorization_size the size of the authorization buffer
1369
 * @param hostname the buffer for the host name
1370
 * @param hostname_size the size of the hostname buffer
1371
 * @param port_ptr a pointer to store the port number in
1372
 * @param path the buffer for the path
1373
 * @param path_size the size of the path buffer
1374
 * @param url the URL to split
1375
 */
1376
void av_url_split(char *proto,         int proto_size,
1377
                  char *authorization, int authorization_size,
1378
                  char *hostname,      int hostname_size,
1379
                  int *port_ptr,
1380
                  char *path,          int path_size,
1381
                  const char *url);
1382

    
1383
/**
1384
 * Allocate the stream private data and write the stream header to an
1385
 * output media file.
1386
 * Note: this sets stream time-bases, if possible to stream->codec->time_base
1387
 * but for some formats it might also be some other time base
1388
 *
1389
 * @param s media file handle
1390
 * @return 0 if OK, AVERROR_xxx on error
1391
 */
1392
int av_write_header(AVFormatContext *s);
1393

    
1394
/**
1395
 * Write a packet to an output media file.
1396
 *
1397
 * The packet shall contain one audio or video frame.
1398
 * The packet must be correctly interleaved according to the container
1399
 * specification, if not then av_interleaved_write_frame must be used.
1400
 *
1401
 * @param s media file handle
1402
 * @param pkt The packet, which contains the stream_index, buf/buf_size,
1403
              dts/pts, ...
1404
 * @return < 0 on error, = 0 if OK, 1 if end of stream wanted
1405
 */
1406
int av_write_frame(AVFormatContext *s, AVPacket *pkt);
1407

    
1408
/**
1409
 * Write a packet to an output media file ensuring correct interleaving.
1410
 *
1411
 * The packet must contain one audio or video frame.
1412
 * If the packets are already correctly interleaved, the application should
1413
 * call av_write_frame() instead as it is slightly faster. It is also important
1414
 * to keep in mind that completely non-interleaved input will need huge amounts
1415
 * of memory to interleave with this, so it is preferable to interleave at the
1416
 * demuxer level.
1417
 *
1418
 * @param s media file handle
1419
 * @param pkt The packet, which contains the stream_index, buf/buf_size,
1420
              dts/pts, ...
1421
 * @return < 0 on error, = 0 if OK, 1 if end of stream wanted
1422
 */
1423
int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
1424

    
1425
/**
1426
 * Interleave a packet per dts in an output media file.
1427
 *
1428
 * Packets with pkt->destruct == av_destruct_packet will be freed inside this
1429
 * function, so they cannot be used after it. Note that calling av_free_packet()
1430
 * on them is still safe.
1431
 *
1432
 * @param s media file handle
1433
 * @param out the interleaved packet will be output here
1434
 * @param pkt the input packet
1435
 * @param flush 1 if no further packets are available as input and all
1436
 *              remaining packets should be output
1437
 * @return 1 if a packet was output, 0 if no packet could be output,
1438
 *         < 0 if an error occurred
1439
 */
1440
int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
1441
                                 AVPacket *pkt, int flush);
1442

    
1443
/**
1444
 * Write the stream trailer to an output media file and free the
1445
 * file private data.
1446
 *
1447
 * May only be called after a successful call to av_write_header.
1448
 *
1449
 * @param s media file handle
1450
 * @return 0 if OK, AVERROR_xxx on error
1451
 */
1452
int av_write_trailer(AVFormatContext *s);
1453

    
1454
void dump_format(AVFormatContext *ic,
1455
                 int index,
1456
                 const char *url,
1457
                 int is_output);
1458

    
1459
#if FF_API_PARSE_FRAME_PARAM
1460
/**
1461
 * Parse width and height out of string str.
1462
 * @deprecated Use av_parse_video_frame_size instead.
1463
 */
1464
attribute_deprecated int parse_image_size(int *width_ptr, int *height_ptr,
1465
                                          const char *str);
1466

    
1467
/**
1468
 * Convert framerate from a string to a fraction.
1469
 * @deprecated Use av_parse_video_frame_rate instead.
1470
 */
1471
attribute_deprecated int parse_frame_rate(int *frame_rate, int *frame_rate_base,
1472
                                          const char *arg);
1473
#endif
1474

    
1475
/**
1476
 * Parse datestr and return a corresponding number of microseconds.
1477
 * @param datestr String representing a date or a duration.
1478
 * - If a date the syntax is:
1479
 * @code
1480
 *  now|{[{YYYY-MM-DD|YYYYMMDD}[T|t| ]]{{HH[:MM[:SS[.m...]]]}|{HH[MM[SS[.m...]]]}}[Z|z]}
1481
 * @endcode
1482
 * If the value is "now" it takes the current time.
1483
 * Time is local time unless Z is appended, in which case it is
1484
 * interpreted as UTC.
1485
 * If the year-month-day part is not specified it takes the current
1486
 * year-month-day.
1487
 * @return the number of microseconds since 1st of January, 1970 up to
1488
 * the time of the parsed date or INT64_MIN if datestr cannot be
1489
 * successfully parsed.
1490
 * - If a duration the syntax is:
1491
 * @code
1492
 *  [-]HH[:MM[:SS[.m...]]]
1493
 *  [-]S+[.m...]
1494
 * @endcode
1495
 * @return the number of microseconds contained in a time interval
1496
 * with the specified duration or INT64_MIN if datestr cannot be
1497
 * successfully parsed.
1498
 * @param duration Flag which tells how to interpret datestr, if
1499
 * not zero datestr is interpreted as a duration, otherwise as a
1500
 * date.
1501
 */
1502
int64_t parse_date(const char *datestr, int duration);
1503

    
1504
/**
1505
 * Get the current time in microseconds.
1506
 */
1507
int64_t av_gettime(void);
1508

    
1509
/* ffm-specific for ffserver */
1510
#define FFM_PACKET_SIZE 4096
1511
int64_t ffm_read_write_index(int fd);
1512
int ffm_write_write_index(int fd, int64_t pos);
1513
void ffm_set_write_index(AVFormatContext *s, int64_t pos, int64_t file_size);
1514

    
1515
/**
1516
 * Attempt to find a specific tag in a URL.
1517
 *
1518
 * syntax: '?tag1=val1&tag2=val2...'. Little URL decoding is done.
1519
 * Return 1 if found.
1520
 */
1521
int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
1522

    
1523
/**
1524
 * Return in 'buf' the path with '%d' replaced by a number.
1525
 *
1526
 * Also handles the '%0nd' format where 'n' is the total number
1527
 * of digits and '%%'.
1528
 *
1529
 * @param buf destination buffer
1530
 * @param buf_size destination buffer size
1531
 * @param path numbered sequence string
1532
 * @param number frame number
1533
 * @return 0 if OK, -1 on format error
1534
 */
1535
int av_get_frame_filename(char *buf, int buf_size,
1536
                          const char *path, int number);
1537

    
1538
/**
1539
 * Check whether filename actually is a numbered sequence generator.
1540
 *
1541
 * @param filename possible numbered sequence string
1542
 * @return 1 if a valid numbered sequence string, 0 otherwise
1543
 */
1544
int av_filename_number_test(const char *filename);
1545

    
1546
/**
1547
 * Generate an SDP for an RTP session.
1548
 *
1549
 * @param ac array of AVFormatContexts describing the RTP streams. If the
1550
 *           array is composed by only one context, such context can contain
1551
 *           multiple AVStreams (one AVStream per RTP stream). Otherwise,
1552
 *           all the contexts in the array (an AVCodecContext per RTP stream)
1553
 *           must contain only one AVStream.
1554
 * @param n_files number of AVCodecContexts contained in ac
1555
 * @param buff buffer where the SDP will be stored (must be allocated by
1556
 *             the caller)
1557
 * @param size the size of the buffer
1558
 * @return 0 if OK, AVERROR_xxx on error
1559
 */
1560
int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size);
1561

    
1562
/**
1563
 * Return a positive value if the given filename has one of the given
1564
 * extensions, 0 otherwise.
1565
 *
1566
 * @param extensions a comma-separated list of filename extensions
1567
 */
1568
int av_match_ext(const char *filename, const char *extensions);
1569

    
1570
#endif /* AVFORMAT_AVFORMAT_H */