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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. Multiple languages can be specified by
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 *                 separating them with commas.
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 * performer    -- artist who performed the work, if different from artist.
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 *                 E.g for "Also sprach Zarathustra", artist would be "Richard
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 *                 Strauss" and performer "London Philharmonic Orchestra".
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 * publisher    -- name of the label/publisher.
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 * service_name     -- name of the service in broadcasting (channel name).
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 * service_provider -- name of the service provider in broadcasting.
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 * title        -- name of the work.
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 * track        -- number of this work in the set, can be in form current/total.
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 */
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#define AV_METADATA_MATCH_CASE      1
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#define AV_METADATA_IGNORE_SUFFIX   2
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#define AV_METADATA_DONT_STRDUP_KEY 4
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#define AV_METADATA_DONT_STRDUP_VAL 8
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#define AV_METADATA_DONT_OVERWRITE 16   ///< Don't overwrite existing tags.
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typedef struct {
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    char *key;
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    char *value;
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}AVMetadataTag;
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typedef struct AVMetadata AVMetadata;
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#if FF_API_OLD_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_RAWPICTURE,
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     * AVFMT_GLOBALHEADER, AVFMT_NOTIMESTAMPS, AVFMT_VARIABLE_FPS,
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     * AVFMT_NODIMENSIONS, AVFMT_NOSTREAMS
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     */
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    int flags;
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    /**
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     * Currently only used to set pixel format if not YUV420P.
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     */
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    int (*set_parameters)(struct AVFormatContext *, AVFormatParameters *);
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    int (*interleave_packet)(struct AVFormatContext *, AVPacket *out,
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                             AVPacket *in, int flush);
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    /**
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     * List of supported codec_id-codec_tag pairs, ordered by "better
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     * choice first". The arrays are all terminated by CODEC_ID_NONE.
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     */
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    const struct AVCodecTag * const *codec_tag;
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    enum CodecID subtitle_codec; /**< default subtitle codec */
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#if FF_API_OLD_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
475
 * even when user did not explicitly ask for subtitles.
476
 */
477
#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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/**
483
 * Stream structure.
484
 * New fields can be added to the end with minor version bumps.
485
 * Removal, reordering and changes to existing fields require a major
486
 * version bump.
487
 * sizeof(AVStream) must not be used outside libav*.
488
 */
489
typedef struct AVStream {
490
    int index;    /**< stream index in AVFormatContext */
491
    int id;       /**< format-specific stream ID */
492
    AVCodecContext *codec; /**< codec context */
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    /**
494
     * Real base framerate of the stream.
495
     * This is the lowest framerate with which all timestamps can be
496
     * 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.
500
     */
501
    AVRational r_frame_rate;
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    void *priv_data;
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504
    /* internal data used in av_find_stream_info() */
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    int64_t first_dts;
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    /**
508
     * encoding: pts generation when outputting stream
509
     */
510
    struct AVFrac pts;
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512
    /**
513
     * This is the fundamental unit of time (in seconds) in terms
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     * of which frame timestamps are represented. For fixed-fps content,
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     * 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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    /**
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     * Quality, as it has been removed from AVCodecContext and put in AVVideoFrame.
528
     * MN: dunno if that is the right place for it
529
     */
530
    float quality;
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532
    /**
533
     * Decoding: pts of the first frame of the stream, in stream time base.
534
     * 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.
536
     * 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.
539
     */
540
    int64_t start_time;
541

    
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    /**
543
     * Decoding: duration of the stream, in stream time base.
544
     * If a source file does not specify a duration, but does specify
545
     * a bitrate, this value will be estimated from bitrate and file size.
546
     */
547
    int64_t duration;
548

    
549
#if FF_API_OLD_METADATA
550
    attribute_deprecated char language[4]; /**< ISO 639-2/B 3-letter language code (empty string if undefined) */
551
#endif
552

    
553
    /* av_read_frame() support */
554
    enum AVStreamParseType need_parsing;
555
    struct AVCodecParserContext *parser;
556

    
557
    int64_t cur_dts;
558
    int last_IP_duration;
559
    int64_t last_IP_pts;
560
    /* av_seek_frame() support */
561
    AVIndexEntry *index_entries; /**< Only used if the format does not
562
                                    support seeking natively. */
563
    int nb_index_entries;
564
    unsigned int index_entries_allocated_size;
565

    
566
    int64_t nb_frames;                 ///< number of frames in this stream if known or 0
567

    
568
#if FF_API_LAVF_UNUSED
569
    attribute_deprecated int64_t unused[4+1];
570
#endif
571

    
572
#if FF_API_OLD_METADATA
573
    attribute_deprecated char *filename; /**< source filename of the stream */
574
#endif
575

    
576
    int disposition; /**< AV_DISPOSITION_* bit field */
577

    
578
    AVProbeData probe_data;
579
#define MAX_REORDER_DELAY 16
580
    int64_t pts_buffer[MAX_REORDER_DELAY+1];
581

    
582
    /**
583
     * sample aspect ratio (0 if unknown)
584
     * - encoding: Set by user.
585
     * - decoding: Set by libavformat.
586
     */
587
    AVRational sample_aspect_ratio;
588

    
589
    AVMetadata *metadata;
590

    
591
    /* Intended mostly for av_read_frame() support. Not supposed to be used by */
592
    /* external applications; try to use something else if at all possible.    */
593
    const uint8_t *cur_ptr;
594
    int cur_len;
595
    AVPacket cur_pkt;
596

    
597
    // Timestamp generation support:
598
    /**
599
     * Timestamp corresponding to the last dts sync point.
600
     *
601
     * Initialized when AVCodecParserContext.dts_sync_point >= 0 and
602
     * a DTS is received from the underlying container. Otherwise set to
603
     * AV_NOPTS_VALUE by default.
604
     */
605
    int64_t reference_dts;
606

    
607
    /**
608
     * Number of packets to buffer for codec probing
609
     * NOT PART OF PUBLIC API
610
     */
611
#define MAX_PROBE_PACKETS 2500
612
    int probe_packets;
613

    
614
    /**
615
     * last packet in packet_buffer for this stream when muxing.
616
     * used internally, NOT PART OF PUBLIC API, dont read or write from outside of libav*
617
     */
618
    struct AVPacketList *last_in_packet_buffer;
619

    
620
    /**
621
     * Average framerate
622
     */
623
    AVRational avg_frame_rate;
624

    
625
    /**
626
     * Number of frames that have been demuxed during av_find_stream_info()
627
     */
628
    int codec_info_nb_frames;
629

    
630
    /**
631
     * Stream informations used internally by av_find_stream_info()
632
     */
633
#define MAX_STD_TIMEBASES (60*12+5)
634
    struct {
635
        int64_t last_dts;
636
        int64_t duration_gcd;
637
        int duration_count;
638
        double duration_error[MAX_STD_TIMEBASES];
639
        int64_t codec_info_duration;
640
    } *info;
641
} AVStream;
642

    
643
#define AV_PROGRAM_RUNNING 1
644

    
645
/**
646
 * New fields can be added to the end with minor version bumps.
647
 * Removal, reordering and changes to existing fields require a major
648
 * version bump.
649
 * sizeof(AVProgram) must not be used outside libav*.
650
 */
651
typedef struct AVProgram {
652
    int            id;
653
#if FF_API_OLD_METADATA
654
    attribute_deprecated char           *provider_name; ///< network name for DVB streams
655
    attribute_deprecated char           *name;          ///< service name for DVB streams
656
#endif
657
    int            flags;
658
    enum AVDiscard discard;        ///< selects which program to discard and which to feed to the caller
659
    unsigned int   *stream_index;
660
    unsigned int   nb_stream_indexes;
661
    AVMetadata *metadata;
662
} AVProgram;
663

    
664
#define AVFMTCTX_NOHEADER      0x0001 /**< signal that no header is present
665
                                         (streams are added dynamically) */
666

    
667
typedef struct AVChapter {
668
    int id;                 ///< unique ID to identify the chapter
669
    AVRational time_base;   ///< time base in which the start/end timestamps are specified
670
    int64_t start, end;     ///< chapter start/end time in time_base units
671
#if FF_API_OLD_METADATA
672
    attribute_deprecated char *title;            ///< chapter title
673
#endif
674
    AVMetadata *metadata;
675
} AVChapter;
676

    
677
#if FF_API_MAX_STREAMS
678
#define MAX_STREAMS 20
679
#endif
680

    
681
/**
682
 * Format I/O context.
683
 * New fields can be added to the end with minor version bumps.
684
 * Removal, reordering and changes to existing fields require a major
685
 * version bump.
686
 * sizeof(AVFormatContext) must not be used outside libav*.
687
 */
688
typedef struct AVFormatContext {
689
    const AVClass *av_class; /**< Set by avformat_alloc_context. */
690
    /* Can only be iformat or oformat, not both at the same time. */
691
    struct AVInputFormat *iformat;
692
    struct AVOutputFormat *oformat;
693
    void *priv_data;
694
    AVIOContext *pb;
695
    unsigned int nb_streams;
696
#if FF_API_MAX_STREAMS
697
    AVStream *streams[MAX_STREAMS];
698
#else
699
    AVStream **streams;
700
#endif
701
    char filename[1024]; /**< input or output filename */
702
    /* stream info */
703
    int64_t timestamp;
704
#if FF_API_OLD_METADATA
705
    attribute_deprecated char title[512];
706
    attribute_deprecated char author[512];
707
    attribute_deprecated char copyright[512];
708
    attribute_deprecated char comment[512];
709
    attribute_deprecated char album[512];
710
    attribute_deprecated int year;  /**< ID3 year, 0 if none */
711
    attribute_deprecated int track; /**< track number, 0 if none */
712
    attribute_deprecated char genre[32]; /**< ID3 genre */
713
#endif
714

    
715
    int ctx_flags; /**< Format-specific flags, see AVFMTCTX_xx */
716
    /* private data for pts handling (do not modify directly). */
717
    /**
718
     * This buffer is only needed when packets were already buffered but
719
     * not decoded, for example to get the codec parameters in MPEG
720
     * streams.
721
     */
722
    struct AVPacketList *packet_buffer;
723

    
724
    /**
725
     * Decoding: position of the first frame of the component, in
726
     * AV_TIME_BASE fractional seconds. NEVER set this value directly:
727
     * It is deduced from the AVStream values.
728
     */
729
    int64_t start_time;
730

    
731
    /**
732
     * Decoding: duration of the stream, in AV_TIME_BASE fractional
733
     * seconds. Only set this value if you know none of the individual stream
734
     * durations and also dont set any of them. This is deduced from the
735
     * AVStream values if not set.
736
     */
737
    int64_t duration;
738

    
739
    /**
740
     * decoding: total file size, 0 if unknown
741
     */
742
    int64_t file_size;
743

    
744
    /**
745
     * Decoding: total stream bitrate in bit/s, 0 if not
746
     * available. Never set it directly if the file_size and the
747
     * duration are known as FFmpeg can compute it automatically.
748
     */
749
    int bit_rate;
750

    
751
    /* av_read_frame() support */
752
    AVStream *cur_st;
753
#if FF_API_LAVF_UNUSED
754
    const uint8_t *cur_ptr_deprecated;
755
    int cur_len_deprecated;
756
    AVPacket cur_pkt_deprecated;
757
#endif
758

    
759
    /* av_seek_frame() support */
760
    int64_t data_offset; /**< offset of the first packet */
761
#if FF_API_INDEX_BUILT
762
    attribute_deprecated int index_built;
763
#endif
764

    
765
    int mux_rate;
766
    unsigned int packet_size;
767
    int preload;
768
    int max_delay;
769

    
770
#define AVFMT_NOOUTPUTLOOP -1
771
#define AVFMT_INFINITEOUTPUTLOOP 0
772
    /**
773
     * number of times to loop output in formats that support it
774
     */
775
    int loop_output;
776

    
777
    int flags;
778
#define AVFMT_FLAG_GENPTS       0x0001 ///< Generate missing pts even if it requires parsing future frames.
779
#define AVFMT_FLAG_IGNIDX       0x0002 ///< Ignore index.
780
#define AVFMT_FLAG_NONBLOCK     0x0004 ///< Do not block when reading packets from input.
781
#define AVFMT_FLAG_IGNDTS       0x0008 ///< Ignore DTS on frames that contain both DTS & PTS
782
#define AVFMT_FLAG_NOFILLIN     0x0010 ///< Do not infer any values from other values, just return what is stored in the container
783
#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
784
#define AVFMT_FLAG_RTP_HINT     0x0040 ///< Add RTP hinting to the output file
785

    
786
    int loop_input;
787

    
788
    /**
789
     * decoding: size of data to probe; encoding: unused.
790
     */
791
    unsigned int probesize;
792

    
793
    /**
794
     * Maximum time (in AV_TIME_BASE units) during which the input should
795
     * be analyzed in av_find_stream_info().
796
     */
797
    int max_analyze_duration;
798

    
799
    const uint8_t *key;
800
    int keylen;
801

    
802
    unsigned int nb_programs;
803
    AVProgram **programs;
804

    
805
    /**
806
     * Forced video codec_id.
807
     * Demuxing: Set by user.
808
     */
809
    enum CodecID video_codec_id;
810

    
811
    /**
812
     * Forced audio codec_id.
813
     * Demuxing: Set by user.
814
     */
815
    enum CodecID audio_codec_id;
816

    
817
    /**
818
     * Forced subtitle codec_id.
819
     * Demuxing: Set by user.
820
     */
821
    enum CodecID subtitle_codec_id;
822

    
823
    /**
824
     * Maximum amount of memory in bytes to use for the index of each stream.
825
     * If the index exceeds this size, entries will be discarded as
826
     * needed to maintain a smaller size. This can lead to slower or less
827
     * accurate seeking (depends on demuxer).
828
     * Demuxers for which a full in-memory index is mandatory will ignore
829
     * this.
830
     * muxing  : unused
831
     * demuxing: set by user
832
     */
833
    unsigned int max_index_size;
834

    
835
    /**
836
     * Maximum amount of memory in bytes to use for buffering frames
837
     * obtained from realtime capture devices.
838
     */
839
    unsigned int max_picture_buffer;
840

    
841
    unsigned int nb_chapters;
842
    AVChapter **chapters;
843

    
844
    /**
845
     * Flags to enable debugging.
846
     */
847
    int debug;
848
#define FF_FDEBUG_TS        0x0001
849

    
850
    /**
851
     * Raw packets from the demuxer, prior to parsing and decoding.
852
     * This buffer is used for buffering packets until the codec can
853
     * be identified, as parsing cannot be done without knowing the
854
     * codec.
855
     */
856
    struct AVPacketList *raw_packet_buffer;
857
    struct AVPacketList *raw_packet_buffer_end;
858

    
859
    struct AVPacketList *packet_buffer_end;
860

    
861
    AVMetadata *metadata;
862

    
863
    /**
864
     * Remaining size available for raw_packet_buffer, in bytes.
865
     * NOT PART OF PUBLIC API
866
     */
867
#define RAW_PACKET_BUFFER_SIZE 2500000
868
    int raw_packet_buffer_remaining_size;
869

    
870
    /**
871
     * Start time of the stream in real world time, in microseconds
872
     * since the unix epoch (00:00 1st January 1970). That is, pts=0
873
     * in the stream was captured at this real world time.
874
     * - encoding: Set by user.
875
     * - decoding: Unused.
876
     */
877
    int64_t start_time_realtime;
878
} AVFormatContext;
879

    
880
typedef struct AVPacketList {
881
    AVPacket pkt;
882
    struct AVPacketList *next;
883
} AVPacketList;
884

    
885
#if FF_API_FIRST_FORMAT
886
attribute_deprecated extern AVInputFormat *first_iformat;
887
attribute_deprecated extern AVOutputFormat *first_oformat;
888
#endif
889

    
890
/**
891
 * If f is NULL, returns the first registered input format,
892
 * if f is non-NULL, returns the next registered input format after f
893
 * or NULL if f is the last one.
894
 */
895
AVInputFormat  *av_iformat_next(AVInputFormat  *f);
896

    
897
/**
898
 * If f is NULL, returns the first registered output format,
899
 * if f is non-NULL, returns the next registered output format after f
900
 * or NULL if f is the last one.
901
 */
902
AVOutputFormat *av_oformat_next(AVOutputFormat *f);
903

    
904
enum CodecID av_guess_image2_codec(const char *filename);
905

    
906
/* XXX: Use automatic init with either ELF sections or C file parser */
907
/* modules. */
908

    
909
/* utils.c */
910
void av_register_input_format(AVInputFormat *format);
911
void av_register_output_format(AVOutputFormat *format);
912
#if FF_API_GUESS_FORMAT
913
attribute_deprecated AVOutputFormat *guess_stream_format(const char *short_name,
914
                                    const char *filename,
915
                                    const char *mime_type);
916

    
917
/**
918
 * @deprecated Use av_guess_format() instead.
919
 */
920
attribute_deprecated AVOutputFormat *guess_format(const char *short_name,
921
                                                  const char *filename,
922
                                                  const char *mime_type);
923
#endif
924

    
925
/**
926
 * Return the output format in the list of registered output formats
927
 * which best matches the provided parameters, or return NULL if
928
 * there is no match.
929
 *
930
 * @param short_name if non-NULL checks if short_name matches with the
931
 * names of the registered formats
932
 * @param filename if non-NULL checks if filename terminates with the
933
 * extensions of the registered formats
934
 * @param mime_type if non-NULL checks if mime_type matches with the
935
 * MIME type of the registered formats
936
 */
937
AVOutputFormat *av_guess_format(const char *short_name,
938
                                const char *filename,
939
                                const char *mime_type);
940

    
941
/**
942
 * Guess the codec ID based upon muxer and filename.
943
 */
944
enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
945
                            const char *filename, const char *mime_type,
946
                            enum AVMediaType type);
947

    
948
/**
949
 * Send a nice hexadecimal dump of a buffer to the specified file stream.
950
 *
951
 * @param f The file stream pointer where the dump should be sent to.
952
 * @param buf buffer
953
 * @param size buffer size
954
 *
955
 * @see av_hex_dump_log, av_pkt_dump2, av_pkt_dump_log2
956
 */
957
void av_hex_dump(FILE *f, uint8_t *buf, int size);
958

    
959
/**
960
 * Send a nice hexadecimal dump of a buffer to the log.
961
 *
962
 * @param avcl A pointer to an arbitrary struct of which the first field is a
963
 * pointer to an AVClass struct.
964
 * @param level The importance level of the message, lower values signifying
965
 * higher importance.
966
 * @param buf buffer
967
 * @param size buffer size
968
 *
969
 * @see av_hex_dump, av_pkt_dump2, av_pkt_dump_log2
970
 */
971
void av_hex_dump_log(void *avcl, int level, uint8_t *buf, int size);
972

    
973
/**
974
 * Send a nice dump of a packet to the specified file stream.
975
 *
976
 * @param f The file stream pointer where the dump should be sent to.
977
 * @param pkt packet to dump
978
 * @param dump_payload True if the payload must be displayed, too.
979
 * @param st AVStream that the packet belongs to
980
 */
981
void av_pkt_dump2(FILE *f, AVPacket *pkt, int dump_payload, AVStream *st);
982

    
983
attribute_deprecated void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
984

    
985
/**
986
 * Send a nice dump of a packet to the log.
987
 *
988
 * @param avcl A pointer to an arbitrary struct of which the first field is a
989
 * pointer to an AVClass struct.
990
 * @param level The importance level of the message, lower values signifying
991
 * higher importance.
992
 * @param pkt packet to dump
993
 * @param dump_payload True if the payload must be displayed, too.
994
 * @param st AVStream that the packet belongs to
995
 */
996
void av_pkt_dump_log2(void *avcl, int level, AVPacket *pkt, int dump_payload,
997
                      AVStream *st);
998

    
999
attribute_deprecated void av_pkt_dump_log(void *avcl, int level, AVPacket *pkt,
1000
                                          int dump_payload);
1001

    
1002
/**
1003
 * Initialize libavformat and register all the muxers, demuxers and
1004
 * protocols. If you do not call this function, then you can select
1005
 * exactly which formats you want to support.
1006
 *
1007
 * @see av_register_input_format()
1008
 * @see av_register_output_format()
1009
 * @see av_register_protocol()
1010
 */
1011
void av_register_all(void);
1012

    
1013
/**
1014
 * Get the CodecID for the given codec tag tag.
1015
 * If no codec id is found returns CODEC_ID_NONE.
1016
 *
1017
 * @param tags list of supported codec_id-codec_tag pairs, as stored
1018
 * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
1019
 */
1020
enum CodecID av_codec_get_id(const struct AVCodecTag * const *tags, unsigned int tag);
1021

    
1022
/**
1023
 * Get the codec tag for the given codec id id.
1024
 * If no codec tag is found returns 0.
1025
 *
1026
 * @param tags list of supported codec_id-codec_tag pairs, as stored
1027
 * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
1028
 */
1029
unsigned int av_codec_get_tag(const struct AVCodecTag * const *tags, enum CodecID id);
1030

    
1031
/* media file input */
1032

    
1033
/**
1034
 * Find AVInputFormat based on the short name of the input format.
1035
 */
1036
AVInputFormat *av_find_input_format(const char *short_name);
1037

    
1038
/**
1039
 * Guess the file format.
1040
 *
1041
 * @param is_opened Whether the file is already opened; determines whether
1042
 *                  demuxers with or without AVFMT_NOFILE are probed.
1043
 */
1044
AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
1045

    
1046
/**
1047
 * Guess the file format.
1048
 *
1049
 * @param is_opened Whether the file is already opened; determines whether
1050
 *                  demuxers with or without AVFMT_NOFILE are probed.
1051
 * @param score_max A probe score larger that this is required to accept a
1052
 *                  detection, the variable is set to the actual detection
1053
 *                  score afterwards.
1054
 *                  If the score is <= AVPROBE_SCORE_MAX / 4 it is recommended
1055
 *                  to retry with a larger probe buffer.
1056
 */
1057
AVInputFormat *av_probe_input_format2(AVProbeData *pd, int is_opened, int *score_max);
1058

    
1059
/**
1060
 * Probe a bytestream to determine the input format. Each time a probe returns
1061
 * with a score that is too low, the probe buffer size is increased and another
1062
 * attempt is made. When the maximum probe size is reached, the input format
1063
 * with the highest score is returned.
1064
 *
1065
 * @param pb the bytestream to probe
1066
 * @param fmt the input format is put here
1067
 * @param filename the filename of the stream
1068
 * @param logctx the log context
1069
 * @param offset the offset within the bytestream to probe from
1070
 * @param max_probe_size the maximum probe buffer size (zero for default)
1071
 * @return 0 in case of success, a negative value corresponding to an
1072
 * AVERROR code otherwise
1073
 */
1074
int av_probe_input_buffer(AVIOContext *pb, AVInputFormat **fmt,
1075
                          const char *filename, void *logctx,
1076
                          unsigned int offset, unsigned int max_probe_size);
1077

    
1078
/**
1079
 * Allocate all the structures needed to read an input stream.
1080
 *        This does not open the needed codecs for decoding the stream[s].
1081
 */
1082
int av_open_input_stream(AVFormatContext **ic_ptr,
1083
                         AVIOContext *pb, const char *filename,
1084
                         AVInputFormat *fmt, AVFormatParameters *ap);
1085

    
1086
/**
1087
 * Open a media file as input. The codecs are not opened. Only the file
1088
 * header (if present) is read.
1089
 *
1090
 * @param ic_ptr The opened media file handle is put here.
1091
 * @param filename filename to open
1092
 * @param fmt If non-NULL, force the file format to use.
1093
 * @param buf_size optional buffer size (zero if default is OK)
1094
 * @param ap Additional parameters needed when opening the file
1095
 *           (NULL if default).
1096
 * @return 0 if OK, AVERROR_xxx otherwise
1097
 */
1098
int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
1099
                       AVInputFormat *fmt,
1100
                       int buf_size,
1101
                       AVFormatParameters *ap);
1102

    
1103
#if FF_API_ALLOC_FORMAT_CONTEXT
1104
/**
1105
 * @deprecated Use avformat_alloc_context() instead.
1106
 */
1107
attribute_deprecated AVFormatContext *av_alloc_format_context(void);
1108
#endif
1109

    
1110
/**
1111
 * Allocate an AVFormatContext.
1112
 * avformat_free_context() can be used to free the context and everything
1113
 * allocated by the framework within it.
1114
 */
1115
AVFormatContext *avformat_alloc_context(void);
1116

    
1117
/**
1118
 * Read packets of a media file to get stream information. This
1119
 * is useful for file formats with no headers such as MPEG. This
1120
 * function also computes the real framerate in case of MPEG-2 repeat
1121
 * frame mode.
1122
 * The logical file position is not changed by this function;
1123
 * examined packets may be buffered for later processing.
1124
 *
1125
 * @param ic media file handle
1126
 * @return >=0 if OK, AVERROR_xxx on error
1127
 * @todo Let the user decide somehow what information is needed so that
1128
 *       we do not waste time getting stuff the user does not need.
1129
 */
1130
int av_find_stream_info(AVFormatContext *ic);
1131

    
1132
/**
1133
 * Find the "best" stream in the file.
1134
 * The best stream is determined according to various heuristics as the most
1135
 * likely to be what the user expects.
1136
 * If the decoder parameter is non-NULL, av_find_best_stream will find the
1137
 * default decoder for the stream's codec; streams for which no decoder can
1138
 * be found are ignored.
1139
 *
1140
 * @param ic                media file handle
1141
 * @param type              stream type: video, audio, subtitles, etc.
1142
 * @param wanted_stream_nb  user-requested stream number,
1143
 *                          or -1 for automatic selection
1144
 * @param related_stream    try to find a stream related (eg. in the same
1145
 *                          program) to this one, or -1 if none
1146
 * @param decoder_ret       if non-NULL, returns the decoder for the
1147
 *                          selected stream
1148
 * @param flags             flags; none are currently defined
1149
 * @return  the non-negative stream number in case of success,
1150
 *          AVERROR_STREAM_NOT_FOUND if no stream with the requested type
1151
 *          could be found,
1152
 *          AVERROR_DECODER_NOT_FOUND if streams were found but no decoder
1153
 * @note  If av_find_best_stream returns successfully and decoder_ret is not
1154
 *        NULL, then *decoder_ret is guaranteed to be set to a valid AVCodec.
1155
 */
1156
int av_find_best_stream(AVFormatContext *ic,
1157
                        enum AVMediaType type,
1158
                        int wanted_stream_nb,
1159
                        int related_stream,
1160
                        AVCodec **decoder_ret,
1161
                        int flags);
1162

    
1163
/**
1164
 * Read a transport packet from a media file.
1165
 *
1166
 * This function is obsolete and should never be used.
1167
 * Use av_read_frame() instead.
1168
 *
1169
 * @param s media file handle
1170
 * @param pkt is filled
1171
 * @return 0 if OK, AVERROR_xxx on error
1172
 */
1173
int av_read_packet(AVFormatContext *s, AVPacket *pkt);
1174

    
1175
/**
1176
 * Return the next frame of a stream.
1177
 * This function returns what is stored in the file, and does not validate
1178
 * that what is there are valid frames for the decoder. It will split what is
1179
 * stored in the file into frames and return one for each call. It will not
1180
 * omit invalid data between valid frames so as to give the decoder the maximum
1181
 * information possible for decoding.
1182
 *
1183
 * The returned packet is valid
1184
 * until the next av_read_frame() or until av_close_input_file() and
1185
 * must be freed with av_free_packet. For video, the packet contains
1186
 * exactly one frame. For audio, it contains an integer number of
1187
 * frames if each frame has a known fixed size (e.g. PCM or ADPCM
1188
 * data). If the audio frames have a variable size (e.g. MPEG audio),
1189
 * then it contains one frame.
1190
 *
1191
 * pkt->pts, pkt->dts and pkt->duration are always set to correct
1192
 * values in AVStream.time_base units (and guessed if the format cannot
1193
 * provide them). pkt->pts can be AV_NOPTS_VALUE if the video format
1194
 * has B-frames, so it is better to rely on pkt->dts if you do not
1195
 * decompress the payload.
1196
 *
1197
 * @return 0 if OK, < 0 on error or end of file
1198
 */
1199
int av_read_frame(AVFormatContext *s, AVPacket *pkt);
1200

    
1201
/**
1202
 * Seek to the keyframe at timestamp.
1203
 * 'timestamp' in 'stream_index'.
1204
 * @param stream_index If stream_index is (-1), a default
1205
 * stream is selected, and timestamp is automatically converted
1206
 * from AV_TIME_BASE units to the stream specific time_base.
1207
 * @param timestamp Timestamp in AVStream.time_base units
1208
 *        or, if no stream is specified, in AV_TIME_BASE units.
1209
 * @param flags flags which select direction and seeking mode
1210
 * @return >= 0 on success
1211
 */
1212
int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp,
1213
                  int flags);
1214

    
1215
/**
1216
 * Seek to timestamp ts.
1217
 * Seeking will be done so that the point from which all active streams
1218
 * can be presented successfully will be closest to ts and within min/max_ts.
1219
 * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
1220
 *
1221
 * If flags contain AVSEEK_FLAG_BYTE, then all timestamps are in bytes and
1222
 * are the file position (this may not be supported by all demuxers).
1223
 * If flags contain AVSEEK_FLAG_FRAME, then all timestamps are in frames
1224
 * in the stream with stream_index (this may not be supported by all demuxers).
1225
 * Otherwise all timestamps are in units of the stream selected by stream_index
1226
 * or if stream_index is -1, in AV_TIME_BASE units.
1227
 * If flags contain AVSEEK_FLAG_ANY, then non-keyframes are treated as
1228
 * keyframes (this may not be supported by all demuxers).
1229
 *
1230
 * @param stream_index index of the stream which is used as time base reference
1231
 * @param min_ts smallest acceptable timestamp
1232
 * @param ts target timestamp
1233
 * @param max_ts largest acceptable timestamp
1234
 * @param flags flags
1235
 * @return >=0 on success, error code otherwise
1236
 *
1237
 * @note This is part of the new seek API which is still under construction.
1238
 *       Thus do not use this yet. It may change at any time, do not expect
1239
 *       ABI compatibility yet!
1240
 */
1241
int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
1242

    
1243
/**
1244
 * Start playing a network-based stream (e.g. RTSP stream) at the
1245
 * current position.
1246
 */
1247
int av_read_play(AVFormatContext *s);
1248

    
1249
/**
1250
 * Pause a network-based stream (e.g. RTSP stream).
1251
 *
1252
 * Use av_read_play() to resume it.
1253
 */
1254
int av_read_pause(AVFormatContext *s);
1255

    
1256
/**
1257
 * Free a AVFormatContext allocated by av_open_input_stream.
1258
 * @param s context to free
1259
 */
1260
void av_close_input_stream(AVFormatContext *s);
1261

    
1262
/**
1263
 * Close a media file (but not its codecs).
1264
 *
1265
 * @param s media file handle
1266
 */
1267
void av_close_input_file(AVFormatContext *s);
1268

    
1269
/**
1270
 * Free an AVFormatContext and all its streams.
1271
 * @param s context to free
1272
 */
1273
void avformat_free_context(AVFormatContext *s);
1274

    
1275
/**
1276
 * Add a new stream to a media file.
1277
 *
1278
 * Can only be called in the read_header() function. If the flag
1279
 * AVFMTCTX_NOHEADER is in the format context, then new streams
1280
 * can be added in read_packet too.
1281
 *
1282
 * @param s media file handle
1283
 * @param id file-format-dependent stream ID
1284
 */
1285
AVStream *av_new_stream(AVFormatContext *s, int id);
1286
AVProgram *av_new_program(AVFormatContext *s, int id);
1287

    
1288
/**
1289
 * Set the pts for a given stream. If the new values would be invalid
1290
 * (<= 0), it leaves the AVStream unchanged.
1291
 *
1292
 * @param s stream
1293
 * @param pts_wrap_bits number of bits effectively used by the pts
1294
 *        (used for wrap control, 33 is the value for MPEG)
1295
 * @param pts_num numerator to convert to seconds (MPEG: 1)
1296
 * @param pts_den denominator to convert to seconds (MPEG: 90000)
1297
 */
1298
void av_set_pts_info(AVStream *s, int pts_wrap_bits,
1299
                     unsigned int pts_num, unsigned int pts_den);
1300

    
1301
#define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
1302
#define AVSEEK_FLAG_BYTE     2 ///< seeking based on position in bytes
1303
#define AVSEEK_FLAG_ANY      4 ///< seek to any frame, even non-keyframes
1304
#define AVSEEK_FLAG_FRAME    8 ///< seeking based on frame number
1305

    
1306
int av_find_default_stream_index(AVFormatContext *s);
1307

    
1308
/**
1309
 * Get the index for a specific timestamp.
1310
 * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond
1311
 *                 to the timestamp which is <= the requested one, if backward
1312
 *                 is 0, then it will be >=
1313
 *              if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
1314
 * @return < 0 if no such timestamp could be found
1315
 */
1316
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
1317

    
1318
/**
1319
 * Add an index entry into a sorted list. Update the entry if the list
1320
 * already contains it.
1321
 *
1322
 * @param timestamp timestamp in the time base of the given stream
1323
 */
1324
int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp,
1325
                       int size, int distance, int flags);
1326

    
1327
/**
1328
 * Perform a binary search using av_index_search_timestamp() and
1329
 * AVInputFormat.read_timestamp().
1330
 * This is not supposed to be called directly by a user application,
1331
 * but by demuxers.
1332
 * @param target_ts target timestamp in the time base of the given stream
1333
 * @param stream_index stream number
1334
 */
1335
int av_seek_frame_binary(AVFormatContext *s, int stream_index,
1336
                         int64_t target_ts, int flags);
1337

    
1338
/**
1339
 * Update cur_dts of all streams based on the given timestamp and AVStream.
1340
 *
1341
 * Stream ref_st unchanged, others set cur_dts in their native time base.
1342
 * Only needed for timestamp wrapping or if (dts not set and pts!=dts).
1343
 * @param timestamp new dts expressed in time_base of param ref_st
1344
 * @param ref_st reference stream giving time_base of param timestamp
1345
 */
1346
void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
1347

    
1348
/**
1349
 * Perform a binary search using read_timestamp().
1350
 * This is not supposed to be called directly by a user application,
1351
 * but by demuxers.
1352
 * @param target_ts target timestamp in the time base of the given stream
1353
 * @param stream_index stream number
1354
 */
1355
int64_t av_gen_search(AVFormatContext *s, int stream_index,
1356
                      int64_t target_ts, int64_t pos_min,
1357
                      int64_t pos_max, int64_t pos_limit,
1358
                      int64_t ts_min, int64_t ts_max,
1359
                      int flags, int64_t *ts_ret,
1360
                      int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
1361

    
1362
/**
1363
 * media file output
1364
 */
1365
int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
1366

    
1367
/**
1368
 * Split a URL string into components.
1369
 *
1370
 * The pointers to buffers for storing individual components may be null,
1371
 * in order to ignore that component. Buffers for components not found are
1372
 * set to empty strings. If the port is not found, it is set to a negative
1373
 * value.
1374
 *
1375
 * @param proto the buffer for the protocol
1376
 * @param proto_size the size of the proto buffer
1377
 * @param authorization the buffer for the authorization
1378
 * @param authorization_size the size of the authorization buffer
1379
 * @param hostname the buffer for the host name
1380
 * @param hostname_size the size of the hostname buffer
1381
 * @param port_ptr a pointer to store the port number in
1382
 * @param path the buffer for the path
1383
 * @param path_size the size of the path buffer
1384
 * @param url the URL to split
1385
 */
1386
void av_url_split(char *proto,         int proto_size,
1387
                  char *authorization, int authorization_size,
1388
                  char *hostname,      int hostname_size,
1389
                  int *port_ptr,
1390
                  char *path,          int path_size,
1391
                  const char *url);
1392

    
1393
/**
1394
 * Allocate the stream private data and write the stream header to an
1395
 * output media file.
1396
 * @note: this sets stream time-bases, if possible to stream->codec->time_base
1397
 * but for some formats it might also be some other time base
1398
 *
1399
 * @param s media file handle
1400
 * @return 0 if OK, AVERROR_xxx on error
1401
 */
1402
int av_write_header(AVFormatContext *s);
1403

    
1404
/**
1405
 * Write a packet to an output media file.
1406
 *
1407
 * The packet shall contain one audio or video frame.
1408
 * The packet must be correctly interleaved according to the container
1409
 * specification, if not then av_interleaved_write_frame must be used.
1410
 *
1411
 * @param s media file handle
1412
 * @param pkt The packet, which contains the stream_index, buf/buf_size,
1413
              dts/pts, ...
1414
 * @return < 0 on error, = 0 if OK, 1 if end of stream wanted
1415
 */
1416
int av_write_frame(AVFormatContext *s, AVPacket *pkt);
1417

    
1418
/**
1419
 * Write a packet to an output media file ensuring correct interleaving.
1420
 *
1421
 * The packet must contain one audio or video frame.
1422
 * If the packets are already correctly interleaved, the application should
1423
 * call av_write_frame() instead as it is slightly faster. It is also important
1424
 * to keep in mind that completely non-interleaved input will need huge amounts
1425
 * of memory to interleave with this, so it is preferable to interleave at the
1426
 * demuxer level.
1427
 *
1428
 * @param s media file handle
1429
 * @param pkt The packet, which contains the stream_index, buf/buf_size,
1430
              dts/pts, ...
1431
 * @return < 0 on error, = 0 if OK, 1 if end of stream wanted
1432
 */
1433
int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
1434

    
1435
/**
1436
 * Interleave a packet per dts in an output media file.
1437
 *
1438
 * Packets with pkt->destruct == av_destruct_packet will be freed inside this
1439
 * function, so they cannot be used after it. Note that calling av_free_packet()
1440
 * on them is still safe.
1441
 *
1442
 * @param s media file handle
1443
 * @param out the interleaved packet will be output here
1444
 * @param pkt the input packet
1445
 * @param flush 1 if no further packets are available as input and all
1446
 *              remaining packets should be output
1447
 * @return 1 if a packet was output, 0 if no packet could be output,
1448
 *         < 0 if an error occurred
1449
 */
1450
int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
1451
                                 AVPacket *pkt, int flush);
1452

    
1453
/**
1454
 * Write the stream trailer to an output media file and free the
1455
 * file private data.
1456
 *
1457
 * May only be called after a successful call to av_write_header.
1458
 *
1459
 * @param s media file handle
1460
 * @return 0 if OK, AVERROR_xxx on error
1461
 */
1462
int av_write_trailer(AVFormatContext *s);
1463

    
1464
#if FF_API_DUMP_FORMAT
1465
attribute_deprecated void dump_format(AVFormatContext *ic,
1466
                                      int index,
1467
                                      const char *url,
1468
                                      int is_output);
1469
#endif
1470

    
1471
void av_dump_format(AVFormatContext *ic,
1472
                    int index,
1473
                    const char *url,
1474
                    int is_output);
1475

    
1476
#if FF_API_PARSE_FRAME_PARAM
1477
/**
1478
 * Parse width and height out of string str.
1479
 * @deprecated Use av_parse_video_frame_size instead.
1480
 */
1481
attribute_deprecated int parse_image_size(int *width_ptr, int *height_ptr,
1482
                                          const char *str);
1483

    
1484
/**
1485
 * Convert framerate from a string to a fraction.
1486
 * @deprecated Use av_parse_video_frame_rate instead.
1487
 */
1488
attribute_deprecated int parse_frame_rate(int *frame_rate, int *frame_rate_base,
1489
                                          const char *arg);
1490
#endif
1491

    
1492
#if FF_API_PARSE_DATE
1493
/**
1494
 * Parse datestr and return a corresponding number of microseconds.
1495
 *
1496
 * @param datestr String representing a date or a duration.
1497
 * See av_parse_time() for the syntax of the provided string.
1498
 * @deprecated in favor of av_parse_time()
1499
 */
1500
attribute_deprecated
1501
int64_t parse_date(const char *datestr, int duration);
1502
#endif
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
#if FF_API_FIND_INFO_TAG
1516
/**
1517
 * @deprecated use av_find_info_tag in libavutil instead.
1518
 */
1519
attribute_deprecated int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
1520
#endif
1521

    
1522
/**
1523
 * Return in 'buf' the path with '%d' replaced by a number.
1524
 *
1525
 * Also handles the '%0nd' format where 'n' is the total number
1526
 * of digits and '%%'.
1527
 *
1528
 * @param buf destination buffer
1529
 * @param buf_size destination buffer size
1530
 * @param path numbered sequence string
1531
 * @param number frame number
1532
 * @return 0 if OK, -1 on format error
1533
 */
1534
int av_get_frame_filename(char *buf, int buf_size,
1535
                          const char *path, int number);
1536

    
1537
/**
1538
 * Check whether filename actually is a numbered sequence generator.
1539
 *
1540
 * @param filename possible numbered sequence string
1541
 * @return 1 if a valid numbered sequence string, 0 otherwise
1542
 */
1543
int av_filename_number_test(const char *filename);
1544

    
1545
/**
1546
 * Generate an SDP for an RTP session.
1547
 *
1548
 * @param ac array of AVFormatContexts describing the RTP streams. If the
1549
 *           array is composed by only one context, such context can contain
1550
 *           multiple AVStreams (one AVStream per RTP stream). Otherwise,
1551
 *           all the contexts in the array (an AVCodecContext per RTP stream)
1552
 *           must contain only one AVStream.
1553
 * @param n_files number of AVCodecContexts contained in ac
1554
 * @param buff buffer where the SDP will be stored (must be allocated by
1555
 *             the caller)
1556
 * @param size the size of the buffer
1557
 * @return 0 if OK, AVERROR_xxx on error
1558
 */
1559
int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size);
1560

    
1561
/**
1562
 * Return a positive value if the given filename has one of the given
1563
 * extensions, 0 otherwise.
1564
 *
1565
 * @param extensions a comma-separated list of filename extensions
1566
 */
1567
int av_match_ext(const char *filename, const char *extensions);
1568

    
1569
#endif /* AVFORMAT_AVFORMAT_H */