1889c6724a
* qatar/master:
AVOptions: fix av_set_string3() doxy to match reality.
cmdutils: get rid of dummy contexts for examining AVOptions.
lavf,lavc,sws: add {avcodec,avformat,sws}_get_class() functions.
AVOptions: add AV_OPT_SEARCH_FAKE_OBJ flag for av_opt_find().
cpu detection: avoid a signed overflow
Conflicts:
avconv.c
cmdutils.c
doc/APIchanges
ffmpeg.c
libavcodec/options.c
libavcodec/version.h
libavformat/version.h
libavutil/avutil.h
Merged-by: Michael Niedermayer <michaelni@gmx.at>
1732 lines
63 KiB
C
1732 lines
63 KiB
C
/*
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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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* Return the LIBAVFORMAT_VERSION_INT constant.
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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 "libavutil/dict.h"
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#include "libavutil/log.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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* @defgroup metadata_api Public Metadata API
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* @{
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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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* - 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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* - 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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* - 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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* - 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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* - 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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* - 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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@verbatim
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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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variant_bitrate -- the total bitrate of the bitrate variant that the current stream is part of
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@endverbatim
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*
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* Look in the examples section for an application example how to use the Metadata API.
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*
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* @}
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*/
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#if FF_API_OLD_METADATA2
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/**
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* @defgroup old_metadata Old metadata API
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* The following functions are deprecated, use
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* their equivalents from libavutil/dict.h instead.
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* @{
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*/
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#define AV_METADATA_MATCH_CASE AV_DICT_MATCH_CASE
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#define AV_METADATA_IGNORE_SUFFIX AV_DICT_IGNORE_SUFFIX
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#define AV_METADATA_DONT_STRDUP_KEY AV_DICT_DONT_STRDUP_KEY
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#define AV_METADATA_DONT_STRDUP_VAL AV_DICT_DONT_STRDUP_VAL
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#define AV_METADATA_DONT_OVERWRITE AV_DICT_DONT_OVERWRITE
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typedef attribute_deprecated AVDictionary AVMetadata;
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typedef attribute_deprecated AVDictionaryEntry AVMetadataTag;
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typedef struct AVMetadataConv AVMetadataConv;
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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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attribute_deprecated AVDictionaryEntry *
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av_metadata_get(AVDictionary *m, const char *key, const AVDictionaryEntry *prev, int flags);
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/**
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* Set the given tag in *pm, overwriting an existing tag.
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*
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* @param pm pointer to a pointer to a metadata struct. If *pm is NULL
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* a metadata struct is allocated and put in *pm.
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* @param key tag key to add to *pm (will be av_strduped depending on flags)
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* @param value tag value to add to *pm (will be av_strduped depending on flags).
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* Passing a NULL value will cause an existing tag to be deleted.
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* @return >= 0 on success otherwise an error code <0
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*/
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attribute_deprecated int av_metadata_set2(AVDictionary **pm, const char *key, const char *value, int flags);
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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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/**
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* Copy metadata from one AVDictionary struct into another.
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* @param dst pointer to a pointer to a AVDictionary 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 AVDictionary 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_DICT_IGNORE_SUFFIX flag
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*/
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attribute_deprecated void av_metadata_copy(AVDictionary **dst, AVDictionary *src, int flags);
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/**
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* Free all the memory allocated for an AVDictionary struct.
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*/
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attribute_deprecated void av_metadata_free(AVDictionary **m);
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/**
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* @}
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*/
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#endif
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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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#if FF_API_FORMAT_PARAMETERS
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attribute_deprecated AVRational time_base;
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attribute_deprecated int sample_rate;
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attribute_deprecated int channels;
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attribute_deprecated int width;
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attribute_deprecated int height;
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attribute_deprecated enum PixelFormat pix_fmt;
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attribute_deprecated int channel; /**< Used to select DV channel. */
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attribute_deprecated const char *standard; /**< deprecated, use demuxer-specific options instead. */
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attribute_deprecated unsigned int mpeg2ts_raw:1; /**< deprecated, use mpegtsraw demuxer */
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/**< deprecated, use mpegtsraw demuxer-specific options instead */
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attribute_deprecated unsigned int mpeg2ts_compute_pcr:1;
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attribute_deprecated unsigned int initial_pause:1; /**< Do not begin to play the stream
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immediately (RTSP only). */
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attribute_deprecated unsigned int prealloced_context:1;
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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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#define AVFMT_NOBINSEARCH 0x2000 /**< Format does not allow to fallback to binary search via read_timestamp */
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#define AVFMT_NOGENSEARCH 0x4000 /**< Format does not allow to fallback to generic search */
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#define AVFMT_TS_NONSTRICT 0x8000 /**< Format does not require strictly
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increasing timestamps, but they must
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still be monotonic */
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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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void *dummy;
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int (*interleave_packet)(struct AVFormatContext *, AVPacket *out,
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AVPacket *in, int flush);
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/**
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* List of supported codec_id-codec_tag pairs, ordered by "better
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* choice first". The arrays are all terminated by CODEC_ID_NONE.
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*/
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const struct AVCodecTag * const *codec_tag;
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enum CodecID subtitle_codec; /**< default subtitle codec */
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#if FF_API_OLD_METADATA2
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const AVMetadataConv *metadata_conv;
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#endif
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const AVClass *priv_class; ///< AVClass for the private context
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/**
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* Test if the given codec can be stored in this container.
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*
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* @return 1 if the codec is supported, 0 if it is not.
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* A negative number if unknown.
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*/
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int (*query_codec)(enum CodecID id, int std_compliance);
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void (*get_output_timestamp)(struct AVFormatContext *s, int stream,
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int64_t *dts, int64_t *wall);
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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_METADATA2
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const AVMetadataConv *metadata_conv;
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#endif
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const AVClass *priv_class; ///< AVClass for the private context
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/* private fields */
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struct 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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};
|
|
|
|
typedef struct AVIndexEntry {
|
|
int64_t pos;
|
|
int64_t timestamp;
|
|
#define AVINDEX_KEYFRAME 0x0001
|
|
int flags:2;
|
|
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).
|
|
int min_distance; /**< Minimum distance between this and the previous keyframe, used to avoid unneeded searching. */
|
|
} AVIndexEntry;
|
|
|
|
#define AV_DISPOSITION_DEFAULT 0x0001
|
|
#define AV_DISPOSITION_DUB 0x0002
|
|
#define AV_DISPOSITION_ORIGINAL 0x0004
|
|
#define AV_DISPOSITION_COMMENT 0x0008
|
|
#define AV_DISPOSITION_LYRICS 0x0010
|
|
#define AV_DISPOSITION_KARAOKE 0x0020
|
|
|
|
/**
|
|
* Track should be used during playback by default.
|
|
* Useful for subtitle track that should be displayed
|
|
* even when user did not explicitly ask for subtitles.
|
|
*/
|
|
#define AV_DISPOSITION_FORCED 0x0040
|
|
#define AV_DISPOSITION_HEARING_IMPAIRED 0x0080 /**< stream for hearing impaired audiences */
|
|
#define AV_DISPOSITION_VISUAL_IMPAIRED 0x0100 /**< stream for visual impaired audiences */
|
|
#define AV_DISPOSITION_CLEAN_EFFECTS 0x0200 /**< stream without voice */
|
|
|
|
/**
|
|
* Stream structure.
|
|
* New fields can be added to the end with minor version bumps.
|
|
* Removal, reordering and changes to existing fields require a major
|
|
* version bump.
|
|
* sizeof(AVStream) must not be used outside libav*.
|
|
*/
|
|
typedef struct AVStream {
|
|
int index; /**< stream index in AVFormatContext */
|
|
int id; /**< format-specific stream ID */
|
|
AVCodecContext *codec; /**< codec context */
|
|
/**
|
|
* Real base framerate of the stream.
|
|
* This is the lowest framerate with which all timestamps can be
|
|
* represented accurately (it is the least common multiple of all
|
|
* framerates in the stream). Note, this value is just a guess!
|
|
* For example, if the time base is 1/90000 and all frames have either
|
|
* approximately 3600 or 1800 timer ticks, then r_frame_rate will be 50/1.
|
|
*/
|
|
AVRational r_frame_rate;
|
|
void *priv_data;
|
|
|
|
/* internal data used in av_find_stream_info() */
|
|
int64_t first_dts;
|
|
|
|
/**
|
|
* encoding: pts generation when outputting stream
|
|
*/
|
|
struct AVFrac pts;
|
|
|
|
/**
|
|
* This is the fundamental unit of time (in seconds) in terms
|
|
* of which frame timestamps are represented. For fixed-fps content,
|
|
* time base should be 1/framerate and timestamp increments should be 1.
|
|
* decoding: set by libavformat
|
|
* encoding: set by libavformat in av_write_header
|
|
*/
|
|
AVRational time_base;
|
|
int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
|
|
/* ffmpeg.c private use */
|
|
int stream_copy; /**< If set, just copy stream. */
|
|
enum AVDiscard discard; ///< Selects which packets can be discarded at will and do not need to be demuxed.
|
|
|
|
#if FF_API_AVSTREAM_QUALITY
|
|
//FIXME move stuff to a flags field?
|
|
/**
|
|
* Quality, as it has been removed from AVCodecContext and put in AVVideoFrame.
|
|
* MN: dunno if that is the right place for it
|
|
*/
|
|
attribute_deprecated float quality;
|
|
#endif
|
|
|
|
/**
|
|
* Decoding: pts of the first frame of the stream, in stream time base.
|
|
* Only set this if you are absolutely 100% sure that the value you set
|
|
* it to really is the pts of the first frame.
|
|
* This may be undefined (AV_NOPTS_VALUE).
|
|
* @note The ASF header does NOT contain a correct start_time the ASF
|
|
* demuxer must NOT set this.
|
|
*/
|
|
int64_t start_time;
|
|
|
|
/**
|
|
* Decoding: duration of the stream, in stream time base.
|
|
* If a source file does not specify a duration, but does specify
|
|
* a bitrate, this value will be estimated from bitrate and file size.
|
|
*/
|
|
int64_t duration;
|
|
|
|
/* av_read_frame() support */
|
|
enum AVStreamParseType need_parsing;
|
|
struct AVCodecParserContext *parser;
|
|
|
|
int64_t cur_dts;
|
|
int last_IP_duration;
|
|
int64_t last_IP_pts;
|
|
/* av_seek_frame() support */
|
|
AVIndexEntry *index_entries; /**< Only used if the format does not
|
|
support seeking natively. */
|
|
int nb_index_entries;
|
|
unsigned int index_entries_allocated_size;
|
|
|
|
int64_t nb_frames; ///< number of frames in this stream if known or 0
|
|
|
|
int disposition; /**< AV_DISPOSITION_* bit field */
|
|
|
|
AVProbeData probe_data;
|
|
#define MAX_REORDER_DELAY 16
|
|
int64_t pts_buffer[MAX_REORDER_DELAY+1];
|
|
|
|
/**
|
|
* sample aspect ratio (0 if unknown)
|
|
* - encoding: Set by user.
|
|
* - decoding: Set by libavformat.
|
|
*/
|
|
AVRational sample_aspect_ratio;
|
|
|
|
AVDictionary *metadata;
|
|
|
|
/* Intended mostly for av_read_frame() support. Not supposed to be used by */
|
|
/* external applications; try to use something else if at all possible. */
|
|
const uint8_t *cur_ptr;
|
|
int cur_len;
|
|
AVPacket cur_pkt;
|
|
|
|
// Timestamp generation support:
|
|
/**
|
|
* Timestamp corresponding to the last dts sync point.
|
|
*
|
|
* Initialized when AVCodecParserContext.dts_sync_point >= 0 and
|
|
* a DTS is received from the underlying container. Otherwise set to
|
|
* AV_NOPTS_VALUE by default.
|
|
*/
|
|
int64_t reference_dts;
|
|
|
|
/**
|
|
* Number of packets to buffer for codec probing
|
|
* NOT PART OF PUBLIC API
|
|
*/
|
|
#define MAX_PROBE_PACKETS 2500
|
|
int probe_packets;
|
|
|
|
/**
|
|
* last packet in packet_buffer for this stream when muxing.
|
|
* used internally, NOT PART OF PUBLIC API, dont read or write from outside of libav*
|
|
*/
|
|
struct AVPacketList *last_in_packet_buffer;
|
|
|
|
/**
|
|
* Average framerate
|
|
*/
|
|
AVRational avg_frame_rate;
|
|
|
|
/**
|
|
* Number of frames that have been demuxed during av_find_stream_info()
|
|
*/
|
|
int codec_info_nb_frames;
|
|
|
|
/**
|
|
* Stream Identifier
|
|
* This is the MPEG-TS stream identifier +1
|
|
* 0 means unknown
|
|
*/
|
|
int stream_identifier;
|
|
|
|
/**
|
|
* Stream informations used internally by av_find_stream_info()
|
|
*/
|
|
#define MAX_STD_TIMEBASES (60*12+5)
|
|
struct {
|
|
int64_t last_dts;
|
|
int64_t duration_gcd;
|
|
int duration_count;
|
|
double duration_error[MAX_STD_TIMEBASES];
|
|
int64_t codec_info_duration;
|
|
} *info;
|
|
|
|
/**
|
|
* flag to indicate that probing is requested
|
|
* NOT PART OF PUBLIC API
|
|
*/
|
|
int request_probe;
|
|
} AVStream;
|
|
|
|
#define AV_PROGRAM_RUNNING 1
|
|
|
|
/**
|
|
* New fields can be added to the end with minor version bumps.
|
|
* Removal, reordering and changes to existing fields require a major
|
|
* version bump.
|
|
* sizeof(AVProgram) must not be used outside libav*.
|
|
*/
|
|
typedef struct AVProgram {
|
|
int id;
|
|
int flags;
|
|
enum AVDiscard discard; ///< selects which program to discard and which to feed to the caller
|
|
unsigned int *stream_index;
|
|
unsigned int nb_stream_indexes;
|
|
AVDictionary *metadata;
|
|
|
|
int program_num;
|
|
int pmt_pid;
|
|
int pcr_pid;
|
|
} AVProgram;
|
|
|
|
#define AVFMTCTX_NOHEADER 0x0001 /**< signal that no header is present
|
|
(streams are added dynamically) */
|
|
|
|
typedef struct AVChapter {
|
|
int id; ///< unique ID to identify the chapter
|
|
AVRational time_base; ///< time base in which the start/end timestamps are specified
|
|
int64_t start, end; ///< chapter start/end time in time_base units
|
|
AVDictionary *metadata;
|
|
} AVChapter;
|
|
|
|
/**
|
|
* Format I/O context.
|
|
* New fields can be added to the end with minor version bumps.
|
|
* Removal, reordering and changes to existing fields require a major
|
|
* version bump.
|
|
* sizeof(AVFormatContext) must not be used outside libav*.
|
|
*/
|
|
typedef struct AVFormatContext {
|
|
const AVClass *av_class; /**< Set by avformat_alloc_context. */
|
|
/* Can only be iformat or oformat, not both at the same time. */
|
|
struct AVInputFormat *iformat;
|
|
struct AVOutputFormat *oformat;
|
|
void *priv_data;
|
|
AVIOContext *pb;
|
|
unsigned int nb_streams;
|
|
AVStream **streams;
|
|
char filename[1024]; /**< input or output filename */
|
|
/* stream info */
|
|
#if FF_API_TIMESTAMP
|
|
/**
|
|
* @deprecated use 'creation_time' metadata tag instead
|
|
*/
|
|
attribute_deprecated int64_t timestamp;
|
|
#endif
|
|
|
|
int ctx_flags; /**< Format-specific flags, see AVFMTCTX_xx */
|
|
/* private data for pts handling (do not modify directly). */
|
|
/**
|
|
* This buffer is only needed when packets were already buffered but
|
|
* not decoded, for example to get the codec parameters in MPEG
|
|
* streams.
|
|
*/
|
|
struct AVPacketList *packet_buffer;
|
|
|
|
/**
|
|
* Decoding: position of the first frame of the component, in
|
|
* AV_TIME_BASE fractional seconds. NEVER set this value directly:
|
|
* It is deduced from the AVStream values.
|
|
*/
|
|
int64_t start_time;
|
|
|
|
/**
|
|
* Decoding: duration of the stream, in AV_TIME_BASE fractional
|
|
* seconds. Only set this value if you know none of the individual stream
|
|
* durations and also dont set any of them. This is deduced from the
|
|
* AVStream values if not set.
|
|
*/
|
|
int64_t duration;
|
|
|
|
/**
|
|
* decoding: total file size, 0 if unknown
|
|
*/
|
|
int64_t file_size;
|
|
|
|
/**
|
|
* Decoding: total stream bitrate in bit/s, 0 if not
|
|
* available. Never set it directly if the file_size and the
|
|
* duration are known as FFmpeg can compute it automatically.
|
|
*/
|
|
int bit_rate;
|
|
|
|
/* av_read_frame() support */
|
|
AVStream *cur_st;
|
|
|
|
/* av_seek_frame() support */
|
|
int64_t data_offset; /**< offset of the first packet */
|
|
|
|
int mux_rate;
|
|
unsigned int packet_size;
|
|
int preload;
|
|
int max_delay;
|
|
|
|
#if FF_API_LOOP_OUTPUT
|
|
#define AVFMT_NOOUTPUTLOOP -1
|
|
#define AVFMT_INFINITEOUTPUTLOOP 0
|
|
/**
|
|
* number of times to loop output in formats that support it
|
|
*
|
|
* @deprecated use the 'loop' private option in the gif muxer.
|
|
*/
|
|
attribute_deprecated int loop_output;
|
|
#endif
|
|
|
|
int flags;
|
|
#define AVFMT_FLAG_GENPTS 0x0001 ///< Generate missing pts even if it requires parsing future frames.
|
|
#define AVFMT_FLAG_IGNIDX 0x0002 ///< Ignore index.
|
|
#define AVFMT_FLAG_NONBLOCK 0x0004 ///< Do not block when reading packets from input.
|
|
#define AVFMT_FLAG_IGNDTS 0x0008 ///< Ignore DTS on frames that contain both DTS & PTS
|
|
#define AVFMT_FLAG_NOFILLIN 0x0010 ///< Do not infer any values from other values, just return what is stored in the container
|
|
#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
|
|
#if FF_API_FLAG_RTP_HINT
|
|
#define AVFMT_FLAG_RTP_HINT 0x0040 ///< Deprecated, use the -movflags rtphint muxer specific AVOption instead
|
|
#endif
|
|
#define AVFMT_FLAG_CUSTOM_IO 0x0080 ///< The caller has supplied a custom AVIOContext, don't avio_close() it.
|
|
#define AVFMT_FLAG_DISCARD_CORRUPT 0x0100 ///< Discard frames marked corrupted
|
|
#define AVFMT_FLAG_MP4A_LATM 0x8000 ///< Enable RTP MP4A-LATM payload
|
|
#define AVFMT_FLAG_SORT_DTS 0x10000 ///< try to interleave outputted packets by dts (using this flag can slow demuxing down)
|
|
#define AVFMT_FLAG_PRIV_OPT 0x20000 ///< Enable use of private options by delaying codec open (this could be made default once all code is converted)
|
|
#define AVFMT_FLAG_KEEP_SIDE_DATA 0x40000 ///< Dont merge side data but keep it seperate.
|
|
|
|
#if FF_API_LOOP_INPUT
|
|
/**
|
|
* @deprecated, use the 'loop' img2 demuxer private option.
|
|
*/
|
|
attribute_deprecated int loop_input;
|
|
#endif
|
|
|
|
/**
|
|
* decoding: size of data to probe; encoding: unused.
|
|
*/
|
|
unsigned int probesize;
|
|
|
|
/**
|
|
* Maximum time (in AV_TIME_BASE units) during which the input should
|
|
* be analyzed in av_find_stream_info().
|
|
*/
|
|
int max_analyze_duration;
|
|
|
|
const uint8_t *key;
|
|
int keylen;
|
|
|
|
unsigned int nb_programs;
|
|
AVProgram **programs;
|
|
|
|
/**
|
|
* Forced video codec_id.
|
|
* Demuxing: Set by user.
|
|
*/
|
|
enum CodecID video_codec_id;
|
|
|
|
/**
|
|
* Forced audio codec_id.
|
|
* Demuxing: Set by user.
|
|
*/
|
|
enum CodecID audio_codec_id;
|
|
|
|
/**
|
|
* Forced subtitle codec_id.
|
|
* Demuxing: Set by user.
|
|
*/
|
|
enum CodecID subtitle_codec_id;
|
|
|
|
/**
|
|
* Maximum amount of memory in bytes to use for the index of each stream.
|
|
* If the index exceeds this size, entries will be discarded as
|
|
* needed to maintain a smaller size. This can lead to slower or less
|
|
* accurate seeking (depends on demuxer).
|
|
* Demuxers for which a full in-memory index is mandatory will ignore
|
|
* this.
|
|
* muxing : unused
|
|
* demuxing: set by user
|
|
*/
|
|
unsigned int max_index_size;
|
|
|
|
/**
|
|
* Maximum amount of memory in bytes to use for buffering frames
|
|
* obtained from realtime capture devices.
|
|
*/
|
|
unsigned int max_picture_buffer;
|
|
|
|
unsigned int nb_chapters;
|
|
AVChapter **chapters;
|
|
|
|
/**
|
|
* Flags to enable debugging.
|
|
*/
|
|
int debug;
|
|
#define FF_FDEBUG_TS 0x0001
|
|
|
|
/**
|
|
* Raw packets from the demuxer, prior to parsing and decoding.
|
|
* This buffer is used for buffering packets until the codec can
|
|
* be identified, as parsing cannot be done without knowing the
|
|
* codec.
|
|
*/
|
|
struct AVPacketList *raw_packet_buffer;
|
|
struct AVPacketList *raw_packet_buffer_end;
|
|
|
|
struct AVPacketList *packet_buffer_end;
|
|
|
|
AVDictionary *metadata;
|
|
|
|
/**
|
|
* Remaining size available for raw_packet_buffer, in bytes.
|
|
* NOT PART OF PUBLIC API
|
|
*/
|
|
#define RAW_PACKET_BUFFER_SIZE 2500000
|
|
int raw_packet_buffer_remaining_size;
|
|
|
|
/**
|
|
* Start time of the stream in real world time, in microseconds
|
|
* since the unix epoch (00:00 1st January 1970). That is, pts=0
|
|
* in the stream was captured at this real world time.
|
|
* - encoding: Set by user.
|
|
* - decoding: Unused.
|
|
*/
|
|
int64_t start_time_realtime;
|
|
|
|
/**
|
|
* decoding: number of frames used to probe fps
|
|
*/
|
|
int fps_probe_size;
|
|
|
|
/**
|
|
* Error recognition; higher values will detect more errors but may
|
|
* misdetect some more or less valid parts as errors.
|
|
* - encoding: unused
|
|
* - decoding: Set by user.
|
|
*/
|
|
int error_recognition;
|
|
|
|
/**
|
|
* Transport stream id.
|
|
* This will be moved into demuxer private options. Thus no API/ABI compatibility
|
|
*/
|
|
int ts_id;
|
|
} AVFormatContext;
|
|
|
|
typedef struct AVPacketList {
|
|
AVPacket pkt;
|
|
struct AVPacketList *next;
|
|
} AVPacketList;
|
|
|
|
/**
|
|
* If f is NULL, returns the first registered input format,
|
|
* if f is non-NULL, returns the next registered input format after f
|
|
* or NULL if f is the last one.
|
|
*/
|
|
AVInputFormat *av_iformat_next(AVInputFormat *f);
|
|
|
|
/**
|
|
* If f is NULL, returns the first registered output format,
|
|
* if f is non-NULL, returns the next registered output format after f
|
|
* or NULL if f is the last one.
|
|
*/
|
|
AVOutputFormat *av_oformat_next(AVOutputFormat *f);
|
|
|
|
#if FF_API_GUESS_IMG2_CODEC
|
|
attribute_deprecated enum CodecID av_guess_image2_codec(const char *filename);
|
|
#endif
|
|
|
|
/* XXX: Use automatic init with either ELF sections or C file parser */
|
|
/* modules. */
|
|
|
|
/* utils.c */
|
|
void av_register_input_format(AVInputFormat *format);
|
|
void av_register_output_format(AVOutputFormat *format);
|
|
|
|
/**
|
|
* Return the output format in the list of registered output formats
|
|
* which best matches the provided parameters, or return NULL if
|
|
* there is no match.
|
|
*
|
|
* @param short_name if non-NULL checks if short_name matches with the
|
|
* names of the registered formats
|
|
* @param filename if non-NULL checks if filename terminates with the
|
|
* extensions of the registered formats
|
|
* @param mime_type if non-NULL checks if mime_type matches with the
|
|
* MIME type of the registered formats
|
|
*/
|
|
AVOutputFormat *av_guess_format(const char *short_name,
|
|
const char *filename,
|
|
const char *mime_type);
|
|
|
|
/**
|
|
* Guess the codec ID based upon muxer and filename.
|
|
*/
|
|
enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
|
|
const char *filename, const char *mime_type,
|
|
enum AVMediaType type);
|
|
|
|
/**
|
|
* Send a nice hexadecimal dump of a buffer to the specified file stream.
|
|
*
|
|
* @param f The file stream pointer where the dump should be sent to.
|
|
* @param buf buffer
|
|
* @param size buffer size
|
|
*
|
|
* @see av_hex_dump_log, av_pkt_dump2, av_pkt_dump_log2
|
|
*/
|
|
void av_hex_dump(FILE *f, uint8_t *buf, int size);
|
|
|
|
/**
|
|
* Send a nice hexadecimal dump of a buffer to the log.
|
|
*
|
|
* @param avcl A pointer to an arbitrary struct of which the first field is a
|
|
* pointer to an AVClass struct.
|
|
* @param level The importance level of the message, lower values signifying
|
|
* higher importance.
|
|
* @param buf buffer
|
|
* @param size buffer size
|
|
*
|
|
* @see av_hex_dump, av_pkt_dump2, av_pkt_dump_log2
|
|
*/
|
|
void av_hex_dump_log(void *avcl, int level, uint8_t *buf, int size);
|
|
|
|
/**
|
|
* Send a nice dump of a packet to the specified file stream.
|
|
*
|
|
* @param f The file stream pointer where the dump should be sent to.
|
|
* @param pkt packet to dump
|
|
* @param dump_payload True if the payload must be displayed, too.
|
|
* @param st AVStream that the packet belongs to
|
|
*/
|
|
void av_pkt_dump2(FILE *f, AVPacket *pkt, int dump_payload, AVStream *st);
|
|
|
|
|
|
/**
|
|
* Send a nice dump of a packet to the log.
|
|
*
|
|
* @param avcl A pointer to an arbitrary struct of which the first field is a
|
|
* pointer to an AVClass struct.
|
|
* @param level The importance level of the message, lower values signifying
|
|
* higher importance.
|
|
* @param pkt packet to dump
|
|
* @param dump_payload True if the payload must be displayed, too.
|
|
* @param st AVStream that the packet belongs to
|
|
*/
|
|
void av_pkt_dump_log2(void *avcl, int level, AVPacket *pkt, int dump_payload,
|
|
AVStream *st);
|
|
|
|
#if FF_API_PKT_DUMP
|
|
attribute_deprecated void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
|
|
attribute_deprecated void av_pkt_dump_log(void *avcl, int level, AVPacket *pkt,
|
|
int dump_payload);
|
|
#endif
|
|
|
|
/**
|
|
* Initialize libavformat and register all the muxers, demuxers and
|
|
* protocols. If you do not call this function, then you can select
|
|
* exactly which formats you want to support.
|
|
*
|
|
* @see av_register_input_format()
|
|
* @see av_register_output_format()
|
|
* @see av_register_protocol()
|
|
*/
|
|
void av_register_all(void);
|
|
|
|
/**
|
|
* Get the CodecID for the given codec tag tag.
|
|
* If no codec id is found returns CODEC_ID_NONE.
|
|
*
|
|
* @param tags list of supported codec_id-codec_tag pairs, as stored
|
|
* in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
|
|
*/
|
|
enum CodecID av_codec_get_id(const struct AVCodecTag * const *tags, unsigned int tag);
|
|
|
|
/**
|
|
* Get the codec tag for the given codec id id.
|
|
* If no codec tag is found returns 0.
|
|
*
|
|
* @param tags list of supported codec_id-codec_tag pairs, as stored
|
|
* in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
|
|
*/
|
|
unsigned int av_codec_get_tag(const struct AVCodecTag * const *tags, enum CodecID id);
|
|
|
|
/* media file input */
|
|
|
|
/**
|
|
* Find AVInputFormat based on the short name of the input format.
|
|
*/
|
|
AVInputFormat *av_find_input_format(const char *short_name);
|
|
|
|
/**
|
|
* Guess the file format.
|
|
*
|
|
* @param is_opened Whether the file is already opened; determines whether
|
|
* demuxers with or without AVFMT_NOFILE are probed.
|
|
*/
|
|
AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
|
|
|
|
/**
|
|
* Guess the file format.
|
|
*
|
|
* @param is_opened Whether the file is already opened; determines whether
|
|
* demuxers with or without AVFMT_NOFILE are probed.
|
|
* @param score_max A probe score larger that this is required to accept a
|
|
* detection, the variable is set to the actual detection
|
|
* score afterwards.
|
|
* If the score is <= AVPROBE_SCORE_MAX / 4 it is recommended
|
|
* to retry with a larger probe buffer.
|
|
*/
|
|
AVInputFormat *av_probe_input_format2(AVProbeData *pd, int is_opened, int *score_max);
|
|
|
|
/**
|
|
* Guess the file format.
|
|
*
|
|
* @param is_opened Whether the file is already opened; determines whether
|
|
* demuxers with or without AVFMT_NOFILE are probed.
|
|
* @param score_ret The score of the best detection.
|
|
*/
|
|
AVInputFormat *av_probe_input_format3(AVProbeData *pd, int is_opened, int *score_ret);
|
|
|
|
/**
|
|
* Probe a bytestream to determine the input format. Each time a probe returns
|
|
* with a score that is too low, the probe buffer size is increased and another
|
|
* attempt is made. When the maximum probe size is reached, the input format
|
|
* with the highest score is returned.
|
|
*
|
|
* @param pb the bytestream to probe
|
|
* @param fmt the input format is put here
|
|
* @param filename the filename of the stream
|
|
* @param logctx the log context
|
|
* @param offset the offset within the bytestream to probe from
|
|
* @param max_probe_size the maximum probe buffer size (zero for default)
|
|
* @return 0 in case of success, a negative value corresponding to an
|
|
* AVERROR code otherwise
|
|
*/
|
|
int av_probe_input_buffer(AVIOContext *pb, AVInputFormat **fmt,
|
|
const char *filename, void *logctx,
|
|
unsigned int offset, unsigned int max_probe_size);
|
|
|
|
#if FF_API_FORMAT_PARAMETERS
|
|
/**
|
|
* Allocate all the structures needed to read an input stream.
|
|
* This does not open the needed codecs for decoding the stream[s].
|
|
* @deprecated use avformat_open_input instead.
|
|
*/
|
|
attribute_deprecated int av_open_input_stream(AVFormatContext **ic_ptr,
|
|
AVIOContext *pb, const char *filename,
|
|
AVInputFormat *fmt, AVFormatParameters *ap);
|
|
|
|
/**
|
|
* Open a media file as input. The codecs are not opened. Only the file
|
|
* header (if present) is read.
|
|
*
|
|
* @param ic_ptr The opened media file handle is put here.
|
|
* @param filename filename to open
|
|
* @param fmt If non-NULL, force the file format to use.
|
|
* @param buf_size optional buffer size (zero if default is OK)
|
|
* @param ap Additional parameters needed when opening the file
|
|
* (NULL if default).
|
|
* @return 0 if OK, AVERROR_xxx otherwise
|
|
*
|
|
* @deprecated use avformat_open_input instead.
|
|
*/
|
|
attribute_deprecated int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
|
|
AVInputFormat *fmt,
|
|
int buf_size,
|
|
AVFormatParameters *ap);
|
|
#endif
|
|
|
|
/**
|
|
* Open an input stream and read the header. The codecs are not opened.
|
|
* The stream must be closed with av_close_input_file().
|
|
*
|
|
* @param ps Pointer to user-supplied AVFormatContext (allocated by avformat_alloc_context).
|
|
* May be a pointer to NULL, in which case an AVFormatContext is allocated by this
|
|
* function and written into ps.
|
|
* Note that a user-supplied AVFormatContext will be freed on failure.
|
|
* @param filename Name of the stream to open.
|
|
* @param fmt If non-NULL, this parameter forces a specific input format.
|
|
* Otherwise the format is autodetected.
|
|
* @param options A dictionary filled with AVFormatContext and demuxer-private options.
|
|
* On return this parameter will be destroyed and replaced with a dict containing
|
|
* options that were not found. May be NULL.
|
|
*
|
|
* @return 0 on success, a negative AVERROR on failure.
|
|
*
|
|
* @note If you want to use custom IO, preallocate the format context and set its pb field.
|
|
*/
|
|
int avformat_open_input(AVFormatContext **ps, const char *filename, AVInputFormat *fmt, AVDictionary **options);
|
|
|
|
int av_demuxer_open(AVFormatContext *ic, AVFormatParameters *ap);
|
|
|
|
/**
|
|
* Allocate an AVFormatContext.
|
|
* avformat_free_context() can be used to free the context and everything
|
|
* allocated by the framework within it.
|
|
*/
|
|
AVFormatContext *avformat_alloc_context(void);
|
|
|
|
#if FF_API_ALLOC_OUTPUT_CONTEXT
|
|
/**
|
|
* @deprecated deprecated in favor of avformat_alloc_output_context2()
|
|
*/
|
|
attribute_deprecated
|
|
AVFormatContext *avformat_alloc_output_context(const char *format,
|
|
AVOutputFormat *oformat,
|
|
const char *filename);
|
|
#endif
|
|
|
|
/**
|
|
* Allocate an AVFormatContext for an output format.
|
|
* avformat_free_context() can be used to free the context and
|
|
* everything allocated by the framework within it.
|
|
*
|
|
* @param *ctx is set to the created format context, or to NULL in
|
|
* case of failure
|
|
* @param oformat format to use for allocating the context, if NULL
|
|
* format_name and filename are used instead
|
|
* @param format_name the name of output format to use for allocating the
|
|
* context, if NULL filename is used instead
|
|
* @param filename the name of the filename to use for allocating the
|
|
* context, may be NULL
|
|
* @return >= 0 in case of success, a negative AVERROR code in case of
|
|
* failure
|
|
*/
|
|
int avformat_alloc_output_context2(AVFormatContext **ctx, AVOutputFormat *oformat,
|
|
const char *format_name, const char *filename);
|
|
|
|
#if FF_API_FORMAT_PARAMETERS
|
|
/**
|
|
* Read packets of a media file to get stream information. This
|
|
* is useful for file formats with no headers such as MPEG. This
|
|
* function also computes the real framerate in case of MPEG-2 repeat
|
|
* frame mode.
|
|
* The logical file position is not changed by this function;
|
|
* examined packets may be buffered for later processing.
|
|
*
|
|
* @param ic media file handle
|
|
* @return >=0 if OK, AVERROR_xxx on error
|
|
* @todo Let the user decide somehow what information is needed so that
|
|
* we do not waste time getting stuff the user does not need.
|
|
*
|
|
* @deprecated use avformat_find_stream_info.
|
|
*/
|
|
attribute_deprecated
|
|
int av_find_stream_info(AVFormatContext *ic);
|
|
#endif
|
|
|
|
/**
|
|
* Read packets of a media file to get stream information. This
|
|
* is useful for file formats with no headers such as MPEG. This
|
|
* function also computes the real framerate in case of MPEG-2 repeat
|
|
* frame mode.
|
|
* The logical file position is not changed by this function;
|
|
* examined packets may be buffered for later processing.
|
|
*
|
|
* @param ic media file handle
|
|
* @param options If non-NULL, an ic.nb_streams long array of pointers to
|
|
* dictionaries, where i-th member contains options for
|
|
* codec corresponding to i-th stream.
|
|
* On return each dictionary will be filled with options that were not found.
|
|
* @return >=0 if OK, AVERROR_xxx on error
|
|
*
|
|
* @note this function isn't guaranteed to open all the codecs, so
|
|
* options being non-empty at return is a perfectly normal behavior.
|
|
*
|
|
* @todo Let the user decide somehow what information is needed so that
|
|
* we do not waste time getting stuff the user does not need.
|
|
*/
|
|
int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options);
|
|
|
|
/**
|
|
* Find the programs which belong to a given stream.
|
|
*
|
|
* @param ic media file handle
|
|
* @param last the last found program, the search will start after this
|
|
* program, or from the beginning if it is NULL
|
|
* @param s stream index
|
|
* @return the next program which belongs to s, NULL if no program is found or
|
|
* the last program is not among the programs of ic.
|
|
*/
|
|
AVProgram *av_find_program_from_stream(AVFormatContext *ic, AVProgram *last, int s);
|
|
|
|
/**
|
|
* Find the "best" stream in the file.
|
|
* The best stream is determined according to various heuristics as the most
|
|
* likely to be what the user expects.
|
|
* If the decoder parameter is non-NULL, av_find_best_stream will find the
|
|
* default decoder for the stream's codec; streams for which no decoder can
|
|
* be found are ignored.
|
|
*
|
|
* @param ic media file handle
|
|
* @param type stream type: video, audio, subtitles, etc.
|
|
* @param wanted_stream_nb user-requested stream number,
|
|
* or -1 for automatic selection
|
|
* @param related_stream try to find a stream related (eg. in the same
|
|
* program) to this one, or -1 if none
|
|
* @param decoder_ret if non-NULL, returns the decoder for the
|
|
* selected stream
|
|
* @param flags flags; none are currently defined
|
|
* @return the non-negative stream number in case of success,
|
|
* AVERROR_STREAM_NOT_FOUND if no stream with the requested type
|
|
* could be found,
|
|
* AVERROR_DECODER_NOT_FOUND if streams were found but no decoder
|
|
* @note If av_find_best_stream returns successfully and decoder_ret is not
|
|
* NULL, then *decoder_ret is guaranteed to be set to a valid AVCodec.
|
|
*/
|
|
int av_find_best_stream(AVFormatContext *ic,
|
|
enum AVMediaType type,
|
|
int wanted_stream_nb,
|
|
int related_stream,
|
|
AVCodec **decoder_ret,
|
|
int flags);
|
|
|
|
/**
|
|
* Read a transport packet from a media file.
|
|
*
|
|
* This function is obsolete and should never be used.
|
|
* Use av_read_frame() instead.
|
|
*
|
|
* @param s media file handle
|
|
* @param pkt is filled
|
|
* @return 0 if OK, AVERROR_xxx on error
|
|
*/
|
|
int av_read_packet(AVFormatContext *s, AVPacket *pkt);
|
|
|
|
/**
|
|
* Return the next frame of a stream.
|
|
* This function returns what is stored in the file, and does not validate
|
|
* that what is there are valid frames for the decoder. It will split what is
|
|
* stored in the file into frames and return one for each call. It will not
|
|
* omit invalid data between valid frames so as to give the decoder the maximum
|
|
* information possible for decoding.
|
|
*
|
|
* The returned packet is valid
|
|
* until the next av_read_frame() or until av_close_input_file() and
|
|
* must be freed with av_free_packet. For video, the packet contains
|
|
* exactly one frame. For audio, it contains an integer number of
|
|
* frames if each frame has a known fixed size (e.g. PCM or ADPCM
|
|
* data). If the audio frames have a variable size (e.g. MPEG audio),
|
|
* then it contains one frame.
|
|
*
|
|
* pkt->pts, pkt->dts and pkt->duration are always set to correct
|
|
* values in AVStream.time_base units (and guessed if the format cannot
|
|
* provide them). pkt->pts can be AV_NOPTS_VALUE if the video format
|
|
* has B-frames, so it is better to rely on pkt->dts if you do not
|
|
* decompress the payload.
|
|
*
|
|
* @return 0 if OK, < 0 on error or end of file
|
|
*/
|
|
int av_read_frame(AVFormatContext *s, AVPacket *pkt);
|
|
|
|
/**
|
|
* Seek to the keyframe at timestamp.
|
|
* 'timestamp' in 'stream_index'.
|
|
* @param stream_index If stream_index is (-1), a default
|
|
* stream is selected, and timestamp is automatically converted
|
|
* from AV_TIME_BASE units to the stream specific time_base.
|
|
* @param timestamp Timestamp in AVStream.time_base units
|
|
* or, if no stream is specified, in AV_TIME_BASE units.
|
|
* @param flags flags which select direction and seeking mode
|
|
* @return >= 0 on success
|
|
*/
|
|
int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp,
|
|
int flags);
|
|
|
|
/**
|
|
* Seek to timestamp ts.
|
|
* Seeking will be done so that the point from which all active streams
|
|
* can be presented successfully will be closest to ts and within min/max_ts.
|
|
* Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
|
|
*
|
|
* If flags contain AVSEEK_FLAG_BYTE, then all timestamps are in bytes and
|
|
* are the file position (this may not be supported by all demuxers).
|
|
* If flags contain AVSEEK_FLAG_FRAME, then all timestamps are in frames
|
|
* in the stream with stream_index (this may not be supported by all demuxers).
|
|
* Otherwise all timestamps are in units of the stream selected by stream_index
|
|
* or if stream_index is -1, in AV_TIME_BASE units.
|
|
* If flags contain AVSEEK_FLAG_ANY, then non-keyframes are treated as
|
|
* keyframes (this may not be supported by all demuxers).
|
|
*
|
|
* @param stream_index index of the stream which is used as time base reference
|
|
* @param min_ts smallest acceptable timestamp
|
|
* @param ts target timestamp
|
|
* @param max_ts largest acceptable timestamp
|
|
* @param flags flags
|
|
* @return >=0 on success, error code otherwise
|
|
*
|
|
* @note This is part of the new seek API which is still under construction.
|
|
* Thus do not use this yet. It may change at any time, do not expect
|
|
* ABI compatibility yet!
|
|
*/
|
|
int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
|
|
|
|
/**
|
|
* Start playing a network-based stream (e.g. RTSP stream) at the
|
|
* current position.
|
|
*/
|
|
int av_read_play(AVFormatContext *s);
|
|
|
|
/**
|
|
* Pause a network-based stream (e.g. RTSP stream).
|
|
*
|
|
* Use av_read_play() to resume it.
|
|
*/
|
|
int av_read_pause(AVFormatContext *s);
|
|
|
|
/**
|
|
* Free a AVFormatContext allocated by av_open_input_stream.
|
|
* @param s context to free
|
|
*/
|
|
void av_close_input_stream(AVFormatContext *s);
|
|
|
|
/**
|
|
* Close a media file (but not its codecs).
|
|
*
|
|
* @param s media file handle
|
|
*/
|
|
void av_close_input_file(AVFormatContext *s);
|
|
|
|
/**
|
|
* Free an AVFormatContext and all its streams.
|
|
* @param s context to free
|
|
*/
|
|
void avformat_free_context(AVFormatContext *s);
|
|
|
|
/**
|
|
* Add a new stream to a media file.
|
|
*
|
|
* Can only be called in the read_header() function. If the flag
|
|
* AVFMTCTX_NOHEADER is in the format context, then new streams
|
|
* can be added in read_packet too.
|
|
*
|
|
* @param s media file handle
|
|
* @param id file-format-dependent stream ID
|
|
*/
|
|
AVStream *av_new_stream(AVFormatContext *s, int id);
|
|
AVProgram *av_new_program(AVFormatContext *s, int id);
|
|
|
|
/**
|
|
* Set the pts for a given stream. If the new values would be invalid
|
|
* (<= 0), it leaves the AVStream unchanged.
|
|
*
|
|
* @param s stream
|
|
* @param pts_wrap_bits number of bits effectively used by the pts
|
|
* (used for wrap control, 33 is the value for MPEG)
|
|
* @param pts_num numerator to convert to seconds (MPEG: 1)
|
|
* @param pts_den denominator to convert to seconds (MPEG: 90000)
|
|
*/
|
|
void av_set_pts_info(AVStream *s, int pts_wrap_bits,
|
|
unsigned int pts_num, unsigned int pts_den);
|
|
|
|
#define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
|
|
#define AVSEEK_FLAG_BYTE 2 ///< seeking based on position in bytes
|
|
#define AVSEEK_FLAG_ANY 4 ///< seek to any frame, even non-keyframes
|
|
#define AVSEEK_FLAG_FRAME 8 ///< seeking based on frame number
|
|
|
|
int av_find_default_stream_index(AVFormatContext *s);
|
|
|
|
/**
|
|
* Get the index for a specific timestamp.
|
|
* @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond
|
|
* to the timestamp which is <= the requested one, if backward
|
|
* is 0, then it will be >=
|
|
* if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
|
|
* @return < 0 if no such timestamp could be found
|
|
*/
|
|
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
|
|
|
|
/**
|
|
* Add an index entry into a sorted list. Update the entry if the list
|
|
* already contains it.
|
|
*
|
|
* @param timestamp timestamp in the time base of the given stream
|
|
*/
|
|
int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp,
|
|
int size, int distance, int flags);
|
|
|
|
/**
|
|
* Perform a binary search using av_index_search_timestamp() and
|
|
* AVInputFormat.read_timestamp().
|
|
* This is not supposed to be called directly by a user application,
|
|
* but by demuxers.
|
|
* @param target_ts target timestamp in the time base of the given stream
|
|
* @param stream_index stream number
|
|
*/
|
|
int av_seek_frame_binary(AVFormatContext *s, int stream_index,
|
|
int64_t target_ts, int flags);
|
|
|
|
/**
|
|
* Update cur_dts of all streams based on the given timestamp and AVStream.
|
|
*
|
|
* Stream ref_st unchanged, others set cur_dts in their native time base.
|
|
* Only needed for timestamp wrapping or if (dts not set and pts!=dts).
|
|
* @param timestamp new dts expressed in time_base of param ref_st
|
|
* @param ref_st reference stream giving time_base of param timestamp
|
|
*/
|
|
void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
|
|
|
|
/**
|
|
* Perform a binary search using read_timestamp().
|
|
* This is not supposed to be called directly by a user application,
|
|
* but by demuxers.
|
|
* @param target_ts target timestamp in the time base of the given stream
|
|
* @param stream_index stream number
|
|
*/
|
|
int64_t av_gen_search(AVFormatContext *s, int stream_index,
|
|
int64_t target_ts, int64_t pos_min,
|
|
int64_t pos_max, int64_t pos_limit,
|
|
int64_t ts_min, int64_t ts_max,
|
|
int flags, int64_t *ts_ret,
|
|
int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
|
|
|
|
/**
|
|
* media file output
|
|
*/
|
|
#if FF_API_FORMAT_PARAMETERS
|
|
/**
|
|
* @deprecated pass the options to avformat_write_header directly.
|
|
*/
|
|
attribute_deprecated int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
|
|
#endif
|
|
|
|
/**
|
|
* Split a URL string into components.
|
|
*
|
|
* The pointers to buffers for storing individual components may be null,
|
|
* in order to ignore that component. Buffers for components not found are
|
|
* set to empty strings. If the port is not found, it is set to a negative
|
|
* value.
|
|
*
|
|
* @param proto the buffer for the protocol
|
|
* @param proto_size the size of the proto buffer
|
|
* @param authorization the buffer for the authorization
|
|
* @param authorization_size the size of the authorization buffer
|
|
* @param hostname the buffer for the host name
|
|
* @param hostname_size the size of the hostname buffer
|
|
* @param port_ptr a pointer to store the port number in
|
|
* @param path the buffer for the path
|
|
* @param path_size the size of the path buffer
|
|
* @param url the URL to split
|
|
*/
|
|
void av_url_split(char *proto, int proto_size,
|
|
char *authorization, int authorization_size,
|
|
char *hostname, int hostname_size,
|
|
int *port_ptr,
|
|
char *path, int path_size,
|
|
const char *url);
|
|
|
|
/**
|
|
* Allocate the stream private data and write the stream header to
|
|
* an output media file.
|
|
*
|
|
* @param s Media file handle, must be allocated with avformat_alloc_context().
|
|
* Its oformat field must be set to the desired output format;
|
|
* Its pb field must be set to an already openened AVIOContext.
|
|
* @param options An AVDictionary filled with AVFormatContext and muxer-private options.
|
|
* On return this parameter will be destroyed and replaced with a dict containing
|
|
* options that were not found. May be NULL.
|
|
*
|
|
* @return 0 on success, negative AVERROR on failure.
|
|
*
|
|
* @see av_opt_find, av_dict_set, avio_open, av_oformat_next.
|
|
*/
|
|
int avformat_write_header(AVFormatContext *s, AVDictionary **options);
|
|
|
|
#if FF_API_FORMAT_PARAMETERS
|
|
/**
|
|
* Allocate the stream private data and write the stream header to an
|
|
* output media file.
|
|
* @note: this sets stream time-bases, if possible to stream->codec->time_base
|
|
* but for some formats it might also be some other time base
|
|
*
|
|
* @param s media file handle
|
|
* @return 0 if OK, AVERROR_xxx on error
|
|
*
|
|
* @deprecated use avformat_write_header.
|
|
*/
|
|
attribute_deprecated int av_write_header(AVFormatContext *s);
|
|
#endif
|
|
|
|
/**
|
|
* Write a packet to an output media file.
|
|
*
|
|
* The packet shall contain one audio or video frame.
|
|
* The packet must be correctly interleaved according to the container
|
|
* specification, if not then av_interleaved_write_frame must be used.
|
|
*
|
|
* @param s media file handle
|
|
* @param pkt The packet, which contains the stream_index, buf/buf_size,
|
|
dts/pts, ...
|
|
* @return < 0 on error, = 0 if OK, 1 if end of stream wanted
|
|
*/
|
|
int av_write_frame(AVFormatContext *s, AVPacket *pkt);
|
|
|
|
/**
|
|
* Write a packet to an output media file ensuring correct interleaving.
|
|
*
|
|
* The packet must contain one audio or video frame.
|
|
* If the packets are already correctly interleaved, the application should
|
|
* call av_write_frame() instead as it is slightly faster. It is also important
|
|
* to keep in mind that completely non-interleaved input will need huge amounts
|
|
* of memory to interleave with this, so it is preferable to interleave at the
|
|
* demuxer level.
|
|
*
|
|
* @param s media file handle
|
|
* @param pkt The packet, which contains the stream_index, buf/buf_size,
|
|
dts/pts, ...
|
|
* @return < 0 on error, = 0 if OK, 1 if end of stream wanted
|
|
*/
|
|
int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
|
|
|
|
/**
|
|
* Interleave a packet per dts in an output media file.
|
|
*
|
|
* Packets with pkt->destruct == av_destruct_packet will be freed inside this
|
|
* function, so they cannot be used after it. Note that calling av_free_packet()
|
|
* on them is still safe.
|
|
*
|
|
* @param s media file handle
|
|
* @param out the interleaved packet will be output here
|
|
* @param pkt the input packet
|
|
* @param flush 1 if no further packets are available as input and all
|
|
* remaining packets should be output
|
|
* @return 1 if a packet was output, 0 if no packet could be output,
|
|
* < 0 if an error occurred
|
|
*/
|
|
int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
|
|
AVPacket *pkt, int flush);
|
|
|
|
/**
|
|
* Write the stream trailer to an output media file and free the
|
|
* file private data.
|
|
*
|
|
* May only be called after a successful call to av_write_header.
|
|
*
|
|
* @param s media file handle
|
|
* @return 0 if OK, AVERROR_xxx on error
|
|
*/
|
|
int av_write_trailer(AVFormatContext *s);
|
|
|
|
/**
|
|
* Get timing information for the data currently output.
|
|
* The exact meaning of "currently output" depends on the format.
|
|
* It is mostly relevant for devices that have an internal buffer and/or
|
|
* work in real time.
|
|
* @param s media file handle
|
|
* @param stream stream in the media file
|
|
* @param dts[out] DTS of the last packet output for the stream, in stream
|
|
* time_base units
|
|
* @param wall[out] absolute time when that packet whas output,
|
|
* in microsecond
|
|
* @return 0 if OK, AVERROR(ENOSYS) if the format does not support it
|
|
* Note: some formats or devices may not allow to measure dts and wall
|
|
* atomically.
|
|
*/
|
|
int av_get_output_timestamp(struct AVFormatContext *s, int stream,
|
|
int64_t *dts, int64_t *wall);
|
|
|
|
#if FF_API_DUMP_FORMAT
|
|
/**
|
|
* @deprecated Deprecated in favor of av_dump_format().
|
|
*/
|
|
attribute_deprecated void dump_format(AVFormatContext *ic,
|
|
int index,
|
|
const char *url,
|
|
int is_output);
|
|
#endif
|
|
|
|
void av_dump_format(AVFormatContext *ic,
|
|
int index,
|
|
const char *url,
|
|
int is_output);
|
|
|
|
#if FF_API_PARSE_DATE
|
|
/**
|
|
* Parse datestr and return a corresponding number of microseconds.
|
|
*
|
|
* @param datestr String representing a date or a duration.
|
|
* See av_parse_time() for the syntax of the provided string.
|
|
* @deprecated in favor of av_parse_time()
|
|
*/
|
|
attribute_deprecated
|
|
int64_t parse_date(const char *datestr, int duration);
|
|
#endif
|
|
|
|
/**
|
|
* Get the current time in microseconds.
|
|
*/
|
|
int64_t av_gettime(void);
|
|
|
|
#if FF_API_FIND_INFO_TAG
|
|
/**
|
|
* @deprecated use av_find_info_tag in libavutil instead.
|
|
*/
|
|
attribute_deprecated int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
|
|
#endif
|
|
|
|
/**
|
|
* Return in 'buf' the path with '%d' replaced by a number.
|
|
*
|
|
* Also handles the '%0nd' format where 'n' is the total number
|
|
* of digits and '%%'.
|
|
*
|
|
* @param buf destination buffer
|
|
* @param buf_size destination buffer size
|
|
* @param path numbered sequence string
|
|
* @param number frame number
|
|
* @return 0 if OK, -1 on format error
|
|
*/
|
|
int av_get_frame_filename(char *buf, int buf_size,
|
|
const char *path, int number);
|
|
|
|
/**
|
|
* Check whether filename actually is a numbered sequence generator.
|
|
*
|
|
* @param filename possible numbered sequence string
|
|
* @return 1 if a valid numbered sequence string, 0 otherwise
|
|
*/
|
|
int av_filename_number_test(const char *filename);
|
|
|
|
/**
|
|
* Generate an SDP for an RTP session.
|
|
*
|
|
* @param ac array of AVFormatContexts describing the RTP streams. If the
|
|
* array is composed by only one context, such context can contain
|
|
* multiple AVStreams (one AVStream per RTP stream). Otherwise,
|
|
* all the contexts in the array (an AVCodecContext per RTP stream)
|
|
* must contain only one AVStream.
|
|
* @param n_files number of AVCodecContexts contained in ac
|
|
* @param buf buffer where the SDP will be stored (must be allocated by
|
|
* the caller)
|
|
* @param size the size of the buffer
|
|
* @return 0 if OK, AVERROR_xxx on error
|
|
*/
|
|
int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size);
|
|
|
|
#if FF_API_SDP_CREATE
|
|
attribute_deprecated int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size);
|
|
#endif
|
|
|
|
/**
|
|
* Return a positive value if the given filename has one of the given
|
|
* extensions, 0 otherwise.
|
|
*
|
|
* @param extensions a comma-separated list of filename extensions
|
|
*/
|
|
int av_match_ext(const char *filename, const char *extensions);
|
|
|
|
/**
|
|
* Test if the given container can store a codec.
|
|
*
|
|
* @param std_compliance standards compliance level, one of FF_COMPLIANCE_*
|
|
*
|
|
* @return 1 if codec with ID codec_id can be stored in ofmt, 0 if it cannot.
|
|
* A negative number if this information is not available.
|
|
*/
|
|
int avformat_query_codec(AVOutputFormat *ofmt, enum CodecID codec_id, int std_compliance);
|
|
|
|
/**
|
|
* Get the AVClass for AVFormatContext. It can be used in combination with
|
|
* AV_OPT_SEARCH_FAKE_OBJ for examining options.
|
|
*
|
|
* @see av_opt_find().
|
|
*/
|
|
const AVClass *avformat_get_class(void);
|
|
|
|
#endif /* AVFORMAT_AVFORMAT_H */
|