ffmpeg/libav: lavc54.lavf54.lavu52 -> lavc54.lavf54.lavu52.lavr01: Adding libavresample of version 9

1 files changed, 1749 insertions, 0 deletions

diff --git a/make/stub_includes/libav/lavc54.lavf54.lavu52.lavr01/libavformat/avformat.h b/make/stub_includes/libav/lavc54.lavf54.lavu52.lavr01/libavformat/avformat.h
new file mode 100644
index 000000000..149b66f1c
--- /dev/null
+++ b/make/stub_includes/libav/lavc54.lavf54.lavu52.lavr01/libavformat/avformat.h
@@ -0,0 +1,1749 @@
+/*
+ * copyright (c) 2001 Fabrice Bellard
+ *
+ * This file is part of Libav.
+ *
+ * Libav is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * Libav is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVFORMAT_AVFORMAT_H
+#define AVFORMAT_AVFORMAT_H
+
+/**
+ * @file
+ * @ingroup libavf
+ * Main libavformat public API header
+ */
+
+/**
+ * @defgroup libavf I/O and Muxing/Demuxing Library
+ * @{
+ *
+ * Libavformat (lavf) is a library for dealing with various media container
+ * formats. Its main two purposes are demuxing - i.e. splitting a media file
+ * into component streams, and the reverse process of muxing - writing supplied
+ * data in a specified container format. It also has an @ref lavf_io
+ * "I/O module" which supports a number of protocols for accessing the data (e.g.
+ * file, tcp, http and others). Before using lavf, you need to call
+ * av_register_all() to register all compiled muxers, demuxers and protocols.
+ * Unless you are absolutely sure you won't use libavformat's network
+ * capabilities, you should also call avformat_network_init().
+ *
+ * A supported input format is described by an AVInputFormat struct, conversely
+ * an output format is described by AVOutputFormat. You can iterate over all
+ * registered input/output formats using the av_iformat_next() /
+ * av_oformat_next() functions. The protocols layer is not part of the public
+ * API, so you can only get the names of supported protocols with the
+ * avio_enum_protocols() function.
+ *
+ * Main lavf structure used for both muxing and demuxing is AVFormatContext,
+ * which exports all information about the file being read or written. As with
+ * most Libav structures, its size is not part of public ABI, so it cannot be
+ * allocated on stack or directly with av_malloc(). To create an
+ * AVFormatContext, use avformat_alloc_context() (some functions, like
+ * avformat_open_input() might do that for you).
+ *
+ * Most importantly an AVFormatContext contains:
+ * @li the @ref AVFormatContext.iformat "input" or @ref AVFormatContext.oformat
+ * "output" format. It is either autodetected or set by user for input;
+ * always set by user for output.
+ * @li an @ref AVFormatContext.streams "array" of AVStreams, which describe all
+ * elementary streams stored in the file. AVStreams are typically referred to
+ * using their index in this array.
+ * @li an @ref AVFormatContext.pb "I/O context". It is either opened by lavf or
+ * set by user for input, always set by user for output (unless you are dealing
+ * with an AVFMT_NOFILE format).
+ *
+ * @section lavf_options Passing options to (de)muxers
+ * Lavf allows to configure muxers and demuxers using the @ref avoptions
+ * mechanism. Generic (format-independent) libavformat options are provided by
+ * AVFormatContext, they can be examined from a user program by calling
+ * av_opt_next() / av_opt_find() on an allocated AVFormatContext (or its AVClass
+ * from avformat_get_class()). Private (format-specific) options are provided by
+ * AVFormatContext.priv_data if and only if AVInputFormat.priv_class /
+ * AVOutputFormat.priv_class of the corresponding format struct is non-NULL.
+ * Further options may be provided by the @ref AVFormatContext.pb "I/O context",
+ * if its AVClass is non-NULL, and the protocols layer. See the discussion on
+ * nesting in @ref avoptions documentation to learn how to access those.
+ *
+ * @defgroup lavf_decoding Demuxing
+ * @{
+ * Demuxers read a media file and split it into chunks of data (@em packets). A
+ * @ref AVPacket "packet" contains one or more encoded frames which belongs to a
+ * single elementary stream. In the lavf API this process is represented by the
+ * avformat_open_input() function for opening a file, av_read_frame() for
+ * reading a single packet and finally avformat_close_input(), which does the
+ * cleanup.
+ *
+ * @section lavf_decoding_open Opening a media file
+ * The minimum information required to open a file is its URL or filename, which
+ * is passed to avformat_open_input(), as in the following code:
+ * @code
+ * const char    *url = "in.mp3";
+ * AVFormatContext *s = NULL;
+ * int ret = avformat_open_input(&s, url, NULL, NULL);
+ * if (ret < 0)
+ *     abort();
+ * @endcode
+ * The above code attempts to allocate an AVFormatContext, open the
+ * specified file (autodetecting the format) and read the header, exporting the
+ * information stored there into s. Some formats do not have a header or do not
+ * store enough information there, so it is recommended that you call the
+ * avformat_find_stream_info() function which tries to read and decode a few
+ * frames to find missing information.
+ *
+ * In some cases you might want to preallocate an AVFormatContext yourself with
+ * avformat_alloc_context() and do some tweaking on it before passing it to
+ * avformat_open_input(). One such case is when you want to use custom functions
+ * for reading input data instead of lavf internal I/O layer.
+ * To do that, create your own AVIOContext with avio_alloc_context(), passing
+ * your reading callbacks to it. Then set the @em pb field of your
+ * AVFormatContext to newly created AVIOContext.
+ *
+ * Since the format of the opened file is in general not known until after
+ * avformat_open_input() has returned, it is not possible to set demuxer private
+ * options on a preallocated context. Instead, the options should be passed to
+ * avformat_open_input() wrapped in an AVDictionary:
+ * @code
+ * AVDictionary *options = NULL;
+ * av_dict_set(&options, "video_size", "640x480", 0);
+ * av_dict_set(&options, "pixel_format", "rgb24", 0);
+ *
+ * if (avformat_open_input(&s, url, NULL, &options) < 0)
+ *     abort();
+ * av_dict_free(&options);
+ * @endcode
+ * This code passes the private options 'video_size' and 'pixel_format' to the
+ * demuxer. They would be necessary for e.g. the rawvideo demuxer, since it
+ * cannot know how to interpret raw video data otherwise. If the format turns
+ * out to be something different than raw video, those options will not be
+ * recognized by the demuxer and therefore will not be applied. Such unrecognized
+ * options are then returned in the options dictionary (recognized options are
+ * consumed). The calling program can handle such unrecognized options as it
+ * wishes, e.g.
+ * @code
+ * AVDictionaryEntry *e;
+ * if (e = av_dict_get(options, "", NULL, AV_DICT_IGNORE_SUFFIX)) {
+ *     fprintf(stderr, "Option %s not recognized by the demuxer.\n", e->key);
+ *     abort();
+ * }
+ * @endcode
+ *
+ * After you have finished reading the file, you must close it with
+ * avformat_close_input(). It will free everything associated with the file.
+ *
+ * @section lavf_decoding_read Reading from an opened file
+ * Reading data from an opened AVFormatContext is done by repeatedly calling
+ * av_read_frame() on it. Each call, if successful, will return an AVPacket
+ * containing encoded data for one AVStream, identified by
+ * AVPacket.stream_index. This packet may be passed straight into the libavcodec
+ * decoding functions avcodec_decode_video2(), avcodec_decode_audio4() or
+ * avcodec_decode_subtitle2() if the caller wishes to decode the data.
+ *
+ * AVPacket.pts, AVPacket.dts and AVPacket.duration timing information will be
+ * set if known. They may also be unset (i.e. AV_NOPTS_VALUE for
+ * pts/dts, 0 for duration) if the stream does not provide them. The timing
+ * information will be in AVStream.time_base units, i.e. it has to be
+ * multiplied by the timebase to convert them to seconds.
+ *
+ * If AVPacket.destruct is set on the returned packet, then the packet is
+ * allocated dynamically and the user may keep it indefinitely.
+ * Otherwise, if AVPacket.destruct is NULL, the packet data is backed by a
+ * static storage somewhere inside the demuxer and the packet is only valid
+ * until the next av_read_frame() call or closing the file. If the caller
+ * requires a longer lifetime, av_dup_packet() will make an av_malloc()ed copy
+ * of it.
+ * In both cases, the packet must be freed with av_free_packet() when it is no
+ * longer needed.
+ *
+ * @section lavf_decoding_seek Seeking
+ * @}
+ *
+ * @defgroup lavf_encoding Muxing
+ * @{
+ * @}
+ *
+ * @defgroup lavf_io I/O Read/Write
+ * @{
+ * @}
+ *
+ * @defgroup lavf_codec Demuxers
+ * @{
+ * @defgroup lavf_codec_native Native Demuxers
+ * @{
+ * @}
+ * @defgroup lavf_codec_wrappers External library wrappers
+ * @{
+ * @}
+ * @}
+ * @defgroup lavf_protos I/O Protocols
+ * @{
+ * @}
+ * @defgroup lavf_internal Internal
+ * @{
+ * @}
+ * @}
+ *
+ */
+
+#include <time.h>
+#include <stdio.h>  /* FILE */
+#include "libavcodec/avcodec.h"
+#include "libavutil/dict.h"
+#include "libavutil/log.h"
+
+#include "avio.h"
+#include "libavformat/version.h"
+
+#if FF_API_AV_GETTIME
+#include "libavutil/time.h"
+#endif
+
+struct AVFormatContext;
+
+
+/**
+ * @defgroup metadata_api Public Metadata API
+ * @{
+ * @ingroup libavf
+ * The metadata API allows libavformat to export metadata tags to a client
+ * application when demuxing. Conversely it allows a client application to
+ * set metadata when muxing.
+ *
+ * Metadata is exported or set as pairs of key/value strings in the 'metadata'
+ * fields of the AVFormatContext, AVStream, AVChapter and AVProgram structs
+ * using the @ref lavu_dict "AVDictionary" API. Like all strings in Libav,
+ * metadata is assumed to be UTF-8 encoded Unicode. Note that metadata
+ * exported by demuxers isn't checked to be valid UTF-8 in most cases.
+ *
+ * Important concepts to keep in mind:
+ * -  Keys are unique; there can never be 2 tags with the same key. This is
+ *    also meant semantically, i.e., a demuxer should not knowingly produce
+ *    several keys that are literally different but semantically identical.
+ *    E.g., key=Author5, key=Author6. In this example, all authors must be
+ *    placed in the same tag.
+ * -  Metadata is flat, not hierarchical; there are no subtags. If you
+ *    want to store, e.g., the email address of the child of producer Alice
+ *    and actor Bob, that could have key=alice_and_bobs_childs_email_address.
+ * -  Several modifiers can be applied to the tag name. This is done by
+ *    appending a dash character ('-') and the modifier name in the order
+ *    they appear in the list below -- e.g. foo-eng-sort, not foo-sort-eng.
+ *    -  language -- a tag whose value is localized for a particular language
+ *       is appended with the ISO 639-2/B 3-letter language code.
+ *       For example: Author-ger=Michael, Author-eng=Mike
+ *       The original/default language is in the unqualified "Author" tag.
+ *       A demuxer should set a default if it sets any translated tag.
+ *    -  sorting  -- a modified version of a tag that should be used for
+ *       sorting will have '-sort' appended. E.g. artist="The Beatles",
+ *       artist-sort="Beatles, The".
+ *
+ * -  Demuxers attempt to export metadata in a generic format, however tags
+ *    with no generic equivalents are left as they are stored in the container.
+ *    Follows a list of generic tag names:
+ *
+ @verbatim
+ album        -- name of the set this work belongs to
+ album_artist -- main creator of the set/album, if different from artist.
+                 e.g. "Various Artists" for compilation albums.
+ artist       -- main creator of the work
+ comment      -- any additional description of the file.
+ composer     -- who composed the work, if different from artist.
+ copyright    -- name of copyright holder.
+ creation_time-- date when the file was created, preferably in ISO 8601.
+ date         -- date when the work was created, preferably in ISO 8601.
+ disc         -- number of a subset, e.g. disc in a multi-disc collection.
+ encoder      -- name/settings of the software/hardware that produced the file.
+ encoded_by   -- person/group who created the file.
+ filename     -- original name of the file.
+ genre        -- <self-evident>.
+ language     -- main language in which the work is performed, preferably
+                 in ISO 639-2 format. Multiple languages can be specified by
+                 separating them with commas.
+ performer    -- artist who performed the work, if different from artist.
+                 E.g for "Also sprach Zarathustra", artist would be "Richard
+                 Strauss" and performer "London Philharmonic Orchestra".
+ publisher    -- name of the label/publisher.
+ service_name     -- name of the service in broadcasting (channel name).
+ service_provider -- name of the service provider in broadcasting.
+ title        -- name of the work.
+ track        -- number of this work in the set, can be in form current/total.
+ variant_bitrate -- the total bitrate of the bitrate variant that the current stream is part of
+ @endverbatim
+ *
+ * Look in the examples section for an application example how to use the Metadata API.
+ *
+ * @}
+ */
+
+/* packet functions */
+
+
+/**
+ * Allocate and read the payload of a packet and initialize its
+ * fields with default values.
+ *
+ * @param pkt packet
+ * @param size desired payload size
+ * @return >0 (read size) if OK, AVERROR_xxx otherwise
+ */
+int av_get_packet(AVIOContext *s, AVPacket *pkt, int size);
+
+
+/**
+ * Read data and append it to the current content of the AVPacket.
+ * If pkt->size is 0 this is identical to av_get_packet.
+ * Note that this uses av_grow_packet and thus involves a realloc
+ * which is inefficient. Thus this function should only be used
+ * when there is no reasonable way to know (an upper bound of)
+ * the final size.
+ *
+ * @param pkt packet
+ * @param size amount of data to read
+ * @return >0 (read size) if OK, AVERROR_xxx otherwise, previous data
+ *         will not be lost even if an error occurs.
+ */
+int av_append_packet(AVIOContext *s, AVPacket *pkt, int size);
+
+/*************************************************/
+/* fractional numbers for exact pts handling */
+
+/**
+ * The exact value of the fractional number is: 'val + num / den'.
+ * num is assumed to be 0 <= num < den.
+ */
+typedef struct AVFrac {
+    int64_t val, num, den;
+} AVFrac;
+
+/*************************************************/
+/* input/output formats */
+
+struct AVCodecTag;
+
+/**
+ * This structure contains the data a format has to probe a file.
+ */
+typedef struct AVProbeData {
+    const char *filename;
+    unsigned char *buf; /**< Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero. */
+    int buf_size;       /**< Size of buf except extra allocated bytes */
+} AVProbeData;
+
+#define AVPROBE_SCORE_MAX 100               ///< maximum score, half of that is used for file-extension-based detection
+#define AVPROBE_PADDING_SIZE 32             ///< extra allocated bytes at the end of the probe buffer
+
+/// Demuxer will use avio_open, no opened file should be provided by the caller.
+#define AVFMT_NOFILE        0x0001
+#define AVFMT_NEEDNUMBER    0x0002 /**< Needs '%d' in filename. */
+#define AVFMT_SHOW_IDS      0x0008 /**< Show format stream IDs numbers. */
+#define AVFMT_RAWPICTURE    0x0020 /**< Format wants AVPicture structure for
+                                      raw picture data. */
+#define AVFMT_GLOBALHEADER  0x0040 /**< Format wants global header. */
+#define AVFMT_NOTIMESTAMPS  0x0080 /**< Format does not need / have any timestamps. */
+#define AVFMT_GENERIC_INDEX 0x0100 /**< Use generic index building code. */
+#define AVFMT_TS_DISCONT    0x0200 /**< Format allows timestamp discontinuities. Note, muxers always require valid (monotone) timestamps */
+#define AVFMT_VARIABLE_FPS  0x0400 /**< Format allows variable fps. */
+#define AVFMT_NODIMENSIONS  0x0800 /**< Format does not need width/height */
+#define AVFMT_NOSTREAMS     0x1000 /**< Format does not require any streams */
+#define AVFMT_NOBINSEARCH   0x2000 /**< Format does not allow to fallback to binary search via read_timestamp */
+#define AVFMT_NOGENSEARCH   0x4000 /**< Format does not allow to fallback to generic search */
+#define AVFMT_NO_BYTE_SEEK  0x8000 /**< Format does not allow seeking by bytes */
+#define AVFMT_ALLOW_FLUSH  0x10000 /**< Format allows flushing. If not set, the muxer will not receive a NULL packet in the write_packet function. */
+#define AVFMT_TS_NONSTRICT 0x20000 /**< Format does not require strictly
+                                        increasing timestamps, but they must
+                                        still be monotonic */
+
+/**
+ * @addtogroup lavf_encoding
+ * @{
+ */
+typedef struct AVOutputFormat {
+    const char *name;
+    /**
+     * Descriptive name for the format, meant to be more human-readable
+     * than name. You should use the NULL_IF_CONFIG_SMALL() macro
+     * to define it.
+     */
+    const char *long_name;
+    const char *mime_type;
+    const char *extensions; /**< comma-separated filename extensions */
+    /* output support */
+    enum AVCodecID audio_codec;    /**< default audio codec */
+    enum AVCodecID video_codec;    /**< default video codec */
+    enum AVCodecID subtitle_codec; /**< default subtitle codec */
+    /**
+     * can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_RAWPICTURE,
+     * AVFMT_GLOBALHEADER, AVFMT_NOTIMESTAMPS, AVFMT_VARIABLE_FPS,
+     * AVFMT_NODIMENSIONS, AVFMT_NOSTREAMS, AVFMT_ALLOW_FLUSH,
+     * AVFMT_TS_NONSTRICT
+     */
+    int flags;
+
+    /**
+     * List of supported codec_id-codec_tag pairs, ordered by "better
+     * choice first". The arrays are all terminated by AV_CODEC_ID_NONE.
+     */
+    const struct AVCodecTag * const *codec_tag;
+
+
+    const AVClass *priv_class; ///< AVClass for the private context
+
+    /*****************************************************************
+     * No fields below this line are part of the public API. They
+     * may not be used outside of libavformat and can be changed and
+     * removed at will.
+     * New public fields should be added right above.
+     *****************************************************************
+     */
+    struct AVOutputFormat *next;
+    /**
+     * size of private data so that it can be allocated in the wrapper
+     */
+    int priv_data_size;
+
+    int (*write_header)(struct AVFormatContext *);
+    /**
+     * Write a packet. If AVFMT_ALLOW_FLUSH is set in flags,
+     * pkt can be NULL in order to flush data buffered in the muxer.
+     * When flushing, return 0 if there still is more data to flush,
+     * or 1 if everything was flushed and there is no more buffered
+     * data.
+     */
+    int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
+    int (*write_trailer)(struct AVFormatContext *);
+    /**
+     * Currently only used to set pixel format if not YUV420P.
+     */
+    int (*interleave_packet)(struct AVFormatContext *, AVPacket *out,
+                             AVPacket *in, int flush);
+    /**
+     * Test if the given codec can be stored in this container.
+     *
+     * @return 1 if the codec is supported, 0 if it is not.
+     *         A negative number if unknown.
+     */
+    int (*query_codec)(enum AVCodecID id, int std_compliance);
+} AVOutputFormat;
+/**
+ * @}
+ */
+
+/**
+ * @addtogroup lavf_decoding
+ * @{
+ */
+typedef struct AVInputFormat {
+    /**
+     * A comma separated list of short names for the format. New names
+     * may be appended with a minor bump.
+     */
+    const char *name;
+
+    /**
+     * Descriptive name for the format, meant to be more human-readable
+     * than name. You should use the NULL_IF_CONFIG_SMALL() macro
+     * to define it.
+     */
+    const char *long_name;
+
+    /**
+     * Can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_SHOW_IDS,
+     * AVFMT_GENERIC_INDEX, AVFMT_TS_DISCONT, AVFMT_NOBINSEARCH,
+     * AVFMT_NOGENSEARCH, AVFMT_NO_BYTE_SEEK.
+     */
+    int flags;
+
+    /**
+     * If extensions are defined, then no probe is done. You should
+     * usually not use extension format guessing because it is not
+     * reliable enough
+     */
+    const char *extensions;
+
+    const struct AVCodecTag * const *codec_tag;
+
+    const AVClass *priv_class; ///< AVClass for the private context
+
+    /*****************************************************************
+     * No fields below this line are part of the public API. They
+     * may not be used outside of libavformat and can be changed and
+     * removed at will.
+     * New public fields should be added right above.
+     *****************************************************************
+     */
+    struct AVInputFormat *next;
+
+    /**
+     * Raw demuxers store their codec ID here.
+     */
+    int raw_codec_id;
+
+    /**
+     * Size of private data so that it can be allocated in the wrapper.
+     */
+    int priv_data_size;
+
+    /**
+     * Tell if a given file has a chance of being parsed as this format.
+     * The buffer provided is guaranteed to be AVPROBE_PADDING_SIZE bytes
+     * big so you do not have to check for that unless you need more.
+     */
+    int (*read_probe)(AVProbeData *);
+
+    /**
+     * Read the format header and initialize the AVFormatContext
+     * structure. Return 0 if OK. Only used in raw format right
+     * now. 'avformat_new_stream' should be called to create new streams.
+     */
+    int (*read_header)(struct AVFormatContext *);
+
+    /**
+     * Read one packet and put it in 'pkt'. pts and flags are also
+     * set. 'avformat_new_stream' can be called only if the flag
+     * AVFMTCTX_NOHEADER is used and only in the calling thread (not in a
+     * background thread).
+     * @return 0 on success, < 0 on error.
+     *         When returning an error, pkt must not have been allocated
+     *         or must be freed before returning
+     */
+    int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
+
+    /**
+     * Close the stream. The AVFormatContext and AVStreams are not
+     * freed by this function
+     */
+    int (*read_close)(struct AVFormatContext *);
+
+    /**
+     * Seek to a given timestamp relative to the frames in
+     * stream component stream_index.
+     * @param stream_index Must not be -1.
+     * @param flags Selects which direction should be preferred if no exact
+     *              match is available.
+     * @return >= 0 on success (but not necessarily the new offset)
+     */
+    int (*read_seek)(struct AVFormatContext *,
+                     int stream_index, int64_t timestamp, int flags);
+
+    /**
+     * Get the next timestamp in stream[stream_index].time_base units.
+     * @return the timestamp or AV_NOPTS_VALUE if an error occurred
+     */
+    int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
+                              int64_t *pos, int64_t pos_limit);
+
+    /**
+     * Start/resume playing - only meaningful if using a network-based format
+     * (RTSP).
+     */
+    int (*read_play)(struct AVFormatContext *);
+
+    /**
+     * Pause playing - only meaningful if using a network-based format
+     * (RTSP).
+     */
+    int (*read_pause)(struct AVFormatContext *);
+
+    /**
+     * 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.
+     */
+    int (*read_seek2)(struct AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
+} AVInputFormat;
+/**
+ * @}
+ */
+
+enum AVStreamParseType {
+    AVSTREAM_PARSE_NONE,
+    AVSTREAM_PARSE_FULL,       /**< full parsing and repack */
+    AVSTREAM_PARSE_HEADERS,    /**< Only parse headers, do not repack. */
+    AVSTREAM_PARSE_TIMESTAMPS, /**< full parsing and interpolation of timestamps for frames not starting on a packet boundary */
+    AVSTREAM_PARSE_FULL_ONCE,  /**< full parsing and repack of the first frame only, only implemented for H.264 currently */
+};
+
+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 */
+/**
+ * The stream is stored in the file as an attached picture/"cover art" (e.g.
+ * APIC frame in ID3v2). The single packet associated with it will be returned
+ * among the first few packets read from the file unless seeking takes place.
+ * It can also be accessed at any time in AVStream.attached_pic.
+ */
+#define AV_DISPOSITION_ATTACHED_PIC      0x0400
+
+/**
+ * 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 */
+    /**
+     * Format-specific stream ID.
+     * decoding: set by libavformat
+     * encoding: set by the user, replaced by libavformat if left unset
+     */
+    int id;
+    /**
+     * Codec context associated with this stream. Allocated and freed by
+     * libavformat.
+     *
+     * - decoding: The demuxer exports codec information stored in the headers
+     *             here.
+     * - encoding: The user sets codec information, the muxer writes it to the
+     *             output. Mandatory fields as specified in AVCodecContext
+     *             documentation must be set even if this AVCodecContext is
+     *             not actually used for encoding.
+     */
+    AVCodecContext *codec;
+#if FF_API_R_FRAME_RATE
+    /**
+     * 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;
+#endif
+    void *priv_data;
+
+    /**
+     * 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.
+     *
+     * decoding: set by libavformat
+     * encoding: set by libavformat in avformat_write_header. The muxer may use the
+     * user-provided value of @ref AVCodecContext.time_base "codec->time_base"
+     * as a hint.
+     */
+    AVRational time_base;
+
+    /**
+     * 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).
+     */
+    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;
+
+    int64_t nb_frames;                 ///< number of frames in this stream if known or 0
+
+    int disposition; /**< AV_DISPOSITION_* bit field */
+
+    enum AVDiscard discard; ///< Selects which packets can be discarded at will and do not need to be demuxed.
+
+    /**
+     * sample aspect ratio (0 if unknown)
+     * - encoding: Set by user.
+     * - decoding: Set by libavformat.
+     */
+    AVRational sample_aspect_ratio;
+
+    AVDictionary *metadata;
+
+    /**
+     * Average framerate
+     */
+    AVRational avg_frame_rate;
+
+    /**
+     * For streams with AV_DISPOSITION_ATTACHED_PIC disposition, this packet
+     * will contain the attached picture.
+     *
+     * decoding: set by libavformat, must not be modified by the caller.
+     * encoding: unused
+     */
+    AVPacket attached_pic;
+
+    /*****************************************************************
+     * All fields below this line are not part of the public API. They
+     * may not be used outside of libavformat and can be changed and
+     * removed at will.
+     * New public fields should be added right above.
+     *****************************************************************
+     */
+
+    /**
+     * Stream information used internally by av_find_stream_info()
+     */
+#define MAX_STD_TIMEBASES (60*12+5)
+    struct {
+#if FF_API_R_FRAME_RATE
+        int64_t last_dts;
+        int64_t duration_gcd;
+        int duration_count;
+        double duration_error[MAX_STD_TIMEBASES];
+#endif
+        int nb_decoded_frames;
+        int found_decoder;
+
+        /**
+         * Those are used for average framerate estimation.
+         */
+        int64_t fps_first_dts;
+        int     fps_first_dts_idx;
+        int64_t fps_last_dts;
+        int     fps_last_dts_idx;
+
+    } *info;
+
+    int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
+
+    // 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;
+    int64_t first_dts;
+    int64_t cur_dts;
+    int64_t last_IP_pts;
+    int last_IP_duration;
+
+    /**
+     * Number of packets to buffer for codec probing
+     */
+#define MAX_PROBE_PACKETS 2500
+    int probe_packets;
+
+    /**
+     * Number of frames that have been demuxed during av_find_stream_info()
+     */
+    int codec_info_nb_frames;
+
+    /* av_read_frame() support */
+    enum AVStreamParseType need_parsing;
+    struct AVCodecParserContext *parser;
+
+    /**
+     * last packet in packet_buffer for this stream when muxing.
+     */
+    struct AVPacketList *last_in_packet_buffer;
+    AVProbeData probe_data;
+#define MAX_REORDER_DELAY 16
+    int64_t pts_buffer[MAX_REORDER_DELAY+1];
+
+    AVIndexEntry *index_entries; /**< Only used if the format does not
+                                    support seeking natively. */
+    int nb_index_entries;
+    unsigned int index_entries_allocated_size;
+} 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;
+} 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*, use
+ * avformat_alloc_context() to create an AVFormatContext.
+ */
+typedef struct AVFormatContext {
+    /**
+     * A class for logging and AVOptions. Set by avformat_alloc_context().
+     * Exports (de)muxer private options if they exist.
+     */
+    const AVClass *av_class;
+
+    /**
+     * Can only be iformat or oformat, not both at the same time.
+     *
+     * decoding: set by avformat_open_input().
+     * encoding: set by the user.
+     */
+    struct AVInputFormat *iformat;
+    struct AVOutputFormat *oformat;
+
+    /**
+     * Format private data. This is an AVOptions-enabled struct
+     * if and only if iformat/oformat.priv_class is not NULL.
+     */
+    void *priv_data;
+
+    /**
+     * I/O context.
+     *
+     * decoding: either set by the user before avformat_open_input() (then
+     * the user must close it manually) or set by avformat_open_input().
+     * encoding: set by the user.
+     *
+     * Do NOT set this field if AVFMT_NOFILE flag is set in
+     * iformat/oformat.flags. In such a case, the (de)muxer will handle
+     * I/O in some other way and this field will be NULL.
+     */
+    AVIOContext *pb;
+
+    /* stream info */
+    int ctx_flags; /**< Format-specific flags, see AVFMTCTX_xx */
+
+    /**
+     * A list of all streams in the file. New streams are created with
+     * avformat_new_stream().
+     *
+     * decoding: streams are created by libavformat in avformat_open_input().
+     * If AVFMTCTX_NOHEADER is set in ctx_flags, then new streams may also
+     * appear in av_read_frame().
+     * encoding: streams are created by the user before avformat_write_header().
+     */
+    unsigned int nb_streams;
+    AVStream **streams;
+
+    char filename[1024]; /**< input or output filename */
+
+    /**
+     * 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 do not set any of them. This is deduced from the
+     * AVStream values if not set.
+     */
+    int64_t duration;
+
+    /**
+     * 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 Libav can compute it automatically.
+     */
+    int bit_rate;
+
+    unsigned int packet_size;
+    int max_delay;
+
+    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
+#define AVFMT_FLAG_NOBUFFER     0x0040 ///< Do not buffer frames when possible
+#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
+
+    /**
+     * decoding: size of data to probe; encoding: unused.
+     */
+    unsigned int probesize;
+
+    /**
+     * decoding: maximum time (in AV_TIME_BASE units) during which the input should
+     * be analyzed in avformat_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 AVCodecID video_codec_id;
+
+    /**
+     * Forced audio codec_id.
+     * Demuxing: Set by user.
+     */
+    enum AVCodecID audio_codec_id;
+
+    /**
+     * Forced subtitle codec_id.
+     * Demuxing: Set by user.
+     */
+    enum AVCodecID 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;
+
+    AVDictionary *metadata;
+
+    /**
+     * 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;
+
+    /**
+     * Custom interrupt callbacks for the I/O layer.
+     *
+     * decoding: set by the user before avformat_open_input().
+     * encoding: set by the user before avformat_write_header()
+     * (mainly useful for AVFMT_NOFILE formats). The callback
+     * should also be passed to avio_open2() if it's used to
+     * open the file.
+     */
+    AVIOInterruptCB interrupt_callback;
+
+    /**
+     * Flags to enable debugging.
+     */
+    int debug;
+#define FF_FDEBUG_TS        0x0001
+    /*****************************************************************
+     * All fields below this line are not part of the public API. They
+     * may not be used outside of libavformat and can be changed and
+     * removed at will.
+     * New public fields should be added right above.
+     *****************************************************************
+     */
+
+    /**
+     * 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;
+    struct AVPacketList *packet_buffer_end;
+
+    /* av_seek_frame() support */
+    int64_t data_offset; /**< offset of the first packet */
+
+    /**
+     * 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;
+    /**
+     * Packets split by the parser get queued here.
+     */
+    struct AVPacketList *parse_queue;
+    struct AVPacketList *parse_queue_end;
+    /**
+     * Remaining size available for raw_packet_buffer, in bytes.
+     */
+#define RAW_PACKET_BUFFER_SIZE 2500000
+    int raw_packet_buffer_remaining_size;
+} AVFormatContext;
+
+typedef struct AVPacketList {
+    AVPacket pkt;
+    struct AVPacketList *next;
+} AVPacketList;
+
+
+/**
+ * @defgroup lavf_core Core functions
+ * @ingroup libavf
+ *
+ * Functions for querying libavformat capabilities, allocating core structures,
+ * etc.
+ * @{
+ */
+
+/**
+ * Return the LIBAVFORMAT_VERSION_INT constant.
+ */
+unsigned avformat_version(void);
+
+/**
+ * Return the libavformat build-time configuration.
+ */
+const char *avformat_configuration(void);
+
+/**
+ * Return the libavformat license.
+ */
+const char *avformat_license(void);
+
+/**
+ * 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);
+
+void av_register_input_format(AVInputFormat *format);
+void av_register_output_format(AVOutputFormat *format);
+
+/**
+ * Do global initialization of network components. This is optional,
+ * but recommended, since it avoids the overhead of implicitly
+ * doing the setup for each session.
+ *
+ * Calling this function will become mandatory if using network
+ * protocols at some major version bump.
+ */
+int avformat_network_init(void);
+
+/**
+ * Undo the initialization done by avformat_network_init.
+ */
+int avformat_network_deinit(void);
+
+/**
+ * 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);
+
+/**
+ * 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);
+
+/**
+ * Free an AVFormatContext and all its streams.
+ * @param s context to free
+ */
+void avformat_free_context(AVFormatContext *s);
+
+/**
+ * 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);
+
+/**
+ * Add a new stream to a media file.
+ *
+ * When demuxing, it is called by the demuxer in read_header(). If the
+ * flag AVFMTCTX_NOHEADER is set in s.ctx_flags, then it may also
+ * be called in read_packet().
+ *
+ * When muxing, should be called by the user before avformat_write_header().
+ *
+ * @param c If non-NULL, the AVCodecContext corresponding to the new stream
+ * will be initialized to use this codec. This is needed for e.g. codec-specific
+ * defaults to be set, so codec should be provided if it is known.
+ *
+ * @return newly created stream or NULL on error.
+ */
+AVStream *avformat_new_stream(AVFormatContext *s, AVCodec *c);
+
+AVProgram *av_new_program(AVFormatContext *s, int id);
+
+/**
+ * @}
+ */
+
+
+/**
+ * @addtogroup lavf_decoding
+ * @{
+ */
+
+/**
+ * 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);
+
+/**
+ * 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);
+
+/**
+ * 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);
+
+/**
+ * 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 "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);
+
+#if FF_API_READ_PACKET
+/**
+ * @deprecated use AVFMT_FLAG_NOFILLIN | AVFMT_FLAG_NOPARSE to read raw
+ * unprocessed packets
+ *
+ * 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
+ */
+attribute_deprecated
+int av_read_packet(AVFormatContext *s, AVPacket *pkt);
+#endif
+
+/**
+ * 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.
+ *
+ * If pkt->destruct is NULL, then the packet is valid until the next
+ * av_read_frame() or until av_close_input_file(). Otherwise the packet is valid
+ * indefinitely. In both cases the packet must be freed with
+ * av_free_packet when it is no longer needed. 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);
+
+#if FF_API_CLOSE_INPUT_FILE
+/**
+ * @deprecated use avformat_close_input()
+ * Close a media file (but not its codecs).
+ *
+ * @param s media file handle
+ */
+attribute_deprecated
+void av_close_input_file(AVFormatContext *s);
+#endif
+
+/**
+ * Close an opened input AVFormatContext. Free it and all its contents
+ * and set *s to NULL.
+ */
+void avformat_close_input(AVFormatContext **s);
+/**
+ * @}
+ */
+
+#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
+
+/**
+ * @addtogroup lavf_encoding
+ * @{
+ */
+/**
+ * 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);
+
+/**
+ * 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, ...
+ *            This can be NULL (at any time, not just at the end), in
+ *            order to immediately flush data buffered within the muxer,
+ *            for muxers that buffer up data internally before writing it
+ *            to the output.
+ * @return < 0 on error, = 0 if OK, 1 if flushed and there is no more data to flush
+ */
+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 containing the data to be written. Libavformat takes
+ * ownership of the data and will free it when it sees fit using the packet's
+ * @ref AVPacket.destruct "destruct" field. The caller must not access the data
+ * after this function returns, as it may already be freed.
+ * This can be NULL (at any time, not just at the end), to flush the
+ * interleaving queues.
+ * Packet's @ref AVPacket.stream_index "stream_index" field must be set to the
+ * index of the corresponding stream in @ref AVFormatContext.streams
+ * "s.streams".
+ * It is very strongly recommended that timing information (@ref AVPacket.pts
+ * "pts", @ref AVPacket.dts "dts" @ref AVPacket.duration "duration") is set to
+ * correct values.
+ *
+ * @return 0 on success, a negative AVERROR on error.
+ */
+int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
+
+#if FF_API_INTERLEAVE_PACKET
+/**
+ * @deprecated this function was never meant to be called by the user
+ * programs.
+ */
+attribute_deprecated
+int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
+                                 AVPacket *pkt, int flush);
+#endif
+
+/**
+ * Write the stream trailer to an output media file and free the
+ * file private data.
+ *
+ * May only be called after a successful call to avformat_write_header.
+ *
+ * @param s media file handle
+ * @return 0 if OK, AVERROR_xxx on error
+ */
+int av_write_trailer(AVFormatContext *s);
+
+/**
+ * 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 AVCodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
+                            const char *filename, const char *mime_type,
+                            enum AVMediaType type);
+
+/**
+ * @}
+ */
+
+
+/**
+ * @defgroup lavf_misc Utility functions
+ * @ingroup libavf
+ * @{
+ *
+ * Miscellaneous utility functions related to both muxing and demuxing
+ * (or neither).
+ */
+
+/**
+ * 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, const 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, const 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);
+
+/**
+ * Get the AVCodecID for the given codec tag tag.
+ * If no codec id is found returns AV_CODEC_ID_NONE.
+ *
+ * @param tags list of supported codec_id-codec_tag pairs, as stored
+ * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
+ */
+enum AVCodecID 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 AVCodecID id);
+
+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);
+
+
+/**
+ * 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);
+
+
+void av_dump_format(AVFormatContext *ic,
+                    int index,
+                    const char *url,
+                    int is_output);
+
+/**
+ * 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.
+ *
+ * Note, this overwrites the id values of AVStreams in the muxer contexts
+ * for getting unique dynamic payload types.
+ *
+ * @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);
+
+/**
+ * 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 AVCodecID codec_id, int std_compliance);
+
+/**
+ * @defgroup riff_fourcc RIFF FourCCs
+ * @{
+ * Get the tables mapping RIFF FourCCs to libavcodec AVCodecIDs. The tables are
+ * meant to be passed to av_codec_get_id()/av_codec_get_tag() as in the
+ * following code:
+ * @code
+ * uint32_t tag = MKTAG('H', '2', '6', '4');
+ * const struct AVCodecTag *table[] = { avformat_get_riff_video_tags(), 0 };
+ * enum AVCodecID id = av_codec_get_id(table, tag);
+ * @endcode
+ */
+/**
+ * @return the table mapping RIFF FourCCs for video to libavcodec AVCodecID.
+ */
+const struct AVCodecTag *avformat_get_riff_video_tags(void);
+/**
+ * @return the table mapping RIFF FourCCs for audio to AVCodecID.
+ */
+const struct AVCodecTag *avformat_get_riff_audio_tags(void);
+/**
+ * @}
+ */
+
+/**
+ * @}
+ */
+
+#endif /* AVFORMAT_AVFORMAT_H */