Adding libav (ffmpeg) header file, allowing upcoming dynamic linked GLMediaPlayer impl. to be compiled (LGPL terms)

Libav header:
  libavutil   51.22.1
  libavformat 53.21.0
  libavcodec  53.35.0

.. just to ease our compile time setup.

3 files changed, 2840 insertions, 0 deletions

diff --git a/make/stub_includes/libav/libavformat/avformat.h b/make/stub_includes/libav/libavformat/avformat.h
new file mode 100644
index 000000000..22a89d3cd
--- /dev/null
+++ b/make/stub_includes/libav/libavformat/avformat.h
@@ -0,0 +1,2026 @@
+/*
+ * 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).
+ *
+ * @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 frames which belong a single
+ * elementary stream. In 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.
+ *
+ * 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
+ *
+ * @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"
+
+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.
+ *
+ * @}
+ */
+
+#if FF_API_OLD_METADATA2
+/**
+ * @defgroup old_metadata Old metadata API
+ * The following functions are deprecated, use
+ * their equivalents from libavutil/dict.h instead.
+ * @{
+ */
+
+#define AV_METADATA_MATCH_CASE      AV_DICT_MATCH_CASE
+#define AV_METADATA_IGNORE_SUFFIX   AV_DICT_IGNORE_SUFFIX
+#define AV_METADATA_DONT_STRDUP_KEY AV_DICT_DONT_STRDUP_KEY
+#define AV_METADATA_DONT_STRDUP_VAL AV_DICT_DONT_STRDUP_VAL
+#define AV_METADATA_DONT_OVERWRITE  AV_DICT_DONT_OVERWRITE
+
+typedef attribute_deprecated AVDictionary AVMetadata;
+typedef attribute_deprecated AVDictionaryEntry  AVMetadataTag;
+
+typedef struct AVMetadataConv AVMetadataConv;
+
+/**
+ * Get a metadata element with matching key.
+ *
+ * @param prev Set to the previous matching element to find the next.
+ *             If set to NULL the first matching element is returned.
+ * @param flags Allows case as well as suffix-insensitive comparisons.
+ * @return Found tag or NULL, changing key or value leads to undefined behavior.
+ */
+attribute_deprecated AVDictionaryEntry *
+av_metadata_get(AVDictionary *m, const char *key, const AVDictionaryEntry *prev, int flags);
+
+/**
+ * Set the given tag in *pm, overwriting an existing tag.
+ *
+ * @param pm pointer to a pointer to a metadata struct. If *pm is NULL
+ * a metadata struct is allocated and put in *pm.
+ * @param key tag key to add to *pm (will be av_strduped depending on flags)
+ * @param value tag value to add to *pm (will be av_strduped depending on flags).
+ *        Passing a NULL value will cause an existing tag to be deleted.
+ * @return >= 0 on success otherwise an error code <0
+ */
+attribute_deprecated int av_metadata_set2(AVDictionary **pm, const char *key, const char *value, int flags);
+
+/**
+ * This function is provided for compatibility reason and currently does nothing.
+ */
+attribute_deprecated void av_metadata_conv(struct AVFormatContext *ctx, const AVMetadataConv *d_conv,
+                                                                        const AVMetadataConv *s_conv);
+
+/**
+ * Copy metadata from one AVDictionary struct into another.
+ * @param dst pointer to a pointer to a AVDictionary struct. If *dst is NULL,
+ *            this function will allocate a struct for you and put it in *dst
+ * @param src pointer to source AVDictionary struct
+ * @param flags flags to use when setting metadata in *dst
+ * @note metadata is read using the AV_DICT_IGNORE_SUFFIX flag
+ */
+attribute_deprecated void av_metadata_copy(AVDictionary **dst, AVDictionary *src, int flags);
+
+/**
+ * Free all the memory allocated for an AVDictionary struct.
+ */
+attribute_deprecated void av_metadata_free(AVDictionary **m);
+/**
+ * @}
+ */
+#endif
+
+
+/* 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
+
+typedef struct AVFormatParameters {
+#if FF_API_FORMAT_PARAMETERS
+    attribute_deprecated AVRational time_base;
+    attribute_deprecated int sample_rate;
+    attribute_deprecated int channels;
+    attribute_deprecated int width;
+    attribute_deprecated int height;
+    attribute_deprecated enum PixelFormat pix_fmt;
+    attribute_deprecated int channel; /**< Used to select DV channel. */
+    attribute_deprecated const char *standard; /**< deprecated, use demuxer-specific options instead. */
+    attribute_deprecated unsigned int mpeg2ts_raw:1;  /**< deprecated, use mpegtsraw demuxer */
+    /**< deprecated, use mpegtsraw demuxer-specific options instead */
+    attribute_deprecated unsigned int mpeg2ts_compute_pcr:1;
+    attribute_deprecated unsigned int initial_pause:1;       /**< Do not begin to play the stream
+                                                                  immediately (RTSP only). */
+    attribute_deprecated unsigned int prealloced_context:1;
+#endif
+} AVFormatParameters;
+
+/// 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 */
+
+/**
+ * @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 */
+    /**
+     * size of private data so that it can be allocated in the wrapper
+     */
+    int priv_data_size;
+    /* output support */
+    enum CodecID audio_codec; /**< default audio codec */
+    enum CodecID video_codec; /**< default video codec */
+    int (*write_header)(struct AVFormatContext *);
+    int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
+    int (*write_trailer)(struct AVFormatContext *);
+    /**
+     * can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_RAWPICTURE,
+     * AVFMT_GLOBALHEADER, AVFMT_NOTIMESTAMPS, AVFMT_VARIABLE_FPS,
+     * AVFMT_NODIMENSIONS, AVFMT_NOSTREAMS
+     */
+    int flags;
+    /**
+     * Currently only used to set pixel format if not YUV420P.
+     */
+    int (*set_parameters)(struct AVFormatContext *, AVFormatParameters *);
+    int (*interleave_packet)(struct AVFormatContext *, AVPacket *out,
+                             AVPacket *in, int flush);
+
+    /**
+     * List of supported codec_id-codec_tag pairs, ordered by "better
+     * choice first". The arrays are all terminated by CODEC_ID_NONE.
+     */
+    const struct AVCodecTag * const *codec_tag;
+
+    enum CodecID subtitle_codec; /**< default subtitle codec */
+
+#if FF_API_OLD_METADATA2
+    const AVMetadataConv *metadata_conv;
+#endif
+
+    const AVClass *priv_class; ///< AVClass for the private context
+
+    /**
+     * 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 CodecID id, int std_compliance);
+
+    /* private fields */
+    struct AVOutputFormat *next;
+} 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;
+
+    /**
+     * 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. 'ap' if non-NULL contains
+     * additional parameters. Only used in raw format right
+     * now. 'av_new_stream' should be called to create new streams.
+     */
+    int (*read_header)(struct AVFormatContext *,
+                       AVFormatParameters *ap);
+
+    /**
+     * Read one packet and put it in 'pkt'. pts and flags are also
+     * set. 'av_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);
+
+    /**
+     * 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;
+
+    /**
+     * General purpose read-only value that the format can use.
+     */
+    int value;
+
+    /**
+     * 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 *);
+
+    const struct AVCodecTag * const *codec_tag;
+
+    /**
+     * 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);
+
+#if FF_API_OLD_METADATA2
+    const AVMetadataConv *metadata_conv;
+#endif
+
+    const AVClass *priv_class; ///< AVClass for the private context
+
+    /* private fields */
+    struct AVInputFormat *next;
+} 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 */
+
+/**
+ * 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;
+
+#if FF_API_REORDER_PRIVATE
+    /* internal data used in av_find_stream_info() */
+    int64_t first_dts;
+#endif
+
+    /**
+     * 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;
+#if FF_API_REORDER_PRIVATE
+    int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
+#endif
+#if FF_API_STREAM_COPY
+    /* ffmpeg.c private use */
+    attribute_deprecated int stream_copy; /**< If set, just copy stream. */
+#endif
+    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).
+     */
+    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;
+
+#if FF_API_REORDER_PRIVATE
+    /* 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;
+#endif
+
+    int64_t nb_frames;                 ///< number of frames in this stream if known or 0
+
+    int disposition; /**< AV_DISPOSITION_* bit field */
+
+#if FF_API_REORDER_PRIVATE
+    AVProbeData probe_data;
+#define MAX_REORDER_DELAY 16
+    int64_t pts_buffer[MAX_REORDER_DELAY+1];
+#endif
+
+    /**
+     * sample aspect ratio (0 if unknown)
+     * - encoding: Set by user.
+     * - decoding: Set by libavformat.
+     */
+    AVRational sample_aspect_ratio;
+
+    AVDictionary *metadata;
+
+#if FF_API_REORDER_PRIVATE
+    /* 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, do not read or
+     * write from outside of libav*
+     */
+    struct AVPacketList *last_in_packet_buffer;
+#endif
+
+    /**
+     * Average framerate
+     */
+    AVRational avg_frame_rate;
+
+    /*****************************************************************
+     * 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.
+     *****************************************************************
+     */
+
+    /**
+     * Number of frames that have been demuxed during av_find_stream_info()
+     */
+    int codec_info_nb_frames;
+
+    /**
+     * Stream information 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;
+        int nb_decoded_frames;
+    } *info;
+#if !FF_API_REORDER_PRIVATE
+    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;
+    int64_t first_dts;
+    int64_t cur_dts;
+    int last_IP_duration;
+    int64_t last_IP_pts;
+
+    /**
+     * Number of packets to buffer for codec probing
+     */
+#define MAX_PROBE_PACKETS 2500
+    int probe_packets;
+
+    /**
+     * 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];
+    /* av_read_frame() support */
+    enum AVStreamParseType need_parsing;
+    struct AVCodecParserContext *parser;
+
+    AVIndexEntry *index_entries; /**< Only used if the format does not
+                                    support seeking natively. */
+    int nb_index_entries;
+    unsigned int index_entries_allocated_size;
+
+    int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
+#endif
+} 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;
+
+    /**
+     * 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 */
+    /* 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 */
+#if FF_API_REORDER_PRIVATE
+    /* 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;
+#endif
+
+    /**
+     * 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;
+
+#if FF_API_FILESIZE
+    /**
+     * decoding: total file size, 0 if unknown
+     */
+    attribute_deprecated int64_t file_size;
+#endif
+
+    /**
+     * 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;
+
+#if FF_API_REORDER_PRIVATE
+    /* av_read_frame() support */
+    AVStream *cur_st;
+
+    /* av_seek_frame() support */
+    int64_t data_offset; /**< offset of the first packet */
+#endif
+
+#if FF_API_MUXRATE
+    /**
+     * use mpeg muxer private options instead
+     */
+    attribute_deprecated int mux_rate;
+#endif
+    unsigned int packet_size;
+#if FF_API_PRELOAD
+    attribute_deprecated int preload;
+#endif
+    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
+
+#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;
+
+    /**
+     * 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 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
+
+#if FF_API_REORDER_PRIVATE
+    /**
+     * 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;
+#endif
+
+    AVDictionary *metadata;
+
+#if FF_API_REORDER_PRIVATE
+    /**
+     * 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;
+#endif
+
+    /**
+     * 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;
+
+    /*****************************************************************
+     * 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.
+     *****************************************************************
+     */
+#if !FF_API_REORDER_PRIVATE
+    /**
+     * 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;
+    /**
+     * Remaining size available for raw_packet_buffer, in bytes.
+     */
+#define RAW_PACKET_BUFFER_SIZE 2500000
+    int raw_packet_buffer_remaining_size;
+
+    /**
+     * 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_read_frame() support */
+    AVStream *cur_st;
+
+    /* av_seek_frame() support */
+    int64_t data_offset; /**< offset of the first packet */
+#endif
+} 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);
+
+/**
+ * @}
+ */
+
+
+#if FF_API_GUESS_IMG2_CODEC
+attribute_deprecated enum CodecID av_guess_image2_codec(const char *filename);
+#endif
+
+#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
+
+
+/**
+ * @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);
+
+#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);
+
+#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 "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);
+
+#if FF_API_FORMAT_PARAMETERS
+/**
+ * Free a AVFormatContext allocated by av_open_input_stream.
+ * @param s context to free
+ * @deprecated use av_close_input_file()
+ */
+attribute_deprecated
+void av_close_input_stream(AVFormatContext *s);
+#endif
+
+#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);
+/**
+ * @}
+ */
+
+#if FF_API_NEW_STREAM
+/**
+ * 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
+ */
+attribute_deprecated
+AVStream *av_new_stream(AVFormatContext *s, int id);
+#endif
+
+#if FF_API_SET_PTS_INFO
+/**
+ * @deprecated this function is not supposed to be called outside of lavf
+ */
+attribute_deprecated
+void av_set_pts_info(AVStream *s, int pts_wrap_bits,
+                     unsigned int pts_num, unsigned int pts_den);
+#endif
+
+#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
+
+#if FF_API_SEEK_PUBLIC
+attribute_deprecated
+int av_seek_frame_binary(AVFormatContext *s, int stream_index,
+                         int64_t target_ts, int flags);
+attribute_deprecated
+void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
+attribute_deprecated
+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 ));
+#endif
+
+#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
+
+/**
+ * @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);
+
+#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 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.
+ * 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);
+
+/**
+ * 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);
+
+/**
+ * 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);
+
+/**
+ * @}
+ */
+
+
+/**
+ * @defgroup lavf_misc Utility functions
+ * @ingroup libavf
+ * @{
+ *
+ * Miscelaneous 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, 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);
+
+/**
+ * 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);
+
+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);
+
+#if FF_API_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);
+
+/**
+ * @defgroup riff_fourcc RIFF FourCCs
+ * @{
+ * Get the tables mapping RIFF FourCCs to libavcodec CodecIDs. 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 CodecID id = av_codec_get_id(table, tag);
+ * @endcode
+ */
+/**
+ * @return the table mapping RIFF FourCCs for video to libavcodec CodecID.
+ */
+const struct AVCodecTag *avformat_get_riff_video_tags(void);
+/**
+ * @return the table mapping RIFF FourCCs for audio to CodecID.
+ */
+const struct AVCodecTag *avformat_get_riff_audio_tags(void);
+/**
+ * @}
+ */
+
+/**
+ * @}
+ */
+
+#endif /* AVFORMAT_AVFORMAT_H */
diff --git a/make/stub_includes/libav/libavformat/avio.h b/make/stub_includes/libav/libavformat/avio.h
new file mode 100644
index 000000000..78935d941
--- /dev/null
+++ b/make/stub_includes/libav/libavformat/avio.h
@@ -0,0 +1,688 @@
+/*
+ * 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_AVIO_H
+#define AVFORMAT_AVIO_H
+
+/**
+ * @file
+ * @ingroup lavf_io
+ * Buffered I/O operations
+ */
+
+#include <stdint.h>
+
+#include "libavutil/common.h"
+#include "libavutil/dict.h"
+#include "libavutil/log.h"
+
+#include "libavformat/version.h"
+
+
+#define AVIO_SEEKABLE_NORMAL 0x0001 /**< Seeking works like for a local file */
+
+/**
+ * Callback for checking whether to abort blocking functions.
+ * AVERROR_EXIT is returned in this case by the interrupted
+ * function. During blocking operations, callback is called with
+ * opaque as parameter. If the callback returns 1, the
+ * blocking operation will be aborted.
+ *
+ * No members can be added to this struct without a major bump, if
+ * new elements have been added after this struct in AVFormatContext
+ * or AVIOContext.
+ */
+typedef struct {
+    int (*callback)(void*);
+    void *opaque;
+} AVIOInterruptCB;
+
+/**
+ * Bytestream IO 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(AVIOContext) must not be used outside libav*.
+ *
+ * @note None of the function pointers in AVIOContext should be called
+ *       directly, they should only be set by the client application
+ *       when implementing custom I/O. Normally these are set to the
+ *       function pointers specified in avio_alloc_context()
+ */
+typedef struct {
+#if !FF_API_OLD_AVIO
+    /**
+     * A class for private options.
+     *
+     * If this AVIOContext is created by avio_open2(), av_class is set and
+     * passes the options down to protocols.
+     *
+     * If this AVIOContext is manually allocated, then av_class may be set by
+     * the caller.
+     *
+     * warning -- this field can be NULL, be sure to not pass this AVIOContext
+     * to any av_opt_* functions in that case.
+     */
+    AVClass *av_class;
+#endif
+    unsigned char *buffer;  /**< Start of the buffer. */
+    int buffer_size;        /**< Maximum buffer size */
+    unsigned char *buf_ptr; /**< Current position in the buffer */
+    unsigned char *buf_end; /**< End of the data, may be less than
+                                 buffer+buffer_size if the read function returned
+                                 less data than requested, e.g. for streams where
+                                 no more data has been received yet. */
+    void *opaque;           /**< A private pointer, passed to the read/write/seek/...
+                                 functions. */
+    int (*read_packet)(void *opaque, uint8_t *buf, int buf_size);
+    int (*write_packet)(void *opaque, uint8_t *buf, int buf_size);
+    int64_t (*seek)(void *opaque, int64_t offset, int whence);
+    int64_t pos;            /**< position in the file of the current buffer */
+    int must_flush;         /**< true if the next seek should flush */
+    int eof_reached;        /**< true if eof reached */
+    int write_flag;         /**< true if open for writing */
+#if FF_API_OLD_AVIO
+    attribute_deprecated int is_streamed;
+#endif
+    int max_packet_size;
+    unsigned long checksum;
+    unsigned char *checksum_ptr;
+    unsigned long (*update_checksum)(unsigned long checksum, const uint8_t *buf, unsigned int size);
+    int error;              /**< contains the error code or 0 if no error happened */
+    /**
+     * Pause or resume playback for network streaming protocols - e.g. MMS.
+     */
+    int (*read_pause)(void *opaque, int pause);
+    /**
+     * Seek to a given timestamp in stream with the specified stream_index.
+     * Needed for some network streaming protocols which don't support seeking
+     * to byte position.
+     */
+    int64_t (*read_seek)(void *opaque, int stream_index,
+                         int64_t timestamp, int flags);
+    /**
+     * A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
+     */
+    int seekable;
+} AVIOContext;
+
+/* unbuffered I/O */
+
+#if FF_API_OLD_AVIO
+/**
+ * URL 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(URLContext) must not be used outside libav*.
+ * @deprecated This struct will be made private
+ */
+typedef struct URLContext {
+    const AVClass *av_class; ///< information for av_log(). Set by url_open().
+    struct URLProtocol *prot;
+    int flags;
+    int is_streamed;  /**< true if streamed (no seek possible), default = false */
+    int max_packet_size;  /**< if non zero, the stream is packetized with this max packet size */
+    void *priv_data;
+    char *filename; /**< specified URL */
+    int is_connected;
+    AVIOInterruptCB interrupt_callback;
+} URLContext;
+
+#define URL_PROTOCOL_FLAG_NESTED_SCHEME 1 /*< The protocol name can be the first part of a nested protocol scheme */
+#define URL_PROTOCOL_FLAG_NETWORK       2 /*< The protocol uses network */
+
+/**
+ * @deprecated This struct is to be made private. Use the higher-level
+ *             AVIOContext-based API instead.
+ */
+typedef struct URLProtocol {
+    const char *name;
+    int (*url_open)(URLContext *h, const char *url, int flags);
+    int (*url_read)(URLContext *h, unsigned char *buf, int size);
+    int (*url_write)(URLContext *h, const unsigned char *buf, int size);
+    int64_t (*url_seek)(URLContext *h, int64_t pos, int whence);
+    int (*url_close)(URLContext *h);
+    struct URLProtocol *next;
+    int (*url_read_pause)(URLContext *h, int pause);
+    int64_t (*url_read_seek)(URLContext *h, int stream_index,
+                             int64_t timestamp, int flags);
+    int (*url_get_file_handle)(URLContext *h);
+    int priv_data_size;
+    const AVClass *priv_data_class;
+    int flags;
+    int (*url_check)(URLContext *h, int mask);
+} URLProtocol;
+
+typedef struct URLPollEntry {
+    URLContext *handle;
+    int events;
+    int revents;
+} URLPollEntry;
+
+/* not implemented */
+attribute_deprecated int url_poll(URLPollEntry *poll_table, int n, int timeout);
+
+/**
+ * @name URL open modes
+ * The flags argument to url_open and cosins must be one of the following
+ * constants, optionally ORed with other flags.
+ * @{
+ */
+#define URL_RDONLY 1  /**< read-only */
+#define URL_WRONLY 2  /**< write-only */
+#define URL_RDWR   (URL_RDONLY|URL_WRONLY)  /**< read-write */
+/**
+ * @}
+ */
+
+/**
+ * Use non-blocking mode.
+ * If this flag is set, operations on the context will return
+ * AVERROR(EAGAIN) if they can not be performed immediately.
+ * If this flag is not set, operations on the context will never return
+ * AVERROR(EAGAIN).
+ * Note that this flag does not affect the opening/connecting of the
+ * context. Connecting a protocol will always block if necessary (e.g. on
+ * network protocols) but never hang (e.g. on busy devices).
+ * Warning: non-blocking protocols is work-in-progress; this flag may be
+ * silently ignored.
+ */
+#define URL_FLAG_NONBLOCK 8
+
+typedef int URLInterruptCB(void);
+extern URLInterruptCB *url_interrupt_cb;
+
+/**
+ * @defgroup old_url_funcs Old url_* functions
+ * The following functions are deprecated. Use the buffered API based on #AVIOContext instead.
+ * @{
+ * @ingroup lavf_io
+ */
+attribute_deprecated int url_open_protocol (URLContext **puc, struct URLProtocol *up,
+                                            const char *url, int flags);
+attribute_deprecated int url_alloc(URLContext **h, const char *url, int flags);
+attribute_deprecated int url_connect(URLContext *h);
+attribute_deprecated int url_open(URLContext **h, const char *url, int flags);
+attribute_deprecated int url_read(URLContext *h, unsigned char *buf, int size);
+attribute_deprecated int url_read_complete(URLContext *h, unsigned char *buf, int size);
+attribute_deprecated int url_write(URLContext *h, const unsigned char *buf, int size);
+attribute_deprecated int64_t url_seek(URLContext *h, int64_t pos, int whence);
+attribute_deprecated int url_close(URLContext *h);
+attribute_deprecated int64_t url_filesize(URLContext *h);
+attribute_deprecated int url_get_file_handle(URLContext *h);
+attribute_deprecated int url_get_max_packet_size(URLContext *h);
+attribute_deprecated void url_get_filename(URLContext *h, char *buf, int buf_size);
+attribute_deprecated int av_url_read_pause(URLContext *h, int pause);
+attribute_deprecated int64_t av_url_read_seek(URLContext *h, int stream_index,
+                                              int64_t timestamp, int flags);
+attribute_deprecated void url_set_interrupt_cb(int (*interrupt_cb)(void));
+/**
+ * If protocol is NULL, returns the first registered protocol,
+ * if protocol is non-NULL, returns the next registered protocol after protocol,
+ * or NULL if protocol is the last one.
+ */
+attribute_deprecated URLProtocol *av_protocol_next(URLProtocol *p);
+/**
+ * Register the URLProtocol protocol.
+ *
+ * @param size the size of the URLProtocol struct referenced
+ */
+attribute_deprecated int av_register_protocol2(URLProtocol *protocol, int size);
+/**
+ * @}
+ */
+
+
+typedef attribute_deprecated AVIOContext ByteIOContext;
+
+attribute_deprecated int init_put_byte(AVIOContext *s,
+                  unsigned char *buffer,
+                  int buffer_size,
+                  int write_flag,
+                  void *opaque,
+                  int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
+                  int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
+                  int64_t (*seek)(void *opaque, int64_t offset, int whence));
+attribute_deprecated AVIOContext *av_alloc_put_byte(
+                  unsigned char *buffer,
+                  int buffer_size,
+                  int write_flag,
+                  void *opaque,
+                  int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
+                  int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
+                  int64_t (*seek)(void *opaque, int64_t offset, int whence));
+
+/**
+ * @defgroup old_avio_funcs Old put_/get_*() functions
+ * The following functions are deprecated. Use the "avio_"-prefixed functions instead.
+ * @{
+ * @ingroup lavf_io
+ */
+attribute_deprecated int          get_buffer(AVIOContext *s, unsigned char *buf, int size);
+attribute_deprecated int          get_partial_buffer(AVIOContext *s, unsigned char *buf, int size);
+attribute_deprecated int          get_byte(AVIOContext *s);
+attribute_deprecated unsigned int get_le16(AVIOContext *s);
+attribute_deprecated unsigned int get_le24(AVIOContext *s);
+attribute_deprecated unsigned int get_le32(AVIOContext *s);
+attribute_deprecated uint64_t     get_le64(AVIOContext *s);
+attribute_deprecated unsigned int get_be16(AVIOContext *s);
+attribute_deprecated unsigned int get_be24(AVIOContext *s);
+attribute_deprecated unsigned int get_be32(AVIOContext *s);
+attribute_deprecated uint64_t     get_be64(AVIOContext *s);
+
+attribute_deprecated void         put_byte(AVIOContext *s, int b);
+attribute_deprecated void         put_nbyte(AVIOContext *s, int b, int count);
+attribute_deprecated void         put_buffer(AVIOContext *s, const unsigned char *buf, int size);
+attribute_deprecated void         put_le64(AVIOContext *s, uint64_t val);
+attribute_deprecated void         put_be64(AVIOContext *s, uint64_t val);
+attribute_deprecated void         put_le32(AVIOContext *s, unsigned int val);
+attribute_deprecated void         put_be32(AVIOContext *s, unsigned int val);
+attribute_deprecated void         put_le24(AVIOContext *s, unsigned int val);
+attribute_deprecated void         put_be24(AVIOContext *s, unsigned int val);
+attribute_deprecated void         put_le16(AVIOContext *s, unsigned int val);
+attribute_deprecated void         put_be16(AVIOContext *s, unsigned int val);
+attribute_deprecated void         put_tag(AVIOContext *s, const char *tag);
+/**
+ * @}
+ */
+
+attribute_deprecated int     av_url_read_fpause(AVIOContext *h,    int pause);
+attribute_deprecated int64_t av_url_read_fseek (AVIOContext *h,    int stream_index,
+                                                int64_t timestamp, int flags);
+
+/**
+ * @defgroup old_url_f_funcs Old url_f* functions
+ * The following functions are deprecated, use the "avio_"-prefixed functions instead.
+ * @{
+ * @ingroup lavf_io
+ */
+attribute_deprecated int url_fopen( AVIOContext **s, const char *url, int flags);
+attribute_deprecated int url_fclose(AVIOContext *s);
+attribute_deprecated int64_t url_fseek(AVIOContext *s, int64_t offset, int whence);
+attribute_deprecated int url_fskip(AVIOContext *s, int64_t offset);
+attribute_deprecated int64_t url_ftell(AVIOContext *s);
+attribute_deprecated int64_t url_fsize(AVIOContext *s);
+#define URL_EOF (-1)
+attribute_deprecated int url_fgetc(AVIOContext *s);
+attribute_deprecated int url_setbufsize(AVIOContext *s, int buf_size);
+attribute_deprecated int url_fprintf(AVIOContext *s, const char *fmt, ...) av_printf_format(2, 3);
+attribute_deprecated void put_flush_packet(AVIOContext *s);
+attribute_deprecated int url_open_dyn_buf(AVIOContext **s);
+attribute_deprecated int url_open_dyn_packet_buf(AVIOContext **s, int max_packet_size);
+attribute_deprecated int url_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer);
+attribute_deprecated int url_fdopen(AVIOContext **s, URLContext *h);
+/**
+ * @}
+ */
+
+/**
+ * @deprecated use AVIOContext.eof_reached
+ */
+attribute_deprecated int url_feof(AVIOContext *s);
+attribute_deprecated int url_ferror(AVIOContext *s);
+
+attribute_deprecated int udp_set_remote_url(URLContext *h, const char *uri);
+attribute_deprecated int udp_get_local_port(URLContext *h);
+
+attribute_deprecated void init_checksum(AVIOContext *s,
+                   unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
+                   unsigned long checksum);
+attribute_deprecated unsigned long get_checksum(AVIOContext *s);
+attribute_deprecated void put_strz(AVIOContext *s, const char *buf);
+/** @note unlike fgets, the EOL character is not returned and a whole
+    line is parsed. return NULL if first char read was EOF */
+attribute_deprecated char *url_fgets(AVIOContext *s, char *buf, int buf_size);
+/**
+ * @deprecated use avio_get_str instead
+ */
+attribute_deprecated char *get_strz(AVIOContext *s, char *buf, int maxlen);
+/**
+ * @deprecated Use AVIOContext.seekable field directly.
+ */
+attribute_deprecated static inline int url_is_streamed(AVIOContext *s)
+{
+    return !s->seekable;
+}
+attribute_deprecated URLContext *url_fileno(AVIOContext *s);
+
+/**
+ * @deprecated use AVIOContext.max_packet_size directly.
+ */
+attribute_deprecated int url_fget_max_packet_size(AVIOContext *s);
+
+attribute_deprecated int url_open_buf(AVIOContext **s, uint8_t *buf, int buf_size, int flags);
+
+/** return the written or read size */
+attribute_deprecated int url_close_buf(AVIOContext *s);
+
+/**
+ * Return a non-zero value if the resource indicated by url
+ * exists, 0 otherwise.
+ * @deprecated Use avio_check instead.
+ */
+attribute_deprecated int url_exist(const char *url);
+#endif // FF_API_OLD_AVIO
+
+/**
+ * Return AVIO_FLAG_* access flags corresponding to the access permissions
+ * of the resource in url, or a negative value corresponding to an
+ * AVERROR code in case of failure. The returned access flags are
+ * masked by the value in flags.
+ *
+ * @note This function is intrinsically unsafe, in the sense that the
+ * checked resource may change its existence or permission status from
+ * one call to another. Thus you should not trust the returned value,
+ * unless you are sure that no other processes are accessing the
+ * checked resource.
+ */
+int avio_check(const char *url, int flags);
+
+#if FF_API_OLD_INTERRUPT_CB
+/**
+ * The callback is called in blocking functions to test regulary if
+ * asynchronous interruption is needed. AVERROR_EXIT is returned
+ * in this case by the interrupted function. 'NULL' means no interrupt
+ * callback is given.
+ * @deprecated Use interrupt_callback in AVFormatContext/avio_open2
+ *             instead.
+ */
+attribute_deprecated void avio_set_interrupt_cb(int (*interrupt_cb)(void));
+#endif
+
+/**
+ * Allocate and initialize an AVIOContext for buffered I/O. It must be later
+ * freed with av_free().
+ *
+ * @param buffer Memory block for input/output operations via AVIOContext.
+ *        The buffer must be allocated with av_malloc() and friends.
+ * @param buffer_size The buffer size is very important for performance.
+ *        For protocols with fixed blocksize it should be set to this blocksize.
+ *        For others a typical size is a cache page, e.g. 4kb.
+ * @param write_flag Set to 1 if the buffer should be writable, 0 otherwise.
+ * @param opaque An opaque pointer to user-specific data.
+ * @param read_packet  A function for refilling the buffer, may be NULL.
+ * @param write_packet A function for writing the buffer contents, may be NULL.
+ * @param seek A function for seeking to specified byte position, may be NULL.
+ *
+ * @return Allocated AVIOContext or NULL on failure.
+ */
+AVIOContext *avio_alloc_context(
+                  unsigned char *buffer,
+                  int buffer_size,
+                  int write_flag,
+                  void *opaque,
+                  int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
+                  int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
+                  int64_t (*seek)(void *opaque, int64_t offset, int whence));
+
+void avio_w8(AVIOContext *s, int b);
+void avio_write(AVIOContext *s, const unsigned char *buf, int size);
+void avio_wl64(AVIOContext *s, uint64_t val);
+void avio_wb64(AVIOContext *s, uint64_t val);
+void avio_wl32(AVIOContext *s, unsigned int val);
+void avio_wb32(AVIOContext *s, unsigned int val);
+void avio_wl24(AVIOContext *s, unsigned int val);
+void avio_wb24(AVIOContext *s, unsigned int val);
+void avio_wl16(AVIOContext *s, unsigned int val);
+void avio_wb16(AVIOContext *s, unsigned int val);
+
+/**
+ * Write a NULL-terminated string.
+ * @return number of bytes written.
+ */
+int avio_put_str(AVIOContext *s, const char *str);
+
+/**
+ * Convert an UTF-8 string to UTF-16LE and write it.
+ * @return number of bytes written.
+ */
+int avio_put_str16le(AVIOContext *s, const char *str);
+
+/**
+ * Passing this as the "whence" parameter to a seek function causes it to
+ * return the filesize without seeking anywhere. Supporting this is optional.
+ * If it is not supported then the seek function will return <0.
+ */
+#define AVSEEK_SIZE 0x10000
+
+/**
+ * Oring this flag as into the "whence" parameter to a seek function causes it to
+ * seek by any means (like reopening and linear reading) or other normally unreasonble
+ * means that can be extreemly slow.
+ * This may be ignored by the seek code.
+ */
+#define AVSEEK_FORCE 0x20000
+
+/**
+ * fseek() equivalent for AVIOContext.
+ * @return new position or AVERROR.
+ */
+int64_t avio_seek(AVIOContext *s, int64_t offset, int whence);
+
+/**
+ * Skip given number of bytes forward
+ * @return new position or AVERROR.
+ */
+static av_always_inline int64_t avio_skip(AVIOContext *s, int64_t offset)
+{
+    return avio_seek(s, offset, SEEK_CUR);
+}
+
+/**
+ * ftell() equivalent for AVIOContext.
+ * @return position or AVERROR.
+ */
+static av_always_inline int64_t avio_tell(AVIOContext *s)
+{
+    return avio_seek(s, 0, SEEK_CUR);
+}
+
+/**
+ * Get the filesize.
+ * @return filesize or AVERROR
+ */
+int64_t avio_size(AVIOContext *s);
+
+/** @warning currently size is limited */
+int avio_printf(AVIOContext *s, const char *fmt, ...) av_printf_format(2, 3);
+
+void avio_flush(AVIOContext *s);
+
+
+/**
+ * Read size bytes from AVIOContext into buf.
+ * @return number of bytes read or AVERROR
+ */
+int avio_read(AVIOContext *s, unsigned char *buf, int size);
+
+/**
+ * @name Functions for reading from AVIOContext
+ * @{
+ *
+ * @note return 0 if EOF, so you cannot use it if EOF handling is
+ *       necessary
+ */
+int          avio_r8  (AVIOContext *s);
+unsigned int avio_rl16(AVIOContext *s);
+unsigned int avio_rl24(AVIOContext *s);
+unsigned int avio_rl32(AVIOContext *s);
+uint64_t     avio_rl64(AVIOContext *s);
+unsigned int avio_rb16(AVIOContext *s);
+unsigned int avio_rb24(AVIOContext *s);
+unsigned int avio_rb32(AVIOContext *s);
+uint64_t     avio_rb64(AVIOContext *s);
+/**
+ * @}
+ */
+
+/**
+ * Read a string from pb into buf. The reading will terminate when either
+ * a NULL character was encountered, maxlen bytes have been read, or nothing
+ * more can be read from pb. The result is guaranteed to be NULL-terminated, it
+ * will be truncated if buf is too small.
+ * Note that the string is not interpreted or validated in any way, it
+ * might get truncated in the middle of a sequence for multi-byte encodings.
+ *
+ * @return number of bytes read (is always <= maxlen).
+ * If reading ends on EOF or error, the return value will be one more than
+ * bytes actually read.
+ */
+int avio_get_str(AVIOContext *pb, int maxlen, char *buf, int buflen);
+
+/**
+ * Read a UTF-16 string from pb and convert it to UTF-8.
+ * The reading will terminate when either a null or invalid character was
+ * encountered or maxlen bytes have been read.
+ * @return number of bytes read (is always <= maxlen)
+ */
+int avio_get_str16le(AVIOContext *pb, int maxlen, char *buf, int buflen);
+int avio_get_str16be(AVIOContext *pb, int maxlen, char *buf, int buflen);
+
+
+/**
+ * @name URL open modes
+ * The flags argument to avio_open must be one of the following
+ * constants, optionally ORed with other flags.
+ * @{
+ */
+#define AVIO_FLAG_READ  1                                      /**< read-only */
+#define AVIO_FLAG_WRITE 2                                      /**< write-only */
+#define AVIO_FLAG_READ_WRITE (AVIO_FLAG_READ|AVIO_FLAG_WRITE)  /**< read-write pseudo flag */
+/**
+ * @}
+ */
+
+/**
+ * Use non-blocking mode.
+ * If this flag is set, operations on the context will return
+ * AVERROR(EAGAIN) if they can not be performed immediately.
+ * If this flag is not set, operations on the context will never return
+ * AVERROR(EAGAIN).
+ * Note that this flag does not affect the opening/connecting of the
+ * context. Connecting a protocol will always block if necessary (e.g. on
+ * network protocols) but never hang (e.g. on busy devices).
+ * Warning: non-blocking protocols is work-in-progress; this flag may be
+ * silently ignored.
+ */
+#define AVIO_FLAG_NONBLOCK 8
+
+/**
+ * Create and initialize a AVIOContext for accessing the
+ * resource indicated by url.
+ * @note When the resource indicated by url has been opened in
+ * read+write mode, the AVIOContext can be used only for writing.
+ *
+ * @param s Used to return the pointer to the created AVIOContext.
+ * In case of failure the pointed to value is set to NULL.
+ * @param flags flags which control how the resource indicated by url
+ * is to be opened
+ * @return 0 in case of success, a negative value corresponding to an
+ * AVERROR code in case of failure
+ */
+int avio_open(AVIOContext **s, const char *url, int flags);
+
+/**
+ * Create and initialize a AVIOContext for accessing the
+ * resource indicated by url.
+ * @note When the resource indicated by url has been opened in
+ * read+write mode, the AVIOContext can be used only for writing.
+ *
+ * @param s Used to return the pointer to the created AVIOContext.
+ * In case of failure the pointed to value is set to NULL.
+ * @param flags flags which control how the resource indicated by url
+ * is to be opened
+ * @param int_cb an interrupt callback to be used at the protocols level
+ * @param options  A dictionary filled with protocol-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 in case of success, a negative value corresponding to an
+ * AVERROR code in case of failure
+ */
+int avio_open2(AVIOContext **s, const char *url, int flags,
+               const AVIOInterruptCB *int_cb, AVDictionary **options);
+
+/**
+ * Close the resource accessed by the AVIOContext s and free it.
+ * This function can only be used if s was opened by avio_open().
+ *
+ * @return 0 on success, an AVERROR < 0 on error.
+ */
+int avio_close(AVIOContext *s);
+
+/**
+ * Open a write only memory stream.
+ *
+ * @param s new IO context
+ * @return zero if no error.
+ */
+int avio_open_dyn_buf(AVIOContext **s);
+
+/**
+ * Return the written size and a pointer to the buffer. The buffer
+ * must be freed with av_free().
+ * Padding of FF_INPUT_BUFFER_PADDING_SIZE is added to the buffer.
+ *
+ * @param s IO context
+ * @param pbuffer pointer to a byte buffer
+ * @return the length of the byte buffer
+ */
+int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer);
+
+/**
+ * Iterate through names of available protocols.
+ *
+ * @param opaque A private pointer representing current protocol.
+ *        It must be a pointer to NULL on first iteration and will
+ *        be updated by successive calls to avio_enum_protocols.
+ * @param output If set to 1, iterate over output protocols,
+ *               otherwise over input protocols.
+ *
+ * @return A static string containing the name of current protocol or NULL
+ */
+const char *avio_enum_protocols(void **opaque, int output);
+
+/**
+ * Pause and resume playing - only meaningful if using a network streaming
+ * protocol (e.g. MMS).
+ * @param pause 1 for pause, 0 for resume
+ */
+int     avio_pause(AVIOContext *h, int pause);
+
+/**
+ * Seek to a given timestamp relative to some component stream.
+ * Only meaningful if using a network streaming protocol (e.g. MMS.).
+ * @param stream_index The stream index that the timestamp is relative to.
+ *        If stream_index is (-1) the timestamp should be in AV_TIME_BASE
+ *        units from the beginning of the presentation.
+ *        If a stream_index >= 0 is used and the protocol does not support
+ *        seeking based on component streams, the call will fail with ENOTSUP.
+ * @param timestamp timestamp in AVStream.time_base units
+ *        or if there is no stream specified then in AV_TIME_BASE units.
+ * @param flags Optional combination of AVSEEK_FLAG_BACKWARD, AVSEEK_FLAG_BYTE
+ *        and AVSEEK_FLAG_ANY. The protocol may silently ignore
+ *        AVSEEK_FLAG_BACKWARD and AVSEEK_FLAG_ANY, but AVSEEK_FLAG_BYTE will
+ *        fail with ENOTSUP if used and not supported.
+ * @return >= 0 on success
+ * @see AVInputFormat::read_seek
+ */
+int64_t avio_seek_time(AVIOContext *h, int stream_index,
+                       int64_t timestamp, int flags);
+
+#endif /* AVFORMAT_AVIO_H */
diff --git a/make/stub_includes/libav/libavformat/version.h b/make/stub_includes/libav/libavformat/version.h
new file mode 100644
index 000000000..009a60b1a
--- /dev/null
+++ b/make/stub_includes/libav/libavformat/version.h
@@ -0,0 +1,126 @@
+/*
+ * Version macros.
+ *
+ * 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_VERSION_H
+#define AVFORMAT_VERSION_H
+
+/**
+ * @file
+ * @ingroup libavf
+ * Libavformat version macros
+ */
+
+#include "libavutil/avutil.h"
+
+#define LIBAVFORMAT_VERSION_MAJOR 53
+#define LIBAVFORMAT_VERSION_MINOR 21
+#define LIBAVFORMAT_VERSION_MICRO  0
+
+#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
+                                               LIBAVFORMAT_VERSION_MINOR, \
+                                               LIBAVFORMAT_VERSION_MICRO)
+#define LIBAVFORMAT_VERSION     AV_VERSION(LIBAVFORMAT_VERSION_MAJOR,   \
+                                           LIBAVFORMAT_VERSION_MINOR,   \
+                                           LIBAVFORMAT_VERSION_MICRO)
+#define LIBAVFORMAT_BUILD       LIBAVFORMAT_VERSION_INT
+
+#define LIBAVFORMAT_IDENT       "Lavf" AV_STRINGIFY(LIBAVFORMAT_VERSION)
+
+/**
+ * Those FF_API_* defines are not part of public API.
+ * They may change, break or disappear at any time.
+ */
+#ifndef FF_API_OLD_METADATA2
+#define FF_API_OLD_METADATA2           (LIBAVFORMAT_VERSION_MAJOR < 54)
+#endif
+#ifndef FF_API_OLD_AVIO
+#define FF_API_OLD_AVIO                (LIBAVFORMAT_VERSION_MAJOR < 54)
+#endif
+#ifndef FF_API_DUMP_FORMAT
+#define FF_API_DUMP_FORMAT             (LIBAVFORMAT_VERSION_MAJOR < 54)
+#endif
+#ifndef FF_API_PARSE_DATE
+#define FF_API_PARSE_DATE              (LIBAVFORMAT_VERSION_MAJOR < 54)
+#endif
+#ifndef FF_API_FIND_INFO_TAG
+#define FF_API_FIND_INFO_TAG           (LIBAVFORMAT_VERSION_MAJOR < 54)
+#endif
+#ifndef FF_API_PKT_DUMP
+#define FF_API_PKT_DUMP                (LIBAVFORMAT_VERSION_MAJOR < 54)
+#endif
+#ifndef FF_API_GUESS_IMG2_CODEC
+#define FF_API_GUESS_IMG2_CODEC        (LIBAVFORMAT_VERSION_MAJOR < 54)
+#endif
+#ifndef FF_API_SDP_CREATE
+#define FF_API_SDP_CREATE              (LIBAVFORMAT_VERSION_MAJOR < 54)
+#endif
+#ifndef FF_API_FORMAT_PARAMETERS
+#define FF_API_FORMAT_PARAMETERS       (LIBAVFORMAT_VERSION_MAJOR < 54)
+#endif
+#ifndef FF_API_FLAG_RTP_HINT
+#define FF_API_FLAG_RTP_HINT           (LIBAVFORMAT_VERSION_MAJOR < 54)
+#endif
+#ifndef FF_API_AVSTREAM_QUALITY
+#define FF_API_AVSTREAM_QUALITY        (LIBAVFORMAT_VERSION_MAJOR < 54)
+#endif
+#ifndef FF_API_LOOP_INPUT
+#define FF_API_LOOP_INPUT              (LIBAVFORMAT_VERSION_MAJOR < 54)
+#endif
+#ifndef FF_API_LOOP_OUTPUT
+#define FF_API_LOOP_OUTPUT             (LIBAVFORMAT_VERSION_MAJOR < 54)
+#endif
+#ifndef FF_API_TIMESTAMP
+#define FF_API_TIMESTAMP               (LIBAVFORMAT_VERSION_MAJOR < 54)
+#endif
+#ifndef FF_API_FILESIZE
+#define FF_API_FILESIZE                (LIBAVFORMAT_VERSION_MAJOR < 54)
+#endif
+#ifndef FF_API_MUXRATE
+#define FF_API_MUXRATE                 (LIBAVFORMAT_VERSION_MAJOR < 54)
+#endif
+#ifndef FF_API_RTSP_URL_OPTIONS
+#define FF_API_RTSP_URL_OPTIONS        (LIBAVFORMAT_VERSION_MAJOR < 54)
+#endif
+#ifndef FF_API_NEW_STREAM
+#define FF_API_NEW_STREAM              (LIBAVFORMAT_VERSION_MAJOR < 54)
+#endif
+#ifndef FF_API_PRELOAD
+#define FF_API_PRELOAD                 (LIBAVFORMAT_VERSION_MAJOR < 54)
+#endif
+#ifndef FF_API_STREAM_COPY
+#define FF_API_STREAM_COPY             (LIBAVFORMAT_VERSION_MAJOR < 54)
+#endif
+#ifndef FF_API_SEEK_PUBLIC
+#define FF_API_SEEK_PUBLIC             (LIBAVFORMAT_VERSION_MAJOR < 54)
+#endif
+#ifndef FF_API_REORDER_PRIVATE
+#define FF_API_REORDER_PRIVATE         (LIBAVFORMAT_VERSION_MAJOR < 54)
+#endif
+#ifndef FF_API_OLD_INTERRUPT_CB
+#define FF_API_OLD_INTERRUPT_CB        (LIBAVFORMAT_VERSION_MAJOR < 54)
+#endif
+#ifndef FF_API_SET_PTS_INFO
+#define FF_API_SET_PTS_INFO            (LIBAVFORMAT_VERSION_MAJOR < 54)
+#endif
+#ifndef FF_API_CLOSE_INPUT_FILE
+#define FF_API_CLOSE_INPUT_FILE        (LIBAVFORMAT_VERSION_MAJOR < 54)
+#endif
+
+#endif /* AVFORMAT_VERSION_H */