(*
* copyright (c) 2001 Fabrice Bellard
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* This is a part of Pascal porting of ffmpeg.
* - Originally by Victor Zinetz for Delphi and Free Pascal on Windows.
* - For Mac OS X, some modifications were made by The Creative CAT, denoted as CAT
* in the source codes.
* - Changes and updates by the UltraStar Deluxe Team
*
* Conversion of version 0.7 libavformat/avformat.h
* Min. version: 52.110.0
* Max. version: 52.111.0
*)
unit avformat;
{$IFDEF FPC}
{$MODE DELPHI }
{$PACKENUM 4} (* use 4-byte enums *)
{$PACKRECORDS C} (* C/C++-compatible record packing *)
{$ELSE}
{$MINENUMSIZE 4} (* use 4-byte enums *)
{$ENDIF}
{$I switches.inc} (* for the HasInline define *)
{$IFDEF DARWIN}
{$linklib libavformat}
{$ENDIF}
interface
uses
ctypes,
avcodec,
avio,
avutil,
rational,
SysUtils,
UConfig;
const
(*
* IMPORTANT: This headers are valid for all minor revisions of ffmpeg
* version 0.7x
* This file has been created with the previous ffmpeg headers as a basis
* by removing all unneeded conditionals.
*)
(* Max. supported version by this header *)
LIBAVFORMAT_MAX_VERSION_MAJOR = 52;
LIBAVFORMAT_MAX_VERSION_MINOR = 111;
LIBAVFORMAT_MAX_VERSION_RELEASE = 0;
LIBAVFORMAT_MAX_VERSION = (LIBAVFORMAT_MAX_VERSION_MAJOR * VERSION_MAJOR) +
(LIBAVFORMAT_MAX_VERSION_MINOR * VERSION_MINOR) +
(LIBAVFORMAT_MAX_VERSION_RELEASE * VERSION_RELEASE);
(* Min. supported version by this header *)
LIBAVFORMAT_MIN_VERSION_MAJOR = 52;
LIBAVFORMAT_MIN_VERSION_MINOR = 110;
LIBAVFORMAT_MIN_VERSION_RELEASE = 0;
LIBAVFORMAT_MIN_VERSION = (LIBAVFORMAT_MIN_VERSION_MAJOR * VERSION_MAJOR) +
(LIBAVFORMAT_MIN_VERSION_MINOR * VERSION_MINOR) +
(LIBAVFORMAT_MIN_VERSION_RELEASE * VERSION_RELEASE);
(* Check if linked versions are supported *)
{$IF (LIBAVFORMAT_VERSION < LIBAVFORMAT_MIN_VERSION)}
{$MESSAGE Error 'Linked version of libavformat is too old!'}
{$IFEND}
(* Check if linked versions are supported *)
{$IF (LIBAVFORMAT_VERSION > LIBAVFORMAT_MAX_VERSION)}
// {$MESSAGE Error 'Linked version of libavformat is not yet supported!'}
{$IFEND}
{
const
LIBAVFORMAT_BUILD = LIBAVFORMAT_VERSION_INT;
LIBAVFORMAT_IDENT = 'Lavf' AV_STRINGIFY(LIBAVFORMAT_VERSION);
}
(**
* Return the LIBAVFORMAT_VERSION_INT constant.
*)
function avformat_version(): cuint;
cdecl; external av__format;
(**
* Return the libavformat build-time configuration.
*)
function avformat_configuration(): {const} PansiChar;
cdecl; external av__format;
(**
* Return the libavformat license.
*)
function avformat_license(): {const} PansiChar;
cdecl; external av__format;
type
PAVFile = Pointer;
(*
* Public Metadata API.
* The metadata API allows libavformat to export metadata tags to a client
* application using a sequence of key/value pairs. Like all strings in FFmpeg,
* metadata must be stored as 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:
* 1. 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.
* 2. 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.
* 3. 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.
* a) 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.
* b) 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".
*
* 4. 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:
*
* 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
*)
{$IF FF_API_OLD_METADATA2}
(**
* @defgroup old_metadata Old metadata API
* The following functions are deprecated, use
* their equivalents from libavutil/dict.h instead.
* @
*)
const
AV_METADATA_MATCH_CASE = AV_DICT_MATCH_CASE;
AV_METADATA_IGNORE_SUFFIX = AV_DICT_IGNORE_SUFFIX;
AV_METADATA_DONT_STRDUP_KEY = AV_DICT_DONT_STRDUP_KEY;
AV_METADATA_DONT_STRDUP_VAL = AV_DICT_DONT_STRDUP_VAL;
AV_METADATA_DONT_OVERWRITE = AV_DICT_DONT_OVERWRITE;
type
PAVMetadataTag = ^TAVMetadataTag;
TAVMetadataTag = record
key: PAnsiChar;
value: PAnsiChar;
end;
PAVMetadata = Pointer;
PAVDictionary = PAVMetadata;
PAVDictionaryEntry = PAVMetadata;
(**
* 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.
*)
function av_metadata_get(m: PAVDictionary; key: {const} PAnsiChar;
prev: {const} PAVDictionaryEntry; flags: cint): PAVDictionaryEntry;
cdecl; external av__format;
{$IF FF_API_OLD_METADATA}
(**
* Set the given tag in *pm, overwriting an existing tag.
*
* @param pm pointer to a pointer to a metadata struct. If *pm is NULL
* a metadata struct is allocated and put in *pm.
* @param key tag key to add to *pm (will be av_strduped)
* @param value tag value to add to *pm (will be av_strduped)
* @return >= 0 on success otherwise an error code <0
* @deprecated Use av_metadata_set2() instead.
*)
function av_metadata_set(var pm: PAVMetadata; key: {const} PAnsiChar; value: {const} PAnsiChar): cint;
cdecl; external av__format; deprecated;
{$ENDIF}
(**
* 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
*)
function av_metadata_set2(var pm: PAVDictionary; key: {const} PAnsiChar; value: {const} PAnsiChar; flags: cint): cint;
cdecl; external av__format; deprecated;
(**
* 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
*)
procedure av_metadata_copy(var dst: PAVDictionary; src: PAVDictionary; flags: cint);
cdecl; external av__format; deprecated;
(**
* Free all the memory allocated for an AVDictionary struct.
*)
procedure av_metadata_free(var m: PAVDictionary);
cdecl; external av__format; deprecated;
{$ENDIF}
(* packet functions *)
const
PKT_FLAG_KEY = $0001;
procedure av_destruct_packet_nofree(var pkt: TAVPacket);
cdecl; external av__format;
(**
* Default packet destructor.
*)
procedure av_destruct_packet(var pkt: TAVPacket);
cdecl; external av__format;
(**
* Initialize optional fields of a packet with default values.
*
* @param pkt packet
*)
procedure av_init_packet(var pkt: TAVPacket);
cdecl; external av__format;
(**
* Allocate the payload of a packet and initialize its fields with
* default values.
*
* @param pkt packet
* @param size wanted payload size
* @return 0 if OK, AVERROR_xxx otherwise
*)
function av_new_packet(var pkt: TAVPacket; size: cint): cint;
cdecl; external av__format;
(**
* 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
*)
function av_get_packet(s: PByteIOContext; var pkt: TAVPacket; size: cint): cint;
cdecl; external av__format;
(*************************************************)
(* fractional numbers for exact pts handling *)
type
(**
* The exact value of the fractional number is: 'val + num / den'.
* num is assumed to be 0 <= num < den.
*)
PAVFrac = ^TAVFrac;
TAVFrac = record
val, num, den: cint64;
end;
(*************************************************)
(* input/output formats *)
type
(**
* This structure contains the data a format has to probe a file.
*)
TAVProbeData = record
filename: PAnsiChar;
buf: PByteArray; (**< Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero. *)
buf_size: cint; (**< Size of buf except extra allocated bytes *)
end;
const
AVPROBE_SCORE_MAX = 100; ///< Maximum score, half of that is used for file-extension-based detection
AVPROBE_PADDING_SIZE = 32; ///< extra allocated bytes at the end of the probe buffer
//! Demuxer will use url_fopen, no opened file should be provided by the caller.
AVFMT_NOFILE = $0001;
AVFMT_NEEDNUMBER = $0002; (**< Needs '%d' in filename. *)
AVFMT_SHOW_IDS = $0008; (**< Show format stream IDs numbers. *)
AVFMT_RAWPICTURE = $0020; (**< Format wants AVPicture structure for
raw picture data. *)
AVFMT_GLOBALHEADER = $0040; (**< Format wants global header. *)
AVFMT_NOTIMESTAMPS = $0080; (**< Format does not need / have any timestamps. *)
AVFMT_GENERIC_INDEX = $0100; (**< Use generic index building code. *)
AVFMT_TS_DISCONT = $0200; (**< Format allows timestamp discontinuities. *)
AVFMT_VARIABLE_FPS = $0400; (**< Format allows variable fps. *)
AVFMT_NODIMENSIONS = $0800; (**< Format does not need width/height *)
// used by AVIndexEntry
AVINDEX_KEYFRAME = $0001;
AVFMTCTX_NOHEADER = $0001; (**< signal that no header is present
(streams are added dynamically) *)
MAX_STREAMS = 20;
AVFMT_NOOUTPUTLOOP = -1;
AVFMT_INFINITEOUTPUTLOOP = 0;
AVFMT_FLAG_GENPTS = $0001; ///< Generate missing pts even if it requires parsing future frames.
AVFMT_FLAG_IGNIDX = $0002; ///< Ignore index.
AVFMT_FLAG_NONBLOCK = $0004; ///< Do not block when reading packets from input.
AVFMT_FLAG_IGNDTS = $0008; ///< Ignore DTS on frames that contain both DTS & PTS
AVFMT_FLAG_NOFILLIN = $0010; ///< Do not infer any values from other values, just return what is stored in the container
AVFMT_FLAG_NOPARSE = $0020; ///< 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
AVFMT_FLAG_RTP_HINT = $0040; ///< Add RTP hinting to the output file
// used by AVStream
MAX_REORDER_DELAY = 16;
MAX_PROBE_PACKETS = 2500;
MAX_STD_TIMEBASES = 60*12+5;
// used by TAVProgram
AV_PROGRAM_RUNNING = 1;
AV_DISPOSITION_DEFAULT = $0001;
AV_DISPOSITION_DUB = $0002;
AV_DISPOSITION_ORIGINAL = $0004;
AV_DISPOSITION_COMMENT = $0008;
AV_DISPOSITION_LYRICS = $0010;
AV_DISPOSITION_KARAOKE = $0020;
(**
* 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.
*)
AV_DISPOSITION_FORCED = $0040;
// used by TAVFormatContext.debug
FF_FDEBUG_TS = 0001;
RAW_PACKET_BUFFER_SIZE = 2500000;
type
PPAVCodecTag = ^PAVCodecTag;
PAVCodecTag = Pointer;
PAVFormatParameters = ^TAVFormatParameters;
PAVOutputFormat = ^TAVOutputFormat;
PAVProbeData = ^TAVProbeData;
PAVInputFormat = ^TAVInputFormat;
PAVIndexEntry = ^TAVIndexEntry;
PPAVStream = ^PAVStream;
PAVStream = ^TAVStream;
PAVPacketList = ^TAVPacketList;
PPAVProgram = ^PAVProgram;
PAVProgram = ^TAVProgram;
PPAVFormatContext = ^PAVFormatContext;
PAVFormatContext = ^TAVFormatContext;
(**
* Convert all the metadata sets from ctx according to the source and
* destination conversion tables.
*
* @param d_conv destination tags format conversion table
* @param s_conv source tags format conversion table
*)
PAVMetadataConv = ^TAVMetadataConv;
TAVMetadataConv = record
ctx: PAVFormatContext;
d_conv: {const} PAVMetadataConv;
s_conv: {const} PAVMetadataConv;
end;
PAVChapter = ^TAVChapter;
TAVChapter = record
id: cint; ///< unique ID to identify the chapter
time_base: TAVRational; ///< time base in which the start/end timestamps are specified
start, end_: cint64; ///< chapter start/end time in time_base units
{$IF FF_API_OLD_METADATA}
title: PAnsiChar; ///< chapter title
{$ENDIF}
metadata: PAVDictionary;
end;
TAVChapterArray = array[0..(MaxInt div SizeOf(TAVChapter))-1] of TAVChapter;
PAVChapterArray = ^TAVChapterArray;
TAVFormatParameters = record
time_base: TAVRational;
sample_rate: cint;
channels: cint;
width: cint;
height: cint;
pix_fmt: TAVPixelFormat;
channel: cint; (**< Used to select DV channel. *)
standard: PAnsiChar; (**< TV standard, NTSC, PAL, SECAM *)
{ Delphi does not support bit fields -> use bf_flags instead
unsigned int mpeg2ts_raw:1; (**< Force raw MPEG-2 transport stream output, if possible. *)
unsigned int mpeg2ts_compute_pcr:1; (**< Compute exact PCR for each transport
stream packet (only meaningful if
mpeg2ts_raw is TRUE). *)
unsigned int initial_pause:1; (**< Do not begin to play the stream
immediately (RTSP only). *)
unsigned int prealloced_context:1;
}
bf_flags: byte; // 0:mpeg2ts_raw/1:mpeg2ts_compute_pcr/2:initial_pause/3:prealloced_context
video_codec_id: TCodecID;
audio_codec_id: TCodecID;
end;
TAVOutputFormat = record
name: PAnsiChar;
(**
* 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.
*)
long_name: PAnsiChar;
mime_type: PAnsiChar;
extensions: PAnsiChar; (**< comma-separated filename extensions *)
(**
* size of private data so that it can be allocated in the wrapper
*)
priv_data_size: cint;
(* output support *)
audio_codec: TCodecID; (**< default audio codec *)
video_codec: TCodecID; (**< default video codec *)
write_header: function (c: PAVFormatContext): cint; cdecl;
write_packet: function (c: PAVFormatContext; pkt: PAVPacket): cint; cdecl;
write_trailer: function (c: PAVFormatContext): cint; cdecl;
(**
* can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_GLOBALHEADER
*)
flags: cint;
(**
* Currently only used to set pixel format if not YUV420P.
*)
set_parameters: function (c: PAVFormatContext; f: PAVFormatParameters): cint; cdecl;
interleave_packet: function (s: PAVFormatContext; out_: PAVPacket;
in_: PAVPacket; flush: cint): cint; cdecl;
(**
* List of supported codec_id-codec_tag pairs, ordered by "better
* choice first". The arrays are all terminated by CODEC_ID_NONE.
*)
codec_tag: {const} PPAVCodecTag;
subtitle_codec: TCodecID; (**< default subtitle codec *)
{const} metadata_conv: PAVMetadataConv;
(* private fields *)
next: PAVOutputFormat;
end;
TAVInputFormat = record
(**
* A comma separated list of short names for the format. New names
* may be appended with a minor bump.
*)
name: PAnsiChar;
(**
* 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.
*)
long_name: PAnsiChar;
(**
* Size of private data so that it can be allocated in the wrapper.
*)
priv_data_size: cint;
(**
* 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.
*)
read_probe: function (p: PAVProbeData): cint; cdecl;
(**
* 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.
*)
read_header: function (c: PAVFormatContext; ap: PAVFormatParameters): cint; cdecl;
(**
* 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.
* @return 0 on success, < 0 on error.
* When returning an error, pkt must not have been allocated
* or must be freed before returning
*)
read_packet: function (c: PAVFormatContext; var pkt: TAVPacket): cint; cdecl;
(**
* Close the stream. The AVFormatContext and AVStreams are not
* freed by this function
*)
read_close: function (c: PAVFormatContext): cint; cdecl;
(**
* 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)
*)
read_seek: function (c: PAVFormatContext; stream_index: cint;
timestamp: cint64; flags: cint): cint; cdecl;
(**
* Gets the next timestamp in stream[stream_index].time_base units.
* @return the timestamp or AV_NOPTS_VALUE if an error occurred
*)
read_timestamp: function (s: PAVFormatContext; stream_index: cint;
pos: pint64; pos_limit: cint64): cint64; cdecl;
(**
* Can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER.
*)
flags: cint;
(**
* If extensions are defined, then no probe is done. You should
* usually not use extension format guessing because it is not
* reliable enough
*)
extensions: PAnsiChar;
(**
* General purpose read-only value that the format can use.
*)
value: cint;
(**
* Start/resume playing - only meaningful if using a network-based format
* (RTSP).
*)
read_play: function (c: PAVFormatContext): cint; cdecl;
(**
* Pause playing - only meaningful if using a network-based format
* (RTSP).
*)
read_pause: function (c: PAVFormatContext): cint; cdecl;
codec_tag: {const} PPAVCodecTag;
(**
* 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.
*)
read_seek2: function (s: PAVFormatContext;
stream_index: cint;
min_ts: cint64;
ts: cint64;
max_ts: cint64;
flags: cint): cint; cdecl;
{const} metadata_conv: PAVMetadataConv;
(* private fields *)
next: PAVInputFormat;
end;
TAVStreamParseType = (
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 *)
);
TAVIndexEntry = record
pos: cint64;
timestamp: cint64;
{ Delphi doesn't support bitfields -> use flags_size instead
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).
}
flags_size: cint; // 0..1: flags, 2..31: size
min_distance: cint; (**< Minimum distance between this and the previous keyframe, used to avoid unneeded searching. *)
end;
(**
* 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*.
*)
TAVStream = record
index: cint; (**< stream index in AVFormatContext *)
id: cint; (**< format-specific stream ID *)
codec: PAVCodecContext; (**< 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.
*)
r_frame_rate: TAVRational;
priv_data: pointer;
(* internal data used in av_find_stream_info() *)
first_dts: cint64;
(**
* encoding: pts generation when outputting stream
*)
pts: TAVFrac;
(**
* 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.
*)
time_base: TAVRational;
pts_wrap_bits: cint; (* number of bits in pts (used for wrapping control) *)
(* ffmpeg.c private use *)
stream_copy: cint; (**< If set, just copy stream. *)
discard: TAVDiscard; ///< Selects which packets can be discarded at will and do not need to be demuxed.
//FIXME move stuff to a flags field?
(**
* Quality, as it has been removed from AVCodecContext and put in AVVideoFrame.
* MN:dunno if thats the right place, for it
*)
quality: cfloat;
(**
* Decoding: pts of the first frame of the stream, in stream time base.
* Only set this if you are absolutely 100% sure that the value you set
* it to really is the pts of the first frame.
* This may be undefined (AV_NOPTS_VALUE).
* @note The ASF header does NOT contain a correct start_time the ASF
* demuxer must NOT set this.
*)
start_time: cint64;
(**
* 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.
*)
duration: cint64;
{$IF FF_API_OLD_METADATA}
language: array [0..3] of PAnsiChar; (**< ISO 639-2/B 3-letter language code (empty string if undefined) *)
{$ENDIF}
(* av_read_frame() support *)
need_parsing: TAVStreamParseType;
parser: PAVCodecParserContext;
cur_dts: cint64;
last_IP_duration: cint;
last_IP_pts: cint64;
(* av_seek_frame() support *)
index_entries: PAVIndexEntry; (**< Only used if the format does not
support seeking natively. *)
nb_index_entries: cint;
index_entries_allocated_size: cuint;
nb_frames: cint64; ///< number of frames in this stream if known or 0
unused: array [0..4] of cint64;
{$IF FF_API_OLD_METADATA}
filename: PAnsiChar; (**< source filename of the stream *)
{$ENDIF}
disposition: cint; (**< AV_DISPOSITION_* bitfield *)
probe_data: TAVProbeData;
pts_buffer: array [0..MAX_REORDER_DELAY] of cint64;
(**
* sample aspect ratio (0 if unknown)
* - encoding: Set by user.
* - decoding: Set by libavformat.
*)
sample_aspect_ratio: TAVRational;
metadata: PAVMetadata;
{* Intended mostly for av_read_frame() support. Not supposed to be used by *}
{* external applications; try to use something else if at all possible. *}
cur_ptr: {const} PCuint8;
cur_len: cint;
cur_pkt: TAVPacket;
// 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.
*)
reference_dts: cint64;
(**
* Number of packets to buffer for codec probing
* NOT PART OF PUBLIC API
*)
probe_packets: cint;
(**
* last packet in packet_buffer for this stream when muxing.
* used internally, NOT PART OF PUBLIC API, dont read or write from outside of libav*
*)
last_in_packet_buffer: PAVPacketList;
(**
* Average framerate
*)
avg_frame_rate: TAVRational;
(**
* Number of frames that have been demuxed during av_find_stream_info()
*)
codec_info_nb_frames: cint;
(**
* Stream Identifier
* This is the MPEG-TS stream identifier +1
* 0 means unknown
*)
stream_identifier: cint;
(**
* Stream informations used internally by av_find_stream_info()
*)
info: pointer;
{
record
last_dts: cint64;
duration_gcd: cint64;
duration_count: cint;
duration_error: array[0..MAX_STD_TIMEBASES-1] of cdouble;
codec_info_duration: cint64;
end;
}
(**
* flag to indicate that probing is requested
* NOT PART OF PUBLIC API
*)
request_probe: cint;
end;
(**
* 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*.
*)
TAVFormatContext = record
av_class: PAVClass; (**< Set by avformat_alloc_context. *)
(* Can only be iformat or oformat, not both at the same time. *)
iformat: PAVInputFormat;
oformat: PAVOutputFormat;
priv_data: pointer;
pb: PByteIOContext;
nb_streams: cuint;
{$IF FF_API_MAX_STREAMS}
streams: array [0..MAX_STREAMS - 1] of PAVStream;
{$ELSE}
streams: PPAVStream;
{$ENDIF}
filename: array [0..1023] of AnsiChar; (* input or output filename *)
(* stream info *)
timestamp: cint64;
{$IF FF_API_OLD_METADATA}
title: array [0..511] of AnsiChar;
author: array [0..511] of AnsiChar;
copyright: array [0..511] of AnsiChar;
comment: array [0..511] of AnsiChar;
album: array [0..511] of AnsiChar;
year: cint; (**< ID3 year, 0 if none *)
track: cint; (**< track number, 0 if none *)
genre: array [0..31] of AnsiChar; (**< ID3 genre *)
{$ENDIF}
ctx_flags: cint; (**< Format-specific flags, see AVFMTCTX_xx *)
(* private data for pts handling (do not modify directly). *)
(**
* This buffer is only needed when packets were already buffered but
* not decoded, for example to get the codec parameters in MPEG
* streams.
*)
packet_buffer: PAVPacketList;
(**
* 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.
*)
start_time: cint64;
(**
* Decoding: duration of the stream, in AV_TIME_BASE fractional
* seconds. Only set this value if you know none of the individual stream
* durations and also dont set any of them. This is deduced from the
* AVStream values if not set.
*)
duration: cint64;
(**
* decoding: total file size, 0 if unknown
*)
file_size: cint64;
(**
* Decoding: total stream bitrate in bit/s, 0 if not
* available. Never set it directly if the file_size and the
* duration are known as ffmpeg can compute it automatically.
*)
bit_rate: cint;
(* av_read_frame() support *)
cur_st: PAVStream;
cur_ptr_deprecated: pbyte;
cur_len_deprecated: cint;
cur_pkt_deprecated: TAVPacket;
(* av_seek_frame() support *)
data_offset: cint64; (**< offset of the first packet *)
index_built: cint;
mux_rate: cint;
packet_size: cuint;
preload: cint;
max_delay: cint;
(**
* number of times to loop output in formats that support it
*)
loop_output: cint;
flags: cint;
loop_input: cint;
(**
* decoding: size of data to probe; encoding: unused.
*)
probesize: cuint;
(**
* Maximum time (in AV_TIME_BASE units) during which the input should
* be analyzed in av_find_stream_info().
*)
max_analyze_duration: cint;
key: pbyte;
keylen : cint;
nb_programs: cuint;
programs: PPAVProgram;
(**
* Forced video codec_id.
* Demuxing: Set by user.
*)
video_codec_id: TCodecID;
(**
* Forced audio codec_id.
* Demuxing: Set by user.
*)
audio_codec_id: TCodecID;
(**
* Forced subtitle codec_id.
* Demuxing: Set by user.
*)
subtitle_codec_id: TCodecID;
(**
* 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
*)
max_index_size: cuint;
(**
* Maximum amount of memory in bytes to use for buffering frames
* obtained from realtime capture devices.
*)
max_picture_buffer: cuint;
nb_chapters: cuint;
chapters: PAVChapterArray;
(**
* Flags to enable debugging.
*)
debug: cint;
(**
* 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.
*)
raw_packet_buffer: PAVPacketList;
raw_packet_buffer_end: PAVPacketList;
packet_buffer_end: PAVPacketList;
metadata: PAVMetadata;
(**
* Remaining size available for raw_packet_buffer, in bytes.
* NOT PART OF PUBLIC API
*)
raw_packet_buffer_remaining_size: cint;
(**
* 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.
*)
start_time_realtime: cint64;
end;
(**
* 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*.
*)
TAVProgram = record
id : cint;
{$IF FF_API_OLD_METADATA}
provider_name : PAnsiChar; ///< network name for DVB streams
name : PAnsiChar; ///< service name for DVB streams
{$ENDIF}
flags : cint;
discard : TAVDiscard; ///< selects which program to discard and which to feed to the caller
stream_index : PCardinal;
nb_stream_indexes : PCardinal;
metadata : PAVMetadata;
end;
TAVPacketList = record
pkt: TAVPacket;
next: PAVPacketList;
end;
(**
* Convert all the metadata sets from ctx according to the source and
* destination conversion tables. If one of the tables is NULL, then
* tags are converted to/from ffmpeg generic tag names.
*
* @param d_conv destination tags format conversion table
* @param s_conv source tags format conversion table
*)
procedure av_metadata_conv(ctx: PAVFormatContext; {const} d_conv: PAVMetadataConv;
{const} s_conv: PAVMetadataConv);
cdecl; external av__format;
{
var
first_iformat: PAVInputFormat; external av__format;
first_oformat: PAVOutputFormat; external av__format;
}
(**
* 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.
*)
function av_iformat_next(f: PAVInputFormat): PAVInputFormat;
cdecl; external av__format;
(**
* If f is NULL, returns the first registered output format,
* if f is non-NULL, returns the next registered input format after f
* or NULL if f is the last one.
*)
function av_oformat_next(f: PAVOutputFormat): PAVOutputFormat;
cdecl; external av__format;
function av_guess_image2_codec(filename: {const} PAnsiChar): TCodecID;
cdecl; external av__format;
(* XXX: Use automatic init with either ELF sections or C file parser *)
(* modules. *)
(* utils.c *)
procedure av_register_input_format(format: PAVInputFormat);
cdecl; external av__format;
procedure av_register_output_format(format: PAVOutputFormat);
cdecl; external av__format;
function guess_stream_format(short_name: PAnsiChar;
filename: PAnsiChar;
mime_type: PAnsiChar): PAVOutputFormat;
cdecl; external av__format; deprecated;
(**
* 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
*)
(**
* @deprecated Use av_guess_format() instead.
*)
function guess_format(short_name: PAnsiChar;
filename: PAnsiChar;
mime_type: PAnsiChar): PAVOutputFormat;
cdecl; external av__format; deprecated;
function av_guess_format(short_name: PAnsiChar;
filename: PAnsiChar;
mime_type: PAnsiChar): PAVOutputFormat;
cdecl; external av__format;
(**
* Guess the codec ID based upon muxer and filename.
*)
function av_guess_codec(fmt: PAVOutputFormat; short_name: PAnsiChar;
filename: PAnsiChar; mime_type: PAnsiChar;
type_: TCodecType): TCodecID;
cdecl; external av__format;
(**
* 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_dump, av_pkt_dump_log
*)
procedure av_hex_dump(f: PAVFile; buf: PByteArray; size: cint);
cdecl; external av__format;
(**
* 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_dump, av_pkt_dump_log
*)
procedure av_hex_dump_log(avcl: Pointer; level: cint; buf: PByteArray; size: cint);
cdecl; external av__format;
(**
* 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.
*)
procedure av_pkt_dump(f: PAVFile; pkt: PAVPacket; dump_payload: cint);
cdecl; external av__format;
(**
* 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.
*)
procedure av_pkt_dump_log(avcl: Pointer; level: cint; pkt: PAVPacket; dump_payload: cint);
cdecl; external av__format;
(**
* 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()
*)
procedure av_register_all();
cdecl; external av__format;
(**
* 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
*)
function av_codec_get_id(var tags: PAVCodecTag; tag: cuint): TCodecID;
cdecl; external av__format;
(**
* Getsthe 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
*)
function av_codec_get_tag(var tags: PAVCodecTag; id: TCodecID): cuint;
cdecl; external av__format;
(* media file input *)
(**
* Find AVInputFormat based on the short name of the input format.
*)
function av_find_input_format(short_name: PAnsiChar): PAVInputFormat;
cdecl; external av__format;
(**
* Guess file format.
*
* @param is_opened Whether the file is already opened; determines whether
* demuxers with or without AVFMT_NOFILE are probed.
*)
function av_probe_input_format(pd: PAVProbeData; is_opened: cint): PAVInputFormat;
cdecl; external av__format;
(**
* 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.
*)
function av_probe_input_format2(pd: PAVProbeData; is_opened: cint; score_max: PCint): PAVInputFormat;
cdecl; external av__format;
(**
* Allocate all the structures needed to read an input stream.
* This does not open the needed codecs for decoding the stream[s].
*)
function av_open_input_stream(var ic_ptr: PAVFormatContext;
pb: PByteIOContext; filename: PAnsiChar;
fmt: PAVInputFormat; ap: PAVFormatParameters): cint;
cdecl; external av__format;
(**
* 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
*)
function av_open_input_file(var ic_ptr: PAVFormatContext; filename: PAnsiChar;
fmt: PAVInputFormat; buf_size: cint;
ap: PAVFormatParameters): cint;
cdecl; external av__format;
(**
* Allocate an AVFormatContext.
* Can be freed with av_free() but do not forget to free everything you
* explicitly allocated as well!
*)
function avformat_alloc_context(): PAVFormatContext;
cdecl; external av__format;
(**
* @deprecated Use avformat_alloc_context() instead.
*)
function av_alloc_format_context(): PAVFormatContext;
cdecl; external av__format;
(**
* 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.
*)
function av_find_stream_info(ic: PAVFormatContext): cint;
cdecl; external av__format;
(**
* 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
*)
function av_read_packet(s: PAVFormatContext; var pkt: TAVPacket): cint;
cdecl; external av__format;
(**
* Return the next frame of a stream.
*
* 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 cint 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
*)
function av_read_frame(s: PAVFormatContext; var pkt: TAVPacket): cint;
cdecl; external av__format;
(**
* 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
*)
function av_seek_frame(s: PAVFormatContext; stream_index: cint; timestamp: cint64;
flags: cint): cint;
cdecl; external av__format;
(**
* 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 byte 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!
*)
function avformat_seek_file(s: PAVFormatContext;
stream_index: cint;
min_ts: cint64;
ts: cint64;
max_ts: cint64;
flags: cint): cint;
cdecl; external av__format;
(**
* Start playing a network-based stream (e.g. RTSP stream) at the
* current position.
*)
function av_read_play(s: PAVFormatContext): cint;
cdecl; external av__format;
(**
* Pause a network-based stream (e.g. RTSP stream).
*
* Use av_read_play() to resume it.
*)
function av_read_pause(s: PAVFormatContext): cint;
cdecl; external av__format;
(**
* Free a AVFormatContext allocated by av_open_input_stream.
* @param s context to free
*)
procedure av_close_input_stream(s: PAVFormatContext);
cdecl; external av__format;
(**
* Close a media file (but not its codecs).
*
* @param s media file handle
*)
procedure av_close_input_file(s: PAVFormatContext);
cdecl; external av__format;
(**
* 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
*)
function av_new_stream(s: PAVFormatContext; id: cint): PAVStream;
cdecl; external av__format;
function av_new_program(s: PAVFormatContext; id: cint): PAVProgram;
cdecl; external av__format;
(**
* Add a new chapter.
* This function is NOT part of the public API
* and should ONLY be used by demuxers.
*
* @param s media file handle
* @param id unique ID for this chapter
* @param start chapter start time in time_base units
* @param end chapter end time in time_base units
* @param title chapter title
*
* @return AVChapter or NULL on error
*)
function ff_new_chapter(s: PAVFormatContext; id: cint; time_base: TAVRational;
start, end_: cint64; title: {const} PAnsiChar): PAVChapter;
cdecl; external av__format;
(**
* Set the pts for a given stream.
*
* @param s stream
* @param pts_wrap_bits number of bits effectively used by the pts
* (used for wrap control, 33 is the value for MPEG)
* @param pts_num numerator to convert to seconds (MPEG: 1)
* @param pts_den denominator to convert to seconds (MPEG: 90000)
*)
procedure av_set_pts_info(s: PAVStream; pts_wrap_bits: cint;
pts_num: cuint; pts_den: cuint);
cdecl; external av__format;
const
AVSEEK_FLAG_BACKWARD = 1; ///< seek backward
AVSEEK_FLAG_BYTE = 2; ///< seeking based on position in bytes
AVSEEK_FLAG_ANY = 4; ///< seek to any frame, even non-keyframes
AVSEEK_FLAG_FRAME = 8;
function av_find_default_stream_index(s: PAVFormatContext): cint;
cdecl; external av__format;
(**
* 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
*)
function av_index_search_timestamp(st: PAVStream; timestamp: cint64; flags: cint): cint;
cdecl; external av__format;
(**
* Ensure the index uses less memory than the maximum specified in
* AVFormatContext.max_index_size by discarding entries if it grows
* too large.
* This function is not part of the public API and should only be called
* by demuxers.
*)
procedure ff_reduce_index(s: PAVFormatContext; stream_index: cint);
cdecl; external av__format;
(**
* Add an index entry into a sorted list. Update the entry if the list
* already contains it.
*
* @param timestamp timestamp in the timebase of the given stream
*)
function av_add_index_entry(st: PAVStream; pos: cint64; timestamp: cint64;
size: cint; distance: cint; flags: cint): cint;
cdecl; external av__format;
(**
* Perform a binary search using av_index_search_timestamp() and
* AVInputFormat.read_timestamp().
* This is not supposed to be called directly by a user application,
* but by demuxers.
* @param target_ts target timestamp in the time base of the given stream
* @param stream_index stream number
*)
function av_seek_frame_binary(s: PAVFormatContext; stream_index: cint;
target_ts: cint64; flags: cint): cint;
cdecl; external av__format;
(**
* Update cur_dts of all streams based on the given timestamp and AVStream.
*
* Stream ref_st unchanged, others set cur_dts in their native time base.
* Only needed for timestamp wrapping or if (dts not set and pts!=dts).
* @param timestamp new dts expressed in time_base of param ref_st
* @param ref_st reference stream giving time_base of param timestamp
*)
procedure av_update_cur_dts(s: PAVFormatContext; ref_st: PAVStream;
timestamp: cint64);
cdecl; external av__format;
type
TReadTimestampFunc = function (pavfc: PAVFormatContext;
arg2: cint; arg3: Pint64; arg4: cint64): cint64; cdecl;
(**
* Perform a binary search using read_timestamp().
* This is not supposed to be called directly by a user application,
* but by demuxers.
* @param target_ts target timestamp in the time base of the given stream
* @param stream_index stream number
*)
function av_gen_search(s: PAVFormatContext; stream_index: cint;
target_ts: cint64; pos_min: cint64;
pos_max: cint64; pos_limit: cint64;
ts_min: cint64; ts_max: cint64;
flags: cint; ts_ret: Pint64;
read_timestamp: TReadTimestampFunc): cint64;
cdecl; external av__format;
(**
* media file output
*)
function av_set_parameters(s: PAVFormatContext; ap: PAVFormatParameters): cint;
cdecl; external av__format;
(**
* 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
*)
procedure av_url_split(proto: PAnsiChar; proto_size: cint;
authorization: PAnsiChar; authorization_size: cint;
hostname: PAnsiChar; hostname_size: cint;
port_ptr: Pcint;
path: PAnsiChar; path_size: cint;
{const} url: PAnsiChar);
cdecl; external av__format;
(**
* Allocate the stream private data and write the stream header to an
* output media file.
*
* @param s media file handle
* @return 0 if OK, AVERROR_xxx on error
*)
function av_write_header(s: PAVFormatContext): cint;
cdecl; external av__format;
(**
* 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
*)
function av_write_frame(s: PAVFormatContext; var pkt: TAVPacket): cint;
cdecl; external av__format;
(**
* Write a packet to an output media file ensuring correct interleaving.
*
* The packet must contain one audio or video frame.
* If the packets are already correctly interleaved, the application should
* call av_write_frame() instead as it is slightly faster. It is also important
* to keep in mind that completely non-interleaved input will need huge amounts
* of memory to interleave with this, so it is preferable to interleave at the
* demuxer level.
*
* @param s media file handle
* @param pkt The packet, which contains the stream_index, buf/buf_size,
* dts/pts, ...
* @return < 0 on error, = 0 if OK, 1 if end of stream wanted
*)
function av_interleaved_write_frame(s: PAVFormatContext; var pkt: TAVPacket): cint;
cdecl; external av__format;
(**
* 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
*)
function av_interleave_packet_per_dts(s: PAVFormatContext; _out: PAVPacket;
pkt: PAVPacket; flush: cint): cint;
cdecl; external av__format;
(**
* Add packet to AVFormatContext->packet_buffer list, determining its
* interleaved position using compare() function argument.
*
* This function is not part of the public API and should only be called
* by muxers using their own interleave function.
*)
{
procedure ff_interleave_add_packet(s: PAVFormatContext;
pkt: PAVPacket;
compare: function(para1: PAVFormatContext;
para2: PAVPacket;
para3: PAVPacket): cint);
cdecl; external av__format;
}
(**
* 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
*)
function av_write_trailer(s: pAVFormatContext): cint;
cdecl; external av__format;
procedure dump_format(ic: PAVFormatContext; index: cint; url: PAnsiChar;
is_output: cint);
cdecl; external av__format;
(**
* Parse width and height out of string str.
* @deprecated Use av_parse_video_frame_size instead.
*)
function parse_image_size(width_ptr: PCint; height_ptr: PCint;
str: PAnsiChar): cint;
cdecl; external av__format; deprecated;
(**
* Convert framerate from a string to a fraction.
* @deprecated Use av_parse_video_frame_rate instead.
*)
function parse_frame_rate(frame_rate: PCint; frame_rate_base: PCint;
arg: PByteArray): cint;
cdecl; external av__format; deprecated;
(**
* Parse datestr and return a corresponding number of microseconds.
* @param datestr String representing a date or a duration.
* - If a date the syntax is:
* @code
* now|{[{YYYY-MM-DD|YYYYMMDD}[T|t| ]]{{HH[:MM[:SS[.m...]]]}|{HH[MM[SS[.m...]]]}}[Z|z]}
* @endcode
* If the value is "now" it takes the current time.
* Time is localtime unless Z is appended, in which case it is
* interpreted as UTC.
* If the year-month-day part is not specified it takes the current
* year-month-day.
* Returns the number of microseconds since 1st of January, 1970 up to
* the time of the parsed date or INT64_MIN if datestr cannot be
* successfully parsed.
* - If a duration the syntax is:
* @code
* [-]HH[:MM[:SS[.m...]]]
* [-]S+[.m...]
* @endcode
* @return the number of microseconds contained in a time interval
* with the specified duration or INT64_MIN if datestr cannot be
* successfully parsed.
* @param duration Flag which tells how to interpret datestr, if
* not zero datestr is interpreted as a duration, otherwise as a
* date.
*)
function parse_date(datestr: PAnsiChar; duration: cint): cint64;
cdecl; external av__format;
(**
* Get the current time in microseconds.
*)
function av_gettime(): cint64;
cdecl; external av__format;
(* ffm-specific for ffserver *)
const
FFM_PACKET_SIZE = 4096;
function ffm_read_write_index(fd: cint): cint64;
cdecl; external av__format;
function ffm_write_write_index(fd: cint; pos: cint64): cint;
cdecl; external av__format;
procedure ffm_set_write_index(s: PAVFormatContext; pos: cint64; file_size: cint64);
cdecl; external av__format;
(**
* Attempt to find a specific tag in a URL.
*
* syntax: '?tag1=val1&tag2=val2...'. Little URL decoding is done.
* Return 1 if found.
*)
function find_info_tag(arg: PAnsiChar; arg_size: cint; tag1: PAnsiChar; info: PAnsiChar): cint;
cdecl; external av__format;
(**
* 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
*)
function av_get_frame_filename(buf: PAnsiChar; buf_size: cint;
path: PAnsiChar; number: cint): cint;
cdecl; external av__format;
(**
* 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
*)
function av_filename_number_test(filename: PAnsiChar): cint;
cdecl; external av__format;
(**
* 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 buff 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
*)
function avf_sdp_create(ac: PPAVFormatContext; n_files: cint; buff: PByteArray; size: cint): cint;
cdecl; external av__format;
(**
* 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
*)
function av_match_ext(filename: {const} Pchar; extensions: {const} Pchar): cint;
cdecl; external av__format;
implementation
end.
