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+(*
+ * copyright (c) 2001 Fabrice Bellard
+ *
+ * This file is part of FFmpeg.
+ *
+ * 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 *)
+
+(*
+ * Min. version: 50.5.0
+ * Max. version: 52.7.0, Revision: 11661, Tue Jan 29 09:25:49 2008 UTC
+ *)
+
+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 *)
+{$ENDIF}
+
+interface
+
+uses
+ avcodec,
+ avutil,
+ avio,
+ rational,
+ UConfig;
+
+const
+ (* Max. supported version by this header *)
+ LIBAVFORMAT_MAX_VERSION_MAJOR = 52;
+ LIBAVFORMAT_MAX_VERSION_MINOR = 7;
+ LIBAVFORMAT_MAX_VERSION_RELEASE = 0;
+ LIBAVFORMAT_MAX_VERSION = (LIBAVFORMAT_MAX_VERSION_MAJOR * VERSION_MAJOR) +
+ (LIBAVFORMAT_MAX_VERSION_MINOR * VERSION_MINOR) +
+ (LIBAVFORMAT_MAX_VERSION_RELEASE * VERSION_RELEASE);
+
+(* Check if linked versions are supported *)
+{$IF (LIBAVFORMAT_VERSION > LIBAVFORMAT_MAX_VERSION)}
+ {$MESSAGE Warn 'Linked version of libavformat may be unsupported!'}
+{$IFEND}
+
+type
+ PAVFile = Pointer;
+
+(* packet functions *)
+
+type
+ PAVPacket = ^TAVPacket;
+ TAVPacket = record
+ pts: int64; ///< presentation time stamp in time_base units
+ dts: int64; ///< decompression time stamp in time_base units
+ data: PByte;
+ size: integer;
+ stream_index: integer;
+ flags: integer;
+ duration: integer; ///< presentation duration in time_base units (0 if not available)
+ destruct: procedure (p: PAVPacket); cdecl;
+ priv: pointer;
+ pos: int64; ///< byte position in stream, -1 if unknown
+ end;
+const
+ PKT_FLAG_KEY = $0001;
+
+procedure av_destruct_packet_nofree (var pkt: TAVPacket);
+ cdecl; external av__format;
+
+(**
+ * Default packet destructor.
+ *)
+procedure av_destruct_packet (var pkt: TAVPacket);
+ cdecl; external av__format;
+
+(**
+ * Initialize optional fields of a packet to default values.
+ *
+ * @param pkt packet
+ *)
+procedure av_init_packet (var pkt: TAVPacket);
+{$IF LIBAVFORMAT_VERSION >= 51012002} // 51.12.2
+ cdecl; external av__format;
+{$IFEND}
+
+(**
+ * Allocate the payload of a packet and initialize its fields to 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: integer): integer;
+ cdecl; external av__format;
+
+(**
+ * Allocate and read the payload of a packet and initialize its fields to default values.
+ *
+ * @param pkt packet
+ * @param size wanted payload size
+ * @return >0 (read size) if OK. AVERROR_xxx otherwise.
+ *)
+function av_get_packet (s: PByteIOContext; var pkt: TAVPacket; size: integer): integer;
+ cdecl; external av__format;
+
+(**
+ * @warning This is a hack - the packet memory allocation stuff is broken. The
+ * packet is allocated if it was not really allocated
+ *)
+function av_dup_packet (pkt: PAVPacket): integer;
+ cdecl; external av__format;
+
+(**
+ * Free a packet
+ *
+ * @param pkt packet to free
+ *)
+procedure av_free_packet (pkt: PAVPacket); inline;
+
+(*************************************************)
+(* fractional numbers for exact pts handling *)
+
+type
+ (**
+ * the exact value of the fractional number is: 'val + num / den'.
+ * num is assumed to be such as 0 <= num < den
+ * @deprecated Use AVRational instead
+ *)
+ PAVFrac = ^TAVFrac;
+ TAVFrac = record
+ val, num, den: int64;
+ end; {deprecated}
+
+(*************************************************)
+(* input/output formats *)
+
+type
+ (* this structure contains the data a format has to probe a file *)
+ TAVProbeData = record
+ filename: pchar;
+ buf: pchar;
+ buf_size: integer;
+ end;
+
+const
+ AVPROBE_SCORE_MAX = 100; ///< max 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 *)
+
+ // 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 pts if missing even if it requires parsing future frames
+ AVFMT_FLAG_IGNIDX = $0002; ///< ignore index
+ AVFMT_FLAG_NONBLOCK = $0004; ///< do not block when reading packets from input
+
+ // used by AVStream
+ MAX_REORDER_DELAY = 4;
+
+ // used by TAVProgram
+ AV_PROGRAM_RUNNING = 1;
+
+type
+ PPAVCodecTag = ^PAVCodecTag;
+ PAVCodecTag = Pointer;
+
+ PPAVFormatContext = ^PAVFormatContext;
+ PAVFormatContext = ^TAVFormatContext;
+
+ PAVFormatParameters = ^TAVFormatParameters;
+
+ PAVOutputFormat = ^TAVOutputFormat;
+ PAVProbeData = ^TAVProbeData;
+
+ PAVInputFormat = ^TAVInputFormat;
+ PAVIndexEntry = ^TAVIndexEntry;
+
+ PAVStream = ^TAVStream;
+ PAVPacketList = ^TAVPacketList;
+
+ PPAVProgram = ^PAVProgram;
+ PAVProgram = ^TAVProgram;
+
+ {$IF LIBAVFORMAT_VERSION < 51006000} // 51.6.0
+ PAVImageFormat = ^TAVImageFormat;
+ PAVImageInfo = ^TAVImageInfo;
+ {$IFEND}
+
+ TAVFormatParameters = record
+ time_base: TAVRational;
+ sample_rate: integer;
+ channels: integer;
+ width: integer;
+ height: integer;
+ pix_fmt: TAVPixelFormat;
+ {$IF LIBAVFORMAT_VERSION < 51006000} // 51.6.0
+ image_format: PAVImageFormat;
+ {$IFEND}
+ channel: integer; (* used to select dv channel *)
+ {$IF LIBAVFORMAT_VERSION_MAJOR < 52}
+ device: pchar; (* video, audio or DV device, if LIBAVFORMAT_VERSION_INT < (52<<16) *)
+ {$IFEND}
+ standard: pchar; (* tv standard, NTSC, PAL, SECAM *)
+ { Delphi does not support bit fields -> use bf_flags instead
+ int mpeg2ts_raw:1; (* force raw MPEG2 transport stream output, if possible *)
+ int mpeg2ts_compute_pcr:1; (* compute exact PCR for each transport
+ stream packet (only meaningful if
+ mpeg2ts_raw is TRUE *)
+ int initial_pause:1; (* do not begin to play the stream
+ immediately (RTSP only) *)
+ int prealloced_context:1;
+ }
+ bf_flags: byte; // 0:mpeg2ts_raw/1:mpeg2ts_compute_pcr/2:initial_pause/3:prealloced_context
+ {$IF LIBAVFORMAT_VERSION_MAJOR < 53}
+ video_codec_id: TCodecID;
+ audio_codec_id: TCodecID;
+ {$IFEND}
+ end;
+
+ TAVOutputFormat = record
+ name: pchar;
+ long_name: pchar;
+ mime_type: pchar;
+ extensions: pchar; (*< comma separated filename extensions *)
+ (* size of private data so that it can be allocated in the wrapper *)
+ priv_data_size: integer;
+ (* output support *)
+ audio_codec: TCodecID; (* default audio codec *)
+ video_codec: TCodecID; (* default video codec *)
+ write_header: function (c: PAVFormatContext): integer; cdecl;
+ write_packet: function (c: PAVFormatContext; pkt: PAVPacket): integer; cdecl;
+ write_trailer: function (c: PAVFormatContext): integer; cdecl;
+ (* can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_GLOBALHEADER *)
+ flags: integer;
+ (* currently only used to set pixel format if not YUV420P *)
+ set_parameters: function (c: PAVFormatContext; f: PAVFormatParameters): integer; cdecl;
+ interleave_packet: function (s: PAVFormatContext; out_: PAVPacket; in_: PAVPacket; flush: integer): integer; cdecl;
+
+ {$IF LIBAVFORMAT_VERSION >= 51008000} // 51.8.0
+ (**
+ * list of supported codec_id-codec_tag pairs, ordered by "better choice first"
+ * the arrays are all CODEC_ID_NONE terminated
+ *)
+ codec_tag: {const} PPAVCodecTag;
+ {$IFEND}
+
+ {$IF LIBAVFORMAT_VERSION >= 51012002} // 51.12.2
+ subtitle_codec: TCodecID; (**< default subtitle codec *)
+ {$IFEND}
+
+ (* private fields *)
+ next: PAVOutputFormat;
+ end;
+
+ TAVInputFormat = record
+ name: pchar;
+ long_name: pchar;
+ (* size of private data so that it can be allocated in the wrapper *)
+ priv_data_size: integer;
+ (**
+ * Tell if a given file has a chance of being parsed by 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): integer; cdecl;
+ (* read the format header and initialize the AVFormatContext
+ structure. Return 0 if OK. 'ap' if non NULL contains
+ additionnal paramters. Only used in raw format right
+ now. 'av_new_stream' should be called to create new streams. *)
+ read_header: function (c: PAVFormatContext; ap: PAVFormatParameters): integer; 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. *)
+ read_packet: function (c: PAVFormatContext; var pkt: TAVPacket): integer; cdecl;
+ (* close the stream. The AVFormatContext and AVStreams are not
+ freed by this function *)
+ read_close: function (c: PAVFormatContext): integer; 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: integer;
+ timestamp: int64; flags: integer): integer; cdecl;
+ (**
+ * gets the next timestamp in stream[stream_index].time_base units.
+ * @return the timestamp or AV_NOPTS_VALUE if an error occured
+ *)
+ read_timestamp: function (s: PAVFormatContext; stream_index: integer;
+ pos: pint64; pos_limit: int64): int64; cdecl;
+ (* can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER *)
+ flags: integer;
+ (* if extensions are defined, then no probe is done. You should
+ usually not use extension format guessing because it is not
+ reliable enough *)
+ extensions: pchar;
+ (* general purpose read only value that the format can use *)
+ value: integer;
+
+ (* start/resume playing - only meaningful if using a network based format (RTSP) *)
+ read_play: function (c: PAVFormatContext): integer; cdecl;
+
+ (* pause playing - only meaningful if using a network based format (RTSP) *)
+ read_pause: function (c: PAVFormatContext): integer; cdecl;
+
+ {$IF LIBAVFORMAT_VERSION >= 51008000} // 51.8.0
+ codec_tag: {const} PPAVCodecTag;
+ {$IFEND}
+
+ (* private fields *)
+ next: PAVInputFormat;
+ end;
+
+ TAVStreamParseType = (
+ AVSTREAM_PARSE_NONE,
+ AVSTREAM_PARSE_FULL, (**< full parsing and repack *)
+ AVSTREAM_PARSE_HEADERS, (**< only parse headers, don't repack *)
+ AVSTREAM_PARSE_TIMESTAMPS (**< full parsing and interpolation of timestamps for frames not starting on packet boundary *)
+ );
+
+ TAVIndexEntry = record
+ pos: int64;
+ timestamp: int64;
+ { Delphi doesn't support bitfields -> use flags_size instead
+ int flags:2;
+ int size:30; //Yeah, trying to keep the size of this small to reduce memory requirements (it is 24 vs 32 byte due to possible 8byte align).
+ }
+ flags_size: cardinal; // 0..1: flags, 2..31: size
+ min_distance: integer; (* min distance between this and the previous keyframe, used to avoid unneeded searching *)
+ end;
+
+ (**
+ * Stream structure.
+ * New fields can be added to the end with minor version bumps.
+ * Removal, reordering and changes to existing fields require a major
+ * version bump.
+ * sizeof(AVStream) must not be used outside libav*.
+ *)
+ TAVStream = record
+ index: integer; (* stream index in AVFormatContext *)
+ id: integer; (* format specific stream id *)
+ codec: PAVCodecContext; (* codec context *)
+ (**
+ * Real base frame rate of the stream.
+ * This is the lowest frame rate with which all timestamps can be
+ * represented accurately (it is the least common multiple of all
+ * frame rates in the stream), Note, this value is just a guess!
+ * For example if the timebase is 1/90000 and all frames have either
+ * approximately 3600 or 1800 timer ticks then r_frame_rate will be 50/1.
+ *)
+ r_frame_rate: TAVRational;
+ priv_data: pointer;
+
+ (* internal data used in av_find_stream_info() *)
+ first_dts: int64;
+ {$IF LIBAVFORMAT_VERSION_MAJOR < 52}
+ codec_info_nb_frames: integer;
+ {$IFEND}
+
+ (** encoding: PTS generation when outputing stream *)
+ pts: TAVFrac;
+ (**
+ * This is the fundamental unit of time (in seconds) in terms
+ * of which frame timestamps are represented. For fixed-fps content,
+ * timebase should be 1/frame rate and timestamp increments should be
+ * identically 1.
+ *)
+ time_base: TAVRational;
+ pts_wrap_bits: integer; (* number of bits in pts (used for wrapping control) *)
+ (* ffmpeg.c private use *)
+ stream_copy: integer; (**< if set, just copy stream *)
+ discard: TAVDiscard; ///< selects which packets can be discarded at will and dont need to be demuxed
+ //FIXME move stuff to a flags field?
+ (* quality, as it has been removed from AVCodecContext and put in AVVideoFrame
+ * MN:dunno if thats the right place, for it *)
+ quality: single;
+ (**
+ * Decoding: pts of the first frame of the stream, in stream time base.
+ * Only set this if you are absolutely 100% sure that the value you set
+ * it to really is the pts of the first frame.
+ * This may be undefined (AV_NOPTS_VALUE).
+ * @note The ASF header does NOT contain a correct start_time the ASF
+ * demuxer must NOT set this.
+ *)
+ start_time: int64;
+ (**
+ * Decoding: duration of the stream, in stream time base.
+ * If a source file does not specify a duration, but does specify
+ * a bitrate, this value will be estimates from bit rate and file size.
+ *)
+ duration: int64;
+
+ language: array [0..3] of char; (* ISO 639 3-letter language code (empty string if undefined) *)
+
+ (* av_read_frame() support *)
+ need_parsing: TAVStreamParseType;
+ parser: PAVCodecParserContext;
+
+ cur_dts: int64;
+ last_IP_duration: integer;
+ last_IP_pts: int64;
+ (* av_seek_frame() support *)
+ index_entries: PAVIndexEntry; (* only used if the format does not support seeking natively *)
+ nb_index_entries: integer;
+ index_entries_allocated_size: cardinal;
+
+ nb_frames: int64; ///< number of frames in this stream if known or 0
+
+ {$IF LIBAVFORMAT_VERSION >= 50006000} // 50.6.0
+ pts_buffer: array [0..MAX_REORDER_DELAY] of int64;
+ {$IFEND}
+
+ {$IF LIBAVFORMAT_VERSION >= 52006000} // 52.6.0
+ filename: PChar; (**< source filename of the stream *)
+ {$IFEND}
+ end;
+
+ (**
+ * format I/O context.
+ * New fields can be added to the end with minor version bumps.
+ * Removal, reordering and changes to existing fields require a major
+ * version bump.
+ * sizeof(AVFormatContext) must not be used outside libav*.
+ *)
+ TAVFormatContext = record
+ av_class: PAVClass; (* set by av_alloc_format_context *)
+ (* can only be iformat or oformat, not both at the same time *)
+ iformat: PAVInputFormat;
+ oformat: PAVOutputFormat;
+ priv_data: pointer;
+
+ {$IF LIBAVFORMAT_VERSION_MAJOR >= 52}
+ pb: PByteIOContext;
+ {$ELSE}
+ pb: TByteIOContext;
+ {$IFEND}
+
+ nb_streams: cardinal;
+ streams: array [0..MAX_STREAMS - 1] of PAVStream;
+ filename: array [0..1023] of char; (* input or output filename *)
+ (* stream info *)
+ timestamp: int64;
+ title: array [0..511] of char;
+ author: array [0..511] of char;
+ copyright: array [0..511] of char;
+ comment: array [0..511] of char;
+ album: array [0..511] of char;
+ year: integer; (* ID3 year, 0 if none *)
+ track: integer; (* track number, 0 if none *)
+ genre: array [0..31] of char; (* ID3 genre *)
+
+ ctx_flags: integer; (* 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: int64;
+ (* decoding: duration of the stream, in AV_TIME_BASE fractional
+ seconds. NEVER set this value directly: it is deduced from the
+ AVStream values. *)
+ duration: int64;
+ (* decoding: total file size. 0 if unknown *)
+ file_size: int64;
+ (* 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: integer;
+
+ (* av_read_frame() support *)
+ cur_st: PAVStream;
+ cur_ptr: pbyte;
+ cur_len: integer;
+ cur_pkt: TAVPacket;
+
+ (* av_seek_frame() support *)
+ data_offset: int64; (* offset of the first packet *)
+ index_built: integer;
+
+ mux_rate: integer;
+ packet_size: integer;
+ preload: integer;
+ max_delay: integer;
+
+ (* number of times to loop output in formats that support it *)
+ loop_output: integer;
+
+ flags: integer;
+ loop_input: integer;
+
+ {$IF LIBAVFORMAT_VERSION >= 50006000} // 50.6.0
+ (* decoding: size of data to probe; encoding unused *)
+ probesize: cardinal;
+ {$IFEND}
+
+ {$IF LIBAVFORMAT_VERSION >= 51009000} // 51.9.0
+ (**
+ * maximum duration in AV_TIME_BASE units over which the input should be analyzed in av_find_stream_info()
+ *)
+ max_analyze_duration: integer;
+
+ key: pbyte;
+ keylen : integer;
+ {$IFEND}
+
+ {$IF LIBAVFORMAT_VERSION >= 51014000} // 51.14.0
+ nb_programs: cardinal;
+ programs: PPAVProgram;
+ {$IFEND}
+
+ {$IF LIBAVFORMAT_VERSION >= 52003000} // 52.3.0
+ (**
+ * Forced video codec_id.
+ * demuxing: set by user
+ *)
+ video_codec_id: TCodecID;
+ (**
+ * Forced audio codec_id.
+ * demuxing: set by user
+ *)
+ audio_codec_id: TCodecID;
+ (**
+ * Forced subtitle codec_id.
+ * demuxing: set by user
+ *)
+ subtitle_codec_id: TCodecID;
+ {$IFEND}
+
+ {$IF LIBAVFORMAT_VERSION >= 52004000} // 52.4.0
+ (**
+ * Maximum amount of memory in bytes to use per stream for the index.
+ * If the needed index exceeds this size entries will be discarded as
+ * needed to maintain a smaller size. This can lead to slower or less
+ * accurate seeking (depends on demuxer).
+ * Demuxers for which a full in memory index is mandatory will ignore
+ * this.
+ * muxing : unused
+ * demuxing: set by user
+ *)
+ max_index_size: cardinal;
+ {$IFEND}
+ 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 : integer;
+ provider_name : PChar; ///< Network name for DVB streams
+ name : PChar; ///< Service name for DVB streams
+ flags : integer;
+ discard : TAVDiscard; ///< selects which program to discard and which to feed to the caller
+ {$IF LIBAVFORMAT_VERSION >= 51016000} // 51.16.0
+ stream_index : PCardinal;
+ nb_stream_indexes : PCardinal;
+ {$IFEND}
+ end;
+
+ TAVPacketList = record
+ pkt: TAVPacket;
+ next: PAVPacketList;
+ end;
+
+{$IF LIBAVFORMAT_VERSION < 51006000} // 51.6.0
+ (* still image support *)
+ PAVInputImageContext = pointer; {deprecated}
+
+ (* still image support *)
+ TAVImageInfo = record
+ pix_fmt: TAVPixelFormat; (* requested pixel format *)
+ width: integer; (* requested width *)
+ height: integer; (* requested height *)
+ interleaved: integer; (* image is interleaved (e.g. interleaved GIF) *)
+ pict: TAVPicture; (* returned allocated image *)
+ end; {deprecated}
+
+ TAVImageFormat = record
+ name: pchar;
+ extensions: pchar;
+ (* tell if a given file has a chance of being parsing by this format *)
+ img_probe: function (d: PAVProbeData): integer; cdecl;
+ (* read a whole image. 'alloc_cb' is called when the image size is
+ known so that the caller can allocate the image. If 'allo_cb'
+ returns non zero, then the parsing is aborted. Return '0' if
+ OK. *)
+ img_read: function (b: PByteIOContext; alloc_cb: pointer; ptr: pointer): integer; cdecl;
+ (* write the image *)
+ supported_pixel_formats: integer; (* mask of supported formats for output *)
+ img_write: function (b: PByteIOContext; i: PAVImageInfo): integer; cdecl;
+ flags: integer;
+ next: PAVImageFormat;
+ end; {deprecated}
+
+procedure av_register_image_format (img_fmt: PAVImageFormat);
+ cdecl; external av__format; deprecated;
+
+function av_probe_image_format (pd: PAVProbeData): PAVImageFormat;
+ cdecl; external av__format; deprecated;
+
+function guess_image_format (filename: pchar): PAVImageFormat;
+ cdecl; external av__format; deprecated;
+
+function av_read_image (pb: PByteIOContext; filename: pchar;
+ fmt: PAVImageFormat;
+ alloc_cb: pointer; opaque: pointer): integer;
+ cdecl; external av__format; deprecated;
+
+function av_write_image(pb: PByteIOContext; fmt: PAVImageFormat; img: PAVImageInfo): integer;
+ cdecl; external av__format; deprecated;
+{$IFEND}
+
+{$IF LIBAVFORMAT_VERSION_MAJOR < 53}
+{
+var
+ first_iformat: PAVInputFormat; external av__format;
+ first_oformat: PAVOutputFormat; external av__format;
+}
+{$IFEND}
+
+{$IF LIBAVFORMAT_VERSION >= 52003000} // 52.3.0
+function av_iformat_next(f: PAVInputFormat): PAVInputFormat;
+ cdecl; external av__format;
+function av_oformat_next(f: PAVOutputFormat): PAVOutputFormat;
+ cdecl; external av__format;
+{$IFEND}
+
+function av_guess_image2_codec({const} filename: PChar): 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: pchar; filename: pchar; mime_type: pchar): PAVOutputFormat;
+ cdecl; external av__format;
+
+function guess_format(short_name: pchar; filename: pchar; mime_type: pchar): PAVOutputFormat;
+ cdecl; external av__format;
+
+(**
+ * Guesses the codec id based upon muxer and filename.
+ *)
+function av_guess_codec(fmt: PAVOutputFormat; short_name: pchar;
+ filename: pchar; mime_type: pchar; 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: pchar; size: integer);
+ cdecl; external av__format;
+
+{$IF LIBAVFORMAT_VERSION >= 51011000} // 51.11.0
+(**
+ * Send a nice hexadecimal dump of a buffer to the log.
+ *
+ * @param avcl A pointer to an arbitrary struct of which the first field is a
+ * pointer to an AVClass struct.
+ * @param level The importance level of the message, lower values signifying
+ * higher importance.
+ * @param buf buffer
+ * @param size buffer size
+ *
+ * @see av_hex_dump, av_pkt_dump, av_pkt_dump_log
+ *)
+procedure av_hex_dump_log(avcl: Pointer; level: integer; buf: PChar; size: integer);
+ cdecl; external av__format;
+{$IFEND}
+
+(**
+ * 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: integer);
+ cdecl; external av__format;
+
+{$IF LIBAVFORMAT_VERSION >= 51011000} // 51.11.0
+(**
+ * Send a nice dump of a packet to the log.
+ *
+ * @param avcl A pointer to an arbitrary struct of which the first field is a
+ * pointer to an AVClass struct.
+ * @param level The importance level of the message, lower values signifying
+ * higher importance.
+ * @param pkt packet to dump
+ * @param dump_payload true if the payload must be displayed too
+ *)
+procedure av_pkt_dump_log(avcl: Pointer; level: integer; pkt: PAVPacket; dump_payload: integer);
+ cdecl; external av__format;
+{$IFEND}
+
+procedure av_register_all ();
+ cdecl; external av__format;
+
+{$IF LIBAVFORMAT_VERSION >= 51008000} // 51.8.0
+(** codec tag <-> codec id *)
+function av_codec_get_id(var tags: PAVCodecTag; tag: cardinal): TCodecID;
+ cdecl; external av__format;
+function av_codec_get_tag(var tags: PAVCodecTag; id: TCodecID): cardinal;
+ cdecl; external av__format;
+{$IFEND}
+
+(* media file input *)
+
+(**
+ * finds AVInputFormat based on input format's short name.
+ *)
+function av_find_input_format (short_name: pchar): 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: integer): PAVInputFormat;
+ cdecl; external av__format;
+
+(**
+ * Allocates 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 (ic_ptr: PAVFormatContext;
+ pb: PByteIOContext; filename: pchar;
+ fmt: PAVInputFormat; ap: PAVFormatParameters): integer;
+ 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: pchar;
+ fmt: PAVInputFormat; buf_size: integer;
+ ap: PAVFormatParameters): integer;
+ 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 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 frame rate in case of mpeg2 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 if error.
+ * @todo Let user decide somehow what information is needed so we do not waste time getting stuff the user does not need.
+ *)
+function av_find_stream_info (ic: PAVFormatContext): integer;
+ 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 if error.
+ *)
+function av_read_packet (s: PAVFormatContext; var pkt: TAVPacket): integer;
+ 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 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.timebase units (and guessed if the format cannot
+ * provided 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 if error or end of file.
+ *)
+function av_read_frame (s: PAVFormatContext; var pkt: TAVPacket): integer; (* CAT#2 *)
+ cdecl; external av__format;
+
+(**
+ * Seek to the key frame 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 there is no stream specified then 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: integer; timestamp: int64; flags: integer): integer;
+ cdecl; external av__format;
+
+(**
+ * start playing a network based stream (e.g. RTSP stream) at the
+ * current position
+ *)
+function av_read_play (s: PAVFormatContext): integer;
+ 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): integer;
+ cdecl; external av__format;
+
+{$IF LIBAVFORMAT_VERSION >= 52003000} // 52.3.0
+(**
+ * Free a AVFormatContext allocated by av_open_input_stream.
+ * @param s context to free
+ *)
+procedure av_close_input_stream(s: PAVFormatContext);
+ cdecl; external av__format;
+{$IFEND}
+
+(**
+ * 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: integer): PAVStream;
+ cdecl; external av__format;
+{$IF LIBAVFORMAT_VERSION >= 51014000} // 51.14.0
+function av_new_program(s: PAVFormatContext; id: integer): PAVProgram;
+ cdecl; external av__format;
+{$IFEND}
+
+(**
+ * 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: integer;
+ pts_num: integer; pts_den: integer);
+ 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
+
+function av_find_default_stream_index (s: PAVFormatContext): integer;
+ cdecl; external av__format;
+
+(**
+ * Gets 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: int64; flags: integer): integer;
+ cdecl; external av__format;
+
+{$IF LIBAVFORMAT_VERSION >= 52004000} // 52.4.0
+(**
+ * Ensures the index uses less memory than the maximum specified in
+ * AVFormatContext.max_index_size, by discarding entries if it grows
+ * too large.
+ * This function is not part of the public API and should only be called
+ * by demuxers.
+ *)
+procedure ff_reduce_index(s: PAVFormatContext; stream_index: integer);
+ cdecl; external av__format;
+{$IFEND}
+
+(**
+ * Add a index entry into a sorted list updateing if it is already there.
+ *
+ * @param timestamp timestamp in the timebase of the given stream
+ *)
+function av_add_index_entry (st: PAVStream; pos: int64; timestamp: int64;
+ distance: integer; flags: integer): integer;
+ cdecl; external av__format;
+
+(**
+ * Does a binary search using av_index_search_timestamp() and AVCodec.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: integer;
+ target_ts: int64; flags: integer): integer;
+ cdecl; external av__format;
+
+
+(**
+ * Updates cur_dts of all streams based on given timestamp and AVStream.
+ *
+ * Stream ref_st unchanged, others set cur_dts in their native timebase
+ * 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: int64);
+ cdecl; external av__format;
+
+{$IF LIBAVFORMAT_VERSION >= 51007000} // 51.7.0
+type
+ TReadTimestampFunc = function (pavfc: PAVFormatContext;
+ arg2: integer; arg3: Pint64; arg4: int64): int64; cdecl;
+
+(**
+ * Does a binary search using read_timestamp().
+ * This is not supposed to be called directly by a user application, but by demuxers.
+ * @param target_ts target timestamp in the time base of the given stream
+ * @param stream_index stream number
+ *)
+function av_gen_search(s: PAVFormatContext; stream_index: integer; target_ts: int64;
+ pos_min: int64; pos_max: int64; pos_limit: int64; ts_min: int64; ts_max: int64;
+ flags: integer; ts_ret: Pint64; read_timestamp: TReadTimestampFunc): int64;
+ cdecl; external av__format;
+{$IFEND}
+
+(* media file output *)
+function av_set_parameters (s: PAVFormatContext; ap: PAVFormatParameters): integer;
+ 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 if error.
+ *)
+function av_write_header (s: PAVFormatContext): integer;
+ 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 if error, = 0 if OK, 1 if end of stream wanted.
+ *)
+function av_write_frame(s: PAVFormatContext; var pkt: TAVPacket): integer;
+ cdecl; external av__format; (* CAT#2 *)
+
+(**
+ * Writes 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 if error, = 0 if OK, 1 if end of stream wanted.
+ *)
+function av_interleaved_write_frame (s: PAVFormatContext; var pkt: TAVPacket): integer;
+ cdecl; external av__format; (* CAT#2 *)
+
+(**
+ * 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 calling av_free_packet() on them is still safe.
+ *
+ * @param s media file handle
+ * @param out the interleaved packet will be output here
+ * @param in 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 occured
+ *)
+function av_interleave_packet_per_dts(s: PAVFormatContext; _out: PAVPacket;
+ pkt: PAVPacket; flush: integer): integer;
+ cdecl; external av__format;
+
+(**
+ * @brief Write the stream trailer to an output media file and
+ * free the file private data.
+ *
+ * @param s media file handle
+ * @return 0 if OK. AVERROR_xxx if error.
+ *)
+function av_write_trailer(s: pAVFormatContext): integer;
+ cdecl; external av__format;
+
+procedure dump_format(ic: PAVFormatContext; index: integer; url: pchar;
+ is_output: integer);
+ cdecl; external av__format;
+
+(**
+ * parses width and height out of string str.
+ * @deprecated Use av_parse_video_frame_size instead.
+ *)
+function parse_image_size(width_ptr: PInteger; height_ptr: PInteger; str: pchar): integer;
+ cdecl; external av__format; deprecated;
+
+(**
+ * Converts frame rate from string to a fraction.
+ * @deprecated Use av_parse_video_frame_rate instead.
+ *)
+function parse_frame_rate (frame_rate: PInteger; frame_rate_base: PInteger; arg: pchar): integer;
+ cdecl; external av__format; deprecated;
+
+(**
+ * Parses \p datestr and returns a corresponding number of microseconds.
+ * @param datestr String representing a date or a duration.
+ * - If a date the syntax is:
+ * @code
+ * [{YYYY-MM-DD|YYYYMMDD}]{T| }{HH[:MM[:SS[.m...]]][Z]|HH[MM[SS[.m...]]][Z]}
+ * @endcode
+ * Time is localtime unless Z is appended, in which case it is
+ * interpreted as UTC.
+ * If the year-month-day part isn't 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 \p datestr cannot be
+ * successfully parsed.
+ * - If a duration the syntax is:
+ * @code
+ * [-]HH[:MM[:SS[.m...]]]
+ * [-]S+[.m...]
+ * @endcode
+ * Returns the number of microseconds contained in a time interval
+ * with the specified duration or INT64_MIN if \p datestr cannot be
+ * successfully parsed.
+ * @param duration Flag which tells how to interpret \p datestr, if
+ * not zero \p datestr is interpreted as a duration, otherwise as a
+ * date.
+ *)
+function parse_date(datestr: pchar; duration: integer): int64;
+ cdecl; external av__format;
+
+function av_gettime (): int64;
+ cdecl; external av__format;
+
+(* ffm specific for ffserver *)
+const
+ FFM_PACKET_SIZE = 4096;
+
+function ffm_read_write_index (fd: integer): int64;
+ cdecl; external av__format;
+
+procedure ffm_write_write_index(fd: integer; pos: int64);
+ cdecl; external av__format;
+
+procedure ffm_set_write_index (s: PAVFormatContext; pos: int64; file_size: int64);
+ cdecl; external av__format;
+
+(**
+ * Attempts 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: pchar; arg_size: integer; tag1: pchar; info: pchar): integer;
+ cdecl; external av__format;
+
+(**
+ * Returns in 'buf' the path with '%d' replaced by 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 if format error.
+ *)
+function av_get_frame_filename(buf: pchar; buf_size: integer;
+ path: pchar; number: integer): integer;
+ cdecl; external av__format
+ {$IF LIBAVFORMAT_VERSION <= 50006000} // 50.6.0
+ name 'get_frame_filename'
+ {$IFEND};
+
+(**
+ * 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: pchar): integer;
+ cdecl; external av__format
+ {$IF LIBAVFORMAT_VERSION <= 50006000} // 50.6.0
+ name 'filename_number_test'
+ {$IFEND};
+
+{$IF LIBAVFORMAT_VERSION >= 51012002} // 51.12.2
+(**
+ * Generate an SDP for an RTP session.
+ *
+ * @param ac array of AVFormatContexts describing the RTP streams. If the
+ * array is composed by only one context, such context can contain
+ * multiple AVStreams (one AVStream per RTP stream). Otherwise,
+ * all the contexts in the array (an AVCodecContext per RTP stream)
+ * must contain only one AVStream
+ * @param n_files number of AVCodecContexts contained in ac
+ * @param buff buffer where the SDP will be stored (must be allocated by
+ * the caller
+ * @param size the size of the buffer
+ * @return 0 if OK. AVERROR_xxx if error.
+ *)
+function avf_sdp_create(ac: PPAVFormatContext; n_files: integer; buff: PChar; size: integer): integer;
+ cdecl; external av__format;
+{$IFEND}
+
+implementation
+
+{$IF LIBAVFORMAT_VERSION < 51012002} // 51.12.2
+procedure av_init_packet (var pkt: TAVPacket);
+begin
+ with pkt do begin
+ pts := AV_NOPTS_VALUE;
+ dts := AV_NOPTS_VALUE;
+ pos := -1;
+ duration := 0;
+ flags := 0;
+ stream_index := 0;
+ destruct := @av_destruct_packet_nofree
+ end
+end;
+{$IFEND}
+
+procedure av_free_packet (pkt: PAVPacket);
+begin
+ if ((pkt <> nil) and (@pkt^.destruct <> nil)) then
+ pkt^.destruct(pkt);
+end;
+
+end.