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+(*
+ * unbuffered io for ffmpeg system
+ * 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 libavformat/avio.h
+ * unbuffered I/O operations
+ * @warning This file has to be considered an internal but installed
+ * header, so it should not be directly included in your projects.
+ *
+ * update to
+ * Max. avformat version: 52.78.3, revision 24841, Thu Aug 26 02:00:00 2010 CET
+ *)
+
+unit avio;
+
+{$IFDEF FPC}
+ {$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}
+
+interface
+
+uses
+ ctypes,
+ avutil,
+ avcodec,
+ SysUtils,
+ UConfig;
+
+(* unbuffered I/O *)
+
+const
+ URL_RDONLY = 0;
+ URL_WRONLY = 1;
+ URL_RDWR = 2;
+
+ (**
+ * Passing this as the "whence" parameter to a seek function causes it to
+ * return the filesize without seeking anywhere. Supporting this is optional.
+ * If it is not supported then the seek function will return <0.
+ *)
+ AVSEEK_SIZE = $10000;
+
+{$IF LIBAVFORMAT_VERSION >= 52056000} // 52.56.0
+ (**
+ * Oring this flag as into the "whence" parameter to a seek function causes it to
+ * seek by any means (like reopening and linear reading) or other normally unreasonble
+ * means that can be extreemly slow.
+ * This may be ignored by the seek code.
+ *)
+ AVSEEK_FORCE = $20000;
+{$IFEND}
+
+type
+ TURLInterruptCB = function (): cint; cdecl;
+
+type
+ PURLProtocol = ^TURLProtocol;
+
+ (**
+ * URL Context.
+ * New fields can be added to the end with minor version bumps.
+ * Removal, reordering and changes to existing fields require a major
+ * version bump.
+ * sizeof(URLContext) must not be used outside libav*.
+ *)
+ PURLContext = ^TURLContext;
+ TURLContext = record
+ {$IF LIBAVFORMAT_VERSION < 52078003} // < 52.78.3
+ av_class: {const} PAVClass; ///< information for av_log(). Set by url_open().
+ {$ELSE}
+ {$IFDEF FF_API_URL_CLASS}
+ av_class: {const} PAVClass; ///< information for av_log(). Set by url_open().
+ {$ENDIF}
+ {$IFEND}
+ prot: PURLProtocol;
+ flags: cint;
+ is_streamed: cint; (**< true if streamed (no seek possible), default = false *)
+ max_packet_size: cint; (**< if non zero, the stream is packetized with this max packet size *)
+ priv_data: pointer;
+ filename: PAnsiChar; (**< specified URL *)
+{$IF LIBAVFORMAT_VERSION >= 52070000} // 52.70.0
+ is_connected: cint;
+{$IFEND}
+ end;
+ PPURLContext = ^PURLContext;
+
+ PURLPollEntry = ^TURLPollEntry;
+ TURLPollEntry = record
+ handle: PURLContext;
+ events: cint;
+ revents: cint;
+ end;
+
+ TURLProtocol = record
+ name: PAnsiChar;
+{$IF LIBAVFORMAT_VERSION < 52047000} // 52.47.0
+ url_open: function (h: PURLContext; filename: {const} PAnsiChar; flags: cint): cint; cdecl;
+{$ELSE}
+ url_open: function (h: PURLContext; url: {const} PAnsiChar; flags: cint): cint; cdecl;
+{$IFEND}
+
+(**
+ * Read up to size bytes from the resource accessed by h, and store
+ * the read bytes in buf.
+ *
+ * @return The number of bytes actually read, or a negative value
+ * corresponding to an AVERROR code in case of error. A value of zero
+ * indicates that it is not possible to read more from the accessed
+ * resource (except if the value of the size argument is also zero).
+ *)
+ url_read: function (h: PURLContext; buf: PByteArray; size: cint): cint; cdecl;
+
+(**
+ * Read as many bytes as possible (up to size), calling the
+ * read function multiple times if necessary.
+ * Will also retry if the read function returns AVERROR(EAGAIN).
+ * This makes special short-read handling in applications
+ * unnecessary, if the return value is < size then it is
+ * certain there was either an error or the end of file was reached.
+ *)
+ url_write: function (h: PURLContext; {const} buf: PByteArray; size: cint): cint; cdecl;
+
+(**
+ * Change the position that will be used by the next read/write
+ * operation on the resource accessed by h.
+ *
+ * @param pos specifies the new position to set
+ * @param whence specifies how pos should be interpreted, it must be
+ * one of SEEK_SET (seek from the beginning), SEEK_CUR (seek from the
+ * current position), SEEK_END (seek from the end), or AVSEEK_SIZE
+ * (return the filesize of the requested resource, pos is ignored).
+ * @return a negative value corresponding to an AVERROR code in case
+ * of failure, or the resulting file position, measured in bytes from
+ * the beginning of the file. You can use this feature together with
+ * SEEK_CUR to read the current file position.
+ *)
+ url_seek: function (h: PURLContext; pos: cint64; whence: cint): cint64; cdecl;
+
+ url_close: function (h: PURLContext): cint; cdecl;
+ next: PURLProtocol;
+ {$IF (LIBAVFORMAT_VERSION >= 52001000) and (LIBAVFORMAT_VERSION < 52004000)} // 52.1.0 .. 52.4.0
+ url_read_play: function (h: PURLContext): cint; cdecl;
+ url_read_pause: function (h: PURLContext): cint; cdecl;
+ {$IFEND}
+ {$IF LIBAVFORMAT_VERSION >= 52004000} // 52.4.0
+ url_read_pause: function (h: PURLContext; pause: cint): cint; cdecl;
+ {$IFEND}
+ {$IF LIBAVFORMAT_VERSION >= 52001000} // 52.1.0
+ url_read_seek: function (h: PURLContext; stream_index: cint;
+ timestamp: cint64; flags: cint): cint64; cdecl;
+ {$IFEND}
+ {$IF LIBAVFORMAT_VERSION >= 52031000} // 52.31.0
+ url_get_file_handle: function (h: PURLContext): cint; cdecl;
+ {$IFEND}
+
+ {$IF LIBAVFORMAT_VERSION >= 52071000} // 52.71.0
+ priv_data_size: cint;
+ {const} priv_data_class: PAVClass;
+ {$IFEND}
+ end;
+
+ (**
+ * Bytestream IO Context.
+ * New fields can be added to the end with minor version bumps.
+ * Removal, reordering and changes to existing fields require a major
+ * version bump.
+ * sizeof(ByteIOContext) must not be used outside libav*.
+ *)
+ PByteIOContext = ^TByteIOContext;
+ TByteIOContext = record
+ buffer: PByteArray;
+ buffer_size: cint;
+ buf_ptr: PByteArray;
+ buf_end: PByteArray;
+ opaque: pointer;
+ read_packet: function (opaque: pointer; buf: PByteArray; buf_size: cint): cint; cdecl;
+ write_packet: function (opaque: pointer; buf: PByteArray; buf_size: cint): cint; cdecl;
+ seek: function (opaque: pointer; offset: cint64; whence: cint): cint64; cdecl;
+ pos: cint64; (* position in the file of the current buffer *)
+ must_flush: cint; (* true if the next seek should flush *)
+ eof_reached: cint; (* true if eof reached *)
+ write_flag: cint; (* true if open for writing *)
+ is_streamed: cint;
+ max_packet_size: cint;
+ checksum: culong;
+ checksum_ptr: PByteArray;
+ update_checksum: function (checksum: culong; buf: {const} PByteArray; size: cuint): culong; cdecl;
+ error: cint; ///< contains the error code or 0 if no error happened
+ {$IF (LIBAVFORMAT_VERSION >= 52001000) and (LIBAVFORMAT_VERSION < 52004000)} // 52.1.0 .. 52.4.0
+ read_play: function(opaque: Pointer): cint; cdecl;
+ read_pause: function(opaque: Pointer): cint; cdecl;
+ {$IFEND}
+ {$IF LIBAVFORMAT_VERSION >= 52004000} // 52.4.0
+ read_pause: function(opaque: Pointer; pause: cint): cint; cdecl;
+ {$IFEND}
+ {$IF LIBAVFORMAT_VERSION >= 52001000} // 52.1.0
+ read_seek: function(opaque: Pointer; stream_index: cint;
+ timestamp: cint64; flags: cint): cint64; cdecl;
+ {$IFEND}
+ end;
+
+{$IF LIBAVFORMAT_VERSION >= 52070000} // 52.70.0
+(**
+ * Create a URLContext for accessing to the resource indicated by
+ * url, but do not initiate the connection yet.
+ *
+ * @param puc pointer to the location where, in case of success, the
+ * function puts the pointer to the created URLContext
+ * @param flags flags which control how the resource indicated by url
+ * is to be opened
+ * @return 0 in case of success, a negative value corresponding to an
+ * AVERROR code in case of failure
+ *)
+function url_alloc(h: PPURLContext; {const} url: PAnsiChar; flags: cint): cint;
+ cdecl; external av__format;
+
+(**
+ * Connect an URLContext that has been allocated by url_alloc
+ *)
+function url_connect(h: PURLContext): cint;
+ cdecl; external av__format;
+{$IFEND}
+
+{$IF LIBAVFORMAT_VERSION >= 52021000} // 52.21.0
+(**
+ * Create a URLContext for accessing to the resource indicated by
+ * URL, and open it using the URLProtocol up.
+ *
+ * @param puc pointer to the location where, in case of success, the
+ * function puts the pointer to the created URLContext
+ * @param flags flags which control how the resource indicated by URL
+ * is to be opened
+ * @return 0 in case of success, a negative value corresponding to an
+ * AVERROR code in case of failure
+ *)
+function url_open_protocol(puc: PPURLContext; up: PURLProtocol;
+{$IF LIBAVFORMAT_VERSION < 52047000} // 52.47.0
+ filename: {const} PAnsiChar; flags: cint): cint;
+{$ELSE}
+ url: {const} PAnsiChar; flags: cint): cint;
+{$IFEND}
+ cdecl; external av__format;
+{$IFEND}
+
+(**
+ * Create a URLContext for accessing to the resource indicated by
+ * url, and open it.
+ *
+ * @param puc pointer to the location where, in case of success, the
+ * function puts the pointer to the created URLContext
+ * @param flags flags which control how the resource indicated by url
+ * is to be opened
+ * @return 0 in case of success, a negative value corresponding to an
+ * AVERROR code in case of failure
+ *)
+{$IF LIBAVFORMAT_VERSION < 52047000} // 52.47.0
+function url_open(h: PPointer; filename: {const} PAnsiChar; flags: cint): cint;
+{$ELSE}
+function url_open(h: PPointer; url: {const} PAnsiChar; flags: cint): cint;
+{$IFEND}
+ cdecl; external av__format;
+function url_read (h: PURLContext; buf: PByteArray; size: cint): cint;
+ cdecl; external av__format;
+{$IF LIBAVFORMAT_VERSION >= 52034000} // 52.34.0
+function url_read_complete (h: PURLContext; buf: PByteArray; size: cint): cint; cdecl;
+ cdecl; external av__format;
+{$IFEND}
+function url_write (h: PURLContext; {const} buf: PByteArray; size: cint): cint;
+ cdecl; external av__format;
+function url_seek (h: PURLContext; pos: cint64; whence: cint): cint64;
+ cdecl; external av__format;
+
+(**
+ * Close the resource accessed by the URLContext h, and free the
+ * memory used by it.
+ *
+ * @return a negative value if an error condition occurred, 0
+ * otherwise
+ *)
+function url_close (h: PURLContext): cint;
+ cdecl; external av__format;
+
+(**
+ * Return a non-zero value if the resource indicated by url
+ * exists, 0 otherwise.
+ *)
+{$IF LIBAVFORMAT_VERSION < 52047000} // 52.47.0
+function url_exist(filename: {const} PAnsiChar): cint;
+{$ELSE}
+function url_exist(url: {const} PAnsiChar): cint;
+{$IFEND}
+ cdecl; external av__format;
+
+function url_filesize (h: PURLContext): cint64;
+ cdecl; external av__format;
+
+(**
+ * Return the file descriptor associated with this URL. For RTP, this
+ * will return only the RTP file descriptor, not the RTCP file descriptor.
+ * To get both, use rtp_get_file_handles().
+ *
+ * @return the file descriptor associated with this URL, or <0 on error.
+ *)
+(* not implemented *)
+function url_get_file_handle(h: PURLContext): cint;
+ cdecl; external av__format;
+
+(**
+ * Return the maximum packet size associated to packetized file
+ * handle. If the file is not packetized (stream like HTTP or file on
+ * disk), then 0 is returned.
+ *
+ * @param h file handle
+ * @return maximum packet size in bytes
+ *)
+function url_get_max_packet_size(h: PURLContext): cint;
+ cdecl; external av__format;
+procedure url_get_filename(h: PURLContext; buf: PAnsiChar; buf_size: cint);
+ cdecl; external av__format;
+
+(**
+ * The callback is called in blocking functions to test regulary if
+ * asynchronous interruption is needed. AVERROR(EINTR) is returned
+ * in this case by the interrupted function. 'NULL' means no interrupt
+ * callback is given.
+ *)
+procedure url_set_interrupt_cb (interrupt_cb: TURLInterruptCB);
+ cdecl; external av__format;
+
+(* not implemented *)
+function url_poll(poll_table: PURLPollEntry; n: cint; timeout: cint): cint;
+ cdecl; external av__format;
+
+{$IF LIBAVFORMAT_VERSION >= 52004000} // 52.4.0
+(**
+ * Pause and resume playing - only meaningful if using a network streaming
+ * protocol (e.g. MMS).
+ * @param pause 1 for pause, 0 for resume
+ *)
+function av_url_read_pause(h: PURLContext; pause: cint): cint;
+ cdecl; external av__format;
+{$IFEND}
+
+{$IF LIBAVFORMAT_VERSION >= 52001000} // 52.1.0
+(**
+ * Seek to a given timestamp relative to some component stream.
+ * Only meaningful if using a network streaming protocol (e.g. MMS.).
+ * @param stream_index The stream index that the timestamp is relative to.
+ * If stream_index is (-1) the timestamp should be in AV_TIME_BASE
+ * units from the beginning of the presentation.
+ * If a stream_index >= 0 is used and the protocol does not support
+ * seeking based on component streams, the call will fail with ENOTSUP.
+ * @param timestamp timestamp in AVStream.time_base units
+ * or if there is no stream specified then in AV_TIME_BASE units.
+ * @param flags Optional combination of AVSEEK_FLAG_BACKWARD, AVSEEK_FLAG_BYTE
+ * and AVSEEK_FLAG_ANY. The protocol may silently ignore
+ * AVSEEK_FLAG_BACKWARD and AVSEEK_FLAG_ANY, but AVSEEK_FLAG_BYTE will
+ * fail with ENOTSUP if used and not supported.
+ * @return >= 0 on success
+ * @see AVInputFormat::read_seek
+ *)
+function av_url_read_seek(h: PURLContext; stream_index: cint;
+ timestamp: cint64; flags: cint): cint64;
+ cdecl; external av__format;
+{$IFEND}
+
+(**
+var
+{$IF LIBAVFORMAT_VERSION < 52078003} // < 52.78.3
+ first_protocol: PURLProtocol; external av__format;
+{$ELSE}
+ {$IFDEF FF_API_REGISTER_PROTOCOL}
+ first_protocol: PURLProtocol; external av__format;
+ {$IFEND}
+{$IFEND}
+ url_interrupt_cb: PURLInterruptCB; external av__format;
+**)
+
+{$IF LIBAVFORMAT_VERSION >= 52002000} // 52.2.0
+(**
+ * If protocol is NULL, returns the first registered protocol,
+ * if protocol is non-NULL, returns the next registered protocol after protocol,
+ * or NULL if protocol is the last one.
+ *)
+function av_protocol_next(p: PURLProtocol): PURLProtocol;
+ cdecl; external av__format;
+{$IFEND}
+
+{$IF LIBAVFORMAT_VERSION <= 52028000} // 52.28.0
+(**
+ * Register the URLProtocol protocol.
+ *
+ *
+ * @deprecated Use av_register_protocol() instead.
+ *)
+function register_protocol(protocol: PURLProtocol): cint;
+ cdecl; external av__format;
+(** Alias for register_protocol()
+ *
+ * @deprecated Use av_register_protocol2() instead.
+ *)
+function av_register_protocol(protocol: PURLProtocol): cint;
+ cdecl; external av__format name 'register_protocol';
+{$ELSE}
+{$IF LIBAVFORMAT_VERSION < 52078003} // < 52.78.3
+function av_register_protocol(protocol: PURLProtocol): cint;
+ cdecl; external av__format;
+{$ELSE}
+ {$IFDEF FF_API_REGISTER_PROTOCOL}
+function av_register_protocol(protocol: PURLProtocol): cint;
+ cdecl; external av__format;
+ {$ENDIF}
+{$IFEND}
+{$IFEND}
+{$IF LIBAVFORMAT_VERSION >= 52069000} // 52.69.0
+function av_register_protocol2(protocol: PURLProtocol; size: cint): cint;
+ cdecl; external av__format;
+{$IFEND}
+
+type
+ TReadWriteFunc = function(opaque: Pointer; buf: PByteArray; buf_size: cint): cint; cdecl;
+ TSeekFunc = function(opaque: Pointer; offset: cint64; whence: cint): cint64; cdecl;
+
+function init_put_byte(s: PByteIOContext;
+ buffer: PByteArray;
+ buffer_size: cint; write_flag: cint;
+ opaque: pointer;
+ read_packet: TReadWriteFunc;
+ write_packet: TReadWriteFunc;
+ seek: TSeekFunc): cint;
+ cdecl; external av__format;
+{$IF LIBAVFORMAT_VERSION >= 52004000} // 52.4.0
+function av_alloc_put_byte(
+ buffer: PByteArray;
+ buffer_size: cint;
+ write_flag: cint;
+ opaque: Pointer;
+ read_packet: TReadWriteFunc;
+ write_packet: TReadWriteFunc;
+ seek: TSeekFunc): PByteIOContext;
+ cdecl; external av__format;
+{$IFEND}
+
+procedure put_byte(s: PByteIOContext; b: cint);
+ cdecl; external av__format;
+procedure put_buffer (s: PByteIOContext; buf: {const} PByteArray; size: cint);
+ cdecl; external av__format;
+procedure put_le64(s: PByteIOContext; val: cuint64);
+ cdecl; external av__format;
+procedure put_be64(s: PByteIOContext; val: cuint64);
+ cdecl; external av__format;
+procedure put_le32(s: PByteIOContext; val: cuint);
+ cdecl; external av__format;
+procedure put_be32(s: PByteIOContext; val: cuint);
+ cdecl; external av__format;
+procedure put_le24(s: PByteIOContext; val: cuint);
+ cdecl; external av__format;
+procedure put_be24(s: PByteIOContext; val: cuint);
+ cdecl; external av__format;
+procedure put_le16(s: PByteIOContext; val: cuint);
+ cdecl; external av__format;
+procedure put_be16(s: PByteIOContext; val: cuint);
+ cdecl; external av__format;
+procedure put_tag(s: PByteIOContext; tag: {const} PAnsiChar);
+ cdecl; external av__format;
+
+procedure put_strz(s: PByteIOContext; buf: {const} PAnsiChar);
+ cdecl; external av__format;
+
+(**
+ * fseek() equivalent for ByteIOContext.
+ * @return new position or AVERROR.
+ *)
+function url_fseek(s: PByteIOContext; offset: cint64; whence: cint): cint64;
+ cdecl; external av__format;
+
+(**
+ * Skip given number of bytes forward.
+ * @param offset number of bytes
+ * @return 0 on success, <0 on error
+ *)
+{$IF LIBAVFORMAT_VERSION < 52074000} // 52.74.0
+procedure url_fskip(s: PByteIOContext; offset: cint64);
+ cdecl; external av__format;
+{$ELSE}
+function url_fskip(s: PByteIOContext; offset: cint64): cint;
+ cdecl; external av__format;
+{$IFEND}
+
+(**
+ * ftell() equivalent for ByteIOContext.
+ * @return position or AVERROR.
+ *)
+function url_ftell(s: PByteIOContext): cint64;
+ cdecl; external av__format;
+
+(**
+ * Get the filesize.
+ * @return filesize or AVERROR
+ *)
+function url_fsize(s: PByteIOContext): cint64;
+ cdecl; external av__format;
+
+(**
+ * feof() equivalent for ByteIOContext.
+ * @return non zero if and only if end of file
+ *)
+function url_feof(s: PByteIOContext): cint;
+ cdecl; external av__format;
+
+function url_ferror(s: PByteIOContext): cint;
+ cdecl; external av__format;
+
+{$IF LIBAVFORMAT_VERSION >= 52004000} // 52.4.0
+function av_url_read_fpause(h: PByteIOContext; pause: cint): cint;
+ cdecl; external av__format;
+{$IFEND}
+
+{$IF LIBAVFORMAT_VERSION >= 52001000} // 52.1.0
+function av_url_read_fseek(h: PByteIOContext; stream_index: cint;
+ timestamp: cint64; flags: cint): cint64;
+ cdecl; external av__format;
+{$IFEND}
+
+const
+ URL_EOF = -1;
+(** @note return URL_EOF (-1) if EOF *)
+function url_fgetc(s: PByteIOContext): cint;
+ cdecl; external av__format;
+
+(** @warning currently size is limited *)
+function url_fprintf(s: PByteIOContext; fmt: {const} PAnsiChar; args: array of const): cint;
+ cdecl; external av__format;
+
+(** @note unlike fgets, the EOL character is not returned and a whole
+ line is parsed. return NULL if first char read was EOF *)
+function url_fgets(s: PByteIOContext; buf: PAnsiChar; buf_size: cint): PAnsiChar;
+ cdecl; external av__format;
+
+procedure put_flush_packet (s: PByteIOContext);
+ cdecl; external av__format;
+
+(**
+ * Read size bytes from ByteIOContext into buf.
+ * @return number of bytes read or AVERROR
+ *)
+function get_buffer(s: PByteIOContext; buf: PByteArray; size: cint): cint;
+ cdecl; external av__format;
+
+(**
+ * Read size bytes from ByteIOContext into buf.
+ * This reads at most 1 packet. If that is not enough fewer bytes will be
+ * returned.
+ * @return number of bytes read or AVERROR
+ *)
+function get_partial_buffer(s: PByteIOContext; buf: PByteArray; size: cint): cint;
+ cdecl; external av__format;
+
+(** @note return 0 if EOF, so you cannot use it if EOF handling is
+ necessary *)
+function get_byte(s: PByteIOContext): cint;
+ cdecl; external av__format;
+function get_le24(s: PByteIOContext): cuint;
+ cdecl; external av__format;
+function get_le32(s: PByteIOContext): cuint;
+ cdecl; external av__format;
+function get_le64(s: PByteIOContext): cuint64;
+ cdecl; external av__format;
+function get_le16(s: PByteIOContext): cuint;
+ cdecl; external av__format;
+
+function get_strz(s: PByteIOContext; buf: PAnsiChar; maxlen: cint): PAnsiChar;
+ cdecl; external av__format;
+function get_be16(s: PByteIOContext): cuint;
+ cdecl; external av__format;
+function get_be24(s: PByteIOContext): cuint;
+ cdecl; external av__format;
+function get_be32(s: PByteIOContext): cuint;
+ cdecl; external av__format;
+function get_be64(s: PByteIOContext): cuint64;
+ cdecl; external av__format;
+
+{$IF LIBAVFORMAT_VERSION >= 51017001} // 51.17.1
+ {$IF LIBAVFORMAT_VERSION < 52078003} // < 52.78.3
+function ff_get_v(bc: PByteIOContext): cuint64;
+ cdecl; external av__format;
+ {$ELSE}
+ {$IFDEF FF_API_URL_RESETBUF}
+function ff_get_v(bc: PByteIOContext): cuint64;
+ cdecl; external av__format;
+ {$ENDIF}
+ {$IFEND}
+{$IFEND}
+
+function url_is_streamed(s: PByteIOContext): cint; {$IFDEF HasInline}inline;{$ENDIF}
+
+(**
+ * Create and initialize a ByteIOContext for accessing the
+ * resource referenced by the URLContext h.
+ * @note When the URLContext h has been opened in read+write mode, the
+ * ByteIOContext can be used only for writing.
+ *
+ * @param s Used to return the pointer to the created ByteIOContext.
+ * In case of failure the pointed to value is set to NULL.
+ * @return 0 in case of success, a negative value corresponding to an
+ * AVERROR code in case of failure
+ *)
+{$IF LIBAVFORMAT_VERSION >= 52000000} // 52.0.0
+function url_fdopen (var s: PByteIOContext; h: PURLContext): cint;
+{$ELSE}
+function url_fdopen (s: PByteIOContext; h: PURLContext): cint;
+{$IFEND}
+ cdecl; external av__format;
+
+(** @warning must be called before any I/O *)
+function url_setbufsize (s: PByteIOContext; buf_size: cint): cint;
+ cdecl; external av__format;
+
+{$IF LIBAVFORMAT_VERSION_MAJOR < 53}
+{$IF LIBAVFORMAT_VERSION >= 51015000} // 51.15.0
+(** Reset the buffer for reading or writing.
+ * @note Will drop any data currently in the buffer without transmitting it.
+ * @param flags URL_RDONLY to set up the buffer for reading, or URL_WRONLY
+ * to set up the buffer for writing. *)
+function url_resetbuf(s: PByteIOContext; flags: cint): cint;
+ cdecl; external av__format;
+{$IFEND}
+{$IFEND}
+
+{$IF LIBAVFORMAT_VERSION >= 52061000} // 52.61.0
+(**
+ * Rewind the ByteIOContext using the specified buffer containing the first buf_size bytes of the file.
+ * Used after probing to avoid seeking.
+ * Joins buf and s->buffer, taking any overlap into consideration.
+ * @note s->buffer must overlap with buf or they can't be joined and the function fails
+ * @note This function is NOT part of the public API
+ *
+ * @param s The read-only ByteIOContext to rewind
+ * @param buf The probe buffer containing the first buf_size bytes of the file
+ * @param buf_size The size of buf
+ * @return 0 in case of success, a negative value corresponding to an
+ * AVERROR code in case of failure
+ *)
+function ff_rewind_with_probe_data(s: PByteIOContext; buf: PAnsiChar; buf_size: cint): cint;
+ cdecl; external av__format;
+{$IFEND}
+
+(**
+ * Create and initialize a ByteIOContext for accessing the
+ * resource indicated by url.
+ * @note When the resource indicated by url has been opened in
+ * read+write mode, the ByteIOContext can be used only for writing.
+ *
+ * @param s Used to return the pointer to the created ByteIOContext.
+ * In case of failure the pointed to value is set to NULL.
+ * @param flags flags which control how the resource indicated by url
+ * is to be opened
+ * @return 0 in case of success, a negative value corresponding to an
+ * AVERROR code in case of failure
+ *)
+{$IF LIBAVFORMAT_VERSION < 52047000} // 52.47.0
+{$IF LIBAVFORMAT_VERSION >= 52000000} // 52.0.0
+function url_fopen(var s: PByteIOContext; filename: {const} PAnsiChar; flags: cint): cint;
+{$ELSE}
+function url_fopen(s: PByteIOContext; filename: {const} PAnsiChar; flags: cint): cint;
+{$IFEND}
+{$ELSE}
+function url_fopen(var s: PByteIOContext; url: {const} PAnsiChar; flags: cint): cint;
+{$IFEND}
+ cdecl; external av__format;
+function url_fclose(s: PByteIOContext): cint;
+ cdecl; external av__format;
+function url_fileno(s: PByteIOContext): PURLContext;
+ cdecl; external av__format;
+
+(**
+ * Return the maximum packet size associated to packetized buffered file
+ * handle. If the file is not packetized (stream like http or file on
+ * disk), then 0 is returned.
+ *
+ * @param s buffered file handle
+ * @return maximum packet size in bytes
+ *)
+function url_fget_max_packet_size (s: PByteIOContext): cint;
+ cdecl; external av__format;
+
+{$IF LIBAVFORMAT_VERSION >= 52000000} // 52.0.0
+function url_open_buf(var s: PByteIOContext; buf: PAnsiChar; buf_size: cint; flags: cint): cint;
+{$ELSE}
+function url_open_buf(s: PByteIOContext; buf: PAnsiChar; buf_size: cint; flags: cint): cint;
+{$IFEND}
+ cdecl; external av__format;
+
+(** return the written or read size *)
+function url_close_buf(s: PByteIOContext): cint;
+ cdecl; external av__format;
+
+(**
+ * Open a write only memory stream.
+ *
+ * @param s new IO context
+ * @return zero if no error.
+ *)
+{$IF LIBAVFORMAT_VERSION >= 52000000} // 52.0.0
+function url_open_dyn_buf(var s: PByteIOContext): cint;
+{$ELSE}
+function url_open_dyn_buf(s: PByteIOContext): cint;
+{$IFEND}
+ cdecl; external av__format;
+
+(**
+ * Open a write only packetized memory stream with a maximum packet
+ * size of 'max_packet_size'. The stream is stored in a memory buffer
+ * with a big endian 4 byte header giving the packet size in bytes.
+ *
+ * @param s new IO context
+ * @param max_packet_size maximum packet size (must be > 0)
+ * @return zero if no error.
+ *)
+{$IF LIBAVFORMAT_VERSION >= 52000000} // 52.0.0
+function url_open_dyn_packet_buf(var s: PByteIOContext; max_packet_size: cint): cint;
+{$ELSE}
+function url_open_dyn_packet_buf(s: PByteIOContext; max_packet_size: cint): cint;
+{$IFEND}
+ cdecl; external av__format;
+
+(**
+ * Return the written size and a pointer to the buffer. The buffer
+ * must be freed with av_free(). If the buffer is opened with
+ * url_open_dyn_buf, then padding of FF_INPUT_BUFFER_PADDING_SIZE is
+ * added; if opened with url_open_dyn_packet_buf, no padding is added.
+ * @param s IO context
+ * @param pbuffer pointer to a byte buffer
+ * @return the length of the byte buffer
+ *)
+function url_close_dyn_buf(s: PByteIOContext; pbuffer:PPointer): cint;
+ cdecl; external av__format;
+
+{$IF LIBAVFORMAT_VERSION >= 51017001} // 51.17.1
+function ff_crc04C11DB7_update(checksum: culong; buf: {const} PByteArray;
+ len: cuint): culong;
+ cdecl; external av__format;
+{$IFEND}
+
+function get_checksum(s: PByteIOContext): culong;
+ cdecl; external av__format;
+procedure init_gsum(s: PByteIOContext;
+ update_checksum: pointer;
+ checksum: culong);
+ cdecl; external av__format;
+
+(* udp.c *)
+function udp_set_remote_url(h: PURLContext; uri: {const} PAnsiChar): cint;
+ cdecl; external av__format;
+function udp_get_local_port(h: PURLContext): cint;
+ cdecl; external av__format;
+
+{$IF LIBAVFORMAT_VERSION_MAJOR <= 52}
+function udp_get_file_handle(h: PURLContext): cint;
+ cdecl; external av__format;
+{$IFEND}
+
+implementation
+
+function url_is_streamed(s: PByteIOContext): cint;
+begin
+ Result := s^.is_streamed;
+end;
+
+end.