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Diffstat (limited to 'src/lib/ffmpeg/avio.pas')
| -rw-r--r-- | src/lib/ffmpeg/avio.pas | 796 |
1 files changed, 796 insertions, 0 deletions
diff --git a/src/lib/ffmpeg/avio.pas b/src/lib/ffmpeg/avio.pas new file mode 100644 index 00000000..adb59a44 --- /dev/null +++ b/src/lib/ffmpeg/avio.pas @@ -0,0 +1,796 @@ +(* + * 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. |