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Diffstat (limited to '')
| -rw-r--r-- | src/lib/ffmpeg7/avio.pas | 889 |
1 files changed, 889 insertions, 0 deletions
diff --git a/src/lib/ffmpeg7/avio.pas b/src/lib/ffmpeg7/avio.pas new file mode 100644 index 00000000..426f5f75 --- /dev/null +++ b/src/lib/ffmpeg7/avio.pas @@ -0,0 +1,889 @@ +(* + * 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. + * - 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 + * avformat version: 52.110.0 + *) + +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, + {$IFDEF UNIX} + BaseUnix, // for SEEK_CUR + {$ENDIF} + avcodec, + avutil, + SysUtils, + UConfig; + +(** + * Those FF_API_* defines are not part of public API. + * They may change, break or disappear at any time. + *) +const + FF_API_MAX_STREAMS = (LIBAVFORMAT_VERSION_MAJOR < 53); + FF_API_OLD_METADATA = (LIBAVFORMAT_VERSION_MAJOR < 53); + FF_API_OLD_METADATA2 = (LIBAVFORMAT_VERSION_MAJOR < 54); + FF_API_URL_CLASS = (LIBAVFORMAT_VERSION_MAJOR >= 53); + FF_API_URL_RESETBUF = (LIBAVFORMAT_VERSION_MAJOR < 53); + FF_API_REGISTER_PROTOCOL = (LIBAVFORMAT_VERSION_MAJOR < 53); + FF_API_GUESS_FORMAT = (LIBAVFORMAT_VERSION_MAJOR < 53); + FF_API_UDP_GET_FILE = (LIBAVFORMAT_VERSION_MAJOR < 53); + FF_API_URL_SPLIT = (LIBAVFORMAT_VERSION_MAJOR < 53); + FF_API_ALLOC_FORMAT_CONTEXT = (LIBAVFORMAT_VERSION_MAJOR < 53); + FF_API_PARSE_FRAME_PARAM = (LIBAVFORMAT_VERSION_MAJOR < 53); + FF_API_READ_SEEK = (LIBAVFORMAT_VERSION_MAJOR < 54); + FF_API_LAVF_UNUSED = (LIBAVFORMAT_VERSION_MAJOR < 53); + FF_API_PARAMETERS_CODEC_ID = (LIBAVFORMAT_VERSION_MAJOR < 53); + FF_API_FIRST_FORMAT = (LIBAVFORMAT_VERSION_MAJOR < 53); + FF_API_SYMVER = (LIBAVFORMAT_VERSION_MAJOR < 53); + FF_API_OLD_AVIO = (LIBAVFORMAT_VERSION_MAJOR < 54); + FF_API_INDEX_BUILT = (LIBAVFORMAT_VERSION_MAJOR < 53); + FF_API_DUMP_FORMAT = (LIBAVFORMAT_VERSION_MAJOR < 54); + FF_API_PARSE_DATE = (LIBAVFORMAT_VERSION_MAJOR < 54); + FF_API_FIND_INFO_TAG = (LIBAVFORMAT_VERSION_MAJOR < 54); + FF_API_PKT_DUMP = (LIBAVFORMAT_VERSION_MAJOR < 54); + FF_API_GUESS_IMG2_CODEC = (LIBAVFORMAT_VERSION_MAJOR < 54); + FF_API_SDP_CREATE = (LIBAVFORMAT_VERSION_MAJOR < 54); + FF_API_ALLOC_OUTPUT_CONTEXT = (LIBAVFORMAT_VERSION_MAJOR < 54); + FF_API_FORMAT_PARAMETERS = (LIBAVFORMAT_VERSION_MAJOR < 54); + FF_API_FLAG_RTP_HINT = (LIBAVFORMAT_VERSION_MAJOR < 54); + +const + AVIO_SEEKABLE_NORMAL = 0001; (**< Seeking works like for a local file *) + URL_PROTOCOL_FLAG_NESTED_SCHEME = 1; (*< The protocol name can be the first part of a nested protocol scheme *) + +type + TReadWriteFunc = function(opaque: Pointer; buf: PByteArray; buf_size: cint): cint; cdecl; + TSeekFunc = function(opaque: Pointer; offset: cint64; whence: cint): cint64; cdecl; + +type +(** + * Bytestream IO Context. + * New fields can be added to the end with minor version bumps. + * Removal, reordering and changes to existing fields require a major + * version bump. + * sizeof(AVIOContext) must not be used outside libav*. + * + * @note None of the function pointers in AVIOContext should be called + * directly, they should only be set by the client application + * when implementing custom I/O. Normally these are set to the + * function pointers specified in avio_alloc_context() + *) + PAVIOContext = ^TAVIOContext; + TAVIOContext = record + buffer: PByteArray; (**< Start of the buffer. *) + buffer_size: cint; (**< Maximum buffer size *) + buf_ptr: PByteArray; (**< Current position in the buffer *) + buf_end: PByteArray; (**< End of the data, may be less than + buffer+buffer_size if the read function returned + less data than requested, e.g. for streams where + no more data has been received yet. *) + opaque: pointer; (**< A private pointer, passed to the read/write/seek/... + functions. *) + read_packet: TReadWriteFunc; + write_packet: TReadWriteFunc; + seek: TSeekFunc; + 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 *) +{$IF FF_API_OLD_AVIO} + is_streamed: cint; { deprecated } +{$ENDIF} + max_packet_size: cint; + checksum: culong; + checksum_ptr: PByteArray; + update_checksum: function (checksum: culong; buf: {const} PAnsiChar; size: cuint): culong; cdecl; + error: cint; (**< contains the error code or 0 if no error happened *) + (** + * Pause or resume playback for network streaming protocols - e.g. MMS. + *) + read_pause: function(opaque: Pointer; pause: cint): cint; cdecl; + (** + * Seek to a given timestamp in stream with the specified stream_index. + * Needed for some network streaming protocols which don't support seeking + * to byte position. + *) + read_seek: function(opaque: Pointer; stream_index: cint; + timestamp: cint64; flags: cint): cint64; cdecl; + (** + * A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable. + *) + seekable: cint; + end; + +(* unbuffered I/O *) + +{$IF FF_API_OLD_AVIO} + PURLProtocol = ^TURLProtocol; + +(** + * URL Context. + * New fields can be added to the end with minor version bumps. + * Removal, reordering and changes to existing fields require a major + * version bump. + * sizeof(URLContext) must not be used outside libav*. + * @deprecated This struct will be made private + *) + PPURLContext = ^PURLContext; + PURLContext = ^TURLContext; + TURLContext = record +{$IF FF_API_URL_CLASS} + av_class: {const} PAVClass; ///< information for av_log(). Set by url_open(). +{$ENDIF} + 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 *) + is_connected: cint; + end; + +(** + * @deprecated This struct is to be made private. Use the higher-level + * AVIOContext-based API instead. + *) + TURLProtocol = record + name: PAnsiChar; + url_open: function (h: PURLContext; url: {const} PAnsiChar; flags: cint): cint; cdecl; + url_read: function (h: PURLContext; buf: PByteArray; size: cint): cint; cdecl; + url_write: function (h: PURLContext; {const} buf: PByteArray; size: cint): cint; cdecl; + url_seek: function (h: PURLContext; pos: cint64; whence: cint): cint64; cdecl; + url_close: function (h: PURLContext): cint; cdecl; + next: PURLProtocol; + url_read_pause: function (h: PURLContext; pause: cint): cint; cdecl; + url_read_seek: function (h: PURLContext; stream_index: cint; + timestamp: cint64; flags: cint): cint64; cdecl; + url_get_file_handle: function (h: PURLContext): cint; cdecl; + priv_data_size: cint; + {const} priv_data_class: PAVClass; + flags: cint; + url_check: function (h: PURLContext; mask: cint): cint; + end; + + PURLPollEntry = ^TURLPollEntry; + TURLPollEntry = record + handle: PURLContext; + events: cint; + revents: cint; + end; + +(* not implemented *) +function url_poll(poll_table: PURLPollEntry; n: cint; timeout: cint): cint; + cdecl; external av__format; deprecated; + +const +(** + * @defgroup open_modes URL open modes + * The flags argument to url_open and cosins must be one of the following + * constants, optionally ORed with other flags. + * @ + *) + URL_RDONLY = 0; (**< read-only *) + URL_WRONLY = 1; (**< write-only *) + URL_RDWR = 2; (**< read-write *) +(** + * @ + *) + +(** + * Use non-blocking mode. + * If this flag is set, operations on the context will return + * AVERROR(EAGAIN) if they can not be performed immediately. + * If this flag is not set, operations on the context will never return + * AVERROR(EAGAIN). + * Note that this flag does not affect the opening/connecting of the + * context. Connecting a protocol will always block if necessary (e.g. on + * network protocols) but never hang (e.g. on busy devices). + * Warning: non-blocking protocols is work-in-progress; this flag may be + * silently ignored. + *) + URL_FLAG_NONBLOCK = 4; + +type + PURLInterruptCB = ^TURLInterruptCB; + TURLInterruptCB = function (): cint; cdecl; + +{ +var + url_interrupt_cb: PURLInterruptCB; cvar; external: av__format; +} + +(** + * @defgroup old_url_funcs Old url_* functions + * @eprecated. Use the buffered API based on AVIOContext instead. + * @ + *) +function url_open_protocol(puc: PPURLContext; up: PURLProtocol; + url: {const} PAnsiChar; flags: cint): cint; + cdecl; external av__format; deprecated; +function url_alloc(h: PPURLContext; {const} url: PAnsiChar; flags: cint): cint; + cdecl; external av__format; deprecated; +function url_connect(h: PURLContext): cint; + cdecl; external av__format; deprecated; +function url_open(h: PPointer; url: {const} PAnsiChar; flags: cint): cint; + cdecl; external av__format; deprecated; +function url_read (h: PURLContext; buf: PByteArray; size: cint): cint; + cdecl; external av__format; deprecated; +function url_read_complete (h: PURLContext; buf: PByteArray; size: cint): cint; + cdecl; external av__format; deprecated; +function url_write (h: PURLContext; {const} buf: PByteArray; size: cint): cint; + cdecl; external av__format; deprecated; +function url_seek (h: PURLContext; pos: cint64; whence: cint): cint64; + cdecl; external av__format; deprecated; +function url_close (h: PURLContext): cint; + cdecl; external av__format; deprecated; +function url_filesize (h: PURLContext): cint64; + cdecl; external av__format; deprecated; +function url_get_file_handle(h: PURLContext): cint; + cdecl; external av__format; deprecated; +function url_get_max_packet_size(h: PURLContext): cint; + cdecl; external av__format; deprecated; +procedure url_get_filename(h: PURLContext; buf: PAnsiChar; buf_size: cint); + cdecl; external av__format; deprecated; +function av_url_read_pause(h: PURLContext; pause: cint): cint; + cdecl; external av__format; deprecated; +function av_url_read_seek(h: PURLContext; stream_index: cint; + timestamp: cint64; flags: cint): cint64; + cdecl; external av__format; deprecated; +procedure url_set_interrupt_cb (interrupt_cb: TURLInterruptCB); + cdecl; external av__format; deprecated; + +(** + * returns the next registered protocol after the given protocol (the first if + * NULL is given), or NULL if protocol is the last one. + *) +function av_protocol_next(p: PURLProtocol): PURLProtocol; + cdecl; external av__format; + +(** + * Register the URLProtocol protocol. + * + * @param size the size of the URLProtocol struct referenced + *) +function av_register_protocol2(protocol: PURLProtocol; size: cint): cint; + cdecl; external av__format; deprecated; +(** + * @ + *) + +type + PByteIOContext = ^TByteIOContext; + TByteIOContext = TAVIOContext; { deprecated } + +function init_put_byte(s: PAVIOContext; + buffer: PByteArray; + buffer_size: cint; write_flag: cint; + opaque: pointer; + read_packet: TReadWriteFunc; + write_packet: TReadWriteFunc; + seek: TSeekFunc): cint; + cdecl; external av__format; deprecated; +function av_alloc_put_byte( + buffer: PByteArray; + buffer_size: cint; + write_flag: cint; + opaque: Pointer; + read_packet: TReadWriteFunc; + write_packet: TReadWriteFunc; + seek: TSeekFunc): PAVIOContext; + cdecl; external av__format; deprecated; + +(** + * @defgroup old_avio_funcs Old put_/get_*() functions + * The following functions are deprecated. Use the "avio_"-prefixed functions instead. + * @ + *) +function get_buffer(s: PAVIOContext; buf: PByteArray; size: cint): cint; + cdecl; external av__format; deprecated; +function get_partial_buffer(s: PAVIOContext; buf: PByteArray; size: cint): cint; + cdecl; external av__format; deprecated; +function get_byte(s: PAVIOContext): cint; + cdecl; external av__format; deprecated; +function get_le16(s: PAVIOContext): cuint; + cdecl; external av__format; deprecated; +function get_le24(s: PAVIOContext): cuint; + cdecl; external av__format; deprecated; +function get_le32(s: PAVIOContext): cuint; + cdecl; external av__format; deprecated; +function get_le64(s: PAVIOContext): cuint64; + cdecl; external av__format; deprecated; +function get_be16(s: PAVIOContext): cuint; + cdecl; external av__format; deprecated; +function get_be24(s: PAVIOContext): cuint; + cdecl; external av__format; deprecated; +function get_be32(s: PAVIOContext): cuint; + cdecl; external av__format; deprecated; +function get_be64(s: PAVIOContext): cuint64; + cdecl; external av__format; deprecated; + +procedure put_byte(s: PAVIOContext; b: cint); + cdecl; external av__format; deprecated; +procedure put_nbyte(s: PAVIOContext; b: cint; count: cint); + cdecl; external av__format; deprecated; +procedure put_buffer (s: PAVIOContext; buf: {const} PByteArray; size: cint); + cdecl; external av__format; deprecated; +procedure put_le64(s: PAVIOContext; val: cuint64); + cdecl; external av__format; deprecated; +procedure put_be64(s: PAVIOContext; val: cuint64); + cdecl; external av__format; deprecated; +procedure put_le32(s: PAVIOContext; val: cuint); + cdecl; external av__format; deprecated; +procedure put_be32(s: PAVIOContext; val: cuint); + cdecl; external av__format; deprecated; +procedure put_le24(s: PAVIOContext; val: cuint); + cdecl; external av__format; deprecated; +procedure put_be24(s: PAVIOContext; val: cuint); + cdecl; external av__format; deprecated; +procedure put_le16(s: PAVIOContext; val: cuint); + cdecl; external av__format; deprecated; +procedure put_be16(s: PAVIOContext; val: cuint); + cdecl; external av__format; deprecated; +procedure put_tag(s: PAVIOContext; tag: {const} PAnsiChar); + cdecl; external av__format; deprecated; +(** + * @ + *) + +function av_url_read_fpause(h: PAVIOContext; pause: cint): cint; + cdecl; external av__format; deprecated; +function av_url_read_fseek(h: PAVIOContext; stream_index: cint; + timestamp: cint64; flags: cint): cint64; + cdecl; external av__format; deprecated; + +(** + * @defgroup old_url_f_funcs Old url_f* functions + * @deprecated, use the "avio_"-prefixed functions instead. + * @ + *) +function url_fopen(var s: PAVIOContext; url: {const} PAnsiChar; flags: cint): cint; + cdecl; external av__format; deprecated; +function url_fclose(s: PAVIOContext): cint; + cdecl; external av__format; deprecated; +function url_fseek(s: PAVIOContext; offset: cint64; whence: cint): cint64; + cdecl; external av__format; deprecated; +function url_fskip(s: PAVIOContext; offset: cint64): cint; + cdecl; external av__format; deprecated; +function url_ftell(s: PAVIOContext): cint64; + cdecl; external av__format; deprecated; +function url_fsize(s: PAVIOContext): cint64; + cdecl; external av__format; deprecated; +const + URL_EOF = -1; +(** @note return URL_EOF (-1) if EOF *) +function url_fgetc(s: PAVIOContext): cint; + cdecl; external av__format; deprecated; +function url_setbufsize (s: PAVIOContext; buf_size: cint): cint; + cdecl; external av__format; deprecated; +function url_fprintf(s: PAVIOContext; fmt: {const} PAnsiChar; args: array of const): cint; + cdecl; external av__format; deprecated; +procedure put_flush_packet (s: PAVIOContext); + cdecl; external av__format; deprecated; +function url_open_dyn_buf(var s: PAVIOContext): cint; + cdecl; external av__format; deprecated; +function url_open_dyn_packet_buf(var s: PAVIOContext; max_packet_size: cint): cint; + cdecl; external av__format; deprecated; +function url_close_dyn_buf(s: PAVIOContext; pbuffer:PPointer): cint; + cdecl; external av__format; deprecated; +function url_fdopen (var s: PAVIOContext; h: PURLContext): cint; + cdecl; external av__format; deprecated; +(** + * @ + *) + +function url_ferror(s: PAVIOContext): cint; + cdecl; external av__format; deprecated; + +function udp_set_remote_url(h: PURLContext; uri: {const} PAnsiChar): cint; + cdecl; external av__format; deprecated; +function udp_get_local_port(h: PURLContext): cint; + cdecl; external av__format; deprecated; + +type + Tupdate_checksum = function (c: culong; p: Pcuint8; len: cuint): culong; cdecl; +procedure init_checksum(s: PAVIOContext; + update_checksum: Tupdate_checksum; + checksum: culong); + cdecl; external av__format; deprecated; +function get_checksum(s: PAVIOContext): culong; + cdecl; external av__format; deprecated; +procedure put_strz(s: PAVIOContext; buf: {const} PAnsiChar); + cdecl; external av__format; deprecated; +(** @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: PAVIOContext; buf: PAnsiChar; buf_size: cint): PAnsiChar; + cdecl; external av__format; deprecated; +(** + * @deprecated use avio_get_str instead + *) +function get_strz(s: PAVIOContext; buf: PAnsiChar; maxlen: cint): PAnsiChar; + cdecl; external av__format; deprecated; +(** + * @deprecated Use AVIOContext.seekable field directly. + *) +function url_is_streamed(s: PAVIOContext): cint; {$IFDEF HasInline}inline;{$ENDIF} deprecated; + +function url_fileno(s: PAVIOContext): PURLContext; + cdecl; external av__format; deprecated; + +(** + * @deprecated use AVIOContext.max_packet_size directly. + *) +function url_fget_max_packet_size (s: PAVIOContext): cint; + cdecl; external av__format; deprecated; + +function url_open_buf(var s: PAVIOContext; buf: PAnsiChar; buf_size: cint; flags: cint): cint; + cdecl; external av__format; deprecated; + +(** return the written or read size *) +function url_close_buf(s: PAVIOContext): cint; + cdecl; external av__format; deprecated; + +(** + * Return a non-zero value if the resource indicated by url + * exists, 0 otherwise. + * @deprecated Use avio_check instead. + *) +function url_exist(url: {const} PAnsiChar): cint; + cdecl; external av__format; deprecated; +{$ENDIF} // FF_API_OLD_AVIO + +(** + * Return AVIO_* access flags corresponding to the access permissions + * of the resource in url, or a negative value corresponding to an + * AVERROR code in case of failure. The returned access flags are + * masked by the value in flags. + * + * @note This function is intrinsically unsafe, in the sense that the + * checked resource may change its existence or permission status from + * one call to another. Thus you should not trust the returned value, + * unless you are sure that no other processes are accessing the + * checked resource. + * + * @note This function is slightly broken until next major bump + * because of AVIO_RDONLY == 0. Don't use it until then. + *) +function avio_check(url: {const} PAnsiChar; flags: cint): cint; + cdecl; external av__format; + +(** + * The callback is called in blocking functions to test regulary if + * asynchronous interruption is needed. AVERROR_EXIT is returned + * in this case by the interrupted function. 'NULL' means no interrupt + * callback is given. + *) +procedure avio_set_interrupt_cb(interrupt_cb: Pointer); + cdecl; external av__format; + +{$IF FF_API_REGISTER_PROTOCOL} +{ +var + first_protocol: PURLProtocol; cvar; external av__format; +} +{$IFEND} + +{$IF FF_API_REGISTER_PROTOCOL} +(** + * @deprecated Use av_register_protocol() instead. + *) +function register_protocol(protocol: PURLProtocol): cint; + cdecl; external av__format; deprecated; + +(** + * @deprecated Use av_register_protocol2() instead. + *) +function av_register_protocol(protocol: PURLProtocol): cint; + cdecl; external av__format; deprecated; +{$ENDIF} + +(** + * Allocate and initialize an AVIOContext for buffered I/O. It must be later + * freed with av_free(). + * + * @param buffer Memory block for input/output operations via AVIOContext. + * The buffer must be allocated with av_malloc() and friends. + * @param buffer_size The buffer size is very important for performance. + * For protocols with fixed blocksize it should be set to this blocksize. + * For others a typical size is a cache page, e.g. 4kb. + * @param write_flag Set to 1 if the buffer should be writable, 0 otherwise. + * @param opaque An opaque pointer to user-specific data. + * @param read_packet A function for refilling the buffer, may be NULL. + * @param write_packet A function for writing the buffer contents, may be NULL. + * @param seek A function for seeking to specified byte position, may be NULL. + * + * @return Allocated AVIOContext or NULL on failure. + *) +function avio_alloc_context( + buffer: PAnsiChar; + buffer_size: cint; + write_flag: cint; + opaque: Pointer; + read_packet: TReadWriteFunc; + write_packet: TReadWriteFunc; + seek: TSeekFunc): PAVIOContext; + cdecl; external av__format; + +procedure avio_w8(s: PAVIOContext; b: cint); + cdecl; external av__format; +procedure avio_write(s: PAVIOContext; buf: {const} PAnsiChar; size: cint); + cdecl; external av__format; +procedure avio_wl64(s: PAVIOContext; val: cuint64); + cdecl; external av__format; +procedure avio_wb64(s: PAVIOContext; val: cuint64); + cdecl; external av__format; +procedure avio_wl32(s: PAVIOContext; val: cuint); + cdecl; external av__format; +procedure avio_wb32(s: PAVIOContext; val: cuint); + cdecl; external av__format; +procedure avio_wl24(s: PAVIOContext; val: cuint); + cdecl; external av__format; +procedure avio_wb24(s: PAVIOContext; val: cuint); + cdecl; external av__format; +procedure avio_wl16(s: PAVIOContext; val: cuint); + cdecl; external av__format; +procedure avio_wb16(s: PAVIOContext; val: cuint); + cdecl; external av__format; + +(** + * Write a NULL-terminated string. + * @return number of bytes written. + *) +function avio_put_str(s: PAVIOContext; str: {const} PAnsiChar): cint; + cdecl; external av__format; + +(** + * Convert an UTF-8 string to UTF-16LE and write it. + * @return number of bytes written. + *) +function avio_put_str16le(s: PAVIOContext; str: {const} PAnsiChar): cint; + cdecl; external av__format; + +const + (** + * 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; + + (** + * 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 = $20000; + +(** + * fseek() equivalent for AVIOContext. + * @return new position or AVERROR. + *) +function avio_seek(s: PAVIOContext; offset: cint64; whence: cint): cint64; + cdecl; external av__format; + +(** + * Skip given number of bytes forward + * @return new position or AVERROR. + *) +function avio_skip(s: PAVIOContext; offset: cint64): cint64; + cdecl; external av__format; + +(** + * ftell() equivalent for AVIOContext. + * @return position or AVERROR. + *) +function avio_tell(s: PAVIOContext): cint64; {$IFDEF HasInline}inline;{$ENDIF} + +(** + * Get the filesize. + * @return filesize or AVERROR + *) +function avio_size(s: PAVIOContext): cint64; + cdecl; external av__format; + +(** + * feof() equivalent for AVIOContext. + * @return non zero if and only if end of file + *) +function url_feof(s: PAVIOContext): cint; + cdecl; external av__format; + +(** @warning currently size is limited *) +function avio_printf(s: PAVIOContext; fmt: {const} PAnsiChar; args: array of const): cint; + cdecl; external av__format; + +procedure avio_flush(s: PAVIOContext); + cdecl; external av__format; + +(** + * Read size bytes from AVIOContext into buf. + * @return number of bytes read or AVERROR + *) +function avio_read(s: PAVIOContext; buf: Pbyte; size: cint): cint; + cdecl; external av__format; + +(** + * @defgroup avio_read Functions for reading from AVIOContext + * @ + * + * @note return 0 if EOF, so you cannot use it if EOF handling is + * necessary + *) +function avio_r8(s: PAVIOContext): cint; + cdecl; external av__format; + +function avio_rl16(s: PAVIOContext): cuint; + cdecl; external av__format; + +function avio_rl24(s: PAVIOContext): cuint; + cdecl; external av__format; + +function avio_rl32(s: PAVIOContext): cuint; + cdecl; external av__format; + +function avio_rl64(s: PAVIOContext): cuint64; + cdecl; external av__format; + +function avio_rb16(s: PAVIOContext): cuint; + cdecl; external av__format; + +function avio_rb24(s: PAVIOContext): cuint; + cdecl; external av__format; + +function avio_rb32(s: PAVIOContext): cuint; + cdecl; external av__format; + +function avio_rb64(s: PAVIOContext): cuint64; + cdecl; external av__format; + +(** + * @ + *) +(** + * Read a string from pb into buf. The reading will terminate when either + * a NULL character was encountered, maxlen bytes have been read, or nothing + * more can be read from pb. The result is guaranteed to be NULL-terminated, it + * will be truncated if buf is too small. + * Note that the string is not interpreted or validated in any way, it + * might get truncated in the middle of a sequence for multi-byte encodings. + * + * @return number of bytes read (is always <= maxlen). + * If reading ends on EOF or error, the return value will be one more than + * bytes actually read. + *) +function avio_get_str(pb: PAVIOContext; maxlen: cint; buf: PAnsiChar; buflen: cint): cint; + cdecl; external av__format; + +(** + * Read a UTF-16 string from pb and convert it to UTF-8. + * The reading will terminate when either a null or invalid character was + * encountered or maxlen bytes have been read. + * @return number of bytes read (is always <= maxlen) + *) +function avio_get_str16le(pb: PAVIOContext; maxlen: cint; buf: PAnsiChar; buflen: cint): cint; + cdecl; external av__format; + +function avio_get_str16be(pb: PAVIOContext; maxlen: cint; buf: PAnsiChar; buflen: cint): cint; + cdecl; external av__format; + +{$IF FF_API_URL_RESETBUF} +(** 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: PAVIOContext; flags: cint): cint; + cdecl; external av__format; +{$ENDIF} + +(** + * @defgroup open_modes URL open modes + * The flags argument to avio_open must be one of the following + * constants, optionally ORed with other flags. + * @ + *) + +const +{$IF LIBAVFORMAT_VERSION_MAJOR < 53} + AVIO_RDONLY = 0; (**< read-only *) + AVIO_WRONLY = 1; (**< write-only *) + AVIO_RDWR = 2; (**< read-write *) +{$ELSE} + AVIO_RDONLY = 1; (**< read-only *) + AVIO_WRONLY = 2; (**< write-only *) + AVIO_RDWR = 4; (**< read-write *) +{$ENDIF} +(** + * @ + *) + +(** + * Use non-blocking mode. + * If this flag is set, operations on the context will return + * AVERROR(EAGAIN) if they can not be performed immediately. + * If this flag is not set, operations on the context will never return + * AVERROR(EAGAIN). + * Note that this flag does not affect the opening/connecting of the + * context. Connecting a protocol will always block if necessary (e.g. on + * network protocols) but never hang (e.g. on busy devices). + * Warning: non-blocking protocols is work-in-progress; this flag may be + * silently ignored. + *) +const +{$IF LIBAVFORMAT_VERSION_MAJOR < 53} + AVIO_FLAG_NONBLOCK = 4; +{$ELSE} + AVIO_FLAG_NONBLOCK = 8; +{$ENDIF} + +(** + * Create and initialize a AVIOContext for accessing the + * resource indicated by url. + * @note When the resource indicated by url has been opened in + * read+write mode, the AVIOContext can be used only for writing. + * + * @param s Used to return the pointer to the created AVIOContext. + * In case of failure the pointed to value is set to NULL. + * @param flags flags which control how the resource indicated by url + * is to be opened + * @return 0 in case of success, a negative value corresponding to an + * AVERROR code in case of failure + *) +function avio_open(var s: PAVIOContext; url: {const} PAnsiChar; flags: cint): cint; + cdecl; external av__format; + +(** + * Close the resource accessed by the AVIOContext s and free it. + * This function can only be used if s was opened by avio_open(). + * + * @return 0 on success, an AVERROR < 0 on error. + *) +function avio_close(s: PAVIOContext): cint; + cdecl; external av__format; + +(** + * Open a write only memory stream. + * + * @param s new IO context + * @return zero if no error. + *) +function avio_open_dyn_buf(var s: PAVIOContext): cint; + cdecl; external av__format; + +(** + * Return the written size and a pointer to the buffer. The buffer + * must be freed with av_free(). + * Padding of FF_INPUT_BUFFER_PADDING_SIZE is added to the buffer. + * + * @param s IO context + * @param pbuffer pointer to a byte buffer + * @return the length of the byte buffer + *) +function avio_close_dyn_buf(s: PAVIOContext; var pbuffer: Pcuint8): cint; + cdecl; external av__format; + +{$IF FF_API_UDP_GET_FILE} +function udp_get_file_handle(h: PURLContext): cint; + cdecl; external av__format; +{$ENDIF} + +(** + * Iterate through names of available protocols. + * @note it is recommanded to use av_protocol_next() instead of this + * + * @param opaque A private pointer representing current protocol. + * It must be a pointer to NULL on first iteration and will + * be updated by successive calls to avio_enum_protocols. + * @param output If set to 1, iterate over output protocols, + * otherwise over input protocols. + * + * @return A static string containing the name of current protocol or NULL + *) +function avio_enum_protocols(var opaque: Pointer; output: cint): {const} PAnsiChar; + cdecl; external av__format; + +(** + * Pause and resume playing - only meaningful if using a network streaming + * protocol (e.g. MMS). + * @param pause 1 for pause, 0 for resume + *) +function avio_pause(h: PAVIOContext; pause: cint): cint; + cdecl; external av__format; + +(** + * Seek to a given timestamp relative to some component stream. + * Only meaningful if using a network streaming protocol (e.g. MMS.). + * @param stream_index The stream index that the timestamp is relative to. + * If stream_index is (-1) the timestamp should be in AV_TIME_BASE + * units from the beginning of the presentation. + * If a stream_index >= 0 is used and the protocol does not support + * seeking based on component streams, the call will fail with ENOTSUP. + * @param timestamp timestamp in AVStream.time_base units + * or if there is no stream specified then in AV_TIME_BASE units. + * @param flags Optional combination of AVSEEK_FLAG_BACKWARD, AVSEEK_FLAG_BYTE + * and AVSEEK_FLAG_ANY. The protocol may silently ignore + * AVSEEK_FLAG_BACKWARD and AVSEEK_FLAG_ANY, but AVSEEK_FLAG_BYTE will + * fail with ENOTSUP if used and not supported. + * @return >= 0 on success + * @see AVInputFormat: : read_seek + *) +function avio_seek_time(h: PAVIOContext; stream_index: cint; + timestamp: cint64; flags: cint): cint64; + cdecl; external av__format; + +implementation + +{$IF (LIBAVFORMAT_VERSION_MAJOR < 54)} +function url_is_streamed(s: PAVIOContext): cint; +begin + Result := s^.is_streamed; +end; +{$ENDIF} + +function avio_tell(s: PAVIOContext): cint64; {$IFDEF HasInline}inline;{$ENDIF} +begin + Result := avio_seek(s, 0, SEEK_CUR); +end; + +end. |