Delphi-OpenCV/source/ffmpeg/ffm.avutil.pas

unit ffm.avutil;

{$i ffmpeg.inc}

interface

uses
  ffm.rational, ffm.ctypes;

(*
  * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
  *
  * This file is part of ffm.
  *
  * 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
*)

(*
  * @mainpage
  *
  * @section ffmpeg_intro Introduction
  *
  * This document describes the usage of the different libraries
  * provided by ffm.
  *
  * @li @ref libavc "libavcodec" encoding/decoding library
  * @li @ref lavfi "libavfilter" graph-based frame editing library
  * @li @ref libavf "libavformat" I/O and muxing/demuxing library
  * @li @ref lavd "libavdevice" special devices muxing/demuxing library
  * @li @ref lavu "libavutil" common utility library
  * @li @ref lswr "libswresample" audio resampling, format conversion and mixing
  * @li @ref lpp  "libpostproc" post processing library
  * @li @ref lsws "libswscale" color conversion and scaling library
  *
  * @section ffmpeg_versioning Versioning and compatibility
  *
  * Each of the FFmpeg libraries contains a version.h header, which defines a
  * major, minor and micro version number with the
  * <em>LIBRARYNAME_VERSION_{MAJOR,MINOR,MICRO}</em> macros. The major version
  * number is incremented with backward incompatible changes - e.g. removing
  * parts of the public API, reordering public struct members, etc. The minor
  * version number is incremented for backward compatible API changes or major
  * new features - e.g. adding a new public function or a new decoder. The micro
  * version number is incremented for smaller changes that a calling program
  * might still want to check for - e.g. changing behavior in a previously
  * unspecified situation.
  *
  * FFmpeg guarantees backward API and ABI compatibility for each library as long
  * as its major version number is unchanged. This means that no public symbols
  * will be removed or renamed. Types and names of the public struct members and
  * values of public macros and enums will remain the same (unless they were
  * explicitly declared as not part of the public API). Documented behavior will
  * not change.
  *
  * In other words, any correct program that works with a given FFmpeg snapshot
  * should work just as well without any changes with any later snapshot with the
  * same major versions. This applies to both rebuilding the program against new
  * FFmpeg versions or to replacing the dynamic FFmpeg libraries that a program
  * links against.
  *
  * However, new public symbols may be added and new members may be appended to
  * public structs whose size is not part of public ABI (most public structs in
  * FFmpeg). New macros and enum values may be added. Behavior in undocumented
  * situations may change slightly (and be documented). All those are accompanied
  * by an entry in doc/APIchanges and incrementing either the minor or micro
  * version number.
*)

(*
  * Return the LIBAVUTIL_VERSION_INT constant.
*)
// unsigned avutil_version(void);
//
(*
  * Return the libavutil build-time configuration.
*)
// const char *avutil_configuration(void);
//
(*
  * Return the libavutil license.
*)
// const char *avutil_license(void);
//
(*
  * @addtogroup lavu_media Media Type
  * @brief Media Type
*)
Type
  TAVMediaType = ( //
    AVMEDIA_TYPE_UNKNOWN = -1,
    /// < Usually treated as AVMEDIA_TYPE_DATA
    AVMEDIA_TYPE_VIDEO, //
    AVMEDIA_TYPE_AUDIO, //
    AVMEDIA_TYPE_DATA, //
    /// < Opaque data information usually continuous
    AVMEDIA_TYPE_SUBTITLE, //
    AVMEDIA_TYPE_ATTACHMENT, //
    /// < Opaque data information usually sparse
    AVMEDIA_TYPE_NB);

  //
  (*
    * Return a string describing the media_type enum, NULL if media_type
    * is unknown.
  *)
  // const char *av_get_media_type_string(enum AVMediaType media_type);
  //
  (*
    * @defgroup lavu_const Constants
    * @{
    *
    * @defgroup lavu_enc Encoding specific
    *
    * @note those definition should move to avcodec
    * @{
  *)
const
  FF_LAMBDA_SHIFT = 7;
  FF_LAMBDA_SCALE = 1 shl FF_LAMBDA_SHIFT;
  FF_QP2LAMBDA    = 118;
  /// < factor to convert from H.263 QP to lambda
  FF_LAMBDA_MAX = (256 * 128 - 1);

  FF_QUALITY_SCALE = FF_LAMBDA_SCALE; // FIXME maybe remove

  (*
    // * @}
    // * @defgroup lavu_time Timestamp specific
    // *
    // * FFmpeg internal timebase and timestamp definitions
    // *
    // * @{
  *)

  (*
    * @brief Undefined timestamp value
    *
    * Usually reported by demuxer that work on containers that do not provide
    * either pts or dts.
  *)
  AV_NOPTS_VALUE = $8000000000000000;

  (*
    * Internal time base represented as integer
  *)
  AV_TIME_BASE = 1000000;

  (*
    * Internal time base represented as fractional value
  *)
  AV_TIME_BASE_Q: TAVRational = (num: 1; den: AV_TIME_BASE);

  //
  (*
    // * @}
    // * @}
    // * @defgroup lavu_picture Image related
    // *
    // * AVPicture types, pixel formats and basic image planes manipulation.
    // *
    // * @{
  *)
Type
  pAVPictureType = ^TAVPictureType;
  TAVPictureType = ( //
    AV_PICTURE_TYPE_NONE = 0,
    /// < Undefined
    AV_PICTURE_TYPE_I,
    /// < Intra
    AV_PICTURE_TYPE_P,
    /// < Predicted
    AV_PICTURE_TYPE_B,
    /// < Bi-dir predicted
    AV_PICTURE_TYPE_S,
    /// < S(GMC)-VOP MPEG4
    AV_PICTURE_TYPE_SI,
    /// < Switching Intra
    AV_PICTURE_TYPE_SP,
    /// < Switching Predicted
    AV_PICTURE_TYPE_BI
    /// < BI type
    );
  (*
    * Return a single letter to describe the given picture type
    * pict_type.
    *
    * @param[in] pict_type the picture type @return a single character
    * representing the picture type, '?' if pict_type is unknown
  *)
  // char av_get_picture_type_char(enum AVPictureType pict_type);

  // #include "common.h"
  // #include "error.h"
  // #include "version.h"
  // #include "mathematics.h"
  // #include "rational.h"
  // #include "intfloat_readwrite.h"
  // #include "log.h"
  // #include "pixfmt.h"
  //
  (*
    // * Return x default pointer in case p is NULL.
  *)
  // static inline void *av_x_if_null(const void *p, const void *x)
  // {
  // return (void *)(intptr_t)(p ? p : x);
  // }
  //
  (*
    * Compute the length of an integer list.
    *
    * @param elsize  size in bytes of each list element (only 1, 2, 4 or 8)
    * @param term    list terminator (usually 0 or -1)
    * @param list    pointer to the list
    * @return  length of the list, in elements, not counting the terminator
  *)
  // unsigned av_int_list_length_for_size(unsigned elsize,
  // const void *list, uint64_t term) av_pure;
function av_int_list_length_for_size(elsize: Cardinal; const list: Pointer; term: uint64_t): Cardinal; cdecl;
(*
  // * Compute the length of an integer list.
  // *
  // * @param term  list terminator (usually 0 or -1)
  // * @param list  pointer to the list
  // * @return  length of the list, in elements, not counting the terminator
*)
// #define av_int_list_length(list, term) \
// av_int_list_length_for_size(sizeof(*(list)), list, term)
//
(*
  // * Open a file using a UTF-8 filename.
  // * The API of this function matches POSIX fopen(), errors are returned through
  // * errno.
*)
// FILE *av_fopen_utf8(const char *path, const char *mode);

implementation

uses ffm.lib;

function av_int_list_length_for_size; external avutil_dll;

end.