unit log;

{$include ffmpeg.inc}

interface

uses
  opt;

/// *
// * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
// *
// * 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
// */
//
// #include <stdarg.h>
// #include "avutil.h"
// #include "attributes.h"
//
Type
  TAVClassCategory = (AV_CLASS_CATEGORY_NA = 0, AV_CLASS_CATEGORY_INPUT, AV_CLASS_CATEGORY_OUTPUT, AV_CLASS_CATEGORY_MUXER,
    AV_CLASS_CATEGORY_DEMUXER, AV_CLASS_CATEGORY_ENCODER, AV_CLASS_CATEGORY_DECODER, AV_CLASS_CATEGORY_FILTER,
    AV_CLASS_CATEGORY_BITSTREAM_FILTER, AV_CLASS_CATEGORY_SWSCALER, AV_CLASS_CATEGORY_SWRESAMPLER, AV_CLASS_CATEGORY_NB);
  /// < not part of ABI/API

  // struct AVOptionRanges;

  /// **
  // * Describe the class of an AVClass context structure. That is an
  // * arbitrary struct of which the first field is a pointer to an
  // * AVClass struct (e.g. AVCodecContext, AVFormatContext etc.).
  // */
  pAVClass = ^TAVClass;

  TItem_name = function(ctx: Pointer): PAnsiChar; cdecl;
  TChild_next = procedure(obj: Pointer; prev: Pointer); cdecl;
  TChild_class_next = function(prev: pAVClass): pAVClass; cdecl;
  TGet_category = function(ctx: Pointer): TAVClassCategory; cdecl;
  TQuery_ranges = function(av_ranges: ppAVOptionRanges; obj: Pointer; key: PAnsiChar; flag: Integer): Integer; cdecl;

  TAVClass = {packed} record
    (*
      * The name of the class; usually it is the same name as the
      * context structure type to which the AVClass is associated.
    *)
    class_name: PAnsiChar;
    (*
      * A pointer to a function which returns the name of a context
      * instance ctx associated with the class.
    *)
    // const char* (*item_name)(void* ctx);
    item_name: TItem_name;
    (*
      * a pointer to the first option specified in the class if any or NULL
      *
      * @see av_set_default_options()
    *)
    option: pAVOption;
    (*
      * LIBAVUTIL_VERSION with which this structure was created.
      * This is used to allow fields to be added without requiring major
      * version bumps everywhere.
    *)
    version: Integer;
    (*
      * Offset in the structure where log_level_offset is stored.
      * 0 means there is no such variable
    *)
    log_level_offset_offset: Integer;
    (*
      * Offset in the structure where a pointer to the parent context for
      * logging is stored. For example a decoder could pass its AVCodecContext
      * to eval as such a parent context, which an av_log() implementation
      * could then leverage to display the parent context.
      * The offset can be NULL.
    *)
    parent_log_context_offset: Integer;
    (*
      * Return next AVOptions-enabled child or NULL
    *)
    // void* (*child_next)(void *obj, void *prev);
    child_next: TChild_next;
    (*
      * Return an AVClass corresponding to the next potential
      * AVOptions-enabled child.
      *
      * The difference between child_next and this is that
      * child_next iterates over _already existing_ objects, while
      * child_class_next iterates over _all possible_ children.
    *)
    // const struct AVClass* (*child_class_next)(const struct AVClass *prev);
    child_class_next: TChild_class_next;
    (*
      * Category used for visualization (like color)
      * This is only set if the category is equal for all objects using this class.
      * available since version (51 << 16 | 56 << 8 | 100)
    *)
    category: TAVClassCategory;
    (*
      * Callback to return the category.
      * available since version (51 << 16 | 59 << 8 | 100)
    *)
    // AVClassCategory (*get_category)(void* ctx);
    get_category: TGet_category;
    (*
      // * Callback to return the supported/allowed ranges.
      // * available since version (52.12)
    *)
    // int (*query_ranges)(struct AVOptionRanges **, void *obj, const char *key, int flags);
    query_ranges: TQuery_ranges;
  end;

const
  /// **
  // * @addtogroup lavu_log
  // *
  // * @{
  // *
  // * @defgroup lavu_log_constants Logging Constants
  // *
  // * @{
  // */
  //
  /// **
  // * Print no output.
  // */
  AV_LOG_QUIET = -8;
  //
  /// **
  // * Something went really wrong and we will crash now.
  // */
  AV_LOG_PANIC = 0;
  //
  /// **
  // * Something went wrong and recovery is not possible.
  // * For example, no header was found for a format which depends
  // * on headers or an illegal combination of parameters is used.
  // */
  AV_LOG_FATAL = 8;
  //
  /// **
  // * Something went wrong and cannot losslessly be recovered.
  // * However, not all future data is affected.
  // */
  AV_LOG_ERROR = 16;
  //
  /// **
  // * Something somehow does not look correct. This may or may not
  // * lead to problems. An example would be the use of '-vstrict -2'.
  // */
  AV_LOG_WARNING = 24;
  //
  /// **
  // * Standard information.
  // */
  AV_LOG_INFO = 32;
  //
  /// **
  // * Detailed information.
  // */
  AV_LOG_VERBOSE = 40;
  //
  /// **
  // * Stuff which is only useful for libav* developers.
  // */
  AV_LOG_DEBUG = 48;
  //
  AV_LOG_MAX_OFFSET = (AV_LOG_DEBUG - AV_LOG_QUIET);
  //
  /// **
  // * @}
  // */
  //
  /// **
  // * Send the specified message to the log if the level is less than or equal
  // * to the current av_log_level. By default, all logging messages are sent to
  // * stderr. This behavior can be altered by setting a different logging callback
  // * function.
  // * @see av_log_set_callback
  // *
  // * @param avcl A pointer to an arbitrary struct of which the first field is a
  // *        pointer to an AVClass struct.
  // * @param level The importance level of the message expressed using a @ref
  // *        lavu_log_constants "Logging Constant".
  // * @param fmt The format string (printf-compatible) that specifies how
  // *        subsequent arguments are converted to output.
  // */
  // void av_log(void *avcl, int level, const char *fmt, ...) av_printf_format(3, 4);
  //
  //
  /// **
  // * Send the specified message to the log if the level is less than or equal
  // * to the current av_log_level. By default, all logging messages are sent to
  // * stderr. This behavior can be altered by setting a different logging callback
  // * function.
  // * @see av_log_set_callback
  // *
  // * @param avcl A pointer to an arbitrary struct of which the first field is a
  // *        pointer to an AVClass struct.
  // * @param level The importance level of the message expressed using a @ref
  // *        lavu_log_constants "Logging Constant".
  // * @param fmt The format string (printf-compatible) that specifies how
  // *        subsequent arguments are converted to output.
  // * @param vl The arguments referenced by the format string.
  // */
  // void av_vlog(void *avcl, int level, const char *fmt, va_list vl);
  //
  /// **
  // * Get the current log level
  // *
  // * @see lavu_log_constants
  // *
  // * @return Current log level
  // */
  // int av_log_get_level(void);
  //
  /// **
  // * Set the log level
  // *
  // * @see lavu_log_constants
  // *
  // * @param level Logging level
  // */
  // void av_log_set_level(int level);
  //
  /// **
  // * Set the logging callback
  // *
  // * @note The callback must be thread safe, even if the application does not use
  // *       threads itself as some codecs are multithreaded.
  // *
  // * @see av_log_default_callback
  // *
  // * @param callback A logging function with a compatible signature.
  // */
  // void av_log_set_callback(void (*callback)(void*, int, const char*, va_list));
  //
  /// **
  // * Default logging callback
  // *
  // * It prints the message to stderr, optionally colorizing it.
  // *
  // * @param avcl A pointer to an arbitrary struct of which the first field is a
  // *        pointer to an AVClass struct.
  // * @param level The importance level of the message expressed using a @ref
  // *        lavu_log_constants "Logging Constant".
  // * @param fmt The format string (printf-compatible) that specifies how
  // *        subsequent arguments are converted to output.
  // * @param ap The arguments referenced by the format string.
  // */
  // void av_log_default_callback(void* ptr, int level, const char* fmt, va_list vl);
  //
  /// **
  // * Return the context name
  // *
  // * @param  ctx The AVClass context
  // *
  // * @return The AVClass class_name
  // */
  // const char* av_default_item_name(void* ctx);
  // AVClassCategory av_default_get_category(void *ptr);
  //
  /// **
  // * Format a line of log the same way as the default callback.
  // * @param line          buffer to receive the formated line
  // * @param line_size     size of the buffer
  // * @param print_prefix  used to store whether the prefix must be printed;
  // *                      must point to a persistent integer initially set to 1
  // */
  // void av_log_format_line(void *ptr, int level, const char *fmt, va_list vl,
  // char *line, int line_size, int *print_prefix);
  //
  /// **
  // * av_dlog macros
  // * Useful to print debug messages that shouldn't get compiled in normally.
  // */
  //
  // #ifdef DEBUG
  // #    define av_dlog(pctx, ...) av_log(pctx, AV_LOG_DEBUG, __VA_ARGS__)
  // #else
  // #    define av_dlog(pctx, ...) do { if (0) av_log(pctx, AV_LOG_DEBUG, __VA_ARGS__); } while (0)
  // #endif
  //
  /// **
  // * Skip repeated messages, this requires the user app to use av_log() instead of
  // * (f)printf as the 2 would otherwise interfere and lead to
  // * "Last message repeated x times" messages below (f)printf messages with some
  // * bad luck.
  // * Also to receive the last, "last repeated" line if any, the user app must
  // * call av_log(NULL, AV_LOG_QUIET, "%s", ""); at the end
  // */
  // #define AV_LOG_SKIP_REPEATED 1
  // void av_log_set_flags(int arg);
  //
  /// **
  // * @}
  // */

implementation

end.