/*
 * 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
 */
module ffmpeg.libavutil.log;

import core.stdc.string;
import core.stdc.stdarg;

extern (C) @nogc nothrow:

enum AVClassCategory
{
    AV_CLASS_CATEGORY_NA = 0,
    AV_CLASS_CATEGORY_INPUT = 1,
    AV_CLASS_CATEGORY_OUTPUT = 2,
    AV_CLASS_CATEGORY_MUXER = 3,
    AV_CLASS_CATEGORY_DEMUXER = 4,
    AV_CLASS_CATEGORY_ENCODER = 5,
    AV_CLASS_CATEGORY_DECODER = 6,
    AV_CLASS_CATEGORY_FILTER = 7,
    AV_CLASS_CATEGORY_BITSTREAM_FILTER = 8,
    AV_CLASS_CATEGORY_SWSCALER = 9,
    AV_CLASS_CATEGORY_SWRESAMPLER = 10,
    AV_CLASS_CATEGORY_DEVICE_VIDEO_OUTPUT = 40,
    AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT = 41,
    AV_CLASS_CATEGORY_DEVICE_AUDIO_OUTPUT = 42,
    AV_CLASS_CATEGORY_DEVICE_AUDIO_INPUT = 43,
    AV_CLASS_CATEGORY_DEVICE_OUTPUT = 44,
    AV_CLASS_CATEGORY_DEVICE_INPUT = 45,
    AV_CLASS_CATEGORY_NB = 46 ///< not part of ABI/API
}

extern (D) auto AV_IS_INPUT_DEVICE(T)(auto ref T category)
{
    return (category == AVClassCategory.AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT) || (category == AVClassCategory.AV_CLASS_CATEGORY_DEVICE_AUDIO_INPUT) || (category == AVClassCategory.AV_CLASS_CATEGORY_DEVICE_INPUT);
}

extern (D) auto AV_IS_OUTPUT_DEVICE(T)(auto ref T category)
{
    return (category == AVClassCategory.AV_CLASS_CATEGORY_DEVICE_VIDEO_OUTPUT) || (category == AVClassCategory.AV_CLASS_CATEGORY_DEVICE_AUDIO_OUTPUT) || (category == AVClassCategory.AV_CLASS_CATEGORY_DEVICE_OUTPUT);
}

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.).
 */
struct AVClass
{
    /**
     * The name of the class; usually it is the same name as the
     * context structure type to which the AVClass is associated.
     */
    const(char)* class_name;

    /**
     * A pointer to a function which returns the name of a context
     * instance ctx associated with the class.
     */
    const(char)* function (void* ctx) item_name;

    /**
     * a pointer to the first option specified in the class if any or NULL
     *
     * @see av_set_default_options()
     */
    struct AVOption;
    const(AVOption)* option;

    /**
     * LIBAVUTIL_VERSION with which this structure was created.
     * This is used to allow fields to be added without requiring major
     * version bumps everywhere.
     */

    int version_;

    /**
     * Offset in the structure where log_level_offset is stored.
     * 0 means there is no such variable
     */
    int log_level_offset_offset;

    /**
     * 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.
     */
    int parent_log_context_offset;

    /**
     * Return next AVOptions-enabled child or NULL
     */
    void* function (void* obj, void* prev) child_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(AVClass)* function (const(AVClass)* prev) child_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)
     */
    AVClassCategory category;

    /**
     * Callback to return the category.
     * available since version (51 << 16 | 59 << 8 | 100)
     */
    AVClassCategory function (void* ctx) get_category;

    /**
     * Callback to return the supported/allowed ranges.
     * available since version (52.12)
     */
    int function (AVOptionRanges**, void* obj, const(char)* key, int flags) query_ranges;

    /**
     * Iterate over the AVClasses corresponding to potential AVOptions-enabled
     * children.
     *
     * @param iter pointer to opaque iteration state. The caller must initialize
     *             *iter to NULL before the first call.
     * @return AVClass for the next AVOptions-enabled child or NULL if there are
     *         no more such children.
     *
     * @note The difference between child_next and this is that child_next
     *       iterates over _already existing_ objects, while child_class_iterate
     *       iterates over _all possible_ children.
     */
    const(AVClass)* function (void** iter) child_class_iterate;
}

/**
 * @addtogroup lavu_log
 *
 * @{
 *
 * @defgroup lavu_log_constants Logging Constants
 *
 * @{
 */

/**
 * Print no output.
 */
enum AV_LOG_QUIET = -8;

/**
 * Something went really wrong and we will crash now.
 */
enum 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.
 */
enum AV_LOG_FATAL = 8;

/**
 * Something went wrong and cannot losslessly be recovered.
 * However, not all future data is affected.
 */
enum 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'.
 */
enum AV_LOG_WARNING = 24;

/**
 * Standard information.
 */
enum AV_LOG_INFO = 32;

/**
 * Detailed information.
 */
enum AV_LOG_VERBOSE = 40;

/**
 * Stuff which is only useful for libav* developers.
 */
enum AV_LOG_DEBUG = 48;

/**
 * Extremely verbose debugging, useful for libav* development.
 */
enum AV_LOG_TRACE = 56;

enum AV_LOG_MAX_OFFSET = AV_LOG_TRACE - AV_LOG_QUIET;

/**
 * @}
 */

/**
 * Sets additional colors for extended debugging sessions.
 * @code
   av_log(ctx, AV_LOG_DEBUG|AV_LOG_C(134), "Message in purple\n");
   @endcode
 * Requires 256color terminal support. Uses outside debugging is not
 * recommended.
 */
extern (D) auto AV_LOG_C(T)(auto ref T x)
{
    return x << 8;
}

/**
 * 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 or NULL if general log.
 * @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, ...);

/**
 * Send the specified message to the log once with the initial_level and then with
 * the subsequent_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
 *
 * @param avcl A pointer to an arbitrary struct of which the first field is a
 *        pointer to an AVClass struct or NULL if general log.
 * @param initial_level importance level of the message expressed using a @ref
 *        lavu_log_constants "Logging Constant" for the first occurance.
 * @param subsequent_level importance level of the message expressed using a @ref
 *        lavu_log_constants "Logging Constant" after the first occurance.
 * @param fmt The format string (printf-compatible) that specifies how
 *        subsequent arguments are converted to output.
 * @param state a variable to keep trak of if a message has already been printed
 *        this must be initialized to 0 before the first use. The same state
 *        must not be accessed by 2 Threads simultaneously.
 */
void av_log_once (void* avcl, int initial_level, int subsequent_level, int* state, const(char)* fmt, ...);

/**
 * 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 ();

/**
 * 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 function (void*, int, const(char)*, va_list) callback);

/**
 * 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 vl The arguments referenced by the format string.
 */
void av_log_default_callback (
    void* avcl,
    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 formatted 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);

/**
 * Format a line of log the same way as the default callback.
 * @param line          buffer to receive the formatted line;
 *                      may be NULL if line_size is 0
 * @param line_size     size of the buffer; at most line_size-1 characters will
 *                      be written to the buffer, plus one null terminator
 * @param print_prefix  used to store whether the prefix must be printed;
 *                      must point to a persistent integer initially set to 1
 * @return Returns a negative value if an error occurred, otherwise returns
 *         the number of characters that would have been written for a
 *         sufficiently large buffer, not including the terminating null
 *         character. If the return value is not less than line_size, it means
 *         that the log message was truncated to fit the buffer.
 */
int av_log_format_line2 (
    void* ptr,
    int level,
    const(char)* fmt,
    va_list vl,
    char* line,
    int line_size,
    int* print_prefix);

/**
 * 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
 */
enum AV_LOG_SKIP_REPEATED = 1;

/**
 * Include the log severity in messages originating from codecs.
 *
 * Results in messages such as:
 * [rawvideo @ 0xDEADBEEF] [error] encode did not produce valid pts
 */
enum AV_LOG_PRINT_LEVEL = 2;

void av_log_set_flags (int arg);
int av_log_get_flags ();

/**
 * @}
 */

/* AVUTIL_LOG_H */