#ifndef WH_AVUTIL_AVUTIL_H_6982e124_
#define WH_AVUTIL_AVUTIL_H_6982e124_

/*
 * This file was stolen from ffmpeg and modified for usability here.
 *  The original is
 * 
 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
 *
 * This version is a derivative work of that version.  It is not free
 *  software; it is licensed under the GNU Lesser General Public
 *  License version 2.1, which places nontrivial restrictions on what
 *  may be done with it.  (I'm not terribly happy about that, but for
 *  my purposes accepting LGPL-infected code is a lower price than
 *  reimplementing it all myself.)
 *
 * The LGPL v2.1 as distributed with ffmpeg is in the accompanying file
 *  `LGPL-v2.1'.
 */

/**
 * @defgroup preproc_misc Preprocessor String Macros
 *
 * String manipulation macros
 *
 * @{
 */

#define AV_STRINGIFY(s)         AV_TOSTRING(s)
#define AV_TOSTRING(s) #s

#define AV_GLUE(a, b) a ## b
#define AV_JOIN(a, b) AV_GLUE(a, b)

#define AV_PRAGMA(s) _Pragma(#s)

/**
 * @defgroup version_utils Library Version Macros
 *
 * Useful to check and match library version in order to maintain
 * backward compatibility.
 *
 * @{
 */

#define AV_VERSION_INT(a, b, c) (a<<16 | b<<8 | c)
#define AV_VERSION_DOT(a, b, c) a ##.## b ##.## c
#define AV_VERSION(a, b, c) AV_VERSION_DOT(a, b, c)

/**
 * @}
 *
 * @defgroup lavu_ver Version and Build diagnostics
 *
 * Macros and function useful to check at compiletime and at runtime
 * which version of libavutil is in use.
 *
 * @{
 */

#define LIBAVUTIL_VERSION_MAJOR 51
#define LIBAVUTIL_VERSION_MINOR 42
#define LIBAVUTIL_VERSION_MICRO 100

#define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \
                                               LIBAVUTIL_VERSION_MINOR, \
                                               LIBAVUTIL_VERSION_MICRO)
#define LIBAVUTIL_VERSION       AV_VERSION(LIBAVUTIL_VERSION_MAJOR,     \
                                           LIBAVUTIL_VERSION_MINOR,     \
                                           LIBAVUTIL_VERSION_MICRO)
#define LIBAVUTIL_BUILD         LIBAVUTIL_VERSION_INT

#define LIBAVUTIL_IDENT         "Lavu" AV_STRINGIFY(LIBAVUTIL_VERSION)

/**
 * @}
 *
 * @defgroup depr_guards Deprecation guards
 * Those FF_API_* defines are not part of public API.
 * They may change, break or disappear at any time.
 *
 * They are used mostly internally to mark code that will be removed
 * on the next major version.
 *
 * @{
 */
#ifndef FF_API_OLD_EVAL_NAMES
#define FF_API_OLD_EVAL_NAMES (LIBAVUTIL_VERSION_MAJOR < 52)
#endif
#ifndef FF_API_GET_BITS_PER_SAMPLE_FMT
#define FF_API_GET_BITS_PER_SAMPLE_FMT (LIBAVUTIL_VERSION_MAJOR < 52)
#endif
#ifndef FF_API_FIND_OPT
#define FF_API_FIND_OPT                 (LIBAVUTIL_VERSION_MAJOR < 52)
#endif
#ifndef FF_API_AV_FIFO_PEEK
#define FF_API_AV_FIFO_PEEK             (LIBAVUTIL_VERSION_MAJOR < 52)
#endif
#ifndef FF_API_OLD_AVOPTIONS
#define FF_API_OLD_AVOPTIONS            (LIBAVUTIL_VERSION_MAJOR < 52)
#endif

/**
 * @}
 */

/**
 * @addtogroup lavu_ver
 * @{
 */

/**
 * 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
 */

enum AVMediaType {
    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
 * @{
 */

#define FF_LAMBDA_SHIFT 7
#define FF_LAMBDA_SCALE (1<<FF_LAMBDA_SHIFT)
#define FF_QP2LAMBDA 118 ///< factor to convert from H.263 QP to lambda
#define FF_LAMBDA_MAX (256*128-1)

#define 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.
 */

#define AV_NOPTS_VALUE          INT64_C(0x8000000000000000)

/**
 * Internal time base represented as integer
 */

#define AV_TIME_BASE            1000000

/**
 * Internal time base represented as fractional value
 */

#define AV_TIME_BASE_Q          (AVRational){1, AV_TIME_BASE}

/**
 * @}
 * @}
 * @defgroup lavu_picture Image related
 *
 * AVPicture types, pixel formats and basic image planes manipulation.
 *
 * @{
 */

enum AVPictureType {
    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);

/*
 * In the original file, these two were only one (av_x_if_null),
 *  commented "Return x default pointer in case p is NULL." and the
 *  body was
 *
 *	return (void *)(intptr_t)(p ? p : x);
 *
 *  The only reason I can see for the cast to intptr_t and back is to
 *  strip the const, which strikes me as extremely broken.  The only
 *  even vaguely sane excuse I can see for it is to be able to use the
 *  same "function" for consted pointers and non-consted pointers.
 *
 * We, of course, deal with this by having two slightly different
 *  calls, one for consted pointers and onje for non-cojnsted.
 */

static inline void *av_x_if_null_w(void *p, void *x)
{
 return(p?p:x);
}

static inline const void *av_x_if_null_c(const void *p, const void *x)
{
 return(p?p:x);
}

#endif