avutil.h 8.25 KB
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/*
 * 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
 */

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#ifndef AVUTIL_AVUTIL_H
#define AVUTIL_AVUTIL_H
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/**
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 * @file
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 * external API header
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 */

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/**
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 * @mainpage
 *
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 * @section ffmpeg_intro Introduction
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 *
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 * This document describes the usage of the different libraries
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 * provided by FFmpeg.
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 *
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 * @li @ref libavc "libavcodec" encoding/decoding library
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 * @li @ref lavfi "libavfilter" graph-based frame editing library
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 * @li @ref libavf "libavformat" I/O and muxing/demuxing library
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 * @li @ref lavd "libavdevice" special devices muxing/demuxing library
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 * @li @ref lavu "libavutil" common utility library
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 * @li @ref lswr "libswresample" audio resampling, format conversion and mixing
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 * @li @ref lpp  "libpostproc" post processing library
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 * @li @ref libsws "libswscale" color conversion and scaling library
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 *
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 * @section ffmpeg_versioning Versioning and compatibility
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 *
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 * Each of the FFmpeg libraries contains a version.h header, which defines a
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 * 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.
 *
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 * FFmpeg guarantees backward API and ABI compatibility for each library as long
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 * 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.
 *
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 * In other words, any correct program that works with a given FFmpeg snapshot
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 * 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
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 * FFmpeg versions or to replacing the dynamic FFmpeg libraries that a program
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 * 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
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 * FFmpeg). New macros and enum values may be added. Behavior in undocumented
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 * 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.
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 */

/**
 * @defgroup lavu Common utility functions
 *
 * @brief
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 * libavutil contains the code shared across all the other FFmpeg
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 * libraries
 *
 * @note In order to use the functions provided by avutil you must include
 * the specific header.
 *
 * @{
 *
 * @defgroup lavu_crypto Crypto and Hashing
 *
 * @{
 * @}
 *
 * @defgroup lavu_math Maths
 * @{
 *
 * @}
 *
 * @defgroup lavu_string String Manipulation
 *
 * @{
 *
 * @}
 *
 * @defgroup lavu_mem Memory Management
 *
 * @{
 *
 * @}
 *
 * @defgroup lavu_data Data Structures
 * @{
 *
 * @}
 *
 * @defgroup lavu_audio Audio related
 *
 * @{
 *
 * @}
 *
 * @defgroup lavu_error Error Codes
 *
 * @{
 *
 * @}
 *
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 * @defgroup lavu_log Logging Facility
 *
 * @{
 *
 * @}
 *
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 * @defgroup lavu_misc Other
 *
 * @{
 *
 * @defgroup lavu_internal Internal
 *
 * Not exported functions, for internal usage only
 *
 * @{
 *
 * @}
 *
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 * @defgroup preproc_misc Preprocessor String Macros
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 *
 * @{
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 *
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 * @}
 */


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

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/**
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 * Return the LIBAVUTIL_VERSION_INT constant.
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 */
unsigned avutil_version(void);
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/**
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 * Return the libavutil build-time configuration.
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 */
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const char *avutil_configuration(void);
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/**
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 * Return the libavutil license.
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 */
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const char *avutil_license(void);
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/**
 * @}
 */

/**
 * @addtogroup lavu_media Media Type
 * @brief Media Type
 */

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enum AVMediaType {
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    AVMEDIA_TYPE_UNKNOWN = -1,  ///< Usually treated as AVMEDIA_TYPE_DATA
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    AVMEDIA_TYPE_VIDEO,
    AVMEDIA_TYPE_AUDIO,
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    AVMEDIA_TYPE_DATA,          ///< Opaque data information usually continuous
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    AVMEDIA_TYPE_SUBTITLE,
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    AVMEDIA_TYPE_ATTACHMENT,    ///< Opaque data information usually sparse
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    AVMEDIA_TYPE_NB
};

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/**
 * 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);

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/**
 * @defgroup lavu_const Constants
 * @{
 *
 * @defgroup lavu_enc Encoding specific
 *
 * @note those definition should move to avcodec
 * @{
 */

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#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

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

/**
 * @brief Undefined timestamp value
 *
 * Usually reported by demuxer that work on containers that do not provide
 * either pts or dts.
 */

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#define AV_NOPTS_VALUE          ((int64_t)UINT64_C(0x8000000000000000))
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/**
 * Internal time base represented as integer
 */

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#define AV_TIME_BASE            1000000
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/**
 * Internal time base represented as fractional value
 */

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#define AV_TIME_BASE_Q          (AVRational){1, AV_TIME_BASE}

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

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enum AVPictureType {
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    AV_PICTURE_TYPE_NONE = 0, ///< Undefined
    AV_PICTURE_TYPE_I,     ///< Intra
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    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);

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/**
 * @}
 */

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#include "common.h"
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#include "error.h"
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#include "version.h"
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#include "macros.h"
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#include "mathematics.h"
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#include "rational.h"
#include "log.h"
#include "pixfmt.h"
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/**
 * 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);
}

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/**
 * 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,
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                                     const void *list, uint64_t term) av_pure;
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/**
 * 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) \
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    av_int_list_length_for_size(sizeof(*(list)), list, term)
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/**
 * 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);

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/**
 * @}
 * @}
 */

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#endif /* AVUTIL_AVUTIL_H */