avutil.h 6.99 KB
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/*
 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
 *
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
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 * 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.
 *
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 * Libav is distributed in the hope that it will be useful,
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 * 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
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 * License along with Libav; if not, write to the Free Software
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 * 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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/**
 * @mainpage
 *
 * @section libav_intro Introduction
 *
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 * This document describes the usage of the different libraries
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 * provided by Libav.
 *
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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 lavr "libavresample" audio resampling, format conversion and mixing
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 * @li @ref libsws "libswscale"  color conversion and scaling library
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 *
 * @section libav_versioning Versioning and compatibility
 *
 * Each of the Libav 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.
 *
 * Libav 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 Libav 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
 * Libav versions or to replacing the dynamic Libav 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
 * Libav). 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.
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 */

/**
 * @defgroup lavu Common utility functions
 *
 * @brief
 * libavutil contains the code shared across all the other Libav
 * 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
 *
 * @{
 *
 * @}
 */


/**
 * @defgroup preproc_misc Preprocessor String Macros
 *
 * String manipulation macros
 *
 * @{
 */
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#define AV_STRINGIFY(s)         AV_TOSTRING(s)
#define AV_TOSTRING(s) #s
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#define AV_GLUE(a, b) a ## b
#define AV_JOIN(a, b) AV_GLUE(a, b)

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#define AV_PRAGMA(s) _Pragma(#s)
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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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/**
 * @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
 *
 * Libav 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.
 */

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#define AV_NOPTS_VALUE          INT64_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 {
    AV_PICTURE_TYPE_I = 1, ///< 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);

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/**
 * @}
 */

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#include "error.h"
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#include "version.h"
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/**
 * @}
 * @}
 */

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#endif /* AVUTIL_AVUTIL_H */