344 lines
8.6 KiB
C
344 lines
8.6 KiB
C
/*
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* copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; 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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*/
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#ifndef AVUTIL_AVUTIL_H
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#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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*
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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
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* <em>LIBRARYNAME_VERSION_{MAJOR,MINOR,MICRO}</em> macros. The major version
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* number is incremented with backward incompatible changes - e.g. removing
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* parts of the public API, reordering public struct members, etc. The minor
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* version number is incremented for backward compatible API changes or major
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* new features - e.g. adding a new public function or a new decoder. The micro
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* version number is incremented for smaller changes that a calling program
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* might still want to check for - e.g. changing behavior in a previously
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* unspecified situation.
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*
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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
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* will be removed or renamed. Types and names of the public struct members and
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* values of public macros and enums will remain the same (unless they were
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* explicitly declared as not part of the public API). Documented behavior will
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* not change.
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*
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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
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* 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.
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*
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* However, new public symbols may be added and new members may be appended to
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* 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
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* by an entry in doc/APIchanges and incrementing either the minor or micro
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* version number.
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*/
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/**
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* @defgroup lavu Common utility functions
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*
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* @brief
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* libavutil contains the code shared across all the other FFmpeg
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* libraries
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*
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* @note In order to use the functions provided by avutil you must include
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* the specific header.
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*
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* @{
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*
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* @defgroup lavu_crypto Crypto and Hashing
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*
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* @{
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* @}
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*
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* @defgroup lavu_math Maths
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* @{
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*
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* @}
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*
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* @defgroup lavu_string String Manipulation
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*
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* @{
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*
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* @}
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*
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* @defgroup lavu_mem Memory Management
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*
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* @{
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*
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* @}
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*
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* @defgroup lavu_data Data Structures
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* @{
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*
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* @}
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*
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* @defgroup lavu_audio Audio related
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*
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* @{
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*
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* @}
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*
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* @defgroup lavu_error Error Codes
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*
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* @{
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*
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* @}
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*
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* @defgroup lavu_log Logging Facility
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*
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* @{
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*
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* @}
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*
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* @defgroup lavu_misc Other
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*
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* @{
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*
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* @defgroup preproc_misc Preprocessor String Macros
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*
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* @{
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*
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* @}
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*
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* @defgroup version_utils Library Version Macros
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*
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* @{
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*
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* @}
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*/
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/**
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* @addtogroup lavu_ver
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* @{
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*/
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/**
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* Return the LIBAVUTIL_VERSION_INT constant.
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*/
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unsigned avutil_version(void);
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/**
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* Return an informative version string. This usually is the actual release
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* version number or a git commit description. This string has no fixed format
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* and can change any time. It should never be parsed by code.
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*/
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const char *av_version_info(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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/**
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* @}
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*/
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/**
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* @addtogroup lavu_media Media Type
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* @brief Media Type
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*/
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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,
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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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};
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/**
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* Return a string describing the media_type enum, NULL if media_type
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* is unknown.
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*/
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const char *av_get_media_type_string(enum AVMediaType media_type);
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/**
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* @defgroup lavu_const Constants
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* @{
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*
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* @defgroup lavu_enc Encoding specific
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*
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* @note those definition should move to avcodec
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* @{
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*/
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#define FF_LAMBDA_SHIFT 7
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#define FF_LAMBDA_SCALE (1<<FF_LAMBDA_SHIFT)
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#define FF_QP2LAMBDA 118 ///< factor to convert from H.263 QP to lambda
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#define FF_LAMBDA_MAX (256*128-1)
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#define FF_QUALITY_SCALE FF_LAMBDA_SCALE //FIXME maybe remove
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/**
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* @}
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* @defgroup lavu_time Timestamp specific
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*
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* FFmpeg internal timebase and timestamp definitions
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*
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* @{
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*/
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/**
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* @brief Undefined timestamp value
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*
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* Usually reported by demuxer that work on containers that do not provide
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* either pts or dts.
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*/
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#define AV_NOPTS_VALUE ((int64_t)UINT64_C(0x8000000000000000))
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/**
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* Internal time base represented as integer
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*/
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#define AV_TIME_BASE 1000000
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/**
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* Internal time base represented as fractional value
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*/
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#define AV_TIME_BASE_Q (AVRational){1, AV_TIME_BASE}
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/**
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* @}
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* @}
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* @defgroup lavu_picture Image related
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*
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* AVPicture types, pixel formats and basic image planes manipulation.
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*
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* @{
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*/
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enum AVPictureType {
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AV_PICTURE_TYPE_NONE = 0, ///< Undefined
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AV_PICTURE_TYPE_I, ///< Intra
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AV_PICTURE_TYPE_P, ///< Predicted
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AV_PICTURE_TYPE_B, ///< Bi-dir predicted
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AV_PICTURE_TYPE_S, ///< S(GMC)-VOP MPEG-4
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AV_PICTURE_TYPE_SI, ///< Switching Intra
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AV_PICTURE_TYPE_SP, ///< Switching Predicted
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AV_PICTURE_TYPE_BI, ///< BI type
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};
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/**
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* Return a single letter to describe the given picture type
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* pict_type.
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*
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* @param[in] pict_type the picture type @return a single character
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* representing the picture type, '?' if pict_type is unknown
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*/
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char av_get_picture_type_char(enum AVPictureType pict_type);
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/**
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* @}
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*/
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#include "common.h"
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#include "error.h"
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#include "rational.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 "log.h"
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#include "pixfmt.h"
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/**
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* Return x default pointer in case p is NULL.
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*/
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static inline void *av_x_if_null(const void *p, const void *x)
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{
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return (void *)(intptr_t)(p ? p : x);
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}
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/**
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* Compute the length of an integer list.
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*
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* @param elsize size in bytes of each list element (only 1, 2, 4 or 8)
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* @param term list terminator (usually 0 or -1)
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* @param list pointer to the list
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* @return length of the list, in elements, not counting the terminator
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*/
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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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/**
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* Compute the length of an integer list.
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*
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* @param term list terminator (usually 0 or -1)
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* @param list pointer to the list
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* @return length of the list, in elements, not counting the terminator
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*/
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#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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/**
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* Open a file using a UTF-8 filename.
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* The API of this function matches POSIX fopen(), errors are returned through
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* errno.
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*/
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FILE *av_fopen_utf8(const char *path, const char *mode);
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/**
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* Return the fractional representation of the internal time base.
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*/
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AVRational av_get_time_base_q(void);
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/**
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* @}
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* @}
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*/
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#endif /* AVUTIL_AVUTIL_H */
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