2 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
4 * This file is part of Libav.
6 * Libav is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * Libav is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #ifndef AVUTIL_AVUTIL_H
22 #define AVUTIL_AVUTIL_H
32 * @section libav_intro Introduction
34 * This document describes the usage of the different libraries
37 * @li @ref libavc "libavcodec" encoding/decoding library
38 * @li @ref lavfi "libavfilter" graph-based frame editing library
39 * @li @ref libavf "libavformat" I/O and muxing/demuxing library
40 * @li @ref lavd "libavdevice" special devices muxing/demuxing library
41 * @li @ref lavu "libavutil" common utility library
42 * @li @ref lavr "libavresample" audio resampling, format conversion and mixing
43 * @li @subpage libswscale color conversion and scaling library
45 * @section libav_versioning Versioning and compatibility
47 * Each of the Libav libraries contains a version.h header, which defines a
48 * major, minor and micro version number with the
49 * <em>LIBRARYNAME_VERSION_{MAJOR,MINOR,MICRO}</em> macros. The major version
50 * number is incremented with backward incompatible changes - e.g. removing
51 * parts of the public API, reordering public struct members, etc. The minor
52 * version number is incremented for backward compatible API changes or major
53 * new features - e.g. adding a new public function or a new decoder. The micro
54 * version number is incremented for smaller changes that a calling program
55 * might still want to check for - e.g. changing behavior in a previously
56 * unspecified situation.
58 * Libav guarantees backward API and ABI compatibility for each library as long
59 * as its major version number is unchanged. This means that no public symbols
60 * will be removed or renamed. Types and names of the public struct members and
61 * values of public macros and enums will remain the same (unless they were
62 * explicitly declared as not part of the public API). Documented behavior will
65 * In other words, any correct program that works with a given Libav snapshot
66 * should work just as well without any changes with any later snapshot with the
67 * same major versions. This applies to both rebuilding the program against new
68 * Libav versions or to replacing the dynamic Libav libraries that a program
71 * However, new public symbols may be added and new members may be appended to
72 * public structs whose size is not part of public ABI (most public structs in
73 * Libav). New macros and enum values may be added. Behavior in undocumented
74 * situations may change slightly (and be documented). All those are accompanied
75 * by an entry in doc/APIchanges and incrementing either the minor or micro
80 * @defgroup lavu Common utility functions
83 * libavutil contains the code shared across all the other Libav
86 * @note In order to use the functions provided by avutil you must include
87 * the specific header.
91 * @defgroup lavu_crypto Crypto and Hashing
96 * @defgroup lavu_math Maths
101 * @defgroup lavu_string String Manipulation
107 * @defgroup lavu_mem Memory Management
113 * @defgroup lavu_data Data Structures
118 * @defgroup lavu_audio Audio related
124 * @defgroup lavu_error Error Codes
130 * @defgroup lavu_log Logging Facility
136 * @defgroup lavu_misc Other
140 * @defgroup lavu_internal Internal
142 * Not exported functions, for internal usage only
151 * @defgroup preproc_misc Preprocessor String Macros
153 * String manipulation macros
158 #define AV_STRINGIFY(s) AV_TOSTRING(s)
159 #define AV_TOSTRING(s) #s
161 #define AV_GLUE(a, b) a ## b
162 #define AV_JOIN(a, b) AV_GLUE(a, b)
164 #define AV_PRAGMA(s) _Pragma(#s)
171 * @defgroup version_utils Library Version Macros
173 * Useful to check and match library version in order to maintain
174 * backward compatibility.
179 #define AV_VERSION_INT(a, b, c) (a<<16 | b<<8 | c)
180 #define AV_VERSION_DOT(a, b, c) a ##.## b ##.## c
181 #define AV_VERSION(a, b, c) AV_VERSION_DOT(a, b, c)
188 * @addtogroup lavu_ver
193 * Return the LIBAVUTIL_VERSION_INT constant.
195 unsigned avutil_version(void);
198 * Return the libavutil build-time configuration.
200 const char *avutil_configuration(void);
203 * Return the libavutil license.
205 const char *avutil_license(void);
212 * @addtogroup lavu_media Media Type
217 AVMEDIA_TYPE_UNKNOWN = -1, ///< Usually treated as AVMEDIA_TYPE_DATA
220 AVMEDIA_TYPE_DATA, ///< Opaque data information usually continuous
221 AVMEDIA_TYPE_SUBTITLE,
222 AVMEDIA_TYPE_ATTACHMENT, ///< Opaque data information usually sparse
227 * @defgroup lavu_const Constants
230 * @defgroup lavu_enc Encoding specific
232 * @note those definition should move to avcodec
236 #define FF_LAMBDA_SHIFT 7
237 #define FF_LAMBDA_SCALE (1<<FF_LAMBDA_SHIFT)
238 #define FF_QP2LAMBDA 118 ///< factor to convert from H.263 QP to lambda
239 #define FF_LAMBDA_MAX (256*128-1)
241 #define FF_QUALITY_SCALE FF_LAMBDA_SCALE //FIXME maybe remove
245 * @defgroup lavu_time Timestamp specific
247 * Libav internal timebase and timestamp definitions
253 * @brief Undefined timestamp value
255 * Usually reported by demuxer that work on containers that do not provide
259 #define AV_NOPTS_VALUE INT64_C(0x8000000000000000)
262 * Internal time base represented as integer
265 #define AV_TIME_BASE 1000000
268 * Internal time base represented as fractional value
271 #define AV_TIME_BASE_Q (AVRational){1, AV_TIME_BASE}
276 * @defgroup lavu_picture Image related
278 * AVPicture types, pixel formats and basic image planes manipulation.
284 AV_PICTURE_TYPE_I = 1, ///< Intra
285 AV_PICTURE_TYPE_P, ///< Predicted
286 AV_PICTURE_TYPE_B, ///< Bi-dir predicted
287 AV_PICTURE_TYPE_S, ///< S(GMC)-VOP MPEG4
288 AV_PICTURE_TYPE_SI, ///< Switching Intra
289 AV_PICTURE_TYPE_SP, ///< Switching Predicted
290 AV_PICTURE_TYPE_BI, ///< BI type
294 * Return a single letter to describe the given picture type
297 * @param[in] pict_type the picture type @return a single character
298 * representing the picture type, '?' if pict_type is unknown
300 char av_get_picture_type_char(enum AVPictureType pict_type);
314 #endif /* AVUTIL_AVUTIL_H */