2 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
4 * This file is part of FFmpeg.
6 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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 describe the usage of the different libraries
37 * @li @ref libavc "libavcodec" encoding/decoding library
38 * @li @subpage 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 @subpage libpostproc post processing library
43 * @li @subpage libswscale color conversion and scaling library
48 * @defgroup lavu Common utility functions
51 * libavutil contains the code shared across all the other FFmpeg
54 * @note In order to use the functions provided by avutil you must include
55 * the specific header.
59 * @defgroup lavu_crypto Crypto and Hashing
64 * @defgroup lavu_math Maths
69 * @defgroup lavu_string String Manipulation
75 * @defgroup lavu_mem Memory Management
81 * @defgroup lavu_data Data Structures
86 * @defgroup lavu_audio Audio related
92 * @defgroup lavu_error Error Codes
98 * @defgroup lavu_misc Other
102 * @defgroup lavu_internal Internal
104 * Not exported functions, for internal usage only
113 * @defgroup preproc_misc Preprocessor String Macros
115 * String manipulation macros
120 #define AV_STRINGIFY(s) AV_TOSTRING(s)
121 #define AV_TOSTRING(s) #s
123 #define AV_GLUE(a, b) a ## b
124 #define AV_JOIN(a, b) AV_GLUE(a, b)
126 #define AV_PRAGMA(s) _Pragma(#s)
133 * @defgroup version_utils Library Version Macros
135 * Useful to check and match library version in order to maintain
136 * backward compatibility.
141 #define AV_VERSION_INT(a, b, c) (a<<16 | b<<8 | c)
142 #define AV_VERSION_DOT(a, b, c) a ##.## b ##.## c
143 #define AV_VERSION(a, b, c) AV_VERSION_DOT(a, b, c)
148 * @defgroup lavu_ver Version and Build diagnostics
150 * Macros and function useful to check at compiletime and at runtime
151 * which version of libavutil is in use.
156 #define LIBAVUTIL_VERSION_MAJOR 51
157 #define LIBAVUTIL_VERSION_MINOR 34
158 #define LIBAVUTIL_VERSION_MICRO 100
160 #define LIBAVUTIL_VERSION_INT AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \
161 LIBAVUTIL_VERSION_MINOR, \
162 LIBAVUTIL_VERSION_MICRO)
163 #define LIBAVUTIL_VERSION AV_VERSION(LIBAVUTIL_VERSION_MAJOR, \
164 LIBAVUTIL_VERSION_MINOR, \
165 LIBAVUTIL_VERSION_MICRO)
166 #define LIBAVUTIL_BUILD LIBAVUTIL_VERSION_INT
168 #define LIBAVUTIL_IDENT "Lavu" AV_STRINGIFY(LIBAVUTIL_VERSION)
173 * @defgroup depr_guards Deprecation guards
174 * Those FF_API_* defines are not part of public API.
175 * They may change, break or disappear at any time.
177 * They are used mostly internally to mark code that will be removed
178 * on the next major version.
182 #ifndef FF_API_OLD_EVAL_NAMES
183 #define FF_API_OLD_EVAL_NAMES (LIBAVUTIL_VERSION_MAJOR < 52)
185 #ifndef FF_API_GET_BITS_PER_SAMPLE_FMT
186 #define FF_API_GET_BITS_PER_SAMPLE_FMT (LIBAVUTIL_VERSION_MAJOR < 52)
188 #ifndef FF_API_FIND_OPT
189 #define FF_API_FIND_OPT (LIBAVUTIL_VERSION_MAJOR < 52)
191 #ifndef FF_API_AV_FIFO_PEEK
192 #define FF_API_AV_FIFO_PEEK (LIBAVUTIL_VERSION_MAJOR < 52)
194 #ifndef FF_API_OLD_AVOPTIONS
195 #define FF_API_OLD_AVOPTIONS (LIBAVUTIL_VERSION_MAJOR < 52)
203 * @addtogroup lavu_ver
208 * Return the LIBAVUTIL_VERSION_INT constant.
210 unsigned avutil_version(void);
213 * Return the libavutil build-time configuration.
215 const char *avutil_configuration(void);
218 * Return the libavutil license.
220 const char *avutil_license(void);
227 * @addtogroup lavu_media Media Type
232 AVMEDIA_TYPE_UNKNOWN = -1, ///< Usually treated as AVMEDIA_TYPE_DATA
235 AVMEDIA_TYPE_DATA, ///< Opaque data information usually continuous
236 AVMEDIA_TYPE_SUBTITLE,
237 AVMEDIA_TYPE_ATTACHMENT, ///< Opaque data information usually sparse
242 * Return a string describing the media_type enum, NULL if media_type
245 const char *av_get_media_type_string(enum AVMediaType media_type);
248 * @defgroup lavu_const Constants
251 * @defgroup lavu_enc Encoding specific
253 * @note those definition should move to avcodec
257 #define FF_LAMBDA_SHIFT 7
258 #define FF_LAMBDA_SCALE (1<<FF_LAMBDA_SHIFT)
259 #define FF_QP2LAMBDA 118 ///< factor to convert from H.263 QP to lambda
260 #define FF_LAMBDA_MAX (256*128-1)
262 #define FF_QUALITY_SCALE FF_LAMBDA_SCALE //FIXME maybe remove
266 * @defgroup lavu_time Timestamp specific
268 * FFmpeg internal timebase and timestamp definitions
274 * @brief Undefined timestamp value
276 * Usually reported by demuxer that work on containers that do not provide
280 #define AV_NOPTS_VALUE INT64_C(0x8000000000000000)
283 * Internal time base represented as integer
286 #define AV_TIME_BASE 1000000
289 * Internal time base represented as fractional value
292 #define AV_TIME_BASE_Q (AVRational){1, AV_TIME_BASE}
297 * @defgroup lavu_picture Image related
299 * AVPicture types, pixel formats and basic image planes manipulation.
305 AV_PICTURE_TYPE_NONE = 0, ///< Undefined
306 AV_PICTURE_TYPE_I, ///< Intra
307 AV_PICTURE_TYPE_P, ///< Predicted
308 AV_PICTURE_TYPE_B, ///< Bi-dir predicted
309 AV_PICTURE_TYPE_S, ///< S(GMC)-VOP MPEG4
310 AV_PICTURE_TYPE_SI, ///< Switching Intra
311 AV_PICTURE_TYPE_SP, ///< Switching Predicted
312 AV_PICTURE_TYPE_BI, ///< BI type
316 * Return a single letter to describe the given picture type
319 * @param[in] pict_type the picture type @return a single character
320 * representing the picture type, '?' if pict_type is unknown
322 char av_get_picture_type_char(enum AVPictureType pict_type);
330 #include "mathematics.h"
331 #include "rational.h"
332 #include "intfloat_readwrite.h"
337 * Return x default pointer in case p is NULL.
339 static inline void *av_x_if_null(const void *p, const void *x)
341 return (void *)(intptr_t)(p ? p : x);
349 #endif /* AVUTIL_AVUTIL_H */