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 @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 @ref lavr "libavresample" audio resampling, format conversion and mixing
43 * @li @subpage libswscale color conversion and scaling library
47 * @defgroup lavu Common utility functions
50 * libavutil contains the code shared across all the other Libav
53 * @note In order to use the functions provided by avutil you must include
54 * the specific header.
58 * @defgroup lavu_crypto Crypto and Hashing
63 * @defgroup lavu_math Maths
68 * @defgroup lavu_string String Manipulation
74 * @defgroup lavu_mem Memory Management
80 * @defgroup lavu_data Data Structures
85 * @defgroup lavu_audio Audio related
91 * @defgroup lavu_error Error Codes
97 * @defgroup lavu_misc Other
101 * @defgroup lavu_internal Internal
103 * Not exported functions, for internal usage only
112 * @defgroup preproc_misc Preprocessor String Macros
114 * String manipulation macros
119 #define AV_STRINGIFY(s) AV_TOSTRING(s)
120 #define AV_TOSTRING(s) #s
122 #define AV_GLUE(a, b) a ## b
123 #define AV_JOIN(a, b) AV_GLUE(a, b)
125 #define AV_PRAGMA(s) _Pragma(#s)
132 * @defgroup version_utils Library Version Macros
134 * Useful to check and match library version in order to maintain
135 * backward compatibility.
140 #define AV_VERSION_INT(a, b, c) (a<<16 | b<<8 | c)
141 #define AV_VERSION_DOT(a, b, c) a ##.## b ##.## c
142 #define AV_VERSION(a, b, c) AV_VERSION_DOT(a, b, c)
149 * @addtogroup lavu_ver
154 * Return the LIBAVUTIL_VERSION_INT constant.
156 unsigned avutil_version(void);
159 * Return the libavutil build-time configuration.
161 const char *avutil_configuration(void);
164 * Return the libavutil license.
166 const char *avutil_license(void);
173 * @addtogroup lavu_media Media Type
178 AVMEDIA_TYPE_UNKNOWN = -1, ///< Usually treated as AVMEDIA_TYPE_DATA
181 AVMEDIA_TYPE_DATA, ///< Opaque data information usually continuous
182 AVMEDIA_TYPE_SUBTITLE,
183 AVMEDIA_TYPE_ATTACHMENT, ///< Opaque data information usually sparse
188 * @defgroup lavu_const Constants
191 * @defgroup lavu_enc Encoding specific
193 * @note those definition should move to avcodec
197 #define FF_LAMBDA_SHIFT 7
198 #define FF_LAMBDA_SCALE (1<<FF_LAMBDA_SHIFT)
199 #define FF_QP2LAMBDA 118 ///< factor to convert from H.263 QP to lambda
200 #define FF_LAMBDA_MAX (256*128-1)
202 #define FF_QUALITY_SCALE FF_LAMBDA_SCALE //FIXME maybe remove
206 * @defgroup lavu_time Timestamp specific
208 * Libav internal timebase and timestamp definitions
214 * @brief Undefined timestamp value
216 * Usually reported by demuxer that work on containers that do not provide
220 #define AV_NOPTS_VALUE INT64_C(0x8000000000000000)
223 * Internal time base represented as integer
226 #define AV_TIME_BASE 1000000
229 * Internal time base represented as fractional value
232 #define AV_TIME_BASE_Q (AVRational){1, AV_TIME_BASE}
237 * @defgroup lavu_picture Image related
239 * AVPicture types, pixel formats and basic image planes manipulation.
245 AV_PICTURE_TYPE_I = 1, ///< Intra
246 AV_PICTURE_TYPE_P, ///< Predicted
247 AV_PICTURE_TYPE_B, ///< Bi-dir predicted
248 AV_PICTURE_TYPE_S, ///< S(GMC)-VOP MPEG4
249 AV_PICTURE_TYPE_SI, ///< Switching Intra
250 AV_PICTURE_TYPE_SP, ///< Switching Predicted
251 AV_PICTURE_TYPE_BI, ///< BI type
255 * Return a single letter to describe the given picture type
258 * @param[in] pict_type the picture type @return a single character
259 * representing the picture type, '?' if pict_type is unknown
261 char av_get_picture_type_char(enum AVPictureType pict_type);
275 #endif /* AVUTIL_AVUTIL_H */