rv34: move inverse transform functions to DSP context
[libav.git] / libavutil / opt.h
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1/*
2 * AVOptions
3 * copyright (c) 2005 Michael Niedermayer <michaelni@gmx.at>
4 *
2912e87a 5 * This file is part of Libav.
6ed04040 6 *
2912e87a 7 * Libav is free software; you can redistribute it and/or
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8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
2912e87a 12 * Libav is distributed in the hope that it will be useful,
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13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
2912e87a 18 * License along with Libav; if not, write to the Free Software
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19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22#ifndef AVUTIL_OPT_H
23#define AVUTIL_OPT_H
24
25/**
26 * @file
27 * AVOptions
28 */
29
30#include "rational.h"
31#include "avutil.h"
7e83e1c5 32#include "dict.h"
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33
34enum AVOptionType{
35 FF_OPT_TYPE_FLAGS,
36 FF_OPT_TYPE_INT,
37 FF_OPT_TYPE_INT64,
38 FF_OPT_TYPE_DOUBLE,
39 FF_OPT_TYPE_FLOAT,
40 FF_OPT_TYPE_STRING,
41 FF_OPT_TYPE_RATIONAL,
42 FF_OPT_TYPE_BINARY, ///< offset must point to a pointer immediately followed by an int for the length
43 FF_OPT_TYPE_CONST=128,
44};
45
46/**
47 * AVOption
48 */
49typedef struct AVOption {
50 const char *name;
51
52 /**
53 * short English help text
54 * @todo What about other languages?
55 */
56 const char *help;
57
58 /**
59 * The offset relative to the context structure where the option
60 * value is stored. It should be 0 for named constants.
61 */
62 int offset;
63 enum AVOptionType type;
64
65 /**
66 * the default value for scalar options
67 */
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68 union {
69 double dbl;
70 const char *str;
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71 /* TODO those are unused now */
72 int64_t i64;
73 AVRational q;
6ed04040 74 } default_val;
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75 double min; ///< minimum valid value for the option
76 double max; ///< maximum valid value for the option
77
78 int flags;
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79#define AV_OPT_FLAG_ENCODING_PARAM 1 ///< a generic parameter which can be set by the user for muxing or encoding
80#define AV_OPT_FLAG_DECODING_PARAM 2 ///< a generic parameter which can be set by the user for demuxing or decoding
81#define AV_OPT_FLAG_METADATA 4 ///< some data extracted or inserted into the file like title, comment, ...
82#define AV_OPT_FLAG_AUDIO_PARAM 8
83#define AV_OPT_FLAG_VIDEO_PARAM 16
84#define AV_OPT_FLAG_SUBTITLE_PARAM 32
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85//FIXME think about enc-audio, ... style flags
86
87 /**
88 * The logical unit to which the option belongs. Non-constant
89 * options and corresponding named constants share the same
90 * unit. May be NULL.
91 */
92 const char *unit;
b6675279 93} AVOption;
6ed04040 94
dc59ec5e 95#if FF_API_FIND_OPT
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96/**
97 * Look for an option in obj. Look only for the options which
98 * have the flags set as specified in mask and flags (that is,
99 * for which it is the case that opt->flags & mask == flags).
100 *
101 * @param[in] obj a pointer to a struct whose first element is a
102 * pointer to an AVClass
103 * @param[in] name the name of the option to look for
104 * @param[in] unit the unit of the option to look for, or any if NULL
105 * @return a pointer to the option found, or NULL if no option
106 * has been found
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107 *
108 * @deprecated use av_opt_find.
6ed04040 109 */
dc59ec5e 110attribute_deprecated
6ed04040 111const AVOption *av_find_opt(void *obj, const char *name, const char *unit, int mask, int flags);
dc59ec5e 112#endif
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113
114/**
115 * Set the field of obj with the given name to value.
116 *
117 * @param[in] obj A struct whose first element is a pointer to an
118 * AVClass.
119 * @param[in] name the name of the field to set
120 * @param[in] val The value to set. If the field is not of a string
121 * type, then the given string is parsed.
122 * SI postfixes and some named scalars are supported.
123 * If the field is of a numeric type, it has to be a numeric or named
124 * scalar. Behavior with more than one scalar and +- infix operators
125 * is undefined.
126 * If the field is of a flags type, it has to be a sequence of numeric
127 * scalars or named flags separated by '+' or '-'. Prefixing a flag
128 * with '+' causes it to be set without affecting the other flags;
129 * similarly, '-' unsets a flag.
130 * @param[out] o_out if non-NULL put here a pointer to the AVOption
131 * found
c8d787d2 132 * @param alloc this parameter is currently ignored
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133 * @return 0 if the value has been set, or an AVERROR code in case of
134 * error:
e955a682 135 * AVERROR_OPTION_NOT_FOUND if no matching option exists
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136 * AVERROR(ERANGE) if the value is out of range
137 * AVERROR(EINVAL) if the value is not valid
138 */
139int av_set_string3(void *obj, const char *name, const char *val, int alloc, const AVOption **o_out);
140
141const AVOption *av_set_double(void *obj, const char *name, double n);
142const AVOption *av_set_q(void *obj, const char *name, AVRational n);
143const AVOption *av_set_int(void *obj, const char *name, int64_t n);
144double av_get_double(void *obj, const char *name, const AVOption **o_out);
145AVRational av_get_q(void *obj, const char *name, const AVOption **o_out);
146int64_t av_get_int(void *obj, const char *name, const AVOption **o_out);
147const char *av_get_string(void *obj, const char *name, const AVOption **o_out, char *buf, int buf_len);
148const AVOption *av_next_option(void *obj, const AVOption *last);
149
150/**
151 * Show the obj options.
152 *
153 * @param req_flags requested flags for the options to show. Show only the
154 * options for which it is opt->flags & req_flags.
155 * @param rej_flags rejected flags for the options to show. Show only the
156 * options for which it is !(opt->flags & req_flags).
157 * @param av_log_obj log context to use for showing the options
158 */
159int av_opt_show2(void *obj, void *av_log_obj, int req_flags, int rej_flags);
160
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161/**
162 * Set the values of all AVOption fields to their default values.
163 *
164 * @param s an AVOption-enabled struct (its first member must be a pointer to AVClass)
165 */
6ed04040 166void av_opt_set_defaults(void *s);
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167
168#if FF_API_OLD_AVOPTIONS
169attribute_deprecated
6ed04040 170void av_opt_set_defaults2(void *s, int mask, int flags);
79eff913 171#endif
6ed04040 172
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173/**
174 * Parse the key/value pairs list in opts. For each key/value pair
175 * found, stores the value in the field in ctx that is named like the
176 * key. ctx must be an AVClass context, storing is done using
177 * AVOptions.
178 *
179 * @param key_val_sep a 0-terminated list of characters used to
180 * separate key from value
181 * @param pairs_sep a 0-terminated list of characters used to separate
182 * two pairs from each other
183 * @return the number of successfully set key/value pairs, or a negative
184 * value corresponding to an AVERROR code in case of error:
185 * AVERROR(EINVAL) if opts cannot be parsed,
186 * the error code issued by av_set_string3() if a key/value pair
187 * cannot be set
188 */
189int av_set_options_string(void *ctx, const char *opts,
190 const char *key_val_sep, const char *pairs_sep);
191
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192/**
193 * Free all string and binary options in obj.
194 */
195void av_opt_free(void *obj);
196
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197/**
198 * Check whether a particular flag is set in a flags field.
199 *
200 * @param field_name the name of the flag field option
201 * @param flag_name the name of the flag to check
202 * @return non-zero if the flag is set, zero if the flag isn't set,
203 * isn't of the right type, or the flags field doesn't exist.
204 */
205int av_opt_flag_is_set(void *obj, const char *field_name, const char *flag_name);
206
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207/*
208 * Set all the options from a given dictionary on an object.
209 *
210 * @param obj a struct whose first element is a pointer to AVClass
211 * @param options options to process. This dictionary will be freed and replaced
212 * by a new one containing all options not found in obj.
213 * Of course this new dictionary needs to be freed by caller
214 * with av_dict_free().
215 *
216 * @return 0 on success, a negative AVERROR if some option was found in obj,
217 * but could not be set.
218 *
219 * @see av_dict_copy()
220 */
221int av_opt_set_dict(void *obj, struct AVDictionary **options);
222
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223#define AV_OPT_SEARCH_CHILDREN 0x0001 /**< Search in possible children of the
224 given object first. */
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225/**
226 * The obj passed to av_opt_find() is fake -- only a double pointer to AVClass
227 * instead of a required pointer to a struct containing AVClass. This is
228 * useful for searching for options without needing to allocate the corresponding
229 * object.
230 */
231#define AV_OPT_SEARCH_FAKE_OBJ 0x0002
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232
233/**
234 * Look for an option in an object. Consider only options which
235 * have all the specified flags set.
236 *
237 * @param[in] obj A pointer to a struct whose first element is a
238 * pointer to an AVClass.
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239 * Alternatively a double pointer to an AVClass, if
240 * AV_OPT_SEARCH_FAKE_OBJ search flag is set.
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241 * @param[in] name The name of the option to look for.
242 * @param[in] unit When searching for named constants, name of the unit
243 * it belongs to.
244 * @param opt_flags Find only options with all the specified flags set (AV_OPT_FLAG).
245 * @param search_flags A combination of AV_OPT_SEARCH_*.
246 *
247 * @return A pointer to the option found, or NULL if no option
248 * was found.
249 *
250 * @note Options found with AV_OPT_SEARCH_CHILDREN flag may not be settable
251 * directly with av_set_string3(). Use special calls which take an options
252 * AVDictionary (e.g. avformat_open_input()) to set options found with this
253 * flag.
254 */
255const AVOption *av_opt_find(void *obj, const char *name, const char *unit,
256 int opt_flags, int search_flags);
257
6ed04040 258#endif /* AVUTIL_OPT_H */