212 lines
7.2 KiB
C
212 lines
7.2 KiB
C
/*
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* AVOptions
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* copyright (c) 2005 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 AVCODEC_OPT_H
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#define AVCODEC_OPT_H
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/**
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* @file libavcodec/opt.h
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* AVOptions
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*/
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#include "libavutil/rational.h"
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#include "avcodec.h"
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enum AVOptionType{
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FF_OPT_TYPE_FLAGS,
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FF_OPT_TYPE_INT,
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FF_OPT_TYPE_INT64,
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FF_OPT_TYPE_DOUBLE,
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FF_OPT_TYPE_FLOAT,
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FF_OPT_TYPE_STRING,
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FF_OPT_TYPE_RATIONAL,
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FF_OPT_TYPE_BINARY, ///< offset must point to a pointer immediately followed by an int for the length
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FF_OPT_TYPE_CONST=128,
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};
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/**
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* AVOption
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*/
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typedef struct AVOption {
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const char *name;
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/**
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* short English help text
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* @todo What about other languages?
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*/
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const char *help;
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/**
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* The offset relative to the context structure where the option
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* value is stored. It should be 0 for named constants.
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*/
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int offset;
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enum AVOptionType type;
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/**
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* the default value for scalar options
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*/
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double default_val;
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double min; ///< minimum valid value for the option
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double max; ///< maximum valid value for the option
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int flags;
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#define AV_OPT_FLAG_ENCODING_PARAM 1 ///< a generic parameter which can be set by the user for muxing or encoding
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#define AV_OPT_FLAG_DECODING_PARAM 2 ///< a generic parameter which can be set by the user for demuxing or decoding
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#define AV_OPT_FLAG_METADATA 4 ///< some data extracted or inserted into the file like title, comment, ...
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#define AV_OPT_FLAG_AUDIO_PARAM 8
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#define AV_OPT_FLAG_VIDEO_PARAM 16
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#define AV_OPT_FLAG_SUBTITLE_PARAM 32
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//FIXME think about enc-audio, ... style flags
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/**
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* The logical unit to which the option belongs. Non-constant
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* options and corresponding named constants share the same
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* unit. May be NULL.
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*/
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const char *unit;
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} AVOption;
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/**
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* AVOption2.
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* THIS IS NOT PART OF THE API/ABI YET!
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* This is identical to AVOption except that default_val was replaced by
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* an union, it should be compatible with AVOption on normal platforms.
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*/
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typedef struct AVOption2 {
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const char *name;
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/**
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* short English help text
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* @todo What about other languages?
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*/
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const char *help;
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/**
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* The offset relative to the context structure where the option
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* value is stored. It should be 0 for named constants.
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*/
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int offset;
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enum AVOptionType type;
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/**
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* the default value for scalar options
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*/
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union {
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double dbl;
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const char *str;
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} default_val;
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double min; ///< minimum valid value for the option
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double max; ///< maximum valid value for the option
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int flags;
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/*
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#define AV_OPT_FLAG_ENCODING_PARAM 1 ///< a generic parameter which can be set by the user for muxing or encoding
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#define AV_OPT_FLAG_DECODING_PARAM 2 ///< a generic parameter which can be set by the user for demuxing or decoding
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#define AV_OPT_FLAG_METADATA 4 ///< some data extracted or inserted into the file like title, comment, ...
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#define AV_OPT_FLAG_AUDIO_PARAM 8
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#define AV_OPT_FLAG_VIDEO_PARAM 16
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#define AV_OPT_FLAG_SUBTITLE_PARAM 32
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*/
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//FIXME think about enc-audio, ... style flags
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/**
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* The logical unit to which the option belongs. Non-constant
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* options and corresponding named constants share the same
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* unit. May be NULL.
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*/
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const char *unit;
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} AVOption2;
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/**
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* Looks for an option in obj. Looks only for the options which
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* have the flags set as specified in mask and flags (that is,
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* for which it is the case that opt->flags & mask == flags).
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*
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* @param[in] obj a pointer to a struct whose first element is a
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* pointer to an AVClass
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* @param[in] name the name of the option to look for
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* @param[in] unit the unit of the option to look for, or any if NULL
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* @return a pointer to the option found, or NULL if no option
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* has been found
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*/
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const AVOption *av_find_opt(void *obj, const char *name, const char *unit, int mask, int flags);
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#if LIBAVCODEC_VERSION_MAJOR < 53
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/**
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* @see av_set_string2()
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*/
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attribute_deprecated const AVOption *av_set_string(void *obj, const char *name, const char *val);
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/**
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* @return a pointer to the AVOption corresponding to the field set or
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* NULL if no matching AVOption exists, or if the value val is not
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* valid
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* @see av_set_string3()
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*/
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attribute_deprecated const AVOption *av_set_string2(void *obj, const char *name, const char *val, int alloc);
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#endif
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/**
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* Sets the field of obj with the given name to value.
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*
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* @param[in] obj A struct whose first element is a pointer to an
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* AVClass.
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* @param[in] name the name of the field to set
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* @param[in] val The value to set. If the field is not of a string
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* type, then the given string is parsed.
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* SI postfixes and some named scalars are supported.
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* If the field is of a numeric type, it has to be a numeric or named
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* scalar. Behavior with more than one scalar and +- infix operators
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* is undefined.
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* If the field is of a flags type, it has to be a sequence of numeric
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* scalars or named flags separated by '+' or '-'. Prefixing a flag
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* with '+' causes it to be set without affecting the other flags;
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* similarly, '-' unsets a flag.
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* @param[out] o_out if non-NULL put here a pointer to the AVOption
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* found
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* @param alloc when 1 then the old value will be av_freed() and the
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* new av_strduped()
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* when 0 then no av_free() nor av_strdup() will be used
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* @return 0 if the value has been set, or an AVERROR code in case of
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* error:
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* AVERROR(ENOENT) if no matching option exists
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* AVERROR(ERANGE) if the value is out of range
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* AVERROR(EINVAL) if the value is not valid
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*/
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int av_set_string3(void *obj, const char *name, const char *val, int alloc, const AVOption **o_out);
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const AVOption *av_set_double(void *obj, const char *name, double n);
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const AVOption *av_set_q(void *obj, const char *name, AVRational n);
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const AVOption *av_set_int(void *obj, const char *name, int64_t n);
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double av_get_double(void *obj, const char *name, const AVOption **o_out);
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AVRational av_get_q(void *obj, const char *name, const AVOption **o_out);
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int64_t av_get_int(void *obj, const char *name, const AVOption **o_out);
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const char *av_get_string(void *obj, const char *name, const AVOption **o_out, char *buf, int buf_len);
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const AVOption *av_next_option(void *obj, const AVOption *last);
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int av_opt_show(void *obj, void *av_log_obj);
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void av_opt_set_defaults(void *s);
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void av_opt_set_defaults2(void *s, int mask, int flags);
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#endif /* AVCODEC_OPT_H */
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