unit ffm.opt; {$i ffmpeg.inc} interface uses ffm.ctypes, ffm.rational; /// * // * AVOptions // * copyright (c) 2005 Michael Niedermayer // * // * This file is part of ffm. // * // * FFmpeg is free software; you can redistribute it and/or // * modify it under the terms of the GNU Lesser General Public // * License as published by the Free Software Foundation; either // * version 2.1 of the License, or (at your option) any later version. // * // * FFmpeg is distributed in the hope that it will be useful, // * but WITHOUT ANY WARRANTY; without even the implied warranty of // * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU // * Lesser General Public License for more details. // * // * You should have received a copy of the GNU Lesser General Public // * License along with FFmpeg; if not, write to the Free Software // * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA // */ // /// ** // * @file // * AVOptions // */ // // #include "rational.h" // #include "avutil.h" // #include "dict.h" // #include "log.h" // #include "pixfmt.h" // #include "samplefmt.h" // /// ** // * @defgroup avoptions AVOptions // * @ingroup lavu_data // * @{ // * AVOptions provide a generic system to declare options on arbitrary structs // * ("objects"). An option can have a help text, a type and a range of possible // * values. Options may then be enumerated, read and written to. // * // * @section avoptions_implement Implementing AVOptions // * This section describes how to add AVOptions capabilities to a struct. // * // * All AVOptions-related information is stored in an AVClass. Therefore // * the first member of the struct should be a pointer to an AVClass describing it. // * The option field of the AVClass must be set to a NULL-terminated static array // * of AVOptions. Each AVOption must have a non-empty name, a type, a default // * value and for number-type AVOptions also a range of allowed values. It must // * also declare an offset in bytes from the start of the struct, where the field // * associated with this AVOption is located. Other fields in the AVOption struct // * should also be set when applicable, but are not required. // * // * The following example illustrates an AVOptions-enabled struct: // * @code // * typedef struct test_struct { // * AVClass *class; // * int int_opt; // * char *str_opt; // * uint8_t *bin_opt; // * int bin_len; // * } test_struct; // * // * static const AVOption test_options[] = { // * { "test_int", "This is a test option of int type.", offsetof(test_struct, int_opt), // * AV_OPT_TYPE_INT, { .i64 = -1 }, INT_MIN, INT_MAX }, // * { "test_str", "This is a test option of string type.", offsetof(test_struct, str_opt), // * AV_OPT_TYPE_STRING }, // * { "test_bin", "This is a test option of binary type.", offsetof(test_struct, bin_opt), // * AV_OPT_TYPE_BINARY }, // * { NULL }, // * }; // * // * static const AVClass test_class = { // * .class_name = "test class", // * .item_name = av_default_item_name, // * .option = test_options, // * .version = LIBAVUTIL_VERSION_INT, // * }; // * @endcode // * // * Next, when allocating your struct, you must ensure that the AVClass pointer // * is set to the correct value. Then, av_opt_set_defaults() can be called to // * initialize defaults. After that the struct is ready to be used with the // * AVOptions API. // * // * When cleaning up, you may use the av_opt_free() function to automatically // * free all the allocated string and binary options. // * // * Continuing with the above example: // * // * @code // * test_struct *alloc_test_struct(void) // * { // * test_struct *ret = av_malloc(sizeof(*ret)); // * ret->class = &test_class; // * av_opt_set_defaults(ret); // * return ret; // * } // * void free_test_struct(test_struct **foo) // * { // * av_opt_free(*foo); // * av_freep(foo); // * } // * @endcode // * // * @subsection avoptions_implement_nesting Nesting // * It may happen that an AVOptions-enabled struct contains another // * AVOptions-enabled struct as a member (e.g. AVCodecContext in // * libavcodec exports generic options, while its priv_data field exports // * codec-specific options). In such a case, it is possible to set up the // * parent struct to export a child's options. To do that, simply // * implement AVClass.child_next() and AVClass.child_class_next() in the // * parent struct's AVClass. // * Assuming that the test_struct from above now also contains a // * child_struct field: // * // * @code // * typedef struct child_struct { // * AVClass *class; // * int flags_opt; // * } child_struct; // * static const AVOption child_opts[] = { // * { "test_flags", "This is a test option of flags type.", // * offsetof(child_struct, flags_opt), AV_OPT_TYPE_FLAGS, { .i64 = 0 }, INT_MIN, INT_MAX }, // * { NULL }, // * }; // * static const AVClass child_class = { // * .class_name = "child class", // * .item_name = av_default_item_name, // * .option = child_opts, // * .version = LIBAVUTIL_VERSION_INT, // * }; // * // * void *child_next(void *obj, void *prev) // * { // * test_struct *t = obj; // * if (!prev && t->child_struct) // * return t->child_struct; // * return NULL // * } // * const AVClass child_class_next(const AVClass *prev) // * { // * return prev ? NULL : &child_class; // * } // * @endcode // * Putting child_next() and child_class_next() as defined above into // * test_class will now make child_struct's options accessible through // * test_struct (again, proper setup as described above needs to be done on // * child_struct right after it is created). // * // * From the above example it might not be clear why both child_next() // * and child_class_next() are needed. The distinction is that child_next() // * iterates over actually existing objects, while child_class_next() // * iterates over all possible child classes. E.g. if an AVCodecContext // * was initialized to use a codec which has private options, then its // * child_next() will return AVCodecContext.priv_data and finish // * iterating. OTOH child_class_next() on AVCodecContext.av_class will // * iterate over all available codecs with private options. // * // * @subsection avoptions_implement_named_constants Named constants // * It is possible to create named constants for options. Simply set the unit // * field of the option the constants should apply to a string and // * create the constants themselves as options of type AV_OPT_TYPE_CONST // * with their unit field set to the same string. // * Their default_val field should contain the value of the named // * constant. // * For example, to add some named constants for the test_flags option // * above, put the following into the child_opts array: // * @code // * { "test_flags", "This is a test option of flags type.", // * offsetof(child_struct, flags_opt), AV_OPT_TYPE_FLAGS, { .i64 = 0 }, INT_MIN, INT_MAX, "test_unit" }, // * { "flag1", "This is a flag with value 16", 0, AV_OPT_TYPE_CONST, { .i64 = 16 }, 0, 0, "test_unit" }, // * @endcode // * // * @section avoptions_use Using AVOptions // * This section deals with accessing options in an AVOptions-enabled struct. // * Such structs in FFmpeg are e.g. AVCodecContext in libavcodec or // * AVFormatContext in libavformat. // * // * @subsection avoptions_use_examine Examining AVOptions // * The basic functions for examining options are av_opt_next(), which iterates // * over all options defined for one object, and av_opt_find(), which searches // * for an option with the given name. // * // * The situation is more complicated with nesting. An AVOptions-enabled struct // * may have AVOptions-enabled children. Passing the AV_OPT_SEARCH_CHILDREN flag // * to av_opt_find() will make the function search children recursively. // * // * For enumerating there are basically two cases. The first is when you want to // * get all options that may potentially exist on the struct and its children // * (e.g. when constructing documentation). In that case you should call // * av_opt_child_class_next() recursively on the parent struct's AVClass. The // * second case is when you have an already initialized struct with all its // * children and you want to get all options that can be actually written or read // * from it. In that case you should call av_opt_child_next() recursively (and // * av_opt_next() on each result). // * // * @subsection avoptions_use_get_set Reading and writing AVOptions // * When setting options, you often have a string read directly from the // * user. In such a case, simply passing it to av_opt_set() is enough. For // * non-string type options, av_opt_set() will parse the string according to the // * option type. // * // * Similarly av_opt_get() will read any option type and convert it to a string // * which will be returned. Do not forget that the string is allocated, so you // * have to free it with av_free(). // * // * In some cases it may be more convenient to put all options into an // * AVDictionary and call av_opt_set_dict() on it. A specific case of this // * are the format/codec open functions in lavf/lavc which take a dictionary // * filled with option as a parameter. This allows to set some options // * that cannot be set otherwise, since e.g. the input file format is not known // * before the file is actually opened. // */ Type TAVOptionType = ( { } AV_OPT_TYPE_FLAGS, { } AV_OPT_TYPE_INT, { } AV_OPT_TYPE_INT64, { } AV_OPT_TYPE_DOUBLE, { } AV_OPT_TYPE_FLOAT, { } AV_OPT_TYPE_STRING, { } AV_OPT_TYPE_RATIONAL, { } AV_OPT_TYPE_BINARY, // < offset must point to a pointer immediately followed by an int for the length { } AV_OPT_TYPE_CONST = 128, { } AV_OPT_TYPE_IMAGE_SIZE = $53495A45, // MKBETAG('S', 'I', 'Z', 'E'), // < offset must point to two consecutive integers { } AV_OPT_TYPE_PIXEL_FMT = $50464D54, // MKBETAG('P', 'F', 'M', 'T'), { } AV_OPT_TYPE_SAMPLE_FMT = $53464D54, // MKBETAG('S', 'F', 'M', 'T'), { } AV_OPT_TYPE_VIDEO_RATE = $56524154, // MKBETAG('V', 'R', 'A', 'T'), // < offset must point to AVRational { } AV_OPT_TYPE_DURATION = $44555220, // MKBETAG('D', 'U', 'R', ' '), { } AV_OPT_TYPE_COLOR = $434F4C52, // MKBETAG('C', 'O', 'L', 'R'), { } AV_OPT_TYPE_CHANNEL_LAYOUT = $43484C41 // MKBETAG('C', 'H', 'L', 'A'), {$IFDEF FF_API_OLD_AVOPTIONS} , { } FF_OPT_TYPE_FLAGS = 0, { } FF_OPT_TYPE_INT, { } FF_OPT_TYPE_INT64, { } FF_OPT_TYPE_DOUBLE, { } FF_OPT_TYPE_FLOAT, { } FF_OPT_TYPE_STRING, { } FF_OPT_TYPE_RATIONAL, { } FF_OPT_TYPE_BINARY, // < offset must point to a pointer immediately followed by an int for the length { } FF_OPT_TYPE_CONST = 128 {$ENDIF} ); Const AV_OPT_FLAG_ENCODING_PARAM = 1; /// < a generic parameter which can be set by the user for muxing or encoding AV_OPT_FLAG_DECODING_PARAM = 2; /// < a generic parameter which can be set by the user for demuxing or decoding AV_OPT_FLAG_METADATA = 4; /// < some data extracted or inserted into the file like title, comment, ... AV_OPT_FLAG_AUDIO_PARAM = 8; AV_OPT_FLAG_VIDEO_PARAM = 16; AV_OPT_FLAG_SUBTITLE_PARAM = 32; AV_OPT_FLAG_FILTERING_PARAM = (1 shl 16); /// < a generic parameter which can be set by the user for filtering /// Type (* * AVOption *) pAVOption = ^TAVOption; TAVOption = { packed } record name: pAnsiChar; (* * short English help text * @todo What about other languages? *) help: pAnsiChar; (* * The offset relative to the context structure where the option * value is stored. It should be 0 for named constants. *) offset: Integer; _type: TAVOptionType; (* * the default value for scalar options *) default_val: record case cint of 0: (i64: cint64); 1: (dbl: cdouble); 2: (str: pAnsiChar); (* TODO those are unused now *) 3: (q: TAVRational); end; min: double; /// < minimum valid value for the option max: double; /// < maximum valid value for the option flags: Integer; // FIXME think about enc-audio, ... style flags (* * The logical unit to which the option belongs. Non-constant * options and corresponding named constants share the same * unit. May be NULL. *) _unit: pAnsiChar; end; (* // * A single allowed range of values, or a single allowed value. *) pAVOptionRange = ^TAVOptionRange; ppAVOptionRange = ^pAVOptionRange; TAVOptionRange = { packed } record str: pAnsiChar; value_min, value_max: double; /// < For string ranges this represents the min/max length, for dimensions this represents the min/max pixel count component_min, component_max: double; /// < For string this represents the unicode range for chars, 0-127 limits to ASCII is_range: Integer; /// < if set to 1 the struct encodes a range, if set to 0 a single value end; (* // * List of AVOptionRange structs *) pAVOptionRanges = ^TAVOptionRanges; ppAVOptionRanges = ^pAVOptionRanges; TAVOptionRanges = { packed } record range: ppAVOptionRange; nb_ranges: Integer; end; // // #if FF_API_FIND_OPT (* // * Look for an option in obj. Look only for the options which // * have the flags set as specified in mask and flags (that is, // * for which it is the case that (opt->flags & mask) == flags). // * // * @param[in] obj a pointer to a struct whose first element is a // * pointer to an AVClass // * @param[in] name the name of the option to look for // * @param[in] unit the unit of the option to look for, or any if NULL // * @return a pointer to the option found, or NULL if no option // * has been found // * // * @deprecated use av_opt_find. *) // attribute_deprecated // const AVOption *av_find_opt(void *obj, const char *name, const char *unit, int mask, int flags); // #endif // // #if FF_API_OLD_AVOPTIONS (* // * Set the field of obj with the given name to value. // * // * @param[in] obj A struct whose first element is a pointer to an // * AVClass. // * @param[in] name the name of the field to set // * @param[in] val The value to set. If the field is not of a string // * type, then the given string is parsed. // * SI postfixes and some named scalars are supported. // * If the field is of a numeric type, it has to be a numeric or named // * scalar. Behavior with more than one scalar and +- infix operators // * is undefined. // * If the field is of a flags type, it has to be a sequence of numeric // * scalars or named flags separated by '+' or '-'. Prefixing a flag // * with '+' causes it to be set without affecting the other flags; // * similarly, '-' unsets a flag. // * @param[out] o_out if non-NULL put here a pointer to the AVOption // * found // * @param alloc this parameter is currently ignored // * @return 0 if the value has been set, or an AVERROR code in case of // * error: // * AVERROR_OPTION_NOT_FOUND if no matching option exists // * AVERROR(ERANGE) if the value is out of range // * AVERROR(EINVAL) if the value is not valid // * @deprecated use av_opt_set() *) // attribute_deprecated // int av_set_string3(void *obj, const char *name, const char *val, int alloc, const AVOption **o_out); // // attribute_deprecated const AVOption *av_set_double(void *obj, const char *name, double n); // attribute_deprecated const AVOption *av_set_q(void *obj, const char *name, AVRational n); // attribute_deprecated const AVOption *av_set_int(void *obj, const char *name, int64_t n); // // double av_get_double(void *obj, const char *name, const AVOption **o_out); // AVRational av_get_q(void *obj, const char *name, const AVOption **o_out); // int64_t av_get_int(void *obj, const char *name, const AVOption **o_out); // attribute_deprecated const char *av_get_string(void *obj, const char *name, const AVOption **o_out, char *buf, int buf_len); // attribute_deprecated const AVOption *av_next_option(void *obj, const AVOption *last); // #endif // (* // * Show the obj options. // * // * @param req_flags requested flags for the options to show. Show only the // * options for which it is opt->flags & req_flags. // * @param rej_flags rejected flags for the options to show. Show only the // * options for which it is !(opt->flags & req_flags). // * @param av_log_obj log context to use for showing the options *) // int av_opt_show2(void *obj, void *av_log_obj, int req_flags, int rej_flags); // (* // * Set the values of all AVOption fields to their default values. // * // * @param s an AVOption-enabled struct (its first member must be a pointer to AVClass) *) // void av_opt_set_defaults(void *s); // // #if FF_API_OLD_AVOPTIONS // attribute_deprecated // void av_opt_set_defaults2(void *s, int mask, int flags); // #endif // (* // * Parse the key/value pairs list in opts. For each key/value pair // * found, stores the value in the field in ctx that is named like the // * key. ctx must be an AVClass context, storing is done using // * AVOptions. // * // * @param opts options string to parse, may be NULL // * @param key_val_sep a 0-terminated list of characters used to // * separate key from value // * @param pairs_sep a 0-terminated list of characters used to separate // * two pairs from each other // * @return the number of successfully set key/value pairs, or a negative // * value corresponding to an AVERROR code in case of error: // * AVERROR(EINVAL) if opts cannot be parsed, // * the error code issued by av_set_string3() if a key/value pair // * cannot be set *) // int av_set_options_string(void *ctx, const char *opts, // const char *key_val_sep, const char *pairs_sep); // (* // * Parse the key-value pairs list in opts. For each key=value pair found, // * set the value of the corresponding option in ctx. // * // * @param ctx the AVClass object to set options on // * @param opts the options string, key-value pairs separated by a // * delimiter // * @param shorthand a NULL-terminated array of options names for shorthand // * notation: if the first field in opts has no key part, // * the key is taken from the first element of shorthand; // * then again for the second, etc., until either opts is // * finished, shorthand is finished or a named option is // * found; after that, all options must be named // * @param key_val_sep a 0-terminated list of characters used to separate // * key from value, for example '=' // * @param pairs_sep a 0-terminated list of characters used to separate // * two pairs from each other, for example ':' or ',' // * @return the number of successfully set key=value pairs, or a negative // * value corresponding to an AVERROR code in case of error: // * AVERROR(EINVAL) if opts cannot be parsed, // * the error code issued by av_set_string3() if a key/value pair // * cannot be set // * // * Options names must use only the following characters: a-z A-Z 0-9 - . / _ // * Separators must use characters distinct from option names and from each // * other. *) // int av_opt_set_from_string(void *ctx, const char *opts, // const char *const *shorthand, // const char *key_val_sep, const char *pairs_sep); (* // * Free all string and binary options in obj. *) // void av_opt_free(void *obj); // /// ** // * Check whether a particular flag is set in a flags field. // * // * @param field_name the name of the flag field option // * @param flag_name the name of the flag to check // * @return non-zero if the flag is set, zero if the flag isn't set, // * isn't of the right type, or the flags field doesn't exist. // */ // int av_opt_flag_is_set(void *obj, const char *field_name, const char *flag_name); // /// ** // * Set all the options from a given dictionary on an object. // * // * @param obj a struct whose first element is a pointer to AVClass // * @param options options to process. This dictionary will be freed and replaced // * by a new one containing all options not found in obj. // * Of course this new dictionary needs to be freed by caller // * with av_dict_free(). // * // * @return 0 on success, a negative AVERROR if some option was found in obj, // * but could not be set. // * // * @see av_dict_copy() // */ // int av_opt_set_dict(void *obj, struct AVDictionary **options); // /// ** // * Extract a key-value pair from the beginning of a string. // * // * @param ropts pointer to the options string, will be updated to // * point to the rest of the string (one of the pairs_sep // * or the final NUL) // * @param key_val_sep a 0-terminated list of characters used to separate // * key from value, for example '=' // * @param pairs_sep a 0-terminated list of characters used to separate // * two pairs from each other, for example ':' or ',' // * @param flags flags; see the AV_OPT_FLAG_* values below // * @param rkey parsed key; must be freed using av_free() // * @param rval parsed value; must be freed using av_free() // * // * @return >=0 for success, or a negative value corresponding to an // * AVERROR code in case of error; in particular: // * AVERROR(EINVAL) if no key is present // * // */ // int av_opt_get_key_value(const char **ropts, // const char *key_val_sep, const char *pairs_sep, // unsigned flags, // char **rkey, char **rval); // // enum { // // /** // * Accept to parse a value without a key; the key will then be returned // * as NULL. // */ // AV_OPT_FLAG_IMPLICIT_KEY = 1, // }; // /// ** // * @defgroup opt_eval_funcs Evaluating option strings // * @{ // * This group of functions can be used to evaluate option strings // * and get numbers out of them. They do the same thing as av_opt_set(), // * except the result is written into the caller-supplied pointer. // * // * @param obj a struct whose first element is a pointer to AVClass. // * @param o an option for which the string is to be evaluated. // * @param val string to be evaluated. // * @param *_out value of the string will be written here. // * // * @return 0 on success, a negative number on failure. // */ // int av_opt_eval_flags (void *obj, const AVOption *o, const char *val, int *flags_out); // int av_opt_eval_int (void *obj, const AVOption *o, const char *val, int *int_out); // int av_opt_eval_int64 (void *obj, const AVOption *o, const char *val, int64_t *int64_out); // int av_opt_eval_float (void *obj, const AVOption *o, const char *val, float *float_out); // int av_opt_eval_double(void *obj, const AVOption *o, const char *val, double *double_out); // int av_opt_eval_q (void *obj, const AVOption *o, const char *val, AVRational *q_out); const AV_OPT_SEARCH_CHILDREN = $0001; (* *< Search in possible children of the given object first. *) (* * The obj passed to av_opt_find() is fake -- only a double pointer to AVClass * instead of a required pointer to a struct containing AVClass. This is * useful for searching for options without needing to allocate the corresponding * object. *) // #define AV_OPT_SEARCH_FAKE_OBJ 0x0002 // /// ** // * Look for an option in an object. Consider only options which // * have all the specified flags set. // * // * @param[in] obj A pointer to a struct whose first element is a // * pointer to an AVClass. // * Alternatively a double pointer to an AVClass, if // * AV_OPT_SEARCH_FAKE_OBJ search flag is set. // * @param[in] name The name of the option to look for. // * @param[in] unit When searching for named constants, name of the unit // * it belongs to. // * @param opt_flags Find only options with all the specified flags set (AV_OPT_FLAG). // * @param search_flags A combination of AV_OPT_SEARCH_*. // * // * @return A pointer to the option found, or NULL if no option // * was found. // * // * @note Options found with AV_OPT_SEARCH_CHILDREN flag may not be settable // * directly with av_set_string3(). Use special calls which take an options // * AVDictionary (e.g. avformat_open_input()) to set options found with this // * flag. // */ // const AVOption *av_opt_find(void *obj, const char *name, const char *unit, // int opt_flags, int search_flags); // /// ** // * Look for an option in an object. Consider only options which // * have all the specified flags set. // * // * @param[in] obj A pointer to a struct whose first element is a // * pointer to an AVClass. // * Alternatively a double pointer to an AVClass, if // * AV_OPT_SEARCH_FAKE_OBJ search flag is set. // * @param[in] name The name of the option to look for. // * @param[in] unit When searching for named constants, name of the unit // * it belongs to. // * @param opt_flags Find only options with all the specified flags set (AV_OPT_FLAG). // * @param search_flags A combination of AV_OPT_SEARCH_*. // * @param[out] target_obj if non-NULL, an object to which the option belongs will be // * written here. It may be different from obj if AV_OPT_SEARCH_CHILDREN is present // * in search_flags. This parameter is ignored if search_flags contain // * AV_OPT_SEARCH_FAKE_OBJ. // * // * @return A pointer to the option found, or NULL if no option // * was found. // */ // const AVOption *av_opt_find2(void *obj, const char *name, const char *unit, // int opt_flags, int search_flags, void **target_obj); // /// ** // * Iterate over all AVOptions belonging to obj. // * // * @param obj an AVOptions-enabled struct or a double pointer to an // * AVClass describing it. // * @param prev result of the previous call to av_opt_next() on this object // * or NULL // * @return next AVOption or NULL // */ // const AVOption *av_opt_next(void *obj, const AVOption *prev); // /// ** // * Iterate over AVOptions-enabled children of obj. // * // * @param prev result of a previous call to this function or NULL // * @return next AVOptions-enabled child or NULL // */ // void *av_opt_child_next(void *obj, void *prev); // /// ** // * Iterate over potential AVOptions-enabled children of parent. // * // * @param prev result of a previous call to this function or NULL // * @return AVClass corresponding to next potential child or NULL // */ // const AVClass *av_opt_child_class_next(const AVClass *parent, const AVClass *prev); // /// ** // * @defgroup opt_set_funcs Option setting functions // * @{ // * Those functions set the field of obj with the given name to value. // * // * @param[in] obj A struct whose first element is a pointer to an AVClass. // * @param[in] name the name of the field to set // * @param[in] val The value to set. In case of av_opt_set() if the field is not // * of a string type, then the given string is parsed. // * SI postfixes and some named scalars are supported. // * If the field is of a numeric type, it has to be a numeric or named // * scalar. Behavior with more than one scalar and +- infix operators // * is undefined. // * If the field is of a flags type, it has to be a sequence of numeric // * scalars or named flags separated by '+' or '-'. Prefixing a flag // * with '+' causes it to be set without affecting the other flags; // * similarly, '-' unsets a flag. // * @param search_flags flags passed to av_opt_find2. I.e. if AV_OPT_SEARCH_CHILDREN // * is passed here, then the option may be set on a child of obj. // * // * @return 0 if the value has been set, or an AVERROR code in case of // * error: // * AVERROR_OPTION_NOT_FOUND if no matching option exists // * AVERROR(ERANGE) if the value is out of range // * AVERROR(EINVAL) if the value is not valid // */ // int av_opt_set (void *obj, const char *name, const char *val, int search_flags); // int av_opt_set_int (void *obj, const char *name, int64_t val, int search_flags); // int av_opt_set_double(void *obj, const char *name, double val, int search_flags); // int av_opt_set_q (void *obj, const char *name, AVRational val, int search_flags); // int av_opt_set_bin (void *obj, const char *name, const uint8_t *val, int size, int search_flags); function av_opt_set_bin(obj: Pointer; const name: pAnsiChar; const val: PByte; size: Integer; search_flags: Integer):Integer; cdecl; // int av_opt_set_image_size(void *obj, const char *name, int w, int h, int search_flags); // int av_opt_set_pixel_fmt (void *obj, const char *name, enum AVPixelFormat fmt, int search_flags); // int av_opt_set_sample_fmt(void *obj, const char *name, enum AVSampleFormat fmt, int search_flags); // int av_opt_set_video_rate(void *obj, const char *name, AVRational val, int search_flags); // int av_opt_set_channel_layout(void *obj, const char *name, int64_t ch_layout, int search_flags); // /// ** // * Set a binary option to an integer list. // * // * @param obj AVClass object to set options on // * @param name name of the binary option // * @param val pointer to an integer list (must have the correct type with // * regard to the contents of the list) // * @param term list terminator (usually 0 or -1) // * @param flags search flags // */ // #define av_opt_set_int_list(obj, name, val, term, flags) \ // (av_int_list_length(val, term) > INT_MAX / sizeof(*(val)) ? \ // AVERROR(EINVAL) : \ // av_opt_set_bin(obj, name, (const uint8_t *)(val), \ // av_int_list_length(val, term) * sizeof(*(val)), flags)) /// ** // * @} // */ // /// ** // * @defgroup opt_get_funcs Option getting functions // * @{ // * Those functions get a value of the option with the given name from an object. // * // * @param[in] obj a struct whose first element is a pointer to an AVClass. // * @param[in] name name of the option to get. // * @param[in] search_flags flags passed to av_opt_find2. I.e. if AV_OPT_SEARCH_CHILDREN // * is passed here, then the option may be found in a child of obj. // * @param[out] out_val value of the option will be written here // * @return >=0 on success, a negative error code otherwise // */ /// ** // * @note the returned string will be av_malloc()ed and must be av_free()ed by the caller // */ // int av_opt_get (void *obj, const char *name, int search_flags, uint8_t **out_val); // int av_opt_get_int (void *obj, const char *name, int search_flags, int64_t *out_val); // int av_opt_get_double(void *obj, const char *name, int search_flags, double *out_val); // int av_opt_get_q (void *obj, const char *name, int search_flags, AVRational *out_val); // int av_opt_get_image_size(void *obj, const char *name, int search_flags, int *w_out, int *h_out); // int av_opt_get_pixel_fmt (void *obj, const char *name, int search_flags, enum AVPixelFormat *out_fmt); // int av_opt_get_sample_fmt(void *obj, const char *name, int search_flags, enum AVSampleFormat *out_fmt); // int av_opt_get_video_rate(void *obj, const char *name, int search_flags, AVRational *out_val); // int av_opt_get_channel_layout(void *obj, const char *name, int search_flags, int64_t *ch_layout); /// ** // * @} // */ /// ** // * Gets a pointer to the requested field in a struct. // * This function allows accessing a struct even when its fields are moved or // * renamed since the application making the access has been compiled, // * // * @returns a pointer to the field, it can be cast to the correct type and read // * or written to. // */ // void *av_opt_ptr(const AVClass *avclass, void *obj, const char *name); // /// ** // * Free an AVOptionRanges struct and set it to NULL. // */ // void av_opt_freep_ranges(AVOptionRanges **ranges); // /// ** // * Get a list of allowed ranges for the given option. // * // * The returned list may depend on other fields in obj like for example profile. // * // * @param flags is a bitmask of flags, undefined flags should not be set and should be ignored // * AV_OPT_SEARCH_FAKE_OBJ indicates that the obj is a double pointer to a AVClass instead of a full instance // * // * The result must be freed with av_opt_freep_ranges. // * // * @return >= 0 on success, a negative errro code otherwise // */ // int av_opt_query_ranges(AVOptionRanges **, void *obj, const char *key, int flags); // /// ** // * Get a default list of allowed ranges for the given option. // * // * This list is constructed without using the AVClass.query_ranges() callback // * and can be used as fallback from within the callback. // * // * @param flags is a bitmask of flags, undefined flags should not be set and should be ignored // * AV_OPT_SEARCH_FAKE_OBJ indicates that the obj is a double pointer to a AVClass instead of a full instance // * // * The result must be freed with av_opt_free_ranges. // * // * @return >= 0 on success, a negative errro code otherwise // */ // int av_opt_query_ranges_default(AVOptionRanges **, void *obj, const char *key, int flags); // /// ** // * @} // */ implementation uses ffm.lib; function av_opt_set_bin; external avutil_dll; end.