/*
- * simple arithmetic expression evaluator
- *
* Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at>
*
* This file is part of FFmpeg.
*/
/**
- * @file eval.h
- * eval header.
+ * @file
+ * simple arithmetic expression evaluator
*/
-#ifndef FFMPEG_EVAL_H
-#define FFMPEG_EVAL_H
+#ifndef AVCODEC_EVAL_H
+#define AVCODEC_EVAL_H
-#if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
-/**
- * @deprecated Use ff_eval2 instead
- */
-double ff_eval(char *s, double *const_value, const char **const_name,
- double (**func1)(void *, double), const char **func1_name,
- double (**func2)(void *, double, double), char **func2_name,
- void *opaque);
-#endif
+typedef struct AVExpr AVExpr;
/**
* Parses and evaluates an expression.
- * Note, this is significantly slower than ff_parse_eval()
- * @param s expression as a zero terminated string for example "1+2^3+5*5+sin(2/3)"
- * @param func1 NULL terminated array of function pointers for functions which take 1 argument
- * @param func2 NULL terminated array of function pointers for functions which take 2 arguments
- * @param const_name NULL terminated array of zero terminated strings of constant identifers for example {"PI", "E", 0}
- * @param func1_name NULL terminated array of zero terminated strings of func1 identifers
- * @param func2_name NULL terminated array of zero terminated strings of func2 identifers
- * @param error pointer to a char* which is set to an error message if something goes wrong
- * @param const_value a zero terminated array of values for the identifers from const_name
- * @param opaque a pointer which will be passed to all functions from func1 and func2
- * @return the value of the expression
+ * Note, this is significantly slower than ff_eval_expr().
+ *
+ * @param res a pointer to a double where is put the result value of
+ * the expression, or NAN in case of error
+ * @param s expression as a zero terminated string, for example "1+2^3+5*5+sin(2/3)"
+ * @param const_names NULL terminated array of zero terminated strings of constant identifiers, for example {"PI", "E", 0}
+ * @param const_values a zero terminated array of values for the identifiers from const_names
+ * @param func1_names NULL terminated array of zero terminated strings of funcs1 identifiers
+ * @param funcs1 NULL terminated array of function pointers for functions which take 1 argument
+ * @param func2_names NULL terminated array of zero terminated strings of funcs2 identifiers
+ * @param funcs2 NULL terminated array of function pointers for functions which take 2 arguments
+ * @param opaque a pointer which will be passed to all functions from funcs1 and funcs2
+ * @param log_ctx parent logging context
+ * @return 0 in case of success, a negative value corresponding to an
+ * AVERROR code otherwise
*/
-double ff_eval2(char *s, double *const_value, const char **const_name,
- double (**func1)(void *, double), const char **func1_name,
- double (**func2)(void *, double, double), char **func2_name,
- void *opaque, const char **error);
-
-typedef struct ff_expr_s AVEvalExpr;
+int ff_parse_and_eval_expr(double *res, const char *s,
+ const char * const *const_names, const double *const_values,
+ const char * const *func1_names, double (* const *funcs1)(void *, double),
+ const char * const *func2_names, double (* const *funcs2)(void *, double, double),
+ void *opaque, int log_offset, void *log_ctx);
/**
- * Parses a expression.
- * @param s expression as a zero terminated string for example "1+2^3+5*5+sin(2/3)"
- * @param func1 NULL terminated array of function pointers for functions which take 1 argument
- * @param func2 NULL terminated array of function pointers for functions which take 2 arguments
- * @param const_name NULL terminated array of zero terminated strings of constant identifers for example {"PI", "E", 0}
- * @param func1_name NULL terminated array of zero terminated strings of func1 identifers
- * @param func2_name NULL terminated array of zero terminated strings of func2 identifers
- * @param error pointer to a char* which is set to an error message if something goes wrong
- * @return AVEvalExpr which must be freed with ff_eval_free by the user when it is not needed anymore
- * NULL if anything went wrong
+ * Parses an expression.
+ *
+ * @param expr a pointer where is put an AVExpr containing the parsed
+ * value in case of successfull parsing, or NULL otherwise.
+ * The pointed to AVExpr must be freed with ff_free_expr() by the user
+ * when it is not needed anymore.
+ * @param s expression as a zero terminated string, for example "1+2^3+5*5+sin(2/3)"
+ * @param const_names NULL terminated array of zero terminated strings of constant identifiers, for example {"PI", "E", 0}
+ * @param func1_names NULL terminated array of zero terminated strings of funcs1 identifiers
+ * @param funcs1 NULL terminated array of function pointers for functions which take 1 argument
+ * @param func2_names NULL terminated array of zero terminated strings of funcs2 identifiers
+ * @param funcs2 NULL terminated array of function pointers for functions which take 2 arguments
+ * @param log_ctx parent logging context
+ * @return 0 in case of success, a negative value corresponding to an
+ * AVERROR code otherwise
*/
-AVEvalExpr * ff_parse(char *s, const char **const_name,
- double (**func1)(void *, double), const char **func1_name,
- double (**func2)(void *, double, double), char **func2_name,
- const char **error);
+int ff_parse_expr(AVExpr **expr, const char *s,
+ const char * const *const_names,
+ const char * const *func1_names, double (* const *funcs1)(void *, double),
+ const char * const *func2_names, double (* const *funcs2)(void *, double, double),
+ int log_offset, void *log_ctx);
+
/**
* Evaluates a previously parsed expression.
- * @param const_value a zero terminated array of values for the identifers from ff_parse const_name
- * @param opaque a pointer which will be passed to all functions from func1 and func2
+ *
+ * @param const_values a zero terminated array of values for the identifiers from ff_parse() const_names
+ * @param opaque a pointer which will be passed to all functions from funcs1 and funcs2
* @return the value of the expression
*/
-double ff_parse_eval(AVEvalExpr * e, double *const_value, void *opaque);
-void ff_eval_free(AVEvalExpr * e);
+double ff_eval_expr(AVExpr *e, const double *const_values, void *opaque);
+
+/**
+ * Frees a parsed expression previously created with ff_parse_expr().
+ */
+void ff_free_expr(AVExpr *e);
+
+/**
+ * Parses the string in numstr and returns its value as a double. If
+ * the string is empty, contains only whitespaces, or does not contain
+ * an initial substring that has the expected syntax for a
+ * floating-point number, no conversion is performed. In this case,
+ * returns a value of zero and the value returned in tail is the value
+ * of numstr.
+ *
+ * @param numstr a string representing a number, may contain one of
+ * the International System number postfixes, for example 'K', 'M',
+ * 'G'. If 'i' is appended after the postfix, powers of 2 are used
+ * instead of powers of 10. The 'B' postfix multiplies the value for
+ * 8, and can be appended after another postfix or used alone. This
+ * allows using for example 'KB', 'MiB', 'G' and 'B' as postfix.
+ * @param tail if non-NULL puts here the pointer to the char next
+ * after the last parsed character
+ */
+double av_strtod(const char *numstr, char **tail);
-#endif /* FFMPEG_EVAL_H */
+#endif /* AVCODEC_EVAL_H */
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