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Change eval API to take parent log context and log level offset.

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this is based on stefanos work, especially all bugs are his fault ;)

Originally committed as revision 23201 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2010-05-19 22:55:29 +00:00
parent 4880cfd952
commit 2b65bb45b5
4 changed files with 30 additions and 23 deletions
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30
libavcodec/eval.c
View File

@ -30,6 +30,7 @@
#include "eval.h"
typedef struct Parser{
const AVClass *class;
int stack_index;
char *s;
const double *const_value;
@ -39,11 +40,14 @@ typedef struct Parser{
double (* const *func2)(void *, double a, double b); // NULL terminated
const char * const *func2_name; // NULL terminated
void *opaque;
const char **error;
int log_offset;
void *log_ctx;
#define VARS 10
double var[VARS];
} Parser;
static const AVClass class = { "Eval", av_default_item_name, NULL, LIBAVUTIL_VERSION_INT, offsetof(Parser,log_offset), offsetof(Parser,log_ctx) };
static const int8_t si_prefixes['z' - 'E' + 1]={
['y'-'E']= -24,
['z'-'E']= -21,
@ -201,7 +205,7 @@ static AVExpr * parse_primary(Parser *p) {
p->s= strchr(p->s, '(');
if(p->s==NULL){
*p->error = "undefined constant or missing (";
av_log(p, AV_LOG_ERROR, "undefined constant or missing (\n");
p->s= next;
ff_free_expr(d);
return NULL;
@ -211,7 +215,7 @@ static AVExpr * parse_primary(Parser *p) {
av_freep(&d);
d = parse_expr(p);
if(p->s[0] != ')'){
*p->error = "missing )";
av_log(p, AV_LOG_ERROR, "missing )\n");
ff_free_expr(d);
return NULL;
}
@ -224,7 +228,7 @@ static AVExpr * parse_primary(Parser *p) {
d->param[1] = parse_expr(p);
}
if(p->s[0] != ')'){
*p->error = "missing )";
av_log(p, AV_LOG_ERROR, "missing )\n");
ff_free_expr(d);
return NULL;
}
@ -273,7 +277,7 @@ static AVExpr * parse_primary(Parser *p) {
}
}
*p->error = "unknown function";
av_log(p, AV_LOG_ERROR, "unknown function\n");
ff_free_expr(d);
return NULL;
}
@ -373,7 +377,8 @@ AVExpr *ff_parse_expr(const char *s,
const char * const *const_name,
const char * const *func1_name, double (* const *func1)(void *, double),
const char * const *func2_name, double (* const *func2)(void *, double, double),
const char **error){
int log_offset, void *log_ctx)
{
Parser p;
AVExpr *e = NULL;
char *w = av_malloc(strlen(s) + 1);
@ -386,6 +391,7 @@ AVExpr *ff_parse_expr(const char *s,
if (!isspace(*s++)) *wp++ = s[-1];
*wp++ = 0;
p.class = &class;
p.stack_index=100;
p.s= w;
p.const_name = const_name;
@ -393,7 +399,8 @@ AVExpr *ff_parse_expr(const char *s,
p.func1_name = func1_name;
p.func2 = func2;
p.func2_name = func2_name;
p.error= error;
p.log_offset = log_offset;
p.log_ctx = log_ctx;
e = parse_expr(&p);
if (!verify_expr(e)) {
@ -417,8 +424,9 @@ double ff_parse_and_eval_expr(const char *s,
const char * const *const_name, const double *const_value,
const char * const *func1_name, double (* const *func1)(void *, double),
const char * const *func2_name, double (* const *func2)(void *, double, double),
void *opaque, const char **error){
AVExpr *e = ff_parse_expr(s, const_name, func1_name, func1, func2_name, func2, error);
void *opaque, int log_offset, void *log_ctx)
{
AVExpr *e = ff_parse_expr(s, const_name, func1_name, func1, func2_name, func2, log_offset, log_ctx);
double d;
if (!e) return NAN;
d = ff_eval_expr(e, const_value, opaque);
@ -440,12 +448,12 @@ static const char *const_names[]={
};
int main(void){
int i;
printf("%f == 12.7\n", ff_parse_and_eval_expr("1+(5-2)^(3-1)+1/2+sin(PI)-max(-2.2,-3.1)", const_names, const_values, NULL, NULL, NULL, NULL, NULL, NULL));
printf("%f == 12.7\n", ff_parse_and_eval_expr("1+(5-2)^(3-1)+1/2+sin(PI)-max(-2.2,-3.1)", const_names, const_values, NULL, NULL, NULL, NULL, NULL, 0, NULL));
printf("%f == 0.931322575\n", ff_parse_and_eval_expr("80G/80Gi", const_names, const_values, NULL, NULL, NULL, NULL, NULL, NULL));
for(i=0; i<1050; i++){
START_TIMER
ff_parse_and_eval_expr("1+(5-2)^(3-1)+1/2+sin(PI)-max(-2.2,-3.1)", const_names, const_values, NULL, NULL, NULL, NULL, NULL, NULL);
ff_parse_and_eval_expr("1+(5-2)^(3-1)+1/2+sin(PI)-max(-2.2,-3.1)", const_names, const_values, NULL, NULL, NULL, NULL, NULL, 0, NULL);
STOP_TIMER("ff_parse_and_eval_expr")
}
return 0;

8
libavcodec/eval.h
View File

@ -39,15 +39,15 @@ typedef struct AVExpr AVExpr;
* @param func1 NULL terminated array of function pointers for functions which take 1 argument
* @param func2_name NULL terminated array of zero terminated strings of func2 identifers
* @param func2 NULL terminated array of function pointers for functions which take 2 arguments
* @param error pointer to a char* which is set to an error message if something goes wrong
* @param opaque a pointer which will be passed to all functions from func1 and func2
* @param log_ctx parent logging context
* @return the value of the expression
*/
double ff_parse_and_eval_expr(const char *s,
const char * const *const_name, const double *const_value,
const char * const *func1_name, double (* const *func1)(void *, double),
const char * const *func2_name, double (* const *func2)(void *, double, double),
void *opaque, const char **error);
void *opaque, int log_offset, void *log_ctx);
/**
* Parses an expression.
@ -58,7 +58,7 @@ double ff_parse_and_eval_expr(const char *s,
* @param func1 NULL terminated array of function pointers for functions which take 1 argument
* @param func2_name NULL terminated array of zero terminated strings of func2 identifers
* @param func2 NULL terminated array of function pointers for functions which take 2 arguments
* @param error pointer to a char* which is set to an error message if something goes wrong
* @param log_ctx parent logging context
* @return AVExpr which must be freed with ff_free_expr() by the user when it is not needed anymore
* NULL if anything went wrong
*/
@ -66,7 +66,7 @@ AVExpr *ff_parse_expr(const char *s,
const char * const *const_name,
const char * const *func1_name, double (* const *func1)(void *, double),
const char * const *func2_name, double (* const *func2)(void *, double, double),
const char **error);
int log_offset, void *log_ctx);
/**
* Evaluates a previously parsed expression.

10
libavcodec/opt.c
View File

@ -147,7 +147,6 @@ int av_set_string3(void *obj, const char *name, const char *val, int alloc, cons
char buf[256];
int cmd=0;
double d;
const char *error = NULL;
if(*val == '+' || *val == '-')
cmd= *(val++);
@ -156,8 +155,7 @@ int av_set_string3(void *obj, const char *name, const char *val, int alloc, cons
buf[i]= val[i];
buf[i]=0;
d = ff_parse_and_eval_expr(buf, const_names, const_values, NULL, NULL, NULL, NULL, NULL, &error);
if(isnan(d)) {
{
const AVOption *o_named= av_find_opt(obj, buf, o->unit, 0, 0);
if(o_named && o_named->type == FF_OPT_TYPE_CONST)
d= o_named->default_val;
@ -167,9 +165,11 @@ int av_set_string3(void *obj, const char *name, const char *val, int alloc, cons
else if(!strcmp(buf, "none" )) d= 0;
else if(!strcmp(buf, "all" )) d= ~0;
else {
if (error)
av_log(obj, AV_LOG_ERROR, "Unable to parse option value \"%s\": %s\n", val, error);
d = ff_parse_and_eval_expr(buf, const_names, const_values, NULL, NULL, NULL, NULL, NULL, 0, obj);
if (isnan(d)){
av_log(obj, AV_LOG_ERROR, "Unable to parse option value \"%s\"\n", val);
return AVERROR(EINVAL);
}
}
}
if(o->type == FF_OPT_TYPE_FLAGS){

5
libavcodec/ratecontrol.c
View File

@ -67,7 +67,6 @@ int ff_rate_control_init(MpegEncContext *s)
{
RateControlContext *rcc= &s->rc_context;
int i;
const char *error = NULL;
static const char * const const_names[]={
"PI",
"E",
@ -107,9 +106,9 @@ int ff_rate_control_init(MpegEncContext *s)
};
emms_c();
rcc->rc_eq_eval = ff_parse_expr(s->avctx->rc_eq ? s->avctx->rc_eq : "tex^qComp", const_names, func1_names, func1, NULL, NULL, &error);
rcc->rc_eq_eval = ff_parse_expr(s->avctx->rc_eq ? s->avctx->rc_eq : "tex^qComp", const_names, func1_names, func1, NULL, NULL, 0, s->avctx);
if (!rcc->rc_eq_eval) {
av_log(s->avctx, AV_LOG_ERROR, "Error parsing rc_eq \"%s\": %s\n", s->avctx->rc_eq, error? error : "");
av_log(s->avctx, AV_LOG_ERROR, "Error parsing rc_eq \"%s\"\n", s->avctx->rc_eq);
return -1;
}