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vf_idet: clean detected frame types based on a 4 frame history.

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-04-05 08:26:09 +02:00
parent c59e73d2c8
commit fa1f92a4f1
1 changed files with 28 additions and 3 deletions
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31
libavfilter/vf_idet.c
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@ -26,6 +26,8 @@
#undef NDEBUG
#include <assert.h>
#define HIST_SIZE 4
typedef enum {
TFF,
BFF,
@ -41,6 +43,8 @@ typedef struct {
Type prestat[4];
Type poststat[4];
uint8_t history[HIST_SIZE];
AVFilterBufferRef *cur;
AVFilterBufferRef *next;
AVFilterBufferRef *prev;
@ -91,7 +95,8 @@ static void filter(AVFilterContext *ctx)
int y, i;
int64_t alpha[2]={0};
int64_t delta=0;
Type type;
Type type, best_type;
int match = 0;
for (i = 0; i < idet->csp->nb_components; i++) {
int w = idet->cur->video->w;
@ -127,8 +132,27 @@ static void filter(AVFilterContext *ctx)
type = UNDETERMINED;
}
if (type != UNDETERMINED)
idet->last_type = type;
memmove(idet->history+1, idet->history, HIST_SIZE-1);
idet->history[0] = type;
best_type = UNDETERMINED;
for(i=0; i<HIST_SIZE; i++){
if(idet->history[i] != UNDETERMINED){
if(best_type == UNDETERMINED)
best_type = idet->history[i];
if(idet->history[i] == best_type) {
match++;
}else{
match=0;
break;
}
}
}
if(idet->last_type == UNDETERMINED){
if(match ) idet->last_type = best_type;
}else{
if(match>2) idet->last_type = best_type;
}
if (idet->last_type == TFF){
idet->cur->video->top_field_first = 1;
@ -281,6 +305,7 @@ static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
if (args) sscanf(args, "%f:%f", &idet->interlace_threshold, &idet->progressive_threshold);
idet->last_type = UNDETERMINED;
memset(idet->history, UNDETERMINED, HIST_SIZE);
idet->filter_line = filter_line_c;