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Code Issues Releases Activity

Fix start_frame handling in detelecine filter

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Signed-off-by: Benjamin Steffes <benjaminst123@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Benjamin Steffes 2016-03-17 23:10:00 +01:00 committed by Michael Niedermayer
parent be482e5165
commit c411e90bc3
1 changed files with 12 additions and 1 deletions
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13
libavfilter/vf_detelecine.c
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@ -37,6 +37,7 @@ typedef struct {
int first_field;
char *pattern;
int start_frame;
int init_len;
unsigned int pattern_pos;
unsigned int nskip_fields;
int64_t start_time;
@ -74,6 +75,7 @@ static av_cold int init(AVFilterContext *ctx)
DetelecineContext *s = ctx->priv;
const char *p;
int max = 0;
int sum = 0;
if (!strlen(s->pattern)) {
av_log(ctx, AV_LOG_ERROR, "No pattern provided.\n");
@ -86,14 +88,21 @@ static av_cold int init(AVFilterContext *ctx)
return AVERROR_INVALIDDATA;
}
sum += *p - '0';
max = FFMAX(*p - '0', max);
s->pts.num += *p - '0';
s->pts.den += 2;
}
if (s->start_frame >= sum) {
av_log(ctx, AV_LOG_ERROR, "Provided start_frame is too big.\n");
return AVERROR_INVALIDDATA;
}
s->nskip_fields = 0;
s->pattern_pos = 0;
s->start_time = AV_NOPTS_VALUE;
s->init_len = 0;
if (s->start_frame != 0) {
int nfields = 0;
@ -101,7 +110,7 @@ static av_cold int init(AVFilterContext *ctx)
nfields += *p - '0';
s->pattern_pos++;
if (nfields >= 2*s->start_frame) {
s->nskip_fields = nfields - 2*s->start_frame;
s->init_len = nfields - 2*s->start_frame;
break;
}
}
@ -211,6 +220,8 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
}
if (s->nskip_fields == 0) {
len = s->init_len;
s->init_len = 0;
while(!len && s->pattern[s->pattern_pos]) {
len = s->pattern[s->pattern_pos] - '0';
s->pattern_pos++;