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vfilter/vf_qp: Support evaluating expression per MB 

also add support for x/y/w/h parameters

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2015-03-28 15:18:58 +01:00
parent a8fb8f6112
commit 2856634c67
1 changed files with 27 additions and 3 deletions
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30
libavfilter/vf_qp.c
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@ -33,6 +33,7 @@ typedef struct QPContext {
char *qp_expr_str;
int8_t lut[257];
int h, qstride;
int evaluate_per_mb;
} QPContext;
#define OFFSET(x) offsetof(QPContext, x)
@ -52,7 +53,7 @@ static int config_input(AVFilterLink *inlink)
int i;
int ret;
AVExpr *e = NULL;
static const char *var_names[] = { "known", "qp", NULL };
static const char *var_names[] = { "known", "qp", "x", "y", "w", "h", NULL };
if (!s->qp_expr_str)
return 0;
@ -64,12 +65,16 @@ static int config_input(AVFilterLink *inlink)
s->h = (inlink->h + 15) >> 4;
s->qstride = (inlink->w + 15) >> 4;
for (i = -129; i < 128; i++) {
double var_values[] = { i != -129, i, 0};
double var_values[] = { i != -129, i, NAN, NAN, s->qstride, s->h, 0};
double temp_val = av_expr_eval(e, var_values, NULL);
if (isnan(temp_val)) {
if(strchr(s->qp_expr_str, 'x') || strchr(s->qp_expr_str, 'y'))
s->evaluate_per_mb = 1;
else {
av_expr_free(e);
return AVERROR(EINVAL);
}
}
s->lut[i + 129] = lrintf(temp_val);
@ -108,7 +113,26 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
in_qp_table = av_frame_get_qp_table(in, &stride, &type);
av_frame_set_qp_table(out, out_qp_table_buf, s->qstride, type);
if (in_qp_table) {
if (s->evaluate_per_mb) {
int y, x;
for (y = 0; y < s->h; y++)
for (x = 0; x < s->qstride; x++) {
int qp = in_qp_table ? in_qp_table[x + stride * y] : NAN;
double var_values[] = { !!in_qp_table, qp, x, y, s->qstride, s->h, 0};
static const char *var_names[] = { "known", "qp", "x", "y", "w", "h", NULL };
double temp_val;
int ret;
ret = av_expr_parse_and_eval(&temp_val, s->qp_expr_str,
var_names, var_values,
NULL, NULL, NULL, NULL, 0, 0, ctx);
if (ret < 0)
return ret;
out_qp_table_buf->data[x + s->qstride * y] = lrintf(temp_val);
}
} else if (in_qp_table) {
int y, x;
for (y = 0; y < s->h; y++)