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lavfi/lut: fix component -> rgba mapping

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This commit is contained in:
Stefano Sabatini 2012-05-31 10:11:09 +02:00
parent 8b0e173529
commit f3fea5bab1
1 changed files with 20 additions and 24 deletions
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44
libavfilter/vf_lut.c
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@ -60,7 +60,6 @@ typedef struct {
int hsub, vsub;
double var_values[VAR_VARS_NB];
int is_rgb, is_yuv;
int rgba_map[4];
int step;
int negate_alpha; /* only used by negate */
} LutContext;
@ -199,6 +198,7 @@ static int config_props(AVFilterLink *inlink)
AVFilterContext *ctx = inlink->dst;
LutContext *lut = ctx->priv;
const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[inlink->format];
int rgba_map[4]; /* component index -> RGBA color index map */
int min[4], max[4];
int val, comp, ret;
@ -232,54 +232,50 @@ static int config_props(AVFilterLink *inlink)
if (lut->is_rgb) {
switch (inlink->format) {
case PIX_FMT_ARGB: lut->rgba_map[A] = 0; lut->rgba_map[R] = 1; lut->rgba_map[G] = 2; lut->rgba_map[B] = 3; break;
case PIX_FMT_ABGR: lut->rgba_map[A] = 0; lut->rgba_map[B] = 1; lut->rgba_map[G] = 2; lut->rgba_map[R] = 3; break;
case PIX_FMT_ARGB: rgba_map[0] = A; rgba_map[1] = R; rgba_map[2] = G; rgba_map[3] = B; break;
case PIX_FMT_ABGR: rgba_map[0] = A; rgba_map[1] = B; rgba_map[2] = G; rgba_map[3] = R; break;
case PIX_FMT_RGBA:
case PIX_FMT_RGB24: lut->rgba_map[R] = 0; lut->rgba_map[G] = 1; lut->rgba_map[B] = 2; lut->rgba_map[A] = 3; break;
case PIX_FMT_RGB24: rgba_map[0] = R; rgba_map[1] = G; rgba_map[2] = B; rgba_map[3] = A; break;
case PIX_FMT_BGRA:
case PIX_FMT_BGR24: lut->rgba_map[B] = 0; lut->rgba_map[G] = 1; lut->rgba_map[R] = 2; lut->rgba_map[A] = 3; break;
case PIX_FMT_BGR24: rgba_map[0] = B; rgba_map[1] = G; rgba_map[2] = R; rgba_map[3] = A; break;
}
lut->step = av_get_bits_per_pixel(desc) >> 3;
}
for (comp = 0; comp < desc->nb_components; comp++) {
double res;
int tcomp;
if (lut->is_rgb) {
for (tcomp = 0; lut->rgba_map[tcomp] != comp; tcomp++)
;
} else
tcomp = comp;
int color = lut->is_rgb ? rgba_map[comp] : comp;
/* create the parsed expression */
ret = av_expr_parse(&lut->comp_expr[comp], lut->comp_expr_str[comp],
ret = av_expr_parse(&lut->comp_expr[color], lut->comp_expr_str[color],
var_names, funcs1_names, funcs1, NULL, NULL, 0, ctx);
if (ret < 0) {
av_log(ctx, AV_LOG_ERROR,
"Error when parsing the expression '%s' for the component %d.\n",
lut->comp_expr_str[comp], comp);
"Error when parsing the expression '%s' for the component %d and color %d.\n",
lut->comp_expr_str[comp], comp, color);
return AVERROR(EINVAL);
}
/* compute the lut */
lut->var_values[VAR_MAXVAL] = max[comp];
lut->var_values[VAR_MINVAL] = min[comp];
lut->var_values[VAR_MAXVAL] = max[color];
lut->var_values[VAR_MINVAL] = min[color];
for (val = 0; val < 256; val++) {
lut->var_values[VAR_VAL] = val;
lut->var_values[VAR_CLIPVAL] = av_clip(val, min[comp], max[comp]);
lut->var_values[VAR_CLIPVAL] = av_clip(val, min[color], max[color]);
lut->var_values[VAR_NEGVAL] =
av_clip(min[comp] + max[comp] - lut->var_values[VAR_VAL],
min[comp], max[comp]);
av_clip(min[color] + max[color] - lut->var_values[VAR_VAL],
min[color], max[color]);
res = av_expr_eval(lut->comp_expr[comp], lut->var_values, lut);
res = av_expr_eval(lut->comp_expr[color], lut->var_values, lut);
if (isnan(res)) {
av_log(ctx, AV_LOG_ERROR,
"Error when evaluating the expression '%s' for the value %d for the component #%d.\n",
lut->comp_expr_str[comp], val, comp);
"Error when evaluating the expression '%s' for the value %d for the component %d.\n",
lut->comp_expr_str[color], val, comp);
return AVERROR(EINVAL);
}
lut->lut[tcomp][val] = av_clip((int)res, min[comp], max[comp]);
av_log(ctx, AV_LOG_DEBUG, "val[%d][%d] = %d\n", comp, val, lut->lut[tcomp][val]);
lut->lut[comp][val] = av_clip((int)res, min[color], max[color]);
av_log(ctx, AV_LOG_DEBUG, "val[%d][%d] = %d\n", comp, val, lut->lut[comp][val]);
}
}