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lavfi/vf_vpp_qsv: handle NULL pointer when evaluating an expression

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This patch provides default value if the expression is NULL.

This is in preparation for reusing the code for other QSV filters.

Signed-off-by: Haihao Xiang <haihao.xiang@intel.com>
This commit is contained in:
Haihao Xiang 2023-01-09 15:12:04 +08:00
parent 24a8e1e126
commit 129530e917
1 changed files with 20 additions and 16 deletions
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36
libavfilter/vf_vpp_qsv.c
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@ -172,14 +172,19 @@ enum var_name {
static int eval_expr(AVFilterContext *ctx)
{
#define PASS_EXPR(e, s) {\
ret = av_expr_parse(&e, s, var_names, NULL, NULL, NULL, NULL, 0, ctx); \
if (ret < 0) {\
av_log(ctx, AV_LOG_ERROR, "Error when passing '%s'.\n", s);\
goto release;\
if (s) {\
ret = av_expr_parse(&e, s, var_names, NULL, NULL, NULL, NULL, 0, ctx); \
if (ret < 0) { \
av_log(ctx, AV_LOG_ERROR, "Error when passing '%s'.\n", s); \
goto release; \
} \
}\
}
#define CALC_EXPR(e, v, i) {\
i = v = av_expr_eval(e, var_values, NULL); \
#define CALC_EXPR(e, v, i, d) {\
if (e)\
i = v = av_expr_eval(e, var_values, NULL); \
else\
i = v = d;\
}
VPPContext *vpp = ctx->priv;
double var_values[VAR_VARS_NB] = { NAN };
@ -209,30 +214,29 @@ static int eval_expr(AVFilterContext *ctx)
var_values[VAR_DAR] = var_values[VAR_A] * var_values[VAR_SAR];
/* crop params */
CALC_EXPR(cw_expr, var_values[VAR_CW], vpp->crop_w);
CALC_EXPR(ch_expr, var_values[VAR_CH], vpp->crop_h);
CALC_EXPR(cw_expr, var_values[VAR_CW], vpp->crop_w, var_values[VAR_IW]);
CALC_EXPR(ch_expr, var_values[VAR_CH], vpp->crop_h, var_values[VAR_IH]);
/* calc again in case cw is relative to ch */
CALC_EXPR(cw_expr, var_values[VAR_CW], vpp->crop_w);
CALC_EXPR(cw_expr, var_values[VAR_CW], vpp->crop_w, var_values[VAR_IW]);
CALC_EXPR(w_expr,
var_values[VAR_OUT_W] = var_values[VAR_OW] = var_values[VAR_W],
vpp->out_width);
vpp->out_width, var_values[VAR_CW]);
CALC_EXPR(h_expr,
var_values[VAR_OUT_H] = var_values[VAR_OH] = var_values[VAR_H],
vpp->out_height);
vpp->out_height, var_values[VAR_CH]);
/* calc again in case ow is relative to oh */
CALC_EXPR(w_expr,
var_values[VAR_OUT_W] = var_values[VAR_OW] = var_values[VAR_W],
vpp->out_width);
vpp->out_width, var_values[VAR_CW]);
CALC_EXPR(cx_expr, var_values[VAR_CX], vpp->crop_x);
CALC_EXPR(cy_expr, var_values[VAR_CY], vpp->crop_y);
CALC_EXPR(cx_expr, var_values[VAR_CX], vpp->crop_x, (var_values[VAR_IW] - var_values[VAR_OW]) / 2);
CALC_EXPR(cy_expr, var_values[VAR_CY], vpp->crop_y, (var_values[VAR_IH] - var_values[VAR_OH]) / 2);
/* calc again in case cx is relative to cy */
CALC_EXPR(cx_expr, var_values[VAR_CX], vpp->crop_x);
CALC_EXPR(cx_expr, var_values[VAR_CX], vpp->crop_x, (var_values[VAR_IW] - var_values[VAR_OW]) / 2);
if ((vpp->crop_w != var_values[VAR_IW]) || (vpp->crop_h != var_values[VAR_IH]))
vpp->use_crop = 1;