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vf_crop: keepaspect support

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Baptiste Coudurier 2012-03-10 04:07:17 +01:00 committed by Michael Niedermayer
parent 84b9b4aa18
commit f49cb8e669
1 changed files with 13 additions and 1 deletions
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14
libavfilter/vf_crop.c
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@ -74,6 +74,9 @@ typedef struct {
int w; ///< width of the cropped area
int h; ///< height of the cropped area
AVRational out_sar; ///< output sample aspect ratio
int keep_aspect; ///< keep display aspect ratio when cropping
int max_step[4]; ///< max pixel step for each plane, expressed as a number of bytes
int hsub, vsub; ///< chroma subsampling
char x_expr[256], y_expr[256], ow_expr[256], oh_expr[256];
@ -124,7 +127,7 @@ static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
av_strlcpy(crop->y_expr, "(in_h-out_h)/2", sizeof(crop->y_expr));
if (args)
sscanf(args, "%255[^:]:%255[^:]:%255[^:]:%255[^:]", crop->ow_expr, crop->oh_expr, crop->x_expr, crop->y_expr);
sscanf(args, "%255[^:]:%255[^:]:%255[^:]:%255[^:]:%d", crop->ow_expr, crop->oh_expr, crop->x_expr, crop->y_expr, &crop->keep_aspect);
return 0;
}
@ -210,6 +213,14 @@ static int config_input(AVFilterLink *link)
NULL, NULL, NULL, NULL, 0, ctx)) < 0)
return AVERROR(EINVAL);
if (crop->keep_aspect) {
AVRational dar = av_mul_q(link->sample_aspect_ratio,
(AVRational){ link->w, link->h });
av_reduce(&crop->out_sar.num, &crop->out_sar.den,
dar.num * crop->h, dar.den * crop->w, INT_MAX);
} else
crop->out_sar = link->sample_aspect_ratio;
av_log(ctx, AV_LOG_INFO, "w:%d h:%d -> w:%d h:%d\n",
link->w, link->h, crop->w, crop->h);
@ -239,6 +250,7 @@ static int config_output(AVFilterLink *link)
link->w = crop->w;
link->h = crop->h;
link->sample_aspect_ratio = crop->out_sar;
return 0;
}