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@ -37,6 +37,7 @@ |
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#include "libavutil/libm.h" |
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#include "libavutil/imgutils.h" |
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#include "libavutil/mathematics.h" |
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#include "libavutil/opt.h" |
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static const char *const var_names[] = { |
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"E", |
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@ -70,6 +71,7 @@ enum var_name { |
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}; |
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typedef struct { |
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const AVClass *class; |
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int x; ///< x offset of the non-cropped area with respect to the input area
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int y; ///< y offset of the non-cropped area with respect to the input area
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int w; ///< width of the cropped area
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@ -77,7 +79,7 @@ typedef struct { |
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int max_step[4]; ///< max pixel step for each plane, expressed as a number of bytes
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int hsub, vsub; ///< chroma subsampling
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char x_expr[256], y_expr[256], ow_expr[256], oh_expr[256]; |
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char *x_expr, *y_expr, *ow_expr, *oh_expr; |
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AVExpr *x_pexpr, *y_pexpr; /* parsed expressions for x and y */ |
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double var_values[VAR_VARS_NB]; |
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} CropContext; |
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@ -115,21 +117,6 @@ static int query_formats(AVFilterContext *ctx) |
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return 0; |
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} |
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static av_cold int init(AVFilterContext *ctx, const char *args) |
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{ |
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CropContext *crop = ctx->priv; |
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av_strlcpy(crop->ow_expr, "iw", sizeof(crop->ow_expr)); |
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av_strlcpy(crop->oh_expr, "ih", sizeof(crop->oh_expr)); |
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av_strlcpy(crop->x_expr, "(in_w-out_w)/2", sizeof(crop->x_expr)); |
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av_strlcpy(crop->y_expr, "(in_h-out_h)/2", sizeof(crop->y_expr)); |
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if (args) |
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sscanf(args, "%255[^:]:%255[^:]:%255[^:]:%255[^:]", crop->ow_expr, crop->oh_expr, crop->x_expr, crop->y_expr); |
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return 0; |
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} |
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static av_cold void uninit(AVFilterContext *ctx) |
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{ |
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CropContext *crop = ctx->priv; |
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@ -294,6 +281,25 @@ static int filter_frame(AVFilterLink *link, AVFrame *frame) |
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return ff_filter_frame(link->dst->outputs[0], frame); |
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} |
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#define OFFSET(x) offsetof(CropContext, x) |
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM |
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static const AVOption options[] = { |
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{ "out_w", "Output video width", OFFSET(ow_expr), AV_OPT_TYPE_STRING, { .str = "iw" }, .flags = FLAGS }, |
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{ "out_h", "Output video height", OFFSET(oh_expr), AV_OPT_TYPE_STRING, { .str = "ih" }, .flags = FLAGS }, |
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{ "x", "Horizontal position in the input video of the left edge of the cropped output video", |
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OFFSET(x_expr), AV_OPT_TYPE_STRING, { .str = "(in_w - out_w) / 2" }, .flags = FLAGS }, |
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{ "y", "Vertical position in the input video of the top edge of the cropped output video", |
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OFFSET(y_expr), AV_OPT_TYPE_STRING, { .str = "(in_h - out_h) / 2" }, .flags = FLAGS }, |
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{ NULL }, |
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}; |
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static const AVClass crop_class = { |
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.class_name = "crop", |
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.item_name = av_default_item_name, |
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.option = options, |
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.version = LIBAVUTIL_VERSION_INT, |
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}; |
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static const AVFilterPad avfilter_vf_crop_inputs[] = { |
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{ |
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.name = "default", |
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@ -319,9 +325,9 @@ AVFilter avfilter_vf_crop = { |
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.description = NULL_IF_CONFIG_SMALL("Crop the input video to width:height:x:y."), |
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.priv_size = sizeof(CropContext), |
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.priv_class = &crop_class, |
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.query_formats = query_formats, |
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.init = init, |
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.uninit = uninit, |
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.inputs = avfilter_vf_crop_inputs, |
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