*/
#include "avfilter.h"
+#include "libavutil/eval.h"
+#include "libavutil/avstring.h"
+#include "libavutil/libm.h"
#include "libavcore/imgutils.h"
+static const char *var_names[] = {
+ "E",
+ "PHI",
+ "PI",
+ "in_w", "iw", ///< width of the input video
+ "in_h", "ih", ///< height of the input video
+ "out_w", "ow", ///< width of the cropped video
+ "out_h", "oh", ///< height of the cropped video
+ "x",
+ "y",
+ "n", ///< number of frame
+ "pos", ///< position in the file
+ "t", ///< timestamp expressed in seconds
+ NULL
+};
+
+enum var_name {
+ VAR_E,
+ VAR_PHI,
+ VAR_PI,
+ VAR_IN_W, VAR_IW,
+ VAR_IN_H, VAR_IH,
+ VAR_OUT_W, VAR_OW,
+ VAR_OUT_H, VAR_OH,
+ VAR_X,
+ VAR_Y,
+ VAR_N,
+ VAR_POS,
+ VAR_T,
+ VAR_VARS_NB
+};
+
typedef struct {
int x; ///< x offset of the non-cropped area with respect to the input area
int y; ///< y offset of the non-cropped area with respect to the input area
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];
+ AVExpr *x_pexpr, *y_pexpr; /* parsed expressions for x and y */
+ double var_values[VAR_VARS_NB];
} CropContext;
static int query_formats(AVFilterContext *ctx)
{
CropContext *crop = ctx->priv;
+ av_strlcpy(crop->ow_expr, "iw", sizeof(crop->ow_expr));
+ av_strlcpy(crop->oh_expr, "ih", sizeof(crop->oh_expr));
+ av_strlcpy(crop->x_expr, "(in_w-out_w)/2", sizeof(crop->x_expr));
+ av_strlcpy(crop->y_expr, "(in_h-out_h)/2", sizeof(crop->y_expr));
+
if (args)
- sscanf(args, "%d:%d:%d:%d", &crop->x, &crop->y, &crop->w, &crop->h);
+ sscanf(args, "%255[^:]:%255[^:]:%255[^:]:%255[^:]", crop->ow_expr, crop->oh_expr, crop->x_expr, crop->y_expr);
return 0;
}
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ CropContext *crop = ctx->priv;
+
+ av_free_expr(crop->x_pexpr); crop->x_pexpr = NULL;
+ av_free_expr(crop->y_pexpr); crop->y_pexpr = NULL;
+}
+
+static inline int normalize_double(int *n, double d)
+{
+ int ret = 0;
+
+ if (isnan(d)) {
+ ret = AVERROR(EINVAL);
+ } else if (d > INT_MAX || d < INT_MIN) {
+ *n = d > INT_MAX ? INT_MAX : INT_MIN;
+ ret = AVERROR(EINVAL);
+ } else
+ *n = round(d);
+
+ return ret;
+}
+
static int config_input(AVFilterLink *link)
{
AVFilterContext *ctx = link->dst;
CropContext *crop = ctx->priv;
const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[link->format];
-
- av_fill_image_max_pixsteps(crop->max_step, NULL, pix_desc);
+ int ret;
+ const char *expr;
+ double res;
+
+ crop->var_values[VAR_E] = M_E;
+ crop->var_values[VAR_PHI] = M_PHI;
+ crop->var_values[VAR_PI] = M_PI;
+ crop->var_values[VAR_IN_W] = crop->var_values[VAR_IW] = ctx->inputs[0]->w;
+ crop->var_values[VAR_IN_H] = crop->var_values[VAR_IH] = ctx->inputs[0]->h;
+ crop->var_values[VAR_X] = NAN;
+ crop->var_values[VAR_Y] = NAN;
+ crop->var_values[VAR_OUT_W] = crop->var_values[VAR_OW] = NAN;
+ crop->var_values[VAR_OUT_H] = crop->var_values[VAR_OH] = NAN;
+ crop->var_values[VAR_N] = 0;
+ crop->var_values[VAR_T] = NAN;
+ crop->var_values[VAR_POS] = NAN;
+
+ av_image_fill_max_pixsteps(crop->max_step, NULL, pix_desc);
crop->hsub = av_pix_fmt_descriptors[link->format].log2_chroma_w;
crop->vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h;
- if (crop->w == 0)
- crop->w = link->w - crop->x;
- if (crop->h == 0)
- crop->h = link->h - crop->y;
-
- crop->x &= ~((1 << crop->hsub) - 1);
- crop->y &= ~((1 << crop->vsub) - 1);
+ if ((ret = av_parse_and_eval_expr(&res, (expr = crop->ow_expr),
+ var_names, crop->var_values,
+ NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) goto fail_expr;
+ crop->var_values[VAR_OUT_W] = crop->var_values[VAR_OW] = res;
+ if ((ret = av_parse_and_eval_expr(&res, (expr = crop->oh_expr),
+ var_names, crop->var_values,
+ NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) goto fail_expr;
+ crop->var_values[VAR_OUT_H] = crop->var_values[VAR_OH] = res;
+ /* evaluate again ow as it may depend on oh */
+ if ((ret = av_parse_and_eval_expr(&res, (expr = crop->ow_expr),
+ var_names, crop->var_values,
+ NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) goto fail_expr;
+ crop->var_values[VAR_OUT_W] = crop->var_values[VAR_OW] = res;
+ if (normalize_double(&crop->w, crop->var_values[VAR_OUT_W]) < 0 ||
+ normalize_double(&crop->h, crop->var_values[VAR_OUT_H]) < 0) {
+ av_log(ctx, AV_LOG_ERROR,
+ "Too big value or invalid expression for out_w/ow or out_h/oh. "
+ "Maybe the expression for out_w:'%s' or for out_h:'%s' is self-referencing.\n",
+ crop->ow_expr, crop->oh_expr);
+ return AVERROR(EINVAL);
+ }
+ crop->w &= ~((1 << crop->hsub) - 1);
+ crop->h &= ~((1 << crop->vsub) - 1);
- av_log(link->dst, AV_LOG_INFO, "x:%d y:%d w:%d h:%d\n",
- crop->x, crop->y, crop->w, crop->h);
+ if ((ret = av_parse_expr(&crop->x_pexpr, crop->x_expr, var_names,
+ NULL, NULL, NULL, NULL, 0, ctx)) < 0 ||
+ (ret = av_parse_expr(&crop->y_pexpr, crop->y_expr, var_names,
+ NULL, NULL, NULL, NULL, 0, ctx)) < 0)
+ return AVERROR(EINVAL);
- if (crop->x < 0 || crop->y < 0 ||
- crop->w <= 0 || crop->h <= 0 ||
- (unsigned)crop->x + (unsigned)crop->w > link->w ||
- (unsigned)crop->y + (unsigned)crop->h > link->h) {
+ if (crop->w <= 0 || crop->h <= 0 ||
+ crop->w > link->w || crop->h > link->h) {
av_log(ctx, AV_LOG_ERROR,
- "Output area %d:%d:%d:%d not within the input area 0:0:%d:%d or zero-sized\n",
- crop->x, crop->y, crop->w, crop->h, link->w, link->h);
+ "Invalid too big or non positive size for width '%d' or height '%d'\n",
+ crop->w, crop->h);
return AVERROR(EINVAL);
}
+ /* set default, required in the case the first computed value for x/y is NAN */
+ crop->x = (link->w - crop->w) / 2;
+ crop->y = (link->h - crop->h) / 2;
+ crop->x &= ~((1 << crop->hsub) - 1);
+ crop->y &= ~((1 << crop->vsub) - 1);
return 0;
+
+fail_expr:
+ av_log(NULL, AV_LOG_ERROR, "Error when evaluating the expression '%s'\n", expr);
+ return ret;
}
static int config_output(AVFilterLink *link)
static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
{
- CropContext *crop = link->dst->priv;
+ AVFilterContext *ctx = link->dst;
+ CropContext *crop = ctx->priv;
AVFilterBufferRef *ref2 = avfilter_ref_buffer(picref, ~0);
int i;
picref->video->w = crop->w;
picref->video->h = crop->h;
+ crop->var_values[VAR_T] = picref->pts == AV_NOPTS_VALUE ?
+ NAN : picref->pts * av_q2d(link->time_base);
+ crop->var_values[VAR_POS] = picref->pos == -1 ? NAN : picref->pos;
+ crop->var_values[VAR_X] = av_eval_expr(crop->x_pexpr, crop->var_values, NULL);
+ crop->var_values[VAR_Y] = av_eval_expr(crop->y_pexpr, crop->var_values, NULL);
+ crop->var_values[VAR_X] = av_eval_expr(crop->x_pexpr, crop->var_values, NULL);
+
+ normalize_double(&crop->x, crop->var_values[VAR_X]);
+ normalize_double(&crop->y, crop->var_values[VAR_Y]);
+
+ if (crop->x < 0) crop->x = 0;
+ if (crop->y < 0) crop->y = 0;
+ if ((unsigned)crop->x + (unsigned)crop->w > link->w) crop->x = link->w - crop->w;
+ if ((unsigned)crop->y + (unsigned)crop->h > link->h) crop->y = link->h - crop->h;
+ crop->x &= ~((1 << crop->hsub) - 1);
+ crop->y &= ~((1 << crop->vsub) - 1);
+
+ av_log(ctx, AV_LOG_DEBUG,
+ "n:%d t:%f x:%d y:%d x+w:%d y+h:%d\n",
+ (int)crop->var_values[VAR_N], crop->var_values[VAR_T], crop->x, crop->y, crop->x+crop->w, crop->y+crop->h);
+
ref2->data[0] += crop->y * ref2->linesize[0];
- ref2->data[0] += (crop->x * crop->max_step[0]);
+ ref2->data[0] += crop->x * crop->max_step[0];
if (!(av_pix_fmt_descriptors[link->format].flags & PIX_FMT_PAL)) {
for (i = 1; i < 3; i ++) {
/* alpha plane */
if (ref2->data[3]) {
ref2->data[3] += crop->y * ref2->linesize[3];
- ref2->data[3] += (crop->x * crop->max_step[3]);
+ ref2->data[3] += crop->x * crop->max_step[3];
}
avfilter_start_frame(link->dst->outputs[0], ref2);
avfilter_draw_slice(ctx->outputs[0], y - crop->y, h, slice_dir);
}
+static void end_frame(AVFilterLink *link)
+{
+ CropContext *crop = link->dst->priv;
+
+ crop->var_values[VAR_N] += 1.0;
+ avfilter_unref_buffer(link->cur_buf);
+ avfilter_end_frame(link->dst->outputs[0]);
+}
+
AVFilter avfilter_vf_crop = {
.name = "crop",
- .description = NULL_IF_CONFIG_SMALL("Crop the input video to x:y:width:height."),
+ .description = NULL_IF_CONFIG_SMALL("Crop the input video to width:height:x:y."),
.priv_size = sizeof(CropContext),
.query_formats = query_formats,
.init = init,
+ .uninit = uninit,
.inputs = (AVFilterPad[]) {{ .name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.start_frame = start_frame,
.draw_slice = draw_slice,
+ .end_frame = end_frame,
.get_video_buffer = avfilter_null_get_video_buffer,
.config_props = config_input, },
{ .name = NULL}},
projects / ffmpeg / blobdiff