* video crop filter
*/
-/* #define DEBUG */
-
#include <stdio.h>
#include "avfilter.h"
VAR_VARS_NB
};
-typedef struct {
+typedef struct CropContext {
const AVClass *class;
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
static av_cold void uninit(AVFilterContext *ctx)
{
- CropContext *crop = ctx->priv;
+ CropContext *s = ctx->priv;
- av_expr_free(crop->x_pexpr); crop->x_pexpr = NULL;
- av_expr_free(crop->y_pexpr); crop->y_pexpr = NULL;
+ av_expr_free(s->x_pexpr);
+ s->x_pexpr = NULL;
+ av_expr_free(s->y_pexpr);
+ s->y_pexpr = NULL;
}
static inline int normalize_double(int *n, double d)
static int config_input(AVFilterLink *link)
{
AVFilterContext *ctx = link->dst;
- CropContext *crop = ctx->priv;
+ CropContext *s = ctx->priv;
const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(link->format);
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;
-
- av_image_fill_max_pixsteps(crop->max_step, NULL, pix_desc);
- crop->hsub = pix_desc->log2_chroma_w;
- crop->vsub = pix_desc->log2_chroma_h;
-
- if ((ret = av_expr_parse_and_eval(&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_expr_parse_and_eval(&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;
+ s->var_values[VAR_E] = M_E;
+ s->var_values[VAR_PHI] = M_PHI;
+ s->var_values[VAR_PI] = M_PI;
+ s->var_values[VAR_IN_W] = s->var_values[VAR_IW] = ctx->inputs[0]->w;
+ s->var_values[VAR_IN_H] = s->var_values[VAR_IH] = ctx->inputs[0]->h;
+ s->var_values[VAR_X] = NAN;
+ s->var_values[VAR_Y] = NAN;
+ s->var_values[VAR_OUT_W] = s->var_values[VAR_OW] = NAN;
+ s->var_values[VAR_OUT_H] = s->var_values[VAR_OH] = NAN;
+ s->var_values[VAR_N] = 0;
+ s->var_values[VAR_T] = NAN;
+
+ av_image_fill_max_pixsteps(s->max_step, NULL, pix_desc);
+ s->hsub = pix_desc->log2_chroma_w;
+ s->vsub = pix_desc->log2_chroma_h;
+
+ if ((ret = av_expr_parse_and_eval(&res, (expr = s->ow_expr),
+ var_names, s->var_values,
+ NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
+ goto fail_expr;
+ s->var_values[VAR_OUT_W] = s->var_values[VAR_OW] = res;
+ if ((ret = av_expr_parse_and_eval(&res, (expr = s->oh_expr),
+ var_names, s->var_values,
+ NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
+ goto fail_expr;
+ s->var_values[VAR_OUT_H] = s->var_values[VAR_OH] = res;
/* evaluate again ow as it may depend on oh */
- if ((ret = av_expr_parse_and_eval(&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) {
+ if ((ret = av_expr_parse_and_eval(&res, (expr = s->ow_expr),
+ var_names, s->var_values,
+ NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
+ goto fail_expr;
+
+ s->var_values[VAR_OUT_W] = s->var_values[VAR_OW] = res;
+ if (normalize_double(&s->w, s->var_values[VAR_OUT_W]) < 0 ||
+ normalize_double(&s->h, s->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);
+ s->ow_expr, s->oh_expr);
return AVERROR(EINVAL);
}
- crop->w &= ~((1 << crop->hsub) - 1);
- crop->h &= ~((1 << crop->vsub) - 1);
+ s->w &= ~((1 << s->hsub) - 1);
+ s->h &= ~((1 << s->vsub) - 1);
- if ((ret = av_expr_parse(&crop->x_pexpr, crop->x_expr, var_names,
+ av_expr_free(s->x_pexpr);
+ av_expr_free(s->y_pexpr);
+ s->x_pexpr = s->y_pexpr = NULL;
+ if ((ret = av_expr_parse(&s->x_pexpr, s->x_expr, var_names,
NULL, NULL, NULL, NULL, 0, ctx)) < 0 ||
- (ret = av_expr_parse(&crop->y_pexpr, crop->y_expr, var_names,
+ (ret = av_expr_parse(&s->y_pexpr, s->y_expr, var_names,
NULL, NULL, NULL, NULL, 0, ctx)) < 0)
return AVERROR(EINVAL);
av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d -> w:%d h:%d\n",
- link->w, link->h, crop->w, crop->h);
+ link->w, link->h, s->w, s->h);
- if (crop->w <= 0 || crop->h <= 0 ||
- crop->w > link->w || crop->h > link->h) {
+ if (s->w <= 0 || s->h <= 0 ||
+ s->w > link->w || s->h > link->h) {
av_log(ctx, AV_LOG_ERROR,
"Invalid too big or non positive size for width '%d' or height '%d'\n",
- crop->w, crop->h);
+ s->w, s->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);
+ s->x = (link->w - s->w) / 2;
+ s->y = (link->h - s->h) / 2;
+ s->x &= ~((1 << s->hsub) - 1);
+ s->y &= ~((1 << s->vsub) - 1);
return 0;
fail_expr:
static int config_output(AVFilterLink *link)
{
- CropContext *crop = link->src->priv;
+ CropContext *s = link->src->priv;
- link->w = crop->w;
- link->h = crop->h;
+ link->w = s->w;
+ link->h = s->h;
return 0;
}
static int filter_frame(AVFilterLink *link, AVFrame *frame)
{
AVFilterContext *ctx = link->dst;
- CropContext *crop = ctx->priv;
+ CropContext *s = ctx->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
int i;
- frame->width = crop->w;
- frame->height = crop->h;
+ frame->width = s->w;
+ frame->height = s->h;
- crop->var_values[VAR_T] = frame->pts == AV_NOPTS_VALUE ?
+ s->var_values[VAR_T] = frame->pts == AV_NOPTS_VALUE ?
NAN : frame->pts * av_q2d(link->time_base);
- crop->var_values[VAR_X] = av_expr_eval(crop->x_pexpr, crop->var_values, NULL);
- crop->var_values[VAR_Y] = av_expr_eval(crop->y_pexpr, crop->var_values, NULL);
- crop->var_values[VAR_X] = av_expr_eval(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_dlog(ctx, "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);
-
- frame->data[0] += crop->y * frame->linesize[0];
- frame->data[0] += crop->x * crop->max_step[0];
+ s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, NULL);
+ s->var_values[VAR_Y] = av_expr_eval(s->y_pexpr, s->var_values, NULL);
+ s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, NULL);
+
+ normalize_double(&s->x, s->var_values[VAR_X]);
+ normalize_double(&s->y, s->var_values[VAR_Y]);
+
+ if (s->x < 0)
+ s->x = 0;
+ if (s->y < 0)
+ s->y = 0;
+ if ((unsigned)s->x + (unsigned)s->w > link->w)
+ s->x = link->w - s->w;
+ if ((unsigned)s->y + (unsigned)s->h > link->h)
+ s->y = link->h - s->h;
+ s->x &= ~((1 << s->hsub) - 1);
+ s->y &= ~((1 << s->vsub) - 1);
+
+ av_log(ctx, AV_LOG_TRACE, "n:%d t:%f x:%d y:%d x+w:%d y+h:%d\n",
+ (int)s->var_values[VAR_N], s->var_values[VAR_T], s->x,
+ s->y, s->x+s->w, s->y+s->h);
+
+ frame->data[0] += s->y * frame->linesize[0];
+ frame->data[0] += s->x * s->max_step[0];
if (!(desc->flags & AV_PIX_FMT_FLAG_PAL || desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL)) {
for (i = 1; i < 3; i ++) {
if (frame->data[i]) {
- frame->data[i] += (crop->y >> crop->vsub) * frame->linesize[i];
- frame->data[i] += (crop->x * crop->max_step[i]) >> crop->hsub;
+ frame->data[i] += (s->y >> s->vsub) * frame->linesize[i];
+ frame->data[i] += (s->x * s->max_step[i]) >> s->hsub;
}
}
}
/* alpha plane */
if (frame->data[3]) {
- frame->data[3] += crop->y * frame->linesize[3];
- frame->data[3] += crop->x * crop->max_step[3];
+ frame->data[3] += s->y * frame->linesize[3];
+ frame->data[3] += s->x * s->max_step[3];
}
- crop->var_values[VAR_N] += 1.0;
+ s->var_values[VAR_N] += 1.0;
return ff_filter_frame(link->dst->outputs[0], frame);
}
{ NULL }
};
-AVFilter avfilter_vf_crop = {
+AVFilter ff_vf_crop = {
.name = "crop",
.description = NULL_IF_CONFIG_SMALL("Crop the input video to width:height:x:y."),
projects / ffmpeg / blobdiff