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Diffstat (limited to 'libavfilter/vf_crop.c')
-rw-r--r--libavfilter/vf_crop.c87
1 files changed, 52 insertions, 35 deletions
diff --git a/libavfilter/vf_crop.c b/libavfilter/vf_crop.c
index ec545b3d58..35bb3e699e 100644
--- a/libavfilter/vf_crop.c
+++ b/libavfilter/vf_crop.c
@@ -1,20 +1,20 @@
/*
* Copyright (c) 2007 Bobby Bingham
*
- * This file is part of Libav.
+ * This file is part of FFmpeg.
*
- * Libav is free software; you can redistribute it and/or
+ * FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
- * Libav is distributed in the hope that it will be useful,
+ * FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with Libav; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
@@ -40,13 +40,15 @@
#include "libavutil/opt.h"
static const char *const 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
+ "a",
+ "sar",
+ "dar",
+ "hsub",
+ "vsub",
"x",
"y",
"n", ///< number of frame
@@ -56,13 +58,15 @@ static const char *const var_names[] = {
};
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_A,
+ VAR_SAR,
+ VAR_DAR,
+ VAR_HSUB,
+ VAR_VSUB,
VAR_X,
VAR_Y,
VAR_N,
@@ -77,9 +81,12 @@ 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, *y_expr, *ow_expr, *oh_expr;
+ char *x_expr, *y_expr, *w_expr, *h_expr;
AVExpr *x_pexpr, *y_pexpr; /* parsed expressions for x and y */
double var_values[VAR_VARS_NB];
} CropContext;
@@ -149,11 +156,13 @@ static int config_input(AVFilterLink *link)
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_A] = (float) link->w / link->h;
+ crop->var_values[VAR_SAR] = link->sample_aspect_ratio.num ? av_q2d(link->sample_aspect_ratio) : 1;
+ crop->var_values[VAR_DAR] = crop->var_values[VAR_A] * crop->var_values[VAR_SAR];
+ crop->var_values[VAR_HSUB] = 1<<pix_desc->log2_chroma_w;
+ crop->var_values[VAR_VSUB] = 1<<pix_desc->log2_chroma_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;
@@ -165,16 +174,16 @@ static int config_input(AVFilterLink *link)
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),
+ if ((ret = av_expr_parse_and_eval(&res, (expr = crop->w_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),
+ if ((ret = av_expr_parse_and_eval(&res, (expr = crop->h_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_expr_parse_and_eval(&res, (expr = crop->ow_expr),
+ if ((ret = av_expr_parse_and_eval(&res, (expr = crop->w_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;
@@ -183,7 +192,7 @@ static int config_input(AVFilterLink *link)
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);
+ crop->w_expr, crop->h_expr);
return AVERROR(EINVAL);
}
crop->w &= ~((1 << crop->hsub) - 1);
@@ -195,8 +204,17 @@ static int config_input(AVFilterLink *link)
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);
+ 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_VERBOSE, "w:%d h:%d sar:%d/%d -> w:%d h:%d sar:%d/%d\n",
+ link->w, link->h, link->sample_aspect_ratio.num, link->sample_aspect_ratio.den,
+ crop->w, crop->h, crop->out_sar.num, crop->out_sar.den);
if (crop->w <= 0 || crop->h <= 0 ||
crop->w > link->w || crop->h > link->h) {
@@ -224,6 +242,7 @@ static int config_output(AVFilterLink *link)
link->w = crop->w;
link->h = crop->h;
+ link->sample_aspect_ratio = crop->out_sar;
return 0;
}
@@ -282,23 +301,20 @@ static int filter_frame(AVFilterLink *link, AVFrame *frame)
}
#define OFFSET(x) offsetof(CropContext, x)
-#define FLAGS AV_OPT_FLAG_VIDEO_PARAM
-static const AVOption options[] = {
- { "out_w", "Output video width", OFFSET(ow_expr), AV_OPT_TYPE_STRING, { .str = "iw" }, .flags = FLAGS },
- { "out_h", "Output video height", OFFSET(oh_expr), AV_OPT_TYPE_STRING, { .str = "ih" }, .flags = FLAGS },
- { "x", "Horizontal position in the input video of the left edge of the cropped output video",
- OFFSET(x_expr), AV_OPT_TYPE_STRING, { .str = "(in_w - out_w) / 2" }, .flags = FLAGS },
- { "y", "Vertical position in the input video of the top edge of the cropped output video",
- OFFSET(y_expr), AV_OPT_TYPE_STRING, { .str = "(in_h - out_h) / 2" }, .flags = FLAGS },
- { NULL },
+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
+
+static const AVOption crop_options[] = {
+ { "out_w", "set the width crop area expression", OFFSET(w_expr), AV_OPT_TYPE_STRING, {.str = "iw"}, CHAR_MIN, CHAR_MAX, FLAGS },
+ { "w", "set the width crop area expression", OFFSET(w_expr), AV_OPT_TYPE_STRING, {.str = "iw"}, CHAR_MIN, CHAR_MAX, FLAGS },
+ { "out_h", "set the height crop area expression", OFFSET(h_expr), AV_OPT_TYPE_STRING, {.str = "ih"}, CHAR_MIN, CHAR_MAX, FLAGS },
+ { "h", "set the height crop area expression", OFFSET(h_expr), AV_OPT_TYPE_STRING, {.str = "ih"}, CHAR_MIN, CHAR_MAX, FLAGS },
+ { "x", "set the x crop area expression", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str = "(in_w-out_w)/2"}, CHAR_MIN, CHAR_MAX, FLAGS },
+ { "y", "set the y crop area expression", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str = "(in_h-out_h)/2"}, CHAR_MIN, CHAR_MAX, FLAGS },
+ { "keep_aspect", "keep aspect ratio", OFFSET(keep_aspect), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS },
+ {NULL}
};
-static const AVClass crop_class = {
- .class_name = "crop",
- .item_name = av_default_item_name,
- .option = options,
- .version = LIBAVUTIL_VERSION_INT,
-};
+AVFILTER_DEFINE_CLASS(crop);
static const AVFilterPad avfilter_vf_crop_inputs[] = {
{
@@ -332,4 +348,5 @@ AVFilter avfilter_vf_crop = {
.inputs = avfilter_vf_crop_inputs,
.outputs = avfilter_vf_crop_outputs,
+ .priv_class = &crop_class,
};
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-20 08:39:36 +0000