X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavfilter%2Fvf_crop.c;h=4e794df91e05991fb13f038cfef91a1fc613568b;hb=cc8104b9086d2951a8c47601117275fadc70bc02;hp=f7d311a9a8b7fe0d158e0147c9a9c562cc884987;hpb=e9b992d035b58209d66115bd7d964741dd31d592;p=ffmpeg

diff --git a/libavfilter/vf_crop.c b/libavfilter/vf_crop.c
index f7d311a9a8b..4e794df91e0 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
  */
 
@@ -25,24 +25,29 @@
 
 /* #define DEBUG */
 
+#include <stdio.h>
+
 #include "avfilter.h"
 #include "formats.h"
 #include "internal.h"
 #include "video.h"
 #include "libavutil/eval.h"
 #include "libavutil/avstring.h"
+#include "libavutil/internal.h"
 #include "libavutil/libm.h"
 #include "libavutil/imgutils.h"
 #include "libavutil/mathematics.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
@@ -52,13 +57,15 @@ 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,
@@ -73,6 +80,9 @@ 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];
@@ -123,7 +133,7 @@ static av_cold int init(AVFilterContext *ctx, const char *args)
     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;
 }
@@ -160,11 +170,13 @@ 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;
@@ -207,8 +219,17 @@ 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) {
@@ -236,6 +257,7 @@ static int config_output(AVFilterLink *link)
 
     link->w = crop->w;
     link->h = crop->h;
+    link->sample_aspect_ratio = crop->out_sar;
 
     return 0;
 }
@@ -315,12 +337,12 @@ static int draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
     return ff_draw_slice(ctx->outputs[0], y - crop->y, h, slice_dir);
 }
 
-static void end_frame(AVFilterLink *link)
+static int end_frame(AVFilterLink *link)
 {
     CropContext *crop = link->dst->priv;
 
     crop->var_values[VAR_N] += 1.0;
-    ff_end_frame(link->dst->outputs[0]);
+    return ff_end_frame(link->dst->outputs[0]);
 }
 
 AVFilter avfilter_vf_crop = {