diff options
Diffstat (limited to 'libavfilter/vf_crop.c')
-rw-r--r-- | libavfilter/vf_crop.c | 51 |
1 files changed, 35 insertions, 16 deletions
diff --git a/libavfilter/vf_crop.c b/libavfilter/vf_crop.c index 1c8e877..4e794df 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 */ @@ -39,13 +39,15 @@ #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 @@ -55,13 +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, @@ -76,6 +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]; @@ -126,7 +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; } @@ -163,11 +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; @@ -210,8 +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) { @@ -239,6 +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; } |