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![Aman Gupta](/assets/img/avatar_default.png)
Implements support for height/width expressions in vf_scale_vaapi, by refactoring common code into a new libavfilter/scale.c Signed-off-by: Mark Thompson <sw@jkqxz.net>
153 lines
4.6 KiB
C
153 lines
4.6 KiB
C
/*
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* Copyright (c) 2007 Bobby Bingham
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdint.h>
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#include "scale.h"
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#include "libavutil/eval.h"
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#include "libavutil/mathematics.h"
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#include "libavutil/pixdesc.h"
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static const char *const var_names[] = {
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"PI",
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"PHI",
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"E",
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"in_w", "iw",
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"in_h", "ih",
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"out_w", "ow",
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"out_h", "oh",
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"a",
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"sar",
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"dar",
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"hsub",
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"vsub",
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"ohsub",
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"ovsub",
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NULL
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};
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enum var_name {
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VAR_PI,
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VAR_PHI,
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VAR_E,
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VAR_IN_W, VAR_IW,
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VAR_IN_H, VAR_IH,
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VAR_OUT_W, VAR_OW,
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VAR_OUT_H, VAR_OH,
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VAR_A,
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VAR_SAR,
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VAR_DAR,
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VAR_HSUB,
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VAR_VSUB,
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VAR_OHSUB,
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VAR_OVSUB,
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VARS_NB
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};
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int ff_scale_eval_dimensions(void *log_ctx,
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const char *w_expr, const char *h_expr,
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AVFilterLink *inlink, AVFilterLink *outlink,
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int *ret_w, int *ret_h)
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{
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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const AVPixFmtDescriptor *out_desc = av_pix_fmt_desc_get(outlink->format);
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const char *expr;
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int w, h;
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int factor_w, factor_h;
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int eval_w, eval_h;
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int ret;
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double var_values[VARS_NB], res;
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var_values[VAR_PI] = M_PI;
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var_values[VAR_PHI] = M_PHI;
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var_values[VAR_E] = M_E;
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var_values[VAR_IN_W] = var_values[VAR_IW] = inlink->w;
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var_values[VAR_IN_H] = var_values[VAR_IH] = inlink->h;
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var_values[VAR_OUT_W] = var_values[VAR_OW] = NAN;
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var_values[VAR_OUT_H] = var_values[VAR_OH] = NAN;
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var_values[VAR_A] = (double) inlink->w / inlink->h;
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var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ?
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(double) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1;
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var_values[VAR_DAR] = var_values[VAR_A] * var_values[VAR_SAR];
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var_values[VAR_HSUB] = 1 << desc->log2_chroma_w;
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var_values[VAR_VSUB] = 1 << desc->log2_chroma_h;
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var_values[VAR_OHSUB] = 1 << out_desc->log2_chroma_w;
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var_values[VAR_OVSUB] = 1 << out_desc->log2_chroma_h;
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/* evaluate width and height */
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av_expr_parse_and_eval(&res, (expr = w_expr),
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var_names, var_values,
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NULL, NULL, NULL, NULL, NULL, 0, log_ctx);
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eval_w = var_values[VAR_OUT_W] = var_values[VAR_OW] = res;
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if ((ret = av_expr_parse_and_eval(&res, (expr = h_expr),
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var_names, var_values,
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NULL, NULL, NULL, NULL, NULL, 0, log_ctx)) < 0)
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goto fail;
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eval_h = var_values[VAR_OUT_H] = var_values[VAR_OH] = res;
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/* evaluate again the width, as it may depend on the output height */
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if ((ret = av_expr_parse_and_eval(&res, (expr = w_expr),
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var_names, var_values,
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NULL, NULL, NULL, NULL, NULL, 0, log_ctx)) < 0)
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goto fail;
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eval_w = res;
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w = eval_w;
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h = eval_h;
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/* Check if it is requested that the result has to be divisible by a some
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* factor (w or h = -n with n being the factor). */
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factor_w = 1;
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factor_h = 1;
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if (w < -1) {
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factor_w = -w;
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}
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if (h < -1) {
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factor_h = -h;
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}
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if (w < 0 && h < 0)
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eval_w = eval_h = 0;
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if (!(w = eval_w))
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w = inlink->w;
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if (!(h = eval_h))
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h = inlink->h;
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/* Make sure that the result is divisible by the factor we determined
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* earlier. If no factor was set, it is nothing will happen as the default
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* factor is 1 */
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if (w < 0)
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w = av_rescale(h, inlink->w, inlink->h * factor_w) * factor_w;
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if (h < 0)
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h = av_rescale(w, inlink->h, inlink->w * factor_h) * factor_h;
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*ret_w = w;
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*ret_h = h;
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return 0;
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fail:
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av_log(log_ctx, AV_LOG_ERROR,
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"Error when evaluating the expression '%s'.\n"
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"Maybe the expression for out_w:'%s' or for out_h:'%s' is self-referencing.\n",
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expr, w_expr, h_expr);
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return ret;
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}
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