diff options
author | Gyan Doshi <ffmpeg@gyani.pro> | 2019-12-08 16:42:36 +0530 |
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committer | Gyan Doshi <ffmpeg@gyani.pro> | 2019-12-10 12:55:48 +0530 |
commit | e73688eff43727eb79eb344a4def49540d463902 (patch) | |
tree | 5348aedda4fdf885a08e60f1ff33b65b2316b6cc /libavfilter/scale_eval.c | |
parent | 9f7b2b37e3c6a1844cf1536bccf6123720fb30e6 (diff) |
avfilter: rename scale.c,h to scale_eval
scale.c is too generic; scale_eval is more representative
Diffstat (limited to 'libavfilter/scale_eval.c')
-rw-r--r-- | libavfilter/scale_eval.c | 250 |
1 files changed, 250 insertions, 0 deletions
diff --git a/libavfilter/scale_eval.c b/libavfilter/scale_eval.c new file mode 100644 index 0000000000..a3439a95e0 --- /dev/null +++ b/libavfilter/scale_eval.c @@ -0,0 +1,250 @@ +/* + * Copyright (c) 2007 Bobby Bingham + * + * This file is part of FFmpeg. + * + * 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. + * + * 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 FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <stdint.h> +#include "scale_eval.h" +#include "libavutil/eval.h" +#include "libavutil/mathematics.h" +#include "libavutil/pixdesc.h" + +static const char *const var_names[] = { + "PI", + "PHI", + "E", + "in_w", "iw", + "in_h", "ih", + "out_w", "ow", + "out_h", "oh", + "a", + "sar", + "dar", + "hsub", + "vsub", + "ohsub", + "ovsub", + NULL +}; + +enum var_name { + VAR_PI, + VAR_PHI, + VAR_E, + 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_OHSUB, + VAR_OVSUB, + VARS_NB +}; + +/** + * This must be kept in sync with var_names so that it is always a + * complete list of var_names with the scale2ref specific names + * appended. scale2ref values must appear in the order they appear + * in the var_name_scale2ref enum but also be below all of the + * non-scale2ref specific values. + */ +static const char *const var_names_scale2ref[] = { + "PI", + "PHI", + "E", + "in_w", "iw", + "in_h", "ih", + "out_w", "ow", + "out_h", "oh", + "a", + "sar", + "dar", + "hsub", + "vsub", + "ohsub", + "ovsub", + "main_w", + "main_h", + "main_a", + "main_sar", + "main_dar", "mdar", + "main_hsub", + "main_vsub", + NULL +}; + +enum var_name_scale2ref { + VAR_S2R_MAIN_W, + VAR_S2R_MAIN_H, + VAR_S2R_MAIN_A, + VAR_S2R_MAIN_SAR, + VAR_S2R_MAIN_DAR, VAR_S2R_MDAR, + VAR_S2R_MAIN_HSUB, + VAR_S2R_MAIN_VSUB, + VARS_S2R_NB +}; + +int ff_scale_eval_dimensions(void *log_ctx, + const char *w_expr, const char *h_expr, + AVFilterLink *inlink, AVFilterLink *outlink, + int *ret_w, int *ret_h) +{ + const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); + const AVPixFmtDescriptor *out_desc = av_pix_fmt_desc_get(outlink->format); + const char *expr; + int eval_w, eval_h; + int ret; + const char scale2ref = outlink->src->nb_inputs == 2 && outlink->src->inputs[1] == inlink; + double var_values[VARS_NB + VARS_S2R_NB], res; + const AVPixFmtDescriptor *main_desc; + const AVFilterLink *main_link; + const char *const *names = scale2ref ? var_names_scale2ref : var_names; + + if (scale2ref) { + main_link = outlink->src->inputs[0]; + main_desc = av_pix_fmt_desc_get(main_link->format); + } + + var_values[VAR_PI] = M_PI; + var_values[VAR_PHI] = M_PHI; + var_values[VAR_E] = M_E; + var_values[VAR_IN_W] = var_values[VAR_IW] = inlink->w; + var_values[VAR_IN_H] = var_values[VAR_IH] = inlink->h; + var_values[VAR_OUT_W] = var_values[VAR_OW] = NAN; + var_values[VAR_OUT_H] = var_values[VAR_OH] = NAN; + var_values[VAR_A] = (double) inlink->w / inlink->h; + var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ? + (double) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1; + var_values[VAR_DAR] = var_values[VAR_A] * var_values[VAR_SAR]; + var_values[VAR_HSUB] = 1 << desc->log2_chroma_w; + var_values[VAR_VSUB] = 1 << desc->log2_chroma_h; + var_values[VAR_OHSUB] = 1 << out_desc->log2_chroma_w; + var_values[VAR_OVSUB] = 1 << out_desc->log2_chroma_h; + + if (scale2ref) { + var_values[VARS_NB + VAR_S2R_MAIN_W] = main_link->w; + var_values[VARS_NB + VAR_S2R_MAIN_H] = main_link->h; + var_values[VARS_NB + VAR_S2R_MAIN_A] = (double) main_link->w / main_link->h; + var_values[VARS_NB + VAR_S2R_MAIN_SAR] = main_link->sample_aspect_ratio.num ? + (double) main_link->sample_aspect_ratio.num / main_link->sample_aspect_ratio.den : 1; + var_values[VARS_NB + VAR_S2R_MAIN_DAR] = var_values[VARS_NB + VAR_S2R_MDAR] = + var_values[VARS_NB + VAR_S2R_MAIN_A] * var_values[VARS_NB + VAR_S2R_MAIN_SAR]; + var_values[VARS_NB + VAR_S2R_MAIN_HSUB] = 1 << main_desc->log2_chroma_w; + var_values[VARS_NB + VAR_S2R_MAIN_VSUB] = 1 << main_desc->log2_chroma_h; + } + + /* evaluate width and height */ + av_expr_parse_and_eval(&res, (expr = w_expr), + names, var_values, + NULL, NULL, NULL, NULL, NULL, 0, log_ctx); + eval_w = var_values[VAR_OUT_W] = var_values[VAR_OW] = (int) res == 0 ? inlink->w : (int) res; + + if ((ret = av_expr_parse_and_eval(&res, (expr = h_expr), + names, var_values, + NULL, NULL, NULL, NULL, NULL, 0, log_ctx)) < 0) + goto fail; + eval_h = var_values[VAR_OUT_H] = var_values[VAR_OH] = (int) res == 0 ? inlink->h : (int) res; + /* evaluate again the width, as it may depend on the output height */ + if ((ret = av_expr_parse_and_eval(&res, (expr = w_expr), + names, var_values, + NULL, NULL, NULL, NULL, NULL, 0, log_ctx)) < 0) + goto fail; + eval_w = (int) res == 0 ? inlink->w : (int) res; + + *ret_w = eval_w; + *ret_h = eval_h; + + return 0; + +fail: + av_log(log_ctx, AV_LOG_ERROR, + "Error when evaluating the expression '%s'.\n" + "Maybe the expression for out_w:'%s' or for out_h:'%s' is self-referencing.\n", + expr, w_expr, h_expr); + return ret; +} + +int ff_scale_adjust_dimensions(AVFilterLink *inlink, + int *ret_w, int *ret_h, + int force_original_aspect_ratio, int force_divisible_by) +{ + int w, h; + int factor_w, factor_h; + + w = *ret_w; + h = *ret_h; + + /* Check if it is requested that the result has to be divisible by some + * factor (w or h = -n with n being the factor). */ + factor_w = 1; + factor_h = 1; + if (w < -1) { + factor_w = -w; + } + if (h < -1) { + factor_h = -h; + } + + if (w < 0 && h < 0) { + w = inlink->w; + h = inlink->h; + } + + /* Make sure that the result is divisible by the factor we determined + * earlier. If no factor was set, nothing will happen as the default + * factor is 1 */ + if (w < 0) + w = av_rescale(h, inlink->w, inlink->h * factor_w) * factor_w; + if (h < 0) + h = av_rescale(w, inlink->h, inlink->w * factor_h) * factor_h; + + /* Note that force_original_aspect_ratio may overwrite the previous set + * dimensions so that it is not divisible by the set factors anymore + * unless force_divisible_by is defined as well */ + if (force_original_aspect_ratio) { + int tmp_w = av_rescale(h, inlink->w, inlink->h); + int tmp_h = av_rescale(w, inlink->h, inlink->w); + + if (force_original_aspect_ratio == 1) { + w = FFMIN(tmp_w, w); + h = FFMIN(tmp_h, h); + if (force_divisible_by > 1) { + // round down + w = w / force_divisible_by * force_divisible_by; + h = h / force_divisible_by * force_divisible_by; + } + } else { + w = FFMAX(tmp_w, w); + h = FFMAX(tmp_h, h); + if (force_divisible_by > 1) { + // round up + w = (w + force_divisible_by - 1) / force_divisible_by * force_divisible_by; + h = (h + force_divisible_by - 1) / force_divisible_by * force_divisible_by; + } + } + } + + *ret_w = w; + *ret_h = h; + + return 0; +} |