mirror of https://github.com/FFmpeg/FFmpeg.git
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>pull/250/head
Aman Gupta
8 years ago
committed by
Mark Thompson
parent
c8467abbad
commit
037bb4021c
6 changed files with 216 additions and 193 deletions
@ -0,0 +1,152 @@ |
||||
/*
|
||||
* 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.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 |
||||
}; |
||||
|
||||
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 w, h; |
||||
int factor_w, factor_h; |
||||
int eval_w, eval_h; |
||||
int ret; |
||||
double var_values[VARS_NB], res; |
||||
|
||||
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; |
||||
|
||||
/* evaluate width and height */ |
||||
av_expr_parse_and_eval(&res, (expr = w_expr), |
||||
var_names, var_values, |
||||
NULL, NULL, NULL, NULL, NULL, 0, log_ctx); |
||||
eval_w = var_values[VAR_OUT_W] = var_values[VAR_OW] = res; |
||||
|
||||
if ((ret = av_expr_parse_and_eval(&res, (expr = h_expr), |
||||
var_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] = res; |
||||
/* evaluate again the width, as it may depend on the output height */ |
||||
if ((ret = av_expr_parse_and_eval(&res, (expr = w_expr), |
||||
var_names, var_values, |
||||
NULL, NULL, NULL, NULL, NULL, 0, log_ctx)) < 0) |
||||
goto fail; |
||||
eval_w = res; |
||||
|
||||
w = eval_w; |
||||
h = eval_h; |
||||
|
||||
/* Check if it is requested that the result has to be divisible by a 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) |
||||
eval_w = eval_h = 0; |
||||
|
||||
if (!(w = eval_w)) |
||||
w = inlink->w; |
||||
if (!(h = eval_h)) |
||||
h = inlink->h; |
||||
|
||||
/* Make sure that the result is divisible by the factor we determined
|
||||
* earlier. If no factor was set, it is 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; |
||||
|
||||
*ret_w = w; |
||||
*ret_h = 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; |
||||
} |
||||
@ -0,0 +1,28 @@ |
||||
/*
|
||||
* 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 |
||||
*/ |
||||
|
||||
#ifndef AVFILTER_SCALE_H |
||||
#define AVFILTER_SCALE_H |
||||
|
||||
#include "avfilter.h" |
||||
|
||||
int ff_scale_eval_dimensions(void *ctx, |
||||
const char *w_expr, const char *h_expr, |
||||
AVFilterLink *inlink, AVFilterLink *outlink, |
||||
int *ret_w, int *ret_h); |
||||
#endif |
||||
Loading…
Reference in new issue