LCOV - code coverage report
Current view: top level - libavfilter - vf_aspect.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 49 58 84.5 %
Date: 2017-12-15 11:05:35 Functions: 5 5 100.0 %

          Line data    Source code
       1             : /*
       2             :  * Copyright (c) 2010 Bobby Bingham
       3             :  *
       4             :  * This file is part of FFmpeg.
       5             :  *
       6             :  * FFmpeg is free software; you can redistribute it and/or
       7             :  * modify it under the terms of the GNU Lesser General Public
       8             :  * License as published by the Free Software Foundation; either
       9             :  * version 2.1 of the License, or (at your option) any later version.
      10             :  *
      11             :  * FFmpeg is distributed in the hope that it will be useful,
      12             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      13             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14             :  * Lesser General Public License for more details.
      15             :  *
      16             :  * You should have received a copy of the GNU Lesser General Public
      17             :  * License along with FFmpeg; if not, write to the Free Software
      18             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      19             :  */
      20             : 
      21             : /**
      22             :  * @file
      23             :  * aspect ratio modification video filters
      24             :  */
      25             : 
      26             : #include <float.h>
      27             : 
      28             : #include "libavutil/common.h"
      29             : #include "libavutil/eval.h"
      30             : #include "libavutil/mathematics.h"
      31             : #include "libavutil/opt.h"
      32             : #include "libavutil/parseutils.h"
      33             : #include "libavutil/pixdesc.h"
      34             : 
      35             : #include "avfilter.h"
      36             : #include "internal.h"
      37             : #include "video.h"
      38             : 
      39             : static const char *const var_names[] = {
      40             :     "w",
      41             :     "h",
      42             :     "a", "dar",
      43             :     "sar",
      44             :     "hsub",
      45             :     "vsub",
      46             :     NULL
      47             : };
      48             : 
      49             : enum var_name {
      50             :     VAR_W,
      51             :     VAR_H,
      52             :     VAR_A, VAR_DAR,
      53             :     VAR_SAR,
      54             :     VAR_HSUB,
      55             :     VAR_VSUB,
      56             :     VARS_NB
      57             : };
      58             : 
      59             : typedef struct AspectContext {
      60             :     const AVClass *class;
      61             :     AVRational dar;
      62             :     AVRational sar;
      63             :     int max;
      64             :     char *ratio_expr;
      65             : } AspectContext;
      66             : 
      67          63 : static int filter_frame(AVFilterLink *link, AVFrame *frame)
      68             : {
      69          63 :     AspectContext *s = link->dst->priv;
      70             : 
      71          63 :     frame->sample_aspect_ratio = s->sar;
      72          63 :     return ff_filter_frame(link->dst->outputs[0], frame);
      73             : }
      74             : 
      75             : #define OFFSET(x) offsetof(AspectContext, x)
      76             : #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
      77             : 
      78           7 : static inline void compute_dar(AVRational *dar, AVRational sar, int w, int h)
      79             : {
      80           7 :     if (sar.num && sar.den) {
      81           3 :         av_reduce(&dar->num, &dar->den, sar.num * w, sar.den * h, INT_MAX);
      82             :     } else {
      83           4 :         av_reduce(&dar->num, &dar->den, w, h, INT_MAX);
      84             :     }
      85           7 : }
      86             : 
      87           5 : static int get_aspect_ratio(AVFilterLink *inlink, AVRational *aspect_ratio)
      88             : {
      89           5 :     AVFilterContext *ctx = inlink->dst;
      90           5 :     AspectContext *s = inlink->dst->priv;
      91           5 :     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
      92             :     double var_values[VARS_NB], res;
      93             :     int ret;
      94             : 
      95           5 :     var_values[VAR_W]     = inlink->w;
      96           5 :     var_values[VAR_H]     = inlink->h;
      97           5 :     var_values[VAR_A]     = (double) inlink->w / inlink->h;
      98          10 :     var_values[VAR_SAR]   = inlink->sample_aspect_ratio.num ?
      99           5 :         (double) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1;
     100           5 :     var_values[VAR_DAR]   = var_values[VAR_A] * var_values[VAR_SAR];
     101           5 :     var_values[VAR_HSUB]  = 1 << desc->log2_chroma_w;
     102           5 :     var_values[VAR_VSUB]  = 1 << desc->log2_chroma_h;
     103             : 
     104             :     /* evaluate new aspect ratio*/
     105           5 :     ret = av_expr_parse_and_eval(&res, s->ratio_expr,
     106             :                                       var_names, var_values,
     107             :                                       NULL, NULL, NULL, NULL, NULL, 0, ctx);
     108           5 :     if (ret < 0) {
     109           0 :         ret = av_parse_ratio(aspect_ratio, s->ratio_expr, s->max, 0, ctx);
     110             :     } else
     111           5 :         *aspect_ratio = av_d2q(res, s->max);
     112             : 
     113           5 :     if (ret < 0) {
     114           0 :         av_log(ctx, AV_LOG_ERROR,
     115             :                "Error when evaluating the expression '%s'\n", s->ratio_expr);
     116           0 :         return ret;
     117             :     }
     118           5 :     if (aspect_ratio->num < 0 || aspect_ratio->den <= 0) {
     119           0 :         av_log(ctx, AV_LOG_ERROR,
     120             :                 "Invalid string '%s' for aspect ratio\n", s->ratio_expr);
     121           0 :         return AVERROR(EINVAL);
     122             :     }
     123           5 :     return 0;
     124             : }
     125             : 
     126             : #if CONFIG_SETDAR_FILTER
     127             : 
     128           3 : static int setdar_config_props(AVFilterLink *inlink)
     129             : {
     130           3 :     AspectContext *s = inlink->dst->priv;
     131             :     AVRational dar;
     132             :     AVRational old_dar;
     133           3 :     AVRational old_sar = inlink->sample_aspect_ratio;
     134             :     int ret;
     135             : 
     136           3 :     if ((ret = get_aspect_ratio(inlink, &s->dar)))
     137           0 :         return ret;
     138             : 
     139           3 :     if (s->dar.num && s->dar.den) {
     140           6 :         av_reduce(&s->sar.num, &s->sar.den,
     141           3 :                    s->dar.num * inlink->h,
     142           3 :                    s->dar.den * inlink->w, INT_MAX);
     143           3 :         inlink->sample_aspect_ratio = s->sar;
     144           3 :         dar = s->dar;
     145             :     } else {
     146           0 :         inlink->sample_aspect_ratio = (AVRational){ 1, 1 };
     147           0 :         dar = (AVRational){ inlink->w, inlink->h };
     148             :     }
     149             : 
     150           3 :     compute_dar(&old_dar, old_sar, inlink->w, inlink->h);
     151           3 :     av_log(inlink->dst, AV_LOG_VERBOSE, "w:%d h:%d dar:%d/%d sar:%d/%d -> dar:%d/%d sar:%d/%d\n",
     152             :            inlink->w, inlink->h, old_dar.num, old_dar.den, old_sar.num, old_sar.den,
     153             :            dar.num, dar.den, inlink->sample_aspect_ratio.num, inlink->sample_aspect_ratio.den);
     154             : 
     155           3 :     return 0;
     156             : }
     157             : 
     158             : static const AVOption setdar_options[] = {
     159             :     { "dar",   "set display aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
     160             :     { "ratio", "set display aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
     161             :     { "r",     "set display aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
     162             :     { "max",   "set max value for nominator or denominator in the ratio", OFFSET(max), AV_OPT_TYPE_INT, {.i64=100}, 1, INT_MAX, FLAGS },
     163             :     { NULL }
     164             : };
     165             : 
     166             : AVFILTER_DEFINE_CLASS(setdar);
     167             : 
     168             : static const AVFilterPad avfilter_vf_setdar_inputs[] = {
     169             :     {
     170             :         .name         = "default",
     171             :         .type         = AVMEDIA_TYPE_VIDEO,
     172             :         .config_props = setdar_config_props,
     173             :         .filter_frame = filter_frame,
     174             :     },
     175             :     { NULL }
     176             : };
     177             : 
     178             : static const AVFilterPad avfilter_vf_setdar_outputs[] = {
     179             :     {
     180             :         .name = "default",
     181             :         .type = AVMEDIA_TYPE_VIDEO,
     182             :     },
     183             :     { NULL }
     184             : };
     185             : 
     186             : AVFilter ff_vf_setdar = {
     187             :     .name        = "setdar",
     188             :     .description = NULL_IF_CONFIG_SMALL("Set the frame display aspect ratio."),
     189             :     .priv_size   = sizeof(AspectContext),
     190             :     .priv_class  = &setdar_class,
     191             :     .inputs      = avfilter_vf_setdar_inputs,
     192             :     .outputs     = avfilter_vf_setdar_outputs,
     193             : };
     194             : 
     195             : #endif /* CONFIG_SETDAR_FILTER */
     196             : 
     197             : #if CONFIG_SETSAR_FILTER
     198             : 
     199           2 : static int setsar_config_props(AVFilterLink *inlink)
     200             : {
     201           2 :     AspectContext *s = inlink->dst->priv;
     202           2 :     AVRational old_sar = inlink->sample_aspect_ratio;
     203             :     AVRational old_dar, dar;
     204             :     int ret;
     205             : 
     206           2 :     if ((ret = get_aspect_ratio(inlink, &s->sar)))
     207           0 :         return ret;
     208             : 
     209           2 :     inlink->sample_aspect_ratio = s->sar;
     210             : 
     211           2 :     compute_dar(&old_dar, old_sar, inlink->w, inlink->h);
     212           2 :     compute_dar(&dar, s->sar, inlink->w, inlink->h);
     213           2 :     av_log(inlink->dst, AV_LOG_VERBOSE, "w:%d h:%d sar:%d/%d dar:%d/%d -> sar:%d/%d dar:%d/%d\n",
     214             :            inlink->w, inlink->h, old_sar.num, old_sar.den, old_dar.num, old_dar.den,
     215             :            inlink->sample_aspect_ratio.num, inlink->sample_aspect_ratio.den, dar.num, dar.den);
     216             : 
     217           2 :     return 0;
     218             : }
     219             : 
     220             : static const AVOption setsar_options[] = {
     221             :     { "sar",   "set sample (pixel) aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
     222             :     { "ratio", "set sample (pixel) aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
     223             :     { "r",     "set sample (pixel) aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
     224             :     { "max",   "set max value for nominator or denominator in the ratio", OFFSET(max), AV_OPT_TYPE_INT, {.i64=100}, 1, INT_MAX, FLAGS },
     225             :     { NULL }
     226             : };
     227             : 
     228             : AVFILTER_DEFINE_CLASS(setsar);
     229             : 
     230             : static const AVFilterPad avfilter_vf_setsar_inputs[] = {
     231             :     {
     232             :         .name         = "default",
     233             :         .type         = AVMEDIA_TYPE_VIDEO,
     234             :         .config_props = setsar_config_props,
     235             :         .filter_frame = filter_frame,
     236             :     },
     237             :     { NULL }
     238             : };
     239             : 
     240             : static const AVFilterPad avfilter_vf_setsar_outputs[] = {
     241             :     {
     242             :         .name = "default",
     243             :         .type = AVMEDIA_TYPE_VIDEO,
     244             :     },
     245             :     { NULL }
     246             : };
     247             : 
     248             : AVFilter ff_vf_setsar = {
     249             :     .name        = "setsar",
     250             :     .description = NULL_IF_CONFIG_SMALL("Set the pixel sample aspect ratio."),
     251             :     .priv_size   = sizeof(AspectContext),
     252             :     .priv_class  = &setsar_class,
     253             :     .inputs      = avfilter_vf_setsar_inputs,
     254             :     .outputs     = avfilter_vf_setsar_outputs,
     255             : };
     256             : 
     257             : #endif /* CONFIG_SETSAR_FILTER */

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