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  1. /*
  2.  * Filter graphs to bad ASCII-art
  3.  * Copyright (c) 2012 Nicolas George
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. #include <string.h>
  23.  
  24. #include "libavutil/channel_layout.h"
  25. #include "libavutil/bprint.h"
  26. #include "libavutil/pixdesc.h"
  27. #include "avfilter.h"
  28. #include "avfiltergraph.h"
  29.  
  30. static int print_link_prop(AVBPrint *buf, AVFilterLink *link)
  31. {
  32.     char *format;
  33.     char layout[64];
  34.  
  35.     if (!buf)
  36.         buf = &(AVBPrint){ 0 }; /* dummy buffer */
  37.     switch (link->type) {
  38.         case AVMEDIA_TYPE_VIDEO:
  39.             format = av_x_if_null(av_get_pix_fmt_name(link->format), "?");
  40.             av_bprintf(buf, "[%dx%d %d:%d %s]", link->w, link->h,
  41.                     link->sample_aspect_ratio.num,
  42.                     link->sample_aspect_ratio.den,
  43.                     format);
  44.             break;
  45.  
  46.         case AVMEDIA_TYPE_AUDIO:
  47.             av_get_channel_layout_string(layout, sizeof(layout),
  48.                                          link->channels, link->channel_layout);
  49.             format = av_x_if_null(av_get_sample_fmt_name(link->format), "?");
  50.             av_bprintf(buf, "[%dHz %s:%s]",
  51.                        (int)link->sample_rate, format, layout);
  52.             break;
  53.  
  54.         default:
  55.             av_bprintf(buf, "?");
  56.             break;
  57.     }
  58.     return buf->len;
  59. }
  60.  
  61. static void avfilter_graph_dump_to_buf(AVBPrint *buf, AVFilterGraph *graph)
  62. {
  63.     unsigned i, j, x, e;
  64.  
  65.     for (i = 0; i < graph->nb_filters; i++) {
  66.         AVFilterContext *filter = graph->filters[i];
  67.         unsigned max_src_name = 0, max_dst_name = 0;
  68.         unsigned max_in_name  = 0, max_out_name = 0;
  69.         unsigned max_in_fmt   = 0, max_out_fmt  = 0;
  70.         unsigned width, height, in_indent;
  71.         unsigned lname = strlen(filter->name);
  72.         unsigned ltype = strlen(filter->filter->name);
  73.  
  74.         for (j = 0; j < filter->nb_inputs; j++) {
  75.             AVFilterLink *l = filter->inputs[j];
  76.             unsigned ln = strlen(l->src->name) + 1 + strlen(l->srcpad->name);
  77.             max_src_name = FFMAX(max_src_name, ln);
  78.             max_in_name = FFMAX(max_in_name, strlen(l->dstpad->name));
  79.             max_in_fmt = FFMAX(max_in_fmt, print_link_prop(NULL, l));
  80.         }
  81.         for (j = 0; j < filter->nb_outputs; j++) {
  82.             AVFilterLink *l = filter->outputs[j];
  83.             unsigned ln = strlen(l->dst->name) + 1 + strlen(l->dstpad->name);
  84.             max_dst_name = FFMAX(max_dst_name, ln);
  85.             max_out_name = FFMAX(max_out_name, strlen(l->srcpad->name));
  86.             max_out_fmt = FFMAX(max_out_fmt, print_link_prop(NULL, l));
  87.         }
  88.         in_indent = max_src_name + max_in_name + max_in_fmt;
  89.         in_indent += in_indent ? 4 : 0;
  90.         width = FFMAX(lname + 2, ltype + 4);
  91.         height = FFMAX3(2, filter->nb_inputs, filter->nb_outputs);
  92.         av_bprint_chars(buf, ' ', in_indent);
  93.         av_bprintf(buf, "+");
  94.         av_bprint_chars(buf, '-', width);
  95.         av_bprintf(buf, "+\n");
  96.         for (j = 0; j < height; j++) {
  97.             unsigned in_no  = j - (height - filter->nb_inputs ) / 2;
  98.             unsigned out_no = j - (height - filter->nb_outputs) / 2;
  99.  
  100.             /* Input link */
  101.             if (in_no < filter->nb_inputs) {
  102.                 AVFilterLink *l = filter->inputs[in_no];
  103.                 e = buf->len + max_src_name + 2;
  104.                 av_bprintf(buf, "%s:%s", l->src->name, l->srcpad->name);
  105.                 av_bprint_chars(buf, '-', e - buf->len);
  106.                 e = buf->len + max_in_fmt + 2 +
  107.                     max_in_name - strlen(l->dstpad->name);
  108.                 print_link_prop(buf, l);
  109.                 av_bprint_chars(buf, '-', e - buf->len);
  110.                 av_bprintf(buf, "%s", l->dstpad->name);
  111.             } else {
  112.                 av_bprint_chars(buf, ' ', in_indent);
  113.             }
  114.  
  115.             /* Filter */
  116.             av_bprintf(buf, "|");
  117.             if (j == (height - 2) / 2) {
  118.                 x = (width - lname) / 2;
  119.                 av_bprintf(buf, "%*s%-*s", x, "", width - x, filter->name);
  120.             } else if (j == (height - 2) / 2 + 1) {
  121.                 x = (width - ltype - 2) / 2;
  122.                 av_bprintf(buf, "%*s(%s)%*s", x, "", filter->filter->name,
  123.                         width - ltype - 2 - x, "");
  124.             } else {
  125.                 av_bprint_chars(buf, ' ', width);
  126.             }
  127.             av_bprintf(buf, "|");
  128.  
  129.             /* Output link */
  130.             if (out_no < filter->nb_outputs) {
  131.                 AVFilterLink *l = filter->outputs[out_no];
  132.                 unsigned ln = strlen(l->dst->name) + 1 +
  133.                               strlen(l->dstpad->name);
  134.                 e = buf->len + max_out_name + 2;
  135.                 av_bprintf(buf, "%s", l->srcpad->name);
  136.                 av_bprint_chars(buf, '-', e - buf->len);
  137.                 e = buf->len + max_out_fmt + 2 +
  138.                     max_dst_name - ln;
  139.                 print_link_prop(buf, l);
  140.                 av_bprint_chars(buf, '-', e - buf->len);
  141.                 av_bprintf(buf, "%s:%s", l->dst->name, l->dstpad->name);
  142.             }
  143.             av_bprintf(buf, "\n");
  144.         }
  145.         av_bprint_chars(buf, ' ', in_indent);
  146.         av_bprintf(buf, "+");
  147.         av_bprint_chars(buf, '-', width);
  148.         av_bprintf(buf, "+\n");
  149.         av_bprintf(buf, "\n");
  150.     }
  151. }
  152.  
  153. char *avfilter_graph_dump(AVFilterGraph *graph, const char *options)
  154. {
  155.     AVBPrint buf;
  156.     char *dump;
  157.  
  158.     av_bprint_init(&buf, 0, 0);
  159.     avfilter_graph_dump_to_buf(&buf, graph);
  160.     av_bprint_init(&buf, buf.len + 1, buf.len + 1);
  161.     avfilter_graph_dump_to_buf(&buf, graph);
  162.     av_bprint_finalize(&buf, &dump);
  163.     return dump;
  164. }
  165.