FFmpeg: libavfilter/graphdump.c Source File

FFmpeg
graphdump.c
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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->input_count; 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->output_count; 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->input_count, filter->output_count);
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->input_count ) / 2;
98  unsigned out_no = j - (height - filter->output_count) / 2;
99 
100  /* Input link */
101  if (in_no < filter->input_count) {
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->output_count) {
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 }
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