FFmpeg: tools/graph2dot.c Source File

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graph2dot.c

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1 /*

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 */

21 #include "config.h"

22 #if HAVE_UNISTD_H

23 #include <unistd.h> /* getopt */

24 #endif

25 #include <stdio.h>

26 #include <string.h>

28 #include "libavutil/channel_layout.h"

29 #include "libavutil/mem.h"

30 #include "libavutil/pixdesc.h"

31 #include "libavfilter/avfilter.h"

33 #if !HAVE_GETOPT

34 #include "compat/getopt.c"

35 #endif

37 static void usage(void)

38 {

39 printf("Convert a libavfilter graph to a dot file.\n");

40 printf("Usage: graph2dot [OPTIONS]\n");

41 printf("\n"

42 "Options:\n"

43 "-i INFILE set INFILE as input file, stdin if omitted\n"

44 "-o OUTFILE set OUTFILE as output file, stdout if omitted\n"

45 "-h print this help\n");

46 }

48 struct line {

49 char data[256];

50 struct line *next;

51 };

53 static void print_digraph(FILE *outfile, AVFilterGraph *graph)

54 {

55 int i, j;

57 fprintf(outfile, "digraph G {\n");

58 fprintf(outfile, "node [shape=box]\n");

59 fprintf(outfile, "rankdir=LR\n");

61 for (i = 0; i < graph->nb_filters; i++) {

62 char filter_ctx_label[128];

63 const AVFilterContext *filter_ctx = graph->filters[i];

65 snprintf(filter_ctx_label, sizeof(filter_ctx_label), "%s\\n(%s)",

66 filter_ctx->name,

67 filter_ctx->filter->name);

69 for (j = 0; j < filter_ctx->nb_outputs; j++) {

70 AVFilterLink *link = filter_ctx->outputs[j];

71 if (link) {

72 char dst_filter_ctx_label[128];

73 const AVFilterContext *dst_filter_ctx = link->dst;

75 snprintf(dst_filter_ctx_label, sizeof(dst_filter_ctx_label),

76 "%s\\n(%s)",

77 dst_filter_ctx->name,

78 dst_filter_ctx->filter->name);

80 fprintf(outfile, "\"%s\" -> \"%s\" [ label= \"inpad:%s -> outpad:%s\\n",

81 filter_ctx_label, dst_filter_ctx_label,

82 link->srcpad->name, link->dstpad->name);

84 if (link->type == AVMEDIA_TYPE_VIDEO) {

85 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);

86 fprintf(outfile,

87 "fmt:%s w:%d h:%d tb:%d/%d",

88 desc->name,

89 link->w, link->h,

90 link->time_base.num, link->time_base.den);

91 } else if (link->type == AVMEDIA_TYPE_AUDIO) {

92 char buf[255];

93 av_get_channel_layout_string(buf, sizeof(buf), -1,

94 link->channel_layout);

95 fprintf(outfile,

96 "fmt:%s sr:%d cl:%s tb:%d/%d",

97 av_get_sample_fmt_name(link->format),

98 link->sample_rate, buf,

99 link->time_base.num, link->time_base.den);

100 }

101 fprintf(outfile, "\" ];\n");

102 }

103 }

104 }

105 fprintf(outfile, "}\n");

106 }

107

108 int main(int argc, char **argv)

109 {

110 const char *outfilename = NULL;

111 const char *infilename = NULL;

112 FILE *outfile = NULL;

113 FILE *infile = NULL;

114 char *graph_string = NULL;

115 AVFilterGraph *graph = av_mallocz(sizeof(AVFilterGraph));

116 char c;

117

118 av_log_set_level(AV_LOG_DEBUG);

119

120 while ((c = getopt(argc, argv, "hi:o:")) != -1) {

121 switch (c) {

122 case 'h':

123 usage();

124 return 0;

125 case 'i':

126 infilename = optarg;

127 break;

128 case 'o':

129 outfilename = optarg;

130 break;

131 case '?':

132 return 1;

133 }

134 }

135

136 if (!infilename || !strcmp(infilename, "-"))

137 infilename = "/dev/stdin";

138 infile = fopen(infilename, "r");

139 if (!infile) {

140 fprintf(stderr, "Failed to open input file '%s': %s\n",

141 infilename, strerror(errno));

142 return 1;

143 }

144

145 if (!outfilename || !strcmp(outfilename, "-"))

146 outfilename = "/dev/stdout";

147 outfile = fopen(outfilename, "w");

148 if (!outfile) {

149 fprintf(stderr, "Failed to open output file '%s': %s\n",

150 outfilename, strerror(errno));

151 return 1;

152 }

153

154 /* read from infile and put it in a buffer */

155 {

156 unsigned int count = 0;

157 struct line *line, *last_line, *first_line;

158 char *p;

159 last_line = first_line = av_malloc(sizeof(struct line));

160

161 while (fgets(last_line->data, sizeof(last_line->data), infile)) {

162 struct line *new_line = av_malloc(sizeof(struct line));

163 count += strlen(last_line->data);

164 last_line->next = new_line;

165 last_line = new_line;

166 }

167 last_line->next = NULL;

168

169 graph_string = av_malloc(count + 1);

170 p = graph_string;

171 for (line = first_line; line->next; line = line->next) {

172 unsigned int l = strlen(line->data);

173 memcpy(p, line->data, l);

174 p += l;

175 }

176 *p = '0円';

177 }

178

179 avfilter_register_all();

180

181 if (avfilter_graph_parse(graph, graph_string, NULL, NULL, NULL) < 0) {

182 fprintf(stderr, "Failed to parse the graph description\n");

183 return 1;

184 }

185

186 if (avfilter_graph_config(graph, NULL) < 0)

187 return 1;

188

189 print_digraph(outfile, graph);

190 fflush(outfile);

191

192 return 0;

193 }

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