[FFmpeg-cvslog] r22063 - in trunk: doc/libavfilter.texi libavfilter/Makefile tools/graph2dot.c
stefano
subversion
Thu Feb 25 20:55:01 CET 2010
Author: stefano
Date: Thu Feb 25 20:55:01 2010
New Revision: 22063
Log:
Add the graph2dot tools and document it.
Also link avfiltergraph.o and graphparser.o against libavfilter, as it
uses them.
Added:
trunk/tools/graph2dot.c
Modified:
trunk/doc/libavfilter.texi
trunk/libavfilter/Makefile
Modified: trunk/doc/libavfilter.texi
==============================================================================
--- trunk/doc/libavfilter.texi Thu Feb 25 20:38:54 2010 (r22062)
+++ trunk/doc/libavfilter.texi Thu Feb 25 20:55:01 2010 (r22063)
@@ -71,6 +71,34 @@ There exist so-called @var{source filter
input, and we expect in the future some @var{sink filters} that will
not have video output.
+ at chapter graph2dot
+
+The @file{graph2dot} program included in the FFmpeg @file{tools}
+directory can be used to parse a filter graph description and issue a
+corresponding textual representation in the dot language.
+
+Invoke the command:
+ at example
+graph2dot -h
+ at end example
+
+to see how to use @file{graph2dot}.
+
+You can then pass the dot description to the @file{dot} program (from
+the graphviz suite of programs) and obtain a graphical representation
+of the filter graph.
+
+For example the sequence of commands:
+ at example
+echo @var{GRAPH_DESCRIPTION} | \
+tools/graph2dot -o graph.tmp && \
+dot -Tpng graph.tmp -o graph.png && \
+display graph.png
+ at end example
+
+can be used to create and display an image representing the graph
+described by the @var{GRAPH_DESCRIPTION} string.
+
@chapter Available video filters
When you configure your FFmpeg build, you can disable any of the
Modified: trunk/libavfilter/Makefile
==============================================================================
--- trunk/libavfilter/Makefile Thu Feb 25 20:38:54 2010 (r22062)
+++ trunk/libavfilter/Makefile Thu Feb 25 20:55:01 2010 (r22063)
@@ -8,8 +8,10 @@ HEADERS = avfilter.h
OBJS = allfilters.o \
avfilter.o \
+ avfiltergraph.o \
defaults.o \
formats.o \
+ graphparser.o \
parseutils.o \
OBJS-$(CONFIG_CROP_FILTER) += vf_crop.o
Added: trunk/tools/graph2dot.c
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ trunk/tools/graph2dot.c Thu Feb 25 20:55:01 2010 (r22063)
@@ -0,0 +1,163 @@
+/*
+ * Copyright (c) 2008-2010 Stefano Sabatini
+ *
+ * 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 <unistd.h> /* getopt */
+
+#undef HAVE_AV_CONFIG_H
+#include "libavutil/pixdesc.h"
+#include "libavfilter/graphparser.h"
+
+static void usage(void)
+{
+ printf("Convert a libavfilter graph to a dot file\n");
+ printf("Usage: graph2dot [OPTIONS]\n");
+ printf("\n"
+ "Options:\n"
+ "-i INFILE set INFILE as input file, stdin if omitted\n"
+ "-o OUTFILE set OUTFILE as output file, stdout if omitted\n"
+ "-h print this help\n");
+}
+
+struct line {
+ char data[256];
+ struct line *next;
+};
+
+static void print_digraph(FILE *outfile, AVFilterGraph *graph)
+{
+ int i, j;
+
+ fprintf(outfile, "digraph G {\n");
+ fprintf(outfile, "node [shape=box]\n");
+ fprintf(outfile, "rankdir=LR\n");
+
+ for (i = 0; i < graph->filter_count; i++) {
+ char filter_ctx_label[128];
+ const AVFilterContext *filter_ctx = graph->filters[i];
+
+ snprintf(filter_ctx_label, sizeof(filter_ctx_label), "%s (%s)",
+ filter_ctx->name,
+ filter_ctx->filter->name);
+
+ for (j = 0; j < filter_ctx->output_count; j++) {
+ AVFilterLink *link = filter_ctx->outputs[j];
+ if (link) {
+ char dst_filter_ctx_label[128];
+ const AVFilterContext *dst_filter_ctx = link->dst;
+
+ snprintf(dst_filter_ctx_label, sizeof(dst_filter_ctx_label), "%s (%s)",
+ dst_filter_ctx->name,
+ dst_filter_ctx->filter->name);
+
+ fprintf(outfile, "\"%s\" -> \"%s\"", filter_ctx_label, dst_filter_ctx_label);
+ fprintf(outfile, " [ label= \"fmt:%s w:%d h:%d\"];\n",
+ av_pix_fmt_descriptors[link->format].name, link->w, link->h);
+ }
+ }
+ }
+ fprintf(outfile, "}\n");
+}
+
+int main(int argc, char **argv)
+{
+ const char *outfilename = NULL;
+ const char *infilename = NULL;
+ FILE *outfile = NULL;
+ FILE *infile = NULL;
+ char *graph_string = NULL;
+ AVFilterGraph *graph = av_mallocz(sizeof(AVFilterGraph));
+ char c;
+
+ av_log_set_level(AV_LOG_DEBUG);
+
+ while ((c = getopt(argc, argv, "hi:o:")) != -1) {
+ switch(c) {
+ case 'h':
+ usage();
+ return 0;
+ case 'i':
+ infilename = optarg;
+ break;
+ case 'o':
+ outfilename = optarg;
+ break;
+ case '?':
+ return 1;
+ }
+ }
+
+ if (!infilename || !strcmp(infilename, "-"))
+ infilename = "/dev/stdin";
+ infile = fopen(infilename, "r");
+ if (!infile) {
+ fprintf(stderr, "Impossible to open input file '%s': %s\n", infilename, strerror(errno));
+ return 1;
+ }
+
+ if (!outfilename || !strcmp(outfilename, "-"))
+ outfilename = "/dev/stdout";
+ outfile = fopen(outfilename, "w");
+ if (!outfile) {
+ fprintf(stderr, "Impossible to open output file '%s': %s\n", outfilename, strerror(errno));
+ return 1;
+ }
+
+ /* read from infile and put it in a buffer */
+ {
+ unsigned int count = 0;
+ struct line *line, *last_line, *first_line;
+ char *p;
+ last_line = first_line = av_malloc(sizeof(struct line));
+
+ while (fgets(last_line->data, sizeof(last_line->data), infile)) {
+ struct line *new_line = av_malloc(sizeof(struct line));
+ count += strlen(last_line->data);
+ last_line->next = new_line;
+ last_line = new_line;
+ }
+ last_line->next = NULL;
+
+ graph_string = av_malloc(count + 1);
+ p = graph_string;
+ for (line = first_line; line->next; line = line->next) {
+ unsigned int l = strlen(line->data);
+ memcpy(p, line->data, l);
+ p += l;
+ }
+ *p = '\0';
+ }
+
+ avfilter_register_all();
+
+ if (avfilter_graph_parse(graph, graph_string, NULL, NULL, NULL) < 0) {
+ fprintf(stderr, "Impossible to parse the graph description\n");
+ return 1;
+ }
+
+ if (avfilter_graph_check_validity(graph, NULL) ||
+ avfilter_graph_config_formats(graph, NULL) ||
+ avfilter_graph_config_links (graph, NULL))
+ return 1;
+
+ print_digraph(outfile, graph);
+ fflush(outfile);
+
+ return 0;
+}
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