[Sound-open-firmware] [PATCH] topology: utility for visualizing topology

[Ranjani Sridharan]

Add a simple utility that parses topology bin files and
creates a graph using the linux dot tool.

Signed-off-by: Ranjani Sridharan <ranjani.sridharan at linux.intel.com>
---
 topology/Makefile.am      |   5 ++
 topology/parse_topology.c | 130 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 135 insertions(+)
 create mode 100644 topology/parse_topology.c

diff --git a/topology/Makefile.am b/topology/Makefile.am
index 73e10e9..b69dfb4 100644
--- a/topology/Makefile.am
+++ b/topology/Makefile.am
@@ -59,3 +59,8 @@ EXTRA_DIST = \
 	sof-cnl-rt274.m4 \
 	sof-hsw-rt5640.m4 \
 	sof-apl-tdf8532.m4
+
+bin_PROGRAMS = tplg_graph
+
+tplg_graph_SOURCES = \
+	parse_topology.c
diff --git a/topology/parse_topology.c b/topology/parse_topology.c
new file mode 100644
index 0000000..b54ca77
--- /dev/null
+++ b/topology/parse_topology.c
@@ -0,0 +1,130 @@
+/*
+ * Utility for visualizing topology files.
+ *
+ * Copyright (c) 2015, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+
+#include <stdio.h>
+#include <sound/asoc.h>
+#include <string.h>
+#include <stdlib.h>
+
+/*
+ * The output graph is saved as "tplg.png"
+ * Usage: ./tplg_graph <tplg file>
+ */
+
+int main(int argc, char **argv)
+{
+	struct snd_soc_tplg_hdr *hdr;
+	struct snd_soc_tplg_dapm_graph_elem *graph_elem;
+	char *filename;
+	char *dotfilename = "tplg.dot";
+	FILE *file, *dotfile;
+	char *start = "digraph topology {\n";
+	char *node_color = "node [color=Red,fontname=Courier]\n";
+	char *edge_color = "edge [color=Blue, style=dashed]\n";
+	char *end = "}\n";
+	char edge[256];
+	int i, status, ret;
+	size_t size, file_size;
+
+	/* command line arguments */
+	if (argc < 2) {
+		printf("usage: tplg_graph <tplg file>\n");
+		exit(EXIT_FAILURE);
+	}
+
+	filename = malloc(strlen(argv[1]));
+	strcpy(filename, argv[1]);
+
+	/* open files */
+	file = fopen(filename, "rb");
+	if (!file) {
+		fprintf(stderr, "Unable to open file %s", filename);
+		return -1;
+	}
+
+	dotfile = fopen(dotfilename, "w");
+	if (!dotfile) {
+		fprintf(stderr, "Unable to open file %s", dotfilename);
+		return -1;
+	}
+
+	fwrite(start, strlen(start), 1, dotfile);
+	fwrite(node_color, strlen(node_color), 1, dotfile);
+	fwrite(edge_color, strlen(edge_color), 1, dotfile);
+
+
+	/* file size */
+	fseek(file, 0, SEEK_END);
+	file_size = ftell(file);
+	fseek(file, 0, SEEK_SET);
+
+	/* Allocate memory */
+	size = sizeof(struct snd_soc_tplg_hdr);
+	hdr = (struct snd_soc_tplg_hdr *)malloc(size);
+	if (!hdr) {
+		printf("error: mem alloc\n");
+		return -1;
+	}
+
+	size = sizeof(struct snd_soc_tplg_dapm_graph_elem);
+	graph_elem = (struct snd_soc_tplg_dapm_graph_elem *)malloc(size);
+	if (!graph_elem) {
+		printf("error: mem alloc\n");
+		return -1;
+	}
+
+	while (1) {
+		ret = fread(hdr, sizeof(struct snd_soc_tplg_hdr), 1, file);
+		if (ret != 1)
+			printf("error: reading header\n");
+
+		switch (hdr->type) {
+		case SND_SOC_TPLG_TYPE_DAPM_GRAPH:
+			size = sizeof(struct snd_soc_tplg_dapm_graph_elem);
+			/* parse pipeline graph */
+			for (i = 0; i < hdr->count; i++) {
+				ret = fread(graph_elem, size, 1, file);
+				if (ret != 1)
+					printf("error: reading graph elem\n");
+
+				/* write route to output dot file */
+				sprintf(edge, "\"%s\"->\"%s\"\n",
+					graph_elem->source, graph_elem->sink);
+				fwrite(edge, strlen(edge), 1, dotfile);
+				fwrite("\n", 1, 1, dotfile);
+			}
+
+			if (ftell(file) == file_size)
+				goto finish;
+			break;
+
+		default:
+			fseek(file, hdr->payload_size, SEEK_CUR);
+			if (ftell(file) == file_size)
+				goto finish;
+			break;
+		}
+	}
+
+finish:
+	fwrite(end, strlen(end), 1, dotfile);
+	fclose(dotfile);
+	fclose(file);
+	free(hdr);
+	free(graph_elem);
+
+	/* create topology graph */
+	status = system("dot tplg.dot -Tpng -o tplg.png");
+}
-- 
2.14.1