From 33a09bfcae7410a02eee922118353b94c089cc29 Mon Sep 17 00:00:00 2001
From: Mauro Carvalho Chehab <mchehab@redhat.com>
Date: Sat, 28 May 2011 16:49:57 -0300
Subject: [PATCH] v4l2-sysfs-path: Show devices ordered by the video node
 number

Instead of calling the default print function, it implements its
own logic that will print all devices video ordered, plus the
audio playback devices. The output will be something like:

Video device: video0
	vbi: vbi0
	dvb frontend: dvb0.frontend0
	dvb demux: dvb0.demux0
	dvb dvr: dvb0.dvr0
	dvb net: dvb0.net0
	sound card: hw:2
	pcm capture: hw:2,0
	mixer: hw:2
Video device: video1
	sound card: hw:1
	pcm capture: hw:1,0
	mixer: hw:1
Alsa playback device(s): hw:0,0 hw:0,1

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
---
 utils/v4l2-sysfs-path/v4l2-sysfs-path.c | 65 +++++++++++++++++++++++++++++----
 1 file changed, 57 insertions(+), 8 deletions(-)

diff --git a/utils/v4l2-sysfs-path/v4l2-sysfs-path.c b/utils/v4l2-sysfs-path/v4l2-sysfs-path.c
index 3ba446d..8ad0bda 100644
--- a/utils/v4l2-sysfs-path/v4l2-sysfs-path.c
+++ b/utils/v4l2-sysfs-path/v4l2-sysfs-path.c
@@ -27,21 +27,70 @@
 #include "../libmedia_dev/get_media_devices.h"
 #include <stdio.h>
 
+static void print_all_associated_devices(void *md, char *vid,
+					 enum device_type type)
+{
+	char *devname = NULL;
+	int first = 1;
+
+	do {
+		devname = get_associated_device(md, devname, type,
+						vid, V4L_VIDEO);
+		if (devname) {
+			if (first) {
+				printf("\t%s: ", media_device_type(type));
+				first = 0;
+			}
+
+			printf("%s ", devname);
+		}
+	} while (devname);
+	if (!first)
+		printf("\n");
+}
+
+static void print_all_alsa_independent_playback(void *md)
+{
+	char *devname = NULL;
+	int first = 1;
+
+	do {
+		devname = get_not_associated_device(md, devname,
+						    SND_OUT, V4L_VIDEO);
+		if (devname) {
+			if (first) {
+				printf("Alsa playback device(s): ");
+				first = 0;
+			}
+
+			printf("%s ", devname);
+		}
+	} while (devname);
+	if (!first)
+		printf("\n");
+}
+
 int main(void)
 {
 	void *md;
-	char *alsa;
+	char *vid, *alsa;
+	int i;
 
 	md = discover_media_devices();
-	display_media_devices(md);
 
-	alsa = get_associated_device(md, NULL, SND_CAP, "video0", V4L_VIDEO);
-	if (alsa)
-		printf("Alsa device associated with video0 capture: %s\n", alsa);
+	vid = NULL;
+	do {
+		vid = get_associated_device(md, vid, V4L_VIDEO,
+						NULL, NONE);
+		if (!vid)
+			break;
+		printf("Video device: %s\n", vid);
+
+		for (i = 0; i <= SND_HW; i++)
+			print_all_associated_devices(md, vid, i);
+	} while (vid);
 
-	alsa = get_not_associated_device(md, NULL, SND_OUT, V4L_VIDEO);
-	if (alsa)
-		printf("Alsa output device: %s\n", alsa);
+	print_all_alsa_independent_playback(md);
 
 	free_media_devices(md);
 
-- 
2.7.4