From d1f0177d8d525eac0e0795d67467b09b57dbe7b0 Mon Sep 17 00:00:00 2001
From: Bradley Taunt <bt@btxx.org>
Date: Thu, 18 Jan 2024 12:53:45 -0500
Subject: Initial commit on cgit platform

---
 components/volume.c | 219 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 219 insertions(+)
 create mode 100755 components/volume.c

(limited to 'components/volume.c')

diff --git a/components/volume.c b/components/volume.c
new file mode 100755
index 0000000..6cec556
--- /dev/null
+++ b/components/volume.c
@@ -0,0 +1,219 @@
+/* See LICENSE file for copyright and license details. */
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+
+#include "../slstatus.h"
+#include "../util.h"
+
+#if defined(__OpenBSD__) | defined(__FreeBSD__)
+	#include <poll.h>
+	#include <sndio.h>
+	#include <stdlib.h>
+	#include <sys/queue.h>
+
+	struct control {
+		LIST_ENTRY(control)	next;
+		unsigned int		addr;
+	#define CTRL_NONE	0
+	#define CTRL_LEVEL	1
+	#define CTRL_MUTE	2
+		unsigned int		type;
+		unsigned int		maxval;
+		unsigned int		val;
+	};
+
+	static LIST_HEAD(, control) controls = LIST_HEAD_INITIALIZER(controls);
+	static struct pollfd *pfds;
+	static struct sioctl_hdl *hdl;
+	static int initialized;
+
+	/*
+	 * Call-back to obtain the description of all audio controls.
+	 */
+	static void
+	ondesc(void *unused, struct sioctl_desc *desc, int val)
+	{
+		struct control *c, *ctmp;
+		unsigned int type = CTRL_NONE;
+
+		if (desc == NULL)
+			return;
+
+		/* Delete existing audio control with the same address. */
+		LIST_FOREACH_SAFE(c, &controls, next, ctmp) {
+			if (desc->addr == c->addr) {
+				LIST_REMOVE(c, next);
+				free(c);
+				break;
+			}
+		}
+
+		/* Only match output.level and output.mute audio controls. */
+		if (desc->group[0] != 0 ||
+		    strcmp(desc->node0.name, "output") != 0)
+			return;
+		if (desc->type == SIOCTL_NUM &&
+		    strcmp(desc->func, "level") == 0)
+			type = CTRL_LEVEL;
+		else if (desc->type == SIOCTL_SW &&
+			 strcmp(desc->func, "mute") == 0)
+			type = CTRL_MUTE;
+		else
+			return;
+
+		c = malloc(sizeof(struct control));
+		if (c == NULL) {
+			warn("sndio: failed to allocate audio control\n");
+			return;
+		}
+
+		c->addr = desc->addr;
+		c->type = type;
+		c->maxval = desc->maxval;
+		c->val = val;
+		LIST_INSERT_HEAD(&controls, c, next);
+	}
+
+	/*
+	 * Call-back invoked whenever an audio control changes.
+	 */
+	static void
+	onval(void *unused, unsigned int addr, unsigned int val)
+	{
+		struct control *c;
+
+		LIST_FOREACH(c, &controls, next) {
+			if (c->addr == addr)
+				break;
+		}
+		c->val = val;
+	}
+
+	static void
+	cleanup(void)
+	{
+		struct control *c;
+
+		if (hdl) {
+			sioctl_close(hdl);
+			hdl = NULL;
+		}
+
+		free(pfds);
+		pfds = NULL;
+
+		while (!LIST_EMPTY(&controls)) {
+			c = LIST_FIRST(&controls);
+			LIST_REMOVE(c, next);
+			free(c);
+		}
+	}
+
+	static int
+	init(void)
+	{
+		hdl = sioctl_open(SIO_DEVANY, SIOCTL_READ, 0);
+		if (hdl == NULL) {
+			warn("sndio: cannot open device");
+			goto failed;
+		}
+
+		if (!sioctl_ondesc(hdl, ondesc, NULL)) {
+			warn("sndio: cannot set control description call-back");
+			goto failed;
+		}
+
+		if (!sioctl_onval(hdl, onval, NULL)) {
+			warn("sndio: cannot set control values call-back");
+			goto failed;
+		}
+
+		pfds = calloc(sioctl_nfds(hdl), sizeof(struct pollfd));
+		if (pfds == NULL) {
+			warn("sndio: cannot allocate pollfd structures");
+			goto failed;
+		}
+
+		return 1;
+	failed:
+		cleanup();
+		return 0;
+	}
+
+	const char *
+	vol_perc(const char *unused)
+	{
+		struct control *c;
+		int n, v, value;
+
+		if (!initialized)
+			initialized = init();
+
+		if (hdl == NULL)
+			return NULL;
+
+		n = sioctl_pollfd(hdl, pfds, POLLIN);
+		if (n > 0) {
+			n = poll(pfds, n, 0);
+			if (n > 0) {
+				if (sioctl_revents(hdl, pfds) & POLLHUP) {
+					warn("sndio: disconnected");
+					cleanup();
+					initialized = 0;
+					return NULL;
+				}
+			}
+		}
+
+		value = 100;
+		LIST_FOREACH(c, &controls, next) {
+			if (c->type == CTRL_MUTE && c->val == 1)
+				value = 0;
+			else if (c->type == CTRL_LEVEL) {
+				v = (c->val * 100 + c->maxval / 2) / c->maxval;
+				/* For multiple channels return the minimum. */
+				if (v < value)
+					value = v;
+			}
+		}
+
+		return bprintf("%d", value);
+	}
+#else
+	#include <sys/soundcard.h>
+
+	const char *
+	vol_perc(const char *card)
+	{
+		size_t i;
+		int v, afd, devmask;
+		char *vnames[] = SOUND_DEVICE_NAMES;
+
+		if ((afd = open(card, O_RDONLY | O_NONBLOCK)) < 0) {
+			warn("open '%s':", card);
+			return NULL;
+		}
+
+		if (ioctl(afd, (int)SOUND_MIXER_READ_DEVMASK, &devmask) < 0) {
+			warn("ioctl 'SOUND_MIXER_READ_DEVMASK':");
+			close(afd);
+			return NULL;
+		}
+		for (i = 0; i < LEN(vnames); i++) {
+			if (devmask & (1 << i) && !strcmp("vol", vnames[i])) {
+				if (ioctl(afd, MIXER_READ(i), &v) < 0) {
+					warn("ioctl 'MIXER_READ(%ld)':", i);
+					close(afd);
+					return NULL;
+				}
+			}
+		}
+
+		close(afd);
+
+		return bprintf("%d", v & 0xff);
+	}
+#endif
-- 
cgit v1.2.3-54-g00ecf