diff options
Diffstat (limited to 'components/volume.c')
| -rwxr-xr-x | components/volume.c | 219 |
1 files changed, 219 insertions, 0 deletions
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 |