diff options
Diffstat (limited to 'src/print_volume.c')
| -rw-r--r-- | src/print_volume.c | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/src/print_volume.c b/src/print_volume.c new file mode 100644 index 0000000..0eca0c0 --- /dev/null +++ b/src/print_volume.c @@ -0,0 +1,154 @@ +// vim:ts=8:expandtab +#include <time.h> +#include <string.h> +#include <stdlib.h> +#include <stdio.h> + +#ifdef LINUX +#include <alsa/asoundlib.h> +#include <alloca.h> +#endif + +#include "i3status.h" +#include "queue.h" + +#ifdef LINUX +struct mixer_hdl { + char *device; + char *mixer; + int mixer_idx; + snd_mixer_selem_id_t *sid; + snd_mixer_t *m; + snd_mixer_elem_t *elem; + long min; + long max; + + TAILQ_ENTRY(mixer_hdl) handles; +}; + +TAILQ_HEAD(handles_head, mixer_hdl) cached = TAILQ_HEAD_INITIALIZER(cached); +#endif + +static void free_hdl(struct mixer_hdl *hdl) { + free(hdl->device); + free(hdl->mixer); + free(hdl); +} + +void print_volume(const char *fmt, const char *device, const char *mixer, int mixer_idx) { +/* Printing volume only works with ALSA at the moment */ +#ifndef LINUX + return; +#endif + /* Check if we already opened the mixer and get the handle + * from cache if so */ + bool found = false; + int err; + struct mixer_hdl *hdl; + TAILQ_FOREACH(hdl, &cached, handles) { + if (strcmp(hdl->device, device) != 0 || + strcmp(hdl->mixer, mixer) != 0 || + hdl->mixer_idx != mixer_idx) + continue; + found = true; + break; + } + + if (!found) { + if ((hdl = calloc(sizeof(struct mixer_hdl), 1)) == NULL) + return; + + if ((hdl->device = strdup(device)) == NULL) { + free(hdl); + return; + } + + if ((hdl->mixer = strdup(mixer)) == NULL) { + free(hdl->device); + free(hdl); + return; + } + + hdl->mixer_idx = mixer_idx; + snd_mixer_selem_id_malloc(&(hdl->sid)); + if (hdl->sid == NULL) { + free_hdl(hdl); + return; + } + + if ((err = snd_mixer_open(&(hdl->m), 0)) < 0) { + fprintf(stderr, "ALSA: Cannot open mixer: %s\n", snd_strerror(err)); + free_hdl(hdl); + return; + } + + /* Attach this mixer handle to the given device */ + if ((err = snd_mixer_attach(hdl->m, device)) < 0) { + fprintf(stderr, "ALSA: Cannot attach mixer to device: %s\n", snd_strerror(err)); + snd_mixer_close(hdl->m); + free_hdl(hdl); + return; + } + + /* Register this mixer */ + if ((err = snd_mixer_selem_register(hdl->m, NULL, NULL)) < 0) { + fprintf(stderr, "ALSA: snd_mixer_selem_register: %s\n", snd_strerror(err)); + snd_mixer_close(hdl->m); + free_hdl(hdl); + return; + } + + if ((err = snd_mixer_load(hdl->m)) < 0) { + fprintf(stderr, "ALSA: snd_mixer_load: %s\n", snd_strerror(err)); + snd_mixer_close(hdl->m); + free_hdl(hdl); + return; + } + + /* Find the given mixer */ + snd_mixer_selem_id_set_index(hdl->sid, mixer_idx); + snd_mixer_selem_id_set_name(hdl->sid, mixer); + if (!(hdl->elem = snd_mixer_find_selem(hdl->m, hdl->sid))) { + fprintf(stderr, "ALSA: Cannot find mixer %s (index %i)\n", + snd_mixer_selem_id_get_name(hdl->sid), snd_mixer_selem_id_get_index(hdl->sid)); + snd_mixer_close(hdl->m); + free_hdl(hdl); + return; + } + + /* Get the volume range to convert the volume later */ + snd_mixer_selem_get_playback_volume_range(hdl->elem, &(hdl->min), &(hdl->max)); + TAILQ_INSERT_TAIL(&cached, hdl, handles); + } + + long val; + snd_mixer_handle_events (hdl->m); + snd_mixer_selem_get_playback_volume (hdl->elem, 0, &val); + int avg; + if (hdl->max != 100) { + float avgf = ((float)val / hdl->max) * 100; + avg = (int)avgf; + avg = (avgf - avg < 0.5 ? avg : (avg+1)); + } else avg = (int)val; + + /* Check for mute */ + if (snd_mixer_selem_has_playback_switch(hdl->elem)) { + int pbval; + if ((err = snd_mixer_selem_get_playback_switch(hdl->elem, 0, &pbval)) < 0) + fprintf (stderr, "ALSA: playback_switch: %s\n", snd_strerror(err)); + if (!pbval) + avg = 0; + } + + const char *walk = fmt; + for (; *walk != '\0'; walk++) { + if (*walk != '%') { + putchar(*walk); + continue; + } + if (BEGINS_WITH(walk+1, "volume")) { + printf("%d%%", avg); + walk += strlen("volume"); + } + } +} |