#include "../output_api.h" #include "../mixer_api.h" #include <glib.h> #include <alsa/asoundlib.h> #define VOLUME_MIXER_ALSA_DEFAULT "default" #define VOLUME_MIXER_ALSA_CONTROL_DEFAULT "PCM" struct alsa_mixer { char *device; char *control; snd_mixer_t *handle; snd_mixer_elem_t *elem; long volume_min; long volume_max; int volume_set; }; static struct mixer_data * alsa_mixer_init(void) { struct alsa_mixer *am = g_malloc(sizeof(struct alsa_mixer)); am->device = NULL; am->control = NULL; am->handle = NULL; am->elem = NULL; am->volume_min = 0; am->volume_max = 0; am->volume_set = -1; return (struct mixer_data *)am; } static void alsa_mixer_finish(struct mixer_data *data) { struct alsa_mixer *am = (struct alsa_mixer *)data; if (am->device) g_free(am->device); if (am->control) g_free(am->control); g_free(am); } static void alsa_mixer_configure(struct mixer_data *data, ConfigParam *param) { struct alsa_mixer *am = (struct alsa_mixer *)data; BlockParam *bp; if ((bp = getBlockParam(param, "mixer_device"))) { if (am->device) g_free(am->device); am->device = g_strdup(bp->value); } if ((bp = getBlockParam(param, "mixer_control"))) { if (am->control) g_free(am->control); am->control = g_strdup(bp->value); } } static void alsa_mixer_close(struct mixer_data *data) { struct alsa_mixer *am = (struct alsa_mixer *)data; if (am->handle) snd_mixer_close(am->handle); am->handle = NULL; } static bool alsa_mixer_open(struct mixer_data *data) { struct alsa_mixer *am = (struct alsa_mixer *)data; int err; snd_mixer_elem_t *elem; const char *control_name = VOLUME_MIXER_ALSA_CONTROL_DEFAULT; const char *device = VOLUME_MIXER_ALSA_DEFAULT; if (am->device) { device = am->device; } err = snd_mixer_open(&am->handle, 0); snd_config_update_free_global(); if (err < 0) { g_warning("problems opening alsa mixer: %s\n", snd_strerror(err)); return false; } if ((err = snd_mixer_attach(am->handle, device)) < 0) { g_warning("problems attaching alsa mixer: %s\n", snd_strerror(err)); alsa_mixer_close(data); return false; } if ((err = snd_mixer_selem_register(am->handle, NULL, NULL)) < 0) { g_warning("problems snd_mixer_selem_register'ing: %s\n", snd_strerror(err)); alsa_mixer_close(data); return false; } if ((err = snd_mixer_load(am->handle)) < 0) { g_warning("problems snd_mixer_selem_register'ing: %s\n", snd_strerror(err)); alsa_mixer_close(data); return false; } elem = snd_mixer_first_elem(am->handle); if (am->control) { control_name = am->control; } while (elem) { if (snd_mixer_elem_get_type(elem) == SND_MIXER_ELEM_SIMPLE) { if (strcasecmp(control_name, snd_mixer_selem_get_name(elem)) == 0) { break; } } elem = snd_mixer_elem_next(elem); } if (elem) { am->elem = elem; snd_mixer_selem_get_playback_volume_range(am->elem, &am->volume_min, &am->volume_max); return true; } g_warning("can't find alsa mixer control \"%s\"\n", control_name); alsa_mixer_close(data); return false; } static bool alsa_mixer_control(struct mixer_data *data, int cmd, void *arg) { struct alsa_mixer *am = (struct alsa_mixer *)data; switch (cmd) { case AC_MIXER_CONFIGURE: alsa_mixer_configure(data, (ConfigParam *)arg); if (am->handle) alsa_mixer_close(data); return true; case AC_MIXER_GETVOL: { int err; int ret, *volume = arg; long level; if (!am->handle && !alsa_mixer_open(data)) { return false; } if ((err = snd_mixer_handle_events(am->handle)) < 0) { g_warning("problems getting alsa volume: %s (snd_mixer_%s)\n", snd_strerror(err), "handle_events"); alsa_mixer_close(data); return false; } if ((err = snd_mixer_selem_get_playback_volume(am->elem, SND_MIXER_SCHN_FRONT_LEFT, &level)) < 0) { g_warning("problems getting alsa volume: %s (snd_mixer_%s)\n", snd_strerror(err), "selem_get_playback_volume"); alsa_mixer_close(data); return false; } ret = ((am->volume_set / 100.0) * (am->volume_max - am->volume_min) + am->volume_min) + 0.5; if (am->volume_set > 0 && ret == level) { ret = am->volume_set; } else { ret = (int)(100 * (((float)(level - am->volume_min)) / (am->volume_max - am->volume_min)) + 0.5); } *volume = ret; return true; } case AC_MIXER_SETVOL: { float vol; long level; int *volume = arg; int err; if (!am->handle && !alsa_mixer_open(data)) { return false; } vol = *volume; am->volume_set = vol + 0.5; am->volume_set = am->volume_set > 100 ? 100 : (am->volume_set < 0 ? 0 : am->volume_set); level = (long)(((vol / 100.0) * (am->volume_max - am->volume_min) + am->volume_min) + 0.5); level = level > am->volume_max ? am->volume_max : level; level = level < am->volume_min ? am->volume_min : level; if ((err = snd_mixer_selem_set_playback_volume_all(am->elem, level)) < 0) { g_warning("problems setting alsa volume: %s\n", snd_strerror(err)); alsa_mixer_close(data); return false; } return true; } default: g_warning("Unsuported alsa control\n"); break; } return false; } struct mixer_plugin alsa_mixer = { .init = alsa_mixer_init, .finish = alsa_mixer_finish, .configure = alsa_mixer_configure, .open = alsa_mixer_open, .control = alsa_mixer_control, .close = alsa_mixer_close };