diff options
Diffstat (limited to 'src/mixer/alsa_mixer.c')
| -rw-r--r-- | src/mixer/alsa_mixer.c | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/src/mixer/alsa_mixer.c b/src/mixer/alsa_mixer.c new file mode 100644 index 000000000..506daf794 --- /dev/null +++ b/src/mixer/alsa_mixer.c @@ -0,0 +1,206 @@ + +#include "../output_api.h" +#include "../mixer.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; +}; + +struct alsa_mixer * +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 am; +} + +void +alsa_mixer_finish(struct alsa_mixer *am) +{ + g_free(am); +} + +void +alsa_mixer_configure(struct alsa_mixer *am, ConfigParam *param) +{ + BlockParam *bp; + + if ((bp = getBlockParam(param, "mix_device"))) + am->device = bp->value; + if ((bp = getBlockParam(param, "mix_control"))) + am->control = bp->value; +} + +void +alsa_mixer_close(struct alsa_mixer *am) +{ + if (am->handle) snd_mixer_close(am->handle); + am->handle = NULL; +} + +bool +alsa_mixer_open(struct alsa_mixer *am) +{ + 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(am); + 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(am); + 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(am); + 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(am); + return false; +} + +bool +alsa_mixer_control(struct alsa_mixer *am, int cmd, void *arg) +{ + switch (cmd) { + case AC_MIXER_CONFIGURE: + alsa_mixer_configure(am, (ConfigParam *)arg); + if (am->handle) + alsa_mixer_close(am); + return true; + case AC_MIXER_GETVOL: + { + int err; + int ret, *volume = arg; + long level; + + if (!am->handle && !alsa_mixer_open(am)) { + 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(am); + 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(am); + 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(am)) { + 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(am); + return false; + } + return true; + } + default: + g_warning("Unsuported alsa control\n"); + break; + } + return false; +} |