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authorViliam Mateicka <viliam.mateicka@gmail.com>2008-12-31 16:46:41 +0100
committerViliam Mateicka <viliam.mateicka@gmail.com>2008-12-31 16:46:41 +0100
commit9a70c4d06d51cca24dfb93847d1f82187d454e31 (patch)
tree444672f0ab76eca96692560201287d6f7a1a73b5 /src/mixer/alsa_mixer.c
parentdd9af72a744d9c93966f5088931d7edbf28e1d1d (diff)
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Moving mixers to audio outputs
Diffstat (limited to '')
-rw-r--r--src/mixer/alsa_mixer.c206
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;
+}