mixer/{oss,alsa}: renamed the mixer source files

1 files changed, 222 insertions, 0 deletions

diff --git a/src/mixer/alsa_mixer_plugin.c b/src/mixer/alsa_mixer_plugin.c
new file mode 100644
index 000000000..1a32ea9e1
--- /dev/null
+++ b/src/mixer/alsa_mixer_plugin.c
@@ -0,0 +1,222 @@
+/*
+ * Copyright (C) 2003-2009 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "mixer_api.h"
+#include "output_api.h"
+
+#include <glib.h>
+#include <alsa/asoundlib.h>
+
+#define VOLUME_MIXER_ALSA_DEFAULT		"default"
+#define VOLUME_MIXER_ALSA_CONTROL_DEFAULT	"PCM"
+#define VOLUME_MIXER_ALSA_INDEX_DEFAULT		0
+
+struct alsa_mixer {
+	/** the base mixer class */
+	struct mixer base;
+
+	const char *device;
+	const char *control;
+	unsigned int index;
+
+	snd_mixer_t *handle;
+	snd_mixer_elem_t *elem;
+	long volume_min;
+	long volume_max;
+	int volume_set;
+};
+
+static struct mixer *
+alsa_mixer_init(const struct config_param *param)
+{
+	struct alsa_mixer *am = g_new(struct alsa_mixer, 1);
+
+	mixer_init(&am->base, &alsa_mixer_plugin);
+
+	am->device = config_get_block_string(param, "mixer_device",
+					     VOLUME_MIXER_ALSA_DEFAULT);
+	am->control = config_get_block_string(param, "mixer_control",
+					      VOLUME_MIXER_ALSA_CONTROL_DEFAULT);
+	am->index = config_get_block_unsigned(param, "mixer_index",
+					      VOLUME_MIXER_ALSA_INDEX_DEFAULT);
+
+	return &am->base;
+}
+
+static void
+alsa_mixer_finish(struct mixer *data)
+{
+	struct alsa_mixer *am = (struct alsa_mixer *)data;
+
+	g_free(am);
+
+	/* free libasound's config cache */
+	snd_config_update_free_global();
+}
+
+static void
+alsa_mixer_close(struct mixer *data)
+{
+	struct alsa_mixer *am = (struct alsa_mixer *)data;
+
+	assert(am->handle != NULL);
+
+	snd_mixer_close(am->handle);
+}
+
+static bool
+alsa_mixer_open(struct mixer *data)
+{
+	struct alsa_mixer *am = (struct alsa_mixer *)data;
+	int err;
+	snd_mixer_elem_t *elem;
+
+	am->volume_set = -1;
+
+	err = snd_mixer_open(&am->handle, 0);
+	if (err < 0) {
+		g_warning("problems opening alsa mixer: %s\n", snd_strerror(err));
+		return false;
+	}
+
+	if ((err = snd_mixer_attach(am->handle, am->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);
+
+	while (elem) {
+		if (snd_mixer_elem_get_type(elem) == SND_MIXER_ELEM_SIMPLE) {
+			if ((g_ascii_strcasecmp(am->control,
+						snd_mixer_selem_get_name(elem)) == 0) &&
+			    (am->index == snd_mixer_selem_get_index(elem))) {
+				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", am->control);
+
+	alsa_mixer_close(data);
+	return false;
+}
+
+static int
+alsa_mixer_get_volume(struct mixer *mixer)
+{
+	struct alsa_mixer *am = (struct alsa_mixer *)mixer;
+	int err;
+	int ret;
+	long level;
+
+	assert(am->handle != NULL);
+
+	err = snd_mixer_handle_events(am->handle);
+	if (err < 0) {
+		g_warning("problems getting alsa volume: %s (snd_mixer_%s)\n",
+			  snd_strerror(err), "handle_events");
+		return false;
+	}
+
+	err = snd_mixer_selem_get_playback_volume(am->elem,
+						  SND_MIXER_SCHN_FRONT_LEFT,
+						  &level);
+	if (err < 0) {
+		g_warning("problems getting alsa volume: %s (snd_mixer_%s)\n",
+			  snd_strerror(err), "selem_get_playback_volume");
+		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);
+	}
+
+	return ret;
+}
+
+static bool
+alsa_mixer_set_volume(struct mixer *mixer, unsigned volume)
+{
+	struct alsa_mixer *am = (struct alsa_mixer *)mixer;
+	float vol;
+	long level;
+	int err;
+
+	assert(am->handle != NULL);
+
+	vol = volume;
+
+	am->volume_set = vol + 0.5;
+
+	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;
+
+	err = snd_mixer_selem_set_playback_volume_all(am->elem, level);
+	if (err < 0) {
+		g_warning("problems setting alsa volume: %s\n",
+			  snd_strerror(err));
+		return false;
+	}
+
+	return true;
+}
+
+const struct mixer_plugin alsa_mixer_plugin = {
+	.init = alsa_mixer_init,
+	.finish = alsa_mixer_finish,
+	.open = alsa_mixer_open,
+	.close = alsa_mixer_close,
+	.get_volume = alsa_mixer_get_volume,
+	.set_volume = alsa_mixer_set_volume,
+	.global = true,
+};