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-rw-r--r--src/mixer/oss_mixer_plugin.c195
1 files changed, 195 insertions, 0 deletions
diff --git a/src/mixer/oss_mixer_plugin.c b/src/mixer/oss_mixer_plugin.c
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+++ b/src/mixer/oss_mixer_plugin.c
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+/*
+ * 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 <assert.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#if defined(__OpenBSD__) || defined(__NetBSD__)
+# include <soundcard.h>
+#else /* !(defined(__OpenBSD__) || defined(__NetBSD__) */
+# include <sys/soundcard.h>
+#endif /* !(defined(__OpenBSD__) || defined(__NetBSD__) */
+
+#define VOLUME_MIXER_OSS_DEFAULT "/dev/mixer"
+
+struct oss_mixer {
+ /** the base mixer class */
+ struct mixer base;
+
+ const char *device;
+ const char *control;
+
+ int device_fd;
+ int volume_control;
+};
+
+static int
+oss_find_mixer(const char *name)
+{
+ const char *labels[SOUND_MIXER_NRDEVICES] = SOUND_DEVICE_LABELS;
+ size_t name_length = strlen(name);
+
+ for (unsigned i = 0; i < SOUND_MIXER_NRDEVICES; i++) {
+ if (g_ascii_strncasecmp(name, labels[i], name_length) == 0 &&
+ (labels[i][name_length] == 0 ||
+ labels[i][name_length] == ' '))
+ return i;
+ }
+ return -1;
+}
+
+static struct mixer *
+oss_mixer_init(const struct config_param *param)
+{
+ struct oss_mixer *om = g_new(struct oss_mixer, 1);
+
+ mixer_init(&om->base, &oss_mixer_plugin);
+
+ om->device = config_get_block_string(param, "mixer_device",
+ VOLUME_MIXER_OSS_DEFAULT);
+ om->control = config_get_block_string(param, "mixer_control", NULL);
+
+ if (om->control != NULL) {
+ om->volume_control = oss_find_mixer(om->control);
+ if (om->volume_control < 0) {
+ g_warning("mixer control \"%s\" not found",
+ om->control);
+ g_free(om);
+ return NULL;
+ }
+ } else
+ om->volume_control = SOUND_MIXER_PCM;
+
+ return &om->base;
+}
+
+static void
+oss_mixer_finish(struct mixer *data)
+{
+ struct oss_mixer *om = (struct oss_mixer *) data;
+
+ g_free(om);
+}
+
+static void
+oss_mixer_close(struct mixer *data)
+{
+ struct oss_mixer *om = (struct oss_mixer *) data;
+
+ assert(om->device_fd >= 0);
+
+ close(om->device_fd);
+}
+
+static bool
+oss_mixer_open(struct mixer *data)
+{
+ struct oss_mixer *om = (struct oss_mixer *) data;
+
+ om->device_fd = open(om->device, O_RDONLY);
+ if (om->device_fd < 0) {
+ g_warning("Unable to open oss mixer \"%s\"\n", om->device);
+ return false;
+ }
+
+ if (om->control) {
+ int devmask = 0;
+
+ if (ioctl(om->device_fd, SOUND_MIXER_READ_DEVMASK, &devmask) < 0) {
+ g_warning("errors getting read_devmask for oss mixer\n");
+ oss_mixer_close(data);
+ return false;
+ }
+
+ if (((1 << om->volume_control) & devmask) == 0) {
+ g_warning("mixer control \"%s\" not usable\n",
+ om->control);
+ oss_mixer_close(data);
+ return false;
+ }
+ }
+ return true;
+}
+
+static int
+oss_mixer_get_volume(struct mixer *mixer)
+{
+ struct oss_mixer *om = (struct oss_mixer *)mixer;
+ int left, right, level;
+ int ret;
+
+ assert(om->device_fd >= 0);
+
+ ret = ioctl(om->device_fd, MIXER_READ(om->volume_control), &level);
+ if (ret < 0) {
+ g_warning("unable to read oss volume\n");
+ return false;
+ }
+
+ left = level & 0xff;
+ right = (level & 0xff00) >> 8;
+
+ if (left != right) {
+ g_warning("volume for left and right is not the same, \"%i\" and "
+ "\"%i\"\n", left, right);
+ }
+
+ return left;
+}
+
+static bool
+oss_mixer_set_volume(struct mixer *mixer, unsigned volume)
+{
+ struct oss_mixer *om = (struct oss_mixer *)mixer;
+ int level;
+ int ret;
+
+ assert(om->device_fd >= 0);
+ assert(volume <= 100);
+
+ level = (volume << 8) + volume;
+
+ ret = ioctl(om->device_fd, MIXER_WRITE(om->volume_control), &level);
+ if (ret < 0) {
+ g_warning("unable to set oss volume\n");
+ return false;
+ }
+
+ return true;
+}
+
+const struct mixer_plugin oss_mixer_plugin = {
+ .init = oss_mixer_init,
+ .finish = oss_mixer_finish,
+ .open = oss_mixer_open,
+ .close = oss_mixer_close,
+ .get_volume = oss_mixer_get_volume,
+ .set_volume = oss_mixer_set_volume,
+ .global = true,
+};