aboutsummaryrefslogtreecommitdiffstats
path: root/src/mixer/oss_mixer.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/mixer/oss_mixer.c')
-rw-r--r--src/mixer/oss_mixer.c197
1 files changed, 197 insertions, 0 deletions
diff --git a/src/mixer/oss_mixer.c b/src/mixer/oss_mixer.c
new file mode 100644
index 000000000..ca4027f75
--- /dev/null
+++ b/src/mixer/oss_mixer.c
@@ -0,0 +1,197 @@
+
+#include <glib.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "../output_api.h"
+#include "../mixer.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 {
+ const char *device;
+ const char *control;
+ int device_fd;
+ int volume_control;
+};
+
+struct oss_mixer *oss_mixer_init(void);
+void oss_mixer_finish(struct oss_mixer *am);
+void oss_mixer_configure(struct oss_mixer *am, ConfigParam *param);
+bool oss_mixer_open(struct oss_mixer *am);
+bool oss_mixer_control(struct oss_mixer *am, int cmd, void *arg);
+void oss_mixer_close(struct oss_mixer *am);
+
+struct oss_mixer *
+oss_mixer_init(void)
+{
+ struct oss_mixer *om = g_malloc(sizeof(struct oss_mixer));
+ om->device = NULL;
+ om->control = NULL;
+ om->device_fd = -1;
+ om->volume_control = SOUND_MIXER_PCM;
+ return om;
+}
+
+void
+oss_mixer_finish(struct oss_mixer *om)
+{
+ g_free(om);
+}
+
+void
+oss_mixer_configure(struct oss_mixer *om, ConfigParam *param)
+{
+ BlockParam *bp;
+ bp = getBlockParam(param, "mix_device");
+ if (bp) {
+ om->device = bp->value;
+ }
+ bp = getBlockParam(param, "mix_control");
+ if (bp) {
+ om->control = bp->value;
+ }
+}
+
+void
+oss_mixer_close(struct oss_mixer *om)
+{
+ if (om->device_fd != -1)
+ while (close(om->device_fd) && errno == EINTR) ;
+ om->device_fd = -1;
+}
+
+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 (strncasecmp(name, labels[i], name_length) == 0 &&
+ (labels[i][name_length] == 0 ||
+ labels[i][name_length] == ' '))
+ return i;
+ }
+ return -1;
+}
+
+bool
+oss_mixer_open(struct oss_mixer *om)
+{
+ const char *device = VOLUME_MIXER_OSS_DEFAULT;
+
+ if (om->device) {
+ device = om->device;
+ }
+
+ if ((om->device_fd = open(device, O_RDONLY)) < 0) {
+ g_warning("Unable to open oss mixer \"%s\"\n", device);
+ return false;
+ }
+
+ if (om->control) {
+ int i;
+ 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(om);
+ return false;
+ }
+ i = oss_find_mixer(om->control);
+
+ if (i < 0) {
+ g_warning("mixer control \"%s\" not found\n",
+ om->control);
+ oss_mixer_close(om);
+ return false;
+ } else if (!((1 << i) & devmask)) {
+ g_warning("mixer control \"%s\" not usable\n",
+ om->control);
+ oss_mixer_close(om);
+ return false;
+ }
+ om->volume_control = i;
+ }
+ return true;
+}
+
+bool
+oss_mixer_control(struct oss_mixer *om, int cmd, void *arg)
+{
+ switch (cmd) {
+ case AC_MIXER_CONFIGURE:
+ oss_mixer_configure(om, (ConfigParam *)arg);
+ //if (om->device_fd >= 0)
+ oss_mixer_close(om);
+ return true;
+ break;
+ case AC_MIXER_GETVOL:
+ {
+ int left, right, level;
+ int *ret;
+
+ if (om->device_fd < 0 && !oss_mixer_open(om)) {
+ return false;
+ }
+
+ if (ioctl(om->device_fd, MIXER_READ(om->volume_control), &level) < 0) {
+ oss_mixer_close(om);
+ 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);
+ }
+ ret = (int *) arg;
+ *ret = left;
+ return true;
+ }
+ case AC_MIXER_SETVOL:
+ {
+ int new;
+ int level;
+ int *value = arg;
+
+ if (om->device_fd < 0 && !oss_mixer_open(om)) {
+ return false;
+ }
+
+ new = *value;
+ if (new < 0) {
+ new = 0;
+ } else if (new > 100) {
+ new = 100;
+ }
+
+ level = (new << 8) + new;
+
+ if (ioctl(om->device_fd, MIXER_WRITE(om->volume_control), &level) < 0) {
+ g_warning("unable to set oss volume\n");
+ oss_mixer_close(om);
+ return false;
+ }
+ return true;
+ }
+ default:
+ g_warning("Unsuported oss control\n");
+ break;
+ }
+ return false;
+}