udev: allow passing of ignore_dB= parameter to alsa modules

src/modules/alsa/alsa-sink.c

@@ -68,6 +68,8 @@
 #define TSCHED_MIN_SLEEP_USEC (10*PA_USEC_PER_MSEC)               /* 10ms -- Sleep at least 10ms on each iteration */
 #define TSCHED_MIN_WAKEUP_USEC (4*PA_USEC_PER_MSEC)               /* 4ms  -- Wakeup at least this long before the buffer runs empty*/
 
+#define VOLUME_ACCURACY (PA_VOLUME_NORM/100)  /* don't require volume adjustments to be perfectly correct. don't necessarily extend granularity in software unless the differences get greater than this level */
+
 struct userdata {
     pa_core *core;
     pa_module *module;
@@ -1034,15 +1036,11 @@ static void sink_get_volume_cb(pa_sink *s) {
     if (pa_cvolume_equal(&u->hardware_volume, &r))
         return;
 
-    s->virtual_volume = u->hardware_volume = r;
+    s->real_volume = u->hardware_volume = r;
-
-    if (u->mixer_path->has_dB) {
-        pa_cvolume reset;
 
     /* Hmm, so the hardware volume changed, let's reset our software volume */
-        pa_cvolume_reset(&reset, s->sample_spec.channels);
+    if (u->mixer_path->has_dB)
-        pa_sink_set_soft_volume(s, &reset);
+        pa_sink_set_soft_volume(s, NULL);
-    }
 }
 
 static void sink_set_volume_cb(pa_sink *s) {
@@ -1055,7 +1053,7 @@ static void sink_set_volume_cb(pa_sink *s) {
     pa_assert(u->mixer_handle);
 
     /* Shift up by the base volume */
-    pa_sw_cvolume_divide_scalar(&r, &s->virtual_volume, s->base_volume);
+    pa_sw_cvolume_divide_scalar(&r, &s->real_volume, s->base_volume);
 
     if (pa_alsa_path_set_volume(u->mixer_path, u->mixer_handle, &s->channel_map, &r) < 0)
         return;
@@ -1066,13 +1064,26 @@ static void sink_set_volume_cb(pa_sink *s) {
     u->hardware_volume = r;
 
     if (u->mixer_path->has_dB) {
+        pa_cvolume new_soft_volume;
+        pa_bool_t accurate_enough;
 
         /* Match exactly what the user requested by software */
-        pa_sw_cvolume_divide(&s->soft_volume, &s->virtual_volume, &u->hardware_volume);
+        pa_sw_cvolume_divide(&new_soft_volume, &s->real_volume, &u->hardware_volume);
 
-        pa_log_debug("Requested volume: %s", pa_cvolume_snprint(t, sizeof(t), &s->virtual_volume));
+        /* If the adjustment to do in software is only minimal we
+         * can skip it. That saves us CPU at the expense of a bit of
+         * accuracy */
+        accurate_enough =
+            (pa_cvolume_min(&new_soft_volume) >= (PA_VOLUME_NORM - VOLUME_ACCURACY)) &&
+            (pa_cvolume_max(&new_soft_volume) <= (PA_VOLUME_NORM + VOLUME_ACCURACY));
+
+        pa_log_debug("Requested volume: %s", pa_cvolume_snprint(t, sizeof(t), &s->real_volume));
         pa_log_debug("Got hardware volume: %s", pa_cvolume_snprint(t, sizeof(t), &u->hardware_volume));
-        pa_log_debug("Calculated software volume: %s", pa_cvolume_snprint(t, sizeof(t), &s->soft_volume));
+        pa_log_debug("Calculated software volume: %s (accurate-enough=%s)", pa_cvolume_snprint(t, sizeof(t), &new_soft_volume),
+                     pa_yes_no(accurate_enough));
+
+        if (!accurate_enough)
+            s->soft_volume = new_soft_volume;
 
     } else {
         pa_log_debug("Wrote hardware volume: %s", pa_cvolume_snprint(t, sizeof(t), &r));
@@ -1080,7 +1091,7 @@ static void sink_set_volume_cb(pa_sink *s) {
         /* We can't match exactly what the user requested, hence let's
          * at least tell the user about it */
 
-        s->virtual_volume = r;
+        s->real_volume = r;
     }
 }
 

src/modules/bluetooth/module-bluetooth-device.c

@@ -1476,12 +1476,12 @@ static void sink_set_volume_cb(pa_sink *s) {
     if (u->profile != PROFILE_HSP)
         return;
 
-    gain = (pa_cvolume_max(&s->virtual_volume) * 15) / PA_VOLUME_NORM;
+    gain = (pa_cvolume_max(&s->real_volume) * 15) / PA_VOLUME_NORM;
 
     if (gain > 15)
         gain = 15;
 
-    pa_cvolume_set(&s->virtual_volume, u->sample_spec.channels, (pa_volume_t) (gain * PA_VOLUME_NORM / 15));
+    pa_cvolume_set(&s->real_volume, u->sample_spec.channels, (pa_volume_t) (gain * PA_VOLUME_NORM / 15));
 
     pa_assert_se(m = dbus_message_new_method_call("org.bluez", u->path, "org.bluez.Headset", "SetSpeakerGain"));
     pa_assert_se(dbus_message_append_args(m, DBUS_TYPE_UINT16, &gain, DBUS_TYPE_INVALID));

src/modules/module-lirc.c

@@ -133,7 +133,7 @@ static void io_callback(pa_mainloop_api *io, pa_io_event *e, int fd, pa_io_event
                                     cv.values[i] = PA_VOLUME_MAX;
                             }
 
-                            pa_sink_set_volume(s, &cv, TRUE, TRUE, TRUE, TRUE);
+                            pa_sink_set_volume(s, &cv, TRUE, TRUE);
                             break;
 
                         case DOWN:
@@ -144,7 +144,7 @@ static void io_callback(pa_mainloop_api *io, pa_io_event *e, int fd, pa_io_event
                                     cv.values[i] = PA_VOLUME_MUTED;
                             }
 
-                            pa_sink_set_volume(s, &cv, TRUE, TRUE, TRUE, TRUE);
+                            pa_sink_set_volume(s, &cv, TRUE, TRUE);
                             break;
 
                         case MUTE:

src/modules/module-udev-detect.c

@@ -39,6 +39,9 @@ PA_MODULE_AUTHOR("Lennart Poettering");
 PA_MODULE_DESCRIPTION("Detect available audio hardware and load matching drivers");
 PA_MODULE_VERSION(PACKAGE_VERSION);
 PA_MODULE_LOAD_ONCE(TRUE);
+PA_MODULE_USAGE(
+        "tsched=<enable system timer based scheduling mode?> "
+        "ignore_dB=<ignore dB information from the device?>");
 
 struct device {
     char *path;
@@ -50,7 +53,9 @@ struct device {
 struct userdata {
     pa_core *core;
     pa_hashmap *devices;
-    pa_bool_t use_tsched;
+
+    pa_bool_t use_tsched:1;
+    pa_bool_t ignore_dB:1;
 
     struct udev* udev;
     struct udev_monitor *monitor;
@@ -62,6 +67,7 @@ struct userdata {
 
 static const char* const valid_modargs[] = {
     "tsched",
+    "ignore_dB",
     NULL
 };
 
@@ -140,12 +146,14 @@ static void card_changed(struct userdata *u, struct udev_device *dev) {
     args = pa_sprintf_malloc("device_id=\"%s\" "
                              "name=\"%s\" "
                              "card_name=\"%s\" "
-                             "tsched=%i "
+                             "tsched=%s "
+                             "ignore_dB=%s "
                              "card_properties=\"module-udev-detect.discovered=1\"",
                              path_get_card_id(path),
                              n,
                              card_name,
-                             (int) u->use_tsched);
+                             pa_yes_no(u->use_tsched),
+                             pa_yes_no(u->ignore_dB));
 
     pa_log_debug("Loading module-alsa-card with arguments '%s'", args);
     m = pa_module_load(u->core, "module-alsa-card", args);
@@ -364,6 +372,7 @@ int pa__init(pa_module *m) {
     struct udev_enumerate *enumerate = NULL;
     struct udev_list_entry *item = NULL, *first = NULL;
     int fd;
+    pa_bool_t use_tsched = TRUE, ignore_dB = FALSE;
 
     pa_assert(m);
 
@@ -375,13 +384,19 @@ int pa__init(pa_module *m) {
     m->userdata = u = pa_xnew0(struct userdata, 1);
     u->core = m->core;
     u->devices = pa_hashmap_new(pa_idxset_string_hash_func, pa_idxset_string_compare_func);
-    u->use_tsched = TRUE;
     u->inotify_fd = -1;
 
-    if (pa_modargs_get_value_boolean(ma, "tsched", &u->use_tsched) < 0) {
+    if (pa_modargs_get_value_boolean(ma, "tsched", &use_tsched) < 0) {
-        pa_log("Failed to parse tsched argument.");
+        pa_log("Failed to parse tsched= argument.");
         goto fail;
     }
+    u->use_tsched = use_tsched;
+
+    if (pa_modargs_get_value_boolean(ma, "ignore_dB", &ignore_dB) < 0) {
+        pa_log("Failed to parse ignore_dB= argument.");
+        goto fail;
+    }
+    u->ignore_dB = ignore_dB;
 
     if (!(u->udev = udev_new())) {
         pa_log("Failed to initialize udev library.");