Add support for handling external sink/source volume change events

[apps/mixer.git] / app / paclient.cpp

diff --git a/app/paclient.cpp b/app/paclient.cpp
index 58d8fad..afe0fad 100644 (file)
--- a/app/paclient.cpp
+++ b/app/paclient.cpp
@@ -37,15 +37,19 @@ void PaClient::close()
        m_init = false;
 }
 
-static void set_sink_volume_cb(pa_context *c, int success, void *data __attribute__((unused)))
+static void set_sink_volume_cb(pa_context *c, int success, void *data)
 {
+       Q_UNUSED(data);
+
        if (!success)
                qWarning() << "PaClient: set sink volume: " <<
                        pa_strerror(pa_context_errno(c));
 }
 
-static void set_source_volume_cb(pa_context *c, int success, void *data __attribute__((unused)))
+static void set_source_volume_cb(pa_context *c, int success, void *data)
 {
+       Q_UNUSED(data);
+
        if (!success)
                qWarning() << "PaClient: set source volume: " <<
                        pa_strerror(pa_context_errno(c));
@@ -112,8 +116,8 @@ void get_sink_list_cb(pa_context *c,
                int eol,
                void *data)
 {
-       int chan;
        PaClient *self = reinterpret_cast<PaClient*>(data);
+       int chan;
 
        if(eol < 0) {
                qWarning() << "PaClient: get sink list: " <<
@@ -132,6 +136,87 @@ void get_sink_list_cb(pa_context *c,
        }
 }
 
+void get_sink_info_change_cb(pa_context *c,
+                            const pa_sink_info *i,
+                            int eol,
+                            void *data)
+{
+       Q_UNUSED(c);
+       Q_ASSERT(i);
+       Q_ASSERT(data);
+
+       if (eol) return;
+
+       for (int chan = 0; chan < i->channel_map.channels; chan++) {
+               PaClient *self = reinterpret_cast<PaClient*>(data);
+               QHash<int, pa_cvolume *> states = self->sink_states();
+               pa_cvolume *cvolume = states.value(i->index);
+               // Check each channel for volume change
+               if (cvolume->values[chan] != i->volume.values[chan]) {
+                       // On change, update cache and signal
+                       cvolume->values[chan] = i->volume.values[chan];
+                       emit self->volumeExternallyChanged(C_SINK, i->index, chan, i->volume.values[chan]);
+               }
+       }
+}
+
+void get_source_info_change_cb(pa_context *c,
+                              const pa_source_info *i,
+                              int eol,
+                              void *data)
+{
+       Q_UNUSED(c);
+       Q_ASSERT(i);
+       Q_ASSERT(data);
+
+       if (eol) return;
+
+       for (int chan = 0; chan < i->channel_map.channels; chan++) {
+               PaClient *self = reinterpret_cast<PaClient*>(data);
+               QHash<int, pa_cvolume *> states = self->source_states();
+               pa_cvolume *cvolume = states.value(i->index);
+               // Check each channel for volume change
+               if (cvolume->values[chan] != i->volume.values[chan]) {
+                       // On change, update cache and signal
+                       cvolume->values[chan] = i->volume.values[chan];
+                       emit self->volumeExternallyChanged(C_SOURCE, i->index, chan, i->volume.values[chan]);
+               }
+       }
+}
+
+
+void subscribe_cb(pa_context *c,
+                 pa_subscription_event_type_t type,
+                 uint32_t index,
+                 void *data)
+{
+       pa_operation *o;
+
+       if ((type & PA_SUBSCRIPTION_EVENT_TYPE_MASK) != PA_SUBSCRIPTION_EVENT_CHANGE) {
+               qWarning("PaClient: unhandled subscribe event operation");
+               return;
+       }
+
+       switch (type & PA_SUBSCRIPTION_EVENT_FACILITY_MASK) {
+               case PA_SUBSCRIPTION_EVENT_SINK:
+                       if (!(o = pa_context_get_sink_info_by_index(c, index, get_sink_info_change_cb, data))) {
+                               qWarning() << "PaClient: get sink info by index: " <<
+                                       pa_strerror(pa_context_errno(c));
+                               return;
+                       }
+                       break;
+               case PA_SUBSCRIPTION_EVENT_SOURCE:
+                       if (!(o = pa_context_get_source_info_by_index(c, index, get_source_info_change_cb, data))) {
+                               qWarning() << "PaClient: get source info by index: " <<
+                                       pa_strerror(pa_context_errno(c));
+                               return;
+                       }
+                       break;
+               default:
+                       qWarning("PaClient: unhandled subscribe event facility");
+       }
+}
+
 void context_state_cb(pa_context *c, void *data)
 {
        pa_operation *o;
@@ -155,6 +240,13 @@ void context_state_cb(pa_context *c, void *data)
                                        pa_strerror(pa_context_errno(c));
                                return;
                        }
+                       pa_operation_unref(o);
+                       pa_context_set_subscribe_callback(c, subscribe_cb, data);
+                       if (!(o = pa_context_subscribe(c, (pa_subscription_mask_t)(PA_SUBSCRIPTION_MASK_SINK | PA_SUBSCRIPTION_MASK_SOURCE), NULL, NULL))) {
+                               qWarning() << "PaClient: subscribe: " <<
+                                       pa_strerror(pa_context_errno(c));
+                               return;
+                       }
                        break;
                case PA_CONTEXT_TERMINATED:
                        self->close();
@@ -212,15 +304,22 @@ void PaClient::init()
 
 void PaClient::addOneControlState(int type, int index, const pa_cvolume *cvolume)
 {
-       int i;
-       pa_cvolume *cvolume_new;
-
-       cvolume_new = new pa_cvolume;
+       pa_cvolume *cvolume_new = new pa_cvolume;
        cvolume_new->channels = cvolume->channels;
-       for (i = 0; i < cvolume->channels; i++)
+       for (int i = 0; i < cvolume->channels; i++)
                cvolume_new->values[i] = cvolume->values[i];
        if (type == C_SINK)
                m_sink_states.insert(index, cvolume_new);
        else if (type == C_SOURCE)
                m_source_states.insert(index, cvolume_new);
 }
+
+QHash<int, pa_cvolume *> PaClient::sink_states(void)
+{
+       return m_sink_states;
+}
+
+QHash<int, pa_cvolume *> PaClient::source_states(void)
+{
+       return m_source_states;
+}