Sound (Haiku): add support

Author: mmuman

src/detection/sound/sound_haiku.cpp

@@ -2,21 +2,76 @@ extern "C"
 {
 #include "sound.h"
 }
+#include <MediaAddOn.h>
+#include <MediaNode.h>
 #include <MediaRoster.h>
+#include <ParameterWeb.h>
 
-const char* ffDetectSound(FF_MAYBE_UNUSED FFlist* devices /* List of FFSoundDevice */)
+const char* ffDetectSound(FFlist* devices /* List of FFSoundDevice */)
 {
     BMediaRoster* roster = BMediaRoster::Roster();
     media_node mediaNode;
+    live_node_info liveInfo;
+    dormant_node_info dormantInfo;
+    status_t status;
 
-    roster->GetAudioOutput(&mediaNode);
+    if (roster->GetAudioOutput(&mediaNode) != B_OK)
+        return NULL;
+
+    FFSoundDevice* device = (FFSoundDevice*)ffListAdd(devices);
+    if (roster->GetDormantNodeFor(mediaNode, &dormantInfo) == B_OK)
+    {
+        ffStrbufInitS(&device->identifier, dormantInfo.name);
+    }
+    if (roster->GetLiveNodeInfo(mediaNode, &liveInfo) == B_OK)
+    {
+        ffStrbufInitS(&device->name, liveInfo.name);
+        ffStrbufTrimRightSpace(&device->name);
+    }
+    ffStrbufInitF(&device->platformApi, "%s", "MediaKit");
+    // We'll check the Mixer actually
+    device->volume = (uint8_t) 100;
+    device->active = true;
+    device->main = true;
+
+    roster->ReleaseNode(mediaNode);
+
+    media_node mixer;
+    status = roster->GetAudioMixer(&mixer);
+    if (status != B_OK)
+        return NULL;
 
-    int32 mediaOutputCount = 0;
-    roster->GetAllOutputsFor(mediaNode, NULL, 0, &mediaOutputCount);
-    if (mediaOutputCount == 0)
+    BParameterWeb *web;
+    status = roster->GetParameterWebFor(mixer, &web);
+    roster->ReleaseNode(mixer); // the web is all we need :-)
+    if (status != B_OK)
         return NULL;
 
-    // TODO: Implement the rest of the function
+    BContinuousParameter *gain = NULL;
+    BParameter *mute = NULL;
+    BParameter *parameter;
+    for (int32 index = 0; (parameter = web->ParameterAt(index)) != NULL; index++) {
+        // assume the mute preceding master gain control
+        if (!strcmp(parameter->Kind(), B_MUTE))
+            mute = parameter;
+
+        if (!strcmp(parameter->Kind(), B_MASTER_GAIN)) {
+            // Can not use dynamic_cast due to fno-rtti
+            //gain = dynamic_cast<BContinuousParameter *>(parameter);
+            gain = (BContinuousParameter *)(parameter);
+            break;
+        }
+    }
+
+    if (gain == NULL)
+        return NULL;
+
+    float volume = 0.0;
+    bigtime_t when;
+    size_t size = sizeof(volume);
+    gain->GetValue(&volume, &size, &when);
+
+    device->volume = (uint8_t) (100 * (volume - gain->MinValue()) / (gain->MaxValue() - gain->MinValue()));
 
-    return "Not supported on this platform";
+    return NULL;
 }