Allow querying the soundfont sample length and format type

OpenAL32/Include/alMain.h

@@ -35,6 +35,7 @@
 #define AL_MIDI_BANK_SOFT                        0x9996
 #define AL_PRESETS_SIZE_SOFT                     0x9995
 #define AL_PRESETS_SOFT                          0x9994
+#define AL_FORMAT_TYPE_SOFT                      0x1991
 #define AL_NOTEOFF_SOFT                          0x0080
 #define AL_NOTEON_SOFT                           0x0090
 #define AL_AFTERTOUCH_SOFT                       0x00A0

OpenAL32/alSoundfont.c

@@ -231,6 +231,14 @@ AL_API void AL_APIENTRY alGetSoundfontivSOFT(ALuint id, ALenum param, ALint *val
                 values[i] = sfont->Presets[i]->id;
             break;
 
+        case AL_SAMPLE_LENGTH_SOFT:
+            values[0] = sfont->NumSamples;
+            break;
+
+        case AL_FORMAT_TYPE_SOFT:
+            values[0] = AL_SHORT_SOFT;
+            break;
+
         default:
             SET_ERROR_AND_GOTO(context, AL_INVALID_ENUM, done);
     }