Support new SPU voice approach

include/PSX/SPU/spu.hpp

@@ -1,7 +1,32 @@
 #pragma once
-#include "../jabyengine.hpp"
+#include "../System/IOPorts/spu_io.hpp"
 
 namespace JabyEngine {
     namespace SPU {
+        using SRAM_Adr = uint16_t;
+
+        struct Voice {
+            size_t get_id() const {
+                return reinterpret_cast<size_t>(this);
+            }
+
+            SRAM_Adr allocate(size_t size)                               const;
+            SRAM_Adr allocate(SPU_IO::SampleRate frequency, size_t size) const;
+            void     deallocate()                                        const;
+
+            void set_sample_rate(SPU_IO::SampleRate frequency) const {
+                SPU_IO::Voice[Voice::get_id()].sampleRate.write(frequency);
+            }
+
+            void play() const {
+                SPU_IO::Key::On.write(1 << Voice::get_id());
+            }
+
+            void stop() const {
+                SPU_IO::Key::Off.write(1 << Voice::get_id());
+            }
+        };
+
+        extern const Voice voice[SPU_IO::VoiceCount];
     }
 }