neotools: adpcm-a partial rewrite

neotools/adpcm.h

@@ -0,0 +1,14 @@
+#ifndef ADPCM_H
+#define ADPCM_H
+
+typedef struct AdpcmADecoderState
+{
+	int jediTable[49 * 16];
+	int cursignal;
+	int delta;
+} AdpcmADecoderState;
+
+void adpcmAInit(AdpcmADecoderState* decoder);
+void adpcmADecode(AdpcmADecoderState* restrict decoder, char* restrict in, short* restrict out, int len);
+
+#endif//ADPCM_H