添加一些关于midi播放的项目

Midi/music-box-pc-master/WaveTableSynthesizer/Player.c

@@ -0,0 +1,84 @@
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+#include "SynthCore.h"
+#include "Player.h"
+
+#define LOGD
+
+extern unsigned char Score[];
+
+void Player32kProc(volatile Player *player) {
+    Synth(&(player->mainSynthesizer));
+    player->currentTick++;
+    if (player->decayGenTick < 150)
+        player->decayGenTick += 1;
+}
+
+void PlayerProcess(volatile Player *player) {
+
+    uint8_t temp;
+    //LOGD("PlayerProcess\n");
+    if (player->decayGenTick >= 150) {
+        //LOGD("GenDecayEnvlope\n");
+        GenDecayEnvlope(&(player->mainSynthesizer));
+        player->decayGenTick = 0;
+    }
+    if (player->status == STATUS_PLAYING)
+    {
+        if ((player->currentTick >> 8) >= player->lastScoreTick)
+        {
+            do
+            {
+                temp = *(player->scorePointer);
+                player->scorePointer++;
+                if (temp == 0xFF)
+                {
+                    player->status = STATUS_STOP;
+                }
+                else
+                {
+                    LOGD("Note On:%d\n",temp);
+                    NoteOn(&(player->mainSynthesizer), temp);
+                }
+            } while ((temp & 0x80) == 0);
+            
+            PlayUpdateNextScoreTick(player);
+        }
+    }
+    //LOGD("PlayerProcessWEnd\n");
+}
+
+void PlayUpdateNextScoreTick(volatile Player *player) {
+    uint32_t tempU32;
+    uint8_t temp;
+    tempU32 = player->lastScoreTick;
+    do {
+        temp = *(player->scorePointer);
+        player->scorePointer++;
+        tempU32 += temp;
+    } while (temp == 0xFF);
+    player->lastScoreTick = tempU32;
+}
+
+void PlayerPlay(volatile Player *player) {
+    player->currentTick = 0;
+    player->lastScoreTick = 0;
+    player->decayGenTick = 0;
+    player->scorePointer = Score;
+    PlayUpdateNextScoreTick(player);
+    player->status = STATUS_PLAYING;
+}
+
+void PlayerInit(volatile Player *player) {
+    player->status = STATUS_STOP;
+    player->currentTick = 0;
+    player->lastScoreTick = 0;
+    player->decayGenTick = 0;
+    player->scorePointer = Score;
+    SynthInit(&(player->mainSynthesizer));
+}
+
+void PlayerResetSynthesizer(volatile Player *player) {
+    SynthInit(&(player->mainSynthesizer));
+}