removed codecs to save memory

lib/ESP32-audioI2S/examples/Synchronised lyrics/synchronised_lyrics.ino

@@ -0,0 +1,96 @@
+#include "Arduino.h"
+#include "Audio.h"
+#include "SD_MMC.h"
+#include "Ticker.h"
+
+Audio audio;
+Ticker   ticker;
+char     *lyricsText;
+size_t   lyricsTextSize = 0;
+uint16_t lyricsPtr = 0;
+uint32_t timeStamp = 0;
+uint32_t ms = 0;
+char     chbuf[512];
+
+#define I2S_LRC     26
+#define I2S_DOUT    25
+#define I2S_BCLK    27
+#define I2S_MCLK     0
+
+#define SD_MMC_D0    2
+#define SD_MMC_CLK  14
+#define SD_MMC_CMD  15
+
+
+size_t bigEndian(char* base, uint8_t numBytes, uint8_t shiftLeft = 8){
+    uint64_t result = 0;
+    if(numBytes < 1 || numBytes > 8) return 0;
+    for (int i = 0; i < numBytes; i++) {
+            result += *(base + i) << (numBytes -i - 1) * shiftLeft;
+    }
+    if(result > SIZE_MAX) {log_e("range overflow"); result = 0;} // overflow
+    return (size_t)result;
+}
+
+void tckr(){ // caller every 100ms
+    if(audio.isRunning()){
+        ms += 100;
+        if(ms >= timeStamp){
+            Serial.print(chbuf);
+            strcpy(chbuf, lyricsText + lyricsPtr); lyricsPtr += strlen(chbuf) + 1; // strlen + '\0'
+            timeStamp = bigEndian(lyricsText + lyricsPtr, 4); lyricsPtr += 4;
+        }
+    }
+    else{
+        if(lyricsText) {free(lyricsText); lyricsText = NULL; lyricsTextSize = 0;}
+
+        ticker.detach();
+    }
+}
+
+void setup() {
+    pinMode(SD_MMC_D0, INPUT_PULLUP);
+    Serial.begin(115200);
+    if(!SD_MMC.begin( "/sdcard", true, false, 20000)){
+        Serial.println("Card Mount Failed");
+        return;
+    }
+    audio.setPinout(I2S_BCLK, I2S_LRC, I2S_DOUT);
+    audio.setVolume(10); // 0...21
+    audio.connecttoFS(SD_MMC, "/Little London Girl(lyrics).mp3");
+}
+
+void loop(){
+    vTaskDelay(1);
+    audio.loop();
+}
+
+// optional
+void audio_info(const char *info){
+    Serial.print("info        "); Serial.println(info);
+}
+void audio_id3data(const char *info){  //id3 metadata
+//    if(strncmp(info, "Year: ", 6) == 0) Serial.println(info + 6);
+    Serial.print("id3data     ");Serial.println(info);
+}
+void audio_eof_mp3(const char *info){  //end of file
+    Serial.print("eof_mp3     ");Serial.println(info);
+}
+
+void audio_id3lyrics(File &file, const size_t pos, const size_t size) {
+    Serial.printf("\naudio_id3lyrics, pos: %d, size: %d\n", pos, size);
+    lyricsText = (char *)malloc(size);
+    lyricsTextSize = size;
+    file.seek(pos);
+    file.read((uint8_t *)lyricsText, size);
+    Serial.printf("text encoding: %i\n", lyricsText[0]); // 0: ASCII, 3: UTF-8
+    char lang[14]; memcpy(lang, (const char*)lyricsText + 1, 3); lang[3] = '\0'; Serial.printf("language: %s\n", lang);
+    Serial.printf("time stamp format: %i\n", lyricsText[4]);
+    Serial.printf("content type: %i\n", lyricsText[5]);
+    Serial.printf("content descriptor: %i\n\n", lyricsText[6]);
+    lyricsPtr = 7;
+    strcpy(chbuf, lyricsText + lyricsPtr); lyricsPtr += strlen(chbuf) + 1; // strlen + '\0'
+    timeStamp = bigEndian(lyricsText + lyricsPtr, 4);
+    ticker.attach(0.1, tckr); lyricsPtr += 4;
+}
+