changes: * prevent clic-noise in beginning of playback

           ! issue bug report upstream
             * first playback after init of class (call of constructor)
             * may be similar like earlephilhower/ESP8266Audio#406
           ! may be check whether this is hardware dependend; may be just internal speaker affected and line out of RCA module not
           ! may be check wheteher use mic at same time as playback, could avoid i2s re-config and thus clic-noise
             * see schreibfaul1/ESP32-audioI2S#604
             * problem is there is i2s config we don't have control of
           ! may be use i2s_write(...) with a zero buffer instead of connect, loop and stop playing
         * prevent clic-noise in beginning of recorded file by skipping some data

README.md

@@ -38,5 +38,6 @@ The simple GUI is specifically designed for children, who are able to choose a s
 ## Credit
 This project uses the [M5Core2](https://github.com/m5stack/M5Core2) library to access peripherals and [ESP32-audioI2S](https://github.com/schreibfaul1/ESP32-audioI2S) for high quality audio replay.
 The beautiful [Giraffe](https://publicdomainvectors.org/en/free-clipart/Cartoon-giraffe-image/49785.html) logo is taken from publicdomainvectors.org. The buttons are based on the [Tabler](https://github.com/tabler/tabler-icons) icon set. 
+Text-to-speech synthesis using [ttsfree.com](https://ttsfree.com/text-to-speech/german).
 
 

notes.txt

@@ -194,8 +194,7 @@ changes: * improve handling of empty playlists/folders
              * https://forum.arduino.cc/t/runtime-remove-and-insert-a-sd-card/313386
              * https://github.com/greiman/SdFat
 
-
-(--- new v12 ---)
+--- new v12 ---
 changes: * add gain by bit shifting for recorded data (4x)
            ! suppress initial click by ommitting first few millisecs or everything until amplitude below given threshold
          * voice messsage during startup if battery level is low
@@ -208,24 +207,28 @@ changes: * add gain by bit shifting for recorded data (4x)
            ! may be add beeps by using sequence (see rec_play); pause, i2s_write(sin(...)), resume (do not change i2s config)
            ! may be colorize battery icons (low; red / ok; green / may be intermediate; yellow/orange)
            ! may be add battery level message to startNextSong(), startPrevSong() before playback (how to loop()?)
+         * prevent clic-noise in beginning of playback
+           ! issue bug report upstream
+             * first playback after init of class (call of constructor)
+             * may be similar like https://github.com/earlephilhower/ESP8266Audio/issues/406
+           ! may be check whether this is hardware dependend; may be just internal speaker affected and line out of RCA module not
+           ! may be check wheteher use mic at same time as playback, could avoid i2s re-config and thus clic-noise
+             * see https://github.com/schreibfaul1/ESP32-audioI2S/discussions/604
+             * problem is there is i2s config we don't have control of
+           ! may be use i2s_write(...) with a zero buffer instead of connect, loop and stop playing
+         * prevent clic-noise in beginning of recorded file by skipping some data
 
 
 (--- new v13 ---)
 
 
-problem: knacken bei replay des ersten titels nach i2s driver install...?
--> immer erstes playback nach 'new Audio()'
--> 'updateVolume' nach 'initializeHardware' macht es schlimmer...?
--> https://github.com/earlephilhower/ESP8266Audio/issues/406
--> volume auf 0, dann wieder auf vorherigen wert setzen während start von playback...?
-
-use mic at same time as playback, could also avoid i2s re-config and thus "knacken" (siehe oben)
--> https://github.com/schreibfaul1/ESP32-audioI2S/discussions/604
+ev. record und sleep-mode buttons tauschen?!
 
 
 versuchen espuino auf m5core2 zu portieren und dann dieses GUI inkl. nachtlicht zu mergen
 
 send to bluetooth speaker (sink) - is it also possible to send to multiple, say 2, 3, ... (more?) - also add simple menu for pairing
+how to get (raw) data from esp32-audioi2s?
 
 build 3D case to print (incl. speaker)
 

src/player.cpp

@@ -106,6 +106,12 @@ void CPlayer::initializeHardware()
     // RCA Module 13.2 (can be used at same time)
     m_audio->setPinout(19, 0, 2);  // I2S_BCLK, I2S_LRC, I2S_DOUT
 #endif
+    // prevent clic-noise when setting volume after init of audio lib (work-a-round)
+    m_audio->setVolume(0);
+    m_audio->connecttoFS(SPIFFS, "audio-battery.mp3");  // any file available can be used
+    for (uint8_t i = 0; i < 100; ++i)  // 50 iterations should be enough, take x2
+        m_audio->loop();
+    m_audio->stopSong();
     m_audio->setVolume(m_currentVolume);
 
     vibrate();
@@ -429,9 +435,7 @@ void CPlayer::handleTouchEvents()
                 vibrate();
                 m_songFiles.push_back(rec_name);
                 m_activeSongIdx[m_activeSongIdxIdx] = m_songFiles.size() - 2;
-//                m_audio->setVolume(0);
                 startNextSong();
-//                m_audio->setVolume(m_currentVolume);
             }
         }
         else if ((105 <= touchPoint.x) && (touchPoint.x <= 205))  // BtnB
@@ -746,15 +750,19 @@ void CPlayer::rec_record(const char *filepath) {  // see https://github.com/m5st
 
     uint16_t microphonedata0[DATA_SIZE/2 * 1];  // DATA_SIZE = 1024 (must be multiple of 2 as data actually is 16 bit!)
     int data_offset = 0;
+    size_t byte_read;
 
 	File file = SD.open(filepath, FILE_WRITE);
     file.seek(44);  // before 44 is the header that gets written in the end
 
     M5.Spk.InitI2SSpeakOrMic(MODE_MIC);  // install mic i2s driver
 
+    // supress clic-noise in recorded file, by skipping some data (1 buffer)
+    i2s_read(Speak_I2S_NUMBER, (char *)(microphonedata0),
+             DATA_SIZE, &byte_read, (100 / portTICK_RATE_MS));
+
     M5.Lcd.fillCircle(280, 80, 10, TFT_RED);
 
-    size_t byte_read;
     while (1) {
         i2s_read(Speak_I2S_NUMBER, (char *)(microphonedata0),
                  DATA_SIZE, &byte_read, (100 / portTICK_RATE_MS));
@@ -777,7 +785,6 @@ void CPlayer::rec_record(const char *filepath) {  // see https://github.com/m5st
 // ALTERNATIVE: RESTART AND PLAY LAST SONG BY STORING ITS INDEX IN CONFIGURATION !!!
 // ACHTUNG MACHT EV. PROBLEME - EINZELNE BEFEHLE HERAUSNEHMEN...?!
     initializeHardware();
-//    updateVolume(0);
 
     M5.Lcd.fillCircle(280, 80, 10, TFT_BLACK);
 }