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libraries/audio-tools/examples/examples-communication/vban/player-sdmmc-vban/player-sdmmc-vban.ino

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+/**
+ * @file player-sdmmc-vban.ino
+ * @author Phil Schatzmann
+ * @brief decodes mp3 to vban: We need to use a queue to prevent delays to get too big.
+ * We try to keep the queue filled, so that we can always provide pcm data to vban 
+ */
+
+#include "AudioTools.h"
+#include "AudioTools/AudioCodecs/CodecMP3Helix.h"
+#include "AudioTools/Communication/VBANStream.h"
+#include "AudioTools/Disk/AudioSourceSDMMC.h" // or AudioSourceIdxSDMMC.h
+
+const char *startFilePath="/";
+const char* ext="mp3";
+const int mp3_pcm_size = 14000;
+AudioInfo info(44100,2,16);
+AudioSourceSDMMC source(startFilePath, ext);
+RingBuffer<uint8_t> ring_buffer(mp3_pcm_size*3);
+QueueStream<uint8_t> queue(ring_buffer);
+MP3DecoderHelix decoder;  // or change to MP3DecoderMAD
+AudioPlayer player(source, queue, decoder);
+
+VBANStream out;
+StreamCopy copier(out, queue, 2048); // 44100 needs 2048
+
+
+void fillQueue(){
+  // fill queue when smaller then limit
+  if(ring_buffer.availableForWrite() >= mp3_pcm_size){
+    player.copy();
+    // activate copy when limit is reached
+    if (!copier.isActive() && ring_buffer.available()>=23000){
+      copier.setActive(true);
+      LOGI("copier active");
+    }
+  }
+  LOGI("available: %d - avail to write: %d", ring_buffer.available(), ring_buffer.availableForWrite());
+}
+
+
+void setup() {
+  Serial.begin(115200);
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Warning);
+
+  // setup output
+  auto cfg = out.defaultConfig(TX_MODE);
+  cfg.copyFrom(info);
+  cfg.ssid = "ssid";
+  cfg.password = "password";
+  cfg.stream_name = "Stream1";
+  cfg.target_ip = IPAddress{192,168,1,37};
+  cfg.throttle_active = true;
+  //cfg.throttle_correction_us = 0;
+  if (!out.begin(cfg)) stop();
+
+  // setup player
+  player.setVolume(0.7);
+  player.begin();
+
+  // select file with setPath() or setIndex()
+  //player.setPath("/ZZ Top/Unknown Album/Lowrider.mp3");
+  //player.setIndex(1); // 2nd file
+
+  queue.begin(); // start queue
+  copier.setActive(false); // deactivate copy
+
+}
+
+void loop() {
+  fillQueue();
+  // output from queue
+  copier.copy();
+}