snapshot

libraries/audio-tools/tests-cmake/codec/mp3-parser/mp3-parser.cpp

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+/// Testing the MP3ParserEncoder: the mp3 data must start with a sync word
+
+#include <assert.h>
+
+#include "AudioTools.h"
+#include "AudioTools/AudioCodecs/MP3Parser.h"
+#include "AudioTools/AudioLibs/Desktop/File.h"
+
+MP3ParserEncoder enc;  // mp3 packaging
+MetaDataFilterEncoder filter(enc);
+CallbackStream cb;
+EncodedAudioOutput out_stream(&cb, &filter);
+File file;
+StreamCopy copier(out_stream, file);
+
+void setup() {
+  Serial.begin(115200);
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Info);
+
+  file = SD.open("/home/pschatzmann/Music/test.mp3", FILE_READ);
+  out_stream.begin();
+
+  auto write_cb = [](const uint8_t* data, size_t size) {
+    // Ensure each emitted chunk starts with an MP3 sync word (0xFFE?)
+    if (size >= 2) {
+      assert(data[0] == 0xFF && (data[1] & 0xE0) == 0xE0);
+    }
+    char msg[120];
+    snprintf(msg, 120,
+             "write: %d, sample_rate: %d, samples: %d, duration: %u us",
+             (int)size, (int)enc.audioInfo().sample_rate, enc.samplesPerFrame(),
+             (unsigned)enc.frameDurationUs());
+    Serial.println(msg);
+    return size;
+  };
+  cb.setWriteCallback(write_cb);
+  cb.begin();
+}
+
+void loop() {
+  if (!copier.copy()) {
+    out_stream.end();
+    exit(0);
+  }
+}