59 lines
1.5 KiB
C++
59 lines
1.5 KiB
C++
/**
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* @file test-mp3-shine.ino
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* @author Phi Schatzmann
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* @brief This sktch is used to test the MP3 encoder using the shine library. It
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* generates a sine wave and encodes it to MP3 format. We measure the encoding
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* speed and print the frames per second to the serial monitor.
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* @version 0.1
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* @date 2026-06-20
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*
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* @copyright Copyright (c) 2026
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*
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*/
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#include "AudioTools.h"
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#include "AudioTools/AudioCodecs/CodecMP3Shine.h"
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AudioInfo info(44100, 2, 16);
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SineGenerator<int16_t> sineWave(32000);
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GeneratedSoundStream<int16_t> sound(sineWave);
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NullStream null_stream;
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MP3EncoderShine shine;
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EncodedAudioStream out(&null_stream, &shine);
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StreamCopy copier(out, sound); // copies sound into i2s
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int frames = 0;
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size_t total_frames = 0;
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size_t total_time_ms = 0;
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size_t counter = 0;
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void setup() {
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Serial.begin(115200);
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while(!Serial);
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Serial.println("starting...");
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sineWave.setFrequency(440); // Set frequency to 440 Hz (A4 note)
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sound.begin(info);
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if (!out.begin(info)) {
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Serial.println("Failed to start MP3 encoder");
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stop();
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}
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frames =
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copier.bufferSize() / (info.channels * (info.bits_per_sample / 8));
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// print memory
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checkMemory(true);
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}
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void loop() {
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unsigned long start = millis();
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copier.copy();
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unsigned long end = millis();
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total_time_ms += (end - start);
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total_frames += frames;
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if (counter++ >= 1000) {
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Serial.print("Frames per second: ");
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Serial.println((float)total_frames / (float)total_time_ms * 1000.0);
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counter = 0;
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}
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}
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