snapshot

libraries/audio-tools/tests-cmake/fft/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.20)
+
+
+# set the project name
+project(fft)
+set (CMAKE_CXX_STANDARD 11)
+set (DCMAKE_CXX_FLAGS "-Werror")
+set (CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -O0 -ldl -lpthread -lm")
+set (CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -O0 -ldl -lpthread -lm")
+
+# Emulator is not necessary for -DIS_MIN_DESKTOP
+set(ADD_ARDUINO_EMULATOR OFF CACHE BOOL "Add Arduino Emulator Library") 
+set(ADD_PORTAUDIO OFF CACHE BOOL "No Portaudio") 
+
+# Build with arduino-audio-tools
+if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
+    add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/../.. ${CMAKE_CURRENT_BINARY_DIR}/arduino-audio-tools )
+endif()
+
+# Download miniaudio.h
+file(DOWNLOAD https://raw.githubusercontent.com/mackron/miniaudio/master/miniaudio.h
+    ${CMAKE_CURRENT_SOURCE_DIR}/miniaudio.h)
+
+
+# build sketch as executable
+add_executable (fft fft.cpp)
+
+# set preprocessor defines
+target_compile_definitions(fft PUBLIC -DIS_MIN_DESKTOP)
+
+# specify libraries
+target_link_libraries(fft arduino-audio-tools)
+
+# access to miniaudio in sketch directory
+target_include_directories(fft PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})

libraries/audio-tools/tests-cmake/fft/fft.cpp

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+#include "AudioTools.h"
+#include "AudioTools/AudioLibs/AudioRealFFT.h" // using RealFFT
+#include "AudioTools/AudioLibs/MiniAudioStream.h"
+
+AudioInfo info(44100, 2, 16);
+AudioRealFFT afft; // or AudioKissFFT
+Hann hann;
+BufferedWindow buffered(&hann);
+SineWaveGenerator<int16_t> sineWave(32000);
+GeneratedSoundStream<int16_t> in(sineWave);
+StreamCopy copier(afft, in);
+//CsvOutput<int16_t> out(Serial);
+MiniAudioStream out;
+StreamCopy copierIFFT(out, afft);
+
+// process fft result
+void fftResult(AudioFFTBase &fft) {
+  // copy ifft result to output
+  while (copierIFFT.copy());
+}
+
+void setup() {
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Warning);
+
+  // set the frequency
+  sineWave.setFrequency(N_B4);
+
+  // Setup sine wave
+  auto cfg = in.defaultConfig();
+  cfg.copyFrom(info);
+  in.begin(cfg);
+
+  // Setup FFT
+  auto tcfg = afft.defaultConfig(RXTX_MODE);
+  tcfg.copyFrom(info);
+  tcfg.length = 1024;
+  tcfg.window_function = &buffered;
+  tcfg.stride = 512;
+  tcfg.callback = fftResult;
+  afft.begin(tcfg);
+
+  // setup output
+  auto ocfg = out.defaultConfig(TX_MODE);
+  ocfg.copyFrom(info);
+  out.begin(ocfg);
+}
+
+void loop() { copier.copy(); }