snapshot

libraries/audio-tools/tests-cmake/codec/opus/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.20)
+
+# set the project name
+project(opus)
+set (CMAKE_CXX_STANDARD 11)
+set (DCMAKE_CXX_FLAGS "-Werror")
+
+include(FetchContent)
+
+# Build with arduino-audio-tools
+if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
+    add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/../../.. ${CMAKE_CURRENT_BINARY_DIR}/arduino-audio-tools )
+endif()
+
+# Build with libopus 
+FetchContent_Declare(arduino_libopus GIT_REPOSITORY "https://github.com/pschatzmann/codec-opus.git" GIT_TAG main )
+FetchContent_GetProperties(arduino_libopus)
+if(NOT arduino_libopus_POPULATED)
+    FetchContent_Populate(arduino_libopus)
+    add_subdirectory(${arduino_libopus_SOURCE_DIR} ${CMAKE_CURRENT_BINARY_DIR}/arduino_libopus)
+endif()
+
+# build sketch as executable
+add_executable (opus opus.cpp)
+# set preprocessor defines
+target_compile_definitions(opus PUBLIC -DARDUINO  -DUSE_PORTAUDIO -DIS_DESKTOP )
+
+# specify libraries
+target_link_libraries(opus portaudio arduino_emulator arduino_libopus arduino-audio-tools )
+# ESP32: CONFIG_ARDUINO_LOOP_STACK_SIZE 8192 -> so we test it with this setting "-Wl,-z,stack-size=8192"
+# add_link_options("-z,stack-size=8192")
+

libraries/audio-tools/tests-cmake/codec/opus/opus.cpp

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+/**
+ * @file test-codec-opus.ino
+ * @author Phil Schatzmann
+ * @brief generate sine wave -> encoder -> decoder -> audiokit (i2s)
+ * @version 0.1
+ * @date 2022-04-30
+ * 
+ * @copyright Copyright (c) 2022
+ * 
+ */
+#include "AudioTools.h"
+#include "AudioTools/AudioCodecs/CodecOpus.h"
+
+int sample_rate = 24000;
+int channels = 1;  // The stream will have 2 channels
+
+SineWaveGenerator<int16_t> sineWave( 32000);  // subclass of SoundGenerator with max amplitude of 32000
+GeneratedSoundStream<int16_t> sound( sineWave); // Stream generated from sine wave
+CsvOutput<int16_t> out(Serial, 2);   // Output of sound on desktop 
+OpusAudioEncoder enc;
+OpusAudioDecoder dec;
+EncodedAudioStream decoder(&out, &dec); // encode and write 
+EncodedAudioStream encoder(&decoder, &enc); // encode and write 
+StreamCopy copier(encoder, sound);     
+
+void setup() {
+  Serial.begin(115200);
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Debug);
+
+
+  // Setup sine wave
+  auto cfgs = sineWave.defaultConfig();
+  cfgs.sample_rate = sample_rate;
+  cfgs.channels = channels;
+  cfgs.bits_per_sample = 16;
+  sineWave.begin(cfgs, N_B4);
+
+  // Opus decoder needs to know the audio info
+  decoder.begin(cfgs);
+
+  // configure and start encoder
+  enc.config().application = OPUS_APPLICATION_AUDIO;
+  encoder.begin(cfgs);
+
+  Serial.println("Test started...");
+}
+
+
+void loop() { 
+  copier.copy();
+}