add some functionality to the instruments by making their sound toggleable

Browse code add some functionality to the instruments by making their sound toggleable master
1 parent 844d787 commit 6e52a8e7753ee3fa891fc4888a42deeb507ea71a lukas authored on 5 Aug 2022

+#include "AudioHost.h"
+#include <android/log.h>
+#include <thread>
+#include <mutex>
+const uint32_t bufferSize = 2;
+static uint32_t sampleCount;
+static float *buffer;
+void renderInstrument(Instrument * instrument) {
+    instrument->render(buffer, sampleCount);
+}
+aaudio_data_callback_result_t dataCallback(
+        AAudioStream *stream,
+        void *userData,
+        void *audioData,
+        int32_t _sampleCount) {
+    sampleCount = _sampleCount;
+    buffer = static_cast<float*>(audioData);
+    for (uint32_t i = 0; i < _sampleCount; i++) {
+        buffer[i] = 0;
+    }
+    AudioHost *thiz = static_cast<AudioHost *>(userData);
+    std::for_each(thiz->instruments->begin(), thiz->instruments->end(), renderInstrument);
+    return AAUDIO_CALLBACK_RESULT_CONTINUE;
+}
+void errorCallback(AAudioStream *stream, void *data, aaudio_result_t error) {
+    __android_log_print(ANDROID_LOG_ERROR, "AudioHost", "an error occurred");
+}
+AudioHost::AudioHost() {
+    AAudioStreamBuilder *streamBuilder;
+    AAudio_createStreamBuilder(&streamBuilder);
+    AAudioStreamBuilder_setFormat(streamBuilder, AAUDIO_FORMAT_PCM_FLOAT);
+    AAudioStreamBuilder_setChannelCount(streamBuilder, 1);
+    AAudioStreamBuilder_setPerformanceMode(streamBuilder, AAUDIO_PERFORMANCE_MODE_LOW_LATENCY);
+    AAudioStreamBuilder_setDataCallback(streamBuilder, ::dataCallback, this);
+    AAudioStreamBuilder_setErrorCallback(streamBuilder, ::errorCallback, this);
+    aaudio_result_t result = AAudioStreamBuilder_openStream(streamBuilder, &stream);
+    if (result != AAUDIO_OK) {
+        __android_log_print(ANDROID_LOG_ERROR, "AudioHost", "Error opening stream %s",
+                            AAudio_convertResultToText(result));
+        return;
+    }
+    this->sampleRate = AAudioStream_getSampleRate(stream);
+    AAudioStream_setBufferSizeInFrames(
+            stream, AAudioStream_getFramesPerBurst(stream) * bufferSize);
+    result = AAudioStream_requestStart(stream);
+    if (result != AAUDIO_OK) {
+        __android_log_print(ANDROID_LOG_ERROR, "AudioHost", "Error starting stream %s",
+                            AAudio_convertResultToText(result));
+        return;
+    }
+    AAudioStreamBuilder_delete(streamBuilder);
+}