1 files changed, 69 insertions, 0 deletions
diff --git a/externals/oboe/apps/OboeTester/app/src/main/cpp/SawPingGenerator.cpp b/externals/oboe/apps/OboeTester/app/src/main/cpp/SawPingGenerator.cpp
new file mode 100644
index 0000000000..3220df226b
--- /dev/null
+++ b/externals/oboe/apps/OboeTester/app/src/main/cpp/SawPingGenerator.cpp
@@ -0,0 +1,69 @@
+/*
+ * Copyright 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <unistd.h>
+#include "common/OboeDebug.h"
+#include "oboe/Definitions.h"
+#include "SawPingGenerator.h"
+
+using namespace oboe::flowgraph;
+
+SawPingGenerator::SawPingGenerator()
+        : OscillatorBase()
+        , mRequestCount(0)
+        , mAcknowledgeCount(0)
+        , mLevel(0.0f) {
+}
+
+SawPingGenerator::~SawPingGenerator() { }
+
+void SawPingGenerator::reset() {
+    FlowGraphNode::reset();
+    mAcknowledgeCount.store(mRequestCount.load());
+}
+
+int32_t SawPingGenerator::onProcess(int numFrames) {
+
+    const float *frequencies = frequency.getBuffer();
+    const float *amplitudes = amplitude.getBuffer();
+    float *buffer = output.getBuffer();
+
+    if (mRequestCount.load() > mAcknowledgeCount.load()) {
+        mPhase = -1.0f;
+        mLevel = 1.0;
+        mAcknowledgeCount++;
+    }
+
+    // Check level to prevent numeric underflow.
+    if (mLevel > 0.000001) {
+        for (int i = 0; i < numFrames; i++) {
+            float sawtooth = incrementPhase(frequencies[i]);
+            *buffer++ = (float) (sawtooth * mLevel * amplitudes[i]);
+            mLevel *= 0.999;
+        }
+    } else {
+        for (int i = 0; i < numFrames; i++) {
+            *buffer++ = 0.0f;
+        }
+    }
+
+    return numFrames;
+}
+
+void SawPingGenerator::trigger() {
+    mRequestCount++;
+}
+