1 files changed, 82 insertions, 0 deletions
diff --git a/externals/oboe/samples/iolib/src/main/cpp/player/OneShotSampleSource.cpp b/externals/oboe/samples/iolib/src/main/cpp/player/OneShotSampleSource.cpp
new file mode 100644
index 0000000000..74fef60bd3
--- /dev/null
+++ b/externals/oboe/samples/iolib/src/main/cpp/player/OneShotSampleSource.cpp
@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2019 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 <string.h>
+
+#include "wav/WavStreamReader.h"
+
+#include "OneShotSampleSource.h"
+
+namespace iolib {
+
+void OneShotSampleSource::mixAudio(float* outBuff, int numChannels, int32_t numFrames) {
+    int32_t numSamples = mSampleBuffer->getNumSamples();
+    int32_t sampleChannels = mSampleBuffer->getProperties().channelCount;
+    int32_t totalSamplesNeeded = numFrames * numChannels; // Total samples to fill the output buffer
+    int32_t samplesProcessed = 0;
+    bool isLoopMode = mIsLoopMode;
+
+    while (samplesProcessed < totalSamplesNeeded && mIsPlaying) {
+        int32_t samplesLeft = numSamples - mCurSampleIndex;
+        int32_t framesLeft = (totalSamplesNeeded - samplesProcessed) / numChannels;
+        int32_t numWriteFrames = std::min(framesLeft, samplesLeft / sampleChannels);
+
+        if (numWriteFrames > 0) {
+            const float* data = mSampleBuffer->getSampleData();
+            if ((sampleChannels == 1) && (numChannels == 1)) {
+                // MONO output from MONO samples
+                for (int32_t frameIndex = 0; frameIndex < numWriteFrames; frameIndex++) {
+                    outBuff[samplesProcessed + frameIndex] += data[mCurSampleIndex++] * mGain;
+                }
+            } else if ((sampleChannels == 1) && (numChannels == 2)) {
+                // STEREO output from MONO samples
+                int dstSampleIndex = samplesProcessed;
+                for (int32_t frameIndex = 0; frameIndex < numWriteFrames; frameIndex++) {
+                    outBuff[dstSampleIndex++] += data[mCurSampleIndex] * mLeftGain;
+                    outBuff[dstSampleIndex++] += data[mCurSampleIndex++] * mRightGain;
+                }
+            } else if ((sampleChannels == 2) && (numChannels == 1)) {
+                // MONO output from STEREO samples
+                int dstSampleIndex = samplesProcessed;
+                for (int32_t frameIndex = 0; frameIndex < numWriteFrames; frameIndex++) {
+                    outBuff[dstSampleIndex++] += data[mCurSampleIndex++] * mLeftGain +
+                                                 data[mCurSampleIndex++] * mRightGain;
+                }
+            } else if ((sampleChannels == 2) && (numChannels == 2)) {
+                // STEREO output from STEREO samples
+                int dstSampleIndex = samplesProcessed;
+                for (int32_t frameIndex = 0; frameIndex < numWriteFrames; frameIndex++) {
+                    outBuff[dstSampleIndex++] += data[mCurSampleIndex++] * mLeftGain;
+                    outBuff[dstSampleIndex++] += data[mCurSampleIndex++] * mRightGain;
+                }
+            }
+
+            samplesProcessed += numWriteFrames * numChannels;
+
+            if (mCurSampleIndex >= numSamples) {
+                if (isLoopMode) {
+                    mCurSampleIndex = 0;
+                } else {
+                    mIsPlaying = false;
+                }
+            }
+        } else {
+            break; // No more samples to write in the current chunk
+        }
+    }
+}
+
+} // namespace wavlib