aaudio: add simple flowgraph system
Implement a simple data flow model that can be used to
chain various processing modules including:
data format conversion
volume ramping
channel conversion
Bug: 65067568
Test: test_flowgraph.cpp
Change-Id: I81a5655406cfa8c1c7d7cef4d933879f823939a5
diff --git a/media/libaaudio/src/flowgraph/SinkI16.cpp b/media/libaaudio/src/flowgraph/SinkI16.cpp
new file mode 100644
index 0000000..ffec8f5
--- /dev/null
+++ b/media/libaaudio/src/flowgraph/SinkI16.cpp
@@ -0,0 +1,58 @@
+/*
+ * Copyright 2018 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 <algorithm>
+#include <unistd.h>
+
+#ifdef __ANDROID__
+#include <audio_utils/primitives.h>
+#endif
+
+#include "AudioProcessorBase.h"
+#include "SinkI16.h"
+
+using namespace flowgraph;
+
+SinkI16::SinkI16(int32_t channelCount)
+ : AudioSink(channelCount) {}
+
+int32_t SinkI16::read(void *data, int32_t numFrames) {
+ int16_t *shortData = (int16_t *) data;
+ const int32_t channelCount = input.getSamplesPerFrame();
+
+ int32_t framesLeft = numFrames;
+ while (framesLeft > 0) {
+ // Run the graph and pull data through the input port.
+ int32_t framesRead = pull(framesLeft);
+ if (framesRead <= 0) {
+ break;
+ }
+ const float *signal = input.getBlock();
+ int32_t numSamples = framesRead * channelCount;
+#ifdef __ANDROID__
+ memcpy_to_i16_from_float(shortData, signal, numSamples);
+ shortData += numSamples;
+ signal += numSamples;
+#else
+ for (int i = 0; i < numSamples; i++) {
+ int32_t n = (int32_t) (*signal++ * 32768.0f);
+ *shortData++ = std::min(INT16_MAX, std::max(INT16_MIN, n)); // clip
+ }
+#endif
+ framesLeft -= framesRead;
+ }
+ return numFrames - framesLeft;
+}