libaaudio: implement callback
Use AudioTrack and AudioRecord TRANSFER_CALLBACK.
Add FixedBlockAdapter to provide fixed size callbacks.
Bug: 36489240
Test: CTS test_aaudio.cpp
Change-Id: Id2034dd640f878dd27fee6b43ad80a01c627dfd6
Signed-off-by: Phil Burk <philburk@google.com>
diff --git a/media/libaaudio/src/utility/FixedBlockWriter.h b/media/libaaudio/src/utility/FixedBlockWriter.h
new file mode 100644
index 0000000..f1d917c
--- /dev/null
+++ b/media/libaaudio/src/utility/FixedBlockWriter.h
@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2017 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.
+ */
+
+#ifndef AAUDIO_FIXED_BLOCK_WRITER_H
+#define AAUDIO_FIXED_BLOCK_WRITER_H
+
+#include <stdint.h>
+
+#include "FixedBlockAdapter.h"
+
+/**
+ * This can be used to convert a push data flow from variable sized buffers to fixed sized buffers.
+ * An example would be an audio input callback.
+ */
+class FixedBlockWriter : public FixedBlockAdapter
+{
+public:
+ FixedBlockWriter(FixedBlockProcessor &fixedBlockProcessor);
+
+ virtual ~FixedBlockWriter() = default;
+
+ int32_t writeToStorage(uint8_t *buffer, int32_t numBytes);
+
+ /**
+ * Write from a variable sized block.
+ */
+ int32_t processVariableBlock(uint8_t *buffer, int32_t numBytes) override;
+};
+
+#endif /* AAUDIO_FIXED_BLOCK_WRITER_H */