audio: Move tinyALSA-specific code to Module/StreamAlsa
Extract code interacting with tinyALSA which is not
specific to USB into "abstract" module and stream
implementations ModuleAlsa and StreamAlsa. Also, move
utility code which does not need module or stream
context into Utils.
This facilitates implementation of the CF core HAL which
also uses tinyALSA, allowing to share common code.
Bug: 264712385
Test: atest VtsHalAudioCoreTargetTest
Change-Id: I2134b15e970c78e8a48b254e15199b8207a8ab34
diff --git a/audio/aidl/default/alsa/Mixer.h b/audio/aidl/default/alsa/Mixer.h
new file mode 100644
index 0000000..de9e6f4
--- /dev/null
+++ b/audio/aidl/default/alsa/Mixer.h
@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2023 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.
+ */
+
+#pragma once
+
+#include <map>
+#include <memory>
+#include <mutex>
+#include <string>
+#include <vector>
+
+#include <android-base/thread_annotations.h>
+#include <android/binder_auto_utils.h>
+
+extern "C" {
+#include <tinyalsa/mixer.h>
+}
+
+namespace aidl::android::hardware::audio::core::alsa {
+
+class MixerControl {
+ public:
+ explicit MixerControl(struct mixer_ctl* ctl);
+
+ unsigned int getNumValues() const;
+ int getMaxValue() const;
+ int getMinValue() const;
+ int setArray(const void* array, size_t count);
+
+ private:
+ std::mutex mLock;
+ // The mixer_ctl object is owned by ALSA and will be released when the mixer is closed.
+ struct mixer_ctl* mCtl GUARDED_BY(mLock);
+ const unsigned int mNumValues;
+ const int mMinValue;
+ const int mMaxValue;
+};
+
+class Mixer {
+ public:
+ explicit Mixer(struct mixer* mixer);
+
+ ~Mixer();
+
+ bool isValid() const { return mMixer != nullptr; }
+
+ ndk::ScopedAStatus setMasterMute(bool muted);
+ ndk::ScopedAStatus setMasterVolume(float volume);
+ ndk::ScopedAStatus setVolumes(const std::vector<float>& volumes);
+
+ private:
+ enum Control {
+ MASTER_SWITCH,
+ MASTER_VOLUME,
+ HW_VOLUME,
+ };
+ using ControlNamesAndExpectedCtlType = std::pair<std::string, enum mixer_ctl_type>;
+ static const std::map<Control, std::vector<ControlNamesAndExpectedCtlType>> kPossibleControls;
+ static std::map<Control, std::shared_ptr<MixerControl>> initializeMixerControls(
+ struct mixer* mixer);
+
+ // The mixer object is owned by ALSA and will be released when the mixer is closed.
+ struct mixer* mMixer;
+ // `mMixerControls` will only be initialized in constructor. After that, it wil only be
+ // read but not be modified.
+ const std::map<Control, std::shared_ptr<MixerControl>> mMixerControls;
+};
+
+} // namespace aidl::android::hardware::audio::core::alsa