audio: Add example HAL implementation

This is partial implementation of the example V7.0 audio HAL
which passes VTS tests. Note that the 'core' part
of the HAL (IDevice/IStream) isn't implemented yet.
It passes VTS because it doesn't provide any devices
(modules) and the audio HAL isn't the 'default' instance.

Bug: 142480271
Test: atest VtsHalAudioV7_0TargetTest
      atest VtsHalAudioEffectV7_0TargetTest
Change-Id: Ie3dd62c5db1cdb5534df4dd7f326c4c8776bf3c4

1 files changed, 130 insertions, 0 deletions

diff --git a/audio/common/7.0/example/EqualizerEffect.cpp b/audio/common/7.0/example/EqualizerEffect.cpp
new file mode 100644
index 0000000000..c93c5a90fb
--- /dev/null
+++ b/audio/common/7.0/example/EqualizerEffect.cpp
@@ -0,0 +1,130 @@
+/*
+ * Copyright (C) 2020 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 <limits>
+
+#define LOG_TAG "EffectsFactory7.0"
+#include <log/log.h>
+
+#include "EqualizerEffect.h"
+
+using ::android::hardware::hidl_string;
+using ::android::hardware::hidl_vec;
+using ::android::hardware::Return;
+using ::android::hardware::Void;
+using namespace ::android::hardware::audio::common::V7_0;
+
+namespace android::hardware::audio::effect::V7_0::implementation {
+
+const EffectDescriptor& EqualizerEffect::getDescriptor() {
+    // Note: for VTS tests only 'type' and 'uuid' fields are required.
+    // The actual implementation must provide meaningful values
+    // for all fields of the descriptor.
+    static const EffectDescriptor descriptor = {
+            .type =
+                    {// Same UUID as AudioEffect.EFFECT_TYPE_EQUALIZER in Java.
+                     0x0bed4300, 0xddd6, 0x11db, 0x8f34,
+                     std::array<uint8_t, 6>{{0x00, 0x02, 0xa5, 0xd5, 0xc5, 0x1b}}},
+            .uuid = {0, 0, 0, 1, std::array<uint8_t, 6>{{0, 0, 0, 0, 0, 0}}}};
+    return descriptor;
+}
+
+EqualizerEffect::EqualizerEffect() : mEffect(new Effect(getDescriptor())) {
+    mProperties.bandLevels.resize(kNumBands);
+}
+
+Return<void> EqualizerEffect::getNumBands(getNumBands_cb _hidl_cb) {
+    _hidl_cb(Result::OK, kNumBands);
+    return Void();
+}
+
+Return<void> EqualizerEffect::getLevelRange(getLevelRange_cb _hidl_cb) {
+    _hidl_cb(Result::OK, std::numeric_limits<int16_t>::min(), std::numeric_limits<int16_t>::max());
+    return Void();
+}
+
+Return<Result> EqualizerEffect::setBandLevel(uint16_t band, int16_t level) {
+    if (band < kNumBands) {
+        mProperties.bandLevels[band] = level;
+        return Result::OK;
+    } else {
+        return Result::INVALID_ARGUMENTS;
+    }
+}
+
+Return<void> EqualizerEffect::getBandLevel(uint16_t band, getBandLevel_cb _hidl_cb) {
+    if (band < kNumBands) {
+        _hidl_cb(Result::OK, mProperties.bandLevels[band]);
+    } else {
+        _hidl_cb(Result::INVALID_ARGUMENTS, 0);
+    }
+    return Void();
+}
+
+Return<void> EqualizerEffect::getBandCenterFrequency(uint16_t band,
+                                                     getBandCenterFrequency_cb _hidl_cb) {
+    (void)band;
+    _hidl_cb(Result::OK, 0);
+    return Void();
+}
+
+Return<void> EqualizerEffect::getBandFrequencyRange(uint16_t band,
+                                                    getBandFrequencyRange_cb _hidl_cb) {
+    (void)band;
+    _hidl_cb(Result::OK, 0, 1);
+    return Void();
+}
+
+Return<void> EqualizerEffect::getBandForFrequency(uint32_t freq, getBandForFrequency_cb _hidl_cb) {
+    (void)freq;
+    _hidl_cb(Result::OK, 0);
+    return Void();
+}
+
+Return<void> EqualizerEffect::getPresetNames(getPresetNames_cb _hidl_cb) {
+    hidl_vec<hidl_string> presetNames;
+    presetNames.resize(kNumPresets);
+    presetNames[0] = "default";
+    _hidl_cb(Result::OK, presetNames);
+    return Void();
+}
+
+Return<Result> EqualizerEffect::setCurrentPreset(uint16_t preset) {
+    if (preset < kNumPresets) {
+        mProperties.curPreset = preset;
+        return Result::OK;
+    } else {
+        return Result::INVALID_ARGUMENTS;
+    }
+}
+
+Return<void> EqualizerEffect::getCurrentPreset(getCurrentPreset_cb _hidl_cb) {
+    _hidl_cb(Result::OK, mProperties.curPreset);
+    return Void();
+}
+
+Return<Result> EqualizerEffect::setAllProperties(
+        const IEqualizerEffect::AllProperties& properties) {
+    mProperties = properties;
+    return Result::OK;
+}
+
+Return<void> EqualizerEffect::getAllProperties(getAllProperties_cb _hidl_cb) {
+    _hidl_cb(Result::OK, mProperties);
+    return Void();
+}
+
+}  // namespace android::hardware::audio::effect::V7_0::implementation