Add function for scaling haptic data.
The function was in AudioMixer. With adding haptic-generating effect,
there will be more than one place calling the scaling function. In that
case, it makes more sense to put the scaling function in vibrator
library.
Bug: 136490803
Test: play audio-coupled-haptic files
Test: play audio with attaching haptic-generating effect
Change-Id: Ia7f88463e2d2b7f11954ab9bb6aeff8191c78894
diff --git a/libs/vibrator/Android.bp b/libs/vibrator/Android.bp
index e95a080..1681fe2 100644
--- a/libs/vibrator/Android.bp
+++ b/libs/vibrator/Android.bp
@@ -14,6 +14,8 @@
cc_library_shared {
name: "libvibrator",
+ vendor_available: true,
+ double_loadable: true,
shared_libs: [
"libbinder",
diff --git a/libs/vibrator/ExternalVibrationUtils.cpp b/libs/vibrator/ExternalVibrationUtils.cpp
new file mode 100644
index 0000000..749c568
--- /dev/null
+++ b/libs/vibrator/ExternalVibrationUtils.cpp
@@ -0,0 +1,91 @@
+/*
+ * 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 <cstring>
+
+#include <math.h>
+
+#include <vibrator/ExternalVibrationUtils.h>
+
+namespace android::os {
+
+namespace {
+static constexpr float HAPTIC_SCALE_VERY_LOW_RATIO = 2.0f / 3.0f;
+static constexpr float HAPTIC_SCALE_LOW_RATIO = 3.0f / 4.0f;
+static constexpr float HAPTIC_MAX_AMPLITUDE_FLOAT = 1.0f;
+
+float getHapticScaleGamma(HapticScale scale) {
+ switch (scale) {
+ case HapticScale::VERY_LOW:
+ return 2.0f;
+ case HapticScale::LOW:
+ return 1.5f;
+ case HapticScale::HIGH:
+ return 0.5f;
+ case HapticScale::VERY_HIGH:
+ return 0.25f;
+ default:
+ return 1.0f;
+ }
+}
+
+float getHapticMaxAmplitudeRatio(HapticScale scale) {
+ switch (scale) {
+ case HapticScale::VERY_LOW:
+ return HAPTIC_SCALE_VERY_LOW_RATIO;
+ case HapticScale::LOW:
+ return HAPTIC_SCALE_LOW_RATIO;
+ case HapticScale::NONE:
+ case HapticScale::HIGH:
+ case HapticScale::VERY_HIGH:
+ return 1.0f;
+ default:
+ return 0.0f;
+ }
+}
+
+} // namespace
+
+bool isValidHapticScale(HapticScale scale) {
+ switch (scale) {
+ case HapticScale::MUTE:
+ case HapticScale::VERY_LOW:
+ case HapticScale::LOW:
+ case HapticScale::NONE:
+ case HapticScale::HIGH:
+ case HapticScale::VERY_HIGH:
+ return true;
+ }
+ return false;
+}
+
+void scaleHapticData(float* buffer, size_t length, HapticScale scale) {
+ if (!isValidHapticScale(scale) || scale == HapticScale::NONE) {
+ return;
+ }
+ if (scale == HapticScale::MUTE) {
+ memset(buffer, 0, length * sizeof(float));
+ return;
+ }
+ float gamma = getHapticScaleGamma(scale);
+ float maxAmplitudeRatio = getHapticMaxAmplitudeRatio(scale);
+ for (size_t i = 0; i < length; i++) {
+ float sign = buffer[i] >= 0 ? 1.0 : -1.0;
+ buffer[i] = powf(fabsf(buffer[i] / HAPTIC_MAX_AMPLITUDE_FLOAT), gamma)
+ * maxAmplitudeRatio * HAPTIC_MAX_AMPLITUDE_FLOAT * sign;
+ }
+}
+
+} // namespace android::os
diff --git a/libs/vibrator/include/vibrator/ExternalVibrationUtils.h b/libs/vibrator/include/vibrator/ExternalVibrationUtils.h
new file mode 100644
index 0000000..20045d0
--- /dev/null
+++ b/libs/vibrator/include/vibrator/ExternalVibrationUtils.h
@@ -0,0 +1,39 @@
+/*
+ * 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.
+ */
+
+#ifndef ANDROID_EXTERNAL_VIBRATION_UTILS_H
+#define ANDROID_EXTERNAL_VIBRATION_UTILS_H
+
+#include <android/os/IExternalVibratorService.h>
+
+namespace android::os {
+
+enum class HapticScale {
+ MUTE = IExternalVibratorService::SCALE_MUTE,
+ VERY_LOW = IExternalVibratorService::SCALE_VERY_LOW,
+ LOW = IExternalVibratorService::SCALE_LOW,
+ NONE = IExternalVibratorService::SCALE_NONE,
+ HIGH = IExternalVibratorService::SCALE_HIGH,
+ VERY_HIGH = IExternalVibratorService::SCALE_VERY_HIGH,
+};
+
+bool isValidHapticScale(HapticScale scale);
+
+void scaleHapticData(float* buffer, size_t length, HapticScale scale);
+
+} // namespace android::os
+
+#endif // ANDROID_EXTERNAL_VIBRATION_UTILS_H