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1/*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package android.hardware.audio.effect@2.0;
18
19import android.hardware.audio.common@2.0;
20import IEffect;
21
22interface IVisualizerEffect extends IEffect {
23    enum CaptureSizeRange : int32_t {
24        MAX = 1024,  // maximum capture size in samples
25        MIN = 128    // minimum capture size in samples
26    };
27
28    /**
29     * Sets the number PCM samples in the capture.
30     */
31    setCaptureSize(uint16_t captureSize) generates (Result retval);
32
33    /**
34     * Gets the number PCM samples in the capture.
35     */
36    getCaptureSize() generates (Result retval, uint16_t captureSize);
37
38    enum ScalingMode : int32_t {
39        // Keep in sync with SCALING_MODE_... in
40        // frameworks/base/media/java/android/media/audiofx/Visualizer.java
41        NORMALIZED = 0,
42        AS_PLAYED = 1
43    };
44
45    /**
46     * Specifies the way the captured data is scaled.
47     */
48    setScalingMode(ScalingMode scalingMode) generates (Result retval);
49
50    /**
51     * Retrieves the way the captured data is scaled.
52     */
53    getScalingMode() generates (Result retval, ScalingMode scalingMode);
54
55    /**
56     * Informs the visualizer about the downstream latency.
57     */
58    setLatency(uint32_t latencyMs) generates (Result retval);
59
60    /**
61     * Gets the downstream latency.
62     */
63    getLatency() generates (Result retval, uint32_t latencyMs);
64
65    enum MeasurementMode : int32_t {
66        // Keep in sync with MEASUREMENT_MODE_... in
67        // frameworks/base/media/java/android/media/audiofx/Visualizer.java
68        NONE = 0x0,
69        PEAK_RMS = 0x1
70    };
71
72    /**
73     * Specifies which measurements are to be made.
74     */
75    setMeasurementMode(MeasurementMode measurementMode)
76            generates (Result retval);
77
78    /**
79     * Retrieves which measurements are to be made.
80     */
81    getMeasurementMode() generates (
82            Result retval, MeasurementMode measurementMode);
83
84    /**
85     * Retrieves the latest PCM snapshot captured by the visualizer engine.  The
86     * number of samples to capture is specified by 'setCaptureSize' parameter.
87     *
88     * @return retval operation completion status.
89     * @return samples samples in 8 bit unsigned format (0 = 0x80)
90     */
91    capture() generates (Result retval, vec<uint8_t> samples);
92
93    struct Measurement {
94        MeasurementMode mode;    // discriminator
95        union Values {
96            struct PeakAndRms {
97                int32_t peakMb;  // millibels
98                int32_t rmsMb;   // millibels
99            } peakAndRms;
100        } value;
101    };
102    /**
103     * Retrieves the latest measurements. The measurements to be made
104     * are specified by 'setMeasurementMode' parameter.
105     *
106     * @return retval operation completion status.
107     * @return result measurement.
108     */
109    measure() generates (Result retval, Measurement result);
110};
111