Eric Laurent | a198a29 | 2014-02-18 16:26:17 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2014 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 | |
| 17 | package android.media; |
| 18 | |
Artur Satayev | 53fe966 | 2019-12-10 17:47:55 +0000 | [diff] [blame^] | 19 | import android.compat.annotation.UnsupportedAppUsage; |
Mathew Inwood | 31a792a | 2018-08-17 08:54:26 +0100 | [diff] [blame] | 20 | |
Eric Laurent | a198a29 | 2014-02-18 16:26:17 -0800 | [diff] [blame] | 21 | /** |
| 22 | * The AudioGain describes a gain controller. Gain controllers are exposed by |
| 23 | * audio ports when the gain is configurable at this port's input or output. |
| 24 | * Gain values are expressed in millibels. |
| 25 | * A gain controller has the following attributes: |
| 26 | * - mode: defines modes of operation or features |
| 27 | * MODE_JOINT: all channel gains are controlled simultaneously |
| 28 | * MODE_CHANNELS: each channel gain is controlled individually |
| 29 | * MODE_RAMP: ramps can be applied when gain changes |
| 30 | * - channel mask: indicates for which channels the gain can be controlled |
| 31 | * - min value: minimum gain value in millibel |
| 32 | * - max value: maximum gain value in millibel |
| 33 | * - default value: gain value after reset in millibel |
| 34 | * - step value: granularity of gain control in millibel |
| 35 | * - min ramp duration: minimum ramp duration in milliseconds |
| 36 | * - max ramp duration: maximum ramp duration in milliseconds |
| 37 | * |
| 38 | * This object is always created by the framework and read only by applications. |
| 39 | * Applications get a list of AudioGainDescriptors from AudioPortDescriptor.gains() and can build a |
| 40 | * valid gain configuration from AudioGain.buildConfig() |
| 41 | * @hide |
| 42 | */ |
| 43 | public class AudioGain { |
| 44 | |
| 45 | /** |
| 46 | * Bit of AudioGain.mode() field indicating that |
| 47 | * all channel gains are controlled simultaneously |
| 48 | */ |
| 49 | public static final int MODE_JOINT = 1; |
| 50 | /** |
| 51 | * Bit of AudioGain.mode() field indicating that |
| 52 | * each channel gain is controlled individually |
| 53 | */ |
| 54 | public static final int MODE_CHANNELS = 2; |
| 55 | /** |
| 56 | * Bit of AudioGain.mode() field indicating that |
| 57 | * ramps can be applied when gain changes. The type of ramp (linear, log etc...) is |
| 58 | * implementation specific. |
| 59 | */ |
| 60 | public static final int MODE_RAMP = 4; |
| 61 | |
| 62 | private final int mIndex; |
| 63 | private final int mMode; |
| 64 | private final int mChannelMask; |
| 65 | private final int mMinValue; |
| 66 | private final int mMaxValue; |
| 67 | private final int mDefaultValue; |
| 68 | private final int mStepValue; |
| 69 | private final int mRampDurationMinMs; |
| 70 | private final int mRampDurationMaxMs; |
| 71 | |
| 72 | // The channel mask passed to the constructor is as specified in AudioFormat |
| 73 | // (e.g. AudioFormat.CHANNEL_OUT_STEREO) |
Mathew Inwood | 31a792a | 2018-08-17 08:54:26 +0100 | [diff] [blame] | 74 | @UnsupportedAppUsage |
Eric Laurent | a198a29 | 2014-02-18 16:26:17 -0800 | [diff] [blame] | 75 | AudioGain(int index, int mode, int channelMask, |
| 76 | int minValue, int maxValue, int defaultValue, int stepValue, |
| 77 | int rampDurationMinMs, int rampDurationMaxMs) { |
| 78 | mIndex = index; |
| 79 | mMode = mode; |
| 80 | mChannelMask = channelMask; |
| 81 | mMinValue = minValue; |
| 82 | mMaxValue = maxValue; |
| 83 | mDefaultValue = defaultValue; |
| 84 | mStepValue = stepValue; |
| 85 | mRampDurationMinMs = rampDurationMinMs; |
| 86 | mRampDurationMaxMs = rampDurationMaxMs; |
| 87 | } |
| 88 | |
| 89 | /** |
| 90 | * Bit field indicating supported modes of operation |
| 91 | */ |
| 92 | public int mode() { |
| 93 | return mMode; |
| 94 | } |
| 95 | |
| 96 | /** |
| 97 | * Indicates for which channels the gain can be controlled |
| 98 | * (e.g. AudioFormat.CHANNEL_OUT_STEREO) |
| 99 | */ |
| 100 | public int channelMask() { |
| 101 | return mChannelMask; |
| 102 | } |
| 103 | |
| 104 | /** |
| 105 | * Minimum gain value in millibel |
| 106 | */ |
| 107 | public int minValue() { |
| 108 | return mMinValue; |
| 109 | } |
| 110 | |
| 111 | /** |
| 112 | * Maximum gain value in millibel |
| 113 | */ |
| 114 | public int maxValue() { |
| 115 | return mMaxValue; |
| 116 | } |
| 117 | |
| 118 | /** |
| 119 | * Default gain value in millibel |
| 120 | */ |
| 121 | public int defaultValue() { |
| 122 | return mDefaultValue; |
| 123 | } |
| 124 | |
| 125 | /** |
| 126 | * Granularity of gain control in millibel |
| 127 | */ |
| 128 | public int stepValue() { |
| 129 | return mStepValue; |
| 130 | } |
| 131 | |
| 132 | /** |
| 133 | * Minimum ramp duration in milliseconds |
| 134 | * 0 if MODE_RAMP not set |
| 135 | */ |
| 136 | public int rampDurationMinMs() { |
| 137 | return mRampDurationMinMs; |
| 138 | } |
| 139 | |
| 140 | /** |
| 141 | * Maximum ramp duration in milliseconds |
| 142 | * 0 if MODE_RAMP not set |
| 143 | */ |
| 144 | public int rampDurationMaxMs() { |
| 145 | return mRampDurationMaxMs; |
| 146 | } |
| 147 | |
| 148 | /** |
| 149 | * Build a valid gain configuration for this gain controller for use by |
| 150 | * AudioPortDescriptor.setGain() |
| 151 | * @param mode: desired mode of operation |
| 152 | * @param channelMask: channels of which the gain should be modified. |
| 153 | * @param values: gain values for each channels. |
| 154 | * @param rampDurationMs: ramp duration if mode MODE_RAMP is set. |
| 155 | * ignored if MODE_JOINT. |
| 156 | */ |
| 157 | public AudioGainConfig buildConfig(int mode, int channelMask, |
| 158 | int[] values, int rampDurationMs) { |
| 159 | //TODO: check params here |
| 160 | return new AudioGainConfig(mIndex, this, mode, channelMask, values, rampDurationMs); |
| 161 | } |
| 162 | } |