1 /*
2 * Copyright (C) 2015 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 #define LOG_TAG "APM::AudioPolicyEngine/Stream"
18
19 #include "Stream.h"
20 #include <system/audio.h>
21
22 using std::string;
23
24 namespace android
25 {
26 namespace audio_policy
27 {
28
setIdentifier(audio_stream_type_t identifier)29 status_t Element<audio_stream_type_t>::setIdentifier(audio_stream_type_t identifier)
30 {
31 if (identifier > AUDIO_STREAM_CNT) {
32 return BAD_VALUE;
33 }
34 mIdentifier = identifier;
35 ALOGD("%s: Stream %s identifier 0x%X", __FUNCTION__, getName().c_str(), identifier);
36 return NO_ERROR;
37 }
38
39 /**
40 * Set the strategy to follow for this stream.
41 * It checks if the strategy is valid.
42 *
43 * @param[in] strategy to be followed.
44 *
45 * @return NO_ERROR if the strategy is set correctly, error code otherwise.
46 */
47 template <>
set(routing_strategy strategy)48 status_t Element<audio_stream_type_t>::set<routing_strategy>(routing_strategy strategy)
49 {
50 if (strategy >= NUM_STRATEGIES) {
51 return BAD_VALUE;
52 }
53 mApplicableStrategy = strategy;
54 ALOGD("%s: 0x%X for Stream %s", __FUNCTION__, strategy, getName().c_str());
55 return NO_ERROR;
56 }
57
58 template <>
get() const59 routing_strategy Element<audio_stream_type_t>::get<routing_strategy>() const
60 {
61 ALOGV("%s: 0x%X for Stream %s", __FUNCTION__, mApplicableStrategy, getName().c_str());
62 return mApplicableStrategy;
63 }
64
setVolumeProfile(Volume::device_category category,const VolumeCurvePoints & points)65 status_t Element<audio_stream_type_t>::setVolumeProfile(Volume::device_category category,
66 const VolumeCurvePoints &points)
67 {
68 ALOGD("%s: adding volume profile for %s for device category %d, points nb =%d", __FUNCTION__,
69 getName().c_str(), category, points.size());
70 mVolumeProfiles[category] = points;
71
72 for (size_t i = 0; i < points.size(); i++) {
73 ALOGV("%s: %s cat=%d curve index =%d Index=%d dBAttenuation=%f",
74 __FUNCTION__, getName().c_str(), category, i, points[i].mIndex,
75 points[i].mDBAttenuation);
76 }
77 return NO_ERROR;
78 }
79
initVolume(int indexMin,int indexMax)80 status_t Element<audio_stream_type_t>::initVolume(int indexMin, int indexMax)
81 {
82 ALOGV("initStreamVolume() stream %s, min %d, max %d", getName().c_str(), indexMin, indexMax);
83 if (indexMin < 0 || indexMin >= indexMax) {
84 ALOGW("initStreamVolume() invalid index limits for stream %s, min %d, max %d",
85 getName().c_str(), indexMin, indexMax);
86 return BAD_VALUE;
87 }
88 mIndexMin = indexMin;
89 mIndexMax = indexMax;
90
91 return NO_ERROR;
92 }
93
volIndexToDb(Volume::device_category deviceCategory,int indexInUi)94 float Element<audio_stream_type_t>::volIndexToDb(Volume::device_category deviceCategory,
95 int indexInUi)
96 {
97 VolumeProfileConstIterator it = mVolumeProfiles.find(deviceCategory);
98 if (it == mVolumeProfiles.end()) {
99 ALOGE("%s: device category %d not found for stream %s", __FUNCTION__, deviceCategory,
100 getName().c_str());
101 return 1.0f;
102 }
103 const VolumeCurvePoints curve = mVolumeProfiles[deviceCategory];
104 if (curve.size() != Volume::VOLCNT) {
105 ALOGE("%s: invalid profile for category %d and for stream %s", __FUNCTION__, deviceCategory,
106 getName().c_str());
107 return 1.0f;
108 }
109
110 // the volume index in the UI is relative to the min and max volume indices for this stream type
111 int nbSteps = 1 + curve[Volume::VOLMAX].mIndex -
112 curve[Volume::VOLMIN].mIndex;
113
114 if (mIndexMax - mIndexMin == 0) {
115 ALOGE("%s: Invalid volume indexes Min=Max=%d", __FUNCTION__, mIndexMin);
116 return 1.0f;
117 }
118 int volIdx = (nbSteps * (indexInUi - mIndexMin)) /
119 (mIndexMax - mIndexMin);
120
121 // find what part of the curve this index volume belongs to, or if it's out of bounds
122 int segment = 0;
123 if (volIdx < curve[Volume::VOLMIN].mIndex) { // out of bounds
124 return 0.0f;
125 } else if (volIdx < curve[Volume::VOLKNEE1].mIndex) {
126 segment = 0;
127 } else if (volIdx < curve[Volume::VOLKNEE2].mIndex) {
128 segment = 1;
129 } else if (volIdx <= curve[Volume::VOLMAX].mIndex) {
130 segment = 2;
131 } else { // out of bounds
132 return 1.0f;
133 }
134
135 // linear interpolation in the attenuation table in dB
136 float decibels = curve[segment].mDBAttenuation +
137 ((float)(volIdx - curve[segment].mIndex)) *
138 ( (curve[segment+1].mDBAttenuation -
139 curve[segment].mDBAttenuation) /
140 ((float)(curve[segment+1].mIndex -
141 curve[segment].mIndex)) );
142
143 ALOGV("VOLUME vol index=[%d %d %d], dB=[%.1f %.1f %.1f]",
144 curve[segment].mIndex, volIdx,
145 curve[segment+1].mIndex,
146 curve[segment].mDBAttenuation,
147 decibels,
148 curve[segment+1].mDBAttenuation);
149
150 return decibels;
151 }
152
153 } // namespace audio_policy
154 } // namespace android
155
156