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/*
* Copyright (C) 2015 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.
*/
#define LOG_TAG "APM::AudioPolicyEngine/Stream"
#include "Stream.h"
#include <system/audio.h>
using std::string;
namespace android
{
namespace audio_policy
{
status_t Element<audio_stream_type_t>::setIdentifier(audio_stream_type_t identifier)
{
if (identifier > AUDIO_STREAM_CNT) {
return BAD_VALUE;
}
mIdentifier = identifier;
ALOGD("%s: Stream %s identifier 0x%X", __FUNCTION__, getName().c_str(), identifier);
return NO_ERROR;
}
/**
* Set the strategy to follow for this stream.
* It checks if the strategy is valid.
*
* @param[in] strategy to be followed.
*
* @return NO_ERROR if the strategy is set correctly, error code otherwise.
*/
template <>
status_t Element<audio_stream_type_t>::set<routing_strategy>(routing_strategy strategy)
{
if (strategy >= NUM_STRATEGIES) {
return BAD_VALUE;
}
mApplicableStrategy = strategy;
ALOGD("%s: 0x%X for Stream %s", __FUNCTION__, strategy, getName().c_str());
return NO_ERROR;
}
template <>
routing_strategy Element<audio_stream_type_t>::get<routing_strategy>() const
{
ALOGV("%s: 0x%X for Stream %s", __FUNCTION__, mApplicableStrategy, getName().c_str());
return mApplicableStrategy;
}
status_t Element<audio_stream_type_t>::setVolumeProfile(Volume::device_category category,
const VolumeCurvePoints &points)
{
ALOGD("%s: adding volume profile for %s for device category %d, points nb =%d", __FUNCTION__,
getName().c_str(), category, points.size());
mVolumeProfiles[category] = points;
for (size_t i = 0; i < points.size(); i++) {
ALOGV("%s: %s cat=%d curve index =%d Index=%d dBAttenuation=%f",
__FUNCTION__, getName().c_str(), category, i, points[i].mIndex,
points[i].mDBAttenuation);
}
return NO_ERROR;
}
status_t Element<audio_stream_type_t>::initVolume(int indexMin, int indexMax)
{
ALOGV("initStreamVolume() stream %s, min %d, max %d", getName().c_str(), indexMin, indexMax);
if (indexMin < 0 || indexMin >= indexMax) {
ALOGW("initStreamVolume() invalid index limits for stream %s, min %d, max %d",
getName().c_str(), indexMin, indexMax);
return BAD_VALUE;
}
mIndexMin = indexMin;
mIndexMax = indexMax;
return NO_ERROR;
}
float Element<audio_stream_type_t>::volIndexToDb(Volume::device_category deviceCategory,
int indexInUi)
{
VolumeProfileConstIterator it = mVolumeProfiles.find(deviceCategory);
if (it == mVolumeProfiles.end()) {
ALOGE("%s: device category %d not found for stream %s", __FUNCTION__, deviceCategory,
getName().c_str());
return 0.0f;
}
const VolumeCurvePoints curve = mVolumeProfiles[deviceCategory];
if (curve.size() != Volume::VOLCNT) {
ALOGE("%s: invalid profile for category %d and for stream %s", __FUNCTION__, deviceCategory,
getName().c_str());
return 0.0f;
}
// the volume index in the UI is relative to the min and max volume indices for this stream type
int nbSteps = 1 + curve[Volume::VOLMAX].mIndex -
curve[Volume::VOLMIN].mIndex;
if (mIndexMax - mIndexMin == 0) {
ALOGE("%s: Invalid volume indexes Min=Max=%d", __FUNCTION__, mIndexMin);
return 0.0f;
}
int volIdx = (nbSteps * (indexInUi - mIndexMin)) /
(mIndexMax - mIndexMin);
// find what part of the curve this index volume belongs to, or if it's out of bounds
int segment = 0;
if (volIdx < curve[Volume::VOLMIN].mIndex) { // out of bounds
return VOLUME_MIN_DB;
} else if (volIdx < curve[Volume::VOLKNEE1].mIndex) {
segment = 0;
} else if (volIdx < curve[Volume::VOLKNEE2].mIndex) {
segment = 1;
} else if (volIdx <= curve[Volume::VOLMAX].mIndex) {
segment = 2;
} else { // out of bounds
return 0.0f;
}
// linear interpolation in the attenuation table in dB
float decibels = curve[segment].mDBAttenuation +
((float)(volIdx - curve[segment].mIndex)) *
( (curve[segment+1].mDBAttenuation -
curve[segment].mDBAttenuation) /
((float)(curve[segment+1].mIndex -
curve[segment].mIndex)) );
ALOGV("VOLUME vol index=[%d %d %d], dB=[%.1f %.1f %.1f]",
curve[segment].mIndex, volIdx,
curve[segment+1].mIndex,
curve[segment].mDBAttenuation,
decibels,
curve[segment+1].mDBAttenuation);
return decibels;
}
} // namespace audio_policy
} // namespace android
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