services/audiopolicy/enginedefault/src/Engine.cpp

/*
 * 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"
//#define LOG_NDEBUG 0

//#define VERY_VERBOSE_LOGGING
#ifdef VERY_VERBOSE_LOGGING
#define ALOGVV ALOGV
#else
#define ALOGVV(a...) do { } while(0)
#endif

#include "Engine.h"
#include <android-base/macros.h>
#include <AudioPolicyManagerObserver.h>
#include <AudioPort.h>
#include <IOProfile.h>
#include <AudioIODescriptorInterface.h>
#include <policy.h>
#include <utils/String8.h>
#include <utils/Log.h>

namespace android
{
namespace audio_policy
{

struct legacy_strategy_map { const char *name; legacy_strategy id; };
static const std::vector<legacy_strategy_map> gLegacyStrategy = {
    { "STRATEGY_NONE", STRATEGY_NONE },
    { "STRATEGY_MEDIA", STRATEGY_MEDIA },
    { "STRATEGY_PHONE", STRATEGY_PHONE },
    { "STRATEGY_SONIFICATION", STRATEGY_SONIFICATION },
    { "STRATEGY_SONIFICATION_RESPECTFUL", STRATEGY_SONIFICATION_RESPECTFUL },
    { "STRATEGY_DTMF", STRATEGY_DTMF },
    { "STRATEGY_ENFORCED_AUDIBLE", STRATEGY_ENFORCED_AUDIBLE },
    { "STRATEGY_TRANSMITTED_THROUGH_SPEAKER", STRATEGY_TRANSMITTED_THROUGH_SPEAKER },
    { "STRATEGY_ACCESSIBILITY", STRATEGY_ACCESSIBILITY },
    { "STRATEGY_REROUTING", STRATEGY_REROUTING },
    { "STRATEGY_PATCH", STRATEGY_REROUTING }, // boiler to manage stream patch volume
};

Engine::Engine()
{
    auto result = EngineBase::loadAudioPolicyEngineConfig();
    ALOGE_IF(result.nbSkippedElement != 0,
             "Policy Engine configuration is partially invalid, skipped %zu elements",
             result.nbSkippedElement);

    for (const auto &strategy : gLegacyStrategy) {
        mLegacyStrategyMap[getProductStrategyByName(strategy.name)] = strategy.id;
    }
}

status_t Engine::setForceUse(audio_policy_force_use_t usage, audio_policy_forced_cfg_t config)
{
    switch(usage) {
    case AUDIO_POLICY_FORCE_FOR_COMMUNICATION:
        if (config != AUDIO_POLICY_FORCE_SPEAKER && config != AUDIO_POLICY_FORCE_BT_SCO &&
            config != AUDIO_POLICY_FORCE_NONE) {
            ALOGW("setForceUse() invalid config %d for FOR_COMMUNICATION", config);
            return BAD_VALUE;
        }
        break;
    case AUDIO_POLICY_FORCE_FOR_MEDIA:
        if (config != AUDIO_POLICY_FORCE_HEADPHONES && config != AUDIO_POLICY_FORCE_BT_A2DP &&
            config != AUDIO_POLICY_FORCE_WIRED_ACCESSORY &&
            config != AUDIO_POLICY_FORCE_ANALOG_DOCK &&
            config != AUDIO_POLICY_FORCE_DIGITAL_DOCK && config != AUDIO_POLICY_FORCE_NONE &&
            config != AUDIO_POLICY_FORCE_NO_BT_A2DP && config != AUDIO_POLICY_FORCE_SPEAKER ) {
            ALOGW("setForceUse() invalid config %d for FOR_MEDIA", config);
            return BAD_VALUE;
        }
        break;
    case AUDIO_POLICY_FORCE_FOR_RECORD:
        if (config != AUDIO_POLICY_FORCE_BT_SCO && config != AUDIO_POLICY_FORCE_WIRED_ACCESSORY &&
            config != AUDIO_POLICY_FORCE_NONE) {
            ALOGW("setForceUse() invalid config %d for FOR_RECORD", config);
            return BAD_VALUE;
        }
        break;
    case AUDIO_POLICY_FORCE_FOR_DOCK:
        if (config != AUDIO_POLICY_FORCE_NONE && config != AUDIO_POLICY_FORCE_BT_CAR_DOCK &&
            config != AUDIO_POLICY_FORCE_BT_DESK_DOCK &&
            config != AUDIO_POLICY_FORCE_WIRED_ACCESSORY &&
            config != AUDIO_POLICY_FORCE_ANALOG_DOCK &&
            config != AUDIO_POLICY_FORCE_DIGITAL_DOCK) {
            ALOGW("setForceUse() invalid config %d for FOR_DOCK", config);
        }
        break;
    case AUDIO_POLICY_FORCE_FOR_SYSTEM:
        if (config != AUDIO_POLICY_FORCE_NONE &&
            config != AUDIO_POLICY_FORCE_SYSTEM_ENFORCED) {
            ALOGW("setForceUse() invalid config %d for FOR_SYSTEM", config);
        }
        break;
    case AUDIO_POLICY_FORCE_FOR_HDMI_SYSTEM_AUDIO:
        if (config != AUDIO_POLICY_FORCE_NONE &&
            config != AUDIO_POLICY_FORCE_HDMI_SYSTEM_AUDIO_ENFORCED) {
            ALOGW("setForceUse() invalid config %d for HDMI_SYSTEM_AUDIO", config);
        }
        break;
    case AUDIO_POLICY_FORCE_FOR_ENCODED_SURROUND:
        if (config != AUDIO_POLICY_FORCE_NONE &&
                config != AUDIO_POLICY_FORCE_ENCODED_SURROUND_NEVER &&
                config != AUDIO_POLICY_FORCE_ENCODED_SURROUND_ALWAYS &&
                config != AUDIO_POLICY_FORCE_ENCODED_SURROUND_MANUAL) {
            ALOGW("setForceUse() invalid config %d for ENCODED_SURROUND", config);
            return BAD_VALUE;
        }
        break;
    case AUDIO_POLICY_FORCE_FOR_VIBRATE_RINGING:
        if (config != AUDIO_POLICY_FORCE_BT_SCO && config != AUDIO_POLICY_FORCE_NONE) {
            ALOGW("setForceUse() invalid config %d for FOR_VIBRATE_RINGING", config);
            return BAD_VALUE;
        }
        break;
    default:
        ALOGW("setForceUse() invalid usage %d", usage);
        break; // TODO return BAD_VALUE?
    }
    return EngineBase::setForceUse(usage, config);
}

audio_devices_t Engine::getDeviceForStrategyInt(legacy_strategy strategy,
                                                DeviceVector availableOutputDevices,
                                                DeviceVector availableInputDevices,
                                                const SwAudioOutputCollection &outputs,
                                                uint32_t outputDeviceTypesToIgnore) const
{
    uint32_t device = AUDIO_DEVICE_NONE;
    uint32_t availableOutputDevicesType =
            availableOutputDevices.types() & ~outputDeviceTypesToIgnore;

    switch (strategy) {

    case STRATEGY_TRANSMITTED_THROUGH_SPEAKER:
        device = availableOutputDevicesType & AUDIO_DEVICE_OUT_SPEAKER;
        break;

    case STRATEGY_SONIFICATION_RESPECTFUL:
        if (isInCall() || outputs.isActiveLocally(toVolumeSource(AUDIO_STREAM_VOICE_CALL))) {
            device = getDeviceForStrategyInt(
                    STRATEGY_SONIFICATION, availableOutputDevices, availableInputDevices, outputs,
                    outputDeviceTypesToIgnore);
        } else {
            bool media_active_locally =
                    outputs.isActiveLocally(toVolumeSource(AUDIO_STREAM_MUSIC),
                                            SONIFICATION_RESPECTFUL_AFTER_MUSIC_DELAY)
                    || outputs.isActiveLocally(
                        toVolumeSource(AUDIO_STREAM_ACCESSIBILITY),
                        SONIFICATION_RESPECTFUL_AFTER_MUSIC_DELAY);
            // routing is same as media without the "remote" device
            device = getDeviceForStrategyInt(STRATEGY_MEDIA,
                    availableOutputDevices,
                    availableInputDevices, outputs,
                    AUDIO_DEVICE_OUT_REMOTE_SUBMIX | outputDeviceTypesToIgnore);
            // if no media is playing on the device, check for mandatory use of "safe" speaker
            // when media would have played on speaker, and the safe speaker path is available
            if (!media_active_locally
                    && (device & AUDIO_DEVICE_OUT_SPEAKER)
                    && (availableOutputDevicesType & AUDIO_DEVICE_OUT_SPEAKER_SAFE)) {
                device |= AUDIO_DEVICE_OUT_SPEAKER_SAFE;
                device &= ~AUDIO_DEVICE_OUT_SPEAKER;
            }
        }
        break;

    case STRATEGY_DTMF:
        if (!isInCall()) {
            // when off call, DTMF strategy follows the same rules as MEDIA strategy
            device = getDeviceForStrategyInt(
                    STRATEGY_MEDIA, availableOutputDevices, availableInputDevices, outputs,
                    outputDeviceTypesToIgnore);
            break;
        }
        // when in call, DTMF and PHONE strategies follow the same rules
        FALLTHROUGH_INTENDED;

    case STRATEGY_PHONE:
        // Force use of only devices on primary output if:
        // - in call AND
        //   - cannot route from voice call RX OR
        //   - audio HAL version is < 3.0 and TX device is on the primary HW module
        if (getPhoneState() == AUDIO_MODE_IN_CALL) {
            audio_devices_t txDevice = getDeviceForInputSource(AUDIO_SOURCE_VOICE_COMMUNICATION);
            sp<AudioOutputDescriptor> primaryOutput = outputs.getPrimaryOutput();
            audio_devices_t availPrimaryInputDevices =
                 availableInputDevices.getDeviceTypesFromHwModule(primaryOutput->getModuleHandle());

            // TODO: getPrimaryOutput return only devices from first module in
            // audio_policy_configuration.xml, hearing aid is not there, but it's
            // a primary device
            // FIXME: this is not the right way of solving this problem
            audio_devices_t availPrimaryOutputDevices =
                (primaryOutput->supportedDevices().types() | AUDIO_DEVICE_OUT_HEARING_AID) &
                availableOutputDevices.types();

            if (((availableInputDevices.types() &
                    AUDIO_DEVICE_IN_TELEPHONY_RX & ~AUDIO_DEVICE_BIT_IN) == 0) ||
                    (((txDevice & availPrimaryInputDevices & ~AUDIO_DEVICE_BIT_IN) != 0) &&
                         (primaryOutput->getAudioPort()->getModuleVersionMajor() < 3))) {
                availableOutputDevicesType = availPrimaryOutputDevices;
            }
        }
        // for phone strategy, we first consider the forced use and then the available devices by
        // order of priority
        switch (getForceUse(AUDIO_POLICY_FORCE_FOR_COMMUNICATION)) {
        case AUDIO_POLICY_FORCE_BT_SCO:
            if (!isInCall() || strategy != STRATEGY_DTMF) {
                device = availableOutputDevicesType & AUDIO_DEVICE_OUT_BLUETOOTH_SCO_CARKIT;
                if (device) break;
            }
            device = availableOutputDevicesType & AUDIO_DEVICE_OUT_BLUETOOTH_SCO_HEADSET;
            if (device) break;
            device = availableOutputDevicesType & AUDIO_DEVICE_OUT_BLUETOOTH_SCO;
            if (device) break;
            // if SCO device is requested but no SCO device is available, fall back to default case
            FALLTHROUGH_INTENDED;

        default:    // FORCE_NONE
            device = availableOutputDevicesType & AUDIO_DEVICE_OUT_HEARING_AID;
            if (device) break;
            // when not in a phone call, phone strategy should route STREAM_VOICE_CALL to A2DP
            if (!isInCall() &&
                    (getForceUse(AUDIO_POLICY_FORCE_FOR_MEDIA) != AUDIO_POLICY_FORCE_NO_BT_A2DP) &&
                     outputs.isA2dpSupported()) {
                device = availableOutputDevicesType & AUDIO_DEVICE_OUT_BLUETOOTH_A2DP;
                if (device) break;
                device = availableOutputDevicesType & AUDIO_DEVICE_OUT_BLUETOOTH_A2DP_HEADPHONES;
                if (device) break;
            }
            device = availableOutputDevicesType & AUDIO_DEVICE_OUT_WIRED_HEADPHONE;
            if (device) break;
            device = availableOutputDevicesType & AUDIO_DEVICE_OUT_WIRED_HEADSET;
            if (device) break;
            device = availableOutputDevicesType & AUDIO_DEVICE_OUT_LINE;
            if (device) break;
            device = availableOutputDevicesType & AUDIO_DEVICE_OUT_USB_HEADSET;
            if (device) break;
            device = availableOutputDevicesType & AUDIO_DEVICE_OUT_USB_DEVICE;
            if (device) break;
            if (!isInCall()) {
                device = availableOutputDevicesType & AUDIO_DEVICE_OUT_USB_ACCESSORY;
                if (device) break;
                device = availableOutputDevicesType & AUDIO_DEVICE_OUT_DGTL_DOCK_HEADSET;
                if (device) break;
                device = availableOutputDevicesType & AUDIO_DEVICE_OUT_AUX_DIGITAL;
                if (device) break;
                device = availableOutputDevicesType & AUDIO_DEVICE_OUT_ANLG_DOCK_HEADSET;
                if (device) break;
            }
            device = availableOutputDevicesType & AUDIO_DEVICE_OUT_EARPIECE;
            break;

        case AUDIO_POLICY_FORCE_SPEAKER:
            // when not in a phone call, phone strategy should route STREAM_VOICE_CALL to
            // A2DP speaker when forcing to speaker output
            if (!isInCall() &&
                    (getForceUse(AUDIO_POLICY_FORCE_FOR_MEDIA) != AUDIO_POLICY_FORCE_NO_BT_A2DP) &&
                     outputs.isA2dpSupported()) {
                device = availableOutputDevicesType & AUDIO_DEVICE_OUT_BLUETOOTH_A2DP_SPEAKER;
                if (device) break;
            }
            if (!isInCall()) {
                device = availableOutputDevicesType & AUDIO_DEVICE_OUT_USB_ACCESSORY;
                if (device) break;
                device = availableOutputDevicesType & AUDIO_DEVICE_OUT_USB_DEVICE;
                if (device) break;
                device = availableOutputDevicesType & AUDIO_DEVICE_OUT_DGTL_DOCK_HEADSET;
                if (device) break;
                device = availableOutputDevicesType & AUDIO_DEVICE_OUT_AUX_DIGITAL;
                if (device) break;
                device = availableOutputDevicesType & AUDIO_DEVICE_OUT_ANLG_DOCK_HEADSET;
                if (device) break;
            }
            device = availableOutputDevicesType & AUDIO_DEVICE_OUT_SPEAKER;
            break;
        }
    break;

    case STRATEGY_SONIFICATION:

        // If incall, just select the STRATEGY_PHONE device
        if (isInCall() ||
                outputs.isActiveLocally(toVolumeSource(AUDIO_STREAM_VOICE_CALL))) {
            device = getDeviceForStrategyInt(
                    STRATEGY_PHONE, availableOutputDevices, availableInputDevices, outputs,
                    outputDeviceTypesToIgnore);
            break;
        }
        FALLTHROUGH_INTENDED;

    case STRATEGY_ENFORCED_AUDIBLE:
        // strategy STRATEGY_ENFORCED_AUDIBLE uses same routing policy as STRATEGY_SONIFICATION
        // except:
        //   - when in call where it doesn't default to STRATEGY_PHONE behavior
        //   - in countries where not enforced in which case it follows STRATEGY_MEDIA

        if ((strategy == STRATEGY_SONIFICATION) ||
                (getForceUse(AUDIO_POLICY_FORCE_FOR_SYSTEM) == AUDIO_POLICY_FORCE_SYSTEM_ENFORCED)) {
            device = availableOutputDevicesType & AUDIO_DEVICE_OUT_SPEAKER;
        }

        // if SCO headset is connected and we are told to use it, play ringtone over
        // speaker and BT SCO
        if ((availableOutputDevicesType & AUDIO_DEVICE_OUT_ALL_SCO) != 0) {
            uint32_t device2 = AUDIO_DEVICE_NONE;
            device2 = availableOutputDevicesType & AUDIO_DEVICE_OUT_BLUETOOTH_SCO_CARKIT;
            if (device2 == AUDIO_DEVICE_NONE) {
                device2 = availableOutputDevicesType & AUDIO_DEVICE_OUT_BLUETOOTH_SCO_HEADSET;
            }
            if (device2 == AUDIO_DEVICE_NONE) {
                device2 = availableOutputDevicesType & AUDIO_DEVICE_OUT_BLUETOOTH_SCO;
            }
            // Use ONLY Bluetooth SCO output when ringing in vibration mode
            if (!((getForceUse(AUDIO_POLICY_FORCE_FOR_SYSTEM) == AUDIO_POLICY_FORCE_SYSTEM_ENFORCED)
                    && (strategy == STRATEGY_ENFORCED_AUDIBLE))) {
                if (getForceUse(AUDIO_POLICY_FORCE_FOR_VIBRATE_RINGING)
                        == AUDIO_POLICY_FORCE_BT_SCO) {
                    if (device2 != AUDIO_DEVICE_NONE) {
                        device = device2;
                        break;
                    }
                }
            }
            // Use both Bluetooth SCO and phone default output when ringing in normal mode
            if (getForceUse(AUDIO_POLICY_FORCE_FOR_COMMUNICATION) == AUDIO_POLICY_FORCE_BT_SCO) {
                if ((strategy == STRATEGY_SONIFICATION) &&
                        (device & AUDIO_DEVICE_OUT_SPEAKER) &&
                        (availableOutputDevicesType & AUDIO_DEVICE_OUT_SPEAKER_SAFE)) {
                    device |= AUDIO_DEVICE_OUT_SPEAKER_SAFE;
                    device &= ~AUDIO_DEVICE_OUT_SPEAKER;
                }
                if (device2 != AUDIO_DEVICE_NONE) {
                    device |= device2;
                    break;
                }
            }
        }
        // The second device used for sonification is the same as the device used by media strategy
        FALLTHROUGH_INTENDED;

    case STRATEGY_ACCESSIBILITY:
        if (strategy == STRATEGY_ACCESSIBILITY) {
            // do not route accessibility prompts to a digital output currently configured with a
            // compressed format as they would likely not be mixed and dropped.
            for (size_t i = 0; i < outputs.size(); i++) {
                sp<AudioOutputDescriptor> desc = outputs.valueAt(i);
                audio_devices_t devices = desc->devices().types() &
                    (AUDIO_DEVICE_OUT_HDMI | AUDIO_DEVICE_OUT_SPDIF | AUDIO_DEVICE_OUT_HDMI_ARC);
                if (desc->isActive() && !audio_is_linear_pcm(desc->mFormat) &&
                        devices != AUDIO_DEVICE_NONE) {
                    availableOutputDevicesType = availableOutputDevices.types() & ~devices;
                }
            }
            availableOutputDevices =
                    availableOutputDevices.getDevicesFromTypeMask(availableOutputDevicesType);
            if (outputs.isActive(toVolumeSource(AUDIO_STREAM_RING)) ||
                    outputs.isActive(toVolumeSource(AUDIO_STREAM_ALARM))) {
                return getDeviceForStrategyInt(
                    STRATEGY_SONIFICATION, availableOutputDevices, availableInputDevices, outputs,
                    outputDeviceTypesToIgnore);
            }
            if (isInCall()) {
                return getDeviceForStrategyInt(
                        STRATEGY_PHONE, availableOutputDevices, availableInputDevices, outputs,
                        outputDeviceTypesToIgnore);
            }
        }
        // For other cases, STRATEGY_ACCESSIBILITY behaves like STRATEGY_MEDIA
        FALLTHROUGH_INTENDED;

    // FIXME: STRATEGY_REROUTING follow STRATEGY_MEDIA for now
    case STRATEGY_REROUTING:
    case STRATEGY_MEDIA: {
        uint32_t device2 = AUDIO_DEVICE_NONE;
        if (strategy != STRATEGY_SONIFICATION) {
            // no sonification on remote submix (e.g. WFD)
            if (availableOutputDevices.getDevice(AUDIO_DEVICE_OUT_REMOTE_SUBMIX,
                                                 String8("0"), AUDIO_FORMAT_DEFAULT) != 0) {
                device2 = availableOutputDevices.types() & AUDIO_DEVICE_OUT_REMOTE_SUBMIX;
            }
        }
        if (isInCall() && (strategy == STRATEGY_MEDIA)) {
            device = getDeviceForStrategyInt(
                    STRATEGY_PHONE, availableOutputDevices, availableInputDevices, outputs,
                    outputDeviceTypesToIgnore);
            break;
        }
        // FIXME: Find a better solution to prevent routing to BT hearing aid(b/122931261).
        if ((device2 == AUDIO_DEVICE_NONE) &&
                (getForceUse(AUDIO_POLICY_FORCE_FOR_MEDIA) != AUDIO_POLICY_FORCE_NO_BT_A2DP)) {
            device2 = availableOutputDevicesType & AUDIO_DEVICE_OUT_HEARING_AID;
        }
        if ((device2 == AUDIO_DEVICE_NONE) &&
                (getForceUse(AUDIO_POLICY_FORCE_FOR_MEDIA) != AUDIO_POLICY_FORCE_NO_BT_A2DP) &&
                 outputs.isA2dpSupported()) {
            device2 = availableOutputDevicesType & AUDIO_DEVICE_OUT_BLUETOOTH_A2DP;
            if (device2 == AUDIO_DEVICE_NONE) {
                device2 = availableOutputDevicesType & AUDIO_DEVICE_OUT_BLUETOOTH_A2DP_HEADPHONES;
            }
            if (device2 == AUDIO_DEVICE_NONE) {
                device2 = availableOutputDevicesType & AUDIO_DEVICE_OUT_BLUETOOTH_A2DP_SPEAKER;
            }
        }
        if ((device2 == AUDIO_DEVICE_NONE) &&
            (getForceUse(AUDIO_POLICY_FORCE_FOR_MEDIA) == AUDIO_POLICY_FORCE_SPEAKER)) {
            device2 = availableOutputDevicesType & AUDIO_DEVICE_OUT_SPEAKER;
        }
        if (device2 == AUDIO_DEVICE_NONE) {
            device2 = availableOutputDevicesType & AUDIO_DEVICE_OUT_WIRED_HEADPHONE;
        }
        if (device2 == AUDIO_DEVICE_NONE) {
            device2 = availableOutputDevicesType & AUDIO_DEVICE_OUT_LINE;
        }
        if (device2 == AUDIO_DEVICE_NONE) {
            device2 = availableOutputDevicesType & AUDIO_DEVICE_OUT_WIRED_HEADSET;
        }
        if (device2 == AUDIO_DEVICE_NONE) {
            device2 = availableOutputDevicesType & AUDIO_DEVICE_OUT_USB_HEADSET;
        }
        if (device2 == AUDIO_DEVICE_NONE) {
            device2 = availableOutputDevicesType & AUDIO_DEVICE_OUT_USB_ACCESSORY;
        }
        if (device2 == AUDIO_DEVICE_NONE) {
            device2 = availableOutputDevicesType & AUDIO_DEVICE_OUT_USB_DEVICE;
        }
        if (device2 == AUDIO_DEVICE_NONE) {
            device2 = availableOutputDevicesType & AUDIO_DEVICE_OUT_DGTL_DOCK_HEADSET;
        }
        if ((device2 == AUDIO_DEVICE_NONE) && (strategy != STRATEGY_SONIFICATION)) {
            // no sonification on aux digital (e.g. HDMI)
            device2 = availableOutputDevicesType & AUDIO_DEVICE_OUT_AUX_DIGITAL;
        }
        if ((device2 == AUDIO_DEVICE_NONE) &&
                (getForceUse(AUDIO_POLICY_FORCE_FOR_DOCK) == AUDIO_POLICY_FORCE_ANALOG_DOCK)) {
            device2 = availableOutputDevicesType & AUDIO_DEVICE_OUT_ANLG_DOCK_HEADSET;
        }
        if (device2 == AUDIO_DEVICE_NONE) {
            device2 = availableOutputDevicesType & AUDIO_DEVICE_OUT_SPEAKER;
        }
        int device3 = AUDIO_DEVICE_NONE;
        if (strategy == STRATEGY_MEDIA) {
            // ARC, SPDIF and AUX_LINE can co-exist with others.
            device3 = availableOutputDevicesType & AUDIO_DEVICE_OUT_HDMI_ARC;
            device3 |= (availableOutputDevicesType & AUDIO_DEVICE_OUT_SPDIF);
            device3 |= (availableOutputDevicesType & AUDIO_DEVICE_OUT_AUX_LINE);
        }

        device2 |= device3;
        // device is DEVICE_OUT_SPEAKER if we come from case STRATEGY_SONIFICATION or
        // STRATEGY_ENFORCED_AUDIBLE, AUDIO_DEVICE_NONE otherwise
        device |= device2;

        // If hdmi system audio mode is on, remove speaker out of output list.
        if ((strategy == STRATEGY_MEDIA) &&
            (getForceUse(AUDIO_POLICY_FORCE_FOR_HDMI_SYSTEM_AUDIO) ==
                AUDIO_POLICY_FORCE_HDMI_SYSTEM_AUDIO_ENFORCED)) {
            device &= ~AUDIO_DEVICE_OUT_SPEAKER;
        }

        // for STRATEGY_SONIFICATION:
        // if SPEAKER was selected, and SPEAKER_SAFE is available, use SPEAKER_SAFE instead
        if ((strategy == STRATEGY_SONIFICATION) &&
                (device & AUDIO_DEVICE_OUT_SPEAKER) &&
                (availableOutputDevicesType & AUDIO_DEVICE_OUT_SPEAKER_SAFE)) {
            device |= AUDIO_DEVICE_OUT_SPEAKER_SAFE;
            device &= ~AUDIO_DEVICE_OUT_SPEAKER;
        }
        } break;

    default:
        ALOGW("getDeviceForStrategy() unknown strategy: %d", strategy);
        break;
    }

    if (device == AUDIO_DEVICE_NONE) {
        ALOGV("getDeviceForStrategy() no device found for strategy %d", strategy);
        device = getApmObserver()->getDefaultOutputDevice()->type();
        ALOGE_IF(device == AUDIO_DEVICE_NONE,
                 "getDeviceForStrategy() no default device defined");
    }
    ALOGVV("getDeviceForStrategy() strategy %d, device %x", strategy, device);
    return device;
}


audio_devices_t Engine::getDeviceForInputSource(audio_source_t inputSource) const
{
    const DeviceVector availableOutputDevices = getApmObserver()->getAvailableOutputDevices();
    const DeviceVector availableInputDevices = getApmObserver()->getAvailableInputDevices();
    const SwAudioOutputCollection &outputs = getApmObserver()->getOutputs();
    audio_devices_t availableDeviceTypes = availableInputDevices.types() & ~AUDIO_DEVICE_BIT_IN;
    sp<AudioOutputDescriptor> primaryOutput = outputs.getPrimaryOutput();
    audio_devices_t availablePrimaryDeviceTypes = availableInputDevices.getDeviceTypesFromHwModule(
        primaryOutput->getModuleHandle()) & ~AUDIO_DEVICE_BIT_IN;
    uint32_t device = AUDIO_DEVICE_NONE;

    // when a call is active, force device selection to match source VOICE_COMMUNICATION
    // for most other input sources to avoid rerouting call TX audio
    if (isInCall()) {
        switch (inputSource) {
        case AUDIO_SOURCE_DEFAULT:
        case AUDIO_SOURCE_MIC:
        case AUDIO_SOURCE_VOICE_RECOGNITION:
        case AUDIO_SOURCE_UNPROCESSED:
        case AUDIO_SOURCE_HOTWORD:
        case AUDIO_SOURCE_CAMCORDER:
        case AUDIO_SOURCE_VOICE_PERFORMANCE:
            inputSource = AUDIO_SOURCE_VOICE_COMMUNICATION;
            break;
        default:
            break;
        }
    }

    switch (inputSource) {
    case AUDIO_SOURCE_DEFAULT:
    case AUDIO_SOURCE_MIC:
    if (availableDeviceTypes & AUDIO_DEVICE_IN_BLUETOOTH_A2DP) {
        device = AUDIO_DEVICE_IN_BLUETOOTH_A2DP;
    } else if ((getForceUse(AUDIO_POLICY_FORCE_FOR_RECORD) == AUDIO_POLICY_FORCE_BT_SCO) &&
        (availableDeviceTypes & AUDIO_DEVICE_IN_BLUETOOTH_SCO_HEADSET)) {
        device = AUDIO_DEVICE_IN_BLUETOOTH_SCO_HEADSET;
    } else if (availableDeviceTypes & AUDIO_DEVICE_IN_WIRED_HEADSET) {
        device = AUDIO_DEVICE_IN_WIRED_HEADSET;
    } else if (availableDeviceTypes & AUDIO_DEVICE_IN_USB_HEADSET) {
        device = AUDIO_DEVICE_IN_USB_HEADSET;
    } else if (availableDeviceTypes & AUDIO_DEVICE_IN_USB_DEVICE) {
        device = AUDIO_DEVICE_IN_USB_DEVICE;
    } else if (availableDeviceTypes & AUDIO_DEVICE_IN_BUILTIN_MIC) {
        device = AUDIO_DEVICE_IN_BUILTIN_MIC;
    }
    break;

    case AUDIO_SOURCE_VOICE_COMMUNICATION:
        // Allow only use of devices on primary input if in call and HAL does not support routing
        // to voice call path.
        if ((getPhoneState() == AUDIO_MODE_IN_CALL) &&
                (availableOutputDevices.types() & AUDIO_DEVICE_OUT_TELEPHONY_TX) == 0) {
            availableDeviceTypes = availablePrimaryDeviceTypes;
        }

        switch (getForceUse(AUDIO_POLICY_FORCE_FOR_COMMUNICATION)) {
        case AUDIO_POLICY_FORCE_BT_SCO:
            // if SCO device is requested but no SCO device is available, fall back to default case
            if (availableDeviceTypes & AUDIO_DEVICE_IN_BLUETOOTH_SCO_HEADSET) {
                device = AUDIO_DEVICE_IN_BLUETOOTH_SCO_HEADSET;
                break;
            }
            FALLTHROUGH_INTENDED;

        default:    // FORCE_NONE
            if (availableDeviceTypes & AUDIO_DEVICE_IN_WIRED_HEADSET) {
                device = AUDIO_DEVICE_IN_WIRED_HEADSET;
            } else if (availableDeviceTypes & AUDIO_DEVICE_IN_USB_HEADSET) {
                device = AUDIO_DEVICE_IN_USB_HEADSET;
            } else if (availableDeviceTypes & AUDIO_DEVICE_IN_USB_DEVICE) {
                device = AUDIO_DEVICE_IN_USB_DEVICE;
            } else if (availableDeviceTypes & AUDIO_DEVICE_IN_BUILTIN_MIC) {
                device = AUDIO_DEVICE_IN_BUILTIN_MIC;
            }
            break;

        case AUDIO_POLICY_FORCE_SPEAKER:
            if (availableDeviceTypes & AUDIO_DEVICE_IN_BACK_MIC) {
                device = AUDIO_DEVICE_IN_BACK_MIC;
            } else if (availableDeviceTypes & AUDIO_DEVICE_IN_BUILTIN_MIC) {
                device = AUDIO_DEVICE_IN_BUILTIN_MIC;
            }
            break;
        }
        break;

    case AUDIO_SOURCE_VOICE_RECOGNITION:
    case AUDIO_SOURCE_UNPROCESSED:
    case AUDIO_SOURCE_HOTWORD:
        if (inputSource == AUDIO_SOURCE_HOTWORD) {
            availableDeviceTypes = availablePrimaryDeviceTypes;
        }
        if (getForceUse(AUDIO_POLICY_FORCE_FOR_RECORD) == AUDIO_POLICY_FORCE_BT_SCO &&
                availableDeviceTypes & AUDIO_DEVICE_IN_BLUETOOTH_SCO_HEADSET) {
            device = AUDIO_DEVICE_IN_BLUETOOTH_SCO_HEADSET;
        } else if (availableDeviceTypes & AUDIO_DEVICE_IN_WIRED_HEADSET) {
            device = AUDIO_DEVICE_IN_WIRED_HEADSET;
        } else if (availableDeviceTypes & AUDIO_DEVICE_IN_USB_HEADSET) {
            device = AUDIO_DEVICE_IN_USB_HEADSET;
        } else if (availableDeviceTypes & AUDIO_DEVICE_IN_USB_DEVICE) {
            device = AUDIO_DEVICE_IN_USB_DEVICE;
        } else if (availableDeviceTypes & AUDIO_DEVICE_IN_BUILTIN_MIC) {
            device = AUDIO_DEVICE_IN_BUILTIN_MIC;
        }
        break;
    case AUDIO_SOURCE_CAMCORDER:
        if (availableDeviceTypes & AUDIO_DEVICE_IN_BACK_MIC) {
            device = AUDIO_DEVICE_IN_BACK_MIC;
        } else if (availableDeviceTypes & AUDIO_DEVICE_IN_BUILTIN_MIC) {
            device = AUDIO_DEVICE_IN_BUILTIN_MIC;
        } else if (availableDeviceTypes & AUDIO_DEVICE_IN_USB_DEVICE) {
            // This is specifically for a device without built-in mic
            device = AUDIO_DEVICE_IN_USB_DEVICE;
        }
        break;
    case AUDIO_SOURCE_VOICE_DOWNLINK:
    case AUDIO_SOURCE_VOICE_CALL:
    case AUDIO_SOURCE_VOICE_UPLINK:
        if (availableDeviceTypes & AUDIO_DEVICE_IN_VOICE_CALL) {
            device = AUDIO_DEVICE_IN_VOICE_CALL;
        }
        break;
    case AUDIO_SOURCE_VOICE_PERFORMANCE:
        if (availableDeviceTypes & AUDIO_DEVICE_IN_WIRED_HEADSET) {
            device = AUDIO_DEVICE_IN_WIRED_HEADSET;
        } else if (availableDeviceTypes & AUDIO_DEVICE_IN_USB_HEADSET) {
            device = AUDIO_DEVICE_IN_USB_HEADSET;
        } else if (availableDeviceTypes & AUDIO_DEVICE_IN_USB_DEVICE) {
            device = AUDIO_DEVICE_IN_USB_DEVICE;
        } else if (availableDeviceTypes & AUDIO_DEVICE_IN_BUILTIN_MIC) {
            device = AUDIO_DEVICE_IN_BUILTIN_MIC;
        }
        break;
    case AUDIO_SOURCE_REMOTE_SUBMIX:
        if (availableDeviceTypes & AUDIO_DEVICE_IN_REMOTE_SUBMIX) {
            device = AUDIO_DEVICE_IN_REMOTE_SUBMIX;
        }
        break;
    case AUDIO_SOURCE_FM_TUNER:
        if (availableDeviceTypes & AUDIO_DEVICE_IN_FM_TUNER) {
            device = AUDIO_DEVICE_IN_FM_TUNER;
        }
        break;
    case AUDIO_SOURCE_ECHO_REFERENCE:
        if (availableDeviceTypes & AUDIO_DEVICE_IN_ECHO_REFERENCE) {
            device = AUDIO_DEVICE_IN_ECHO_REFERENCE;
        }
        break;
    default:
        ALOGW("getDeviceForInputSource() invalid input source %d", inputSource);
        break;
    }
    if (device == AUDIO_DEVICE_NONE) {
        ALOGV("getDeviceForInputSource() no device found for source %d", inputSource);
        if (availableDeviceTypes & AUDIO_DEVICE_IN_STUB) {
            device = AUDIO_DEVICE_IN_STUB;
        }
        ALOGE_IF(device == AUDIO_DEVICE_NONE,
                 "getDeviceForInputSource() no default device defined");
    }
    ALOGV("getDeviceForInputSource()input source %d, device %08x", inputSource, device);
    return device;
}

void Engine::updateDeviceSelectionCache()
{
    for (const auto &iter : getProductStrategies()) {
        const auto &strategy = iter.second;
        auto devices = getDevicesForProductStrategy(strategy->getId());
        mDevicesForStrategies[strategy->getId()] = devices;
        strategy->setDeviceTypes(devices.types());
        strategy->setDeviceAddress(devices.getFirstValidAddress().c_str());
    }
}

DeviceVector Engine::getDevicesForProductStrategy(product_strategy_t strategy) const
{
    DeviceVector availableOutputDevices = getApmObserver()->getAvailableOutputDevices();
    DeviceVector availableInputDevices = getApmObserver()->getAvailableInputDevices();
    const SwAudioOutputCollection &outputs = getApmObserver()->getOutputs();

    auto legacyStrategy = mLegacyStrategyMap.find(strategy) != end(mLegacyStrategyMap) ?
                mLegacyStrategyMap.at(strategy) : STRATEGY_NONE;
    audio_devices_t devices = getDeviceForStrategyInt(legacyStrategy,
                                                      availableOutputDevices,
                                                      availableInputDevices, outputs,
                                                      (uint32_t)AUDIO_DEVICE_NONE);
    return availableOutputDevices.getDevicesFromTypeMask(devices);
}

DeviceVector Engine::getOutputDevicesForAttributes(const audio_attributes_t &attributes,
                                                   const sp<DeviceDescriptor> &preferredDevice,
                                                   bool fromCache) const
{
    // First check for explict routing device
    if (preferredDevice != nullptr) {
        ALOGV("%s explicit Routing on device %s", __func__, preferredDevice->toString().c_str());
        return DeviceVector(preferredDevice);
    }
    product_strategy_t strategy = getProductStrategyForAttributes(attributes);
    const DeviceVector availableOutputDevices = getApmObserver()->getAvailableOutputDevices();
    const SwAudioOutputCollection &outputs = getApmObserver()->getOutputs();
    //
    // @TODO: what is the priority of explicit routing? Shall it be considered first as it used to
    // be by APM?
    //
    // Honor explicit routing requests only if all active clients have a preferred route in which
    // case the last active client route is used
    sp<DeviceDescriptor> device = findPreferredDevice(outputs, strategy, availableOutputDevices);
    if (device != nullptr) {
        return DeviceVector(device);
    }

    return fromCache? mDevicesForStrategies.at(strategy) : getDevicesForProductStrategy(strategy);
}

DeviceVector Engine::getOutputDevicesForStream(audio_stream_type_t stream, bool fromCache) const
{
    auto attributes = getAttributesForStreamType(stream);
    return getOutputDevicesForAttributes(attributes, nullptr, fromCache);
}

sp<DeviceDescriptor> Engine::getInputDeviceForAttributes(const audio_attributes_t &attr,
                                                         sp<AudioPolicyMix> *mix) const
{
    const auto &policyMixes = getApmObserver()->getAudioPolicyMixCollection();
    const auto availableInputDevices = getApmObserver()->getAvailableInputDevices();
    const auto &inputs = getApmObserver()->getInputs();
    std::string address;

    //
    // Explicit Routing ??? what is the priority of explicit routing? Shall it be considered
    // first as it used to be by APM?
    //
    // Honor explicit routing requests only if all active clients have a preferred route in which
    // case the last active client route is used
    sp<DeviceDescriptor> device =
            findPreferredDevice(inputs, attr.source, availableInputDevices);
    if (device != nullptr) {
        return device;
    }

    device = policyMixes.getDeviceAndMixForInputSource(attr.source, availableInputDevices, mix);
    if (device != nullptr) {
        return device;
    }
    audio_devices_t deviceType = getDeviceForInputSource(attr.source);

    if (audio_is_remote_submix_device(deviceType)) {
        address = "0";
        std::size_t pos;
        std::string tags { attr.tags };
        if ((pos = tags.find("addr=")) != std::string::npos) {
            address = tags.substr(pos + std::strlen("addr="));
        }
    }
    return availableInputDevices.getDevice(deviceType,
                                           String8(address.c_str()),
                                           AUDIO_FORMAT_DEFAULT);
}

} // namespace audio_policy
} // namespace android