hardware_interfaces/broadcastradio/2.0/default/TunerSession.cpp

/*
 * Copyright (C) 2017 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 "BcRadioDef.tuner"
#define LOG_NDEBUG 0

#include "TunerSession.h"

#include "BroadcastRadio.h"

#include <broadcastradio-utils-2x/Utils.h>
#include <log/log.h>

namespace android {
namespace hardware {
namespace broadcastradio {
namespace V2_0 {
namespace implementation {

using namespace std::chrono_literals;

using utils::tunesTo;

using std::lock_guard;
using std::move;
using std::mutex;
using std::sort;
using std::vector;

namespace delay {

static constexpr auto scan = 200ms;
static constexpr auto step = 100ms;
static constexpr auto tune = 150ms;

}  // namespace delay

TunerSession::TunerSession(BroadcastRadio& module, const sp<ITunerCallback>& callback)
    : mCallback(callback), mModule(module) {}

// makes ProgramInfo that points to no program
static ProgramInfo makeDummyProgramInfo(const ProgramSelector& selector) {
    ProgramInfo info = {};
    info.selector = selector;
    return info;
}

void TunerSession::tuneInternalLocked(const ProgramSelector& sel) {
    VirtualProgram virtualProgram;
    ProgramInfo programInfo;
    if (virtualRadio().getProgram(sel, virtualProgram)) {
        mCurrentProgram = virtualProgram.selector;
        programInfo = virtualProgram;
    } else {
        mCurrentProgram = sel;
        programInfo = makeDummyProgramInfo(sel);
    }
    mIsTuneCompleted = true;

    mCallback->onCurrentProgramInfoChanged(programInfo);
}

const VirtualRadio& TunerSession::virtualRadio() const {
    return mModule.get().mVirtualRadio;
}

Return<Result> TunerSession::tune(const ProgramSelector& sel) {
    ALOGV("%s(%s)", __func__, toString(sel).c_str());
    lock_guard<mutex> lk(mMut);
    if (mIsClosed) return Result::INVALID_STATE;

    if (!utils::isSupported(mModule.get().mProperties, sel)) {
        ALOGW("Selector not supported");
        return Result::NOT_SUPPORTED;
    }

    if (!utils::isValid(sel)) {
        ALOGE("ProgramSelector is not valid");
        return Result::INVALID_ARGUMENTS;
    }

    mIsTuneCompleted = false;
    auto task = [this, sel]() {
        lock_guard<mutex> lk(mMut);
        tuneInternalLocked(sel);
    };
    mThread.schedule(task, delay::tune);

    return Result::OK;
}

Return<Result> TunerSession::scan(bool directionUp, bool /* skipSubChannel */) {
    ALOGV("%s", __func__);
    lock_guard<mutex> lk(mMut);
    if (mIsClosed) return Result::INVALID_STATE;

    auto list = virtualRadio().getProgramList();

    if (list.empty()) {
        mIsTuneCompleted = false;
        auto task = [this, directionUp]() {
            ALOGI("Performing failed scan up=%d", directionUp);

            mCallback->onTuneFailed(Result::TIMEOUT, {});
        };
        mThread.schedule(task, delay::scan);

        return Result::OK;
    }

    // Not optimal (O(sort) instead of O(n)), but not a big deal here;
    // also, it's likely that list is already sorted (so O(n) anyway).
    sort(list.begin(), list.end());
    auto current = mCurrentProgram;
    auto found = lower_bound(list.begin(), list.end(), VirtualProgram({current}));
    if (directionUp) {
        if (found < list.end() - 1) {
            if (tunesTo(current, found->selector)) found++;
        } else {
            found = list.begin();
        }
    } else {
        if (found > list.begin() && found != list.end()) {
            found--;
        } else {
            found = list.end() - 1;
        }
    }
    auto tuneTo = found->selector;

    mIsTuneCompleted = false;
    auto task = [this, tuneTo, directionUp]() {
        ALOGI("Performing scan up=%d", directionUp);

        lock_guard<mutex> lk(mMut);
        tuneInternalLocked(tuneTo);
    };
    mThread.schedule(task, delay::scan);

    return Result::OK;
}

Return<Result> TunerSession::step(bool directionUp) {
    ALOGV("%s", __func__);
    lock_guard<mutex> lk(mMut);
    if (mIsClosed) return Result::INVALID_STATE;

    if (!utils::hasId(mCurrentProgram, IdentifierType::AMFM_FREQUENCY)) {
        ALOGE("Can't step in anything else than AM/FM");
        return Result::NOT_SUPPORTED;
    }

    mIsTuneCompleted = false;

    auto stepTo = utils::getId(mCurrentProgram, IdentifierType::AMFM_FREQUENCY);
#if 0
    // TODO(b/69958423): handle regions
    if (directionUp) {
        stepTo += mAmfmConfig.spacings[0];
    } else {
        stepTo -= mAmfmConfig.spacings[0];
    }

    if (stepTo > mAmfmConfig.upperLimit) stepTo = mAmfmConfig.lowerLimit;
    if (stepTo < mAmfmConfig.lowerLimit) stepTo = mAmfmConfig.upperLimit;
#else
    if (directionUp) {
        stepTo += 100;
    } else {
        stepTo -= 100;
    }
#endif

    auto task = [this, stepTo]() {
        ALOGI("Performing step to %s", std::to_string(stepTo).c_str());

        lock_guard<mutex> lk(mMut);

        tuneInternalLocked(utils::make_selector_amfm(stepTo));
    };
    mThread.schedule(task, delay::step);

    return Result::OK;
}

Return<void> TunerSession::cancel() {
    ALOGV("%s", __func__);
    lock_guard<mutex> lk(mMut);
    if (mIsClosed) return {};

    mThread.cancelAll();
    return {};
}

Return<void> TunerSession::getConfigFlag(ConfigFlag flag, getConfigFlag_cb _hidl_cb) {
    ALOGV("%s(%s)", __func__, toString(flag).c_str());

    _hidl_cb(Result::NOT_SUPPORTED, false);
    return {};
}

Return<Result> TunerSession::setConfigFlag(ConfigFlag flag, bool value) {
    ALOGV("%s(%s, %d)", __func__, toString(flag).c_str(), value);

    return Result::NOT_SUPPORTED;
}

Return<void> TunerSession::setParameters(const hidl_vec<VendorKeyValue>& /* parameters */,
                                         setParameters_cb _hidl_cb) {
    ALOGV("%s", __func__);

    _hidl_cb({});
    return {};
}

Return<void> TunerSession::getParameters(const hidl_vec<hidl_string>& /* keys */,
                                         getParameters_cb _hidl_cb) {
    ALOGV("%s", __func__);

    _hidl_cb({});
    return {};
}

Return<void> TunerSession::close() {
    ALOGV("%s", __func__);
    lock_guard<mutex> lk(mMut);
    if (mIsClosed) return {};

    mIsClosed = true;
    mThread.cancelAll();
    return {};
}

}  // namespace implementation
}  // namespace V2_0
}  // namespace broadcastradio
}  // namespace hardware
}  // namespace android