xref: /frameworks/av/media/libstagefright/wifi-display/source/RepeaterSource.cpp

//#define LOG_NDEBUG 0
#define LOG_TAG "RepeaterSource"
#include <utils/Log.h>

#include "RepeaterSource.h"

#include <media/stagefright/foundation/ADebug.h>
#include <media/stagefright/foundation/ALooper.h>
#include <media/stagefright/foundation/AMessage.h>
#include <media/stagefright/MediaBuffer.h>
#include <media/stagefright/MetaData.h>

namespace android {

RepeaterSource::RepeaterSource(const sp<MediaSource> &source, double rateHz)
    : mSource(source),
      mRateHz(rateHz),
      mBuffer(NULL),
      mResult(OK),
      mStartTimeUs(-1ll),
      mFrameCount(0) {
}

RepeaterSource::~RepeaterSource() {
    stop();
}

status_t RepeaterSource::start(MetaData *params) {
    status_t err = mSource->start(params);

    if (err != OK) {
        return err;
    }

    mBuffer = NULL;
    mResult = OK;
    mStartTimeUs = -1ll;
    mFrameCount = 0;

    mLooper = new ALooper;
    mLooper->setName("repeater_looper");
    mLooper->start();

    mReflector = new AHandlerReflector<RepeaterSource>(this);
    mLooper->registerHandler(mReflector);

    postRead();

    return OK;
}

status_t RepeaterSource::stop() {
    if (mLooper != NULL) {
        mLooper->stop();
        mLooper.clear();

        mReflector.clear();
    }

    return mSource->stop();
}

sp<MetaData> RepeaterSource::getFormat() {
    return mSource->getFormat();
}

status_t RepeaterSource::read(
        MediaBuffer **buffer, const ReadOptions *options) {
    int64_t seekTimeUs;
    ReadOptions::SeekMode seekMode;
    CHECK(options == NULL || !options->getSeekTo(&seekTimeUs, &seekMode));

    int64_t bufferTimeUs = -1ll;

    if (mStartTimeUs < 0ll) {
        Mutex::Autolock autoLock(mLock);
        while (mBuffer == NULL && mResult == OK) {
            mCondition.wait(mLock);
        }

        mStartTimeUs = ALooper::GetNowUs();
        bufferTimeUs = mStartTimeUs;
    } else {
        bufferTimeUs = mStartTimeUs + (mFrameCount * 1000000ll) / mRateHz;

        int64_t nowUs = ALooper::GetNowUs();
        int64_t delayUs = bufferTimeUs - nowUs;

        if (delayUs > 0ll) {
            usleep(delayUs);
        }
    }

    Mutex::Autolock autoLock(mLock);
    if (mResult != OK) {
        CHECK(mBuffer == NULL);
        return mResult;
    }

    mBuffer->add_ref();
    *buffer = mBuffer;
    (*buffer)->meta_data()->setInt64(kKeyTime, bufferTimeUs);

    ++mFrameCount;

    return OK;
}

void RepeaterSource::postRead() {
    (new AMessage(kWhatRead, mReflector->id()))->post();
}

void RepeaterSource::onMessageReceived(const sp<AMessage> &msg) {
    switch (msg->what()) {
        case kWhatRead:
        {
            MediaBuffer *buffer;
            status_t err = mSource->read(&buffer);

            Mutex::Autolock autoLock(mLock);
            if (mBuffer != NULL) {
                mBuffer->release();
                mBuffer = NULL;
            }
            mBuffer = buffer;
            mResult = err;

            mCondition.broadcast();

            if (err == OK) {
                postRead();
            }
            break;
        }

        default:
            TRESPASS();
    }
}

}  // namespace android