Qt音视频开发12-easyplayer内核

## 一、前言

在视频监控行业经常看到两个厂家广告打得比较厉害，一个是青犀视频对应easyplayer，一个是大牛直播，两个最初都是sdk免费，并提供调用示例源码，后面大牛直播的sdk以及示例都无法运行，目前就剩下免费的easyplayer可以用，亲测下来确实免费可用不需要授权秘钥之类的，功能还行，支持各种音视频文件、本地摄像头、网络视频流等，就是在录制H265视频的时候不行，直接崩溃，估计官方放出的版本不支持，内部的版本肯定是支持的。

easyplayer的设计总体上估计参照了mpv播放器的设计，所有属性做成了可读取和设置，通过调用EasyPlayerPro_Setparam设置属性，调用EasyPlayerPro_Getparam获取属性，参数传入对应枚举值EASY_PARAM_ID即可，至于有哪些参数可以通过头文件枚举值查看，所有的参数可读取，不是所有的参数可设置。这种设计很巧妙和万能通用，不少优秀的库也都参照这种设计思路，这样后期增加功能只需要增加对应的枚举值即可。比如获取倍速调用 EasyPlayerPro_Getparam(easyPlayer, EASY_PARAM_PLAY_SPEED, &speed); 设置倍速调用 EasyPlayerPro_Setparam(easyPlayer, EASY_PARAM_PLAY_SPEED, &value); 看起来是不是很简洁通俗易懂。

## 二、效果图

#include "easyplayerthread.h"
#include "videohelper.h"

EasyPlayerThread::EasyPlayerThread(QObject *parent) : VideoThread(parent)
{
    easyPlayer = NULL;
}

void EasyPlayerThread::setGeometry()
{
    if (!easyPlayer) {
        return;
    }

    //设置波形频谱可视化效果
    int mode = 2;
    EasyPlayerPro_Setparam(easyPlayer, EASY_PARAM_VISUAL_EFFECT, &mode);
    //获取视频流编号
    int videoId = -1;
    EasyPlayerPro_Getparam(easyPlayer, EASY_PARAM_VIDEO_STREAM_CUR, &videoId);
    //获取音频流编号
    int audioId = -1;
    EasyPlayerPro_Getparam(easyPlayer, EASY_PARAM_AUDIO_STREAM_CUR, &audioId);

    int width = hwndWidget->width();
    int height = hwndWidget->height();
    EasyPlayerPro_Getparam(easyPlayer, EASY_PARAM_VISUAL_EFFECT, &mode);
    QString text = "空白";
    if (mode == 1) {
        text = "波形";
    } else if (mode == 2) {
        text = "频谱";
    }
    debug("设置信息", QString("效果: %1 视频: %2 音频: %3").arg(text).arg(videoId).arg(audioId));

    //设置了不显示可视化效果/无视频/无音频则不显示波形频谱
    if (mode == EASY_AUDIO_VISUAL_EFFECT_DISABLE || videoId < 0 || audioId < 0) {
        EasyPlayerPro_Resize(easyPlayer, 0, 0, 0, width, height);
        EasyPlayerPro_Resize(easyPlayer, 1, 0, 0, width, height);
    } else {
        int percent = 10;
        EasyPlayerPro_Resize(easyPlayer, 0, 0, 0, width, height * (percent - 1) / percent);
        EasyPlayerPro_Resize(easyPlayer, 1, 0, height * (percent - 1) / percent, width, height / percent);
    }
}

bool EasyPlayerThread::openVideo()
{
    //先检查地址是否正常(文件是否存在或者网络地址是否可达)
    if (!VideoHelper::checkUrl(this, videoType, videoUrl, connectTimeout)) {
        return false;
    }

    //启动计时
    timer.start();
    //安装事件过滤器识别尺寸变化
    if (videoMode == VideoMode_Hwnd) {
        hwndWidget->installEventFilter(this);
    }

    //创建实例
    if (!easyPlayer) {
        easyPlayer = EasyPlayerPro_Create();
    }

    //创建失败则返回
    if (!easyPlayer) {
        return false;
    }

    //准备参数
    QByteArray urlData = VideoHelper::getRightUrl(videoType, videoUrl).toUtf8();
    char *url = urlData.data();
    HWND wid = (HWND)hwndWidget->winId();
    EASY_STREAM_LINK_MODE linkMode = (transport == "tcp" ? EASY_STREAM_LINK_TCP : EASY_STREAM_LINK_UDP);

    //通过句柄的方式设置播放
#ifdef easyplayerx
    easyPlayer = EasyPlayerPro_Open(easyPlayer, url, wid, EASY_VIDEO_RENDER_TYPE_GDI, EASY_VIDEO_MODE_STRETCHED, linkMode, 100, 0);
#else
    QString key = "EasyPlayer is Fr1ee!";
    int ret = EasyPlayerPro_Authorize(key.toUtf8().data());
    debug("剩余天数", QString("天数: %1").arg(ret));
    int param = 1;
    EasyPlayerPro_Setparam(easyPlayer, EASY_PARAM_VDEV_RENDER_SHOW, ¶m);
    easyPlayer = EasyPlayerPro_Open(easyPlayer, url, wid, EASY_VIDEO_RENDER_TYPE_GDI, EASY_VIDEO_MODE_STRETCHED, linkMode, 100, 0, 1024 * 1024, 10000000);
#endif

    isOk = true;
    emit recorderStateChanged(RecorderState_Stopped, fileName);
    lastTime = QDateTime::currentDateTime();
    int time = timer.elapsed();
    debug("打开成功", QString("用时: %1 毫秒").arg(time));
    //只有获取到了宽高信息才算真正打开完成
    //emit receivePlayStart(time);
    return isOk;
}

void EasyPlayerThread::closeVideo()
{
    //先停止录制
    recordStop();
    //搞个标志位判断是否需要调用父类的释放(可以防止重复调用)
    bool needClose = (easyPlayer);

    //释放对象
    if (easyPlayer) {
        EasyPlayerPro_Close(easyPlayer);
        EasyPlayerPro_Release(easyPlayer);
        easyPlayer = NULL;
    }

    if (needClose) {
        VideoThread::closeVideo();
    }
}

void EasyPlayerThread::readMediaInfo()
{
    if (!easyPlayer) {
        return;
    }

#if 0
    EasyPlayerPro_Getparam(easyPlayer, EASY_PARAM_VIDEO_WIDTH, &videoWidth);
    EasyPlayerPro_Getparam(easyPlayer, EASY_PARAM_VIDEO_HEIGHT, &videoHeight);
    EasyPlayerPro_Getparam(easyPlayer, EASY_PARAM_VDEV_FRAME_RATE, &frameRate);
#else
    MediaInfo mediaInfo;
    memset(&mediaInfo, 0x00, sizeof(MediaInfo));
    EasyPlayerPro_Getparam(easyPlayer, EASY_PARAM_MEDIA_INFO, &mediaInfo);
    videoWidth = mediaInfo.nWidth;
    videoHeight = mediaInfo.nHeight;
    frameRate = mediaInfo.nFrameRate;
#endif

    //纯音频则取父窗体的尺寸
    if (onlyAudio) {
        QWidget *widget = (QWidget *)hwndWidget->parent();
        videoWidth = widget->width();
        videoHeight = widget->height();
    }

    if (videoWidth > 0 && videoHeight > 0) {
        emit receivePlayStart(timer.elapsed());
        QString msg = QString("宽高: %1x%2 帧率: %3 角度: %4").arg(videoWidth).arg(videoHeight).arg(frameRate).arg(rotate);
        debug("媒体信息", msg);

        this->setGeometry();
        emit receiveVolume(getVolume());
    }
}

qint64 EasyPlayerThread::getDuration()
{
    //没有获取过才需要获取
    if (easyPlayer && duration == 0 && getIsFile()) {
        EasyPlayerPro_Getparam(easyPlayer, EASY_PARAM_MEDIA_DURATION, &duration);
        emit receiveDuration(duration);
    }
    return duration;
}

qint64 EasyPlayerThread::getPosition()
{
    qint64 position = 0;
    if (easyPlayer) {
        this->getDuration();
        lastTime = QDateTime::currentDateTime();
        EasyPlayerPro_Getparam(easyPlayer, EASY_PARAM_MEDIA_POSITION, &position);
        emit receivePosition(position);

        //如果设置了重复循环播放则快到了文件末尾重新设置位置即可
        int offset = duration - position;
        if (duration > 0 && offset < 500) {
            if (this->getPlayRepeat()) {
                QMetaObject::invokeMethod(this, "setPosition", Q_ARG(qint64, 0));
            } else {
                this->stop2();
            }
        }
    }
    return position;
}

void EasyPlayerThread::setPosition(qint64 position)
{
    //文件才能指定播放位置(保存文件阶段不允许切换进度否则录制的文件错乱)
    if (easyPlayer && getIsFile() && !isRecord) {
        EasyPlayerPro_Seek(easyPlayer, position);
    }
}

double EasyPlayerThread::getSpeed()
{
    double speed = 1.0;
    if (easyPlayer) {
        EasyPlayerPro_Getparam(easyPlayer, EASY_PARAM_PLAY_SPEED, &speed);
        speed = speed / 100;
    }
    return speed;
}

void EasyPlayerThread::setSpeed(double speed)
{
    //文件才能指定播放速度
    if (easyPlayer && getIsFile()) {
        int value = speed * 100;
        EasyPlayerPro_Setparam(easyPlayer, EASY_PARAM_PLAY_SPEED, &value);
    }
}

int EasyPlayerThread::getVolume()
{
    //声音范围是[-182, 73] 需要转换成[0, 100]
    int volume = 0;
    if (easyPlayer) {
        EasyPlayerPro_Getparam(easyPlayer, EASY_PARAM_AUDIO_VOLUME, &volume);
        volume = VideoHelper::getRangeValue(-182, 73, volume, 0, 100);
    }
    return volume;
}

void EasyPlayerThread::setVolume(int volume)
{
    emit receiveVolume(volume);
    if (easyPlayer) {
        volume = VideoHelper::getRangeValue(0, 100, volume, -182, 73);
        EasyPlayerPro_Setparam(easyPlayer, EASY_PARAM_AUDIO_VOLUME, &volume);
    }
}

bool EasyPlayerThread::getMuted()
{
    int muted = 0;
    if (easyPlayer) {
        EasyPlayerPro_Getparam(easyPlayer, EASY_PARAM_ADEV_MUTE, &muted);
    }
    return (muted == 1);
}

void EasyPlayerThread::setMuted(bool muted)
{
    emit receiveMuted(muted);
    if (easyPlayer) {
        int value = muted ? 1 : 0;
        EasyPlayerPro_Setparam(easyPlayer, EASY_PARAM_ADEV_MUTE, &value);
    }
}

void EasyPlayerThread::pause()
{
    if (easyPlayer && !isPause) {
        isPause = true;
        EasyPlayerPro_Pause(easyPlayer);
    }
}

void EasyPlayerThread::next()
{
    if (easyPlayer && isPause) {
        isPause = false;
        EasyPlayerPro_Play(easyPlayer);
    }
}

void EasyPlayerThread::snap(const QString &snapName)
{
    this->setSnapName(snapName);
    if (easyPlayer) {
        int result = EasyPlayerPro_Snapshot(easyPlayer, snapName.toUtf8().data(), 0, 0, 200);
        if (result >= 0) {
            QMetaObject::invokeMethod(this, "snapFinsh");
        }
    }
}

void EasyPlayerThread::recordStart(const QString &fileName)
{
    this->setFileName(fileName);
    if (easyPlayer && !isRecord) {
        int result = EasyPlayerPro_Record(easyPlayer, fileName.toUtf8().data(), 0);
        if (result >= 0) {
            isRecord = true;
            emit recorderStateChanged(RecorderState_Recording, fileName);
            debug("开始录制", QString("文件: %1").arg(fileName));
        }
    }
}

void EasyPlayerThread::recordStop()
{
    if (easyPlayer && isRecord) {
        int result = EasyPlayerPro_Stoprecord(easyPlayer);
        if (result >= 0) {
            isRecord = false;
            emit recorderStateChanged(RecorderState_Stopped, fileName);
            debug("结束录制", QString("文件: %1").arg(fileName));
        }
    }
}