Method prepareOutput

Server/Source/ScreenRecorder.cpp:388–518

}

bool ScreenRecorder::prepareOutput() {
    traceScope();

    if (nullptr == m_captureCodecCtx) {
        logError("prepareOutput: input not ready");
        return false;
    }

    m_capturePacket = av_packet_alloc();
    if (nullptr == m_capturePacket) {
        logError("prepareOutput: unable to allocate AVPacket");
        return false;
    }

    m_captureFrame = av_frame_alloc();
    if (nullptr == m_captureFrame) {
        logError("prepareOutput: unable to allocate AVFrame");
        return false;
    }

    m_outputPacket = av_packet_alloc();
    if (nullptr == m_outputPacket) {
        logError("prepareOutput: unable to allocate AVPacket");
        return false;
    }

    if (nullptr != m_outputCodecCtx && avcodec_is_open(m_outputCodecCtx)) {
        avcodec_close(m_outputCodecCtx);
    } else {
        m_outputCodecCtx = avcodec_alloc_context3(m_outputCodec);
        if (nullptr == m_outputCodecCtx) {
            logError("prepareOutput: unable to allocate codec context");
            return false;
        }
    }

    m_scaledWith = m_downScale ? (int)(m_captureRect.getWidth() / m_scale) : m_captureRect.getWidth();
    m_scaledHeight = m_downScale ? (int)(m_captureRect.getHeight() / m_scale) : m_captureRect.getHeight();

    m_outputCodecCtx->pix_fmt = m_encMode == MJPEG ? AV_PIX_FMT_YUVJ420P : AV_PIX_FMT_YUV420P;
    m_outputCodecCtx->time_base.num = 1;
    m_outputCodecCtx->time_base.den = 30;
    m_outputCodecCtx->width = m_scaledWith;
    m_outputCodecCtx->height = m_scaledHeight;

    // avcodec_align_dimensions(m_outputCodecCtx, &m_outputCodecCtx->width, &m_outputCodecCtx->height);

    logln("prepareOutput: setting output codec context dimensions to "
          << m_outputCodecCtx->width << "x" << m_outputCodecCtx->height << " (unalligned " << m_scaledWith << "x"
          << m_scaledHeight << ")");

    AVDictionary* opts = nullptr;
    switch (m_encMode) {
        case WEBP:
            av_dict_set(&opts, "preset", "none", 0);
            av_dict_set(&opts, "compression_level", "1", 0);
            av_dict_set(&opts, "global_quality", String(m_quality).getCharPointer(), 0);
            break;