Method initCodec

Plugin/Source/ImageReader.cpp:97–164

}

bool ImageReader::initCodec() {
    traceScope();

    av_log_set_level(AV_LOG_QUIET);

    m_inputCodec = avcodec_find_decoder_by_name("webp");
    if (nullptr == m_inputCodec) {
        logln("unable to find webp codec");
        return false;
    }

    m_inputPacket = av_packet_alloc();
    if (nullptr == m_inputPacket) {
        logln("unable to allocate AVPacket");
        return false;
    }

    m_inputFrame = av_frame_alloc();
    if (nullptr == m_inputFrame) {
        logln("unable to allocate AVFrame");
        return false;
    }

    m_inputCodecCtx = avcodec_alloc_context3(m_inputCodec);
    if (nullptr == m_inputCodecCtx) {
        logln("unable to allocate codec context");
        return false;
    }

    m_inputCodecCtx->pix_fmt = AV_PIX_FMT_YUV420P;
    m_inputCodecCtx->time_base.num = 1;
    m_inputCodecCtx->time_base.den = 20;
    m_inputCodecCtx->width = m_widthPadded;
    m_inputCodecCtx->height = m_heightPadded;

    logln("setting input codec context dimensions to " << m_inputCodecCtx->width << "x" << m_inputCodecCtx->height);

    int ret = avcodec_open2(m_inputCodecCtx, m_inputCodec, nullptr);
    if (ret < 0) {
        logln("avcodec_open2 failed: " << ret);
        return false;
    }

    m_outputFrame = av_frame_alloc();
    if (nullptr == m_outputFrame) {
        logln("unable to allocate AVFrame");
        return false;
    }

    auto fmt = AV_PIX_FMT_RGB32;
    m_outputFrame->width = m_width;
    m_outputFrame->height = m_height;
    m_outputFrame->format = fmt;

    m_outputFrameBuf =
        (uint8_t*)av_malloc((size_t)av_image_get_buffer_size(fmt, m_outputFrame->width, m_outputFrame->height, 1) +
                            AV_INPUT_BUFFER_PADDING_SIZE);