Function decode_frame

libavcodec/dpx.c:280–803

}

static int decode_frame(AVCodecContext *avctx, AVFrame *p,
                        int *got_frame, AVPacket *avpkt)
{
    DPXDecContext *dpx = avctx->priv_data;

    enum AVPixelFormat pix_fmt;
    const uint8_t *buf = avpkt->data;
    int buf_size       = avpkt->size;
    uint32_t header_version, version = 0;
    char creator[101] = { 0 };
    char input_device[33] = { 0 };

    unsigned int offset;
    int magic_num;
    int i, j, ret;
    int w, h, descriptor;
    int yuv, color_trc, color_spec;
    int encoding;

    if (avpkt->size <= 1634) {
        av_log(avctx, AV_LOG_ERROR, "Packet too small for DPX header\n");
        return AVERROR_INVALIDDATA;
    }

    magic_num = AV_RB32(buf);
    buf += 4;

    /* Check if the files "magic number" is "SDPX" which means it uses
     * big-endian or XPDS which is for little-endian files */
    if (magic_num == AV_RL32("SDPX")) {
        dpx->endian = 0;
    } else if (magic_num == AV_RB32("SDPX")) {
        dpx->endian = 1;
    } else {
        av_log(avctx, AV_LOG_ERROR, "DPX marker not found\n");
        return AVERROR_INVALIDDATA;
    }

    offset = read32(&buf, dpx->endian);
    if (avpkt->size <= offset) {
        av_log(avctx, AV_LOG_ERROR, "Invalid data start offset\n");
        return AVERROR_INVALIDDATA;
    }

    header_version = read32(&buf, 0);
    if (header_version == MKTAG('V','1','.','0'))
        version = 1;
    if (header_version == MKTAG('V','2','.','0'))
        version = 2;
    if (!version)
        av_log(avctx, AV_LOG_WARNING, "Unknown header format version %s.\n",
               av_fourcc2str(header_version));

    // Check encryption
    buf = avpkt->data + 660;
    ret = read32(&buf, dpx->endian);
    if (ret != 0xFFFFFFFF) {
        avpriv_report_missing_feature(avctx, "Encryption");