static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
                        AVPacket *avpkt)
{
    AVFrame *pic = data;
    const uint8_t *src = avpkt->data;
    int ret;

    if (avpkt->size < 16) {
        av_log(avctx, AV_LOG_ERROR, "packet too small\n");
        return AVERROR_INVALIDDATA;
    }

    switch (AV_RB32(src)) {
    case 0x01000001:
        ret = dxtory_decode_v1_rgb(avctx, pic, src + 16, avpkt->size - 16,
                                   AV_PIX_FMT_BGR24, 3);
        break;
    case 0x01000009:
        ret = dxtory_decode_v2_rgb(avctx, pic, src + 16, avpkt->size - 16);
        break;
    case 0x02000001:
        ret = dxtory_decode_v1_420(avctx, pic, src + 16, avpkt->size - 16);
        break;
    case 0x02000009:
        ret = dxtory_decode_v2_420(avctx, pic, src + 16, avpkt->size - 16);
        break;
    case 0x03000001:
        ret = dxtory_decode_v1_410(avctx, pic, src + 16, avpkt->size - 16);
        break;
    case 0x03000009:
        ret = dxtory_decode_v2_410(avctx, pic, src + 16, avpkt->size - 16);
        break;
    case 0x04000001:
        ret = dxtory_decode_v1_444(avctx, pic, src + 16, avpkt->size - 16);
        break;
    case 0x04000009:
        ret = dxtory_decode_v2_444(avctx, pic, src + 16, avpkt->size - 16);
        break;
    case 0x17000001:
        ret = dxtory_decode_v1_rgb(avctx, pic, src + 16, avpkt->size - 16,
                                   AV_PIX_FMT_RGB565LE, 2);
        break;
    case 0x17000009:
        ret = dxtory_decode_v2_565(avctx, pic, src + 16, avpkt->size - 16, 1);
        break;
    case 0x18000001:
    case 0x19000001:
        ret = dxtory_decode_v1_rgb(avctx, pic, src + 16, avpkt->size - 16,
                                   AV_PIX_FMT_RGB555LE, 2);
        break;
    case 0x18000009:
    case 0x19000009:
        ret = dxtory_decode_v2_565(avctx, pic, src + 16, avpkt->size - 16, 0);
        break;
    default:
        avpriv_request_sample(avctx, "Frame header %X", AV_RB32(src));
        return AVERROR_PATCHWELCOME;
    }

    if (ret)
        return ret;

    pic->pict_type = AV_PICTURE_TYPE_I;
    pic->key_frame = 1;
    *got_frame = 1;

    return avpkt->size;
}
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
                        AVPacket *avpkt)
{
    AVFrame *pic = data;
    const uint8_t *src = avpkt->data;
    int ret;

    if (avpkt->size < 16) {
        av_log(avctx, AV_LOG_ERROR, "packet too small\n");
        return AVERROR_INVALIDDATA;
    }

    switch (AV_RB32(src)) {
    case 0x01000001:
        ret = dxtory_decode_v1_rgb(avctx, pic, src + 16, avpkt->size - 16,
                                   AV_PIX_FMT_BGR24, 3);
        break;
    case 0x01000009:
        ret = dxtory_decode_v2_rgb(avctx, pic, src + 16, avpkt->size - 16);
        break;
    case 0x02000001:
        ret = dxtory_decode_v1_420(avctx, pic, src + 16, avpkt->size - 16);
        break;
    case 0x02000009:
        ret = dxtory_decode_v2_420(avctx, pic, src + 16, avpkt->size - 16);
        break;
    case 0x03000001:
        ret = dxtory_decode_v1_410(avctx, pic, src + 16, avpkt->size - 16);
        break;
    case 0x03000009:
        ret = dxtory_decode_v2_410(avctx, pic, src + 16, avpkt->size - 16);
        break;
    case 0x04000001:
        ret = dxtory_decode_v1_444(avctx, pic, src + 16, avpkt->size - 16);
        break;
    case 0x04000009:
        ret = dxtory_decode_v2_444(avctx, pic, src + 16, avpkt->size - 16);
        break;
    case 0x17000001:
        ret = dxtory_decode_v1_rgb(avctx, pic, src + 16, avpkt->size - 16,
                                   AV_PIX_FMT_RGB565LE, 2);
        break;
    case 0x17000009:
        ret = dxtory_decode_v2_565(avctx, pic, src + 16, avpkt->size - 16, 1);
        break;
    case 0x18000001:
    case 0x19000001:
        ret = dxtory_decode_v1_rgb(avctx, pic, src + 16, avpkt->size - 16,
                                   AV_PIX_FMT_RGB555LE, 2);
        break;
    case 0x18000009:
    case 0x19000009:
        ret = dxtory_decode_v2_565(avctx, pic, src + 16, avpkt->size - 16, 0);
        break;
    default:
        avpriv_request_sample(avctx, "Frame header %X", AV_RB32(src));
        return AVERROR_PATCHWELCOME;
    }

    if (ret)
        return ret;

    pic->pict_type = AV_PICTURE_TYPE_I;
    pic->key_frame = 1;
    *got_frame = 1;

    return avpkt->size;
}