static int cdxl_decode_frame(AVCodecContext *avctx, void *data,

                             int *got_frame, AVPacket *pkt)

{

    CDXLVideoContext *c = avctx->priv_data;

    AVFrame * const p = data;

    int ret, w, h, encoding, aligned_width, buf_size = pkt->size;

    const uint8_t *buf = pkt->data;



    if (buf_size < 32)

        return AVERROR_INVALIDDATA;

    encoding        = buf[1] & 7;

    c->format       = buf[1] & 0xE0;

    w               = AV_RB16(&buf[14]);

    h               = AV_RB16(&buf[16]);

    c->bpp          = buf[19];

    c->palette_size = AV_RB16(&buf[20]);

    c->palette      = buf + 32;

    c->video        = c->palette + c->palette_size;

    c->video_size   = buf_size - c->palette_size - 32;



    if (c->palette_size > 512)

        return AVERROR_INVALIDDATA;

    if (buf_size < c->palette_size + 32)

        return AVERROR_INVALIDDATA;

    if (c->bpp < 1)

        return AVERROR_INVALIDDATA;

    if (c->format != BIT_PLANAR && c->format != BIT_LINE && c->format != CHUNKY) {

        avpriv_request_sample(avctx, "Pixel format 0x%0x", c->format);

        return AVERROR_PATCHWELCOME;

    }



    if ((ret = ff_set_dimensions(avctx, w, h)) < 0)

        return ret;



    if (c->format == CHUNKY)

        aligned_width = avctx->width;

    else

        aligned_width = FFALIGN(c->avctx->width, 16);

    c->padded_bits  = aligned_width - c->avctx->width;

    if (c->video_size < aligned_width * avctx->height * c->bpp / 8)

        return AVERROR_INVALIDDATA;

    if (!encoding && c->palette_size && c->bpp <= 8) {

        avctx->pix_fmt = AV_PIX_FMT_PAL8;

    } else if (encoding == 1 && (c->bpp == 6 || c->bpp == 8)) {

        if (c->palette_size != (1 << (c->bpp - 1)))

            return AVERROR_INVALIDDATA;

        avctx->pix_fmt = AV_PIX_FMT_BGR24;

    } else if (!encoding && c->bpp == 24 && c->format == CHUNKY &&

               !c->palette_size) {

        avctx->pix_fmt = AV_PIX_FMT_RGB24;

    } else {

        avpriv_request_sample(avctx, "Encoding %d, bpp %d and format 0x%x",

                              encoding, c->bpp, c->format);

        return AVERROR_PATCHWELCOME;

    }



    if ((ret = ff_get_buffer(avctx, p, 0)) < 0)

        return ret;

    p->pict_type = AV_PICTURE_TYPE_I;



    if (encoding) {

        av_fast_padded_malloc(&c->new_video, &c->new_video_size,

                              h * w + AV_INPUT_BUFFER_PADDING_SIZE);

        if (!c->new_video)

            return AVERROR(ENOMEM);

        if (c->bpp == 8)

            cdxl_decode_ham8(c, p);

        else

            cdxl_decode_ham6(c, p);

    } else if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {

        cdxl_decode_rgb(c, p);

    } else {

        cdxl_decode_raw(c, p);

    }

    *got_frame = 1;



    return buf_size;

}
