Function ff_mjpeg_decode_sof

libavcodec/mjpegdec.c:197–372

}

int ff_mjpeg_decode_sof(MJpegDecodeContext *s)
{
    int len, nb_components, i, width, height, pix_fmt_id;

    /* XXX: verify len field validity */
    len = get_bits(&s->gb, 16);
    s->bits= get_bits(&s->gb, 8);

    if(s->pegasus_rct) s->bits=9;
    if(s->bits==9 && !s->pegasus_rct) s->rct=1;    //FIXME ugly

    if (s->bits != 8 && !s->lossless){
        av_log(s->avctx, AV_LOG_ERROR, "only 8 bits/component accepted\n");
        return -1;
    }

    height = get_bits(&s->gb, 16);
    width = get_bits(&s->gb, 16);

    //HACK for odd_height.mov
    if(s->interlaced && s->width == width && s->height == height + 1)
        height= s->height;

    av_log(s->avctx, AV_LOG_DEBUG, "sof0: picture: %dx%d\n", width, height);
    if(avcodec_check_dimensions(s->avctx, width, height))
        return -1;

    nb_components = get_bits(&s->gb, 8);
    if (nb_components <= 0 ||
        nb_components > MAX_COMPONENTS)
        return -1;
    if (s->ls && !(s->bits <= 8 || nb_components == 1)){
        av_log(s->avctx, AV_LOG_ERROR, "only <= 8 bits/component or 16-bit gray accepted for JPEG-LS\n");
        return -1;
    }
    s->nb_components = nb_components;
    s->h_max = 1;
    s->v_max = 1;
    for(i=0;i<nb_components;i++) {
        /* component id */
        s->component_id[i] = get_bits(&s->gb, 8) - 1;
        s->h_count[i] = get_bits(&s->gb, 4);
        s->v_count[i] = get_bits(&s->gb, 4);
        /* compute hmax and vmax (only used in interleaved case) */
        if (s->h_count[i] > s->h_max)
            s->h_max = s->h_count[i];
        if (s->v_count[i] > s->v_max)
            s->v_max = s->v_count[i];
        s->quant_index[i] = get_bits(&s->gb, 8);
        if (s->quant_index[i] >= 4)
            return -1;
        av_log(s->avctx, AV_LOG_DEBUG, "component %d %d:%d id: %d quant:%d\n", i, s->h_count[i],
               s->v_count[i], s->component_id[i], s->quant_index[i]);
    }

    if(s->ls && (s->h_max > 1 || s->v_max > 1)) {
        av_log(s->avctx, AV_LOG_ERROR, "Subsampling in JPEG-LS is not supported.\n");
        return -1;