static int cmv_process_header(CmvContext *s, const uint8_t *buf, const uint8_t *buf_end)

{

    int pal_start, pal_count, i, ret;



    if(buf_end - buf < 16) {

        av_log(s->avctx, AV_LOG_WARNING, "truncated header\n");

        return AVERROR_INVALIDDATA;

    }



    s->width  = AV_RL16(&buf[4]);

    s->height = AV_RL16(&buf[6]);



    ret = ff_set_dimensions(s->avctx, s->width, s->height);

    if (ret < 0)

        return ret;



    s->avctx->time_base.num = 1;

    s->avctx->time_base.den = AV_RL16(&buf[10]);



    pal_start = AV_RL16(&buf[12]);

    pal_count = AV_RL16(&buf[14]);



    buf += 16;

    for (i=pal_start; i<pal_start+pal_count && i<AVPALETTE_COUNT && buf_end - buf >= 3; i++) {

        s->palette[i] = AV_RB24(buf);

        buf += 3;

    }



    return 0;

}
